Powered by Deep Web Technologies
Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Atmospheric Environment 39 (2005) 28292838 Diurnal and seasonal cycles of ozone precursors observed from  

E-Print Network [OSTI]

characteristics. Ethane and propane, largely originated from leakage of natural gas or liquefied petroleum gases) and nitrogen oxides (NO+NO2 ¼ NOx), ozone is photochemically pro- duced and can accumulate to hazardous levels

Wingenter, Oliver W.

2

NOx Emission Reduction and its Effects on Ozone during the 2008 Olympic Games  

SciTech Connect (OSTI)

We applied a daily-assimilated inversion method to estimate NOx (NO+NO2) emissions for June-September 2007 and 2008 on the basis of the Aura Ozone Monitoring Instrument (OMI) observations of nitrogen dioxide (NO2) and model simulations using the Regional chEmistry and trAnsport Model (REAM). Over urban Beijing, rural Beijing, and the Huabei Plain, OMI column NO2 reductions are approximately 45%, 33%, and 14%, respectively, while the corresponding anthropogenic NOx emission reductions are only 28%, 24%, and 6%, during the full emission control period (July 20 – Sep 20, 2008). The emission reduction began in early July and was in full force by July 20, corresponding to the scheduled implementation of emission controls over Beijing. The emissions did not appear to recover after the emission control period. Meteorological change from summer 2007 to 2008 is the main factor contributing to the column NO2 decreases not accounted for by the emission reduction. Model simulations suggest that the effect of emission reduction on ozone concentrations over Beijing is relatively minor using a standard VOC emission inventory in China. With an adjustment of the model emissions to reflect in situ observations of VOCs in Beijing, the model simulation suggests a larger effect of the emission reduction.

Yang, Qing; Wang, Yuhang; Zhao, Chun; Liu, Zhen; Gustafson, William I.; Shao, Min

2011-07-15T23:59:59.000Z

3

Radiative forcing from aircraft NOx emissions: Mechanisms and seasonal dependence  

E-Print Network [OSTI]

dependence. The long-term globally integrated annual mean net forcing calculated here is approximately zero, related to the annual cycle in photochemistry; the O3 radiative forcing calculations also have a seasonal, although earlier work suggests a small net positive forcing. The model design (e.g., upper tropospheric

4

A cost-effectiveness analysis of alternative ozone control strategies : flexible nitrogen oxide (NOx) abatement from power plants in the eastern United States  

E-Print Network [OSTI]

Ozone formation is a complex, non-linear process that depends on the atmospheric concentrations of its precursors, nitrogen oxide (NOx) and Volatile Organic Compounds (VOC), as well as on temperature and the available ...

Sun, Lin, S.M. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

5

A Cost-Effectiveness Analysis of Alternative Ozone Control Strategies: Flexible Nitrogen Oxide (NOx) Abatement  

E-Print Network [OSTI]

) Abatement from Power Plants in the Eastern United States by Lin Sun B.S. Chemistry, Peking University, China: Flexible Nitrogen Oxide (NOx) Abatement from Power Plants in the Eastern United States by Lin Sun Submitted

6

Observation of NOx enhancement and ozone depletion in the Northern and Southern  

E-Print Network [OSTI]

Clarmann, G. P. Stiller, M. Ho¨pfner, S. Kellmann, and H. Fischer Institut fu¨r Meteorologie und Clarmann, G. P. Stiller, M. Ho¨pfner, S. Kellmann, H. Fischer, and C. H. Jackman (2005), Observation of NOx

Jackman, Charles H.

7

Observations of the Temperature Dependent Response of Ozone to NOx Reductions in an Urban Plume  

SciTech Connect (OSTI)

Observations of NO{sub x} in the Sacramento, CA region show that mixing ratios decreased by 30% between 2001 and 2008. Here we use an observation-based method to quantify net ozone production rates in the outflow from the Sacramento metropolitan region and examine the O{sub 3} decrease resulting from reductions in NO{sub x} emissions. This observational method does not rely on assumptions about detailed chemistry of ozone production, rather it is an independent means to verify and test these assumptions. We use an instantaneous steady-state model as well as a detailed 1-D plume model to aid in interpretation of the ozone production inferred from observations. In agreement with the models, the observations show that early in the plume, the NO{sub x} dependence for O{sub x} (O{sub x} = O{sub 3}+NO{sub 2}) production is strongly coupled with temperature, suggesting that temperature dependent biogenic VOC emissions can drive O{sub x} production between NO{sub x}-limited and NO{sub x}-suppressed regimes. As a result, NO{sub x} reductions were found to be most effective at higher temperatures over the 7 year period. We show that violations of the California 1-hour O{sub 3} standard (90 ppb) in the region have been decreasing linearly with decreases in NO{sub x} (at a given temperature) and predict that reductions of NO{sub x} concentrations (and presumably emissions) by an additional 30% (relative to 2007 levels) will eliminate violations of the state 1 hour standard in the region. If current trends continue, a 30% decrease in NO{sub x} is expected by 2012, and an end to violations of the 1 hour standard in the Sacramento region appears to be imminent.

LaFranchi, B W; Goldstein, A H; Cohen, R C

2011-01-25T23:59:59.000Z

8

Reduction of NOx by plasma-assisted methods , F. Leipold1  

E-Print Network [OSTI]

acid rain and ozone production when it is released into the air. Reduction of NOx in the exhaust gas

9

Weekday and Weekend Air Pollutant Levels in Ozone Problem Areas...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Ambient Ozone Formation as a Function of NOx Reductions Summary and Implications for Air Quality Impacts DOE's Studies of WeekdayWeekend Ozone Pollution in Southern...

10

NO[x] production by lightning in the continental U.S. and its impacts on tropospheric chemistry  

E-Print Network [OSTI]

Nitrogen oxides (NOx) play an important role in atmospheric chemistry. High tropospheric NOx concentrations increase ozone (O?) levels via photochemical cycling of NO to NO?, whereas low NOx concentrations result in the catalytic destruction of O?...

Bond, Donald William

2001-01-01T23:59:59.000Z

11

Industry-Utility Collaborative Efforts to Address Environmental Concerns- Dispatching for Localized NOx Reduction  

E-Print Network [OSTI]

these objectives. The approach involves dispatching NOx-producing equipment (e.g., boilers and gas turbines) to achieve minimum NOx production during ozone alert periods and purchasing supplemental power under a special tariff to replace any loss in self...

Hamilton, D. E.; Helmick, R. W.; Lambert, W. J.

12

Time and location differentiated NOX control in competitive electricity markets using cap-and-trade mechanisms  

E-Print Network [OSTI]

Due to variations in weather and atmospheric chemistry, the timing and location of nitrogen oxide (NOX) reductions determine their effectiveness in reducing ground-level ozone, which adversely impacts human health. Electric ...

Martin, Katherine C.

2007-01-01T23:59:59.000Z

13

Low NOx combustion  

SciTech Connect (OSTI)

Combustion of hydrocarbon liquids and solids is achieved with less formation of NOx by feeding a small amount of oxygen into the fuel stream.

Kobayashi; Hisashi (Putnam Valley, NY), Bool, III; Lawrence E. (Aurora, NY)

2007-06-05T23:59:59.000Z

14

Low NOx combustion  

SciTech Connect (OSTI)

Combustion of hydrocarbon liquids and solids is achieved with less formation of NOx by feeding a small amount of oxygen into the fuel stream.

Kobayashi, Hisashi (Putnam Valley, NY); Bool, III, Lawrence E. (Aurora, NY)

2008-10-21T23:59:59.000Z

15

SCR Technologies for NOx Reduction  

Broader source: Energy.gov (indexed) [DOE]

SCR Technology for NOx Reduction Outline Necessity of NOx Exhaust Gas Aftertreatment Air-assisted Dosing Systems (HD applications) Field experience with DENOXTRONIC for MDHD...

16

Durability of NOx Absorbers  

Broader source: Energy.gov (indexed) [DOE]

Exhaust Flow Through Catalyst During Regen From Engine NOx Absorber Oxidation Catalyst Reactor 1 in Sorption Mode Reactor 2 in Regen Mode Open Valve Closed Valve Diesel Fuel In...

17

CLEERS Activities: Diesel Soot Filter Characterization & NOx...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Activities: Diesel Soot Filter Characterization & NOx Control Fundamentals CLEERS Activities: Diesel Soot Filter Characterization & NOx Control Fundamentals 2009 DOE Hydrogen...

18

Reductions in ozone concentrations due to controls on variability in industrial flare emissions in Houston, Texas  

E-Print Network [OSTI]

High concentrations of ozone in the Houston/Galveston area are associated with industrial plumes of highly reactive hydrocarbons, mixed with NOx. The emissions leading to these plumes can have significant temporal variability, ...

Nam, Junsang

2007-01-01T23:59:59.000Z

19

The effect of variability in industrial emissions on ozone formation in Houston, Texas  

E-Print Network [OSTI]

Ambient observations have indicated that high concentrations of ozone observed in the Houston/Galveston area are associated with plumes of highly reactive hydrocarbons, mixed with NOx, from industrial facilities. Ambient ...

Webster, Mort David

2007-01-01T23:59:59.000Z

20

Flexible NOx Abatement from Power  

E-Print Network [OSTI]

Flexible NOx Abatement from Power Plants in the Eastern United States* Lin Sun, Mort Webster, Gary: globalchange@mit.edu Website: http://globalchange.mit.edu/ #12;Flexible NOx Abatement from Power Plants

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

6, 93159349, 2006 Seasonality of O3  

E-Print Network [OSTI]

(nitrogen oxide (NO) + nitrogen dioxide (NO2)=NOx) oxidized to NOz (total reac- tive nitrogen (NOy (EN), defined as the net number of ozone molecules produced per molecule of nitrogen ox- ides.s.l. This dataset is a unique long-term data series of nitrogen levels in the free troposphere over Central Europe

Paris-Sud XI, Université de

22

Lean NOx Catalysis Research and Development  

Broader source: Energy.gov (indexed) [DOE]

4 Lean-NOx Catalyst Materials T NOx active T NOx selective Noble metals (ex. PtAl 2 O 3 ) highly active, stable narrow temperature range, poorly selective (N 2 O) ...

23

Measurement and Characterization of NOx Adsorber Regeneration...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Combustion with Lean-NOx Trap Yields Progress Toward Targets of Efficient NOx Control for Diesels Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects...

24

Proceedings: 2000 NOx Controls Workshop  

SciTech Connect (OSTI)

The 2000 EPRI workshop on nitrogen oxide (NOx) controls for utility boilers provided a medium for member utilities to augment their knowledge of recent operating experience and developments on NOx control technologies. The event focused on improving methods of compliance with emission regulations mandated by the Clean Air Act Amendments (CAAA) of 1990 without jeopardizing efficiency and plant performance.

None

2001-04-01T23:59:59.000Z

25

NOx Adsorber (Lean NOx Trap) Fundamentals (Agreement #10049 ...  

Broader source: Energy.gov (indexed) [DOE]

on catalyst structure changes * Roles of catalyst promoters (e.g., J.R. Theis, et al., "The effect of Ceria Content on the Performance of a NOx Trap", SAE 2003-01-1160) - On...

26

Reducing the contribution of the power sector to ground-level ozone pollution : an assessment of time-differentiated pricing of nitrogen oxide emissions  

E-Print Network [OSTI]

Nitrogen oxide (NOx) is a prevalent air pollutant across the United States and a requisite precursor for tropospheric (ground-level) ozone formation. Both pollutants significantly impact human health and welfare, so National ...

Craig, Michael T. (Michael Timothy)

2014-01-01T23:59:59.000Z

27

NOx Control for Utility Boiler OTR Compliance  

SciTech Connect (OSTI)

Under sponsorship of the Department of Energy's National Energy Technology Laboratory (NETL), the Babcock and Wilcox Company (B and W), and Fuel Tech teamed together to investigate an integrated solution for NO{sub x} control. The system is comprised of B and W's DRB-4Z{trademark} ultra low-NO{sub x} pulverized coal (PC) burner technology and Fuel Tech's NOxOUT{reg_sign}, a urea-based selective non-catalytic reduction (SNCR) technology. Development of the low-NO{sub x} burner technology has been a focus in B and W's combustion program. The DRB-4Z{trademark} burner is B and W's newest low-NO{sub x} burner capable of achieving very low NO{sub x}. The burner is designed to reduce NO{sub x} by controlled mixing of the fuel and air. Based on data from several 500 to 600 MWe boilers firing PRB coal, NOx emissions levels of 0.15 to 0.20 lb/ 106 Btu have been achieved from the DRB-4Z{trademark} burners in combination with overfire air ports. Although NOx emissions from the DRB-4Z{trademark} burner are nearing the Ozone Transport Rule (OTR) level of 0.15 lb NO{sub x}/106 Btu, the utility boiler owners can still benefit from the addition of an SNCR and/or SCR system in order to comply with the stringent NO{sub x} emission levels facing them. Large-scale testing is planned in B and W's 100-million Btu/hr Clean Environment Development Facility (CEDF) that simulates the conditions of large coal-fired utility boilers. The objective of the project is to achieve a NO{sub x} level below 0.15 lb/106 Btu (with ammonia slip of less than 5 ppm) in the CEDF using PRB coal and B and W's DRB-4Z{trademark} low-NO{sub x} pulverized coal (PC) burner in combination with dual zone overfire air ports and Fuel Tech's NO{sub x}OUT{reg_sign}. During this period B and W prepared and submitted the project management plan and hazardous substance plan to DOE. The negotiation of a subcontract for Fuel Tech has been started.

Hamid Farzan

2003-12-31T23:59:59.000Z

28

Plant-Wide NOx Reduction Strategies  

E-Print Network [OSTI]

and the public's awareness increased, industry began looking for new strategies to curb NOx emissions. The strategies for reducing NOx are discussed next. Table 1 shows a summary of common NOx control technologies [1]. Table 1 NOx reduction technologies... for NOx Control, in Industrial Combustion Technologies, ed. by M.A. Lukasiewicz, American Society of Metals, Warren, PA, pp. 345-350, 1986. 7. A. Garg, Trimming NOx, Chem Eng., Vol. 99, No. 11, pp. 122-124, 1992. 8. C.E. Baukal, Industrial Combustion...

Baukal, C.; Waibel, D.; Webster, T.

2006-01-01T23:59:59.000Z

29

NOx CONTROL OPTIONS AND INTEGRATION FOR US COAL FIRED BOILERS  

SciTech Connect (OSTI)

This is the fifth Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for firing US coals. The Electric Power Research Institute (EPRI) is providing cofunding for this program. This program contains multiple tasks and good progress is being made on all fronts. Field tests for NOx reduction in a cyclone fired utility boiler due to using Rich Reagent Injection (RRI) have been started. CFD modeling studies have been started to evaluate the use of RRI for NOx reduction in a corner fired utility boiler using pulverized coal. Field tests of a corrosion monitor to measure waterwall wastage in a utility boiler have been completed. Computational studies to evaluate a soot model within a boiler simulation program are continuing. Research to evaluate SCR catalyst performance has started. A literature survey was completed. Experiments have been outlined and two flow reactor systems have been designed and are under construction. Commercial catalyst vendors have been contacted about supplying catalyst samples. Several sets of new experiments have been performed to investigate ammonia removal processes and mechanisms for fly ash. Work has focused on a promising class of processes in which ammonia is destroyed by strong oxidizing agents at ambient temperature during semi-dry processing (the use of moisture amounts less than 5 wt-%). Both ozone and an ozone/peroxide combination have been used to treat both basic and acidic ammonia-laden ashes.

Mike Bockelie; Marc Cremer; Kevin Davis; Connie Senior; Bob Hurt; Eric Eddings; Larry Baxter

2001-10-10T23:59:59.000Z

30

NOx adsorber and method of regenerating same  

DOE Patents [OSTI]

New technologies, such as NOx adsorber catalytic converters, are being used to meet increasingly stringent regulations on undesirable emissions, including NOx emissions. NOx adsorbers must be periodically regenerated, which requires an increased fuel consumption. The present disclosure includes a method of regenerating a NOx adsorber within a NOx adsorber catalytic converter. At least one sensor positioned downstream from the NOx adsorber senses, in the downstream exhaust, at least one of NOx, nitrous oxide and ammonia concentrations a plurality of times during a regeneration phase. The sensor is in communication with an electronic control module that includes a regeneration monitoring algorithm operable to end the regeneration phase when a time rate of change of the at least one of NOx, nitrous oxide and ammonia concentrations is after an expected plateau region begins.

Endicott, Dennis L. (Peoria, IL); Verkiel, Maarten (Metamora, IL); Driscoll, James J. (Dunlap, IL)

2007-01-30T23:59:59.000Z

31

Control of NOx by combustion process modifications  

E-Print Network [OSTI]

A theoretical and experimental study was carried out to determine lower bounds of NOx emission from staged combustion of a 0.7%N #6 fuel oil. Thermodynamic and chemical kinetic calculations have shown minimum NOx emissions ...

Ber?, J. M.

1981-01-01T23:59:59.000Z

32

NOx Reduction through Efficiency Gain  

E-Print Network [OSTI]

Approach, Fifth Edition, McGraw-Hill, June 2005 Kuo, K. K., Principles of Combustion 2 nd Edition, Wiley, January 2005 Erickson, K. T., Plant-Wide Process Control, 1 st Edition, Wiley, April 2005 ESL-IE-07-05-42 Proceedings... putting financial stress on steam generation plants to adhere to environmental regulations we provide an incentive to do so. The simplicity and elegance of the CompuNOx system minimizes system changes. Control related changes consist...

Benz, R.; Thompson, R.; Staedter, M.

2007-01-01T23:59:59.000Z

33

Reducing NOx in Fired Heaters and Boilers  

E-Print Network [OSTI]

-6, 2000 Reducing NOx in Fired Heaters Air Pollution Control and Boilers Keeping the environment clean Presented by Ashutosh Garg Furnace Improvements Low cost solutions for fired heaters Trace compounds ? Nitric oxides ? Carbon monoxide ? Sulfur... it is essential to estimate accurately baseline NOx emissions. ? This will establish each units current compliance status. ? Emissions ? Current excess air level ? Carbon monoxide ? Combustibles ? NOx corrected to 3% 02 314 ESL-IE-00-04-46 Proceedings...

Garg, A.

34

NOx reduction in gas turbine combustors  

E-Print Network [OSTI]

NOx REDUCTION IN GAS TURBINE COMBUSTORS A Thesis by Nak Won Sung Submitted to the Graduate College of Texas A&M University in partial fullfillment of the requirement for the degree of MASTER OF SCIENCE August 1976 Major Subject: Mechanical... Engineering NOx REDUCTION IN GAS TURBINE COMBUSTORS A Thesis by Nak Won Sung Approved as to style and content by: (Chairman of Committe (Head of Department) (Member) August 1976 "40308 (Member) 1 1. 1 ABSTRACT NOx Reduction in Gas Turbine...

Sung, Nak Won

1976-01-01T23:59:59.000Z

35

Plasma Assisted Catalysis System for NOx Reduction  

Broader source: Energy.gov (indexed) [DOE]

SCHEMATIC Catalyst for NOx Reduction Plasma Region Exhaust Flow Solid State Pulser Power Modulator Motor Generator ENGINE Air Diesel Fuel Converter NO X + HC(Diesel) NO 2 +...

36

Monolithic Metal Oxide based Composite Nanowire Lean NOx Emission...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Monolithic Metal Oxide based Composite Nanowire Lean NOx Emission Control Catalysts Monolithic Metal Oxide based Composite Nanowire Lean NOx Emission Control Catalysts Presents...

37

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Broader source: Energy.gov (indexed) [DOE]

Three-Dimensional Composite Nanostructures for Lean NOx Emission Control Three-Dimensional Composite Nanostructures for Lean NOx Emission Control 2010 DOE Vehicle Technologies and...

38

Retrofit Diesel Emissions Control System Providing 50% NOxControl...  

Broader source: Energy.gov (indexed) [DOE]

Retrofit Diesel Emissions Control System Providing 50% NOxControl Retrofit Diesel Emissions Control System Providing 50% NOxControl 2005 Diesel Engine Emissions Reduction (DEER)...

39

Development on simultaneous reduction system of NOx and PM from...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

More Documents & Publications An Improvement of Diesel PM and NOx Reduction System An Improvement of Diesel PM and NOx Reduction System EPA Mobile Source Rule Update...

40

Passive Catalytic Approach to Low Temperature NOx Emission Abatement...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Catalytic Approach to Low Temperature NOx Emission Abatement Passive Catalytic Approach to Low Temperature NOx Emission Abatement Numerically evaluated and optimized proposed...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Rapid Aging Protocols for Diesel Aftertreatment Devices: NOx...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Rapid Aging Protocols for Diesel Aftertreatment Devices: NOx Abatement Catalysts Rapid Aging Protocols for Diesel Aftertreatment Devices: NOx Abatement Catalysts Poster...

42

Measurement and Characterization of Lean NOx Adsorber Regeneration...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

mode Measurement and Characterization of Lean NOx Adsorber Regeneration and Desulfation and Controlling NOx from Multi-mode 2009 DOE Hydrogen Program and Vehicle Technologies...

43

NOx Abatement Research and Development CRADA with Navistar Incorporate...  

Broader source: Energy.gov (indexed) [DOE]

NOx Abatement Research and Development CRADA with Navistar Incorporated NOx Abatement Research and Development CRADA with Navistar Incorporated 2009 DOE Hydrogen Program and...

44

Functionality of Commercial NOx Storage-Reduction Catalysts and...  

Broader source: Energy.gov (indexed) [DOE]

Catalysis Research: Fundamental SulfationDesulfation Studies of Lean NOx Traps CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines...

45

Selective reduction of NOx in oxygen rich environments with plasma...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

reduction of NOx in oxygen rich environments with plasma-assisted catalysis: Catalyst development and mechanistic studies Selective reduction of NOx in oxygen rich environments...

46

Virtual Oxygen Sensor for Innovative NOx and PM Emission Control...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Virtual Oxygen Sensor for Innovative NOx and PM Emission Control Technologies Virtual Oxygen Sensor for Innovative NOx and PM Emission Control Technologies A virtual O2 sensor for...

47

NOx Adsorbers for Heavy Duty Truck Engines - Testing and Simulation...  

Broader source: Energy.gov (indexed) [DOE]

NOx Adsorbers for Heavy Duty Truck Engines - Testing and Simulation NOx Adsorbers for Heavy Duty Truck Engines - Testing and Simulation This report provides the results of an...

48

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations H2-Assisted NOx Traps: Test Cell Results Vehicle Installations 2003 DEER Conference Presentation: ArvinMeritor...

49

Dynamometer Evaluation of Plasma-Catalyst for Diesel NOx Reduction...  

Broader source: Energy.gov (indexed) [DOE]

Dynamometer Evaluation of Plasma-Catalyst for Diesel NOx Reduction Dynamometer Evaluation of Plasma-Catalyst for Diesel NOx Reduction 2003 DEER Conference Presentation: Ford Motor...

50

Ammonia-Free NOx Control System  

SciTech Connect (OSTI)

Research is being conducted under United States Department of Energy (DOE) Contract DEFC26-03NT41865 to develop a new technology to achieve very low levels of NOx emissions from pulverized coal fired boiler systems by employing a novel system level integration between the PC combustion process and the catalytic NOx reduction with CO present in the combustion flue gas. The combustor design and operating conditions will be optimized to achieve atypical flue gas conditions. This approach will not only suppress NOx generation during combustion but also further reduce NOx over a downstream catalytic reactor that does not require addition of an external reductant, such as ammonia. This report describes the work performed during the January 1 to March 31, 2004 time period.

S. Wu; Z. Fan; R. Herman

2004-03-31T23:59:59.000Z

51

Ammonia-Free NOx Control System  

SciTech Connect (OSTI)

Research is being conducted under United States Department of Energy (DOE) Contract DEFC26-03NT41865 to develop a new technology to achieve very low levels of NOx emissions from pulverized coal fired boiler systems by employing a novel system level integration between the PC combustion process and the catalytic NOx reduction with CO present in the combustion flue gas. The combustor design and operating conditions will be optimized to achieve atypical flue gas conditions. This approach will not only suppress NOx generation during combustion but also further reduce NOx over a downstream catalytic reactor that does not require addition of an external reductant, such as ammonia. This report describes the work performed during the October 1 to December 31, 2003 time period.

S. Wu

2003-12-31T23:59:59.000Z

52

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

Conventional wisdom says adding oxygen to a combustion system enhances product throughput, system efficiency, and, unless special care is taken, increases NOx emissions. This increase in NOx emissions is typically due to elevated flame temperatures associated with oxygen use leading to added thermal NOx formation. Innovative low flame temperature oxy-fuel burner designs have been developed and commercialized to minimize both thermal and fuel NOx formation for gas and oil fired industrial furnaces. To be effective these systems require close to 100% oxy-fuel combustion and the cost of oxygen is paid for by fuel savings and other benefits. For applications to coal-fired utility boilers at the current cost of oxygen, however, it is not economically feasible to use 100% oxygen for NOx control. In spite of this conventional wisdom, Praxair and its team members, in partnership with the US Department of Energy National Energy Technology Laboratory, have developed a novel way to use oxygen to reduce NOx emissions without resorting to complete oxy-fuel conversion. In this concept oxygen is added to the combustion process to enhance operation of a low NOx combustion system. Only a small fraction of combustion air is replaced with oxygen in the process. By selectively adding oxygen to a low NOx combustion system it is possible to reduce NOx emissions from nitrogen-containing fuels, including pulverized coal, while improving combustion characteristics such as unburned carbon. A combination of experimental work and modeling was used to define how well oxygen enhanced combustion could reduce NOx emissions. The results of this work suggest that small amounts of oxygen replacement can reduce the NOx emissions as compared to the air-alone system. NOx emissions significantly below 0.15 lbs/MMBtu were measured. Oxygen addition was also shown to reduce carbon in ash. Comparison of the costs of using oxygen for NOx control against competing technologies, such as SCR, show that this concept offers substantial savings over SCR and is an economically attractive alternative to purchasing NOx credits or installing other conventional technologies. In conjunction with the development of oxygen based low NOx technology, Praxair also worked on developing the economically enhancing oxygen transport membrane (OTM) technology which is ideally suited for integration with combustion systems to achieve further significant cost reductions and efficiency improvements. This OTM oxygen production technology is based on ceramic mixed conductor membranes that operate at high temperatures and can be operated in a pressure driven mode to separate oxygen with infinite selectivity and high flux. An OTM material was selected and characterized. OTM elements were successfully fabricated. A single tube OTM reactor was designed and assembled. Testing of dense OTM elements was conducted with promising oxygen flux results of 100% of target flux. However, based on current natural gas prices and stand-alone air separation processes, ceramic membranes do not offer an economic advantage for this application. Under a different DOE-NETL Cooperative Agreement, Praxair is continuing to develop oxygen transport membranes for the Advanced Boiler where the economics appear more attractive.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2004-04-01T23:59:59.000Z

53

Enhanced Combustion Low NOx Pulverized Coal Burner  

SciTech Connect (OSTI)

For more than two decades, ALSTOM Power Inc. (ALSTOM) has developed a range of low cost, in-furnace technologies for NOx emissions control for the domestic U.S. pulverized coal fired boiler market. This includes ALSTOM's internally developed TFS 2000 firing system, and various enhancements to it developed in concert with the U.S. Department of Energy (DOE). As of 2004, more than 200 units representing approximately 75,000 MWe of domestic coal fired capacity have been retrofit with ALSTOM low NOx technology. Best of class emissions range from 0.18 lb/MMBtu for bituminous coals to 0.10 lb/MMBtu for subbituminous coals, with typical levels at 0.24 lb/MMBtu and 0.13 lb/MMBtu, respectively. Despite these gains, NOx emissions limits in the U.S. continue to ratchet down for new and existing (retrofit) boiler equipment. If enacted, proposed Clear Skies legislation will, by 2008, require an average, effective, domestic NOx emissions rate of 0.16 lb/MMBtu, which number will be reduced to 0.13 lb/MMBtu by 2018. Such levels represent a 60% and 67% reduction, respectively, from the effective 2000 level of 0.40 lb/MMBtu. Low cost solutions to meet such regulations, and in particular those that can avoid the need for a costly selective catalytic reduction system (SCR), provide a strong incentive to continue to improve low NOx firing system technology to meet current and anticipated NOx control regulations. In light of these needs, ALSTOM, in cooperation with the DOE, is developing an enhanced combustion, low NOx pulverized coal burner which, when integrated with ALSTOM's state-of-the-art, globally air staged low NOx firing systems, will provide a means to achieve less than 0.15 lb/MMBtu NOx at less than 3/4 the cost of an SCR with low to no impact on balance of plant issues when firing a high volatile bituminous coal. Such coals can be more economic to fire than subbituminous or Powder River Basin (PRB) coals, but are more problematic from a NOx control standpoint as existing firing system technologies do not provide a means to meet current or anticipated regulations absent the use of an SCR. The DOE/ALSTOM program performed large pilot scale combustion testing in ALSTOM's Industrial Scale Burner Facility (ISBF) at its U.S. Power Plant Laboratories facility in Windsor, Connecticut. During this work, the near-field combustion environment was optimized to maximize NOx reduction while minimizing the impact on unburned carbon in ash, slagging and fouling, corrosion, and flame stability/turn-down under globally reducing conditions. Initially, ALSTOM utilized computational fluid dynamic modeling to evaluate a series of burner and/or near field stoichiometry controls in order to screen promising design concepts in advance of the large pilot scale testing. The third and final test, to be executed, will utilize several variants of the best nozzle tip configuration and compare performance with 3 different coals. The fuels to be tested will cover a wide range of coals commonly fired at US utilities. The completion of this work will provide sufficient data to allow ALSTOM to design, construct, and demonstrate a commercial version of an enhanced combustion low NOx pulverized coal burner. A preliminary cost/performance analysis of the developed enhanced combustion low NOx burner applied to ALSTOM's state-of-the-art TFS 2000 firing system was performed to show that the burner enhancements is a cost effective means to reduce NOx.

Ray Chamberland; Aku Raino; David Towle

2006-09-30T23:59:59.000Z

54

Tax Credits, Rebates & Savings | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Govt, Systems Integrator, Transportation, Tribal Government, Utility Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season Trading...

55

Tax Credits, Rebates & Savings | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season Trading Program (Connecticut) These regulations may apply to fossil-fuel fired...

56

Tax Credits, Rebates & Savings | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Utility Tax Credits, Rebates & Savings Tax Credits, Rebates & Savings Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season...

57

Tax Credits, Rebates & Savings | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Cooperative Tax Credits, Rebates & Savings Tax Credits, Rebates & Savings Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season...

58

Tax Credits, Rebates & Savings | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Govt Tax Credits, Rebates & Savings Tax Credits, Rebates & Savings Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season...

59

Tax Credits, Rebates & Savings | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Govt, Systems Integrator, Transportation, Tribal Government, Utility Abatement of Air Pollution: The Clean Air Interstate Rule (CAIR) Nitrogen Oxides (Nox) Ozone Season...

60

A Fast Start-up On-Board Fuel Reformer for NOx Adsorber Regeneration...  

Broader source: Energy.gov (indexed) [DOE]

leg) 8 2004 DEER Conference September 2, 2004 Experimental Setup NOx Trap Engine Reformer Diesel Air Power NOx Trap NOx Trap Engine NOx Trap Diesel Diesel Fuel Reformer Setup...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Cummins/ORNL-FEERC CRADA: NOx Control & Measurement Technology...  

Broader source: Energy.gov (indexed) [DOE]

CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel...

62

Cutting NOx from Diesel Engines with Membrane-Generated Nitrogen...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Cutting NOx from Diesel Engines with Membrane-Generated Nitrogen-Enriched Air Cutting NOx from Diesel Engines with Membrane-Generated Nitrogen-Enriched Air 2005 Diesel Engine...

63

Enhanced Combustion Low NOx Pulverized Coal Burner  

SciTech Connect (OSTI)

For more than two decades, Alstom Power Inc. (Alstom) has developed a range of low cost, infurnace technologies for NOx emissions control for the domestic U.S. pulverized coal fired boiler market. This includes Alstom's internally developed TFS 2000{trademark} firing system, and various enhancements to it developed in concert with the U.S. Department of Energy. As of the date of this report, more than 270 units representing approximately 80,000 MWe of domestic coal fired capacity have been retrofit with Alstom low NOx technology. Best of class emissions range from 0.18 lb/MMBtu for bituminous coal to 0.10 lb/MMBtu for subbituminous coal, with typical levels at 0.24 lb/MMBtu and 0.13 lb/MMBtu, respectively. Despite these gains, NOx emissions limits in the U.S. continue to ratchet down for new and existing boiler equipment. On March 10, 2005, the Environmental Protection Agency (EPA) announced the Clean Air Interstate Rule (CAIR). CAIR requires 25 Eastern states to reduce NOx emissions from the power generation sector by 1.7 million tons in 2009 and 2.0 million tons by 2015. Low cost solutions to meet such regulations, and in particular those that can avoid the need for a costly selective catalytic reduction system (SCR), provide a strong incentive to continue to improve low NOx firing system technology to meet current and anticipated NOx control regulations. The overall objective of the work is to develop an enhanced combustion, low NOx pulverized coal burner, which, when integrated with Alstom's state-of-the-art, globally air staged low NOx firing systems will provide a means to achieve: Less than 0.15 lb/MMBtu NOx emissions when firing a high volatile Eastern or Western bituminous coal, Less than 0.10 lb/MMBtu NOx emissions when firing a subbituminous coal, NOx reduction costs at least 25% lower than the costs of an SCR, Validation of the NOx control technology developed through large (15 MWt) pilot scale demonstration, and Documentation required for economic evaluation and commercial application. During the project performance period, Alstom performed computational fluid dynamics (CFD) modeling and large pilot scale combustion testing in its Industrial Scale Burner Facility (ISBF) at its U.S. Power Plant Laboratories facility in Windsor, Connecticut in support of these objectives. The NOx reduction approach was to optimize near-field combustion to ensure that minimum NOx emissions are achieved with minimal impact on unburned carbon in ash, slagging and fouling, corrosion, and flame stability/turn-down. Several iterations of CFD and combustion testing on a Midwest coal led to an optimized design, which was extensively combustion tested on a range of coals. The data from these tests were then used to validate system costs and benefits versus SCR. Three coals were evaluated during the bench-scale and large pilot-scale testing tasks. The three coals ranged from a very reactive subbituminous coal to a moderately reactive Western bituminous coal to a much less reactive Midwest bituminous coal. Bench-scale testing was comprised of standard ASTM properties evaluation, plus more detailed characterization of fuel properties through drop tube furnace testing and thermogravimetric analysis. Bench-scale characterization of the three test coals showed that both NOx emissions and combustion performance are a strong function of coal properties. The more reactive coals evolved more of their fuel bound nitrogen in the substoichiometric main burner zone than less reactive coal, resulting in the potential for lower NOx emissions. From a combustion point of view, the more reactive coals also showed lower carbon in ash and CO values than the less reactive coal at any given main burner zone stoichiometry. According to bench-scale results, the subbituminous coal was found to be the most amenable to both low NOx, and acceptably low combustibles in the flue gas, in an air staged low NOx system. The Midwest bituminous coal, by contrast, was predicted to be the most challenging of the three coals, with the Western bituminous coal predicted to beh

David Towle; Richard Donais; Todd Hellewell; Robert Lewis; Robert Schrecengost

2007-06-30T23:59:59.000Z

64

Modeling of NOx formation in circular laminar jet flames  

E-Print Network [OSTI]

-premixed isolated circular laminar jet flame. The jet consists of the fuel rich inner region and the O2 rich outer region. The model estimates both thermal NOx and prompt NOx assuming single step kinetics for NOx formation and a thin flame model. Further the amount...

Siwatch, Vivek

2007-04-25T23:59:59.000Z

65

ULTRA LOW NOx INTEGRATED SYSTEM FOR NOx EMISSION CONTROL FROM COAL-FIRED BOILERS  

SciTech Connect (OSTI)

ALSTOM Power Inc.'s Power Plant Laboratories, working in concert with ALSTOM Power's Performance Projects Group, has teamed with the U.S. Department of Energy's National Energy Technology Laboratory (DOE NETL) to conduct a comprehensive study to develop/evaluate low-cost, efficient NOx control technologies for retrofit to pulverized coal fired utility boilers. The objective of this project was to develop retrofit NOx control technology to achieve less than 0.15 lb/MMBtu NOx (for bituminous coals) and 0.10 lb/MMBtu NOx (for subbituminous coals) from existing pulverized coal fired utility boilers at a cost which is at least 25% less than SCR technology. Efficient control of NOx is seen as an important, enabling step in keeping coal as a viable part of the national energy mix in this century, and beyond. Presently 57% of U.S. electrical generation is coal based, and the Energy Information Agency projects that coal will maintain a lead in U.S. power generation over all other fuel sources for decades (EIA 1998 Energy Forecast). Yet, coal-based power is being strongly challenged by society's ever-increasing desire for an improved environment and the resultant improvement in health and safety. The needs of the electric-utility industry are to improve environmental performance, while simultaneously improving overall plant economics. This means that emissions control technology is needed with very low capital and operating costs. This project has responded to the industry's need for low NOx emissions by evaluating ideas that can be adapted to present pulverized coal fired systems, be they conventional or low NOx firing systems. The TFS 2000{trademark} firing system has been the ALSTOM Power Inc. commercial offering producing the lowest NOx emission levels. In this project, the TFS 2000{trademark} firing system served as a basis for comparison to other low NOx systems evaluated and was the foundation upon which refinements were made to further improve NOx emissions and related combustion performance. Three coals were evaluated during the bench-scale and large pilot-scale testing tasks. The three coals ranged from a very reactive Powder River Basin coal (PRB) to a moderately reactive Midwestern bituminous coal (HVB) to a less reactive medium volatile Eastern bituminous coal (MVB). Bench-scale testing was comprised of standard ASTM properties evaluation, plus more detailed characterization of fuel properties through drop tube furnace testing and thermogravimetric analysis.

Galen H. Richards; Charles Q. Maney; Richard W. Borio; Robert D. Lewis

2002-12-30T23:59:59.000Z

66

7, 97959828, 2007 Tropospheric ozone  

E-Print Network [OSTI]

ACPD 7, 9795­9828, 2007 Tropospheric ozone climatology over Beijing A. J. Ding et al. Title Page Chemistry and Physics Discussions Tropospheric ozone climatology over Beijing: analysis of aircraft data;ACPD 7, 9795­9828, 2007 Tropospheric ozone climatology over Beijing A. J. Ding et al. Title Page

Paris-Sud XI, Université de

67

8, 1106311101, 2008 Tropospheric Ozone  

E-Print Network [OSTI]

ACPD 8, 11063­11101, 2008 Tropospheric Ozone climatology in the southern subtropics G. Clain et al.0 License. Atmospheric Chemistry and Physics Discussions Tropospheric ozone climatology at two southern Tropospheric Ozone climatology in the southern subtropics G. Clain et al. Title Page Abstract Introduction

Paris-Sud XI, Université de

68

New Houston NOx Rules: Implications and Solutions  

E-Print Network [OSTI]

Capex $MM NOx Reduction Tons/yr Net Cost NPV10 $MM Case 1 4 50 3.6 a. Defer 1 year 4.2 loss due to delay 0.6 b. Defer 2 years 5.4 loss due to delay 1.7 c. Defer 3 years 8.5 loss due to delay 4.8 Case 2 35 750 31.8 a. Defer 1 year 42...

Cascone, R.

69

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Broader source: Energy.gov (indexed) [DOE]

end date: 09312012 * Percent complete: 16.67% * Barriers addressed - Lean NOx emission reduction - Particulate filtering using new catalysts - New catalysts for reducing...

70

Investigation on continuous soot oxidation and NOx reduction...  

Broader source: Energy.gov (indexed) [DOE]

4 th , 2009. Dearborn, MI Investigation on continuous soot oxidation and NOx reduction by SCR coated DPF Phillip Bush, Eminox Svetlana Iretskaya, Catalytic Solutions, Inc. Ted...

71

Effect of reductive treatments on Pt behavior and NOx storage...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

represent a promising approach to meet increasingly stringent NOx emission regulations on diesel and other lean-burn engines. Pt material properties, including dispersion and...

72

Novel Application of Air Separation Membranes Reduces NOx Emissions...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Application of Air Separation Membranes Reduces NOx Emissions Technology available for licensing: Selective permeation of gases using an air separation membrane. Can be retrofitted...

73

Lean NOx Reduction with Dual Layer LNT/SCR Catalysts  

Broader source: Energy.gov (indexed) [DOE]

PGM & minimize fuel penalty in meeting NOx emission targets (adapted from Gandhi et al., US Patent, 2007) 3 Fundamental Issues for Dual Layer LNT - SCR proximity: Dual...

74

Dynamometer Evaluation of Plasma-Catalyst for Diesel NOx Reduction  

Broader source: Energy.gov (indexed) [DOE]

Dynamometer Evaluation of Plasma- Catalyst for Diesel NOx Reduction February 20, 2003 CRADA Protected Document and Data 2 Introduction * Engine dynamometer evaluation of...

75

Cummins/ORNL-FEERC CRADA: NOx Control & Measurement Technology...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Evaluation ace032partridge2011o.pdf More Documents & Publications CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines Vehicle...

76

Cummins/ORNL-FEERC CRADA: NOx Control & Measurement Technology...  

Broader source: Energy.gov (indexed) [DOE]

Vehicle Technologies Office Merit Review 2014: Cummins-ORNLFEERC Emissions CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines CumminsORNL-FEERC...

77

Spatiotemporal Distribution of NOx Storage: a Factor Controlling...  

Broader source: Energy.gov (indexed) [DOE]

LNT & SCR CLEERS Coordination & Joint Development of Benchmark Kinetics for LNT & SCR CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines...

78

Virtual Oxygen Sensor for Innovative NOx and PM Emission Control...  

Broader source: Energy.gov (indexed) [DOE]

2009 - Poster Session August 3 rd , Hyatt Regency Dearborn Hotel Virtual Oxygen Sensor Innovative NOx and PM Emission Control Technologies J. Seebode, E. Stlting,...

79

Lean NOx Traps - Microstructural Studies of Real World and Model...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Traps - Microstructural Studies of Real World and Model Catalysts Lean NOx Traps - Microstructural Studies of Real World and Model Catalysts 2005 Diesel Engine Emissions Reduction...

80

An Experimental Investigation of the Origin of Increased NOx...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

NOx Emissions When Fueling a Heavy-Duty Compression-Ignition Engine with Soy Biodiesel Optical engine experiments suggest that near stoichiometric charge-gas mixtures in the...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Emission Control Catalysts Three-Dimensional Composite Nanostructures for Lean NOx Emission Control Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts...

82

Three-Dimensional Composite Nanostructures for Lean NOx Emission...  

Broader source: Energy.gov (indexed) [DOE]

Nanowire Lean NOx Emission Control Catalysts Ultra-efficient, Robust and Well-defined Nano-Array based Monolithic Catalysts Three-Dimensional Composite Nanostructures for Lean...

83

Investigation of Aging Mechanisms in Lean NOx Traps  

Broader source: Energy.gov (indexed) [DOE]

Annual Merit Review 1 Investigation of Aging Mechanisms in Lean NOx Traps Mark Crocker Center for Applied Energy Research, University of Kentucky May 20, 2009 This presentation...

84

Fuel Processor Enabled NOx Adsorber Aftertreatment System for...  

Broader source: Energy.gov (indexed) [DOE]

4 Diesel Engine Emissions Reduction Conference Coronado, California August 29-September 2, 2004 Fuel Processor Enabled NOx Adsorber After-Treatment System for Diesel Engine...

85

H2-Assisted NOx Traps: Test Cell Results Vehicle Installations  

Broader source: Energy.gov (indexed) [DOE]

* New Power Supply * Under 250W consumption * Minimal heat rejected * Compact transformer * High-temperature flange seals * Reduced leakage 4 H2-Assisted NOx Trap: Test...

86

Ozone decomposing filter  

DOE Patents [OSTI]

In an improved ozone decomposing air filter carbon fibers are held together with a carbonized binder in a perforated structure. The structure is made by combining rayon fibers with gelatin, forming the mixture in a mold, freeze-drying, and vacuum baking.

Simandl, Ronald F. (Farragut, TN); Brown, John D. (Harriman, TN); Whinnery, Jr., LeRoy L. (Dublin, CA)

1999-01-01T23:59:59.000Z

87

Excellent Sulfur Resistance of Pt/BaO/CeO2 Lean NOx Trap Catalysts...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NOx Trap Catalysts. Excellent Sulfur Resistance of PtBaOCeO2 Lean NOx Trap Catalysts. Abstract: In this work, we investigated the NOx storage behavior of Pt-BaOCeO2 catalysts,...

88

Fuel Consumption and NOx Trade-offs on a Port-Fuel-Injected SI...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Consumption and NOx Trade-offs on a Port-Fuel-Injected SI Gasoline Engine Equipped with a Lean-NOx Trap Fuel Consumption and NOx Trade-offs on a Port-Fuel-Injected SI Gasoline...

89

Durability of NOx Absorbers | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat Pump Models |Conduct, Parent(CRADA andDriving Innovation atDumping09of NOx

90

NOx Sensor Development | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXTDevelopment NOxAftertreatmentSensor

91

Leadership in Low NOx/ Lochinvar Corporation  

E-Print Network [OSTI]

, Texas Nashville, Tennessee On April 19, 2000, the Texas Natural Resource Conservation Commission adopted statewide NOx emission limits for all natural gas-fired water heaters, boilers and process heaters with input rates of 2 million Btu/hr or less... for the purposes of generating efficient boilers, and process heaters having a BTU rating of up and environmentally friendly hot water production. to 2,000,000 BTU/hour within the state of Texas. Some readers of this paper may already be aware It's not everyday...

Sheko, D.; Boston, S.; Moore, J.

92

Low-NOx Gas Turbine Injectors Utilizing Hydrogen-Rich Opportunity...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

NOx Gas Turbine Injectors Utilizing Hydrogen-Rich Opportunity Fuels - Fact Sheet, 2011 Low-NOx Gas Turbine Injectors Utilizing Hydrogen-Rich Opportunity Fuels - Fact Sheet, 2011...

93

Plasma-Activated Lean NOx Catalysis for Heavy-Duty Diesel Emissions...  

Broader source: Energy.gov (indexed) [DOE]

vs. Plasma-Facilitated Lean NOx Catalysis Selective reduction of NOx in oxygen rich environments with plasma-assisted catalysis: Catalyst development and mechanistic...

94

Heavy-Duty NOx Emissions Control: Reformer-Assisted vs. Plasma...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

NOx Catalysis for Heavy-Duty Diesel Emissions Control Selective reduction of NOx in oxygen rich environments with plasma-assisted catalysis: Catalyst development and mechanistic...

95

NOx reduction by electron beam-produced nitrogen atom injection  

DOE Patents [OSTI]

Deactivated atomic nitrogen generated by an electron beam from a gas stream containing more than 99% N.sub.2 is injected at low temperatures into an engine exhaust to reduce NOx emissions. High NOx reduction efficiency is achieved with compact electron beam devices without use of a catalyst.

Penetrante, Bernardino M. (San Ramon, CA)

2002-01-01T23:59:59.000Z

96

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program through the twelfth quarter, January-March 2003, in the following task areas: Task 1--Oxygen Enhanced Combustion, Task 2--Oxygen Transport Membranes, Task 3--Economic Evaluation and Task 4--Program Management. The program is proceeding in accordance with the objectives for the third year. Pilot scale experiments conducted at the University of Utah explored both the effectiveness of oxygen addition and the best way to add oxygen with a scaled version of Riley Power's newest low NOx burner design. CFD modeling was done to compare the REI's modeling results for James River Unit 3 with the NOx and LOI results obtained during the demonstration program at that facility. Investigation of an alternative method of fabrication of PSO1d elements was conducted. OTM process development work has concluded with the completion of a long-term test of a PSO1d element Economic evaluation has confirmed the advantage of oxygen-enhanced combustion. Proposals have been submitted for two additional beta test sites. Commercial proposals have been submitted. Economic analysis of a beta site test performance was conducted.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2003-04-01T23:59:59.000Z

97

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program in the seventh quarter October-December 2001 in the following task areas: Task 1 - Oxygen Enhanced Combustion, Task 2 - Oxygen Transport Membranes, Task 3 - Economic Evaluation and Task 4 - Program Management. Computational fluid dynamic (CFD) modeling of oxygen injection strategies was performed during the quarter resulting in data that suggest the oxygen injection reduces NOx emissions while reducing LOI. Pilot-scale testing activities concluded at the University of Utah this quarter. Testing demonstrated that some experimental conditions can lead to NOx emissions well below the 0.15 lb/MMBtu limit. Evaluation of alternative OTM materials with improved mechanical properties continued this quarter. Powder procedure optimization continued and sintering trial began on an element with a new design. Several OTM elements were tested in Praxair's single tube high-pressure test facility under various conditions. A modified PSO1d element demonstrated stable oxygen product purity of >98% and oxygen flux of 68% of target. Updated test results and projected economic performance have been reviewed with the Utility Industrial Advisors. The economic comparison remains very favorable for O{sub 2} enhanced combustion. Discussions regarding possible Beta sites have been held with three other utilities in addition to the industrial advisors. Proposals will be prepared after the completion of full scale burner testing. Beta test cost estimating work has been initiated.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2002-01-01T23:59:59.000Z

98

Ultra-Low NOx Advanced Vortex Combustor  

SciTech Connect (OSTI)

An ultra lean-premixed Advanced Vortex Combustor (AVC) has been developed and tested. The natural gas fueled AVC was tested at the U.S. Department of Energy’s National Energy Technology Laboratory (USDOE NETL) test facility in Morgantown (WV). All testing was performed at elevated pressures and inlet temperatures and at lean fuel-air ratios representative of industrial gas turbines. The improved AVC design exhibited simultaneous NOx/CO/UHC emissions of 4/4/0 ppmv (all emissions are at 15% O2 dry). The design also achieved less than 3 ppmv NOx with combustion efficiencies in excess of 99.5%. The design demonstrated tremendous acoustic dynamic stability over a wide range of operating conditions which potentially makes this approach significantly more attractive than other lean premixed combustion approaches. In addition, a pressure drop of 1.75% was measured which is significantly lower than conventional gas turbine combustors. Potentially, this lower pressure drop characteristic of the AVC concept translates into overall gas turbine cycle efficiency improvements of up to one full percentage point. The relatively high velocities and low pressure drops achievable with this technology make the AVC approach an attractive alternative for syngas fuel applications.

Edmonds, R.G. (Ramgen Power Systems, Inc., Bellevue, WA); Steele, R.C. (Ramgen Power Systems, Inc., Bellevue, WA); Williams, J.T. (Ramgen Power Systems, Inc., Bellevue, WA); Straub, D.L.; Casleton, K.H.; Bining, Avtar (California Energy Commission, Sacramento, CA)

2006-05-01T23:59:59.000Z

99

ULTRA-LOW NOX ADVANCED VORTEX COMBUSTOR  

SciTech Connect (OSTI)

An ultra lean-premixed Advanced Vortex Combustor (AVC) has been developed and tested. The natural gas fueled AVC was tested at the U.S. Department of Energy’s National Energy Technology Laboratory (USDOE NETL) test facility in Morgantown (WV). All testing was performed at elevated pressures and inlet temperatures and at lean fuel-air ratios representative of industrial gas turbines. The improved AVC design exhibited simultaneous NOx/CO/UHC emissions of 4/4/0 ppmv (all emissions are at 15% O2 dry). The design also achieved less than 3 ppmv NOx with combustion efficiencies in excess of 99.5%. The design demonstrated tremendous acoustic dynamic stability over a wide range of operating conditions which potentially makes this approach significantly more attractive than other lean premixed combustion approaches. In addition, a pressure drop of 1.75% was measured which is significantly lower than conventional gas turbine combustors. Potentially, this lower pressure drop characteristic of the AVC concept translates into overall gas turbine cycle efficiency improvements of up to one full percentage point. The relatively high velocities and low pressure drops achievable with this technology make the AVC approach an attractive alternative for syngas fuel applications.

Ryan G. Edmonds; Robert C. Steele; Joseph T. Williams; Douglas L. Straub; Kent H. Casleton; Avtar Bining

2006-05-01T23:59:59.000Z

100

Real-World Studies of Ambient Ozone Formation as a Function of NOx  

Broader source: Energy.gov (indexed) [DOE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "ofEarlyEnergy 0611__Joint_DOE_GoJ_AMS_Data_v3.pptx More DocumentsCommunicationsProvides anTopDepartment

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program through the fourth quarter January-March 2001 in the following task areas: Task 1 - Oxygen Enhanced Combustion, Task 2 - Oxygen Transport Membranes and Task 4 - Program Management. This report will also recap the results of the past year. The program is proceeding in accordance with the objectives for the first year. OTM material characterization was completed. 100% of commercial target flux was demonstrated with OTM disks. The design and assembly of Praxair's single tube high-pressure test facility was completed. The production of oxygen with a purity of better than 99.5% was demonstrated. Coal combustion testing was conducted at the University of Arizona. Modest oxygen enhancement resulted in NOx emissions reduction. The injector for oxygen enhanced coal based reburning was conducted at Praxair. Combustion modeling with Keystone boiler was completed. Pilot-scale combustion test furnace simulations continued this quarter.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2001-04-01T23:59:59.000Z

102

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program through the thirteenth quarter, April-June 2003, in the following task areas: Task 1--Oxygen Enhanced Combustion, Task 3--Economic Evaluation and Task 4--Program Management. The program is proceeding in accordance with project objectives. REI's model was modified to evaluate mixing issues in the upper furnace of a staged unit. Analysis of the results, and their potential application to this unit is ongoing. Economic evaluation continues to confirm the advantage of oxygen-enhanced combustion. A contract for a commercial demonstration has been signed with the Northeast Generation Services Company to supply oxygen and license the oxygen enhanced low NOx combustor technology for use at the 147-megawatt coal fired Mt. Tom Station in Holyoke, MA. Commercial proposals have been submitted. Economic analysis of a beta site test performance was conducted.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2003-08-01T23:59:59.000Z

103

Oxidation State Optimization for Maximum Efficiency of NOx Adsorber...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Directions in Engine-Efficiency and Emissions Research (DEER) Conference in Detroit, MI, September 27-30, 2010. deer10li.pdf More Documents & Publications Lean NOx Trap...

104

Functionality of Commercial NOx Storage-Reduction Catalysts and...  

Broader source: Energy.gov (indexed) [DOE]

N.A. Ottinger, J.A. Pihl, T.J. Toops, C. Finney, M. Lance, C. Stuart Daw, "Types, Spatial Distribution, Stability, and Performance Impact of Sulfur on a Lean NOx Trap...

105

Cummins/ORNL-FEERC CRADA: NOx Control & Measurement Technology...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

D.C. ace032partridge2010o.pdf More Documents & Publications CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines CumminsORNL-FEERC...

106

Cummins/ORNL-FEERC CRADA: NOx Control & Measurement Technology...  

Broader source: Energy.gov (indexed) [DOE]

Washington D.C. ace32partridge.pdf More Documents & Publications CumminsORNL-FEERC CRADA: NOx Control & Measurement Technology for Heavy-Duty Diesel Engines CumminsORNL-FEERC...

107

Lean Gasoline Engine Reductant Chemistry During Lean NOx Trap Regeneration  

SciTech Connect (OSTI)

Lean NOx Trap (LNT) catalysts can effectively reduce NOx from lean engine exhaust. Significant research for LNTs in diesel engine applications has been performed and has led to commercialization of the technology. For lean gasoline engine applications, advanced direct injection engines have led to a renewed interest in the potential for lean gasoline vehicles and, thereby, a renewed demand for lean NOx control. To understand the gasoline-based reductant chemistry during regeneration, a BMW lean gasoline vehicle has been studied on a chassis dynamometer. Exhaust samples were collected and analyzed for key reductant species such as H2, CO, NH3, and hydrocarbons during transient drive cycles. The relation of the reductant species to LNT performance will be discussed. Furthermore, the challenges of NOx storage in the lean gasoline application are reviewed.

Choi, Jae-Soon [ORNL] [ORNL; Prikhodko, Vitaly Y [ORNL] [ORNL; Partridge Jr, William P [ORNL] [ORNL; Parks, II, James E [ORNL; Norman, Kevin M [ORNL] [ORNL; Huff, Shean P [ORNL] [ORNL; Chambon, Paul H [ORNL] [ORNL; Thomas, John F [ORNL] [ORNL

2010-01-01T23:59:59.000Z

108

Nitrogen Isotopes as Indicators of NOx Source Contributions to  

E-Print Network [OSTI]

of NOx are dominated by fossilfuelcombustion(63%)frombothstationary(e.g.,power plant electricity andassociatedatmosphericdepositionofnitrate(NO3 - )pose threats to global ecosystems and human health (2, 3). Contemporary global emissions

Elliott, Emily M.

109

Modeling The NOx Emissions In A Low NOx Burner While Fired With Pulverized Coal And Dairy Biomass Blends  

E-Print Network [OSTI]

by themselves already require cleanup technology; newer regulations will require development of new and economical technologies. Using a blend of traditional fuels & biomass is a promising technology to reduce NOX emissions. Experiments conducted previously...

Uggini, Hari

2012-07-16T23:59:59.000Z

110

Seasonal versus Episodic Performance Evaluation for an Eulerian Photochemical Air Quality Model  

SciTech Connect (OSTI)

This study presents detailed evaluation of the seasonal and episodic performance of the Community Multiscale Air Quality (CMAQ) modeling system applied to simulate air quality at a fine grid spacing (4 km horizontal resolution) in central California, where ozone air pollution problems are severe. A rich aerometric database collected during the summer 2000 Central California Ozone Study (CCOS) is used to prepare model inputs and to evaluate meteorological simulations and chemical outputs. We examine both temporal and spatial behaviors of ozone predictions. We highlight synoptically driven high-ozone events (exemplified by the four intensive operating periods (IOPs)) for evaluating both meteorological inputs and chemical outputs (ozone and its precursors) and compare them to the summer average. For most of the summer days, cross-domain normalized gross errors are less than 25% for modeled hourly ozone, and normalized biases are between {+-}15% for both hourly and peak (1 h and 8 h) ozone. The domain-wide aggregated metrics indicate similar performance between the IOPs and the whole summer with respect to predicted ozone and its precursors. Episode-to-episode differences in ozone predictions are more pronounced at a subregional level. The model performs consistently better in the San Joaquin Valley than other air basins, and episodic ozone predictions there are similar to the summer average. Poorer model performance (normalized peak ozone biases <-15% or >15%) is found in the Sacramento Valley and the Bay Area and is most noticeable in episodes that are subject to the largest uncertainties in meteorological fields (wind directions in the Sacramento Valley and timing and strength of onshore flow in the Bay Area) within the boundary layer.

Jin, Ling; Brown, Nancy J.; Harley, Robert A.; Bao, Jian-Wen; Michelson, Sara A; Wilczak, James M

2010-04-16T23:59:59.000Z

111

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program through the ninth quarter April-June 2002 in the following task areas: Task 1--Oxygen Enhanced Combustion, Task 2--Oxygen Transport Membranes, Task 3--Economic Evaluation and Task 4--Program Management. The program is proceeding in accordance with the objectives for the third year. Full-scale testing using the Industrial Boiler Simulation Facility (ISBF) at Alstom Power was completed. The pilot scale experiments to evaluate the effect of air preheat and transport air stoichiometric ratio (SR) on NOx emissions were conducted at the University of Utah. Combustion modeling activities continued with full-scale combustion test furnace simulations. An OTM element was tested in Praxair's single tube high-pressure test facility and two thermal cycles were completed. PSO1d elements of new dimension were tested resulting in a lower flux than previous PSO1d elements of different dimensions, however, no element deformation was observed. Economic evaluation has confirmed the advantage of oxygen-enhanced combustion. Two potential host beta sites have been identified and proposals submitted.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2002-08-01T23:59:59.000Z

112

OXYGEN ENHANCED COMBUSTION FOR NOx CONTROL  

SciTech Connect (OSTI)

This quarterly technical progress report will summarize work accomplished for the Program through the fourth quarter January-March 2002 in the following task areas: Task 1--Oxygen Enhanced Combustion, Task 2--Oxygen Transport Membranes, Task 3--Economic Evaluation and Task 4--Program Management. This report will also recap the results of the past year. The program is proceeding in accordance with the objectives for the second year. The first round of pilot scale testing with 3 bituminous coals was completed at the University of Utah. Full-scale testing equipment is in place and experiments are underway. Coal combustion lab-scale testing was completed at the University of Arizona. Modest oxygen enhancement resulted in NOx emissions reduction. Combustion modeling activities continued with pilot-scale combustion test furnace simulations. 75% of target oxygen flux was demonstrated with small PSO1 tube in Praxair's single tube high-pressure test facility. The production of oxygen with a purity of better than 99.999% was demonstrated. Economic evaluation has confirmed the advantage of oxygen-enhanced combustion. Two potential host sites have been identified.

David R. Thompson; Lawrence E. Bool; Jack C. Chen

2002-04-01T23:59:59.000Z

113

NARSTO OZONE ASSESSMENT EXECUTIVE SUMMARY  

E-Print Network [OSTI]

. Atmospheric scientists examine O3 production and transport through measurements, analysis, and the application Canada, the United States, and Mexico. Although policy recommendations are not within the purview organic compounds (VOCs) and nitrogen oxides (NOx ) are exposed to sunlight. Since the emissions

114

Seasonal thermal energy storage  

SciTech Connect (OSTI)

This report describes the following: (1) the US Department of Energy Seasonal Thermal Energy Storage Program, (2) aquifer thermal energy storage technology, (3) alternative STES technology, (4) foreign studies in seasonal thermal energy storage, and (5) economic assessment.

Allen, R.D.; Kannberg, L.D.; Raymond, J.R.

1984-05-01T23:59:59.000Z

115

Thermal Durability of Cu-CHA NH3-SCR Catalysts for Diesel NOx...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Durability of Cu-CHA NH3-SCR Catalysts for Diesel NOx Reduction. Thermal Durability of Cu-CHA NH3-SCR Catalysts for Diesel NOx Reduction. Abstract: Multiple catalytic functions...

116

Effect of BaO Morphology on NOx Abatement: NO Interaction with...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

BaO Morphology on NOx Abatement: NO Interaction with Unsupported and O-Supported BaO. Effect of BaO Morphology on NOx Abatement: NO Interaction with Unsupported and O-Supported...

117

Water-induced morphology changes in BaO/?-Al2O3 NOx storage...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

materials. Water-induced morphology changes in BaO?-Al2O3 NOx storage materials. Abstract: Exposure of NO2-saturated BaO?-Al2O3 NOx storage materials to H2O vapour...

118

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study...  

Broader source: Energy.gov (indexed) [DOE]

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Presentation given...

119

Development of a Stand-Alone Urea-SCR System for NOx Reduction...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Stand-Alone Urea-SCR System for NOx Reduction in Marine Diesel Engines Development of a Stand-Alone Urea-SCR System for NOx Reduction in Marine Diesel Engines Stand-alone urea SCR...

120

Effect of Engine-Out NOx Control Strategies on PM Size Distribution...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Engine-Out NOx Control Strategies on PM Size Distribution in Heavy-Duty Diesel Engines Developed for 2010 Effect of Engine-Out NOx Control Strategies on PM Size Distribution in...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Combining Biodiesel and EGR for Low-Temperature NOx and PM Reductions...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Biodiesel and EGR for Low-Temperature NOx and PM Reductions Combining Biodiesel and EGR for Low-Temperature NOx and PM Reductions Poster presentation at the 2007 Diesel...

122

NH3 generation over commercial Three-Way Catalysts and Lean-NOx...  

Broader source: Energy.gov (indexed) [DOE]

NH3 generation over commercial Three-Way Catalysts and Lean-NOx Traps NH3 generation over commercial Three-Way Catalysts and Lean-NOx Traps Research to identify most promising...

123

Safe and compact ammonia storage/delivery systems for SCR-DeNOX...  

Office of Environmental Management (EM)

Safe and compact ammonia storagedelivery systems for SCR-DeNOX in automotive units Safe and compact ammonia storagedelivery systems for SCR-DeNOX in automotive units Presentation...

124

E-Print Network 3.0 - air pollutants ozone Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 Global Ozone Project Ozone Formation in Summary: , power plants and industry all emit air pollution that forms ground-level ozone. Ozone is a primary... Stratospheric and...

125

Aeroderivative Gas Turbines Can Meet Stringent NOx Control Requirements  

E-Print Network [OSTI]

for controlling NOx emissions will be discussed. Steam injection has a very favorable effect on engine performance raising both the power output and efficiency. As an example, full steam injection in the GE LM5000 gas turbine :tncreases the power output from... methods for reducing the NOx levels of the LM2500 and LM5000 engines. These engines are aircraft-derivative turbine engines, which are used in a variety of industrial applications. Efforts have been concentrated on the use of water or steam injection...

Keller, S. C.; Studniarz, J. J.

126

The effects of ethylenediurea and sodium erythorbate on photosynthetic function of ozone-exposed loblolly pine seedlings  

E-Print Network [OSTI]

-top chambers in east Texas for one growing season beginning in April 1994 while being exposed to either sub-ambient (CF), approximate ambient (NF), 1.5Y,, 2.OX, or 2.5X ambient ozone levels. Net photosynthesis (A), stomatal conductance (g), and chloroplast...

Kuehler, Eric Anthony

1995-01-01T23:59:59.000Z

127

Use of Simulation To Optimize NOx Abatement by Absorption and Selective Catalytic Reduction  

E-Print Network [OSTI]

Use of Simulation To Optimize NOx Abatement by Absorption and Selective Catalytic Reduction Andrew This paper describes the development of an ASPEN PLUS simulation model for a commercial NOx abatement system nitric acid production and the abatement of NOx- laden effluent streams for environmental protection.1

Liu, Y. A.

128

Quantification of Variability and Uncertainty in Hourly NOx Emissions from Coal-Fired Power Plants  

E-Print Network [OSTI]

to quantify variability and uncertainty for NOx emissions from coal-fired power plants. Data for hourly NOx emissions, heat rate, gross load and capacity factor of 32 units from 9 different power plants were analyzed Uncertainty, Variability, Emission Factors, Coal-Fired Power Plants, NOx emissions, Regression Models

Frey, H. Christopher

129

Influence of combustion parameters on NOx production in an industrial boiler  

E-Print Network [OSTI]

Influence of combustion parameters on NOx production in an industrial boiler M.A. Habib a,*, M; accepted 14 April 2007 Available online 24 June 2007 Abstract NOx formation during the combustion process occurs mainly through the oxidation of nitrogen in the combustion air (thermal NOx) and through oxidation

Aldajani, Mansour A.

130

Electrochemical NOx Sensor for Monitoring Diesel Emissions  

SciTech Connect (OSTI)

Increasingly stringent emissions regulations will require the development of advanced gas sensors for a variety of applications. For example, compact, inexpensive sensors are needed for detection of regulated pollutants, including hydrocarbons (HCs), CO, and NO{sub x}, in automotive exhaust. Of particular importance will be a sensor for NO{sub x} to ensure the proper operation of the catalyst system in the next generation of diesel (CIDI) automobiles. Because many emerging applications, particularly monitoring of automotive exhaust, involve operation in harsh, high-temperature environments, robust ceramic-oxide-based electrochemical sensors are a promising technology. Sensors using yttria-stabilized zirconia (YSZ) as an oxygen-ion-conducting electrolyte have been widely reported for both amperometric and potentiometric modes of operation. These include the well-known exhaust gas oxygen (EGO) sensor. More recently, ac impedance-based (i.e., impedance-metric) sensing techniques using YSZ have been reported for sensing water vapor, hydrocarbons, CO, and NO{sub x}. Typically small-amplitude alternating signal is applied, and the sensor response is measured at a specified frequency. Most impedance-metric techniques have used the modulus (or magnitude) at low frequencies (< 1 Hz) as the sensing signal and attribute the measured response to interfacial phenomena. Work by our group has also investigated using phase angle as the sensing signal at somewhat higher frequencies (10 Hz). The higher frequency measurements would potentially allow for reduced sampling times during sensor operation. Another potential advantage of impedance-metric NO{sub x} sensing is the similarity in response to NO and NO{sub 2} (i.e., total-NO{sub x} sensing). Potentiometric NO{sub x} sensors typically show higher sensitivity to NO2 than NO, and responses that are opposite in sign. However, NO is more stable than NO{sub 2} at temperatures > 600 C, and thermodynamic calculations predict {approx}90% NO, balance NO{sub 2}. Since automotive exhaust sensors will probably be required to operate at temperatures > 600 C, NO is the dominant component in thermodynamic equilibrium and the target NOx species. Also, the use of upstream catalysts could further promote the conversion of NO{sub x} species to NO. Therefore, the focus of current work is to investigate the response to NO. Nevertheless, minimizing the sensitivity to a variety of competing species is important in order to obtain the accuracy necessary for achieving the emission limits. Mitigating the effect of interfering gases (e.g., O{sub 2}, water vapor, HCs, etc.) is an area of current study. For impedance metric NO{sub x} sensors, our previous work has demonstrated that the cross-sensitivity to O{sub 2} may be accounted for by comparing measurements at multiple frequencies. Other strategies for compensation are also being explored, including calibration using data from existing sensors located nearby. Our current work has made significant advances in terms of developing prototype sensors more suitable for commercialization. Also, dynamometer testing has provided real-world sensor performance data that will be useful in approaching potential suppliers to whom we can transfer the technology for commercialization. The advances are a direct result of understanding the sensing mechanisms responsible for impedance-based NO{sub x} sensing and the effect of materials choice and sensor design/geometry.

Woo, L Y; Glass, R S

2008-11-14T23:59:59.000Z

131

Ozone Reductions Using Residential Building Envelopes  

SciTech Connect (OSTI)

Ozone is an air pollutant with that can have significant health effects and a significant source of ozone in some regions of California is outdoor air. Because people spend the vast majority of their time indoors, reduction in indoor levels of ozone could lead to improved health for many California residents. Ozone is removed from indoor air by surface reactions and can also be filtered by building envelopes. The magnitude of the envelope impact depends on the specific building materials that the air flows over and the geometry of the air flow paths through the envelope that can be changes by mechanical ventilation operation. The 2008 Residential Building Standards in California include minimum requirements for mechanical ventilation by referencing ASHRAE Standard 62.2. This study examines the changes in indoor ozone depending on the mechanical ventilation system selected to meet these requirements. This study used detailed simulations of ventilation in a house to examine the impacts of different ventilation systems on indoor ozone concentrations. The simulation results showed that staying indoors reduces exposure to ozone by 80percent to 90percent, that exhaust ventilation systems lead to lower indoor ozone concentrations, that opening of windows should be avoided at times of high outdoor ozone, and that changing the time at which mechanical ventilation occurs has the ability to halve exposure to ozone. Future work should focus on the products of ozone reactions in the building envelope and the fate of these products with respect to indoor exposures.

Walker, Iain S.; Sherman, Max; Nazaroff, William W.

2009-02-01T23:59:59.000Z

132

Catalytic Combustion for Ultra-Low NOx Hydrogen Turbines  

SciTech Connect (OSTI)

Precision Combustion, Inc., (PCI) in close collaboration with Solar Turbines, Incorporated, has developed and demonstrated a combustion system for hydrogen fueled turbines that reduces NOx to low single digit level while maintaining or improving current levels of efficiency and eliminating emissions of carbon dioxide. Full scale Rich Catalytic Hydrogen (RCH1) injector was developed and successfully tested at Solar Turbines, Incorporated high pressure test facility demonstrating low single digit NOx emissions for hydrogen fuel in the range of 2200F-2750F. This development work was based on initial subscale development for faster turnaround and reduced cost. Subscale testing provided promising results for 42% and 52% H2 with NOx emissions of less than 2 ppm with improved flame stability. In addition, catalytic reactor element testing for substrate oxidation, thermal cyclic injector testing to simulate start-stop operation in a gas turbine environment, and steady state 15 atm. operation testing were performed successfully. The testing demonstrated stable and robust catalytic element component life for gas turbine conditions. The benefit of the catalytic hydrogen combustor technology includes capability of delivering near-zero NOx without costly post-combustion controls and without requirement for added sulfur control. In addition, reduced acoustics increase gas turbine component life. These advantages advances Department of Energy (DOE’s) objectives for achievement of low single digit NOx emissions, improvement in efficiency vs. postcombustion controls, fuel flexibility, a significant net reduction in Integrated Gasification Combined Cycle (IGCC) system net capital and operating costs, and a route to commercialization across the power generation field from micro turbines to industrial and utility turbines.

Etemad, Shahrokh; Baird, Benjamin; Alavandi, Sandeep

2011-06-30T23:59:59.000Z

133

Ozone decomposition in water solutions  

E-Print Network [OSTI]

. Hewes, III; B. S. , Texas ASH University Directed by Dr. R. R. Davison The rate of the decomposition of ozone in water solutions at various pH's and temperatures were ob- tained by an iodometrical method. The orders of the reactions and the reaction...

Hewes, Cecil Grayson

1969-01-01T23:59:59.000Z

134

6, 74277469, 2006 Linear ozone  

E-Print Network [OSTI]

from biases in the schemes' climatology coefficients. Cariolle v2.1 analyses showed biases of up to 20 and Kelder (1998) ozone climatology into the scheme. Chem2D-OPP v2.1 analyses showed biases up to 20 analysed temperatures and the temperature climatology supplied with the scheme. Future developments should

Boyer, Edmond

135

2, 15091543, 2002 Ozone production  

E-Print Network [OSTI]

.atmos-chem-phys.org/acpd/2/1509/ c European Geosciences Union 2002 Atmospheric Chemistry and Physics Discussions Ozone as a consequence of local catabatic winds. Aver- age mid-day peroxy radical concentrations at Mt. Cimone; Atlas and Ridley, 1996; Fischer et al., 1998; Zanis et al., 2000a, b). Often, free tropospheric

Boyer, Edmond

136

LOW NOx EMISSIONS IN A FUEL FLEXIBLE GAS TURBINE  

SciTech Connect (OSTI)

In alignment with Vision 21 goals, a study is presented here on the technical and economic potential for developing a gas turbine combustor that is capable of generating less that 2 ppm NOx emissions, firing on either coal synthesis gas or natural gas, and being implemented on new and existing systems. The proposed solution involves controlling the quantity of H2 contained in the fuel. The presence of H2 leads to increased flame stability such that the combustor can be operated at lower temperatures and produce less thermal NOx. Coal gas composition would be modified using a water gas shift converter, and natural gas units would implement a catalytic partial oxidation (CPOX) reactor to convert part of the natural gas feed to a syngas before fed back into the combustor. While both systems demonstrated technical merit, the economics involved in implementing such a system are marginal at best. Therefore, Praxair has decided not to pursue the technology any further at this time.

Raymond Drnevich; James Meagher; Vasilis Papavassiliou; Troy Raybold; Peter Stuttaford; Leonard Switzer; Lee Rosen

2004-08-01T23:59:59.000Z

137

Small, Inexpensive Combined NOx Sensor and O2 Sensor  

SciTech Connect (OSTI)

It has been successfully demonstrated in this program that a zirconia multilayer structure with rhodium-based porous electrodes performs well as an amperometric NOx sensor. The sensitivity of the sensor bodies operating at 650 to 700 C is large, with demonstrated current outputs of 14 mA at 500 ppm NOx from sensors with 30 layers. The sensor bodies are small (4.5 x 4.2 x 3.1 mm), rugged, and inexpensive. It is projected the sensor bodies will cost $5 - $10 in production. This program has built on another successful development program for an oxygen sensor based on the same principles and sponsored by DOE. This oxygen sensor is not sensitive to NOx. A significant technical hurdle has been identified and solved. It was found that the 100% Rh electrodes oxidize rapidly at the preferred operating temperatures of 650 - 700 C, and this oxidation is accompanied by a volume change which delaminates the sensors. The problem was solved by using alloys of Rh and Pt. It was found that a 10%/90% Rh/Pt alloy dropped the oxidation rate of the electrodes by orders of magnitude without degrading the NOx sensitivity of the sensors, allowing long-term stable operation at the preferred operating temperatures. Degradation in the sensor output caused by temperature cycling was identified as a change in resistance at the junction between the sensor body and the external leads attached to the sensor body. The degradation was eliminated by providing strong mechanical anchors for the wire and processing the junctions to obtain good electrical bonds. The NOx sensors also detect oxygen and therefore the fully-packaged sensor needs to be enclosed with an oxygen sensor in a small, heated zirconia chamber exposed to test gas through a diffusion plug which limits the flow of gas from the outside. Oxygen is pumped from the interior of the chamber to lower the oxygen content and the combination of measurements from the NOx and oxygen sensors yields the NOx content of the gas. Two types of electronic control units were designed and built. One control unit provides independent constant voltages to the NOx and oxygen sensors and reads the current from them (that is, detects the amount of test gas present). The second controller holds the fully-assembled sensor at the desired operating temperature and controllably pumps excess oxygen from the test chamber. While the development of the sensor body was a complete success, the development of the packaging was only partially successful. All of the basic principles were demonstrated, but the packaging was too complex to optimize the operation within the resources of the program. Thus, no fully-assembled sensors were sent to outside labs for testing of cross-sensitivities, response times, etc. Near the end of the program, Sensata Technologies of Attleboro, MA tested the sensor bodies and confirmed the CeramPhysics measurements as indicated in the following attached letter. Sensata was in the process of designing their own packaging for the sensor and performing cross-sensitivity tests when they stopped all sensor development work due to the automotive industry downturn. Recently Ceramatec Inc. of Salt Lake City has expressed an interest in testing the sensor, and other licensing opportunities are being pursued.

W. N. Lawless; C. F. Clark, Jr.

2008-09-08T23:59:59.000Z

138

Ozone production in transpacific Asian pollution plumes and implications for ozone air quality in California  

E-Print Network [OSTI]

Ozone production in transpacific Asian pollution plumes and implications for ozone air quality in transpacific Asian pollution plumes, and the implications for ozone air quality in California, by using pollution plumes. Strong dilution of Asian pollution plumes takes place during entrainment in the U

Park, Rokjin

139

Discharge cell for ozone generator  

DOE Patents [OSTI]

A discharge cell for use in an ozone generator is provided which can suppress a time-related reduction in ozone concentration without adding a catalytic gas such as nitrogen gas to oxygen gas as a raw material gas. The discharge cell includes a pair of electrodes disposed in an opposed spaced relation with a discharge space therebetween, and a dielectric layer of a three-layer structure consisting of three ceramic dielectric layers successively stacked on at least one of the electrodes, wherein a first dielectric layer of the dielectric layer contacting the one electrode contains no titanium dioxide, wherein a second dielectric layer of the dielectric layer exposed to the discharge space contains titanium dioxide in a metal element ratio of not lower than 10 wt %.

Nakatsuka, Suguru (Amagasaki, JP)

2000-01-01T23:59:59.000Z

140

Y-12 Plant Stratospheric Ozone Protection plan  

SciTech Connect (OSTI)

The Y-12 Plant staff is required by Lockheed Martin Energy Systems (Energy Systems) (formerly Martin Marietta Energy Systems) standard ESS-EP-129 to develop and implement a Stratospheric Ozone Protection Program which will minimize emissions of ozone-depleting substances to the environment and maximize the use of ozone-safe alternatives in order to comply with Title VI of the 1990 Clean Air Act (CAA) Amendments and the implementing regulations promulgated by the Environmental Protection Agency (EPA). This plan describes the requirements, initiatives, and accomplishments of the Y-12 Plant Stratospheric Ozone Protection Program.

NONE

1995-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Tropospheric Ozone Pollution and Personal Exposure  

E-Print Network [OSTI]

://www.nctcog.org/trans/air/ozone/formation.gif #12;Health Effects · Chest pain, coughing, throat irritation, and congestion · Wheezing and difficulty

Toohey, Darin W.

142

Congressionally Directed Project for Passive NOx Removal Catalysts Research  

SciTech Connect (OSTI)

The Recipient proposes to produce new scientific and technical knowledge and tools to enable the discovery and deployment of highly effective materials for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) from lean combustion exhaust. A second goal is to demonstrate a closely coupled experimental and computational approach to heterogeneous catalysis research. These goals will be met through the completion of four primary technical objectives: First, an in-depth kinetic analysis will be performed on two prominent classes of NOx SCR catalysts, Fe- and Cu-exchanged beta and ZSM-5 zeolites, over a wide range of catalyst formulation and under identical, high conversion conditions as a function of gas phase composition. Second, the nanoscale structure and adsorption chemistry of these high temperature (HT) and low temperature (LT) catalysts will be determined using in situ and operando spectroscopy under the same reaction conditions. Third, first-principles molecular simulations will be used to model the metal-zeolite active sites, their adsorption chemistry, and key steps in catalytic function. Fourth, this information will be integrated into chemically detailed mechanistic and kinetic descriptions and models of the operation of these well- defined NOx SCR catalysts under practically relevant reaction conditions. The new knowledge and models that derive from this work will be published in the scientific literature.

Schneider, William

2014-08-29T23:59:59.000Z

143

DOE's Studies of Weekday/Weekend Ozone Pollution in Southern...  

Energy Savers [EERE]

DOE's Studies of WeekdayWeekend Ozone Pollution in Southern California DOE's Studies of WeekdayWeekend Ozone Pollution in Southern California 2002 DEER Conference Presentation:...

144

The Weekend Ozone Effect - The Weekly Ambient Emissions Control...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

More Documents & Publications WeekendWeekday Ozone Study in the South Coast Air Basin DOE's Studies of WeekdayWeekend Ozone Pollution in Southern California...

145

Biomarker Response to Galactic Cosmic Ray-Induced NOx and the Methane Greenhouse Effect in the Atmosphere of an Earthlike Planet Orbiting an M-Dwarf Star  

E-Print Network [OSTI]

Planets orbiting in the habitable zone (HZ) of M-Dwarf stars are subject to high levels of galactic cosmic rays (GCRs) which produce nitrogen oxides in earthlike atmospheres. We investigate to what extent this NOx may modify biomarker compounds such as ozone (O3) and nitrous oxide (N2O), as well as related compounds such as water (H2O) (essential for life) and methane (CH4) (which has both abiotic and biotic sources) . Our model results suggest that such signals are robust, changing in the M-star world atmospheric column by up to 20% due to the GCR NOx effects compared to an M-star run without GCR effects and can therefore survive at least the effects of galactic cosmic rays. We have not however investigated stellar cosmic rays here. CH4 levels are about 10 times higher than on the Earth related to a lowering in hydroxyl (OH) in response to changes in UV. The increase is less than reported in previous studies. This difference arose partly because we used different biogenic input. For example, we employed 23% ...

Grenfell, J L; Patzer, B; Rauer, H; Segura, A; Stadelmann, A; Stracke, B; Titz, R; Von Paris, P; Grenfell, John Lee; Griessmeier, Jean-Mathias; Patzer, Beate; Rauer, Heike; Segura, Antigona; Stadelmann, Anja; Stracke, Barbara; Titz, Ruth; Paris, Philip von

2007-01-01T23:59:59.000Z

146

Seasonal Landscape Maintenance  

E-Print Network [OSTI]

Seasonal Landscape Maintenance Oklahoma State University, in compliance with Title VI and VII State University's Department of Horticulture and Landscape Architecture and Oklahoma Cooperative to dry between watering allows plants to develop stronger, deeper roots. However, some landscape plants

Balasundaram, Balabhaskar "Baski"

147

Ultra Low NOx Catalytic Combustion for IGCC Power Plants  

SciTech Connect (OSTI)

In order to meet DOE's goals of developing low-emissions coal-based power systems, PCI has further developed and adapted it's Rich-Catalytic Lean-burn (RCL{reg_sign}) catalytic reactor to a combustion system operating on syngas as a fuel. The technology offers ultra-low emissions without the cost of exhaust after-treatment, with high efficiency (avoidance of after-treatment losses and reduced diluent requirements), and with catalytically stabilized combustion which extends the lower Btu limit for syngas operation. Tests were performed in PCI's sub-scale high-pressure (10 atm) test rig, using a two-stage (catalytic then gas-phase) combustion process for syngas fuel. In this process, the first stage consists of a fuel-rich mixture reacting on a catalyst with final and excess combustion air used to cool the catalyst. The second stage is a gas-phase combustor, where the air used for cooling the catalyst mixes with the catalytic reactor effluent to provide for final gas-phase burnout and dilution to fuel-lean combustion products. During testing, operating with a simulated Tampa Electric's Polk Power Station syngas, the NOx emissions program goal of less than 0.03 lbs/MMBtu (6 ppm at 15% O{sub 2}) was met. NOx emissions were generally near 0.01 lbs/MMBtu (2 ppm at 15% O{sub 2}) (PCI's target) over a range on engine firing temperatures. In addition, low emissions were shown for alternative fuels including high hydrogen content refinery fuel gas and low BTU content Blast Furnace Gas (BFG). For the refinery fuel gas increased resistance to combustor flashback was achieved through preferential consumption of hydrogen in the catalytic bed. In the case of BFG, stable combustion for fuels as low as 88 BTU/ft{sup 3} was established and maintained without the need for using co-firing. This was achieved based on the upstream catalytic reaction delivering a hotter (and thus more reactive) product to the flame zone. The PCI catalytic reactor was also shown to be active in ammonia reduction in fuel allowing potential reductions in the burner NOx production. These reductions of NOx emissions and expanded alternative fuel capability make the rich catalytic combustor uniquely situated to provide reductions in capital costs through elimination of requirements for SCR, operating costs through reduction in need for NOx abating dilution, SCR operating costs, and need for co-firing fuels allowing use of lower value but more available fuels, and efficiency of an engine through reduction in dilution flows.

Shahrokh Etemad; Benjamin Baird; Sandeep Alavandi; William Pfefferle

2008-03-31T23:59:59.000Z

148

Lean NOx Trap Catalysis for Lean Natural Gas Engine Applications  

SciTech Connect (OSTI)

Distributed energy is an approach for meeting energy needs that has several advantages. Distributed energy improves energy security during natural disasters or terrorist actions, improves transmission grid reliability by reducing grid load, and enhances power quality through voltage support and reactive power. In addition, distributed energy can be efficient since transmission losses are minimized. One prime mover for distributed energy is the natural gas reciprocating engine generator set. Natural gas reciprocating engines are flexible and scalable solutions for many distributed energy needs. The engines can be run continuously or occasionally as peak demand requires, and their operation and maintenance is straightforward. Furthermore, system efficiencies can be maximized when natural gas reciprocating engines are combined with thermal energy recovery for cooling, heating, and power applications. Expansion of natural gas reciprocating engines for distributed energy is dependent on several factors, but two prominent factors are efficiency and emissions. Efficiencies must be high enough to enable low operating costs, and emissions must be low enough to permit significant operation hours, especially in non-attainment areas where emissions are stringently regulated. To address these issues the U.S. Department of Energy and the California Energy Commission launched research and development programs called Advanced Reciprocating Engine Systems (ARES) and Advanced Reciprocating Internal Combustion Engines (ARICE), respectively. Fuel efficiency and low emissions are two primary goals of these programs. The work presented here was funded by the ARES program and, thus, addresses the ARES 2010 goals of 50% thermal efficiency (fuel efficiency) and <0.1 g/bhp-hr emissions of oxides of nitrogen (NOx). A summary of the goals for the ARES program is given in Table 1-1. ARICE 2007 goals are 45% thermal efficiency and <0.015 g/bhp-hr NOx. Several approaches for improving the efficiency and emissions of natural gas reciprocating engines are being pursued. Approaches include: stoichiometric engine operation with exhaust gas recirculation and three-way catalysis, advanced combustion modes such as homogeneous charge compression ignition, and extension of the lean combustion limit with advanced ignition concepts and/or hydrogen mixing. The research presented here addresses the technical approach of combining efficient lean spark-ignited natural gas combustion with low emissions obtained from a lean NOx trap catalyst aftertreatment system. This approach can be applied to current lean engine technology or advanced lean engines that may result from related efforts in lean limit extension. Furthermore, the lean NOx trap technology has synergy with hydrogen-assisted lean limit extension since hydrogen is produced from natural gas during the lean NOx trap catalyst system process. The approach is also applicable to other lean engines such as diesel engines, natural gas turbines, and lean gasoline engines; other research activities have focused on those applications. Some commercialization of the technology has occurred for automotive applications (both diesel and lean gasoline engine vehicles) and natural gas turbines for stationary power. The research here specifically addresses barriers to commercialization of the technology for large lean natural gas reciprocating engines for stationary power. The report presented here is a comprehensive collection of research conducted by Oak Ridge National Laboratory (ORNL) on lean NOx trap catalysis for lean natural gas reciprocating engines. The research was performed in the Department of Energy's ARES program from 2003 to 2007 and covers several aspects of the technology. All studies were conducted at ORNL on a Cummins C8.3G+ natural gas engine chosen based on industry input to simulate large lean natural gas engines. Specific technical areas addressed by the research include: NOx reduction efficiency, partial oxidation and reforming chemistry, and the effects of sulfur poisons on the partial oxidation

Parks, II, James E [ORNL; Storey, John Morse [ORNL; Theiss, Timothy J [ORNL; Ponnusamy, Senthil [ORNL; Ferguson, Harley Douglas [ORNL; Williams, Aaron M [ORNL; Tassitano, James B [ORNL

2007-09-01T23:59:59.000Z

149

NOx Control Options and Integration for US Coal Fired Boilers  

SciTech Connect (OSTI)

This is the Final Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project was to develop cost-effective analysis tools and techniques for demonstrating and evaluating low-NOx control strategies and their possible impact on boiler performance for boilers firing US coals. The Electric Power Research Institute (EPRI) provided co-funding for this program. This project included research on: (1) In furnace NOx control; (2) Impacts of combustion modifications on boiler operation; (3) Selective Catalytic Reduction (SCR) catalyst testing and (4) Ammonia adsorption/removal on fly ash. Important accomplishments were achieved in all aspects of the project. Rich Reagent Injection (RRI), an in-furnace NOx reduction strategy based on injecting urea or anhydrous ammonia into fuel rich regions in the lower furnace, was evaluated for cyclone-barrel and PC fired utility boilers. Field tests successfully demonstrated the ability of the RRI process to significantly reduce NOx emissions from a staged cyclone-fired furnace operating with overfire air. The field tests also verified the accuracy of the Computational Fluid Dynamic (CFD) modeling used to develop the RRI design and highlighted the importance of using CFD modeling to properly locate and configure the reagent injectors within the furnace. Low NOx firing conditions can adversely impact boiler operation due to increased waterwall wastage (corrosion) and increased soot production. A corrosion monitoring system that uses electrochemical noise (ECN) corrosion probes to monitor, on a real-time basis, high temperature corrosion events within the boiler was evaluated. Field tests were successfully conducted at two plants. The Ohio Coal Development Office provided financial assistance to perform the field tests. To investigate soot behavior, an advanced model to predict soot production and destruction was implemented into an existing reacting CFD modeling tool. Comparisons between experimental data collected in a pilot scale furnace and soot behavior predicted by the CFD model showed good agreement. Field and laboratory tests were performed for SCR catalysts used for coal and biomass co-firing applications. Fundamental laboratory studies were performed to better understand mechanisms involved with catalyst deactivation. Field tests with a slip stream reactor were used to create catalyst exposed to boiler flue gas for firing coal and for co-firing coal and biomass. The field data suggests the mechanisms leading to catalyst deactivation are, in order of importance, channel plugging, surface fouling, pore plugging and poisoning. Investigations were performed to better understand the mechanisms involved with catalyst regeneration through mechanical or chemical methods. A computer model was developed to predict NOx reduction across the catalyst in a SCR. Experiments were performed to investigate the fundamentals of ammonia/fly ash interactions with relevance to the operation of advanced NOx control technologies such as selective catalytic reduction. Measurements were performed for ammonia adsorption isotherms on commercial fly ash samples subjected to a variety of treatments and on the chemistry of dry and semi-dry ammonia removal processes. This work resulted in the first fundamental ammonia isotherms on carbon-containing fly ash samples. This work confirms industrial reports that aqueous solution chemistry takes place upon the introduction of even very small amounts of water, while the ash remains in a semi-dry state.

Mike Bockelie; Marc Cremer; Kevin Davis; Martin Denison; Adel Sarofim; Connie Senior; Hong-Shig Shim; Dave Swenson; Bob Hurt; Eric Suuberg; Eric Eddings; Kevin Whitty; Larry Baxter; Calvin Bartholomew; William Hecker

2006-06-30T23:59:59.000Z

150

Synergies of High-Efficiency Clean Combustion and Lean NOx Trap...  

Broader source: Energy.gov (indexed) [DOE]

Combustion and Lean NOx Trap Catalysts investigation of potential synergies of low emission advanced combustion techniques and advanced lean exhaust catalytic aftertreatment....

151

Reduce NOx and Improve Energy Efficiency, Software Tools for Industry, Industrial Technologies Program (ITP) (Fact Sheet)  

SciTech Connect (OSTI)

This fact sheet describes how the Industrial Technologies Program NOx and Energy Assessment Tool (NxEAT) can help petroleum refining and chemical plants improve energy efficiency.

Not Available

2008-12-01T23:59:59.000Z

152

Reduction of NOx in Synthetic Diesel Exhaust via Two-Step Plasma...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Citation: Tonkyn RG, SE Barlow, and J Hoard.2003."Reduction of NOx in Synthetic Diesel Exhaust via Two-Step Plasma-Catalysis Treatment."Applied Catalysis. B,...

153

Effect of Thermal Aging on NO oxidation and NOx storage in a...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

More Documents & Publications Impacts of Biodiesel on Emission Control Devices NOx Abatement Research and Development CRADA with Navistar Incorporated Thermal Deactivation...

154

Plasma-Activated Lean NOx Catalysis for Heavy-Duty Diesel Emissions...  

Broader source: Energy.gov (indexed) [DOE]

Lean NOx Catalysis l Chemistry l Reducing Agent Effects l Collaboration with LEP CRADA l Aging Studies Plasma Initiation - + Electron Avalanche e - e - e - e - e - e - e -...

155

Engine and Reactor Evaluations of HC-SCR for Diesel NOx Reduction  

Broader source: Energy.gov (indexed) [DOE]

- Burch and Millington, Catalysis Today, 1996. - Shimizu et al., Applied Catalysis B: Environmental, 2000. * DOE NOx Discovery Project - Initiated in August of 2002, completed...

156

Flexible CHP System with Low NOx, CO and VOC Emissions - Fact...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Sheet, 2014 Flexible CHP System with Low NOx, CO and VOC Emissions - Fact Sheet, 2014 The Gas Technology Institute, in collaboration with Cannon Boiler Works, Integrated CHP...

157

An Assessment of Tropospheric Ozone Pollution  

E-Print Network [OSTI]

An Assessment of Tropospheric Ozone Pollution --A North American Perspective-- Surface Urban, California 94304 #12;AN ASSESSMENT OF TROPOSPHERIC OZONE POLLUTION: A NORTH AMERICAN PERSPECTIVE The NARSTO, Instituto Mexicano del Petroleo, Mexico, D.F., Mexico Alan Dunker, General Motors Research & Development

158

Defensive Investments and the Demand for Air Quality: Evidence from the NOx Budget Program and Ozone Reductions  

E-Print Network [OSTI]

The economic costs of environmental regulations have been widely debated since the U.S. began to restrict pollution emissions more than four decades ago. Using detailed production data from nearly 1.2 million plant ...

Deschênes, Olivier

2012-07-15T23:59:59.000Z

159

Defensive Investments and the Demand for Air Quality: Evidence from the NOx Budget Program and Ozone Reductions  

E-Print Network [OSTI]

Willingness to pay for air quality is a function of health and the costly defensive investments that contribute to health, but there is little research assessing the empirical importance of defensive investments. The setting ...

Deschênes, Olivier

160

Three-Dimensional Composite Nanostructures for Lean NOx Emission Control  

SciTech Connect (OSTI)

This final report to the Department of Energy (DOE) and National Energy Technology Laboratory (NETL) for DE-EE0000210 covers the period from October 1, 2009 to July 31, 2013. Under this project, DOE awarded UConn about $1,248,242 to conduct the research and development on a new class of 3D composite nanostructure based catalysts for lean NOx emission control. Much of the material presented here has already been submitted to DOE/NETL in quarterly technical reports. In this project, through a scalable solution process, we have successfully fabricated a new class of catalytic reactors, i.e., the composite nanostructure array (nano-array) based catalytic converters. These nanocatalysts, distinct from traditional powder washcoat based catalytic converters, directly integrate monolithic substrates together with nanostructures with well-defined size and shape during the scalable hydrothermal process. The new monolithic nanocatalysts are demonstrated to be able to save raw materials including Pt-group metals and support metal oxides by an order of magnitude, while perform well at various oxidation (e.g., CO oxidation and NO oxidation) and reduction reactions (H{sub 2} reduction of NOx) involved in the lean NOx emissions. The size, shape and arrangement of the composite nanostructures within the monolithic substrates are found to be the key in enabling the drastically reduced materials usage while maintaining the good catalytic reactivity in the enabled devices. The further understanding of the reaction kinetics associated with the unique mass transport and surface chemistry behind is needed for further optimizing the design and fabrication of good nanostructure array based catalytic converters. On the other hand, the high temperature stability, hydrothermal aging stability, as well as S-poisoning resistance have been investigated in this project on the nanocatalysts, which revealed promising results toward good chemical and mechanical robustness, as well as S-poisoning resistance. Further investigation is needed for unraveling the understanding, design and selection principles of this new class of nanostructure based monolithic catalysts.

Gao, Pu-Xian

2013-07-31T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

SOx/NOx sorbent and process of use  

DOE Patents [OSTI]

An alumina sorbent capable of adsorbing NOx and SOx from waste gases and being regenerated by heating above 600 C. is made by incorporating an alumina stabilizing agent into the sorbent. A preferred method is to add the stabilizer when the alumina is precipitated. The precipitated powder is formed subsequently into a slurry, milled and dripped to form the stabilizing spheroidal alumina particles. These particles are impregnated with an alkali metal or alkaline earth metal to form the stabilized sorbent. Alumina stabilizers include one or more of silica, lanthana, other rare earths, titania, zirconia and alkaline earths.

Ziebarth, M.S.; Hager, M.J.; Beeckman, J.W.; Plecha, S.

1993-01-19T23:59:59.000Z

162

Compact Potentiometric O2/NOx Sensor | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartmentTieCelebrate Earth Codestheat Two AluminumWHAT:Energy1 DOEO2/NOx

163

Electrochemical NOxSensor for Monitoring Diesel Emissions | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeat PumpRecord ofESPC ENABLE: ECM SummaryandandElectrosynthesisDOEEnergy NOxSensor

164

NOx Adsorber Regeneration Phenomena In Heavy Duty Applications | Department  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXTDevelopment NOx Abatementof

165

NOx Adsorbers for Heavy Duty Truck Engines - Testing and Simulation |  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXTDevelopment NOx

166

NOx Aftertreatment Using Ethanol as Reductant | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXTDevelopment NOxAftertreatment Using

167

An Analysis of PM and NOx Train Emissions in the Alameda Corridor, CA  

E-Print Network [OSTI]

Environment. Estimation of Nitrogen Dioxide Concentrationsmatter, ozone, nitrogen dioxide and sulfur dioxide - Globalnitrate particles and nitrogen dioxide can reduce visibility

Sangkapichai, Mana; Saphores, Jean-Daniel M; Ritchie, Stephen G.; You, Soyoung Iris; Lee, Gunwoo

2008-01-01T23:59:59.000Z

168

Laboratory measurement of secondary pollutant yields from ozone reaction with HVAC filters.  

E-Print Network [OSTI]

from Ozone Reaction with HVAC Filters Hugo Destaillats,from Ozone Reaction with HVAC Filters Hugo Destaillatsfrom Ozone Reaction with HVAC Filters Hugo Destaillats

Destaillats, Hugo

2012-01-01T23:59:59.000Z

169

E-Print Network 3.0 - aura-omi tropospheric ozone Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

atmospheric ozone. The Ozone Monitoring Instrument (OMI) onboard the satellite provides global total column ozone (TCO) and in combination Summary: with other instruments...

170

Experimental and numerical analysis of isothermal turbulent flows in interacting low NOx burners in coal-fired furnaces   

E-Print Network [OSTI]

Coal firing power stations represent the second largest source of global NOx emissions. The current practice of predicting likely exit NOx levels from multi-burner furnaces on the basis of single burner test rig data has been proven inadequate...

Cvoro, Valentina

171

The effect of hydrogen addition on flammability limit and NOx emission in ultra-lean counterflow  

E-Print Network [OSTI]

. They indicated that the addition of hydrogen to natural gas or methane resulted in an increase in NOx for most increases, and then decreases with the increase in the fraction of hydrogen. Overall, hydrogen enrichment rights reserved. Keywords: Hydrogen enrichment; NOx; Extinction limit; Ultra-lean premixed flame. 1

Gülder, �mer L.

172

Effect of propene on the remediation of NOx from engine exhausts  

E-Print Network [OSTI]

been found to play an important role in the NOx conversion chemistry. Earlier studies on the effects to determine their effect on NOx conversion are input energy, gas temperature and the inlet hydrocarbon. Hydrocarbons in the exhausts have been found to play an important role in the reaction chemistry during

Kushner, Mark

173

Global impact of fossil fuel combustion on atmospheric NOx Larry W. Horowitz  

E-Print Network [OSTI]

potential than emissions in the United States to perturb the global oxidizing power of the atmosphere. #12% of NOx concentrations in the lower and middle troposphere throughout the extratropical northern of the ocean. Sources in the United States are found to contribute about half of the fossil fuel NOx over

Jacob, Daniel J.

174

Active NOX Control of Cogen Gas Turbine Exhaust using a Nonlinear Feed Forward with Cascade Architecture  

E-Print Network [OSTI]

Active NOX Control of Cogen Gas Turbine Exhaust using a Nonlinear Feed Forward with Cascade control, cogeneration, gas turbine, model based control, feed forward, cascade ABSTRACT Presented is a model based strategy for controlling the NOX concentration of natural gas turbine emissions

Cooper, Doug

175

Asian emissions of CO and NOx: Constraints from aircraft and Chinese station data  

E-Print Network [OSTI]

and chemistry; KEYWORDS: inversion, Asian emissions, carbon monoxide, nitrogen oxides Citation: Wang, Y. X., MAsian emissions of CO and NOx: Constraints from aircraft and Chinese station data Yuxuan X. Wang to constrain estimates of Asian emissions of CO and NOx. A priori emissions are based on a detailed bottom

Palmer, Paul

176

NOx Dispatching in Plant Utility Systems Using Existing Tools  

E-Print Network [OSTI]

NO x DISPATCHING IN PLANT UTILITY SYSTEMS - USING EXISTING TOOLS Ravi Nath and Jimmy D. Kumana Linnhoff March ABSTRACT Localized NO x reduction during Ozone Alerts is a problem of increasing importance to process industries in and around.... Economic dispatching of plant utility systems is commonly done by the gas and electric power companies and software tools for such dispatching already exist even at the industrial plant level [2]. The purpose of this paper is to show...

Nath, R.; Kumana, J. D.

177

Metal/metal oxide doped oxide catalysts having high deNOx selectivity for lean NOx exhaust aftertreatment systems  

DOE Patents [OSTI]

A lean NOx catalyst and method of preparing the same is disclosed. The lean NOx catalyst includes a ceramic substrate, an oxide support material, preferably .gamma.-alumina, deposited on the substrate and a metal promoter or dopant introduced into the oxide support material. The metal promoters or dopants are selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium, cerium, vanadium, oxides thereof, and combinations thereof. The .gamma.-alumina preferably has a pore volume of from about 0.5 to about 2.0 cc/g; a surface area of between about 80 to 350 m.sup.2 /g; an average pore size diameter of between about 3 to 30 nm; and an impurity level of less than or equal to 0.2 weight percent. In a preferred embodiment the .gamma.-alumina is prepared by a sol-gel method, with the metal doping of the .gamma.-alumina preferably accomplished using an incipient wetness impregnation technique.

Park, Paul W.

2004-03-16T23:59:59.000Z

178

Selective NOx Recirculation for Stationary Lean-Burn Natural Gas Engines  

SciTech Connect (OSTI)

Nitric oxide (NO) and nitrogen dioxide (NO2) generated by internal combustion (IC) engines are implicated in adverse environmental and health effects. Even though lean-burn natural gas engines have traditionally emitted lower oxides of nitrogen (NOx) emissions compared to their diesel counterparts, natural gas engines are being further challenged to reduce NOx emissions to 0.1 g/bhp-hr. The Selective NOx Recirculation (SNR) approach for NOx reduction involves cooling the engine exhaust gas and then adsorbing the NOx from the exhaust stream, followed by the periodic desorption of NOx. By sending the desorbed NOx back into the intake and through the engine, a percentage of the NOx can be decomposed during the combustion process. SNR technology has the support of the Department of Energy (DOE), under the Advanced Reciprocating Engine Systems (ARES) program to reduce NOx emissions to under 0.1 g/bhp-hr from stationary natural gas engines by 2010. The NO decomposition phenomenon was studied using two Cummins L10G natural gas fueled spark-ignited (SI) engines in three experimental campaigns. It was observed that the air/fuel ratio ({lambda}), injected NO quantity, added exhaust gas recirculation (EGR) percentage, and engine operating points affected NOx decomposition rates within the engine. Chemical kinetic model predictions using the software package CHEMKIN were performed to relate the experimental data with established rate and equilibrium models. The model was used to predict NO decomposition during lean-burn, stoichiometric burn, and slightly rich-burn cases with added EGR. NOx decomposition rates were estimated from the model to be from 35 to 42% for the lean-burn cases and from 50 to 70% for the rich-burn cases. The modeling results provided an insight as to how to maximize NOx decomposition rates for the experimental engine. Results from this experiment along with chemical kinetic modeling solutions prompted the investigation of rich-burn operating conditions, with added EGR to prevent preignition. It was observed that the relative air/fuel ratio, injected NO quantity, added EGR fraction, and engine operating points affected the NO decomposition rates. While operating under these modified conditions, the highest NO decomposition rate of 92% was observed. In-cylinder pressure data gathered during the experiments showed minimum deviation from peak pressure as a result of NO injections into the engine. A NOx adsorption system, from Sorbent Technologies, Inc., was integrated with the Cummins engine, comprised a NOx adsorbent chamber, heat exchanger, demister, and a hot air blower. Data were gathered to show the possibility of NOx adsorption from the engine exhaust, and desorption of NOx from the sorbent material. In order to quantify the NOx adsorption/desorption characteristics of the sorbent material, a benchtop adsorption system was constructed. The temperature of this apparatus was controlled while data were gathered on the characteristics of the sorbent material for development of a system model. A simplified linear driving force model was developed to predict NOx adsorption into the sorbent material as cooled exhaust passed over fresh sorbent material. A mass heat transfer analysis was conducted to analyze the possibility of using hot exhaust gas for the desorption process. It was found in the adsorption studies, and through literature review, that NO adsorption was poor when the carrier gas was nitrogen, but that NO in the presence of oxygen was adsorbed at levels exceeding 1% by mass of the sorbent. From the three experimental campaigns, chemical kinetic modeling analysis, and the scaled benchtop NOx adsorption system, an overall SNR system model was developed. An economic analysis was completed, and showed that the system was impractical in cost for small engines, but that economies of scale favored the technology.

Nigel N. Clark

2006-12-31T23:59:59.000Z

179

17 October 2014 Antarctic Ozone Bulletin  

E-Print Network [OSTI]

as measured with an electrochemical ozonesonde on 10 October. One can see two large "bite-outs" of ozone). Ushuaia is marked with a green dot. One can see that Ushuaia is well inside the polar vortex. The PV data

Toohey, Darin W.

180

Ozone treatment of biomass to enhance digestibility  

E-Print Network [OSTI]

is very resistant to enzymatic degradation. Lignocellulosic materials require pretreatment to enhance their digestibility. The main objective of this research was to further enhance the digestibility of biomass (bagasse) with ozonation as a follow...

Almendarez, Maria Elena

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Pinatubo fails to deepen the ozone hole  

SciTech Connect (OSTI)

When the Philippine volcano Pinatubo exploded last year, pumping the upper atmosphere full of find debris, researchers foresaw yet another assault on the stratosphere's beleaguered ozone layer. Some calculations of the effects of volcanic debris implied that as much as 25% to 30% of the ozone shield over temperature latitudes might be eaten away by the volcanic haze - five times the observed loss over the past decade. Early measurements didn't bear out that concern, but researchers weren't prepared to call off the alarm until the verdict came in from the most vulnerable part of the planet's ozone layer, the frigid stratosphere over Antarctica. Although the hole was more extensive than ever before, probably because of unusual weather patterns, total ozone bottomed out well above the record set last year - even a tad above the low levels seen in 1987, 1989, and 1990.

Kerr, R.A.

1992-10-15T23:59:59.000Z

182

Methane production from ozonated pulp mill effluent  

SciTech Connect (OSTI)

A study was made of the production of methane from desugared spent sulfite liquor (SSL) reacted with ozone. The ozonated SSL was fed continuously to three anaerobic fermenters for three months as the sole source of carbon and energy. The fermenters were inoculated with anaerobic bacteria obtained from sewage sludge and acclimated for 1 month in ozonated SSL prior to continuous fermentation. Chemical and biological parameters such as COD, BOD, total sulfur content, redox potential, pH, fatty acid composition, and methane bacteria populations were monitored to determine changes in the SSL during fermentation. Methane production from ozone-treated SSL averaged 1.7 liters/ liter or 17 ml of CH/sub 4/ produced/gram of volatile solids fed. Fatty acis analysis of fermenter effluent indicated a net production of 58 mM/ liter of acetate during ozonated SSL fermentation. This acetic acid production shows future potential for further fermentation by protein-producing yeast. Although the rate of conversion of volatile solids to CH/sub 4/ in this process was not competitive with domestic or agricultural waste digesters, this study did indicate the potential benefits of ozonating organic wastes for increased methane fermentation yields.

Bremmon, C.E.; Jurgensen, M.F.; Patton, J.T.

1980-07-01T23:59:59.000Z

183

Peroxyacetyl Nitrates: Ozone in the cooling PAN  

E-Print Network [OSTI]

automobile exhaust and refineries · Studies suggest that using blended gasoline with ethanol increases PAN; NOx increases with 10% ethanol #12;Reaction Mechanisms · CH3CO-O-O + NO CH3CO-O + NO2 · CH3CO-O CH3

Toohey, Darin W.

184

Low NOx burner retrofits and enhancements for a 518 MW oil and gas fired boiler  

SciTech Connect (OSTI)

Low NOx oil/gas burners originally supplied to Jacksonville Electric Authority, Northside No. 3 .500 MW unit, were based on a duplex air register design with lobed spray oil atomizers providing additional fuel staging. Although the burners could meet the targeted NOx levels of 0.3 and 0.2 lbs/10{sup 6} BTU on oil and gas respectively. There was insufficient margin on these NOx levels to enable continuous low NOx operation to be achieved. Further burner development was undertaken based on improved aerodynamic control within the burner design to give an approximate 25% improvement in NOx emission reduction thus providing an adequate operating margin. This `RoBTAS` (Round Burner with Tilted Air Supply) burner design based on techniques developed successfully for front wall coal firing applications achieved the required NOx reductions in full scale firing demonstrations on both heavy fuel oil and natural gas firing. The paper describes the development work and the subsequent application of the `RoBTAS` burners to the Northside No. 3 boiler. The burner will also be test fired on Orimulsion fuel and thus the comparison between heavy fuel oil firing and Orimulsion firing under ultra low NOx conditions will be made.

King, J.J. [Jacksonville Electric Authority, FL (United States); Allen, J.W.; Beal, P.R. [International Combustion Ltd., Derby (United Kingdom). Rolls-Royce Industrial Power Group

1995-12-31T23:59:59.000Z

185

Low NOx nozzle tip for a pulverized solid fuel furnace  

DOE Patents [OSTI]

A nozzle tip [100] for a pulverized solid fuel pipe nozzle [200] of a pulverized solid fuel-fired furnace includes: a primary air shroud [120] having an inlet [102] and an outlet [104], wherein the inlet [102] receives a fuel flow [230]; and a flow splitter [180] disposed within the primary air shroud [120], wherein the flow splitter disperses particles in the fuel flow [230] to the outlet [104] to provide a fuel flow jet which reduces NOx in the pulverized solid fuel-fired furnace. In alternative embodiments, the flow splitter [180] may be wedge shaped and extend partially or entirely across the outlet [104]. In another alternative embodiment, flow splitter [180] may be moved forward toward the inlet [102] to create a recessed design.

Donais, Richard E; Hellewell, Todd D; Lewis, Robert D; Richards, Galen H; Towle, David P

2014-04-22T23:59:59.000Z

186

NOx Control Options and Integration for US Coal Fired Boilers  

SciTech Connect (OSTI)

This is the fourteenth Quarterly Technical Report for DOE Cooperative Agreement No: DEFC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for boilers firing US coals. The Electric Power Research Institute (EPRI) is providing co-funding for this program. Using the initial CFD baseline modeling of the Gavin Station and the plant corrosion maps, six boiler locations for the corrosion probes were identified and access ports have been installed. Preliminary corrosion data obtained appear consistent and believable. In situ, spectroscopic experiments at BYU reported in part last quarter were completed. New reactor tubes have been made for BYU's CCR that allow for testing smaller amounts of catalyst and thus increasing space velocity; monolith catalysts have been cut and a small reactor that can accommodate these pieces for testing is in its final stages of construction. A poisoning study on Ca-poisoned catalysts was begun this quarter. A possible site for a biomass co-firing test of the slipstream reactor was visited this quarter. The slipstream reactor at Rockport required repair and refurbishment, and will be re-started in the next quarter. This report describes the final results of an experimental project at Brown University on the fundamentals of ammonia / fly ash interactions with relevance to the operation of advanced NOx control technologies such as selective catalytic reduction. The Brown task focused on the measurement of ammonia adsorption isotherms on commercial fly ash samples subjected to a variety of treatments and on the chemistry of dry and semi-dry ammonia removal processes.

Mike Bockelie; Kevin Davis; Temi Linjewile; Connie Senior; Eric Eddings; Kevin Whitty; Larry Baxter; Calvin Bartholomew; William Hecker; Stan Harding; Robert Hurt

2003-12-31T23:59:59.000Z

187

METHANE de-NOX for Utility PC Boilers  

SciTech Connect (OSTI)

The primary focus for the project during the quarter was shakedown testing of the large-scale coal preheater prototype in the CBTF with non-caking PRB coal. Additional pilot-scale tests were conducted in the PSCF in support of developing a preheating system design suitable for use with caking coals. Thirty-two additional pilot tests were conducted during the quarter with caking coal. These tests further evaluated the use of the air-bleed and indirect air-cooled liner designs to reduce or eliminate combustor plugging with caking coal. The air-bleed configurations tested used air injection holes perpendicular to the liner's longitudinal axis with the number, size and air flow though the air-bleed holes varied to determine the effect on combustor plugging. The indirect cooling configurations tested included a stainless steel liner with spiral fins in the annular space between the liner and the combustor wall, and a silicon carbide liner without fins. Continuous pilot operation was maintained for up to 30 minutes at a coal feed rate of 50 lb/h with the air-bleed liner. The best result achieved was for the stainless steel indirect air-cooled liner with 20 minutes of continuous operation at 126 lb/h of coal followed by an additional 20 minutes at 150 lb/h. The NOx results from these continue to indicate that even greater NOx reduction is possible with caking coal than with the PRB coal tested. The installation of the large-scale prototype coal preheater for PRB testing in the CBTF was completed and shakedown testing with natural gas and PRB coal started during the quarter. Stable operation of the coal system, combustor and burner were achieved at coal feed rates up to 6000 lb/h (50 MMBtu/h).

Bruce Bryan; Joseph Rabovitser Serguei Nester; Stan Wohadlo

2004-06-30T23:59:59.000Z

188

Livestock Seasonal Price Variation  

E-Print Network [OSTI]

that number by the index of the future month for which the price forecast is being determined. For example, if June Amarillo direct fed cattle prices averaged $64 per hun- dredweight (cwt.), the forecast for October would be $64 divided by 97.12, multiplied... by 99.04 = $65.27 per cwt. Adjusting for the vari- ability suggests that there is a 68 percent proba- bility that the October monthly average price would fall between $70.67 cwt. and $59.87 cwt. Seasonal Price Index for Amarillo Direct Fed Steers...

Davis, Ernest E.; Sartwelle III, James D.; Mintert, James R.

1999-09-21T23:59:59.000Z

189

Southern Hemisphere Additional Ozonesondes (SHADOZ) 19982000 tropical ozone climatology  

E-Print Network [OSTI]

ozone record from Paramaribo, Surinam (6°N, 55°W) (also in SHADOZ) shows a marked contrast to southern tropical ozone because Surinam is often north of the Intertropical Convergence Zone (ITCZ). A more

Thompson, Anne

190

Concentration of ozone in surface air over greater Boston  

E-Print Network [OSTI]

Surface ozone concentrations were measured in the Greater Boston area from November, 1964 to December, 1965. Ozone was monitored continuosly using a Mast microcoulombmetric sensor. A chromium trioxide filter was fitted to ...

Widen, Donald Allen

1966-01-01T23:59:59.000Z

191

Biomarker Response to Galactic Cosmic Ray-Induced NOx and the Methane Greenhouse Effect in the Atmosphere of an Earthlike Planet Orbiting an M-Dwarf Star  

E-Print Network [OSTI]

Planets orbiting in the habitable zone (HZ) of M-Dwarf stars are subject to high levels of galactic cosmic rays (GCRs) which produce nitrogen oxides in earthlike atmospheres. We investigate to what extent this NOx may modify biomarker compounds such as ozone (O3) and nitrous oxide (N2O), as well as related compounds such as water (H2O) (essential for life) and methane (CH4) (which has both abiotic and biotic sources) . Our model results suggest that such signals are robust, changing in the M-star world atmospheric column by up to 20% due to the GCR NOx effects compared to an M-star run without GCR effects and can therefore survive at least the effects of galactic cosmic rays. We have not however investigated stellar cosmic rays here. CH4 levels are about 10 times higher than on the Earth related to a lowering in hydroxyl (OH) in response to changes in UV. The increase is less than reported in previous studies. This difference arose partly because we used different biogenic input. For example, we employed 23% lower CH4 fluxes compared to those studies. Unlike on the Earth, relatively modest changes in these fluxes can lead to larger changes in the concentrations of biomarker and related species on the M-star world. We calculate a CH4 greenhouse heating effect of up to 4K. O3 photochemistry in terms of the smog mechanism and the catalytic loss cycles on the M-star world differs considerably compared with the Earth.

John Lee Grenfell; Jean-Mathias Griessmeier; Beate Patzer; Heike Rauer; Antigona Segura; Anja Stadelmann; Barbara Stracke; Ruth Titz; Philip von Paris

2007-02-23T23:59:59.000Z

192

A design strategy applied to sulfur resistant lean NOx̳ automotive catalysts  

E-Print Network [OSTI]

Catalyst poisoning due to sulfur compounds derived from fuel sulfur presents a major challenge, intractable thus far, to development of many advanced technologies for automotive catalysts such as the lean NOx, trap. Under ...

Tang, Hairong

2005-01-01T23:59:59.000Z

193

APBF-DEC Light-duty NOx Adsorber/DPF Project  

Broader source: Energy.gov (indexed) [DOE]

emission standards, the goal of this project is Tier 2 - BIN 5 limits of 0.07 gmi NOx and 0.01 gmi PM. Additionally, HC and CO emissions standards must be met....

194

Non-thermal plasma-assisted NOx reduction over Na-Y zeolites...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

investigated in the non-thermal plasma assisted NOx reduction reaction using a simulated diesel engine exhaust gas mixture. The acid sites were formed by NH4+ ion exchange and...

195

APBF-DEC NOx Adsorber/DPF Project: SUV/Pick-Up Platform  

Broader source: Energy.gov (indexed) [DOE]

Status Principal Investigators: Cynthia Webb Phillip Weber DEER August 25, 2003 APBF-DEC NOx AdsorberDPF Project: SUVPick-Up Platform Program Goals Objectives Light-Duty SUV ...

196

Climate Co-benefits of Tighter SO2 and NOx Regulations in China  

E-Print Network [OSTI]

Air pollution has been recognized as a significant problem in China. In its Twelfth Five Year Plan (FYP), China proposes to reduce SO2 and NOx emissions significantly, and here we investigate the cost of achieving those ...

Nam, Kyung-Min

2012-10-01T23:59:59.000Z

197

Water-induced morphology changes in BaO/?-Al2O3 NOx storage...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

materials: an FTIR, TPD, and time-resolved synchrotron XRD Water-induced morphology changes in BaO?-Al2O3 NOx storage materials: an FTIR, TPD, and time-resolved synchrotron...

198

Combining Low-Temperature Combustion with Lean-NOx Trap Yields...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

and Posters 2005deerhuff.pdf More Documents & Publications Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Reductant Utilization in a LNT + SCR...

199

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study...  

Broader source: Energy.gov (indexed) [DOE]

Intra-catalyst Reductant Chemistry in Lean NOx Traps: A Study on Sulfur Effects Jim Parks (parksjeii@ornl.gov), Matt Swartz, Shean Huff, Brian West Oak Ridge National Laboratory...

200

NH3 generation over commercial Three-Way Catalysts and Lean-NOx...  

Broader source: Energy.gov (indexed) [DOE]

Gasoline Emissions Control: NH 3 generation over commercial Three-Way Catalysts and Lean-NOx Traps Todd J. Toops, James E. Parks II and Josh A. Pihl Oak Ridge National Laboratory...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Simultaneously Low-Engine-Out NOx and PM with Highly Diluted...  

Broader source: Energy.gov (indexed) [DOE]

Simultaneous Low-Engine-Out NOx and PM with Highly Diluted Diesel Combustion Robert M. Wagner, Johney B. Green, Thang Q. Dam, K. Dean Edwards, John M. Storey Oak Ridge National...

202

Consequences of propene and propane on plasma remediation of NOx Rajesh Doraia)  

E-Print Network [OSTI]

Consequences of propene and propane on plasma remediation of NOx Rajesh Doraia) Department exhausts with hydrocarbons propane (C3H8) and propene (C3H6) has been investigated. In general

Kushner, Mark

203

The impact of interannual variability on multidecadal total ozone simulations  

E-Print Network [OSTI]

to reinforce the chemical ozone depletion caused by the enhanced aerosol loading following the eruption of Mt

Jackman, Charles H.

204

Ozone treatment in a closed culture system for Macrobrachium rosenbergii  

E-Print Network [OSTI]

constant flow of air. The Orthotoridine-Manganese Method (OTM) wss employed to measure ozone in solution (APHA, 1976) . Because of the rapid rate of decomposition of ozone in water, it was determined that the production of ozone could not be measured... by introducing into water and then sampling that water for analysis with OTM. Therefore, ozone was introduced directly into a solution of OTM reagent with subsequent changes in color of the reagent, measured on a "B & L Spectronic 70" spectrophotometer, being...

Yamaguchi, Ryoji

1978-01-01T23:59:59.000Z

205

Seasonal Variability in Anthropogenic Halocarbon  

E-Print Network [OSTI]

ozone depleting potential and as hazards to human health, they are also of concern due to their positive banned by the Montreal Protocol with a minimal number of exceptions for critical purposes in a few-12). For example, studies measuring halocarbons in off-gas from municipal solid waste (MSW) landfills report

Cohen, Ronald C.

206

A study of the effect of ozone and antioxidants on ozone-sensitive loblolly pine  

E-Print Network [OSTI]

and exposed to LSX ambient ozone for two months. Arrows indicate pestained SDS-PAGE molecular weight standards (kD) and Rubisco large subunit. Lane R = pure spinach Rubisco large subunit. Lanes 1 and 2 = control seedlings in the Ozoban study. Lanes 3 and 4... radicals are produced during normal metabolism when oxygen is reduced to water. Grimes et al. (1983) studied the products that form from ozone in cells and found no detectable superoxide radicals, leading them to propose that either ozone or hydroxyl...

Posey, Karen Lashea

1995-01-01T23:59:59.000Z

207

Climatological simulations of ozone and atmospheric aerosols in the Greater Cairo region  

SciTech Connect (OSTI)

An integrated chemistry-climate model (RegCM4-CHEM) simulates present-day climate, ozone and tropospheric aerosols over Egypt with a focus on Greater Cairo (GC) region. The densley populated GC region is known for its severe air quality issues driven by high levels of anthropogenic pollution in conjuction with natural sources such as dust and agricultural burning events. We find that current global emission inventories underestimate key pollutants such as nitrogen oxides and anthropogenic aerosol species. In the GC region, average-ground-based NO2 observations of 40-60 ppb are substantially higher than modeled estimates (5-10 ppb), likely due to model grid resolution, improper boundary layer representation, and poor emissions inventories. Observed ozone concentrations range from 35 ppb (winter) to 80 ppb (summer). The model reproduces the seasonal cycle fairly well, but modeled summer ozone is understimated by approximately 15 ppb and exhibits little interannual variability. For aerosols, springtime dust events dominate the seasonal aerosol cycle. The chemistry-climate model captures the springtime peak aerosol optical depth (AOD) of 0.7-1 but is slightly greater than satellite-derived AOD. Observed AOD decreases in the summer and increases again in the fall due to agricultural burning events in the Nile Delta, yet the model underestimates this fall observed AOD peak, as standard emissions inventories underestimate this burning and the resulting aerosol emissions. Our comparison of modeled gas and particulate phase atmospheric chemistry in the GC region indicates that improved emissions inventories of mobile sources and other anthropogenic activities are needed to improve air quality simulations in this region.

Steiner, A. L.; Tawfik, A. B.; Shalaby, A.; Zakey, A. S.; Abdel Wahab, M. M.; Salah, Z.; Solmon, F.; Sillman, S.; Zaveri, Rahul A.

2014-04-16T23:59:59.000Z

208

Ozone determination in different copying centers  

E-Print Network [OSTI]

&ixicolr&gi 1st ed. , New York. Hemisphere Publishing Corp, 1 987, ppl35-13(? 12. Menzel, D. B. : Toxicity of Ozone, Oxygen and Radiation. AI111 Rev. of Pharmacol. 1970; 10: 37&)-394. 13. Menzel, D. B. : Ozone: An overview of its toxicity in m;in . in...-Threshold Limit Values for Chemi?;il Substances and Physical Agents in the Work Environm?ni 1991-1992. Cincinnati, Ohio: ACGIH 1991 24. Wadden, R. A. , and P. A. Scheff: /ndoor At't Pollt&ttr ii l si ?d New York: John Wiley & Sons, inc. , 1983, ppl-5. 25...

Lai, Chen-Fu

1993-01-01T23:59:59.000Z

209

Release of Ammonium and Mercury from NOx Controlled Fly Ash  

SciTech Connect (OSTI)

One of the goals of the Department of Energy is to increase the reuse of coal utilization byproducts (CUB) to 50% by 2010. This will require both developing new markets and maintaining traditional ones such as the use of fly ash in concrete. However, the addition of pollution control devices can introduce side-effects that affect the marketability of the CUB. Such can be the case when NOx control is achieved using selective catalytic or non-catalytic reduction (SCR or SNCR). Depending on site-specific details, the ammonia slip can cause elevated levels of NH3 in the fly ash. Disposal of ammoniated fly ash can present environmental concerns related to the amount of ammonia that might be released, the amount of water that might become contaminated, and the extent to which metals might be mobilized by the presence of the ammonia. Ammonia retained in fly ash appears to be present as either an ammonium salt or as a chemisorbed species. Mercury in the leachates correlated to neither the amount of leachable ammonium nor to the total amount of Hg in the ash. The strongest correlation was between the decreases in the amount of Hg leached with increased LOI.

Schroeder, K.T.; Cardone, C.R.; Kim, A.G

2007-07-01T23:59:59.000Z

210

Method of preparing doped oxide catalysts for lean NOx exhaust  

DOE Patents [OSTI]

The lean NOx catalyst includes a substrate, an oxide support material, preferably .gamma.-alumina deposited on the substrate and a metal or metal oxide promoter or dopant introduced into the oxide support material. The metal promoters or dopants are selected from the group consisting of indium, gallium, tin, silver, germanium, gold, nickel, cobalt, copper, iron, manganese, molybdenum, chromium cerium, and vanadium, and oxides thereof, and any combinations thereof. The .gamma.-alumina preferably has a pore volume of from about 0.5 to about 2.0 cc/g; a surface area of between 80 and 350 m.sup.2 /g; an average pore size diameter of between about 3 to 30 nm; and an impurity level of less than or equal to about 0.2 weight percent. In a preferred embodiment the .gamma.-alumina is prepared by a sol-gel method, with the metal doping of the .gamma.-alumina preferably accomplished using an incipient wetness impregnation technique.

Park, Paul W.

2004-03-09T23:59:59.000Z

211

Discovery of New NOx Reduction Catalysts for CIDI Engines Using Combinatorial Techniques  

SciTech Connect (OSTI)

This project for the discovery of new lean reduction NOx catalysts was initiated on August 16th, 2002 and is now into its fourth year. Several materials have already been identified as NOx reduction catalysts for possible future application. NOx reduction catalysts are a critical need in the North American vehicle market since these catalysts are needed to enable both diesels and lean gasoline engines to meet the 2007-2010 emission standards. Hydrocarbon selective catalytic reduction (SCR) is a preferred technology since it requires no infrastructure changes (as may be expected for urea SCR) and most likely has the simplest engine control strategy of the three proposed NOx reduction approaches. The use of fast throughput techniques and informatics greatly enhances the possibility of discovering new NOx reduction catalysts. Using fast throughput techniques this project has already screened over 3000 new materials and evaluates hundreds of new materials a month. Evaluating such a high number of new materials puts this approach into a very different paradigm than previous discovery approaches for new NOx reduction catalysts. With so much data on materials it is necessary to use statistical techniques to identify the potential catalysts and these statistical techniques are needed to optimize compositions of the multi-component materials that are identified under the program as possible new lean NOx catalysts. Several new materials have conversions in excess of 80% at temperatures above 300 C. That is more than twice the activity of previous HC SCR materials. These materials are candidates for emission control on heavy-duty systems (i.e.; over 8500 pounds gross weight). Tests of one of the downselected materials on an engine dynamometer show NOx reductions greater than 80% under some conditions even though the net NOx reductions on the HWFET and the US06 cycles were relatively low. The program is scheduled to continue until the end of the 2006 calendar year. Work in the final year will focus on continued discovery and identity of candidate materials, and also on refining the engine operating strategies to increase NOx reduction over a full engine cycle.

Blint, Richard J

2005-08-15T23:59:59.000Z

212

Selective NOx Recirculation for Stationary Lean-Burn Natural Gas Engines  

SciTech Connect (OSTI)

Selective NOx Recirculation (SNR) involves cooling the engine exhaust gas and then adsorbing the oxides of nitrogen (NOx) from the exhaust stream, followed by the periodic desorption of NOx. By returning the desorbed, concentrated NOx into the engine intake and through the combustion chamber, a percentage of the NOx is decomposed during the combustion process. An initial study of NOx decomposition during lean-burn combustion was concluded in 2004 using a 1993 Cummins L10G 240hp natural gas engine. It was observed that the air/fuel ratio, injected NO (nitric oxide) quantity and engine operating points affected NOx decomposition rates of the engine. Chemical kinetic modeling results were also used to determine optimum NOx decomposition operating points and were published in the 2004 annual report. A NOx decomposition rate of 27% was measured from this engine under lean-burn conditions while the software model predicted between 35-42% NOx decomposition for similar conditions. A later technology 1998 Cummins L10G 280hp natural gas engine was procured with the assistance of Cummins Inc. to replace the previous engine used for 2005 experimental research. The new engine was equipped with an electronic fuel management system with closed-loop control that provided a more stable air/fuel ratio control and improved the repeatability of the tests. The engine was instrumented with an in-cylinder pressure measurement system and electronic controls, and was adapted to operate over a range of air/fuel ratios. The engine was connected to a newly commissioned 300hp alternating current (AC) motoring dynamometer. The second experimental campaign was performed to acquire both stoichiometric and slightly rich (0.97 lambda ratio) burn NOx decomposition rates. Effects of engine load and speed on decomposition were quantified, but Exhaust Gas Recirculation (EGR) was not varied independently. Decomposition rates of up to 92% were demonstrated. Following recommendations at the 2004 ARES peer review meeting at Argonne National Laboratories, in-cylinder pressure was measured to calculate engine indicated mean effective pressure (IMEP) changes due to NOx injections and EGR variations, and to observe conditions in the cylinder. The third experimental campaign gathered NOx decomposition data at 800, 1200 and 1800 rpm. EGR was added via an external loop, with EGR ranging from zero to the point of misfire. The air/fuel ratio was set at both stoichiometric and slightly rich conditions, and NOx decomposition rates were calculated for each set of runs. Modifications were made to the engine exhaust manifold to record individual exhaust temperatures. The three experimental campaigns have provided the data needed for a comprehensive model of NOx decomposition during the combustion process, and data have confirmed that there was no significant impact of injected NO on in-cylinder pressure. The NOx adsorption system provided by Sorbent Technologies Corp. (Twinsburg, OH), comprised a NOx adsorber, heat exchanger and a demister. These components were connected to the engine, and data were gathered to show both the adsorption of NOx from the engine, and desorption of NOx from the carbon-based sorbent material back into the engine intake, using a heated air stream. In order to quantify the NOx adsorption/desorption characteristics of the sorbent material, a bench top adsorption system was constructed and instrumented with thermocouples and the system output was fed into a NOx analyzer. The temperature of this apparatus was controlled while gathering data on the characteristics of the sorbent material. These data were required for development of a system model. Preliminary data were gathered in 2005, and will continue in early 2006. To assess the economic benefits of the proposed SNR technology the WVU research team has been joined in the last quarter by Dr Richard Turton (WVU-Chemical Engineering), who is modeling, sizing and costing the major components. The tasks will address modeling and preliminary design of the heat exchanger, demister and NOx sorbent chamber s

Nigel Clark; Gregory Thompson; Richard Atkinson; Richard Turton; Chamila Tissera; Emre Tatli; Andy Zimmerman

2005-12-28T23:59:59.000Z

213

Regional-seasonal weather forecasting  

SciTech Connect (OSTI)

In the interest of allocating heating fuels optimally, the state-of-the-art for seasonal weather forecasting is reviewed. A model using an enormous data base of past weather data is contemplated to improve seasonal forecasts, but present skills do not make that practicable. 90 references. (PSB)

Abarbanel, H.; Foley, H.; MacDonald, G.; Rothaus, O.; Rudermann, M.; Vesecky, J.

1980-08-01T23:59:59.000Z

214

Cyclone Boiler Field Testing of Advanced Layered NOx Control Technology in Sioux Unit 1  

SciTech Connect (OSTI)

A four week testing program was completed during this project to assess the ability of the combination of deep staging, Rich Reagent Injection (RRI), and Selective Non-Catalytic Reduction (SNCR) to reduce NOx emissions below 0.15 lb/MBtu in a cyclone fired boiler. The host site for the tests was AmerenUE's Sioux Unit 1, a 500 MW cyclone fired boiler located near St. Louis, MO. Reaction Engineering International (REI) led the project team including AmerenUE, FuelTech Inc., and the Electric Power Research Institute (EPRI). This layered approach to NOx reduction is termed the Advanced Layered Technology Approach (ALTA). Installed RRI and SNCR port locations were guided by computational fluid dynamics (CFD) based modeling conducted by REI. During the parametric testing, NOx emissions of 0.12 lb/MBtu were achieved consistently from overfire air (OFA)-only baseline NOx emissions of 0.25 lb/MBtu or less, when firing the typical 80/20 fuel blend of Powder River Basin (PRB) and Illinois No.6 coals. From OFA-only baseline levels of 0.20 lb/MBtu, NOx emissions of 0.12 lb/MBtu were also achieved, but at significantly reduced urea flow rates. Under the deeply staged conditions that were tested, RRI performance was observed to degrade as higher blends of Illinois No.6 were used. NOx emissions achieved with ALTA while firing a 60/40 blend were approximately 0.15 lb/MBtu. NOx emissions while firing 100% Illinois No.6 were approximately 0.165 lb/MBtu. Based on the performance results of these tests, economics analyses of the application of ALTA to a nominal 500 MW cyclone unit show that the levelized cost to achieve 0.15 lb/MBtu is well below 75% of the cost of a state of the art SCR.

Marc A. Cremer; Bradley R. Adams

2006-06-30T23:59:59.000Z

215

Nuclear conflict and ozone depletion Quick summary  

E-Print Network [OSTI]

Nuclear conflict and ozone depletion Quick summary o Regional nuclear war could cause global which traps pollutants o Nuclear weapons cause explosions, which then causes things around the vicinity to start burning, which in turn releases black carbon; it is not the nuclear material or fallout causing

Toohey, Darin W.

216

Two-stage Catalytic Reduction of NOx with Hydrocarbons  

SciTech Connect (OSTI)

A two-stage system for the catalytic reduction of NO from lean-burn natural gas reciprocating engine exhaust is investigated. Each of the two stages uses a distinct catalyst. The first stage is oxidation of NO to NO{sub 2} and the second stage is reduction of NO{sub 2} to N{sub 2} with a hydrocarbon. The central idea is that since NO{sub 2} is a more easily reduced species than NO, it should be better able to compete with oxygen for the combustion reaction of hydrocarbon, which is a challenge in lean conditions. Early work focused on demonstrating that the N{sub 2} yield obtained when NO{sub 2} was reduced was greater than when NO was reduced. NO{sub 2} reduction catalysts were designed and silver supported on alumina (Ag/Al{sub 2}O{sub 3}) was found to be quite active, able to achieve 95% N{sub 2} yield in 10% O{sub 2} using propane as the reducing agent. The design of a catalyst for NO oxidation was also investigated, and a Co/TiO{sub 2} catalyst prepared by sol-gel was shown to have high activity for the reaction, able to reach equilibrium conversion of 80% at 300 C at GHSV of 50,000h{sup -1}. After it was shown that NO{sub 2} could be more easily reduced to N{sub 2} than NO, the focus shifted on developing a catalyst that could use methane as the reducing agent. The Ag/Al{sub 2}O{sub 3} catalyst was tested and found to be inactive for NOx reduction with methane. Through iterative catalyst design, a palladium-based catalyst on a sulfated-zirconia support (Pd/SZ) was synthesized and shown to be able to selectively reduce NO{sub 2} in lean conditions using methane. Development of catalysts for the oxidation reaction also continued and higher activity, as well as stability in 10% water, was observed on a Co/ZrO{sub 2} catalyst, which reached equilibrium conversion of 94% at 250 C at the same GHSV. The Co/ZrO{sub 2} catalyst was also found to be extremely active for oxidation of CO, ethane, and propane, which could potential eliminate the need for any separate oxidation catalyst. At every stage, catalyst synthesis was guided by the insights gained through detailed characterization of the catalysts using many surface and bulk analysis techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, Temperature-programmed Reduction, Temperature programmed Desorption, and Diffuse Reflectance InfraRed Fourier Transform Spectroscopy as well as steady state reaction experiments. Once active catalysts for each stage had been developed, a physical mixture of the two catalysts was tested for the reduction of NO with methane in lean conditions. These experiments using a mixture of the catalysts produced N2 yields as high as 90%. In the presence of 10% water, the catalyst mixture produced 75% N{sub 2} yield, without any optimization. The dual catalyst system developed has the potential to be implemented in lean-burn natural gas engines for reducing NOx in lean exhaust as well as eliminating CO and unburned hydrocarbons without any fuel penalty or any system modifications. If funding continues, future work will focus on improving the hydrothermal stability of the system to bring the technology closer to application.

Umit S. Ozkan; Erik M. Holmgreen; Matthew M. Yung; Jonathan Halter; Joel Hiltner

2005-12-21T23:59:59.000Z

217

NOx Control Options and Integration for US Coal Fired Boilers  

SciTech Connect (OSTI)

This is the sixteenth Quarterly Technical Report for DOE Cooperative Agreement No: DEFC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for boilers firing US coals. The Electric Power Research Institute (EPRI) is providing co-funding for this program. During an unplanned outage, damage occurred to the electrochemical noise corrosion probes installed at the AEP Gavin plant; testing is expected to resume in August. The KEMCOP corrosion coupons were not affected by the unplanned outage; the coupons were removed and sent for analysis. BYU conducted a series of tests before the ISSR lab was relocated. Ammonia adsorption experiments provided clear evidence of the types of acidic sites present on catalyst surfaces. Data collected this quarter indicate that surface sulfation decreases Lewis acid site concentrations for all catalysts thus far studied, confirming that catalytic activity under commercial coal-based SCR conditions occurs primarily on Br{o}nsted acid sites and would be susceptible to basic impurities such as alkali and alkaline earth oxides, chlorides, and sulfates. SCR activity tests based on MS analysis showed that increasing sulfation generally increases NO reduction activity for both 0% and 1% vanadia catalysts. During this quarter, the slipstream reactor at Rockport operated for 720 hours on flue gas. Catalyst exposure time reached 4500 hours since installation. The reactor is out of service at the Rockport plant and plans are being made to move it to the Gadsden Plant. At Gadsden, modifications have begun in preparation for installation of the slipstream reactor next quarter.

Mike Bockelie; Kevin Davis; Temi Linjewile; Connie Senior; Eric Eddings; Kevin Whitty; Larry Baxter; Calvin Bartholomew; William Hecker; Stan Harding

2004-06-30T23:59:59.000Z

218

NOx CONTROL OPTIONS AND INTEGRATION FOR US COAL FIRED BOILERS  

SciTech Connect (OSTI)

This is the sixth Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for firing US coals. The Electric Power Research Institute (EPRI) is providing co-funding for this program. This program contains multiple tasks and good progress is being made on all fronts. Preliminary results from laboratory and field tests of a corrosion probe to predict waterwall wastage indicate good agreement between the electrochemical noise corrosion rates predicted by the probe and corrosion rates measured by a surface profilometer. Four commercial manufacturers agreed to provide catalyst samples to the program. BYU has prepared two V/Ti oxide catalysts (custom, powder form) containing commercially relevant concentrations of V oxide and one containing a W oxide promoter. Two pieces of experimental apparatus being built at BYU to carry out laboratory-scale investigations of SCR catalyst deactivation are nearly completed. A decision was made to carry out the testing at full-scale power plants using a slipstream of gas instead of at the University of Utah pilot-scale coal combustor as originally planned. Design of the multi-catalyst slipstream reactor was completed during this quarter. One utility has expressed interest in hosting a long-term test at one of their plants that co-fire wood with coal. Tests to study ammonia adsorption onto fly ash have clearly established that the only routes that can play a role in binding significant amounts of ammonia to the ash surface, under practical ammonia slip conditions, are those that must involve co-adsorbates.

Mike Bockelie; Marc Cremer; Kevin Davis; Connie Senior; Bob Hurt; Eric Suuberg; Eric Eddings; Larry Baxter

2002-01-31T23:59:59.000Z

219

Turbulent Flame Speeds and NOx Kinetics of HHC Fuels with Contaminants and High Dilution Levels  

SciTech Connect (OSTI)

This final report documents the technical results of the 3-year project entitled, “Turbulent Flame Speeds and NOx Kinetics of HHC Fuels with Contaminants and High Dilution Levels,” funded under the NETL of DOE. The research was conducted under six main tasks: 1) program management and planning; 2) turbulent flame speed measurements of syngas mixtures; 3) laminar flame speed measurements with diluents; 4) NOx mechanism validation experiments; 5) fundamental NOx kinetics; and 6) the effect of impurities on NOx kinetics. Experiments were performed using primary constant-volume vessels for laminar and turbulent flame speeds and shock tubes for ignition delay times and species concentrations. In addition to the existing shock- tube and flame speed facilities, a new capability in measuring turbulent flame speeds was developed under this grant. Other highlights include an improved NOx kinetics mechanism; a database on syngas blends for real fuel mixtures with and without impurities; an improved hydrogen sulfide mechanism; an improved ammonia kintics mechanism; laminar flame speed data at high pressures with water addition; and the development of an inexpensive absorption spectroscopy diagnostic for shock-tube measurements of OH time histories. The Project Results for this work can be divided into 13 major sections, which form the basis of this report. These 13 topics are divided into the five areas: 1) laminar flame speeds; 2) Nitrogen Oxide and Ammonia chemical kinetics; 3) syngas impurities chemical kinetics; 4) turbulent flame speeds; and 5) OH absorption measurements for chemical kinetics.

Peterson, Eric; Krejci, Michael; Mathieu, Olivier; Vissotski, Andrew; Ravi, Sankat; Plichta, Drew; Sikes, Travis; Levacque, Anthony; Camou, Alejandro; Aul, Christopher

2013-09-30T23:59:59.000Z

220

Sandia National Laboratories: Understanding Seasonal Effects...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Modeling & SimulationUnderstanding Seasonal Effects of WEC Operation using the SNL-SWAN Wave Model Application Understanding Seasonal Effects of WEC Operation using the SNL-SWAN...

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Retrieval of ozone and nitrogen dioxide concentrations from Stratospheric Aerosol and Gas Experiment III (SAGE III)  

E-Print Network [OSTI]

Retrieval of ozone and nitrogen dioxide concentrations from Stratospheric Aerosol and Gas extinction. We retrieve ozone and nitrogen dioxide number densities and aerosol extinction from transmission), Retrieval of ozone and nitrogen dioxide concentrations from Stratospheric Aerosol and Gas Experiment III

222

Satellite observations of ozone and nitrogen dioxide: from retrievals to emission estimates  

E-Print Network [OSTI]

Satellite observations of ozone and nitrogen dioxide: from retrievals to emission estimates #12 Satellite observations of ozone and nitrogen dioxide: from retrievals to emission es- timates / by Bas Subject headings: satellite retrieval / nitrogen dioxide / ozone / air pollution / emis- sion estimates

Haak, Hein

223

Application of gaseous disinfectants ozone and chlorine dioxide for inactivation of Bacillus subtilis spores  

E-Print Network [OSTI]

inhibitor line Ozone Generator Oxygen Concentrator CellSequal oxygen concentrator and Pure-O-Tech ozone generator.This oxygen is then supplied into the ozone generator for

Aydogan, Ahmet

2006-01-01T23:59:59.000Z

224

Exhaust gas fuel reforming of Diesel fuel by non-thermal arc discharge for NOx trap regeneration  

E-Print Network [OSTI]

1 Exhaust gas fuel reforming of Diesel fuel by non- thermal arc discharge for NOx trap regeneration to the reforming of Diesel fuel with Diesel engine exhaust gas using a non-thermal plasma torch for NOx trap Diesel fuel reforming with hal-00617141,version1-17May2013 Author manuscript, published in "Energy

Boyer, Edmond

225

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls and Implications for Global Emission  

E-Print Network [OSTI]

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls from coal-fired power plants in the U.S. at typical operating conditions with and without the presence this, a novel method for collection and isotopic analysis of coal-fired stack NOx emission samples

Elliott, Emily M.

226

Ozone chemistry in the smoke from the Kuwait oil fires  

SciTech Connect (OSTI)

Ozone depletion occurred in the core of the plume of smoke from the Kuwait oil fires within 100 km of the fires, primarily in regions where NO{sub x} concentrations were high and ultraviolet flux was near zero. Rapid conversion of NO to NO{sub 2} can explain almost all of the ozone loss. Ozone was produced in diffuse regions of the plume, where the ultraviolet flux was higher than in the core. However, due to the relatively high ratio of nonmethane hydrocarbons to NO{sub x}, ozone production was slow. Since ozone was produced in a much larger volume than it was depleted, the plume as a whole was a source of ozone on a regional scale. 27 refs., 4 figs., 1 tab.

Herring, J.A.; Hobbs, P.V. [Univ. of Washington, Seattle, WA (United States)

1992-09-20T23:59:59.000Z

227

Ozone Removal by Filters Containing Activated Carbon: A Pilot Study  

SciTech Connect (OSTI)

This study evaluated the ozone removal performance of moderate-cost particle filters containing activated carbon when installed in a commercial building heating, ventilating, and air conditioning (HVAC) system. Filters containing 300 g of activated carbon per 0.09 m2 of filter face area were installed in two 'experimental' filter banks within an office building located in Sacramento, CA. The ozone removal performance of the filters was assessed through periodic measurements of ozone concentrations in the air upstream and downstream of the filters. Ozone concentrations were also measured upstream and downstream of a 'reference' filter bank containing filters without any activated carbon. The filter banks with prefilters containing activated carbon were removing 60percent to 70percent of the ozone 67 and 81 days after filter installation. In contrast, there was negligible ozone removal by the reference filter bank without activated carbon.

Fisk, William; Spears, Mike; Sullivan, Douglas; Mendell, Mark

2009-09-01T23:59:59.000Z

228

airborne antarctic ozone: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

winter weather conditions: Severe cold and isolated air ow: circumpolar vortex North pole vortex breakdown replenishes ozone layer from outside: mixes air 12; E11;ects...

229

antarctic ozone recovery: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

winter weather conditions: Severe cold and isolated air ow: circumpolar vortex North pole vortex breakdown replenishes ozone layer from outside: mixes air 12; E11;ects...

230

antarctic ozone hole: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

winter weather conditions: Severe cold and isolated air ow: circumpolar vortex North pole vortex breakdown replenishes ozone layer from outside: mixes air 12; E11;ects...

231

antarctic ozone experiment: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

winter weather conditions: Severe cold and isolated air ow: circumpolar vortex North pole vortex breakdown replenishes ozone layer from outside: mixes air 12; E11;ects...

232

antarctic ozone depletion: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

winter weather conditions: Severe cold and isolated air ow: circumpolar vortex North pole vortex breakdown replenishes ozone layer from outside: mixes air 12; E11;ects...

233

Exposure-Relevant Ozone Chemistry in Occupied Spaces  

E-Print Network [OSTI]

from the material balance on ozone (equation 4-1). S [O 3 ](equation 5-2, which reflects a steady-state material balance

Coleman, Beverly Kaye

2009-01-01T23:59:59.000Z

234

Ozone heating and the destabilization of traveling waves during summer  

SciTech Connect (OSTI)

The effects of ozone heating on the linear stability of lower stratospheric traveling waves of the summertime, extratropical circulation are examined. Based on coupled equations for the quasigeostrophic potential vorticity and ozone volume mixing ratio, it is shown that the diabatic heating arising from ozone advection can offset the damping due to Newtonian cooling, leading to wave amplification and significant changes in the structure and zonally rectified fluxes of the wave fields in both the lower stratosphere and troposphere. The vertical profile of the zonal mean wind plays a crucial role in determining whether the ozone heating destabilizes eastward and/or westward traveling disturbances.

Nathan, T.R.; Cordero, E.C.; Li, L. [Univ. of California, Davis, CA (United States)] [Univ. of California, Davis, CA (United States)

1994-07-01T23:59:59.000Z

235

E-Print Network 3.0 - ambient ozone levels Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

level ozone. Lesson 2: Ozone Formation... , power plants and industry all emit air pollution that forms ... Source: Royer, Dana - Department of Earth and Environmental Sciences,...

236

E-Print Network 3.0 - ash ozonation technology Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ozonation technology Search Powered by Explorit Topic List Advanced Search Sample search results for: ash ozonation technology Page: << < 1 2 3 4 5 > >> 1 Fine volcanic Predicting...

237

E-Print Network 3.0 - ambient ozone growth Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Climate and Environment (Climate) Impacts of ozone on trees and crops Summary: and carbon sequestration. Vegetation exposure to ozone reduces photosynthesis, growth, and...

238

Methane de-NOX for Utility PC Boilers  

SciTech Connect (OSTI)

Large-scale combustion tests with caking bituminous coal was on hold this quarter mainly due to Riley's Commercial Burner Test Facility (CBTF) not having adequate weatherproofing to support operation under freezing conditions. The CBTF was secured and decommissioned for the winter season. CBTF bituminous coal tests shall continue to remain on hold now as a result of project funding limitations, however. No further modifications at the CBTF are planned until needed support is obtained. Activities this quarter have concentrated on finding additional support for the project. Currently, GTI has been granted a no-cost time extension through September 2005 and efforts to secure more support will continue in hopes that large-scale preheat caking bituminous combustion tests will be carried out as planned.

Bruce Bryan; Joseph Rabovitser; Serguei Nester; Stan Wohadlo

2005-03-31T23:59:59.000Z

239

The NOx system in nuclear waste. 1997 annual progress report  

SciTech Connect (OSTI)

'The authors highlight their results from the title project. The project is a coordinated effort of the three Co-PIs to assist the Safety Programs at the Hanford and other DOE Environmental Management Sites. The authors present in the report their observations and interactively discuss their implications for safety concerns. They focus on three issues: (1) Reducing radicals in the NOx system The authors show that the only reducing radical that lasts longer than a few ns in typical waste solutions, and is capable of generating hydrogen, is NO{sub 3}{sup 2-}. The authors measured the lifetime of this species across the whole pH range (3 {le} pH {le} 14) and found it to be shorter than -15 \\265s, before it dissociates to give the strongly oxidizing NO, radicals. They found that it reacts with many proton donors (H{sup +}, phosphate, borate, NH{prime}, amines) in a reaction that is not merely an acid-base equilibrium reaction but is probably a dissociative proton transfer. They estimate the redox potential from theoretical considerations and obtain an experimental verification. They conclude that it is highly unlikely, although thermodynamically possible, that this radi-cal will generate hydrogen in waste solutions. (2) Aging of organic chelators and their degradation products by NO, Methodologies to study the degradation of organic substrates (including the important waste components, formate and oxalate) to CO;, or carbonate, by NO, were developed. This radical dimerizes and disproportionates to nitrate and nitrite. Therefore, mineraliza-tion of the organic substrates competes with the disproportionation of NO,. Among the organic substrates, formate and oxalate are also mineralized but because they are of low fuel value their mineralization is not very helpful, yet it consumes NO,. (3) Interfacial processes in aqueous suspensions Yields of charge transfer from solid silica particles to water and other liquids were meas-ured. If the particles are small enough, essentially all of the charge that is originally depos-ited in the solid escapes into the liquid. This implies that the solid/liquid interface does not provide a significant barrier to the transfer of charges into the solution when the particles are very small (I 20 nm). Electrons may reach the liquid and generate hydrogen, for example. On the other hand, the same mechanism may also provide a pathway for oxidative aging of organics by holes even when the organic is dissolved in the liquid or adsorbed on the solid surface. The authors have started to study reactions of NO,. Methodology and instrumentation to measure reactions of relevant organic radicals with NO, and with its parent NO, were developed. Because of low extinction coefficients, conductivity will be the method of choice.'

Meisel, D. [Argonne National Lab., IL (US). Chemistry Div.; Camaioni, D.; Orlando, T. [Pacific Northwest National Lab., Richland, WA (US)

1997-01-01T23:59:59.000Z

240

Small, Inexpensive Combined NOx and O2 Sensor  

SciTech Connect (OSTI)

It has been successfully demonstrated in this program that a zirconia multilayer structure with rhodium-based porous electrodes performs well as an amperometric NO{sub x} sensor. The sensitivity of the sensor bodies operating at 650 to 700 C is large, with demonstrated current outputs of 14 mA at 500 ppm NO{sub x} from sensors with 30 layers. The sensor bodies are small (4.5 x 4.2 x 3.1 mm), rugged, and inexpensive. It is projected the sensor bodies will cost $5-$10 in production. This program has built on another successful development program for an oxygen sensor based on the same principles and sponsored by DOE. This oxygen sensor is not sensitive to NO{sub x}. A significant technical hurdle has been identified and solved. It was found that the 100% Rh electrodes oxidize rapidly at the preferred operating temperatures of 650-700 C, and this oxidation is accompanied by a volume change which delaminates the sensors. The problem was solved by using alloys of Rh and Pt. It was found that a 10%/90% Rh/Pt alloy dropped the oxidation rate of the electrodes by orders of magnitude without degrading the NO{sub x} sensitivity of the sensors, allowing long-term stable operation at the preferred operating temperatures. Degradation in the sensor output caused by temperature cycling was identified as a change in resistance at the junction between the sensor body and the external leads attached to the sensor body. The degradation was eliminated by providing strong mechanical anchors for the wire and processing the junctions to obtain good electrical bonds. The NO{sub x} sensors also detect oxygen and therefore the fully-packaged sensor needs to be enclosed with an oxygen sensor in a small, heated zirconia chamber exposed to test gas through a diffusion plug which limits the flow of gas from the outside. Oxygen is pumped from the interior of the chamber to lower the oxygen content and the combination of measurements from the NO{sub x} and oxygen sensors yields the NO{sub x} content of the gas. Two types of electronic control units were designed and built. One control unit provides independent constant voltages to the NOx and oxygen sensors and reads the current from them (that is, detects the amount of test gas present). The second controller holds the fully-assembled sensor at the desired operating temperature and controllably pumps excess oxygen from the test chamber. While the development of the sensor body was a complete success, the development of the packaging was only partially successful. All of the basic principles were demonstrated, but the packaging was too complex to optimize the operation within the resources of the program. Thus, no fully-assembled sensors were sent to outside labs for testing of cross-sensitivities, response times, etc. Near the end of the program, Sensata Technologies of Attleboro, MA tested the sensor bodies and confirmed the CeramPhysics measurements as indicated in the following attached letter. Sensata was in the process of designing their own packaging for the sensor and performing cross-sensitivity tests when they stopped all sensor development work due to the automotive industry downturn. Recently Ceramatec Inc. of Salt Lake City has expressed an interest in testing the sensor, and other licensing opportunities are being pursued.

W. Lawless; C. Clark

2008-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Atmospheric Environment 38 (2004) 27792787 First detection of nitrogen from NOx in tree rings: a 15  

E-Print Network [OSTI]

abies; Air pollution; Dendroecology; Nitrogen deposition; Stable isotopes; Nitrogen dioxide 1Atmospheric Environment 38 (2004) 2779­2787 First detection of nitrogen from NOx in tree rings 2004; accepted 27 February 2004 Abstract Nitrogen isotope analysis (d15 N) of tree rings is potentially

242

tive emissions from EVs (e.g., power plant NOx) and GPVs (tailpipe and  

E-Print Network [OSTI]

a few sluggish electric vehicles would cause enough traffic slowing that the gasoline- powered fleet Analy- sis article on battery-powered vehicles (Sept. 1996, p. 402A) serves as a useful remindertive emissions from EVs (e.g., power plant NOx) and GPVs (tailpipe and associated NO.,. emissions

Denver, University of

243

Interaction between soot particles and NOx during dielectric barrier discharge plasma remediation of simulated diesel exhaust  

E-Print Network [OSTI]

of simulated diesel exhaust Rajesh Doraia) University of Illinois, Department of Chemical Engineering, 1406 from combustion effluent and from diesel exhausts in particular. Soot particles are inevitably present, a computational investigation of the effect of soot on the plasma chemistry of NOx removal in a simulated diesel

Kushner, Mark

244

A Numerical Investigation into the Anomalous Slight NOx Increase when Burning Biodiesel: A New (Old) Theory  

SciTech Connect (OSTI)

Biodiesel is a notable alternative to petroleum derived diesel fuel because it comes from natural domestic sources and thus reduces dependence on diminishing petroleum fuel from foreign sources, it likely lowers lifecycle greenhouse gas emissions, and it lowers an engine's emission of most pollutants as compared to petroleum derived diesel. However, the use of biodiesel often slightly increases a diesel engine's emission of smog forming nitrogen oxides (NO{sub x}) relative to petroleum diesel. In this paper, previously proposed theories for this slight NOx increase are reviewed, including theories based on biodiesel's cetane number, which leads to differing amounts of charge preheating, and theories based on the fuel's bulk modulus, which affects injection timing. This paper proposes an additional theory for the slight NO{sub x} increase of biodiesel. Biodiesel typically contains more double bonded molecules than petroleum derived diesel. These double bonded molecules have a slightly higher adiabatic flame temperature, which leads to the increase in NOx production for biodiesel. Our theory was verified using numerical simulations to show a NOx increase, due to the double bonded molecules, that is consistent with observation. Further, the details of these numerical simulations show that NOx is predominantly due to the Zeldovich mechanism.

Ban-Weiss, G A; Chen, J Y; Buchholz, B A; Dibble, R W

2007-01-30T23:59:59.000Z

245

NOx-Mediated Homogeneous Pathways for the Synthesis of Formaldehyde from CH4-O2 Mixtures  

E-Print Network [OSTI]

CH4 conversion, because weaker C-H bonds in HCHO and CH3OH relative to CH4 lead to their fast that the O2 distribution along a reactor will not improve HCHO yields but may prove useful to inhibit NOx losses to less reactive N-compounds. 1. Introduction The practical conversion of remote natural gas

Iglesia, Enrique

246

The effect of reformate gas enrichment on extinction limits and NOX formation  

E-Print Network [OSTI]

premixed combustion. When the reformate gas is added, the formation of NO is reduced in a near advantage of the reformate gas enriched lean premixed combustion is that it greatly reduces the formation combustion; Fuel enrichment; NOX; Extinction limit; Reformate gas 1. Introduction Lean premixed combustion

Gülder, �mer L.

247

Procedure to Calculate NOx Reductions Using the Emissions & Generation Resource Integrated Database (E-Grid) Spreadsheet  

E-Print Network [OSTI]

energy savings in the American Electric Power West/PCA(Table 7). This was input in the last row of the American Electric Power West/PCA column in Table 9. Then, the NOx emissions reductions due to the energy savings by county were calculated as shown...

Haberl, J. S.; Im, P.; Culp, C.; Yazdani, B.; Fitzpatrick, T.; Verdict, M.; Turner, W. D.

2003-01-01T23:59:59.000Z

248

NOx reduction with the use of feedlot biomass as a reburn fuel  

E-Print Network [OSTI]

. Additional air called overfire air (about 20 % of total air) is injected in order to complete combustion. Typically reburn fuel is natural gas (NG). From previous research at TAMU, it was found that firing feedlot biomass (FB) as reburn fuel lowers the NOx...

Goughnour, Paul Gordon

2009-05-15T23:59:59.000Z

249

Latest developments and application of DB Riley's low NOx CCV{reg{underscore}sign} burner technology  

SciTech Connect (OSTI)

Recent developments in DB Riley (DBR) low NOx burner technology and the application of this technology in coal fired utility boilers are discussed. Since the promulgation of the Clean Air Act Amendment in 1990, DBR has sold nearly 1,500 Controlled Combustion Venturi (CCV{reg{underscore}sign}) burners on pulverized coal fired utility boilers reducing NOx emissions 50--70% from uncontrolled levels. This technology has been retrofitted on boiler designs ranging in size and type from 50 MW front wall fired boilers to 1,300 MW opposed fired cell type boilers. In DBR's latest version of the CCV{reg{underscore}sign} burner, a second controlled flow air zone was added to enhance NOx control capability. Other developments included improved burner air flow measurement accuracy and several mechanical design upgrades such as new coal spreader designs for 3 year wear life. Test results of the CCV{reg{underscore}sign} dual air zone burner in DBR's 100 million Btu/hr (29 MW) coal burner test facility are presented. In the test program, coals from four utility boiler sites were fired to provide a range of coal properties. A baseline high volatile bituminous coal was also fired to provide a comparison with 1992 test data for the CCV{reg{underscore}sign} single register burner. The tests results showed that the second air zone enhanced NOx reduction capability by an additional 20% over the single register design. Computational fluid dynamic (DFD) modeling results of the CCV{reg{underscore}sign} dual air zone burner are also presented showing near field mixing patterns conducive to low NOx firing. DBR was recently awarded Phase IV of the Low Emission Boiler System (LEBS) program by the US Department of Energy to build a proof of concept facility representing the next major advancement in pulverized coal burning technology. A key part of winning that award were test results of the CCV{reg{underscore}sign} dual air zone burner with advanced air staging and coal reburning in a 100 million Btu/hr (20 MW) U-fired slagging combustor test facility. These results showed NOx emissions of less than 0.2 lb/million Btu (0.086 g/MJ) while converting the coal ash into an inert, non-leachable solid. This results is an 80% reduction in NOx emissions from currently operating U-fired slagging boilers.

Penterson, C.; Ake, T.

1998-07-01T23:59:59.000Z

250

SOx-NOx-Rox Box{trademark} flue gas clean-up demonstration. Final report  

SciTech Connect (OSTI)

Babcock and Wilcox`s (B and W) SOx-NOx-Rox Box{trademark} process effectively removes SOx, NOx and particulate (Rox) from flue gas generated from coal-fired boilers in a single unit operation, a high temperature baghouse. The SNRB technology utilizes dry sorbent injection upstream of the baghouse for removal of SOx and ammonia injection upstream of a zeolitic selective catalytic reduction (SCR) catalyst incorporated in the baghouse to reduce NOx emissions. Because the SOx and NOx removal processes require operation at elevated gas temperatures (800--900 F) for high removal efficiency, high-temperature fabric filter bags are used in the baghouse. The SNRB technology evolved from the bench and laboratory pilot scale to be successfully demonstrated at the 5-MWe field scale. This report represents the completion of Milestone M14 as specified in the Work Plan. B and W tested the SNRB pollution control system at a 5-MWe demonstration facility at Ohio Edison`s R.E. Burger Plant located near Shadyside, Ohio. The design and operation were influenced by the results from laboratory pilot testing at B and W`s Alliance Research Center. The intent was to demonstrate the commercial feasibility of the SNRB process. The SNRB facility treated a 30,000 ACFM flue gas slipstream from Boiler No. 8. Operation of the facility began in May 1992 and was completed in May 1993. About 2,300 hours of high-temperature operation were achieved. The main emissions control performance goals of: greater than 70% SO{sub 2} removal using a calcium-based sorbent; greater than 90% NOx removal with minimal ammonia slip; and particulate emissions in compliance with the New Source Performance Standards (NSPS) of 0.03 lb/million Btu were exceeded simultaneously in the demonstration program when the facility was operated at optimal conditions. Testing also showed significant reductions in emissions of some hazardous air pollutants.

NONE

1995-09-01T23:59:59.000Z

251

ORIGINAL CONTRIBUTION Ozone and Short-term Mortality  

E-Print Network [OSTI]

. With the National Morbidity, Mortality, and Air Pollution Study (NMMAPS), we have developed na- tional approaches Ambient Air Qual- ity Standard (NAAQS) for ozone, adding a daily maximum 8-hour stan- dard of 80 ppb.19 Because of the relevance of epidemiologic evi- dence to the NAAQS for ozone and other pollutants

Dominici, Francesca

252

Atmospheric Environment 41 (2007) 31513160 Ozone removal by HVAC filters  

E-Print Network [OSTI]

Atmospheric Environment 41 (2007) 3151­3160 Ozone removal by HVAC filters P. Zhao, J.A. Siegel�, R May 2006; accepted 14 June 2006 Abstract Residential and commercial HVAC filters that have been loaded of the relative importance of HVAC filters as a removal mechanism for ozone in residential and commercial

Siegel, Jeffrey

253

Proceedings: Indoor Air 2005 OZONE REMOVAL BY RESIDENTIAL HVAC FILTERS  

E-Print Network [OSTI]

Proceedings: Indoor Air 2005 2366 OZONE REMOVAL BY RESIDENTIAL HVAC FILTERS P Zhao1,2 , JA Siegel1, Austin, Texas 78758, USA ABSTRACT HVAC filters have a significant influence on indoor air quality% for Filter #2 at a face velocity of 0.81 cm/s. The potential for HVAC filters to affect ozone concentrations

Siegel, Jeffrey

254

URBAN OZONE CONCENTRATION FORECASTING WITH ARTIFICIAL NEURAL NETWORK IN CORSICA  

E-Print Network [OSTI]

Perceptron; Ozone concentration. 1. Introduction Tropospheric ozone is a major air pollution problem, both, Ajaccio, France, e-mail: balu@univ-corse.fr Abstract: Atmospheric pollutants concentration forecasting is an important issue in air quality monitoring. Qualitair Corse, the organization responsible for monitoring air

Boyer, Edmond

255

METHANE de-NOX for Utility PC Boilers  

SciTech Connect (OSTI)

Preparations for conducting large-scale combustion tests with caking bituminous coal continued during the start of this quarter. Major project accomplishments related to bituminous coal testing included: a CFD preheat model and evaluation, an update of the process flow diagram and a detailed preheat burner mechanical design (suitable for construction) for firing bituminous coal. Installation and testing of the 85 MMBtu/h bituminous coal preheating system was planned to take place before the end of December. Based on the inability to conduct testing in Riley's Commercial Burner Test Facility (CBTF) during freezing weather, a schedule review indicated required site work for testing bituminous coal at the CBTF could not be completed before freezing weather set in at the site. Further bituminous preheat modification work was put on hold and efforts turned to securing the test facility over the winter season. Bituminous coal tests are therefore delayed; April-May 2005 is earliest estimate of when testing can resume. A request for a time extension was submitted to DOE to extend the project through September 2005 to allow time to secure additional funding and complete the bituminous coal testing. Removal of the PRB PC Preheater from the CBTF burner deck was completed. Decommissioning of the CBTF for the winter was also completed.

Bruce Bryan; Joseph Rabovitser; Serguei Nester; Stan Wohadlo

2004-12-31T23:59:59.000Z

256

Effects of 20002050 changes in climate and emissions on global tropospheric ozone and the policy-relevant background surface ozone  

E-Print Network [OSTI]

) project major changes in anthro- pogenic emissions of greenhouse gases and ozone precur- sors over the 2Effects of 2000­2050 changes in climate and emissions on global tropospheric ozone and the policy; published 27 September 2008. [1] We use a global chemical transport model (GEOS-Chem) driven by a general

Mickley, Loretta J.

257

Waste Coal Fines Reburn for NOx and Mercury Emission Reduction  

SciTech Connect (OSTI)

Injection of coal-water slurries (CWS) made with both waste coal and bituminous coal was tested for enhanced reduction of NO{sub x} and Hg emissions at the AES Beaver Valley plant near Monaca, PA. Under this project, Breen Energy Solutions (BES) conducted field experiments on the these emission reduction technologies by mixing coal fines and/or pulverized coal, urea and water to form slurry, then injecting the slurry in the upper furnace region of a coal-fired boiler. The main focus of this project was use of waste coal fines as the carbon source; however, testing was also conducted using pulverized coal in conjunction with or instead of waste coal fines for conversion efficiency and economic comparisons. The host site for this research and development project was Unit No.2 at AES Beaver Valley cogeneration station. Unit No.2 is a 35 MW Babcock & Wilcox (B&W) front-wall fired boiler that burns eastern bituminous coal. It has low NO{sub x} burners, overfire air ports and a urea-based selective non-catalytic reduction (SNCR) system for NO{sub x} control. The back-end clean-up system includes a rotating mechanical ash particulate removal and electrostatic precipitator (ESP) and wet flue gas desulfurization (FGD) scrubber. Coal slurry injection was expected to help reduce NOx emissions in two ways: (1) Via fuel-lean reburning when the slurry is injected above the combustion zone. (2) Via enhanced SNCR reduction when urea is incorporated into the slurry. The mercury control process under research uses carbon/water slurry injection to produce reactive carbon in-situ in the upper furnace, promoting the oxidation of elemental mercury in flue gas from coal-fired power boilers. By controlling the water content of the slurry below the stoichiometric requirement for complete gasification, water activated carbon (WAC) can be generated in-situ in the upper furnace. As little as 1-2% coal/water slurry (heat input basis) can be injected and generate sufficient WAC for mercury capture. During July, August, and September 2007, BES designed, procured, installed, and tested the slurry injection system at Beaver Valley. Slurry production was performed by Penn State University using equipment that was moved from campus to the Beaver Valley site. Waste coal fines were procured from Headwaters Inc. and transported to the site in Super Sacks. In addition, bituminous coal was pulverized at Penn State and trucked to the site in 55-gallon drums. This system was operated for three weeks during August and September 2007. NO{sub x} emission data were obtained using the plant CEM system. Hg measurements were taken using EPA Method 30B (Sorbent Trap method) both downstream of the electrostatic precipitator and in the stack. Ohio Lumex Company was on site to provide rapid Hg analysis on the sorbent traps during the tests. Key results from these tests are: (1) Coal Fines reburn alone reduced NO{sub x} emissions by 0-10% with up to 4% heat input from the CWS. However, the NO{sub x} reduction was accompanied by higher CO emissions. The higher CO limited our ability to try higher reburn rates for further NO{sub x} reduction. (2) Coal Fines reburn with Urea (Carbon enhanced SNCR) decreased NO{sub x} emissions by an additional 30% compared to Urea injection only. (3) Coal slurry injection did not change Hg capture across the ESP at full load with an inlet temperature of 400-430 F. The Hg capture in the ESP averaged 40%, with or without slurry injection; low mercury particulate capture is normally expected across a higher temperature ESP because any oxidized mercury is thought to desorb from the particulate at ESP temperatures above 250 F. (4) Coal slurry injection with halogen salts added to the mixing tank increased the Hg capture in the ESP to 60%. This significant incremental mercury reduction is important to improved mercury capture with hot-side ESP operation and wherever hindrance from sulfur oxides limit mercury reduction, because the higher temperature is above sulfur oxide dew point interference.

Stephen Johnson; Chetan Chothani; Bernard Breen

2008-04-30T23:59:59.000Z

258

Proceedings: Indoor Air 2005 REACTIONS BETWEEN OZONE AND BUILDING PRODUCTS: IMPACT ON  

E-Print Network [OSTI]

Proceedings: Indoor Air 2005 2118 REACTIONS BETWEEN OZONE AND BUILDING PRODUCTS: IMPACT ON PRIMARY of reactions of ozone on building products and on their emissions in indoor air. For this purpose, 12 building products were exposed to ozone in a dedicated experimental setup. The measured ozone removal rate

Paris-Sud XI, Université de

259

Ozone ensemble forecast with machine learning Vivien Mallet,1,2  

E-Print Network [OSTI]

Ozone ensemble forecast with machine learning algorithms Vivien Mallet,1,2 Gilles Stoltz,3 forecasts. The latter rely on a multimodel ensemble built for ozone forecasting with the modeling system Europe in order to forecast ozone daily peaks and ozone hourly concentrations. On the basis of past

Paris-Sud XI, Université de

260

An ozone climatology of the Dallas-Fort Worth area and its relationship to meteorology  

E-Print Network [OSTI]

, no extensive studies on ozone in this area have been published. This study presents a broad overview of the ozone problem in the DFW area. An ozone spatial and temporal climatology was constructed using ozone data at 23 different monitoring sites from 1980...

Nobis, Timothy Edward

1998-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

HYDROGEN GENERATION FROM PLASMATRON REFORMERS: A PROMISING TECHNOLOGY FOR NOX ADSORBER REGENERATION AND OTHER AUTOMOTIVE APPLICATIONS  

SciTech Connect (OSTI)

Plasmatron reformers are being developed at MIT and ArvinMeritor [1]. In these reformers a special low power electrical discharge is used to promote partial oxidation conversion of hydrocarbon fuels into hydrogen and CO. The partial oxidation reaction of this very fuel rich mixture is difficult to initiate. The plasmatron provides continuous enhanced volume initiation. To minimize electrode erosion and electrical power requirements, a low current, high voltage discharge with wide area electrodes is used. The reformers operate at or slightly above atmospheric pressure. Plasmatron reformers provide the advantages of rapid startup and transient response; efficient conversion of the fuel to hydrogen rich gas; compact size; relaxation or elimination of reformer catalyst requirements; and capability to process difficult to reform fuels, such as diesel and bio-oils. These advantages facilitate use of onboard hydrogen-generation technology for diesel exhaust after-treatment. Plasma-enhanced reformer technology can provide substantial conversion even without the use of a catalyst. Recent progress includes a substantial decrease in electrical power consumption (to about 200 W), increased flow rate (above 1 g/s of diesel fuel corresponding to approximately 40 kW of chemical energy), soot suppression and improvements in other operational features.. Plasmatron reformer technology has been evaluated for regeneration of NOx adsorber after-treatment systems. At ArvinMeritor tests were performed on a dual-leg NOx adsorber system using a Cummins 8.3L diesel engine both in a test cell and on a vehicle. A NOx adsorber system was tested using the plasmatron reformer as a regenerator and without the reformer i.e., with straight diesel fuel based regeneration as the baseline case. The plasmatron reformer was shown to improve NOx regeneration significantly compared to the baseline diesel case. The net result of these initial tests was a significant decrease in fuel penalty, roughly 50% at moderate adsorber temperatures. This fuel penalty improvement is accompanied by a dramatic drop in slipped hydrocarbon emissions, which decreased by 90% or more. Significant advantages are demonstrated across a wide range of engine conditions and temperatures. The study also indicated the potential to regenerate NOx adsorbers at low temperatures where diesel fuel based regeneration is not effective, such as those typical of idle conditions. Two vehicles, a bus and a light duty truck, have been equipped for plasmatron reformer NOx adsorber regeneration tests.

Bromberg, L.; Crane, S; Rabinovich, A.; Kong, Y; Cohn, D; Heywood, J; Alexeev, N.; Samokhin, A.

2003-08-24T23:59:59.000Z

262

How to Construct a Seasonal Index  

E-Print Network [OSTI]

For many crops, seasonality is often the dominant factor influencing prices within a single production period. This publication explains how to construct and use several kinds of seasonal indexes for crop marketing information....

Tierney Jr., William I.; Waller, Mark L.; Amosson, Stephen H.

1999-07-12T23:59:59.000Z

263

SDI Shifting Seasons Summit | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

SDI Shifting Seasons Summit SDI Shifting Seasons Summit October 15, 2014 12:00PM CDT to October 17, 2014 9:00PM CDT Keshena, WI http:sustainabledevelopmentinstitute.org201402...

264

Calculation of Integrated Nox Emissions Reductions from Energy Efficiency Renewable Energy (EE/RE) Programs across State Agencies in Texas  

E-Print Network [OSTI]

This paper presents an update of the integrated NOx emissions reductions calculations developed by the Energy Systems Laboratory (ESL) for the State of Texas to satisfy the reporting requirements for Senate Bill 5 of the Texas State Legislature...

Hberl, J.; Yazdani, B.; Baltazar, J. C.; Kim, H.; Mukhopadhyay, J.; Zilbershtein, G.; Ellis, S.; Parker, P.

2013-01-01T23:59:59.000Z

265

NOx Emissions Reduction from Continuous Commissioning(R) Measures for the Dallas-Fort Worth International Airport  

E-Print Network [OSTI]

Total NOx Reductions (lbs/day) Total NOx Reductions (Tons/day) TOT EQ ELECTRICITY (MWh) (Electricity and Chilled water) 4,761 7,278.7 3.6393 24.2 36.7 0.0184 HOT WATER (MCF) 8,358 1,170.2 0.5851 41.0 5.7 0.0029 Total 8,448.9 4.2244 42.5 0....0212 NOTES: 1) Assuming 7% for T&D losses and a Discount factor of 25%. Corresponding factors to integrated savings presented to the TCEQ. 2) A factor of 0.140 lb of NOx/MCF of Natural Gas (Controlled - Low NOx burners 140 A...

Yazdani, B.; Haberl, J. S.; Baltazar-Cervantes, J. C.

266

Chemical Consequences of Heme Distortion and the Role of Heme Distortion in Signal Transduction of H-NOX Proteins  

E-Print Network [OSTI]

of wild-type Tt H-NOX as well as energy minimizations 19with energy minimizations and visual inspection of the wild-high- energy frontier orbitals. 81 Heme distortion in wild-

Olea, Jr., Charles

2010-01-01T23:59:59.000Z

267

Heavy-duty diesel vehicle Nox? aftertreatment in 2010 : the infrastructure and compliance challenges of urea-SCR  

E-Print Network [OSTI]

Increasingly stringent heavy-duty vehicle emission regulations are prompting the use of PM and NOx aftertreatment systems in the US, the EU and Japan. In the US, the EPA Highway Diesel Rule, which will be fully implemented ...

Bodek, Kristian M

2008-01-01T23:59:59.000Z

268

An Analysis of the health impacts from PM and NOx emissions resulting from train operations in the Alameda Corridor, CA  

E-Print Network [OSTI]

2009). Estimating PM and NOx Train Emissions in the AlamedaAuthority. Number of Trains Running on the Alameda Corridor.x emissions resulting from train operations in the Alameda

Sangkapichai, Mana; Saphores, Jean-Daniel M; Ogunseitan, Oladele; Ritchie, Stephen G.; You, Soyoung Iris; Lee, Gunwoo

2010-01-01T23:59:59.000Z

269

Evaluation of microporous carbon filters as catalysts for ozone decomposition  

SciTech Connect (OSTI)

Ozone is produced in small quantities in photocopiers and laser printers in the workplace and large quantities in industrial waste water treatment facilities. Carbon filters are commonly used to decompose this unwanted ozone. The three most important factors in producing a filter for this purpose are flow properties, efficiency, and cost. Most ozone decomposition applications require very low back-pressure at modest flow rates. The tradeoff between the number of pores and the size of the pores will be discussed. Typical unfiltered emissions in the workplace are approximately 1 ppm. The maximum permissible exposure limit, PEL, for worker exposure to ozone is 0.1 ppm over 8 hours. Several methods have been examined to increase the efficiency of ozone decomposition. Carbon surfaces were modified with catalysts, the surface activated, and the surface area was increased, in attempts to decompose ozone more effectively. Methods to reduce both the processing and raw material costs were investigated. Several sources of microporous carbon were investigated as ozone decomposition catalysts. Cheaper processing routes including macropore templating, faster drying and extracting methods were also studied.

Whinnery, L.; Coutts, D.; Shen, C.; Adams, R. [Sandia National Labs., Livermore, CA (United States); Quintana, C.; Showalter, S. [Sandia National Labs., Albuquerque, NM (United States)

1994-12-31T23:59:59.000Z

270

NOx Emissions Reductions from Implementation of the 2000 IECC/IRC Conservation Code to Residential Construction in Texas  

E-Print Network [OSTI]

.1000 0.1500 0.2000 0.2500 0.3000 0.3500 0.4000 0.0000 0.0500 0.1000 0.1500 0.2000 0.2500 0.3000 0.3500 0.4000 To ns - NOx/day (average) Tons - NOX/day (p eak) Apx 2x difference 1:1 2...

Haberl, J. S.; Im, P.; Culp, C.; Yazdani, B.; Fitzpatrick, T.

2004-01-01T23:59:59.000Z

271

Closed loop engine control for regulating NOx emissions, using a two-dimensional fuel-air curve  

DOE Patents [OSTI]

An engine control strategy that ensures that NOx emissions from the engine will be maintained at an acceptable level. The control strategy is based on a two-dimensional fuel-air curve, in which air manifold pressure (AMP) is a function of fuel header pressure and engine speed. The control strategy provides for closed loop NOx adjustment to a base AMP value derived from the fuel-air curve.

Bourn, Gary D.; Smith, Jack A.; Gingrich, Jess W.

2007-01-30T23:59:59.000Z

272

Exposure-Relevant Ozone Chemistry in Occupied Spaces  

SciTech Connect (OSTI)

Ozone, an ambient pollutant, is transformed into other airborne pollutants in the indoor environment. In this dissertation, the type and amount of byproducts that result from ozone reactions with common indoor surfaces, surface residues, and vapors were determined, pollutant concentrations were related to occupant exposure, and frameworks were developed to predict byproduct concentrations under various indoor conditions. In Chapter 2, an analysis is presented of secondary organic aerosol formation from the reaction of ozone with gas-phase, terpene-containing consumer products in small chamber experiments under conditions relevant for residential and commercial buildings. The full particle size distribution was continuously monitored, and ultrafine and fine particle concentrations were in the range of 10 to>300 mu g m-3. Particle nucleation and growth dynamics were characterized.Chapter 3 presents an investigation of ozone reactions with aircraft cabin surfaces including carpet, seat fabric, plastics, and laundered and worn clothing fabric. Small chamber experiments were used to determine ozone deposition velocities, ozone reaction probabilities, byproduct emission rates, and byproduct yields for each surface category. The most commonly detected byproducts included C1?C10 saturated aldehydes and skin oil oxidation products. For all materials, emission rates were higher with ozone than without. Experimental results were used to predict byproduct exposure in the cabin and compare to other environments. Byproduct levels are predicted to be similar to ozone levels in the cabin, which have been found to be tens to low hundreds of ppb in the absence of an ozone converter. In Chapter 4, a model is presented that predicts ozone uptake by and byproduct emission from residual chemicals on surfaces. The effects of input parameters (residue surface concentration, ozone concentration, reactivity of the residue and the surface, near-surface airflow conditions, and byproduct yield) were explored. In Chapter 5, the reaction of ozone with permethrin, a residual insecticide used in aircraft cabins, to form phosgene is investigated. A derivatization technique was developed to detect phosgene at low levels, and chamber experiments were conducted with permethrin-coated cabin materials. It was determined that phosgene formation, if it occurs in the aircraft cabin, is not likely to exceed the relevant, health-based phosgene exposure guidelines.

Coleman, Beverly Kaye

2009-04-01T23:59:59.000Z

273

Ozone generation by rock fracture: Earthquake early warning?  

SciTech Connect (OSTI)

We report the production of up to 10 ppm ozone during crushing and grinding of typical terrestrial crust rocks in air, O{sub 2} and CO{sub 2} at atmospheric pressure, but not in helium or nitrogen. Ozone is formed by exoelectrons emitted by high electric fields, resulting from charge separation during fracture. The results suggest that ground level ozone produced by rock fracture, besides its potential health hazard, can be used for early warning in earthquakes and other catastrophes, such as landslides or land shifts in excavation tunnels and underground mines.

Baragiola, Raul A.; Dukes, Catherine A.; Hedges, Dawn [Engineering Physics, University of Virginia, Charlottesville, Virginia 22904 (United States)

2011-11-14T23:59:59.000Z

274

NOx reduction in combustion with concentrated coal streams and oxygen injection  

DOE Patents [OSTI]

NOx formation in the combustion of solid hydrocarbonaceous fuel such as coal is reduced by obtaining, from the incoming feed stream of fuel solids and air, a stream having a ratio of fuel solids to air that is higher than that of the feed steam, and injecting the thus obtained stream and a small amount of oxygen to a burner where the fuel solids are combusted.

Kobayashi, Hisashi; Bool III, Lawrence E.; Snyder, William J.

2004-03-02T23:59:59.000Z

275

Development of METHANE de-NOX Reburn Process for Wood Waste and Biomass Fired Stoker Boilers - Final Report - METHANE de-NOX Reburn Technology Manual  

SciTech Connect (OSTI)

The overall objective of this project was to demonstrate the effectiveness of the METHANE de-NOX® (MdN) Reburn process in the Forest Products Industry (FPI) to provide more efficient use of wood and sludge waste (biosolids) combustion for both energy generation and emissions reduction (specifically from nitrogen oxides (NOx)) and to promote the transfer of the technology to the wide range of wood waste-fired stoker boilers populating the FPI. This document, MdN Reburn Commercial Technology Manual, was prepared to be a resource to promote technology transfer and commercialization activities of MdN in the industry and to assist potential users understand its application and installation requirements. The Manual includes a compilation of MdN commercial design data from four different stoker boiler designs that were baseline tested as part of the development effort. Design information in the Manual include boiler CFD model studies, process design protocols, engineering data sheets and commercial installation drawings. Each design package is unique and implemented in a manner to meet specific mill requirements.

J. Rabovitser; B. Bryan; S. Wohadlo; S. Nester; J. Vaught; M. Tartan (Gas Technology Institute); R. Glickert (ESA Environmental Solutions)

2007-12-31T23:59:59.000Z

276

Modeling Species Inhibition of NO oxidation in Urea-SCR Catalysts for Diesel Engine NOx Control  

SciTech Connect (OSTI)

Urea-selective catalytic reduction (SCR) catalysts are regarded as the leading NOx aftertreatment technology to meet the 2010 NOx emission standards for on-highway vehicles running on heavy-duty diesel engines. However, issues such as low NOx conversion at low temperature conditions still exist due to various factors, including incomplete urea thermolysis, inhibition of SCR reactions by hydrocarbons and H2O. We have observed a noticeable reduction in the standard SCR reaction efficiency at low temperature with increasing water content. We observed a similar effect when hydrocarbons are present in the stream. This effect is absent under fast SCR conditions where NO ~ NO2 in the feed gas. As a first step in understanding the effects of such inhibition on SCR reaction steps, kinetic models that predict the inhibition behavior of H2O and hydrocarbons on NO oxidation are presented in the paper. A one-dimensional SCR model was developed based on conservation of species equations and was coded as a C-language S-function and implemented in Matlab/Simulink environment. NO oxidation and NO2 dissociation kinetics were defined as a function of the respective adsorbate’s storage in the SCR catalyst. The corresponding kinetic models were then validated on temperature ramp tests that showed good match with the test data.

Devarakonda, Maruthi N.; Tonkyn, Russell G.; Tran, Diana N.; Lee, Jong H.; Herling, Darrell R.

2010-09-15T23:59:59.000Z

277

Modeling Species Inhibition of NO Oxidation in Urea-SCR Catalysts for Diesel Engine NOx Control  

SciTech Connect (OSTI)

Urea-selective catalytic reduction (SCR) catalysts are regarded as the leading NOx aftertreatment technology to meet the 2010 NOx emission standards for on-highway vehicles running on heavy-duty diesel engines. However, issues such as low NOx conversion at low temperature conditions still exist due to various factors, including incomplete urea thermolysis, inhibition of SCR reactions by hydrocarbons and H2O. We have observed a noticeable reduction in the standard SCR reaction efficiency at low temperature with increasing water content. We observed a similar effect when hydrocarbons are present in the stream. This effect is absent under fast SCR conditions where NO ~ NO2 in the feed gas. As a first step in understanding the effects of such inhibition on SCR reaction steps, kinetic models that predict the inhibition behavior of H2O and hydrocarbons on NO oxidation are presented in the paper. A one-dimensional SCR model was developed based on conservation of species equations and was coded as a C-language S-function and implemented in Matlab/Simulink environment. NO oxidation and NO2 dissociation kinetics were defined as a function of the respective adsorbate’s storage in the Fe-zeolite SCR catalyst. The corresponding kinetic models were then validated on temperature ramp tests that showed good match with the test data. Such inhibition models will improve the accuracy of model based control design for integrated DPF-SCR aftertreatment systems.

Devarakonda, Maruthi N.; Tonkyn, Russell G.; Tran, Diana N.; Lee, Jong H.; Herling, Darrell R.

2011-04-20T23:59:59.000Z

278

Ammonia Generation over TWC for Passive SCR NOX Control for Lean Gasoline Engines  

SciTech Connect (OSTI)

A commercial three-way catalyst (TWC) was evaluated for ammonia (NH3) generation on a 2.0-liter BMW lean burn gasoline direct injection engine as a component in a passive ammonia selective catalytic reduction (SCR) system. The passive NH3 SCR system is a potential low cost approach for controlling nitrogen oxides (NOX) emissions from lean burn gasoline engines. In this system, NH3 is generated over a close-coupled TWC during periodic slightly rich engine operation and subsequently stored on an underfloor SCR catalyst. Upon switching to lean, NOX passes through the TWC and is reduced by the stored NH3 on the SCR catalyst. NH3 generation was evaluated at different air-fuel equivalence ratios at multiple engine speed and load conditions. Near complete conversion of NOX to NH3 was achieved at =0.96 for nearly all conditions studied. At the =0.96 condition, HC emissions were relatively minimal, but CO emissions were significant. Operation at AFRs richer than =0.96 did not provide more NH3 yield and led to higher HC and CO emissions. Results of the reductant conversion and consumption processes were used to calculate a representative fuel consumption of the engine operating with an ideal passive SCR system. The results show a 1-7% fuel economy benefit at various steady-state engine speed and load points relative to a stoichiometric engine operation.

Prikhodko, Vitaly Y [ORNL] [ORNL; Parks, II, James E [ORNL; Pihl, Josh A [ORNL] [ORNL; Toops, Todd J [ORNL] [ORNL

2014-01-01T23:59:59.000Z

279

Evaluation of Gas Reburning & Low NOx Burners on a Wall Fired Boiler Performance and Economics Report Gas Reburning-Low NOx Burner System Cherokee Station Unit 3 Public Service Company of Colorado  

SciTech Connect (OSTI)

Under the U.S. Department of Energy's Clean Coal Technology Program (Round 3), a project was completed to demonstrate control of boiler NOX emissions and to a lesser degree, due to coal replacement, SO2 emissions. The project involved combining Gas Reburning with Low NOX Burners (GR-LNB) on a coal-fired electric utility boiler to determine if high levels of NOX reduction (70%) could be achieved. Sponsors of the project included the U.S. Department of Energy, the Gas Research Institute, Public Service Company of Colorado, Colorado Interstate Gas, Electric Power Research Institute, and the Energy and Environmental Research Corporation. The GR-LNB demonstration was performed on Public Service Company of Colorado's (PSCO) Cherokee Unit #3, located in Denver, Colorado. This unit is a 172 MW~ wall-fired boiler that uses Colorado Bituminous, low-sulfur coal. It had a baseline NOX emission level of 0.73 lb/106 Btu using conventional burners. Low NOX burners are designed to yield lower NOX emissions than conventional burners. However, the NOX control achieved with this technique is limited to 30-50%. Also, with LNBs, CO emissions can increase to above acceptable standards. Gas Reburning (GR) is designed to reduce NOX in the flue gas by staged fuel combustion. This technology involves the introduction of natural gas into the hot furnace flue gas stream. When combined, GR and LNBs minimize NOX emissions and maintain acceptable levels of CO emissions. A comprehensive test program was completed, operating over a wide range of boiler conditions. Over 4,000 hours of operation were achieved, providing substantial data. Measurements were taken to quantify reductions in NOX emissions, the impact on boiler equipment and operability and factors influencing costs. The GR-LNB technology achieved good NOX emission reductions and the goals of the project were achieved. Although the performance of the low NOX burners (supplied by others) was less than expected, a NOX reduction of 65% was achieved at an average gas heat input of 18Y0. The performance goal of 70% reduction was met on many test runs, but at a higher reburn gas heat input. S02 emissions, based on coal replacement, were reduced by 18Y0. The performance goal of 70% reduction was met on many test runs, but at a higher reburn gas heat input. S02 emissions, based on coal replacement, were reduced by 18Y0. Toward the end of the program, a Second Generation gas injection system was installed. Higher injector gas pressures were used that eliminated the need for flue gas recirculation as used in the first generation design. The Second Generation GR resulted in similar NOX reduction performance as that for the First Generation. With an improvement in the LNB performance in combination with the new gas injection system , the reburn gas could be reduced to 12.5% of the total boiler heat input to achieve al 64?40 reduction in NO, emissions. In addition, the OFA injectors were modified to provide for better mixing to lower CO emissions.

None

1998-07-01T23:59:59.000Z

280

Ozone concentrations in El Paso, Texas  

SciTech Connect (OSTI)

El Paso, Texas may have a problem in meeting ambient air standards due to influx of pollutants from foreign sources. Cd. Juarez, Chihuahua, and Fort Bliss abut the city and are areas over which the Texas Air Control Board (TACB) has little or no jurisdiction. The Board maintains two Continuous Air Monitoring Stations (CAM) in El Paso. Ozone, nitric oxide, and nitrogen dioxide data were obtained from these stations. If the EPA Empirical Kinetic Model is used for El Paso, reducing NMHC concentrations may increase rather than decrease O/sub 3/ concentrations. The Texas State Implementation Plan, while not based on Empirical Kinetic Modeling, calls for a reduction of 18% in NMHC. However, 31% of all NMHC in El Paso arise from sources over which Texas had little (a federal military reservation) or no (Cd. Juarez) jurisdiction. It appears the TACB is correct in believing the SIP for O/sub 3/ may not bring El Paso into compliance. (JMT)

Crocker, J.E. (Texas Air Control Board, Austin); Applegate, H.G.

1983-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Attosecond electronic and nuclear quantum photodynamics of the ozone molecule  

SciTech Connect (OSTI)

Coupled electron-nuclear dynamics simulations are investigated for the ozone molecule on the attosecond time scale. The initial wavepacket is pumped as a coherent superposition of two or three electronic states.

Halász, G. J. [Department of Information Technology, University of Debrecen, H-4010 Debrecen, PO Box 12 (Hungary)] [Department of Information Technology, University of Debrecen, H-4010 Debrecen, PO Box 12 (Hungary); Perveaux, A.; Lasorne, B.; Gatti, F. [CTMM, Institut Charles Gerhardt Montpellier, F-34095 Montpellier Cedex 5 (France)] [CTMM, Institut Charles Gerhardt Montpellier, F-34095 Montpellier Cedex 5 (France); Robb, M. A. [Imperial College London, Department of Chemistry, London SW7 2AZ (United Kingdom)] [Imperial College London, Department of Chemistry, London SW7 2AZ (United Kingdom); Vibók, Á. [Department of Theoretical Physics, University of Debrecen, H-40410 Debrecen, PO Box 5 (Hungary)] [Department of Theoretical Physics, University of Debrecen, H-40410 Debrecen, PO Box 5 (Hungary)

2013-11-13T23:59:59.000Z

282

Global Health and Economic Impacts of Future Ozone Pollution  

E-Print Network [OSTI]

We assess the human health and economic impacts of projected 2000-2050 changes in ozone pollution using the MIT Emissions Prediction and Policy Analysis-Health Effects (EPPA-HE) model, in combination with results from the ...

Webster, Mort D.

283

Strategies for Aligning Program Demand with Contractor's Seasonal...  

Energy Savers [EERE]

Aligning Program Demand with Contractor's Seasonal Fluctuations Strategies for Aligning Program Demand with Contractor's Seasonal Fluctuations Better Buildings Neighborhood Program...

284

The role of ozone in tracheal cell transformation  

SciTech Connect (OSTI)

This project examined the potential role of ozone as a respiratory carcinogen by characterizing its ability to induce or modulate the preneoplastic transformation of rat tracheal epithelial cells. The chemical reactivity of ozone and the types of damage it can cause suggest that it may have a role in environmental carcinogenesis. Few other studies have examined the direct cytotoxic or transforming effects of ozone after in vivo or in vitro exposure of cells, and no studies have been reported on the comparative effects of ozone on respiratory cells exposed in vivo or in vitro. The induction of early preneoplastic changes in populations of rat tracheal epithelial cells by carcinogens can be detected and quantified in vitro after exposures in vivo or in vitro of tracheal epithelial cells. This cell culture and transformation system was used to characterize the transforming potency of ozone. Tracheal epithelial cells were isolated from Fischer-344/N rats that had been exposed for six hours per day, five days per week for one, two, or four weeks to 0, 0.12, 0.5, or 1.0 parts per million (ppm)* ozone (sea-level equivalents). Cell populations were examined in culture for increases in the frequency of preneoplastic variants. Rats exposed to ozone did not exhibit an increase in the frequency of preneoplastic tracheal cells, although exposed tracheas did exhibit dose-dependent morphological changes. Rat tracheal epithelial cells were given single, 40-minute in vitro exposures to concentrations of ozone that did not result in any detectable decrease in colony-forming efficiency.

Thomassen, D.G.; Harkema, J.R.; Sun, J.D.; Stephens, N.D.; Griffith, W.C. (Inhalation Toxicology Research Institute, Lovelace Biomedical and Environmental Research Institute, Albuquerque, NM (United States))

1992-04-01T23:59:59.000Z

285

Understanding how the North American Monsoon creates an ozone  

E-Print Network [OSTI]

EPA NEI-05 + Mexico NEI · Biogenic emissions: MEGAN ­ online calculation based on T, PAR · Wildfire enhancement over southern US due to convective transport of O3 and its precursors coincident with lightning-produced NOx ­ The location of maximum O3 values is anywhere from northern Mexico to Florida #12;Previous work

286

NOx Emissions Reduction from CPS Energy's "Save For Tomorrow Energy Plan" Within the Alamo Area Council of Governments Report to the Texas Commission on Environmental Quality  

E-Print Network [OSTI]

ESL-TR-10-10-01 NOx EMISSIONS REDUCTION FROM CPS ENERGY?S ?SAVE FOR TOMORROW ENERGY PLAN? WITHIN THE ALAMO AREA COUNCIL OF GOVERNMENTS REPORT TO THE TEXAS COMMISSION ON ENVIRONMENTAL QUALITY (TCEQ) Sung Lok Do Juan.../yr and annual NOx emissions reductions of non-residential sector were 32.01 Ton/yr. The NOx emissions reductions estimated through 2020 energy savings potential were 3,344 ton/year. Annual NOx emissions reductions of residential sector were 1,873 ton...

Do, S. L.; Baltazar, J. C.; Haberl, J.; Yazdani, B.

287

Development of Optimal Catalyst Designs and Operating Strategies for Lean NOx Reduction in Coupled LNT-SCR Systems  

SciTech Connect (OSTI)

Oxides of nitrogen in the form of nitric oxide (NO) and nitrogen dioxide (NO{sub 2}) commonly referred to as NO{sub x}, is one of the two chemical precursors that lead to ground-level ozone, a ubiquitous air pollutant in urban areas. A major source of NO{sub x} is generated by equipment and vehicles powered by diesel engines, which have a combustion exhaust that contains NO{sub x} in the presence of excess O{sub 2}. Catalytic abatement measures that are effective for gasoline-fueled engines such as the precious metal containing three-way catalytic converter (TWC) cannot be used to treat O2-laden exhaust containing NO{sub x}. Two catalytic technologies that have emerged as effective for NO{sub x} abatement are NO{sub x} storage and reduction (NSR) and selective catalytic reduction (SCR). NSR is similar to TWC but requires much larger quantities of expensive precious metals and sophisticated periodic switching operation, while SCR requires an on-board source of ammonia which serves as the chemical reductant of the NO{sub x}. The fact that NSR produces ammonia as a byproduct while SCR requires ammonia to work has led to interest in combining the two together to avoid the need for the cumbersome ammonia generation system. In this project a comprehensive study was carried out of the fundamental aspects and application feasibility of combined NSR/SCR. The project team, which included university, industry, and national lab researchers, investigated the kinetics and mechanistic features of the underlying chemistry in the lean NOx trap (LNT) wherein NSR was carried out, with particular focus on identifying the operating conditions such as temperature and catalytic properties which lead to the production of ammonia in the LNT. The performance features of SCR on both model and commercial catalysts focused on the synergy between the LNT and SCR converters in terms of utilizing the upstream-generated ammonia and alternative reductants such as propylene, representing the hydrocarbon component of diesel exhaust. First-principle models of the LNT and SCR converters, which utilized the mechanistic-based kinetics and realistic treatments of the flow and transport processes, in combination with bench-scale reactor experiments helped to identify the best designs for combining the NSR and SCR catalysts over a range of operating conditions encountered in practice. This included catalysts having multiple zones and layers and additives with the focus on determining the minimal precious metal component needed to meet emission abatement targets over a wide range of operating conditions. The findings from this study provide diesel vehicle and catalyst companies valuable information to develop more cost effective diesel emissions catalysts which helps to expand the use of more fuel efficient diesel power. The fundamental modeling and experimental tools and findings from this project can be applied to catalyst technologies used in the energy and chemical industries. Finally, the project also led to training of several doctoral students who were placed in research jobs in industry and academia.

Harold, Michael; Crocker, Mark; Balakotaiah, Vemuri; Luss, Dan; Choi, Jae-Soon; Dearth, Mark; McCabe, Bob; Theis, Joe

2013-09-30T23:59:59.000Z

288

Proceedings of Healthy Buildings 2009 Paper 141 Removal of Indoor Ozone with Reactive Materials: Preliminary Results and  

E-Print Network [OSTI]

Proceedings of Healthy Buildings 2009 Paper 141 Removal of Indoor Ozone with Reactive Materials air quality. #12;Proceedings of Healthy Buildings 2009 Paper 141 Removing ozone from indoor

Siegel, Jeffrey

289

Seasonal demand and supply analysis of turkeys  

E-Print Network [OSTI]

SEASONAL DEMAND AND SUPPLY ANALYSIS OF TURKEYS A Thesis by VITO JAMES BLOMO Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1972 Ma)or Sub...)ect: Agricultural Economics SEASONAL DEMAND AND SUPPLY ANALYSIS OF TURKEYS A Thesis by VITO JAMES BLOMO Approved as to style and content by: (Chairman of C mmittee) (Head of Department) (Member) (Member) ( ber) (Memb er) May 1972 ABSTRACT Seasonal...

Blomo, Vito James

1972-01-01T23:59:59.000Z

290

Near-Zero NOx Combustion Technology for ATS Mercury 50 Gas Turbine  

SciTech Connect (OSTI)

A project to demonstrate a near-zero NOx, catalytic combustion technology for natural gas-fired, industrial gas turbines is described. In a cooperative effort between Solar Turbines Incorporated and Precision Combustion Incorporated (PCI), proof-of-concept rig testing of PCI's fuel-rich catalytic combustion technology has been completed successfully. The primary technical goal of the project was to demonstrate NOx and CO emissions below 5ppm and 10 ppm, respectively, (corrected to 15% O{sub 2}) at realistic gas turbine operating conditions. The program consisted of two tasks. In the first task, a single prototype RCL{trademark} (Rich Catalytic Lean Burn) module was demonstrated at Taurus 70 (7.5 Mw) operating conditions (1.6 MPa, 16 atm) in a test rig. For a Taurus 70 engine, eight to twelve RCL modules will be required, depending on the final system design. In the second task, four modules of a similar design were adapted to a Saturn engine (1 Mw) test rig (600 kPa, 6 atm) to demonstrate gas turbine light-off and operation with an RCL combustion system. This project was initially focused on combustion technology for the Mercury 50 engine. However, early in the program, the Taurus 70 replaced the Mercury. This substitution was motivated by the larger commercial market for an ultra-low NOx Taurus 70 in the near-term. Rig tests using a single prototype RCL module at Taurus 70 conditions achieved NOx emissions as low as 0.75 ppm. A combustor turndown of approximately 110C (200F) was achieved with NOx and CO emissions below 3 ppm and 10 ppm, respectively. Catalyst light-off occurred at an inlet temperature of 310C (590F). Once lit the module remained active at inlet air temperatures as low as 204C (400F). Combustor pressure oscillations were acceptably low during module testing. Single module rig tests were also conducted with the Taurus 70 module reconfigured with a central pilot fuel injector. Such a pilot will be required in a commercial RCL system for turbine light-off and transient operation. At and near simulated full load engine conditions, the pilot operated at low pilot fueling rates without degrading overall system emissions. In the second project task, a set of four Taurus 70 modules was tested in an existing Saturn engine rig. The combustion system allowed smooth engine startup and load variation. At steady state conditions (between 82% and 89.7% engine speed; 32% and 61% load), NOx and CO emissions were below 3ppm and 10ppm, respectively. Rig limitations unrelated to the RCL technology prevented low emissions operation outside of this speed range. Combustor pressure oscillations were low, below 0.25 % (peak-to-peak) of the mean combustor pressure.

Kenneth Smith

2004-12-31T23:59:59.000Z

291

Seasonality and Its Effects on Crop Markets  

E-Print Network [OSTI]

consistent than the highs) and then rely on magnitude to predict the high. For example, a particular crop?s seasonal low may have occurred in October-November 80 percent of the time. The seasonal high was 12 to 15 percent above the seasonal low 75 percent... of the time. Based on this analysis, one would expect the seasonal low to come at harvest (in October or November) and the high to be 12 to 15 percent above the low. Of the two, timing is the more important for speculative purposes, whereas magnitude is often...

Tierney Jr., William I.; Waller, Mark L.; Amosson, Stephen H.

1999-07-12T23:59:59.000Z

292

UTILIZING WATER EMULSIFICATION TO REDUCE NOX AND PARTICULATE EMISSIONS ASSOCIATED WITH BIODIESEL  

SciTech Connect (OSTI)

A key barrier limiting extended utilization of biodiesel is higher NOx emissions compared to petrodiesel fuels. The reason for this effect is unclear, but various researchers have attributed this phenomena to the higher liquid bulk modulus associated with biodiesel and the additional heat released during the breaking of C-C double bonds in the methyl ester groups. In this study water was incorporated into neat biodiesel (B100) as an emulsion in an attempt to lower NOx and particulate matter (PM) emissions. A biodiesel emulsion containing 10wt% water was formulated and evaluated against an ultra-low sulfur petroleum diesel (ULSD) and neat biodiesel (B100) in a light-duty diesel engine operated at 1500RPM and at loads of 68Nm (50ft-lbs) and 102Nm (75ft-lbs). The influence of exhaust gas recirculation (EGR) was also examined. The incorporation of water was found to significantly lower the NOx emissions of B100, while maintaining fuel efficiency when operating at 0 and 27% EGR. The soot fraction of the particulates (as determined using an opacity meter) was much lower for the B100 and B100-water emulsion compared ULSD. In contrast, total PM mass (for the three fuel types) was unchanged for the 0% EGR condition but was significantly lower for the B100 and B100-emulsion during the 27% EGR condition compared to the ULSD fuel. Analysis of the emissions and heat release data indicate that water enhances air-fuel premixing to maintain fuel economy and lower soot formation. The exhaust chemistry of the biodiesel base fuels (B100 and water-emulsified B100) was found to be unique in that they contained measurable levels of methyl alkenoates, which were not found for the ULSD. These compounds were formed by the partial cracking of the methyl ester groups during combustion.

Kass, Michael D [ORNL; Lewis Sr, Samuel Arthur [ORNL; Lee, Doh-Won [ORNL; Huff, Shean P [ORNL; Storey, John Morse [ORNL; Swartz, Matthew M [ORNL; Wagner, Robert M [ORNL

2009-01-01T23:59:59.000Z

293

Transient Dynamometer Testing of a Single Leg NOx Adsorber Combined with a  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 thFuel Processor for Enhanced NOx Control |

294

Transient Dynamometer Testing of a Single-Leg NOX Adsorber Combined with a  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage »of EnergyThe EnergyDepartment7 thFuel Processor for Enhanced NOx Control

295

Status of APBF-DEC NOx Adsorber/DPF Projects | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage » SearchEnergyDepartmentScopingOverviewFranklin M.EngineReport onAPBF-DEC NOx

296

APBF-DEC NOx Adsorber/DPF Project: SUV/Pick-Up Platform | Department of  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartment of Energy 601 High IntegrityEnergy NOx Adsorber/DPF Project:

297

Reduction of NOx in Synthetic Diesel Exhaust via Two-Step Plasma-Catalysis  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared at 278, 298,NIST 800-53 NationalTreatment. | EMSL NOx in

298

Heavy-Duty NOx Emissions Control: Reformer-Assisted vs. Plasma-Facilitated  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-UpHeatMulti-Dimensional Subject:Ground Hawaii CleanHeat PumpDuty HCCIModelingLean NOx

299

NOx Measurement Errors in Ammonia-Containing Exhaust | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d F S i DOEToward aInnovation |NEXTDevelopment NOxAftertreatment

300

Comparison of three vertically resolved ozone data sets: climatology, trends and radiative forcings  

E-Print Network [OSTI]

Climate models that do not simulate changes in stratospheric ozone concentrations require the prescription of ozone fields to accurately calculate UV fluxes and stratospheric heating rates. In this study, three different ...

Hassler, B.

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Atmospheric Environment 38 (2004) 14251436 A development of ozone abatement strategies for the Grenoble  

E-Print Network [OSTI]

Atmospheric Environment 38 (2004) 1425­1436 A development of ozone abatement strategies are generated in the Grenoble plume. For developing ozone abatement strategies it is important to know whether

302

A delayed effect of ozone fumigation on photosynthesis of Norway spruce  

E-Print Network [OSTI]

A delayed effect of ozone fumigation on photosynthesis of Norway spruce D. Eamus1 A.W. Davis J into the long-lastincl effects of ozone fumiga- tion upon photosynthesis of Norway spruce. Measurements were

Paris-Sud XI, Université de

303

E-Print Network 3.0 - acute ozone-induced change Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Abstract Predicting ozone-induced reduction of carbon... a leaf-level model to the whole tree, it is possible to investigate whether the ozone-induced ... Source: Michigan...

304

Examination of the Effects of Sea Salt Aerosols on Southeast Texas Ozone and Secondary Organic Aerosol  

E-Print Network [OSTI]

such as ozone, reactive nitrogen, mercury, and sulfur containing compounds. Urban areas are most impacted by these trace gases, which is a concern because ozone especially affects the health of citizens. Experiments have three basic parts. First we generate mono...

Benoit, Mark David

2013-02-06T23:59:59.000Z

305

Pilot Scale Study of Excess Sludge Production Reduction in Wastewater Treatment by Ozone  

E-Print Network [OSTI]

Pilot Scale Study of Excess Sludge Production Reduction in Wastewater Treatment by Ozone Yuan Ma-scale reactors were operated at the LaPrairie Wastewater Treatment plant (one control and one ozonated

Barthelat, Francois

306

E-Print Network 3.0 - acid regulates ozone-induced Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ozone-induced Search Powered by Explorit Topic List Advanced Search Sample search results for: acid regulates ozone-induced Page: << < 1 2 3 4 5 > >> 1 Plant Molecular Biology 51:...

307

Meteorological Simulations of Ozone Episode Case Days during the 1996 Paso del Norte Ozone Study  

SciTech Connect (OSTI)

Meteorological simulations centered around the border cities of El Paso and Ciudad Juarez have been performed during an ozone episode that occurred on Aug. 13,1996 during the 1996 Paso del Norte Ozone Study field campaign. Simulations were petiormed using the HOTMAC mesoscale meteorological model using a 1,2,4, and 8 km horizontal grid size nested mesh system. Investigation of the vertical structure and evolution of the atmospheric boundary layer for the Aug. 11-13 time period is emphasized in this paper. Comparison of model-produced wind speed profiles to rawirisonde and radar profiler measurements shows reasonable agreement. A persistent upper-level jet was captured in the model simulations through data assimilation. In the evening hours, the model was not able to produce the strong wind direction shear seen in the radar wind profiles. Based on virtual potential temperature profile comparisons, the model appears to correctly simulate the daytime growth of the convective mixed layer. However, the model underestimates the cooling of the surface layer at night. We found that the upper-level jet significantly impacted the turbulence structure of the boundary layer, leading to relatively high turbulent kinetic energy (tke) values aloft at night. The model indicates that these high tke values aloft enhance the mid-morning growth of the boundary layer. No upper-level turbulence measurements were available to verify this finding, however. Radar profiler-derived mixing heights do indicate relatively rapid morning growth of the mixed layer.

Brown, M.J.; Costigan, K.; Muller, C.; Wang, G.

1999-02-01T23:59:59.000Z

308

1 Ozone pollution forecasting 3 Herve Cardot, Christophe Crambes and Pascal Sarda.  

E-Print Network [OSTI]

Contents 1 Ozone pollution forecasting 3 Herv´e Cardot, Christophe Crambes and Pascal Sarda. 1;1 Ozone pollution forecasting using conditional mean and conditional quantiles with functional covariates Herv´e Cardot, Christophe Crambes and Pascal Sarda. 1.1 Introduction Prediction of Ozone pollution

Crambes, Christophe

309

Method for control of NOx emission from combustors using fuel dilution  

DOE Patents [OSTI]

A method of controlling NOx emission from combustors. The method involves the controlled addition of a diluent such as nitrogen or water vapor, to a base fuel to reduce the flame temperature, thereby reducing NOx production. At the same time, a gas capable of enhancing flame stability and improving low temperature combustion characteristics, such as hydrogen, is added to the fuel mixture. The base fuel can be natural gas for use in industrial and power generation gas turbines and other burners. However, the method described herein is equally applicable to other common fuels such as coal gas, biomass-derived fuels and other common hydrocarbon fuels. The unique combustion characteristics associated with the use of hydrogen, particularly faster flame speed, higher reaction rates, and increased resistance to fluid-mechanical strain, alter the burner combustion characteristics sufficiently to allow operation at the desired lower temperature conditions resulting from diluent addition, without the onset of unstable combustion that can arise at lower combustor operating temperatures.

Schefer, Robert W. (Alamo, CA); Keller, Jay O (Oakland, CA)

2007-01-16T23:59:59.000Z

310

Agricultural Bio-Fueled Generation of Electricity and Development of Durable and Efficent NOx Reduction  

SciTech Connect (OSTI)

The objective of this project was to define the scope and cost of a technology research and development program that will demonstrate the feasibility of using an off-the-shelf, unmodified, large bore diesel powered generator in a grid-connected application, utilizing various blends of BioDiesel as fuel. Furthermore, the objective of project was to develop an emissions control device that uses a catalytic process and BioDiesel (without the presence of Ammonia or Urea)to reduce NOx and other pollutants present in a reciprocating engine exhaust stream with the goal of redefining the highest emission reduction efficiencies possible for a diesel reciprocating generator. Process: Caterpillar Power Generation adapted an off-the-shelf Diesel Generator to run on BioDiesel and various Petroleum Diesel/BioDiesel blends. EmeraChem developed and installed an exhaust gas cleanup system to reduce NOx, SOx, volatile organics, and particulates. The system design and function was optimized for emissions reduction with results in the 90-95% range;

Boyd, Rodney

2007-08-08T23:59:59.000Z

311

Clean Air Interstate Rule (released in AEO2009)  

Reports and Publications (EIA)

Clean Air Interstate Rule (CAIR) is a cap-and-trade program promulgated by the Environmental Protection Agency in 2005, covering 28 eastern U.S. states and the District of Columbia. It was designed to reduce sulfur dioxide (SO2) and nitrogen oxide (NOx) emissions in order to help states meet their National Ambient Air Quality Standards (NAAQS) for ozone and particulate matter (PM2.5) and to further emissions reductions already achieved through the Acid Rain Program and the NOx State Implementation Plan call program. The rule was set to commence in 2009 for seasonal and annual NOx emissions and in 2010 for SO2 emissions.

2009-01-01T23:59:59.000Z

312

Ozone induces glucose intolerance and systemic metabolic effects in young and aged brown Norway rats  

SciTech Connect (OSTI)

Air pollutants have been associated with increased diabetes in humans. We hypothesized that ozone would impair glucose homeostasis by altering insulin signaling and/or endoplasmic reticular (ER) stress in young and aged rats. One, 4, 12, and 24 month old Brown Norway (BN) rats were exposed to air or ozone, 0.25 or 1.0 ppm, 6 h/day for 2 days (acute) or 2 d/week for 13 weeks (subchronic). Additionally, 4 month old rats were exposed to air or 1.0 ppm ozone, 6 h/day for 1 or 2 days (time-course). Glucose tolerance tests (GTT) were performed immediately after exposure. Serum and tissue biomarkers were analyzed 18 h after final ozone for acute and subchronic studies, and immediately after each day of exposure in the time-course study. Age-related glucose intolerance and increases in metabolic biomarkers were apparent at baseline. Acute ozone caused hyperglycemia and glucose intolerance in rats of all ages. Ozone-induced glucose intolerance was reduced in rats exposed for 13 weeks. Acute, but not subchronic ozone increased ?{sub 2}-macroglobulin, adiponectin and osteopontin. Time-course analysis indicated glucose intolerance at days 1 and 2 (2 > 1), and a recovery 18 h post ozone. Leptin increased day 1 and epinephrine at all times after ozone. Ozone tended to decrease phosphorylated insulin receptor substrate-1 in liver and adipose tissues. ER stress appeared to be the consequence of ozone induced acute metabolic impairment since transcriptional markers of ER stress increased only after 2 days of ozone. In conclusion, acute ozone exposure induces marked systemic metabolic impairments in BN rats of all ages, likely through sympathetic stimulation. - Highlights: • Air pollutants have been associated with increased diabetes in humans. • Acute ozone exposure produces profound metabolic alterations in rats. • Age influences metabolic risk factors in aging BN rats. • Acute metabolic effects are reversible and repeated exposure reduces these effects. • Ozone metabolic effects are only slightly exacerbated in geriatric rats.

Bass, V. [Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Gordon, C.J.; Jarema, K.A.; MacPhail, R.C. [Toxicity Assessment Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Cascio, W.E. [Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Phillips, P.M. [Toxicity Assessment Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Ledbetter, A.D.; Schladweiler, M.C. [Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Andrews, D. [Research Cores Unit, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Miller, D. [Curriculum in Toxicology, University of North Carolina, Chapel Hill, NC (United States); Doerfler, D.L. [Research Cores Unit, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States); Kodavanti, U.P., E-mail: kodavanti.urmila@epa.gov [Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, NC (United States)

2013-12-15T23:59:59.000Z

313

Plasma Chemistry and Plasma Processing, Vol. 23, No. 3, September 2003 ( 2003) Ozone Production in the Negative DC Corona  

E-Print Network [OSTI]

: Corona discharge; corona plasma; plasma reacting flow; ozone; electrostatic precipitator; Damkohler

Chen, Junhong

314

Impact of different energies of precipitating particles on NOx1 generation in the middle and upper atmosphere during geomagnetic2  

E-Print Network [OSTI]

and energy spectra available today of solar proton events, auroral energy30 electrons, and relativistic1 Impact of different energies of precipitating particles on NOx1 generation in the middle a Sodankylä Geophysical Observatory, Tähteläntie 62, FI-99600 Sodankylä, Finland.8 b Earth Observation

Otago, University of

315

NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on ?-Al2O3. NOx uptake on alkaline earth oxides (BaO, MgO, CaO and SrO) supported on ?-Al2O3....

316

Increase in NOx Emissions from Indian Thermal Power Plants during 1996-2010: Unit-Based Inventories and Multisatellite Observations  

E-Print Network [OSTI]

and Multisatellite Observations Zifeng Lu* and David G. Streets Decision and Information Sciences Division, Argonne National Laboratory, Argonne, Illinois, United States *S Supporting Information ABSTRACT: Driven by rapid economic development and growing electricity demand, NOx emissions (E) from the power sector in India have

Jacob, Daniel J.

317

N-nitrosamine and N-nitramine Formation from NOx Reactions with Amines during Amine-Based CO2  

E-Print Network [OSTI]

Capture for Post-combustion Carbon Sequestration Background! Generation of electricity and heat from power- combustion carbon sequestration, the capture and underground storage of CO2 from the exhaust gases of power formation from NOx reactions with amines during amine-based carbon dioxide capture for postcombustion carbon

Mitch, William A.

318

Implications of near-term coal power plant retirement for SO2 and NOX, and life cycle GHG emissions  

E-Print Network [OSTI]

prices of electricity production Plant type Unit Price Nuclear ($/MWh) 16.51 Wind ($/MWh) 201 Hydro Top SO2 100 430 95 440 100 430 Top NOX 105 350 100 380 105 345 Small, inefficient 125 410 125 405 125) Manitoba Hydro Manitoba Hydro Undertaking # 57 http://www.pub.gov.mb.ca/exhibits/mh-83.pdf. (5) Sotkiewicz

Jaramillo, Paulina

319

Implications of Near-Term Coal Power Plant Retirement for SO2 and NOX and Life Cycle GHG Emissions  

E-Print Network [OSTI]

Implications of Near-Term Coal Power Plant Retirement for SO2 and NOX and Life Cycle GHG Emissions emissions in the U.S. will likely result in coal plant retirement in the near-term. Life cycle assessment for electricity generation, by comparing systems that consist of individual natural gas and coal power plants

Jaramillo, Paulina

320

DEVELOPMENT AND DEMONSTRATION OF AN ULTRA LOW NOx COMBUSTOR FOR GAS TURBINES  

SciTech Connect (OSTI)

Alzeta Corporation has developed surface-stabilized fuel injectors for use with lean premixed combustors which provide extended turndown and ultra-low NOX emission performance. These injectors use a patented technique to form interacting radiant and blue-flame zones immediately above a selectively-perforated porous metal surface. This allows stable operation at low reaction temperatures. This technology is being commercialized under the product name nanoSTAR. Initial tests demonstrated low NOX emissions but, were limited by flashback failure of the injectors. The weld seams required to form cylindrical injectors from flat sheet material were identified as the cause of the failures. The approach for this project was to first develop new fabrication methods to produce injectors without weld seams, verify similar emissions performance to the original flat sheet material and then develop products for microturbines and small gas turbines along parallel development paths. A 37 month project was completed to develop and test a surface stabilized combustion system for gas turbine applications. New fabrication techniques developed removed a technological barrier to the success of the product by elimination of conductive weld seams from the injector surface. The injectors demonstrated ultra low emissions in rig tests conducted under gas turbine operating conditions. The ability for injectors to share a common combustion chamber allowing for deployment in annular combustion liner was also demonstrated. Some further development is required to resolve integration issues related to specific engine constraints, but the nanoSTAR technology has clearly demonstrated its low emissions potential. The overall project conclusions can be summarized: (1) A wet-laid casting method successfully eliminated weld seams from the injector surface without degrading performance. (2) Gas turbine cycle analysis identified several injector designs and control schemes to start and load engines using nanoSTAR technology. A mechanically simple single zone injector can be used in Solar Turbine's Taurus 60 engine. (3) Rig testing of single monolithic injectors demonstrated sub 3 ppmv NOX and sub 10 ppmv CO and UHC emissions (all corrected to 15% O2) at Taurus 60 full-load pressure and combustion air inlet temperature. (4) Testing of two nanoSTAR injectors in Solar Turbine's sector rig demonstrated the ability for injectors to survive when fired in close proximity at Taurus 60 full load pressure and combustion air inlet temperature. (5) Sector rig tests demonstrated emissions performance and range of operability consistent with single injector rig tests. Alzeta has committed to the commercialization of nanoSTAR injectors and has sufficient production capability to conclude development and meet initial demand.

NEIL K. MCDOUGALD

2005-04-30T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Pilot-Scale Demonstration of ALTA for NOx Control in Pulverized Coal-Fired Boilers  

SciTech Connect (OSTI)

This report describes computational fluid dynamics (CFD) modeling and pilot-scale testing conducted to demonstrate the ability of the Advanced Layered Technology Approach (ALTA) to reduce NO{sub x} emissions in a pulverized coal (PC) boiler. Testing specifically focused on characterizing NO{sub x} behavior with deep burner staging combined with Rich Reagent Injection (RRI). Tests were performed in a 4 MBtu/hr pilot-scale furnace at the University of Utah. Reaction Engineering International (REI) led the project team which included the University of Utah and Combustion Components Associates (CCA). Deep burner staging and RRI, combined with selective non-catalytic reduction (SNCR), make up the Advanced Layered Technology Approach (ALTA) for NO{sub x} reduction. The application of ALTA in a PC environment requires homogenization and rapid reaction of post-burner combustion gases and has not been successfully demonstrated in the past. Operation of the existing low-NO{sub x} burner and design and operation of an application specific ALTA burner was guided by CFD modeling conducted by REI. Parametric pilot-scale testing proved the chemistry of RRI in a PC environment with a NOx reduction of 79% at long residence times and high baseline NOx rate. At representative particle residence times, typical operation of the dual-register low-NO{sub x} burner provided an environment that was unsuitable for NO{sub x} reduction by RRI, showing no NOx reduction. With RRI, the ALTA burner was able to produce NO{sub x} emissions 20% lower than the low-NO{sub x} burner, 76 ppmv vs. 94 ppmv, at a burner stoichiometric ratio (BSR) of 0.7 and a normalized stoichiometric ratio (NSR) of 2.0. CFD modeling was used to investigate the application of RRI for NO{sub x} control on a 180 MW{sub e} wall-fired, PC boiler. A NO{sub x} reduction of 37% from baseline (normal operation) was predicted using ALTA burners with RRI to produce a NO{sub x} emission rate of 0.185 lb/MBtu at the horizontal nose of the boiler. When combined with SNCR, a NO{sub x} emission rate of 0.12-0.14 lb/MBtu can be expected when implementing a full ALTA system on this unit. Cost effectiveness of the full ALTA system was estimated at $2,152/ton NO{sub x} removed; this was less than 75% of the cost estimated for an SCR system on a unit of this size.

Andrew Fry; Devin Davis; Marc Cremer; Bradley Adams

2008-04-30T23:59:59.000Z

322

Smart Grid Week: Hurricane Season and the Department's Efforts...  

Broader source: Energy.gov (indexed) [DOE]

Season and the Department's Efforts to Make the Grid More Resilient to Power Outages Smart Grid Week: Hurricane Season and the Department's Efforts to Make the Grid More...

323

Learning about ozone depletion Paul J. Crutzen & Michael Oppenheimer  

E-Print Network [OSTI]

Learning about ozone depletion Paul J. Crutzen & Michael Oppenheimer Received: 12 January 2007 Mainz, Germany M. Oppenheimer (*) Department of Geosciences, Princeton University, Princeton, NJ 08544, USA e-mail: omichael@princeton.edu M. Oppenheimer Woodrow Wilson School of Public and International

Oppenheimer, Michael

324

Investigation of the Atmospheric Ozone Impacts of Methyl Iodide  

E-Print Network [OSTI]

J. R. Holmes (1977): “Nitrogen Dioxide Photolysis in the LosO3 Ozone NO Nitric Oxide NO2 Nitrogen Dioxide NO3 NitrateNitrogen Pentoxide HONO Nitrous Acid HNO3 Nitric Acid HNO4 Peroxynitric Acid HO2H Hydrogen Peroxide CO Carbon Monoxide SO2 Sulfur Dioxide

Carter, W P L

2007-01-01T23:59:59.000Z

325

Effect of B20 and Low Aromatic Diesel on Transit Bus NOx Emissions Over Driving Cycles with a Range of Kinetic Intensity  

SciTech Connect (OSTI)

Oxides of nitrogen (NOx) emissions for transit buses for up to five different fuels and three standard transit duty cycles were compared to establish whether there is a real-world biodiesel NOx increase for transit bus duty cycles and engine calibrations. Six buses representing the majority of the current national transit fleet and including hybrid and selective catalyst reduction systems were tested on a heavy-duty chassis dynamometer with certification diesel, certification B20 blend, low aromatic (California Air Resources Board) diesel, low aromatic B20 blend, and B100 fuels over the Manhattan, Orange County and UDDS test cycles. Engine emissions certification level had the dominant effect on NOx; kinetic intensity was the secondary driving factor. The biodiesel effect on NOx emissions was not statistically significant for most buses and duty cycles for blends with certification diesel, except for a 2008 model year bus. CARB fuel had many more instances of a statistically significant effect of reducing NOx. SCR systems proved effective at reducing NOx to near the detection limit on all duty cycles and fuels, including B100. While offering a fuel economy benefit, a hybrid system significantly increased NOx emissions over a same year bus with a conventional drivetrain and the same engine.

Lammert, M. P.; McCormick, R. L.; Sindler, P.; Williams, A.

2012-10-01T23:59:59.000Z

326

NOx, SO{sub 3} in the spotlight at NETL's 2006 Environmental Controls conference  

SciTech Connect (OSTI)

As emissions caps drop, technological solutions must become increasingly effective and efficient. Researchers, equipment vendors, and plant operators are exploring alternatives to SCR and SNCR, with a view to reducing the overall costs of NOx reduction. They have also achieved 95% to 99% removal of SO{sub 3}, with no visible plume opacity. These topics were discussed at ECC 2006. The first conference session focussed on selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) control of nitrogen oxide emissions; the second session addressed the related issue of reducing stack emissions and flue gas concentrations of sulfur trioxide. The article summarises many papers presented. Summaries and/or full versions of all the papers mentioned, and others, are posted at www.netl.doe.gov/publications/proceedings/06/ecc/index.html. 2 figs.

Mann, A.N.; Makovsky, L.E.; Sarkus, T.A. [Technology and Management Services Inc. (United States)

2007-02-15T23:59:59.000Z

327

Method for reducing NOx during combustion of coal in a burner  

DOE Patents [OSTI]

An organically complexed nanocatalyst composition is applied to or mixed with coal prior to or upon introducing the coal into a coal burner in order to catalyze the removal of coal nitrogen from the coal and its conversion into nitrogen gas prior to combustion of the coal. This process leads to reduced NOx production during coal combustion. The nanocatalyst compositions include a nanoparticle catalyst that is made using a dispersing agent that can bond with the catalyst atoms. The dispersing agent forms stable, dispersed, nano-sized catalyst particles. The catalyst composition can be formed as a stable suspension to facilitate storage, transportation and application of the catalyst nanoparticles to a coal material. The catalyst composition can be applied before or after pulverizing the coal material or it may be injected directly into the coal burner together with pulverized coal.

Zhou, Bing (Cranbury, NJ); Parasher, Sukesh (Lawrenceville, NJ); Hare, Jeffrey J. (Provo, UT); Harding, N. Stanley (North Salt Lake, UT); Black, Stephanie E. (Sandy, UT); Johnson, Kenneth R. (Highland, UT)

2008-04-15T23:59:59.000Z

328

Vortex combustor for low NOX emissions when burning lean premixed high hydrogen content fuel  

DOE Patents [OSTI]

A trapped vortex combustor. The trapped vortex combustor is configured for receiving a lean premixed gaseous fuel and oxidant stream, where the fuel includes hydrogen gas. The trapped vortex combustor is configured to receive the lean premixed fuel and oxidant stream at a velocity which significantly exceeds combustion flame speed in a selected lean premixed fuel and oxidant mixture. The combustor is configured to operate at relatively high bulk fluid velocities while maintaining stable combustion, and low NOx emissions. The combustor is useful in gas turbines in a process of burning synfuels, as it offers the opportunity to avoid use of diluent gas to reduce combustion temperatures. The combustor also offers the possibility of avoiding the use of selected catalytic reaction units for removal of oxides of nitrogen from combustion gases exiting a gas turbine.

Steele, Robert C; Edmonds, Ryan G; Williams, Joseph T; Baldwin, Stephen P

2012-11-20T23:59:59.000Z

329

Vortex combustor for low NOx emissions when burning lean premixed high hydrogen content fuel  

DOE Patents [OSTI]

A trapped vortex combustor. The trapped vortex combustor is configured for receiving a lean premixed gaseous fuel and oxidant stream, where the fuel includes hydrogen gas. The trapped vortex combustor is configured to receive the lean premixed fuel and oxidant stream at a velocity which significantly exceeds combustion flame speed in a selected lean premixed fuel and oxidant mixture. The combustor is configured to operate at relatively high bulk fluid velocities while maintaining stable combustion, and low NOx emissions. The combustor is useful in gas turbines in a process of burning synfuels, as it offers the opportunity to avoid use of diluent gas to reduce combustion temperatures. The combustor also offers the possibility of avoiding the use of selected catalytic reaction units for removal of oxides of nitrogen from combustion gases exiting a gas turbine.

Steele, Robert C. (Woodinville, WA); Edmonds, Ryan G. (Renton, WA); Williams, Joseph T. (Kirkland, WA); Baldwin, Stephen P. (Winchester, MA)

2009-10-20T23:59:59.000Z

330

Task 3.15 -- Impacts of low-NOx combustion on fly ash and slagging. Semi-annual report, July 1--December 31, 1996  

SciTech Connect (OSTI)

With the advent of the Clean Air Act Amendments of 1990, the coal-fired power industry began a more accelerated move toward using low-NOx burner (LNB) technologies to reduce NOx emissions. Most LNBs incorporate less oxygen with the coal initially, creating a cooler and somewhat substoichiometric initial combustion zone, with additional oxygen added further on in the combustion process to complete char combustion. Another method used to achieve lower NOx emissions is to fire the coal substoichiometrically and add additional air through overfire air ports. Both of these methods create certain impacts on fireside performance that are different from conventional high-excess-air firing arrangements. Some of the impacts that have been noticed by the utility industry are higher levels of unburned carbon in the fly ash and bottom ash, increased boiler tube corrosion, higher particulate loadings on control devices, and changes in slagging in the main furnace. Work on the fundamental mechanisms of entrained ash and ash deposit formation during low-NOx combustion has been sparse. This project by the Energy and Environmental Research Center (EERC) focuses on the issues of entrained ash formation and slagging for low-NOx combustion systems in general. Time-resolved combustion tests under conventional and low-NOx conditions have been conducted to note particle-size formation and slagging deposition. The results from this work are yielding an increased understanding of the mechanisms of ash formation during low-NOx combustion along with methods for enhancing heat transfer and fly ash collectability. Specific objectives of this research project include (1) determining whether initial char and ash generated under low-NOx conditions have greater tendencies for slagging than conventionally generated ash and (2) determining the differences, if any, between particle size and composition for entrained ash generated under low-NOx and conventional combustion conditions.

Zygarlicke, C.J.; McCollor, D.P.

1997-08-01T23:59:59.000Z

331

The Exposure-Response Curve for Ozone and Risk of Mortality and the Adequacy of Current Ozone  

E-Print Network [OSTI]

and applied several statistical models to data on air pollution, weather, and mortality for 98 U.S. urban mortality. Interventions to further reduce ozone pollution would benefit public health, even in regions pollutant linked to numerous harmful health effects, including reduced lung function, increased frequency

Dominici, Francesca

332

NOVA Making Stuff Season 2  

SciTech Connect (OSTI)

Over the course of four weeks in fall 2013, 11.7 million Americans tuned in to PBS to follow host David Pogue as he led them in search of engineering and scientific breakthroughs poised to change our world. Levitating trains, quantum computers, robotic bees, and bomb-detecting plants—these were just a few of the cutting-edge innovations brought into the living rooms of families across the country in NOVA’s four-part series, Making Stuff: Faster, Wilder, Colder, and Safer. Each of the four one-hour programs gave viewers a behind-the-scenes look at novel technologies poised to change our world—showing them how basic research and scientific discovery can hold the keys to transforming how we live. Making Stuff Season 2 (MS2) combined true entertainment with educational value, creating a popular and engaging series that brought accessible science into the homes of millions. NOVA’s goal to engage the public with such technological innovation and basic research extended beyond the broadcast series, including a variety of online, educational, and promotional activities: original online science reporting, web-only short-form videos, a new online quiz-game, social media engagement and promotion, an educational outreach “toolkit” for science educators to create their own “makerspaces,” an online community of practice, a series of nationwide Innovation Cafés, educator professional development, a suite of teacher resources, an “Idealab,” participation in national conferences, and specialized station relation and marketing. A summative evaluation of the MS2 project indicates that overall, these activities helped make a significant impact on the viewers, users, and participants that NOVA reached. The final evaluation conducted by Concord Evaluation Group (CEG) confidently concluded that the broadcast, website, and outreach activities were successful at achieving the project’s intended impacts. CEG reported that the MS2 series and website content were successful in raising awareness and sparking interest in innovation, and increased public awareness that basic research leads to technological innovation; this interest was also sustained over a six month period. Efforts to create an online community of practice were also successful: the quality of collaboration increased, and community members felt supported while using Maker pedagogy. These findings provide clear evidence that large-scale science media projects like MS2 are an effective means of “moving the needle” on attitudes about and excitement for science. NOVA’s broadcast audience and ratings have always indicated that a large portion of the population is interested in and engages with educational science media on a weekly basis. Yet these evaluation results provide the empirical evidence that beyond being capable of attracting, maintaining, and growing a dedicated group of citizens interested in science, these shows—with their diverse content provided on a variety of media channels—are capable of sparking new interest in science, raising public awareness of the importance of science, and maintaining and growing that interest over time. In a country where approximately a quarter of the population doesn’t know the earth rotates around the sun,1 roughly half still don’t accept evolution,2 and about 20% don’t think climate change is happening,3 the importance of these findings cannot be overstated. The success of MS2 suggests that large-scale media projects dedicated to and linked by coverage of scientific “big ideas” are an effective means of shifting public opinion on—and improving understanding of—science. REFERENCES 1, 2 National Science Foundation, Science and Engineering Indicators (2014). Chapter 7: Science and Technology: Public Attitudes and Understanding. 3 Leiserowitz, A., Maibach, E., Roser-Renouf, C., Feinberg, G., & Rosenthal, S. (2014) Climate change in the American mind: April, 2014. Yale University and George Mason University. New Haven, CT: Yale Project on Climate Change Communication.

Leombruni, Lisa; Paulsen, Christine Andrews

2014-12-12T23:59:59.000Z

333

AVIAN NESTING DENSITY AND SUCCESS IN ALFALFA, COOL SEASON CRP, AND WARM SEASON CRP PLANTINGS IN EASTERN SOUTH DAKOTA  

E-Print Network [OSTI]

AVIAN NESTING DENSITY AND SUCCESS IN ALFALFA, COOL SEASON CRP, AND WARM SEASON CRP PLANTINGS;II AVIAN NESTING DENSITY AND SUCCESS IN ALFALFA, COOL SEASON CRP, AND WARM SEASON CRP PLANTINGS not have been completed. For those that allowed us to trample their alfalfa before it was cut, thank you

334

The Storage and Seasoning of Pecan Bud Wood.  

E-Print Network [OSTI]

be returned to cold storage and will remain ready for use at a later date. It has been found that bud wood cut late in the dormant period seasons in a shorter time than that cut early. Bud wood of the Delmas variety seasons more readiIy than that of Stuart... _._-_._.--__..__------~-..._..--_...._.--_.....-. Relation of Time of Cutting Bud Wood to Seasoning ._.__....._._-___._------------ ., Relative Response of Stuart and Delmas in Seasoning _---..__._.__....._.---....-....--.- 10 Number of Days for Seasoning Bud Wood During Different Months .... 12 Storage...

Brison, Fred R. (Fred Robert)

1933-01-01T23:59:59.000Z

335

Increasing background ozone during spring on the west coast of North America  

E-Print Network [OSTI]

on the respiratory system and vegetation damage at concentrations not far above ambient. In East Asia, NOx emissions are transported at least as far as North America by the same mechanism [Parrish et al., 1992; Jaffe et al., 1999

Silver, Whendee

336

Scale-Up and Demonstration of Fly Ash Ozonation Technology  

SciTech Connect (OSTI)

The disposal of fly ash from the combustion of coal has become increasingly important. When the fly ash does not meet the required specification for the product or market intended, it is necessary to beneficiate it to achieve the desired quality. This project, conducted at PPL's Montour SES, is the first near full-scale ({approx}10 ton/day), demonstration of ash ozonation technology. Bituminous and sub bituminous ashes, including two ash samples that contained activated carbon, were treated during the project. Results from the tests were very promising. The ashes were successfully treated with ozone, yielding concrete-suitable ash quality. Preliminary process cost estimates indicate that capital and operating costs to treat unburned carbon are competitive with other commercial ash beneficiation technologies at a fraction of the cost of lost sales and/or ash disposal costs. This is the final technical report under DOE Cooperative Agreement No.: DE-FC26-03NT41730.

Rui Afonso; R. Hurt; I. Kulaots

2006-03-01T23:59:59.000Z

337

CF[sub 3] chemistry: Potential implications for stratospheric ozone  

SciTech Connect (OSTI)

The authors address questions about the chemistry of CF[sub 3] bearing compounds in the atmosphere, and the impact that the existence of and reaction rate constants for such species may have on stratospheric ozone. Species considered include CF[sub 3], CF[sub 3]O, CF[sub 3]O[sub 2], CF[sub 3]OH, CF[sub 3]OOH, CF[sub 3]ONO[sub 2], CF[sub 3]O[sub 2]NO[sub 2], and CF[sub 3]OOCl. Based on their calculational results, the authors suggest a number of experimental measurements which should substantially decrease uncertainties associated with the role of CF[sub 3] species in atmospheric chemistry related to ozone.

Ko, M.K.W.; Sze, N.D.; Rodriguez, J.M.; Weistenstein, D.K.; Heisey, C.W. (Atmospheric and Environmental Research, Inc., Cambridge, MA (United States)); Wayne, R.P.; Biggs, P.; Canosa-Mas, C.E. (Univ. of Oxford, Oxford (United Kingdom)); Sidebottom, H.W.; Treacy, J. (Univ. College, Dublin (Ireland))

1994-01-15T23:59:59.000Z

338

FORMATION OF MOLECULAR OXYGEN AND OZONE ON AMORPHOUS SILICATES  

SciTech Connect (OSTI)

Oxygen in the interstellar medium is seen in the gas phase, in ices (incorporated in H{sub 2}O, CO, and CO{sub 2}), and in grains such as (Mg{sub x} Fe{sub 1-x} )SiO{sub 3} or (Mg{sub x} Fe{sub 1-x} ){sub 2}SiO{sub 4}, 0 < x < 1. In this investigation, we study the diffusion of oxygen atoms and the formation of oxygen molecules and ozone on the surface of an amorphous silicate film. We find that ozone is formed at low temperature (<30 K), and molecular oxygen forms when the diffusion of oxygen atoms becomes significant, at around 60 K. This experiment, besides being the first determination of the diffusion energy barrier (1785 {+-} 35 K) for oxygen atoms on a silicate surface, suggests bare silicates as a possible storage place for oxygen atoms in low-A{sub v} environments.

Jing Dapeng; He Jiao; Vidali, Gianfranco [Physics Department, Syracuse University, Syracuse, NY 13244 (United States); Brucato, John Robert; Tozzetti, Lorenzo [Osservatorio Astrofisico di Arcetri, INAF, I-50125 Florence (Italy); De Sio, Antonio [Department of Physics and Astronomy, University of Florence, I-50125 Florence (Italy)

2012-09-01T23:59:59.000Z

339

Meeting the New Ozone Standard: Challenges and Opportunities  

Broader source: Energy.gov [DOE]

This presentation by Anna Garcia, executive director of the Ozone Transport Commission, was part of the July 2008 Webcast sponsored by the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Weatherization and Intergovernmental Program Clean Energy and Air Quality Integration Initiative that was titled Role of Energy Efficiency and Renewable Energy in Improving Air Quality and Addressing Greenhouse Gas Reduction Goals on High Electric Demand Days.

340

Selective catalytic reduction system and process for treating NOx emissions using a palladium and rhodium or ruthenium catalyst  

SciTech Connect (OSTI)

A process for the catalytic reduction of nitrogen oxides (NOx) in a gas stream (29) in the presence of H.sub.2 is provided. The process comprises contacting the gas stream with a catalyst system (38) comprising zirconia-silica washcoat particles (41), a pre-sulfated zirconia binder (44), and a catalyst combination (40) comprising palladium and at least one of rhodium, ruthenium, or a mixture of ruthenium and rhodium.

Sobolevskiy, Anatoly (Orlando, FL); Rossin, Joseph A. (Columbus, OH); Knapke, Michael J. (Columbus, OH)

2011-07-12T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

E-Print Network 3.0 - arctic ozone loss Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Chemistry Summary: stratospheric ozone losses during cold Arctic Januaries, M. Rex, R. J. Salaw- itch, M. L. Santee, J. W. Waters... , and UARS MLS to demonstrate that the...

342

E-Print Network 3.0 - atmospheric ozone depletion Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

78992007 Summary: ozone depletion based on sequential assimilation of satellite data from the ENVISATMIPAS and Odin... 2007 Abstract. The objective of this study...

343

E-Print Network 3.0 - ambient ozone exposure Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Materials Science ; Energy Storage, Conversion and Utilization 12 Proceedings of Healthy Buildings 2009 Paper 141 Removal of Indoor Ozone with Reactive Materials: Preliminary...

344

E-Print Network 3.0 - atmospheric ozone increases Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Environmental Sciences and Ecology ; Geosciences 78 Proceedings of Healthy Buildings 2009 Paper 336 Time-Scale Analysis for Reactive Deposition of Ozone via Passive...

345

E-Print Network 3.0 - ameliorate ozone effects Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: students confuse the relationship between the ozone hole and the greenhouse effect, thus confusing... , and to suggest more effective teaching methods. 2....

346

E-Print Network 3.0 - analyzing ground ozone Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

are analyzed... to superposition of the "natural" pro- cesses. Comparison of the total ozone ... Source: Ecole Polytechnique, Centre de mathmatiques Collection:...

347

NOx, FINE PARTICLE AND TOXIC METAL EMISSIONS FROM THE COMBUSTION OF SEWAGE SLUDGE/COAL MIXTURES: A SYSTEMATIC ASSESSMENT  

SciTech Connect (OSTI)

This research project focuses on pollutants from the combustion of mixtures of dried municipal sewage sludge (MSS) and coal. The objective is to determine the relationship between (1) fraction sludge in the sludge/coal mixture, and (2) combustion conditions on (a) NOx concentrations in the exhaust, (b) the size segregated fine and ultra-fine particle composition in the exhaust, and (c) the partitioning of toxic metals between vapor and condenses phases, within the process. The proposed study will be conducted in concert with an existing ongoing research on toxic metal partitioning mechanisms for very well characterized pulverized coals alone. Both high NOx and low NOx combustion conditions will be investigated (unstaged and staged combustion). Tradeoffs between CO{sub 2} control, NO{sub x} control, and inorganic fine particle and toxic metal emissions will be determined. Previous research results have demonstrated that the inhalation of coal/MSS ash particles cause an increase in lung permeability than coal ash particles alone. Elemental analysis of the coal/MSS ash particles showed that Zn was more abundant in these ash particles than the ash particles of coal ash alone.

Jost O.L. Wendt

2003-01-31T23:59:59.000Z

348

Economics of pollution trading for SO{sub 2} and NOx  

SciTech Connect (OSTI)

For years economists have urged policymakers to use market-based approaches such as cap-and-trade programs or emission taxes to control pollution. The sulphur dioxide (SO{sub 2}) allowance market created by Title IV of the 1990 US Clean Air Act Amendments represents the first real test of the wisdom of economists' advice. Subsequent urban and regional applications of NOx emission allowance trading took shape in the 1990s in the United States, culminating in a second large experiment in emission trading in the eastern United States that began in 2003. This paper provides an overview of the economic rationale for emission trading and a description of the major US programs for SO{sub 2} and nitrogen oxides. These programs are evaluated along measures of performance including cost savings, environmental integrity, and incentives for technological innovation. The authors offer lessons for the design of future programs including, most importantly, those reducing carbon dioxide. 128 refs., 1 fig., 1 tab.

Dallas Burtraw; David A. Evans; Alan Krupnick; Karen Palmer; Russell Toth

2005-03-15T23:59:59.000Z

349

Thermal Durability of Cu-CHA NH3-SCR Catalysts for Diesel NOx Reduction  

SciTech Connect (OSTI)

Multiple catalytic functions (NOx conversion, NO and NH3 oxidation, NH3 storage) of a commercial Cu-zeolite urea/NH3-SCR catalyst were assessed in a laboratory fixed-bed flow reactor system after differing degrees of hydrothermal aging. Catalysts were characterized by using x-ray diffraction (XRD), 27Al solid state nuclear magnetic resonance (NMR) and transmission electron microscopy (TEM) / energy dispersive X-ray (EDX) spectroscopy to develop an understanding of the degradation mechanisms during catalyst aging. The catalytic reaction measurements of laboratory-aged catalysts were performed, which allows us to obtain a universal curve for predicting the degree of catalyst performance deterioration as a function of time at each aging temperature. Results show that as the aging temperature becomes higher, the zeolite structure collapses in a shorter period of time after an induction period. The decrease in SCR performance was explained by zeolite structure destruction and/or Cu agglomeration, as detected by XRD/27Al NMR and by TEM/EDX, respectively. Destruction of the zeolite structure and agglomeration of the active phase also results in a decrease in the NO/NH3 oxidation activity and the NH3 storage capacity of the catalyst. Selected laboratory aging conditions (16 h at 800oC) compare well with a 135,000 mile vehicle-aged catalyst for both performance and characterization criteria.

Schmieg, Steven J.; Oh, Se H.; Kim, Chang H.; Brown, David B.; Lee, Jong H.; Peden, Charles HF; Kim, Do Heui

2012-04-30T23:59:59.000Z

350

SEPEMO-Build SEasonal PErformance MOnitoring  

E-Print Network [OSTI]

· Etten-Leur is to achieve energy-neutral building for new developments by 2020. · Schoenmakershoek and energy-neutral development · From the onset of the project heat pumps are an integral part of this visionSEPEMO-Build SEasonal PErformance MOnitoring Roger Nordman, roger.nordman@sp.se SP Sveriges

Oak Ridge National Laboratory

351

What's in Season from the Garden State  

E-Print Network [OSTI]

in the system. New Jersey is deficient in a distribution mechanism which respects and embraces seasonality or restaurants or have refrigerated trucks for deliveries. What the New Jersey wholesale produce distribution it with Jersey and bridge the gap in the system: Gaurino Sons Produce and Zone 7. Guarino Sons Produce Long

Goodman, Robert M.

352

Potential for seasonal power oversupply in 2013  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

202013 B O N N E V I L L E P O W E R A D M I N I S T R A T I O N Potential for seasonal power oversupply in 2013 BPA has estimated the amount of wind generation that could be...

353

Plasma Chemistry and Plasma Processing, Vol. 22, No. 4, December 2002 ( 2002) Ozone Production in the Positive DC Corona  

E-Print Network [OSTI]

Plasma Chemistry and Plasma Processing, Vol. 22, No. 4, December 2002 ( 2002) Ozone Production the distribution of ozone, but does not affect the rate of production. KEY WORDS: Corona discharge; corona plasma

Chen, Junhong

354

EA-1472: Commercial Demonstration fo the Low Nox Burner/Separated Over-Fire Air (LNB/SOFA) Integration System Emission Reduction Technology, Holcolm Station, Sunflower Electric Power Corporation Finnety County, Kansas  

Broader source: Energy.gov [DOE]

The DOE has prepared an Environmental Assessment (EA), to analyze the potential impacts of the commercial application of the Low-NOx Burner/Separated Over-Fire Air (LNB/SOFA) integration system to achieve nitrogen oxide (NOx) emissions reduction at Sunflower’s Holcomb Unit No. 1 (Holcomb Station), located near Garden City, in Finney County, Kansas. The Holcomb Station would be modified in three distinct phases to demonstrate the synergistic effect of layering NOx control technologies.

355

Ground-based zenith sky abundances and in situ gas cross sections for ozone and nitrogen dioxide  

E-Print Network [OSTI]

Ground-based zenith sky abundances and in situ gas cross sections for ozone and nitrogen dioxide, in situ ambient absorption gas cell mea- surements for ozone and nitrogen dioxide, and ground-based zenith for ozone and nitrogen dioxide that are retrieved from measured spectra of the zenith sky

Dirksen, Ruud

356

Ensemble forecasting with machine learning algorithms for ozone, nitrogen dioxide and PM10 on the Prev'Air  

E-Print Network [OSTI]

Ensemble forecasting with machine learning algorithms for ozone, nitrogen dioxide and PM10'Air operational platform. This platform aims at forecasting maps, on a daily basis, for ozone, nitrogen dioxide models, ozone, nitrogen dioxide, particulate matter, threshold exceedance 1. Introduction1 Operational

Mallet, Vivien

357

Experimental study of reactions between ozone and building products M. Nicolas, O. Ramalho, F. Maupetit*  

E-Print Network [OSTI]

ozone and building products and document their potential impact on indoor air quality. PreliminaryExperimental study of reactions between ozone and building products M. Nicolas, O. Ramalho, F experiments were conducted on four building products: two carpets, a gypsum board and a pine wood board

Paris-Sud XI, Université de

358

Validation of Ozone Monitoring Instrument nitrogen dioxide columns E. A. Celarier,1  

E-Print Network [OSTI]

Validation of Ozone Monitoring Instrument nitrogen dioxide columns E. A. Celarier,1 E. J. Brinksma the standard nitrogen dioxide (NO2) data product (Version 1.0.), which is based on measurements made), Validation of Ozone Monitoring Instrument nitrogen dioxide columns, J. Geophys. Res., 113, D15S15, doi:10

359

Ground-level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring Instrument  

E-Print Network [OSTI]

Ground-level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring; published 28 August 2008. [1] We present an approach to infer ground-level nitrogen dioxide (NO2), Ground-level nitrogen dioxide concentrations inferred from the satellite-borne Ozone Monitoring

Martin, Randall

360

Satellite observations of ozone and nitrogen dioxide: from retrievals to emission estimates  

E-Print Network [OSTI]

Summary Satellite observations of ozone and nitrogen dioxide: from retrievals to emission estimates be inferred for important trace gases such as ozone (O3) and nitrogen dioxide (NO2). Chemical transport models.11 to 3.79. Total nitrogen dioxide columns can be retrieved from space in the 405­465 nm window

Haak, Hein

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Tropospheric ozone trends at Mauna Loa Observatory tied to decadal climate variability  

E-Print Network [OSTI]

measurements at Mauna Loa Observatory in Hawaii reveal little change in tropospheric ozone levels during spring a suite of chemistry­climate model simulations. We show that the flow of ozone-rich air from Eurasia towards Hawaii during spring weakened in the 2000s as a result of La-Niña-like decadal cooling

362

PPPL-3281, Preprint: January 1998, UC-426 Synthesis of Ozone at Atmospheric Pressure  

E-Print Network [OSTI]

to ~250 ppm were produced using a thermal plasma reactor system based on an ICP torch operating at 2.5 MHz by rapid mixing of molecular oxygen with atomic oxygen produced by the torch. The ozone concentration in industrial processes is increasing. Applications for ozone include treatment of waste water, water

363

Separating the dynamical effects of climate change and ozone depletion. Part  

E-Print Network [OSTI]

) fixed at 1960 levels and ozone depleting substances (ODSs) varying in time, 2) ODSs fixed at 1960 levels averaged wave drag in SH spring and summer, as well as for final warming dates. Ozone depletion a significant impact on the stratosphere on both a global and a regional scale. Over the past three decades

Wirosoetisno, Djoko

364

Chapter Descriptions, Parties Request, and Timetable 2010 WMO/UNEP Ozone Assessment  

E-Print Network [OSTI]

AND SURFACE ULTRAVIOLET RADIATION CHAPTER 3: FUTURE OZONE AND ITS IMPACT ON SURFACE UV CHAPTER 4) of this 2010 ozone assessment. It provides updated information on degradation products which could have of understanding on ODS degradation products in the stratosphere (e.g., HCl, HF, BrO, CF2O), examines how

Jánosi, Imre M.

365

The Role of Material Porosity on Ozone Uptake for Metakaolin-Concrete Surfaces  

E-Print Network [OSTI]

to a diminished environmental impact, clay may cause increased removal of ozone, an important indoor pollutant velocity, Heterogeneous Chemistry, Construction Materials 1 Introduction Metakaolin-cement systems hold ozone uptake. Cement is an essential component in the building industry used in formulating concrete

Siegel, Jeffrey

366

Simultaneous retrievals of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements  

E-Print Network [OSTI]

of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements, JSimultaneous retrievals of column ozone and aerosol optical properties from direct and diffuse solar irradiance measurements Christian D. Goering,1 Tristan S. L'Ecuyer,1 Graeme L. Stephens,1 James R

Stephens, Graeme L.

367

Effects of Sodium Chloride Particles, Ozone, UV, and Relative Humidity on Atmospheric Corrosion of Silver  

E-Print Network [OSTI]

Effects of Sodium Chloride Particles, Ozone, UV, and Relative Humidity on Atmospheric Corrosion The corrosion of Ag contaminated with NaCl particles in gaseous environments containing humidity and ozone analyzed using a coulometric reduction technique. The atmospheric corrosion of Ag was greatly accelerated

368

Air Pollution Physics and Chemistry EAS 6790 Home Work Assignment Ozone Chemistry 2  

E-Print Network [OSTI]

1 Air Pollution Physics and Chemistry EAS 6790 Fall 2010 Home Work Assignment Ozone Chemistry 2 and Chemistry EAS 6790 Fall 2006 Home Work Assignment No. 4, Ozone Chemistry Problems 11.8 and 11.9 (sub-part 1 and 2 only). Daniel Jacob, Atmospheric Chemistry #12;2 Problem 2: 2 2. Consider an air parcel ventilated

Weber, Rodney

369

Can ozone depletion and global warming interact to produce rapid climate change?  

E-Print Network [OSTI]

Can ozone depletion and global warming interact to produce rapid climate change? Dennis L. Hartmann of Climate Change (IPCC) assess- ment of the status of global warming, which reported that winter stratospheric ozone depletion and greenhouse warming are possible. These interactions may be responsible

Limpasuvan, Varavut

370

NORTHEASTERN NATURALIST2009 16(2):307313 Variation in Ozone Sensitivity Within Indian Hemp and  

E-Print Network [OSTI]

NORTHEASTERN NATURALIST2009 16(2):307­313 Variation in Ozone Sensitivity Within Indian Hemp , and Dennis R. Decoteau1 Abstract - Sixteen selections of Apocynum cannabinum (Indian Hemp) and nine, adaxial stipple, similar to symptoms ascribed to ambient ozone in the field. Indian Hemp was more

Decoteau, Dennis R.

371

Surface ozone background in the United States: Canadian and Mexican pollution influences  

E-Print Network [OSTI]

of anthropogenic emissions from Canada, Mexico, and outside North America on daily maximum 8-hour average ozone Surface ozone Air quality standard Chemical transport model Global model a b s t r a c t We use a global chemical transport model (GEOS-Chem) with 1 Ã? 1 horizontal resolution to quantify the effects

Park, Rokjin

372

Stratospheric ozone depletion: a key driver of recent precipitation trends in South Eastern South America  

E-Print Network [OSTI]

. In this paper we focus on South Eastern South America (SESA), a region that has exhibited one of the largest South America 1 Introduction The depletion of ozone in the polar Antarctic strato- sphere (i.e. `theStratospheric ozone depletion: a key driver of recent precipitation trends in South Eastern South

373

Tropospheric ozone climatology over Irene, South Africa, from 1990 to 1994 and 1998 to 2002  

E-Print Network [OSTI]

Tropospheric ozone climatology over Irene, South Africa, from 1990 to 1994 and 1998 to 2002 R. D in South Africa are reported for the period 1990 to 1994 and a more recent period, 1998 to 2002, when), Tropospheric ozone climatology over Irene, South Africa, from 1990 to 1994 and 1998 to 2002, J. Geophys. Res

Thompson, Anne

374

Passive Ozone Control Through Use of Reactive Indoor Wall and Ceiling Materials  

E-Print Network [OSTI]

Passive Ozone Control Through Use of Reactive Indoor Wall and Ceiling Materials Paper # 715 Donna A and unpainted drywall as passive ozone control surfaces in a room-sized laboratory chamber. Mean deposition-50%, resulted in increased reactivity for activated carbon. In our model for a typical house, about 35

Siegel, Jeffrey

375

Original article Belowground biomass seasonal variation in two  

E-Print Network [OSTI]

Original article Belowground biomass seasonal variation in two Neotropical savannahs (Brazilian March 2001) Abstract ­ The belowground biomass of two types of ecosystems, frequently burned open by flotation and sieving. Belowground biomass showed significant seasonal variation, values being higher during

Paris-Sud XI, Université de

376

ALEXANDRU MIHAIL FLORIAN TOMESCU PROBING THE SEASONALITY SIGNAL IN POLLEN  

E-Print Network [OSTI]

OF ENEOLITHIC COPROLITES (H�ROVA- TELL, CONSTANA COUNTY, SOUTHEAST ROMANIA at Hârova-tell (Constana County, southeast Romania) were analyzed to test for seasonality signals, coprolites, seasonality, Eneolithic, Gumelnia culture, Romania. Pollen and spore spectra of coprolites

Tomescu, Alexandru MF

377

Pacific Adaptation Strategy Assistance Program Dynamical Seasonal Forecasting  

E-Print Network [OSTI]

Pacific Adaptation Strategy Assistance Program Dynamical Seasonal Forecasting Seasonal Prediction · POAMA · Issues for future Outline #12;Pacific Adaptation Strategy Assistance Program Major source Adaptation Strategy Assistance Program El Nino Mean State · Easterlies westward surface current upwelling

Lim, Eun-pa

378

St. Augustinegrass Warm-season turfgrass. Prefers full sun, but  

E-Print Network [OSTI]

St. Augustinegrass Warm-season turfgrass. Prefers full sun, but has a high tolerance for shade-season grass. It does best in full sun and high temperatures. Goes dormant and turns brown in winter. Very

Ishida, Yuko

379

Warm-Season (C4) Grasses Lowell E. Moser  

E-Print Network [OSTI]

-season perennial grasses as biomass feedstock candidates (Table II-I). Most of this research has focused

380

Feasibility of seasonal multipurpose reservoir operation in Texas  

E-Print Network [OSTI]

constant top of conservation pool elevation. Managing Texas reservoirs by seasonal rule curve operation shows the potential for increasing the firm yield from a reservoir and at the same time decreasing damages due to flooding. However, seasonal rule... Framework for Reservoir Management . . Flood Control Versus Conservation Purposes Conservation Operations . Flood Control Operations Operating Procedures Seasonal Rule Curve Operation in Texas CHAPTER III SEASONAL FACTORS AFFECTING RESERVOIR OPERATION...

Tibbets, Michael N

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

The 2007 North Atlantic Hurricane Season A Climate Perspective  

E-Print Network [OSTI]

Atmospheric Administration(NOAA)AccumulatedCyclone Energy (ACE) index (Bell et al. 2000), a measure of the season's overall

382

AT 351 Lab 3: Seasons and Surface Temperature (Ch. 3)  

E-Print Network [OSTI]

an important role in an area's local vertical temperature distribution. Below, Figure 1 shows the verticalAT 351 Lab 3: Seasons and Surface Temperature (Ch. 3) Question #1: Seasons (20 pts) A. In your own words, describe the cause of the seasons. B. In the Northern Hemisphere we are closer to the sun during

Rutledge, Steven

383

Heating Season Has Ended An Update On The Numbers  

E-Print Network [OSTI]

Heating Season Has Ended An Update On The Numbers Heating Season Has Ended The snow in the mid to last at least 10 days!! So, we are declaring an end to the heating season and entering late into what temperature dip. As you likely do at home, please be mindful of the weather forecast and adjust accordingly

384

The seasonal cycle dependence of temperature fluctuations in the atmosphere  

E-Print Network [OSTI]

to determine how the seasonal cycle of temperature fluctuations should be simulated in noise-forced energy balance models. It is shown that the length scale does have a seasonal dependence and will have to be handled through the seasonal modulation of other...

Tobin, Bridget Frances

1994-01-01T23:59:59.000Z

385

Identifying seasonal stars in Kaurna astronomical traditions  

E-Print Network [OSTI]

Early ethnographers and missionaries recorded Aboriginal languages and oral traditions across Australia. Their general lack of astronomical training resulted in misidentifications, transcription errors, and omissions in these records. Additionally, many of these early records are fragmented. In western Victoria and southeast South Australia, many astronomical traditions were recorded, but curiously, some of the brightest stars in the sky were omitted. Scholars claimed these stars did not feature in Aboriginal traditions. This under-representation continues to be repeated in the literature, but current research shows that some of these stars may in fact feature in Aboriginal traditions and could be seasonal calendar markers. This paper uses established techniques in cultural astronomy to identify seasonal stars in the traditions of the Kaurna Aboriginal people of the Adelaide Plains, South Australia.

Hamacher, Duane W

2015-01-01T23:59:59.000Z

386

Managing Warm-season Improved Pastures  

E-Print Network [OSTI]

. However, west of a line from Corpus Christi through San Antonio to Fort Worth, rainfall is greatly reduced year round and spring calving is preferred. The rainfall pattern in this area corresponds to for- age production as shown in Fig. 1. Spring calving... season corresponds to better forage quality and quantity in native rangeland and improved pastures. Because improved small grain pastures must be irrigated in many areas of west Texas, the cost of producing improved winter forages for cow-calf op...

Stichler, Charles; Prostko, Eric P.; Livingston, Stephen

1998-10-09T23:59:59.000Z

387

Influences on seasonal ski worker intention to return and indicators and standards of quality for seasonal ski jobs  

E-Print Network [OSTI]

of the requirements for the degree of MASTER OF SCIENCF. August 2002 Major Subject: Recreation, Park and Tourism Sciences INFLUENCES ON SEASONAL SKI WORKER INTENTION TO RETURN AND INDICATORS AND STANDARDS OF QUALiTY FOR SEASONAL SKI JOBS A Thesis By MATTHEW D... 'Lear (He c of partment) August 2002 Major Subject: Recreation, Park and Tourism Sciences ABSTRACT Influences on Seasonal Ski Worker Intention to Return and Indicators and Standards of Quality for Seasonal Ski Jobs. (August 2002) Matthew D. Ismert...

Ismert, Matthew D

2012-06-07T23:59:59.000Z

388

A computational investigation of diesel and biodiesel combustion and NOx formation in a light-duty compression ignition engine  

SciTech Connect (OSTI)

Diesel and biodiesel combustion in a multi-cylinder light duty diesel engine were simulated during a closed cycle (from IVC to EVO), using a commercial computational fluid dynamics (CFD) code, CONVERGE, coupled with detailed chemical kinetics. The computational domain was constructed based on engine geometry and compression ratio measurements. A skeletal n-heptane-based diesel mechanism developed by researchers at Chalmers University of Technology and a reduced biodiesel mechanism derived and validated by Luo and co-workers were applied to model the combustion chemistry. The biodiesel mechanism contains 89 species and 364 reactions and uses methyl decanoate, methyl-9- decenoate, and n-heptane as the surrogate fuel mixture. The Kelvin-Helmholtz and Rayleigh-Taylor (KH-RT) spray breakup model for diesel and biodiesel was calibrated to account for the differences in physical properties of the fuels which result in variations in atomization and spray development characteristics. The simulations were able to capture the experimentally observed pressure and apparent heat release rate trends for both the fuels over a range of engine loads (BMEPs from 2.5 to 10 bar) and fuel injection timings (from 0���° BTDC to 10���° BTDC), thus validating the overall modeling approach as well as the chemical kinetic models of diesel and biodiesel surrogates. Moreover, quantitative NOx predictions for diesel combustion and qualitative NOx predictions for biodiesel combustion were obtained with the CFD simulations and the in-cylinder temperature trends were correlated to the NOx trends."

Wang, Zihan; Srinivasan, Kalyan K.; Krishnan, Sundar R.; Som, Sibendu

2012-04-24T23:59:59.000Z

389

SELECTIVE REDUCTION OF NOX IN OXYGEN RICH ENVIRONMENTS WITH PLASMA-ASSISTED CATALYSIS: CATALYST DEVELOPMENT AND MECHANISTIC STUDIES  

SciTech Connect (OSTI)

The control of NOx (NO and NO2) emissions from so-called ''lean-burn'' vehicle engines remains a challenge. In recent years, there have been a number of reports that show that a plasma device combined with a catalyst can reduce as high as 90% or more of NOx in simulated diesel and other ''lean-burn'' exhaust. In the case of propylene containing simulated diesel exhaust, the beneficial role of a plasma treatment is now thought to be due to oxidation of NO to NO2, and the formation of partially oxidized hydrocarbons that are more active for the catalytic reduction of NO2 than propylene. Thus, the overall system can be most usefully described as hydrocarbon selective catalytic reduction (SCR) enhanced by 'reforming' the exhaust with a non-thermal plasma (NTP) device. For plasma-enhanced catalysis, both zeolite- and alumina-based materials have shown high activity, albeit in somewhat different temperature ranges, when preceded by an NTP reactor. This paper will briefly describe our research efforts aimed at optimizing the catalyst materials for NTP-catalysis devices based, in part, on our continuing studies of the NTP- and catalytic-reaction mechanisms. Various alkali- and alkaline earth-cation-exchanged Y zeolites have been prepared, their material properties characterized, and they have been tested as catalytic materials for NOx reduction in laboratory NTP-catalysis reactors. Interestingly, NO2 formed in the plasma and not subsequently removed over these catalysts, will back-convert to NO, albeit to varying extents depending upon the nature of the cation. Besides this comparative reactivity, we will also discuss selected synthesis strategies for enhancing the performance of these zeolite-based catalyst materials. A particularly important result from our mechanistic studies is the observation that aldehydes, formed during the plasma treatment of simulated diesel exhaust, are the important species for the reduction of NOx to N2. Indeed, acetaldehyde has been found to be especially effective in the thermal reduction of both NO and NO2 over Ba- and Na-Y zeolite catalysts.

Peden, C; Barlow, S; Hoard, J; Kwak, J; *Balmer-Millar, M; *Panov, A; Schmieg, S; Szanyi, J; Tonkyn, R

2003-08-24T23:59:59.000Z

390

Development of a Low NOx Medium sized Industrial Gas Turbine Operating on Hydrogen-Rich Renewable and Opportunity Fuels  

SciTech Connect (OSTI)

This report presents the accomplishments at the completion of the DOE sponsored project (Contract # DE-FC26-09NT05873) undertaken by Solar Turbines Incorporated. The objective of this 54-month project was to develop a low NOx combustion system for a medium sized industrial gas turbine engine operating on Hydrogen-rich renewable and opportunity Fuels. The work in this project was focused on development of a combustion system sized for 15MW Titan 130 gas turbine engine based on design analysis and rig test results. Although detailed engine evaluation of the complete system is required prior to commercial application, those tasks were beyond the scope of this DOE sponsored project. The project tasks were organized in three stages, Stages 2 through 4. In Stage 2 of this project, Solar Turbines Incorporated characterized the low emission capability of current Titan 130 SoLoNOx fuel injector while operating on a matrix of fuel blends with varying Hydrogen concentration. The mapping in this phase was performed on a fuel injector designed for natural gas operation. Favorable test results were obtained in this phase on emissions and operability. However, the resulting fuel supply pressure needed to operate the engine with the lower Wobbe Index opportunity fuels would require additional gas compression, resulting in parasitic load and reduced thermal efficiency. In Stage 3, Solar characterized the pressure loss in the fuel injector and developed modifications to the fuel injection system through detailed network analysis. In this modification, only the fuel delivery flowpath was modified and the air-side of the injector and the premixing passages were not altered. The modified injector was fabricated and tested and verified to produce similar operability and emissions as the Stage 2 results. In parallel, Solar also fabricated a dual fuel capable injector with the same air-side flowpath to improve commercialization potential. This injector was also test verified to produce 15-ppm NOx capability on high Hydrogen fuels. In Stage 4, Solar fabricated a complete set of injectors and a combustor liner to test the system capability in a full-scale atmospheric rig. Extensive high-pressure single injector rig test results show that 15-ppm NOx guarantee is achievable from 50% to 100% Load with fuel blends containing up to 65% Hydrogen. Because of safety limitations in Solar Test Facility, the atmospheric rig tests were limited to methane-based fuel blends. Further work to validate the durability and installed engine capability would require long-term engine field test.

Srinivasan, Ram

2013-07-31T23:59:59.000Z

391

Calculation of NOx Emission Reduction from Implementation of the 2000 IECC/IRC Conservation Code in Texas  

E-Print Network [OSTI]

building prototypes, which will be constructed to be representative of the new building construction in Texas. 12 The NAHB characteristics divided the state into east (E), and west (W) divisions: window-to-wall area E=15.28%, W=20.6%, glazing U.... Division (East and West Texas): From NAHB survey data. 17. AFUE (%),SEER and Water Heater Efficiency for 1999 standard and IECC 2000 house are 80%, 11 and 76%, respectively. Table 1: 2002 NOx emissions reductions from implementation of the 2000 IECC...

Turner, W. D.; Yazdani, B.; Im, P.; Verdict, M.; Bryant, J.; Fitzpatrick, T.; Haberl, J. S.; Culp, C.

2003-01-01T23:59:59.000Z

392

Ozone-depleting-substance control and phase-out plan  

SciTech Connect (OSTI)

Title VI of the Federal Clean Air Act Amendments of 1990 requires regulation of the use and disposal of ozone-depleting substances (ODSs) (e.g., Halon, Freon). Several important federal regulations have been promulgated that affect the use of such substances at the Hanford Site. On April 23, 1993, Executive Order (EO) 12843, Procurement Requirements and Policies for Federal Agencies for Ozone-Depleting Substances (EPA 1993) was issued for Federal facilities to conform to the new US Environmental Protection Agency (EPA) regulations implementing the Clean Air Act of 1963 (CAA), Section 613, as amended. To implement the requirements of Title VI the US Department of Energy, Richland Operations Office (RL), issued a directive to the Hanford Site contractors on May 25, 1994 (Wisness 1994). The directive assigns Westinghouse Hanford Company (WHC) the lead in coordinating the development of a sitewide comprehensive implementation plan to be drafted by July 29, 1994 and completed by September 30, 1994. The implementation plan will address several areas where immediate compliance action is required. It will identify all current uses of ODSs and inventories, document the remaining useful life of equipment that contains ODS chemicals, provide a phase-out schedule, and provide a strategy that will be implemented consistently by all the Hanford Site contractors. This plan also addresses the critical and required elements of Federal regulations, the EO, and US Department of Energy (DOE) guidance. This plan is intended to establish a sitewide management system to address the clean air requirements.

Nickels, J.M.; Brown, M.J.

1994-07-01T23:59:59.000Z

393

INFLUENCE OF ELEVATED OZONE AND CARBON DIOXIDE ON INSECT DENSITIES.  

SciTech Connect (OSTI)

The combustion of fossil fuels is profoundly altering the chemical composition of the atmosphere. Beginning with the Industrial Revolution, the concentration of carbon dioxide in the atmosphere has increased from approximately 280 to 370 {micro}l l{sup -1} in 2004, and it is expected to exceed 550 {micro}l l{sup -1} by 2050. Tropospheric ozone has risen even more rapidly than CO{sub 2} and average summer concentrations in the Northern Hemisphere are expected to continue to increase by 0.5-2.5% per year over the next 30 years. Although elevated CO{sub 2} stimulates photosynthesis and productivity of terrestrial ecosystems, ozone (O{sub 3}) is deleterious. In addition to directly affecting the physiology and productivity of crops, increased concentrations of tropospheric CO{sub 2} and O{sub 3} are predicted to lower the nutritional quality of leaves, which has the potential to increase herbivory as insects eat more to meet their nutritional demands. We tested the hypothesis that changes in tropospheric chemistry affect the relationship between plants and insect herbivores by changing leaf quality. The susceptibility to herbivory of soybean grown in elevated CO{sub 2} or O{sub 3} was examined using free air gas concentration enrichment (SoyFACE). FACE technology has the advantage that plants are cultivated under realistic field conditions with no unwanted alteration of microclimate or artificial constraints on the insect community.

DELUCIA, E.; DERMODY, O.; O'NEILL, B.; ALDEA, M.; HAMILTON, J.; ZANGERL, A.; ROGER, A.; BERENBAUM, M.

2005-01-05T23:59:59.000Z

394

THE IMPACT OF OZONE ON THE LOWER FLAMMABLE LIMIT OF HYDROGEN IN VESSELS CONTAINING SAVANNAH RIVER SITE HIGH LEVEL WASTE  

SciTech Connect (OSTI)

The Savannah River Site, in conjunction with AREVA Federal services, has designed a process to treat dissolved radioactive waste solids with ozone. It is known that in this radioactive waste process, radionuclides radiolytically break down water into gaseous hydrogen and oxygen, which presents a well defined flammability hazard. Flammability limits have been established for both ozone and hydrogen separately; however, there is little information on mixtures of hydrogen and ozone. Therefore, testing was designed to provide critical flammability information necessary to support safety related considerations for the development of ozone treatment and potential scale-up to the commercial level. Since information was lacking on flammability issues at low levels of hydrogen and ozone, a testing program was developed to focus on filling this portion of the information gap. A 2-L vessel was used to conduct flammability tests at atmospheric pressure and temperature using a fuse wire ignition source at 1 percent ozone intervals spanning from no ozone to the Lower Flammable Limit (LFL) of ozone in the vessel, determined as 8.4%(v/v) ozone. An ozone generator and ozone detector were used to generate and measure the ozone concentration within the vessel in situ, since ozone decomposes rapidly on standing. The lower flammability limit of hydrogen in an ozone-oxygen mixture was found to decrease from the LFL of hydrogen in air, determined as 4.2 % (v/v) in this vessel. From the results of this testing, Savannah River was able to develop safety procedures and operating parameters to effectively minimize the formation of a flammable atmosphere.

Sherburne, Carol [Savannah River Site (SRS), Aiken, SC (United States). Savannah River Remediation, LLC; Osterberg, Paul [Fauske and Associates, LLC, Burr Ridge, IL (United States); Johnson, Tom [Fauske and Associates, LLC, Burr Ridge, IL (United States); Frawely, Thomas [Fauske and Associates, LLC, Burr Ridge, IL (United States)

2013-01-23T23:59:59.000Z

395

Surface modification of nitrogen-doped carbon nanotubes by ozone via atomic layer deposition  

SciTech Connect (OSTI)

The use of ozone as an oxidizing agent for atomic layer deposition (ALD) processes is rapidly growing due to its strong oxidizing capabilities. However, the effect of ozone on nanostructured substrates such as nitrogen-doped multiwalled carbon nanotubes (NCNTs) and pristine multiwalled carbon nanotubes (PCNTs) are not very well understood and may provide an avenue toward functionalizing the carbon nanotube surface prior to deposition. The effects of ALD ozone treatment on NCNTs and PCNTs using 10?wt. % ozone at temperatures of 150, 250, and 300?°C are studied. The effect of ozone pulse time and ALD cycle number on NCNTs and PCNTs was also investigated. Morphological changes to the substrate were observed by scanning electron microscopy and high resolution transmission electron microscopy. Brunauer-Emmett-Teller measurements were also conducted to determine surface area, pore size, and pore size distribution following ozone treatment. The graphitic nature of both NCNTs and PCNTs was determined using Raman analysis while x-ray photoelectron spectroscopy (XPS) was employed to probe the chemical nature of NCNTs. It was found that O{sub 3} attack occurs preferentially to the outermost geometric surface of NCNTs. Our research also revealed that the deleterious effects of ozone are found only on NCNTs while little or no damage occurs on PCNTs. Furthermore, XPS analysis indicated that ALD ozone treatment on NCNTs, at elevated temperatures, results in loss of nitrogen content. Our studies demonstrate that ALD ozone treatment is an effective avenue toward creating low nitrogen content, defect rich substrates for use in electrochemical applications and ALD of various metal/metal oxides.

Lushington, Andrew; Liu, Jian; Tang, Yongji; Li, Ruying; Sun, Xueliang, E-mail: xsun@eng.uwo.ca [Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario N6A 5B9 (Canada)

2014-01-15T23:59:59.000Z

396

Management of the seasonally anestrous mare  

E-Print Network [OSTI]

21st Convention, 245. Evans, N. J. and C. H. G. Irvine. 1975. Serum concentrations of FSH, LH and progesterone during the oestrous cycle and early pregnancy in the mare. J, Reprod. Fert. , Suppl. 23:193. Freedman, L. J. , N. C. Garcia, and 0. J... of season and nursing. Am. J. Vet. Res. 33:1935. Irvine, C. H. G. 1981. Endocrinology of the estrous cycle of the mare: applications of embryo transfer. Theriogenology 15:85. Nishikawa, Y. 1959. Studies on reproduction in horses. Jap. Racing Assn. Tokyo...

Fisher, Buddy B.

2012-06-07T23:59:59.000Z

397

Four Seasons Windpower, LLC | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartmentAUDIT REPORTOpen EnergyBoard" form. To create a page with thisFortunySeasons

398

Development of a Web-Based, Code-Compliant 2001 IECC Residential Simulator for Texas  

E-Print Network [OSTI]

are then further processed by the routine that uses eGRID to calculate the annual and Ozone Season Day (OSD) NOx emissions reduction number in lbs of NOx for the power plant that supplied the electricity use to the county in which the house was built. SYSTEMS... custom weighting factors). The current mode uses the thermal mass construction for the current version. - 852 - ESL-PA-09-07-01 2009 Building Simulation Conference, International Building Performance Simulation Association (IBPSA), July 27-30th...

Haberl, J.; Culp, C.; Yazdani, B.

399

Oxidation of methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) by ozone and combined ozone/hydrogen peroxide  

SciTech Connect (OSTI)

The aim of this work was to study the reaction of ozone and combined ozone/hydrogen peroxide on oxygenated additives such as methyl tert-butyl ether (MTBE) and ethyl tert-butyl ether (ETBE) in dilute aqueous solution using controlled experimental conditions. Experiments conducted in a semi-continuous reactor with MTBE and ETBE in combination (initial concentration: 2 mmol/L of each) showed that ETBE was better eliminated than MTBE with both ozone and combined O[sub 3]/H[sub 2]O[sub 2]. batch experiments led to the determination of the ratio of the kinetic constants for the reaction of OH[degree]-radical with MTBE and ETBE (k[sub OH[degree]/ETBE]/k[sub OH[degree]//MTBE] = 1.7). Tert-butyl formate and tert-butyl acetate were identified as the ozonation byproducts of MTBE an ETBE, respectively, while tert-butyl alcohol was found to be produced during the ozonation of both compounds. 10 refs., 10 figs., 1 tab.

Leitner, N.K.V.; Papailhou, A.L.; Croue, J.P.; Dore, M. (Univ. de Poitiers (France)); Peyrot, J. (British Petroleum, Harfleur (France))

1994-01-01T23:59:59.000Z

400

Scale-Up and Demonstration of Fly Ash Ozonation Technology  

SciTech Connect (OSTI)

This is the fourth quarterly report under DOE Cooperative Agreement No.: DE-FC26-03NT41730. Due a number of circumstances, mostly associated with subcontractor agreements, the actual beginning of the project was delayed from its original award date of March 5, 2003. DOE's Project Manager was kept informed (verbally) by PPL's Project Manager throughout this period. Because of this delay, this is the fourth quarterly report and it refers to the time period from January to March 2004. The on-site deployment and testing of the ozonation system took place during this period. This report summarizes these activities including some preliminary results. No significant issues or concerns are identified.

Larry LaBuz; Rui Afonso

2005-03-31T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Three-dimensional simulations of wintertime ozone variability in the lower stratosphere  

SciTech Connect (OSTI)

The evolution of ozone has been calculated for the winters of 1979 and 1989 using winds derived from the authors stratospheric data assimilation system (STRATAN). The ozone fields calculated using this technique are found to compare well with satellite-measured fields for simulations of 2-3 months. Here the authors present comparisons of model fields with both satellite and sonde measurements to verify that stratospheric transport processes are properly represented by this modeling technique. Attention is focussed on the northern hemisphere middle and high latitudes at the 10-hPa level and below, where transport processes are most important to the ozone distribution. First-order quantities and derived budgets from both the model and satellite data are presented. By sampling the model with a limb-viewing satellite and then Kalman filtering the observations of the model, it is shown that transient subplanetary-scale features that are essential to the ozone budget are missed by the satellite system.

Rood, R.B.; Douglass, A.R.; Kaye, J.A. (NASA Goddard Space Flight Center, Greenbelt, MD (USA)); Geller, M.A.; Yuechen, Chi (State Univ. of New York, Stony Brook (USA)); Allen, D.J.; Larson, E.M.; Nash, E.R.; Nielsen, J.E. (Applied Research Corp., Landover, MD (USA))

1991-03-20T23:59:59.000Z

402

Climatology and Trends in the Forcing of the Stratospheric Ozone Transport  

E-Print Network [OSTI]

A thorough analysis of the ozone transport was carried out using the Transformed-Mean Eulerian (TEM) tracer transport equation and the European Centre for Medium-Range Weather Forecasts (ECMWF) Re- Analysis (ERA-40). In ...

Monier, Erwan

403

A Spatial Econometric Approach to Measuring Pollution Externalities: An Application to Ozone Smog  

E-Print Network [OSTI]

A Spatial Econometric Approach to Measuring Pollution Externalities: An Application to Ozone Smog C.-Y. Cynthia Lin University of California at Davis ­ USA Abstract. This paper uses spatial econometrics

Lin, C.-Y. Cynthia

404

Evaluation of a novel ozone generation technique for disinfection of poultry hatchers and processed broiler carcasses  

E-Print Network [OSTI]

When comparing electrochemically generated ozone(03)(2.94.2 wt % inside the (hatcher) and formaldehyde (16 n-A formalin + 7.5 g potassium pertnanganate) for disinfection of Salmonella enteiltidis (SE) contaminated agar plates and typical hatchery...

Ramirez, Gerardo Arturo

1994-01-01T23:59:59.000Z

405

Climatology and trends in the forcing of the stratospheric ozone transport  

E-Print Network [OSTI]

A thorough analysis of the ozone transport was carried out using the Transformed-Mean Eulerian (TEM) tracer continuity equation and the European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40). In ...

Monier, Erwan

406

Ozone response to emission changes: a modeling study during the MCMA-2006/MILAGRO Campaign  

E-Print Network [OSTI]

The sensitivity of ozone production to precursor emissions was investigated under five different meteorological conditions in the Mexico City Metropolitan Area (MCMA) during the MCMA-2006/MILAGRO field campaign using the ...

Song, Jihee

407

Real-World Studies of Ambient Ozone Formation as a Function of...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

-- Washington D.C. ace29lawson.pdf More Documents & Publications Weekday and Weekend Air Pollutant Levels in Ozone Problem Areas in the U.S. Health Impacts Program DOE's...

408

Ozone predictabilities due to meteorological uncertainties in the Mexico City basin using ensemble forecasts  

E-Print Network [OSTI]

The purpose of the present study is to investigate the sensitivity of ozone (O3)[(O subscript 3)] predictions in the Mexico City Metropolitan Area (MCMA) to meteorological initial uncertainties and planetary boundary layer ...

Bei, Naifang

409

Bering Sea Chinook Salmon Seasonal Bycatch Report (includes CDQ)  

E-Print Network [OSTI]

101 IPA Season Total Catch Allocation Remaining Allocation % Taken Last Week Catch A 2,153 6,748 4,595 32% 0 B 5 4,024 4,019 0% 5 Total 2,158 10,772 8,614 20% 5 BS Chinook Salmon AFA COOP 102 IPA Season 0 0% 0 BS Chinook Salmon AFA COOP 103 IPA Season Total Catch Allocation Remaining Allocation % Taken

410

Bering Sea Chinook Salmon Seasonal Bycatch Report (includes CDQ)  

E-Print Network [OSTI]

101 IPA Season Total Catch Allocation Remaining Allocation % Taken Last Week Catch A 0 6,748 6,748 0% 0 B 0 4,024 4,024 0% 0 Total 0 10,772 10,772 0% 0 BS Chinook Salmon AFA COOP 102 IPA Season Total BS Chinook Salmon AFA COOP 103 IPA Season Total Catch Allocation Remaining Allocation % Taken Last

411

JV Task 117 - Impact of Lignite Properties on Powerspan's NOx Oxidation System  

SciTech Connect (OSTI)

Powerspan's multipollutant control process called electrocatalytic oxidation (ECO) technology is designed to simultaneously remove SO{sub 2}, NO{sub x}, PM{sub 2.5}, acid gases (such as hydrogen fluoride [HF], hydrochloric acid [HCl], and sulfur trioxide [SO{sub 3}]), Hg, and other metals from the flue gas of coal-fired power plants. The core of this technology is a dielectric barrier discharge reactor composed of cylindrical quartz electrodes residing in metal tubes. Electrical discharge through the flue gas, passing between the electrode and the tube, produces reactive O and OH radicals. The O and OH radicals react with flue gas components to oxidize NO to NO{sub 2} and HNO{sub 3} and a small portion of the SO{sub 2} to SO{sub 3} and H{sub 2}SO{sub 4}. The oxidized compounds are subsequently removed in a downstream scrubber and wet electrostatic precipitator. A challenging characteristic of selected North Dakota lignites is their high sodium content. During high-sodium lignite combustion and gas cooling, the sodium vaporizes and condenses to produce sodium- and sulfur-rich aerosols. Based on past work, it was hypothesized that the sodium aerosols would deposit on and react with the silica electrodes and react with the silica electrodes, resulting in the formation of sodium silicate. The deposit and reacted surface layer would then electrically alter the electrode, thus impacting its dielectric properties and NO{sub x} conversion capability. The purpose of this project was to determine the impact of lignite-derived flue gas containing sodium aerosols on Powerspan's dielectric barrier discharge (DBD) reactor with specific focus on the interaction with the quartz electrodes. Partners in the project were Minnkota Power Cooperative; Basin Electric Power Cooperative; Montana Dakota Utilities Co.; Minnesota Power; the North Dakota Industrial Commission, the Lignite Energy Council, and the Lignite Research Council; the Energy & Environmental Research Center (EERC); and the U.S. Department of Energy. An electrocatalytic oxidation (ECO) reactor slipstream system was designed by Powerspan and the EERC. The slipstream system was installed by the EERC at Minnkota Power Cooperative's Milton R. Young Station Unit 1 downstream of the electrostatic precipitator where the flue gas temperature ranged from 300 to 350 F. The system was commissioned on July 3, 2007, operated for 107 days, and then winterized upon completion of the testing campaign. Operational performance of the system was monitored, and data were archived for postprocessing. A pair of electrodes were extracted and replaced on a biweekly basis. Each pair of electrodes was shipped to Powerspan to determine NO conversion efficiency in Powerspan's laboratory reactor. Tested electrodes were then shipped to the EERC for scanning electron microscopy (SEM) and x-ray microanalysis. Measurement of NO{sub x} conversion online in operating the slipstream system was not possible because the nitric and sulfuric acid production by the DBD reactor results in conditioning corrosion challenges in the sample extraction system and NO measurement technologies. The operational observations, performance results, and lab testing showed that the system was adversely affected by accumulation of the aerosol materials on the electrode. NO{sub x} conversion by ash-covered electrodes was significantly reduced; however, with electrodes that were rinsed with water, the NOx conversion efficiency recovered to nearly that of a new electrode. In addition, the visual appearance of the electrode after washing did not show evidence of a cloudy reacted surface but appeared similar to an unexposed electrode. Examination of the electrodes using SEM x-ray microanalysis showed significant elemental sodium, sulfur, calcium, potassium, and silica in the ash coating the electrodes. There was no evidence of the reaction of the sodium with the silica electrodes to produce sodium silicate layers. All SEM images showed a clearly marked boundary between the ash and the silica. Sodium and sulfur are the main culprits in the

Scott Tolbert; Steven Benson

2008-02-29T23:59:59.000Z

412

Formation of ozone and oxidation of methane in a direct current corona discharge  

E-Print Network [OSTI]

FORMATION OF OZONE AND OXIDATION OF METHANE IN A DIRECT CURRENT CORONA DISCHARGE A Thesis by UMASHANKER TANGIRALA Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE May 1976 Major Subject: Chemical Engineering FORMATION OF OZONE AND OXIDATION OF METHANE IN A DIRECT CURRENT CORONA DISCHARGE A Thesis by UMASHANKER TANGIRALA Approved as to style and content by: (Chairman of Committee) ( ad of Department...

Tangirala, Umashanker

1976-01-01T23:59:59.000Z

413

NOx enhancements in the middle atmosphere during 2003-2004 polar winter: The relative significance of Solar Proton Events and the Aurora as a source.  

E-Print Network [OSTI]

contributions of ionization due to solar proton events, energetic electron precipitation, and low energy (1 energy electron precipitation as LEE-NOx. Note also that energy spectra caused by solar wind and CME significance of Solar Proton Events and the Aurora as a source. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Otago, University of

414

Near-Zero Emissions Oxy-Combustion Flue Gas Purification Task 2: SOx/Nox/Hg Removal for High Sulfur Coal  

SciTech Connect (OSTI)

The goal of this project is to develop a near-zero emissions flue gas purification technology for existing PC (pulverized coal) power plants that are retrofitted with oxy-combustion technology. The objective of Task 2 of this project was to evaluate an alternative method of SOx, NOx and Hg removal from flue gas produced by burning high sulfur coal in oxy-combustion power plants. The goal of the program was not only to investigate a new method of flue gas purification but also to produce useful acid byproduct streams as an alternative to using a traditional FGD and SCR for flue gas processing. During the project two main constraints were identified that limit the ability of the process to achieve project goals. 1) Due to boiler island corrosion issues >60% of the sulfur must be removed in the boiler island with the use of an FGD. 2) A suitable method could not be found to remove NOx from the concentrated sulfuric acid product, which limits sale-ability of the acid, as well as the NOx removal efficiency of the process. Given the complexity and safety issues inherent in the cycle it is concluded that the acid product would not be directly saleable and, in this case, other flue gas purification schemes are better suited for SOx/NOx/Hg control when burning high sulfur coal, e.g. this project's Task 3 process or a traditional FGD and SCR.

Nick Degenstein; Minish Shah; Doughlas Louie

2012-05-01T23:59:59.000Z

415

Nox2 redox signaling maintains essential cell populations in the Bryan C Dickinson1, Joseph Peltier2, Daniel Stone2, David V Schaffer2, and Christopher J  

E-Print Network [OSTI]

Nox2 redox signaling maintains essential cell populations in the brain Bryan C Dickinson1, Joseph Peltier2, Daniel Stone2, David V Schaffer2, and Christopher J Chang1,3 1Department of Chemistry indicator for hydrogen peroxide (H2O2), we show that adult hippocampal stem/progenitor cells (AHPs) generate

Schaffer, David V.

416

abundance seasonal dynamics: Topics by E-print Network  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: -seasonal climate variability: simulation and prediction using POAMA-2 Andrew Marshall Debbie Hudson, Matthew management Can POAMA help fill the gap? 12;Background...

417

Ozone response of foliage and cells of sensitive and tolerant potato cultivars  

SciTech Connect (OSTI)

The ozone response was contrasted between Cherokee' and Norchip', relatively ozone-sensitive and -tolerant potato cultivars, respectively. Leaf conductance of the two cultivars was determined with a diffusive resistance porometer before, during and after a 3-hour exposure to 0.25 ppm ozone (490 ..mu..g m3). While Cherokee foliage had a higher leaf conductance at the onset of the ozone exposure, conductance of Norchip foliage was too high throughout the experiment to account for relative tolerance of the latter cultivar. Norchip and Cherokee both exhibited abaxial and bifacial necrosis with more numerous lesions on the abaxial surface. Abaxial and bifacial necrosis were characterized by injured spongy, and spongy plus palisade cells, respectively. The percent of injured cell types were the same in both cultivars, but the absolute number of cells injured was greater in Cherokee than Norchip. Two types of cell injury were observed in necrotic lesions. One type of injury was characterized by collapsed, basophilic cells and the other by intact, basophilic cells. The ozone response of isolated leaf protoplasts of the two cultivars was similar. Two types of protoplast injury were observed, one characterized by lysis and the other by reduced staining with fluorescein diacetate. Maximum protoplast response to ozone was observed within the first 5 minutes of a 15 minute exposure. Little additional protoplast response occurred after 10 minutes.

Illman, B.L.

1983-01-01T23:59:59.000Z

418

Evaluation of stratospheric NO2 retrieved from the Ozone Monitoring Instrument: Intercomparison, diurnal cycle,  

E-Print Network [OSTI]

[Intergovernmental Panel on Climate Change, 2007], influence the oxidizing capacity of the troposphere, and affect on the tem- poral behavior of NOx emissions. [3] Satellite remote sensing is used for measuring strato since the 1980s, e.g., SME (Solar Mesosphere Explorer) [Mount et al., 1984], which first used the DOAS

Boersma, Folkert

419

Firing microfine coal with a low NOx, RSFC burner in an industrial boiler designed for oil and gas  

SciTech Connect (OSTI)

ABB Power Plant Laboratories (ABB-PPL) working under a US Department of Energy-Pittsburgh Energy Technology Center (DOE-PETC) contract has carried out tests with the Radially Stratified Flame Core (RSFC) burner which was licensed from the Massachusetts Institute of Technology who developed and patented the RSFC burner. Tests were carried out in a small industrial boiler, designed for oil and natural gas, located at the Energy and Fuels Research Center of Penn State University who was working as a subcontractor to ABB-PPL. The paper presents results from the long-term testing task in the DOE-PETC program with particular attention being paid to the challenges faced in maintaining high combustion efficiencies while achieving low NOx in a small industrial boiler designed for firing oil or natural gas. The paper will also address the issue of ash management when firing coal in a boiler designed for fuels having essentially no ash.

Thornhock, D.E.; Patel, R.; Borio, R.W. [Combustion Engineering, Inc., Windsor, CT (United States). ABB Power Plant Labs.; Miller, B.G.; Scaroni, A.W. [Pennsylvania State Univ., University Park, PA (United States). Energy and Fuels Research Center

1996-12-31T23:59:59.000Z

420

Optimization of stabilized leachate treatment using ozone/persulfate in the advanced oxidation process  

SciTech Connect (OSTI)

Highlights: ? Ozone and persulfate reagent (O{sub 3}/S{sub 2}O{sub 8}{sup 2-}) was used to treat stabilized leachate. ? Central composite design (CCD) with response surface methodology (RSM) was applied. ? Operating variables including ozone and persulfate dosage, pH variance, and reaction time. ? Optimum removal of COD, color, and NH{sub 3}–N was 72%, 96%, and 76%, respectively. ? A good value of ozone consumption (OC) obtained with 0.60 (kg O{sub 3}/kg COD). - Abstract: The objective of this study was to investigate the performance of employing persulfate reagent in the advanced oxidation of ozone to treat stabilized landfill leachate in an ozone reactor. A central composite design (CCD) with response surface methodology (RSM) was applied to evaluate the relationships between operating variables, such as ozone and persulfate dosages, pH, and reaction time, to identify the optimum operating conditions. Quadratic models for the following four responses proved to be significant with very low probabilities (<0.0001): COD, color, NH{sub 3}–N, and ozone consumption (OC). The obtained optimum conditions included a reaction time of 210 min, 30 g/m{sup 3} ozone, 1 g/1 g COD{sub 0}/S{sub 2}O{sub 8}{sup 2-} ratio, and pH 10. The experimental results were corresponded well with predicted models (COD, color, and NH{sub 3}–N removal rates of 72%, 96%, and 76%, respectively, and 0.60 (kg O{sub 3}/kg COD OC). The results obtained in the stabilized leachate treatment were compared with those from other treatment processes, such as ozone only and persulfate S{sub 2}O{sub 8}{sup 2-} only, to evaluate its effectiveness. The combined method (i.e., O{sub 3}/S{sub 2}O{sub 8}{sup 2-}) achieved higher removal efficiencies for COD, color, and NH{sub 3}–N compared with other studied applications. Furthermore, the new method is more efficient than ozone/Fenton in advanced oxidation process in the treatment of the same studied leachate.

Abu Amr, Salem S. [School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang (Malaysia); Aziz, Hamidi Abdul, E-mail: cehamidi@eng.usm.my [School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang (Malaysia); Adlan, Mohd Nordin [School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang (Malaysia)

2013-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

CAREL connectivity solutions ,,Improvement of the seasonal COP of  

E-Print Network [OSTI]

efficiency Seasonal efficiencySeasonal efficiency ·Full load rating Partial load ratingPartial load rating match the partial load giving an extremely high unit efficiency due to... ...the improved efficiency of the compressor at partial load as motor performance and basic COP... ... together with improved efficiency

Oak Ridge National Laboratory

422

Business surveys modelling with Seasonal-Cyclical Long Memory models  

E-Print Network [OSTI]

Business surveys modelling with Seasonal-Cyclical Long Memory models Ferrara L. and Guégan D. 2nd business surveys released by the European Commission. We introduce an innovative way for modelling those linear models. Keywords: Euro area, nowcasting, business surveys, seasonal, long memory. JEL

Paris-Sud XI, Université de

423

Seasonal mass balance gradients in Norway L. A. Rasmussen1  

E-Print Network [OSTI]

16 Aug 05 Seasonal mass balance gradients in Norway L. A. Rasmussen1 and L. M. Andreassen2 1 Norwegian Water Resources and Energy Directorate (NVE) P. O. Box 5091 Majorstua, N-0301 Oslo, Norway in Norway exists in their profiles of both seasonal balances, winter bw(z) and summer bs(z). Unlike many

Rasmussen, L.A.

424

Seasonal patterns in energy partitioning of two freshwater marsh ecosystems  

E-Print Network [OSTI]

). The study period included several wet and dry seasons and variable water levels, allowing us to gain better and affect the magnitude of seasonal change in water levels through water loss as LE (evapotranspiration (ET that produce considerable variation in the hydrologic cycle, affecting nutrient delivery, ecosystem primary

425

The 2002 North Atlantic Hurricane Season Gerald D. Bell1  

E-Print Network [OSTI]

. 2000). One measure of this seasonal activity is the Accumulated Cyclone Energy (ACE) index (Fig. 1), which is essentially a wind energy index calculated by summing the squares of the estimated 6-hourly storm or hurricane. For the 2002 season the total ACE index was 62.5 x 105 kt2 (Fig. 1), or 73

426

SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY AND RESPONSES TO GLOBAL  

E-Print Network [OSTI]

SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY AND RESPONSES TO GLOBAL WARMING Mxolisi Excellent Shongwe #12;ISBN : 978-90-902-5046-5 #12;SEASONAL CLIMATE EXTREMES: MECHANISMS, PREDICTABILITY;. . . Dedicated to my late father John Mabhensa Shongwe #12;ABSTRACT Climate extremes are rarely occurring natural

Haak, Hein

427

Overview of ozone human exposure and health risk analyses used in the U.S. EPA's review of the ozone air quality standard.  

SciTech Connect (OSTI)

This paper presents an overview of the ozone human exposure and health risk analyses developed under sponsorship of the U.S. Environmental Protection Agency (EPA). These analyses are being used in the current review of the national ambient air quality standards (NAAQS) for ozone. The analyses consist of three principal steps: (1) estimating short-term ozone exposure for particular populations (exposure model); (2) estimating population response to exposures or concentrations (exposure-response or concentration-response models); and (3) integrating concentrations or exposure with concentration-response or exposure-response models to produce overall risk estimates (risk model). The exposure model, called the probabilistic NAAQS exposure model for ozone (pNEM/03), incorporates the following factors: hourly ambient ozone concentrations; spatial distribution of concentrations; ventilation state of individuals at time of exposure; and movement of people through various microenvironments (e.g., outdoors, indoors, inside a vehicle) of varying air quality. Exposure estimates are represented by probability distributions. Exposure-response relationships have been developed for several respiratory symptom and lung function health effects, based on the results of controlled human exposure studies. These relationships also are probabilistic and reflect uncertainties associated with sample size and variability of response among subjects. The analyses also provide estimates of excess hospital admissions in the New York City area based on results from an epidemiology study. Overall risk results for selected health endpoints and recently analyzed air quality scenarios associated with alternative 8-hour NAAQS and the current 1-hour standard for outdoor children are used to illustrate application of the methodology.

Whitfield, R. G.

1999-03-04T23:59:59.000Z

428

Fading of alizarin and related artists's pigments by atmospheric ozone: reaction products and mechanisms  

SciTech Connect (OSTI)

The colorants alizarin and Alizarin Crimson (a calcium-aluminum lake pigment) and their simple structural homologue anthraquinone were deposited on silica gel, cellulose, and Teflon substrates and exposed in the dark to ozone in purified air (approx.0.4 ppm O/sub 3/ for 95 days and approx.10 ppm O/sub 3/ for 18-80 h). Exposed and control samples were analyzed by mass spectrometry. Alizarin Crimson reacted with ozone on all substrates, yielding phthalic acid (major), benzoic acid (minor), and other minor and unidentified products. Anthraquinone did not react with ozone irrespective of conditions. Alizarin did not react on Teflon or cellulose but reacted on silica gel to yield phthalic acid (major) and other products. A chemical mechanism responsible for the fading of these alizarin-related colorants by ozone is suggested that is consistent with the products distribution, the observed reactivity sequence, and the observed substrate-specific effects. The possible application of this work to predicting the ozone fastness of other alizarin-related pigments is discussed briefly. 33 references, 5 figures.

Grosjean, D.; Whitmore, P.M.; De Moor, C.P.; Cass, G.R.; Druzik, J.R.

1987-07-01T23:59:59.000Z

429

NOVEL DATA ANALYSIS TECHNIQUE TO EVALUATE FIELD NOx AND CO2 CONTINUOUS EMISSION DATA, BASED ON THE EVALUATION OF: (1) AN OFF-ROAD DIESEL COMPACTOR RUNNING ON THREE FUEL TYPES AND (2) TWO COMPACTORS RUNNING ON DIESEL FUEL  

E-Print Network [OSTI]

In spite of being few in number, off-road vehicles have a significant contribution to air pollutants such as NOx and CO2. Engine dynamometer test cycles have been developed in an effort to better characterize the emissions ...

Guerra, Sergio

2012-12-31T23:59:59.000Z

430

Insights into the historical construction of species-rich Mesoamerican seasonally dry tropical forests: the diversification  

E-Print Network [OSTI]

Insights into the historical construction of species-rich Mesoamerican seasonally dry tropical, Mesoamerica, niche conservatism, seasonally dry tropical forests. Summary · Mesoamerican arid biomes epitomize the vast species richness of Meso- american seasonally dry tropical forests (SDTFs), and to evaluate

Olson, Mark

431

18 Journal of Student Research in Environmental Science at Appalachian Diurnal and seasonal characteristics  

E-Print Network [OSTI]

they tend to be removed in the upper respiratory system [1]. PM2.5 ­ particles less than 2.5 micrometers-level ozone adversely affects health (e.g. acute respiratory problems and immune system impairment over rural areas like GSMNP. One of the possible mechanisms for long range transport of ozone from

Thaxton, Christopher S.

432

Sensitivity of China's ozone air quality to 2000-2050 global changes of1 climate and emissions2  

E-Print Network [OSTI]

1 Sensitivity of China's ozone air quality to 2000-2050 global changes of1 climate and emissions2 3 emissions of ozone precursors. The climate and16 emission effect in combination will increase afternoon mean increases18 in global (excluding China) anthropogenic emissions, 37% to Chinese emission19 increases

Wu, Shiliang

433

A numerical study of mass transfer of ozone dissolution in bubble plumes with an Euler-Lagrange Method  

E-Print Network [OSTI]

, as a model problem for a water purification system. The effect of bubble diameter and plume structure on mass are widely observed and exploited in engineering applications, with water purification using ozone bubble the mass transfer process of ozone dissolution in a bubble plume inside a rectangular water tank

Huang, Huaxiong

434

Impact of ozone on indoor air quality: a preliminary field study M. Nicolas, O. Ramalho, F. Maupetit  

E-Print Network [OSTI]

indoor air quality (IAQ) since they produce secondary pollutants, mainly aldehydes which are known to document the impact on IAQ of outdoor ozone during summer air pollution episodes. For this purpose, a oneImpact of ozone on indoor air quality: a preliminary field study M. Nicolas, O. Ramalho, F

Boyer, Edmond

435

The sensitivity of modeled ozone to the temporal distribution of point, area, and mobile source emissions in the eastern United States  

E-Print Network [OSTI]

the emissions of NOx from day to night, for example in electric powered vehicles recharged at night, could have vehicles to the fleet (Bloomer et al., 2009) many regulators are focusing on reducing emissions at peak a memorandum of under- standing to reduce NOx emissions from peaking units on high electrical demand days (HEDD

Stehr, Jeffrey

436

Near-Zero Emissions Oxy-Combustion Flue Gas Purification Task 3: SOx/NOx/Hg Removal for Low Sulfur Coal  

SciTech Connect (OSTI)

The goal of this project was to develop a near-zero emissions flue gas purification technology for existing PC (pulverized coal) power plants that are retrofitted with oxycombustion technology. The objective of Task 3 of this project was to evaluate an alternative method of SOx, NOx and Hg removal from flue gas produced by burning low sulfur coal in oxy-combustion power plants. The goal of the program was to conduct an experimental investigation and to develop a novel process for simultaneously removal of SOx and NOx from power plants that would operate on low sulfur coal without the need for wet-FGD & SCRs. A novel purification process operating at high pressures and ambient temperatures was developed. Activated carbonâ??s catalytic and adsorbent capabilities are used to oxidize the sulfur and nitrous oxides to SO{sub 3} and NO{sub 2} species, which are adsorbed on the activated carbon and removed from the gas phase. Activated carbon is regenerated by water wash followed by drying. The development effort commenced with the screening of commercially available activated carbon materials for their capability to remove SO{sub 2}. A bench-unit operating in batch mode was constructed to conduct an experimental investigation of simultaneous SOx and NOx removal from a simulated oxyfuel flue gas mixture. Optimal operating conditions and the capacity of the activated carbon to remove the contaminants were identified. The process was able to achieve simultaneous SOx and NOx removal in a single step. The removal efficiencies were >99.9% for SOx and >98% for NOx. In the longevity tests performed on a batch unit, the retention capacity could be maintained at high level over 20 cycles. This process was able to effectively remove up to 4000 ppm SOx from the simulated feeds corresponding to oxyfuel flue gas from high sulfur coal plants. A dual bed continuous unit with five times the capacity of the batch unit was constructed to test continuous operation and longevity. Full-automation was implemented to enable continuous operation (24/7) with minimum operator supervision. Continuous run was carried out for 40 days. Very high SOx (>99.9%) and NOx (98%) removal efficiencies were also achieved in a continuous unit. However, the retention capacity of carbon beds for SOx and NOx was decreased from ~20 hours to ~10 hours over a 40 day period of operation, which was in contrast to the results obtained in a batch unit. These contradictory results indicate the need for optimization of adsorption-regeneration cycle to maintain long term activity of activated carbon material at a higher level and thus minimize the capital cost of the system. In summary, the activated carbon process exceeded performance targets for SOx and NOx removal efficiencies and it was found to be suitable for power plants burning both low and high sulfur coals. More efforts are needed to optimize the system performance.

Monica Zanfir; Rahul Solunke; Minish Shah

2012-06-01T23:59:59.000Z

437

Laboratory measurement of secondary pollutant yields from ozone reaction with HVAC filters.  

SciTech Connect (OSTI)

We used Proton Transfer Reaction - Mass Spectrometry (PTR-MS) and conventional sampling methods to monitor and identify trace level organic pollutants formed in heterogeneous reactions between ozone and HVAC filters in real time. Experiments were carried out using a bench-scale flow tube reactor operating with dry air and humidified air (50% RH), at realistically high ozone concentrations (150 ppbv). We explored different filter media (i.e., fiberglass and cotton/polyester blends) and different particle loadings (i.e., clean filter and filters loaded with particles for 3 months at the Lawrence Berkeley National Laboratory and the Port of Oakland, CA). Detailed emission dynamics of very low levels of certain organic pollutants from filter media upon ozone exposure in the presence of moisture have been obtained and analyzed.

Destaillats, Hugo; Chen, Wenhao; Apte, Michael; Li, Nuan; Spears, Michael; Almosni, Jérémie; Zhang, Jianshun (Jensen); Fisk, William J.

2009-09-09T23:59:59.000Z

438

A Methodology for Calculating Integrated Nox Emissions Reduction from Energy Efficiency and Renewable Energy (EE/RE) Programs Across State Agencies in Texas  

E-Print Network [OSTI]

S D INTEGRATED NOx SAVINGS: Commercial Savings and Projections • Commercial: new construction in office, assembly, education, retail, food, lodging and warehouse construction as defined by Dodge building type, using energy savings from the PNNL... Office (SECO), 2007, available at: http://www.seco.cpa.state.tx.us/ USDOE 2005. Analysis of Texas Code Adoption Analysis: Lighting Requirement, Pacific Northwest National Laboratory (PNNL), U.S.D.O.E., Washington, D.C. 9 Table 1: Final...

Gilman, D.; Yazdani, B.; Haberl, J. S.; Liu, Z.; Mukhopadhyay, J.; Culp, C.; Kim, S.; Baltazar-Cervantes, J. C.; Im, P.

439

Combustion characteristics and NOx emissions of two kinds of swirl burners in a 300-MWe wall-fired pulverized-coal utility boiler  

SciTech Connect (OSTI)

Measurements were performed in a 300-MWe wall-fired pulverized-coal utility boiler. Enhanced ignition-dual register (EI-DR) burners and centrally fuel rich (CFR) swirl coal combustion burners were installed in the bottom row of the furnace during experiments. Local mean concentrations of O{sub 2}, CO, CO{sub 2} and NOx gas species, gas temperatures, and char burnout were determined in the region of the two types of burners. For centrally fuel rich swirl coal combustion burners, local mean CO concentrations, gas temperatures and the temperature gradient are higher and mean concentrations of O{sub 2} and NOx along the jet flow direction in the burner region are lower than for the enhanced ignition-dual register burners. Moreover, the mean O{sub 2} concentration is higher and the gas temperature and mean CO concentration are lower in the side wall region. For centrally fuel rich swirl coal combustion burners in the bottom row, the combustion efficiency of the boiler increases from 96.73% to 97.09%, and NOx emission decreases from 411.5 to 355 ppm at 6% O{sub 2} compared to enhanced ignition-dual register burners and the boiler operates stably at 110 MWe without auxiliary fuel oil.

Li, Z.Q.; Jing, J.P.; Chen, Z.C.; Ren, F.; Xu, B.; Wei, H.D.; Ge, Z.H. [Harbin Institute for Technology, Harbin (China). School for Energy Science & Engineering

2008-07-01T23:59:59.000Z

440

New constraints on Northern Hemisphere growing season net flux  

E-Print Network [OSTI]

AL. : LARGER NORTH HEMISPHERE NET ECOSYSTEM EXCHANGE L12807AL. : LARGER NORTH HEMISPHERE NET ECOSYSTEM EXCHANGE Levin,Northern Hemisphere growing season net flux Z. Yang, 1 R. A.

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

EECBG Success Story: South Carolina Community Lights Up the Season...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Holiday Lights EECBG Success Story: South Carolina Community Lights Up the Season with Energy-Efficient Holiday Lights December 20, 2011 - 2:33pm Addthis Carolers sing in front...

442

Thermochemical Kinetics for Multireference Systems: Addition Reactions of Ozone  

SciTech Connect (OSTI)

The 1,3-dipolar cycloadditions of ozone to ethyne and ethene provide extreme examples of multireference singlet-state chemistry, and they are examined here to test the applicability of several approaches to thermochemical kinetics of systems with large static correlation. Four different multireference diagnostics are applied to measure the multireference characters of the reactants, products, and transition states; all diagnostics indicate significant multireference character in the reactant portion of the potential energy surfaces. We make a more complete estimation of the effect of quadruple excitations than was previously available, and we use this with CCSDT/CBS estimation of Wheeler et al. (Wheeler, S. E.; Ess, D. H.; Houk, K. N. J. Phys. Chem. A 2008, 112, 1798.) to make new best estimates of the van der Waals association energy, the barrier height, and the reaction energy to form the cycloadduct for both reactions. Comparing with these best estimates, we present comprehensive mean unsigned errors for a variety of coupled cluster, multilevel, and density functional methods. Several computational aspects of multireference reactions are considered: (i) the applicability of multilevel theory, (ii) the convergence of coupled cluster theory for reaction barrier heights, (iii) the applicability of completely renormalized coupled cluster methods to multireference systems, (iv) the treatment by density functional theory, (v) the multireference perturbation theory for multireference reactions, and (vi) the relative accuracy of scaling-type multilevel methods as compared with additive ones. It is found that scaling-type multilevel methods do not perform better than the additive-type multilevel methods. Among the 48 tested density functionals, only M05 reproduces the best estimates within their uncertainty. Multireference perturbation theory based on the complete-active-space reference wave functions constructed using a small number of reaction-specific active orbitals gives accurate forward barrier heights; however, it significantly underestimates reaction energies.

Zhao, Yan; Tishchenko, Oksana; Gour, Jeffrey R.; Li, Wei; Lutz, Jesse; Piecuch, Piotr; Truhlar, Donald G.

2009-05-14T23:59:59.000Z

443

Bering Sea Chinook Salmon Seasonal Bycatch Report (includes CDQ)  

E-Print Network [OSTI]

values are numbers of fish. Report run on: March 11, 2014 8:28 AM AFA BS Chinook Salmon AFA COOP 101 IPA,771 4,024 1,253 69% 0 Total 4,140 10,772 6,632 38% 0 BS Chinook Salmon AFA COOP 102 IPA Season Total BS Chinook Salmon AFA COOP 103 IPA Season Total Catch Allocation Remaining Allocation % Taken Last

444

Bering Sea Chinook Salmon Seasonal Bycatch Report (includes CDQ)  

E-Print Network [OSTI]

values are numbers of fish. Report run on: March 11, 2014 5:05 AM AFA BS Chinook Salmon AFA COOP 101 IPA,255 4,024 769 81% 0 Total 4,632 10,772 6,140 43% 0 BS Chinook Salmon AFA COOP 102 IPA Season Total Catch Salmon AFA COOP 103 IPA Season Total Catch Allocation Remaining Allocation % Taken Last Week Catch A 609

445

Secondary Pollutants from Ozone Reaction with Ventilation Filters and Degradation of Filter Media Additives  

SciTech Connect (OSTI)

Prior research suggests that chemical processes taking place on the surface of particle filters employed in buildings may lead to the formation of harmful secondary byproducts. We investigated ozone reactions with fiberglass, polyester, cotton/polyester and polyolefin filter media, as well as hydrolysis of filter media additives. Studies were carried out on unused media, and on filters that were installed for 3 months in buildings at two different locations in the San Francisco Bay Area. Specimens from each filter media were exposed to {approx}150 ppbv ozone in a flow tube under a constant flow of dry or humidified air (50percent RH). Ozone breakthrough was recorded for each sample over periods of {approx}1000 min; the ozone uptake rate was calculated for an initial transient period and for steady-state conditions. While ozone uptake was observed in all cases, we did not observe significant differences in the uptake rate and capacity for the various types of filter media tested. Most experiments were performed at an airflow rate of 1.3 L/min (face velocity = 0.013 m/s), and a few tests were also run at higher rates (8 to 10 L/min). Formaldehyde and acetaldehyde, two oxidation byproducts, were quantified downstream of each sample. Those aldehydes (m/z 31 and 45) and other volatile byproducts (m/z 57, 59, 61 and 101) were also detected in real-time using Proton-Transfer Reaction - Mass Spectrometry (PTR-MS). Low-ppbv byproduct emissions were consistently higher under humidified air than under dry conditions, and were higher when the filters were loaded with particles, as compared with unused filters. No significant differences were observed when ozone reacted over various types of filter media. Fiberglass filters heavily coated with impaction oil (tackifier) showed higher formaldehyde emissions than other samples. Those emissions were particularly high in the case of used filters, and were observed even in the absence of ozone, suggesting that hydrolysis of additives, rather than ozonolysis, is the main formaldehyde source in those filters. Emission rates of formaldehyde and acetaldehyde were not found to be large enough to substantially increase indoor concentrations in typical building scenarios. Nevertheless, ozone reactions on HVAC filters cannot be ignored as a source of low levels of indoor irritants.

Destaillats, Hugo; Chen, Wenhao; Apte, Michael; Li, Nuan; Spears, Michael; Almosni, Jérémie; Brunner, Gregory; Zhang, Jianshun (Jensen); Fisk, William J.

2011-05-01T23:59:59.000Z

446

Columbia River Basin Seasonal Volumes and Statistics, 1928-1989. 1990 Level Modified Streamflows Computed Seasonal Volumes 61-Year Statistics.  

SciTech Connect (OSTI)

This report was prepared by the A.G. Crook Company, under contract to Bonneville Power Administration, and provides statistics of seasonal volumes and streamflow for 28 selected sites in the Columbia River Basin.

A.G. Crook Company

1993-04-01T23:59:59.000Z

447

A laboratory study of the seasonal life history and seasonal abundance of the black cutworm, Agrotis ipsilon (Hufnagel  

E-Print Network [OSTI]

. Seasonal History of Agrotis ~l allen (Hufnagel) Development of Artificial Diets for Laboratory Use Laboratory Rearing of ~rotis ~l silon. Head Capsule Measurements . Seasonal Abundance of ~A retie ~i ellen in Texas MATERIALS AND METHODS Establishment.... 40 40 CONCLUSIONS REFERENCES CITED. 50 53 VITA. 57 f Table 1 LIST OF TABLES Ingredients of the artificial diet used for rearing black cutworm larvae Page . 21 Life history of black cutworm moths maintained in the laboratory at College...

Latham, Elwin Eugene

1973-01-01T23:59:59.000Z

448

Study of air pollution: Effects of ozone on neuropeptide-mediated responses in human subjects. Final report  

SciTech Connect (OSTI)

The study examined the hypothesis that ozone inactivates the enzyme, neutral endopeptidase, responsible for limiting the effects of neuropeptides released from afferent nerve endings. Cough response of capsaicin solution delivered from a nebulizer at 2 min. intervals until two or more coughs were produced. Other endpoints measured included irritative symptoms as rated by the subjects on a nonparametric scale, spirometry, of each concentration of ozone were compared to those of filtered air in a single-blind randomized sequence. The results indicate that a 2 h. exposure to 0.4 ppm of ozone with intermittent light exercise alters the sensitivity of airway nerves that mediate the cough response to inhaled materials. This dose of ozone also caused a change in FEV1. A lower level of ozone, 0.02 ppm, caused a change in neither cough threshold nor FEV1, even when the duration of exposure was extended to three hours. The findings are consistent with the author's hypothesis that ozone may sensitize nerve endings in the airways by inactivating neutral endopeptidase, an enzyme that regulates their activity, but they do not demonstrate that directly examining an effect directly mediated by airway nerves allows detection of effects of ozone at doses below those causing effects detected by standard tests of pulmonary function.

Boushey, H.A.

1991-11-01T23:59:59.000Z

449

Indoor Secondary Pollutants from Household Product Emissions inthe Presence of Ozone: A Bench-Scale Chamber Study  

SciTech Connect (OSTI)

Ozone-driven chemistry is a major source of indoor secondary pollutants of health concern. This study investigates secondary air pollutants formed from reactions between constituents of household products and ozone. Gas-phase product emissions were introduced along with ozone at constant rates into a 198-L Teflon-lined reaction chamber. Gas-phase concentrations of reactive terpenoids and oxidation products were measured. Formaldehyde was a predominant oxidation byproduct for the three studied products, with yields under most conditions of 20-30% with respect to ozone consumed. Acetaldehyde, acetone, glycolaldehyde, formic acid and acetic acid were each also detected for two or three of the products. Immediately upon mixing of reactants, a scanning mobility particle sizer detected particle nucleation events that were followed by a significant degree of ultrafine particle growth. The production of secondary gaseous pollutants and particles depended primarily on the ozone level and was influenced by other parameters such as the air-exchange rate. Hydroxyl radical concentrations in the range 0.04-200 x 10{sup 5} molecules cm{sup -3} were measured. OH concentrations were observed to vary strongly with residual ozone level in the chamber, which was in the range 1-25 ppb, as is consistent with expectations from a simplified kinetic model. In a separate test, we exposed the dry residue of two products to ozone in the chamber and observed the formation of gas-phase and particle-phase secondary oxidation products.

Destaillats, Hugo; Lunden, Melissa M.; Singer, Brett C.; Coleman,Beverly K.; Hodgson, Alfred T.; Weschler, Charles J.; Nazaroff, William W.

2005-10-01T23:59:59.000Z

450

Innovative clean coal technology: 500 MW demonstration of advanced wall-fired combustion techniques for the reduction of nitrogen oxide (NOx) emissions from coal-fired boilers. Final report, Phases 1 - 3B  

SciTech Connect (OSTI)

This report presents the results of a U.S. Department of Energy (DOE) Innovative Clean Coal Technology (ICCT) project demonstrating advanced wall-fired combustion techniques for the reduction of nitrogen oxide (NOx) emissions from coal-fired boilers. The project was conducted at Georgia Power Company`s Plant Hammond Unit 4 located near Rome, Georgia. The technologies demonstrated at this site include Foster Wheeler Energy Corporation`s advanced overfire air system and Controlled Flow/Split Flame low NOx burner. The primary objective of the demonstration at Hammond Unit 4 was to determine the long-term effects of commercially available wall-fired low NOx combustion technologies on NOx emissions and boiler performance. Short-term tests of each technology were also performed to provide engineering information about emissions and performance trends. A target of achieving fifty percent NOx reduction using combustion modifications was established for the project. Short-term and long-term baseline testing was conducted in an {open_quotes}as-found{close_quotes} condition from November 1989 through March 1990. Following retrofit of the AOFA system during a four-week outage in spring 1990, the AOFA configuration was tested from August 1990 through March 1991. The FWEC CF/SF low NOx burners were then installed during a seven-week outage starting on March 8, 1991 and continuing to May 5, 1991. Following optimization of the LNBs and ancillary combustion equipment by FWEC personnel, LNB testing commenced during July 1991 and continued until January 1992. Testing in the LNB+AOFA configuration was completed during August 1993. This report provides documentation on the design criteria used in the performance of this project as it pertains to the scope involved with the low NOx burners and advanced overfire systems.

NONE

1998-01-01T23:59:59.000Z

451

Kudzu (Pueraria montana) invasion doubles emissions of nitric oxide and increases ozone pollution  

E-Print Network [OSTI]

Kudzu (Pueraria montana) invasion doubles emissions of nitric oxide and increases ozone pollution) The nitrogen-fixing legume kudzu (Pueraria montana) is a wide- spread invasive plant in the southeastern United the effects of kudzu invasions on soils and trace N gas emissions at three sites in Madison County, Georgia

Mickley, Loretta J.

452

Effects of Ion-Exchange Treatment on Bromate Formation and Oxidation Efficiency during Ozonation  

E-Print Network [OSTI]

water treatment. In this study, we applied several different ion exchangers (i.e., anion exchange resins technologies in advanced drinking water treatment processes along with activated carbon treatment. Ozonation), chlorine-resistant pathogenic organisms, and various micropollutants in drinking water treatment. In Japan

Takada, Shoji

453

Constraining global isoprene emissions with Global Ozone Monitoring Experiment (GOME) formaldehyde column measurements  

E-Print Network [OSTI]

Constraining global isoprene emissions with Global Ozone Monitoring Experiment (GOME) formaldehyde emission estimates are highly uncertain because of a lack of direct observations. Formaldehyde (HCHO the observation of this trace gas to help constrain isoprene emissions. We use HCHO column observations from

Chance, Kelly

454

Three-dimensional modeling of ozone on Mars Franck Lefe`vre,1  

E-Print Network [OSTI]

picture of a global anticorrelation between the ozone (O3) and water vapor columns. However and Structure: Middle atmosphere--constituent transport and chemistry (3334); 5405 Planetology: Solid Surface Planets: Atmospheres--composition and chemistry; 6225 Planetology: Solar System Objects: Mars; KEYWORDS

Forget, François

455

The impact of large scale biomass production on ozone air pollution in Joost B. Beltman a  

E-Print Network [OSTI]

The impact of large scale biomass production on ozone air pollution in Europe Joost B. Beltman a , Carlijn Hendriks a , Markus Tum b , Martijn Schaap a,* a TNO, Department of Climate, Air by up to 25% and 40%. Air pollution mitigation strategies should consider land use management. a r t i

Utrecht, Universiteit

456

Synthesis of nickel–zinc ferrite magnetic nanoparticle and dye degradation using photocatalytic ozonation  

SciTech Connect (OSTI)

Graphical abstract: Display Omitted Highlights: ? Nickel–zinc ferrite magnetic nanoparticle (NZFMN) was synthesized and characterized. ? Dye degradation by photocatalytic ozonation using NZFMN was studied. ? Formate, acetate and oxalate were detected as dominant dye degradation aliphatic intermediates. ? Nitrate, sulfate and chloride ions were detected as mineralization products of dyes. ? NZFMN was an effective magnetic nanocatalyst to degrade dyes. -- Abstract: In this paper, nickel–zinc ferrite magnetic nanoparticle (NZFMN) was synthesized and its dye degradation ability using photocatalytic ozonation was investigated. The NZFMN was characterized by X-ray diffraction (XRD), scanning electron microscopic (SEM), Fourier transforms infrared (FTIR) and alternative gradient force magnetometer (AGFM). Reactive Red 198 (RR198) and Direct Green 6 (DG6) were used as dye models. UV–vis and ion chromatography (IC) analyses were employed to study dye degradation. The effects of operational parameters on decolorization such as NZFMN dosage, dye concentration, salt and pH were studied. RR198 and DG6 were completely decolorized (100%) by photocatalytic ozonation using NZFMN. Formate, acetate and oxalate anions were detected as dominant aliphatic intermediates. Nitrate, sulfate and chloride ions were detected as mineralization products of dyes. Results showed that the photocatalytic ozonation using NZFMN was a very effective method for dye degradation.

Mahmoodi, Niyaz Mohammad, E-mail: mahmoodi@icrc.ac.ir [Department of Environmental Research, Institute for Color Science and Technology, Tehran (Iran, Islamic Republic of); Bashiri, Marziyeh; Moeen, Shirin Jebeli [Department of Environmental Research, Institute for Color Science and Technology, Tehran (Iran, Islamic Republic of)] [Department of Environmental Research, Institute for Color Science and Technology, Tehran (Iran, Islamic Republic of)

2012-12-15T23:59:59.000Z

457

Supporting Information for Impact of Chlorine Emissions from Sea-Salt Aerosol on Coastal Urban Ozone  

E-Print Network [OSTI]

DIOXIDE H2O2 HYDROGEN PEROXIDE NH3 AMMONIA NIT AEROSOL NITRATE SO2 SULFUR DIOXIDE SO3 SULFUR TRIOXIDE OSD extensions* NO NITRIC OXIDE NO2 NITROGEN DIOXIDE O3 OZONE HONO NITROUS ACID HNO3 NITRIC ACID HNO4 PERNITRIC ACID N2O5 NITROGEN PENTOXIDE NO3 NITRATE RADICAL HO2 HYDROPEROXY RADICAL CO CARBON MONOXIDE CO2 CARBON

Dabdub, Donald

458

INTERRELAITONS BETWEEN VARIABILITY OF GROUND-LEVEL OZONE AND LAND COVER CHANGE  

E-Print Network [OSTI]

ozone monitoring stations in Connecticut and Rohde Island were used for the analysis. The monitoring stations were classified into different categories based on their locations and land cover characteristics. Cars and gasoline-burning engines are large sources of VOCs. VOCs also come from consumer products

Wang, Y.Q. "Yeqiao"

459

Growth and crown architecture of two aspen genotypes exposed to interacting ozone and carbon dioxide  

E-Print Network [OSTI]

Growth and crown architecture of two aspen genotypes exposed to interacting ozone and carbon to O3, atmos- pheric carbon dioxide (CO2) concentrations are increasing rapidly (Keeling et al., 1995 concentrations may offset the detrimental effects of increasing O3 (Allen, 1990). Some studies have shown that CO

460

A Laboratory Method For Measuring The Ozone Emission From In-duct Air Cleaners.  

E-Print Network [OSTI]

: Emission rate, HVAC air cleaners, electrostatic precipitators, coronas, standard test method 1 Introduction Subchapter 8.7). However, in-duct air cleaners including electronic air cleaners, electrostatic precipitators of an ozone analyzer. Viner et al. (1992) studied commercial in-duct electrostatic precipitators and observed

Siegel, Jeffrey

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Earth'sFuture Stratospheric ozone response to a solar irradiance reduction  

E-Print Network [OSTI]

the stratospheric ozone response to a proposed geoengineering activity wherein a reduced top-of-atmosphere (TOA to the Geoengineering Model Intercomparison Project (GeoMIP) Experiment G1. Three primary simulations were completed geoengineering activities have been proposed as possible techniques to help counteract the ongoing climate change

Jackman, Charles H.

462

Stratospheric ozone response to sulfate geoengineering: Results from the Geoengineering Model  

E-Print Network [OSTI]

Stratospheric ozone response to sulfate geoengineering: Results from the Geoengineering Model for Atmospheric Research, Boulder, Colorado, USA Abstract Geoengineering with stratospheric sulfate aerosols has the experiments G3 and G4 of the Geoengineering Model Intercomparison Project. On average, the models simulate

Robock, Alan

463

Probing into regional ozone and particulate matter pollution in the United States  

E-Print Network [OSTI]

) and fine particulate matter (PM2.5) air pollution and associated health effects have been one of the majorProbing into regional ozone and particulate matter pollution in the United States: 1. A 1 year CMAQ-term simulations using the Community Multiscale Air Quality (CMAQ) modeling system and subsequent process analyses

Jacobson, Mark

464

Ozone depletion during the solar proton events of October//November 2003 as seen by SCIAMACHY  

E-Print Network [OSTI]

Ozone depletion during the solar proton events of October//November 2003 as seen by SCIAMACHY G changes caused by the solar proton events from 26 October to 6 November 2003, known as the ``Halloween differences are given. Two regimes can be distinguished, one above about 50 km dominated by HOx (H, OH, HO2

Steinhoff, Heinz-Jürgen

465

PublishedbyManeyPublishing(c)IOMCommunicationsLtd Influence of UV irradiation and ozone on  

E-Print Network [OSTI]

of purified humid air containing predetermined quantities of SO2, NO2, H2S, Cl2, HCI, NH3 and O3. This lackPublishedbyManeyPublishing(c)IOMCommunicationsLtd Influence of UV irradiation and ozone by ultraviolet (UV) light was investigated. A modified coulometric reduction technique was used, substituting

466

Earth'sFuture Multidecadal global cooling and unprecedented ozone loss  

E-Print Network [OSTI]

Earth'sFuture Multidecadal global cooling and unprecedented ozone loss following a regional nuclear inertia and albedo effects in the ocean and expanded sea ice. The combined cooling and enhanced UV would put significant pressures on global food supplies and could trigger a global nuclear famine. Knowledge

Robock, Alan

467

Interactions of ozone and pathogens on the surface structure of Norway spruce needles  

E-Print Network [OSTI]

Interactions of ozone and pathogens on the surface structure of Norway spruce needles K. Ojanperä S and pathogens. It also acts as a barrier to air pollutants (Jeffree, 1986). The epicuticular wax of Norway and then a plate-like wax structure (Sauter and Voss, 1986). The life span of healthy needles of Norway spruce

Paris-Sud XI, Université de

468

Characterization and correction of Global Ozone Monitoring Experiment 2 ultraviolet measurements and application  

E-Print Network [OSTI]

analysis indicates that reflectance degradation began at the beginning of the mission; the reflectance degrades by 15% around 290 nm and by 2.2% around 325 nm from 2007 through 2009. Degradation shows of radiance in the ultraviolet (UV) region is essential for retrievals of ozone profiles especially

Chance, Kelly

469

White Pine Emission Trends of Monoterpenes and Sesquiterpenes After Acute Ozone Exposure  

E-Print Network [OSTI]

White Pine Emission Trends of Monoterpenes and Sesquiterpenes After Acute Ozone Exposure Daniel M of White Pine (Pinus strobus) specimens located at the University of Michigan Biological Station (UMBS). To measure terpene production, dynamic branch enclosures were simultaneously positioned on White Pine

Collins, Gary S.

470

Thickness influence on surface morphology and ozone sensing properties of nanostructured ZnO transparent  

E-Print Network [OSTI]

, 71004 Heraklion, Crete, Greece Available online 19 January 2006 Abstract Transparent zinc oxide (Zn Keywords: Zinc oxide; PLD; AFM; Ozone 1. Introduction Zinc oxide (ZnO) is an n-type semiconductor devices [3], varistors, planar optical waveguides [4], transparent electrodes [5,6], ultraviolet

471

A neural emission-receptor model for ozone reduction S.Barazzetta, G. Corani  

E-Print Network [OSTI]

in air pollution studies because of their impact on human health and agricultural crops and forests. High,guariso@elet.polimi.it Abstract: Ground level ozone pollution is a complex phenomenon heavily affecting industrialized and pop problem that determines the least cost alternatives to obtain a given air quality standard. The decision

Corani, Giorgio

472

Author's personal copy Digestive utilization of ozone-exposed forage by rabbits (Oryctolagus cuniculus)  

E-Print Network [OSTI]

Author's personal copy Digestive utilization of ozone-exposed forage by rabbits (Oryctolagus Digestibility Forage quality Herbivore nutrition Phenolics Rabbits Southern Piedmont a b s t r a c t A mixture) in a digestibility experiment. Forages and feed refusals were analyzed for concentrations of total cell wall

Ditchkoff, Steve

473

The Economic Impact of Global Climate and Tropospheric Ozone on World Agricultural Production  

E-Print Network [OSTI]

by Xiaodu (Dulles) Wang Bachelor of Science with majors in Electrical Engineering, Economics and ComputerThe Economic Impact of Global Climate and Tropospheric Ozone on World Agricultural Production Engineering The Johns Hopkins University, June 2003 Submitted to the Engineering Systems Division

474

Net ecosystem fluxes of isoprene over tropical South America inferred from Global Ozone Monitoring Experiment (GOME)  

E-Print Network [OSTI]

Net ecosystem fluxes of isoprene over tropical South America inferred from Global Ozone Monitoring estimate isoprene emissions over tropical South America during 1997­2001 using column measurements (ATSR) firecounts and GOME NO2 columns. We find that South America can be split into eastern and western

Chance, Kelly

475

Ground-level ozone in the 21st century: future trends,  

E-Print Network [OSTI]

Ground-level ozone in the 21st century: future trends, impacts and policy implications October 2008 Price £39 web royalsociety.org Science Policy REPORT 15/08 #12;Cover image: Sunrise over the River Ganges in Varanasi, India showing a sunny and polluted sky, characteristic of photochemical smog

476

Transport of Asian ozone pollution into surface air over the western United States in spring  

E-Print Network [OSTI]

Transport of Asian ozone pollution into surface air over the western United States in spring Meiyun the mechanisms involved in the transport of Asian pollution plumes into western U.S. surface air through, including the interleaving and mixing of Asian pollution and stratospheric air associated with complex

477

Failure of ozone and nitrogen dioxide to enhance lung tumor development in hamsters  

SciTech Connect (OSTI)

We tested the hypothesis that the two common oxidant air pollutants, ozone and nitrogen dioxide, modulate the development of respiratory tract tumors in Syrian golden hamsters. The animals received subcutaneous injections of the carcinogen diethylnitrosamine (20 mg/kg) twice a week while being exposed continuously to an atmosphere of 0.8 parts per million (ppm)* of ozone or 15 ppm of nitrogen dioxide. Animals were killed 16 weeks or 24 to 32 weeks after the beginning of the treatment. Ozone delayed the appearance of tracheal tumors and reduced the incidence of tumors in the lung periphery. A suspected neuroendocrine differentiation of those lung tumors could not be established by immunocytochemistry due to overfixation of tissues. On the other hand, ozone seemed to mitigate development of hepatotoxic lesions mediated by diethylnitrosamine. In animals treated with diethylnitrosamine and exposed to nitrogen dioxide, fewer tracheal tumors and no lung tumors were found. Only a few lung tumors were produced in animals treated with diethylnitrosamine and kept in an atmosphere of 65% oxygen. The previously observed neuroendocrine nature of tumors induced by simultaneous exposure to diethylnitrosamine and hyperoxia could not be established because the long fixation of tissues precluded immunocytochemical stains. Animals treated with diethylnitrosamine and kept in filtered air while being housed in wire-mesh cages developed fewer lung tumors than animals given the same treatment and kept on conventional bedding in shoebox cages. Although all inhalants tested are known to produce substantial cell proliferation in the respiratory tract, it was not possible to document whether this would enhance lung tumor development. The role of the two common air pollutants, ozone and nitrogen dioxide, as possible additional risks in the pathogenesis of lung cancer in animals continues to remain uncertain.

Witschi, H.; Breider, M.A.; Schuller, H.M. (Univ. of California, Davis, CA (United States))

1993-09-01T23:59:59.000Z

478

Current Understanding of Cu-Exchanged Chabazite Molecular Sieves for Use as Commercial Diesel Engine DeNOx Catalysts  

SciTech Connect (OSTI)

Selective catalytic reduction (SCR) of NOx with ammonia using metal-exchanged molecular sieves with a chabazite (CHA) structure has recently been commercialized on diesel vehicles. One of the commercialized catalysts, i.e., Cu-SSZ-13, has received much attention for both practical and fundamental studies. For the latter, the particularly well-defined structure of this zeolite is allowing long-standing issues of the catalytically active site for SCR in metal-exchanged zeolites to be addressed. In this review, recent progress is summarized with a focus on two areas. First, the technical significance of Cu-SSZ-13 as compared to other Cu-ion exchanged zeolites (e.g., Cu-ZSM-5 and Cu-beta) is highlighted. Specifically, the much enhanced hydrothermal stability for Cu-SSZ-13 compared to other zeolite catalysts is addressed via performance measurements and catalyst characterization using several techniques. The enhanced stability of Cu-SSZ-13 is rationalized in terms of the unique small pore structure of this zeolite catalyst. Second, the fundamentals of the catalytically active center; i.e., the chemical nature and locations within the SSZ-13 framework are presented with an emphasis on understanding structure-function relationships. For the SCR reaction, traditional kinetic studies are complicated by intra-particle diffusion limitations. However, a major side reaction, nonselective ammonia oxidation by oxygen, does not suffer from mass-transfer limitations at relatively low temperatures due to significantly lower reaction rates. This allows structure-function relationships that are rather well understood in terms of Cu ion locations and redox properties. Finally, some aspects of the SCR reaction mechanism are addressed on the basis of in-situ spectroscopic studies.

Gao, Feng; Kwak, Ja Hun; Szanyi, Janos; Peden, Charles HF

2013-11-03T23:59:59.000Z

479

Latest developments and application of DB Riley`s low NOx CCV{reg_sign} burner technology  

SciTech Connect (OSTI)

Recent developments in DB Riley (DBR) low NO{sub x} burner technology and the application of this technology in coal fired utility boilers are discussed. Since the promulgation of the Clean Air Act Amendment in 1990, DBR has sold nearly 1500 Controlled Combustion Venturi (CCV{reg_sign}) burners on pulverized coal fired utility boilers reducing NOx emissions 50 - 70% from uncontrolled levels. This technology has been retrofitted on boiler designs ranging in size and type from 50 MW front wall fired boilers to 1300 MW opposed fired cell type boilers. In DBR`s latest version of the CCV{reg_sign} burner, a second controlled flow air zone was added to enhance NO{sub x} control capability. Other developments included improved burner air flow measurement accuracy and several mechanical design upgrades such as new coal spreader designs for 3 year wear life. Test results of the CCV{reg_sign} dual air zone burner in DBR`s 100 million Btu/hr (29 MW) coal burner test facility are presented. In the test program, coals from four utility boiler sites were fired to provide a range of coal properties. A baseline high volatile bituminous coal was also fired to provide a comparison with 1992 test data for the CCV{reg_sign} single register burner. The test results showed that the second air zone enhanced NO{sub x} reduction capability by an additional 20% over the single register design. Computational fluid dynamic (CFD) modeling results of the CCV{reg_sign} dual air zone burner are also presented showing near field mixing patterns conducive to low NO{sub x} firing.

Penterson, C.; Ake, T. [DB Riley, Inc., Worcester, MA (United States)

1998-04-01T23:59:59.000Z

480

Central solar heating plants with seasonal storage in mines  

SciTech Connect (OSTI)

The solar assisted heat supply of building offers a great technical potential for the substitution of fossil energy sources. Central solar Heating Plants with Seasonal Storage (CSHPSS) supply 100 and more buildings and reach a solar fraction of 50% or more of the total load with far less specific heat costs [$/kWh{sub solar}] compared to small domestic hot water systems (DHW) for single-family houses. However, the construction of seasonal storage is too expensive. At the Ruhu University Bochum the use of mines for a seasonal storage of low temperature heat is examined in cooperation with industrial partners. The use of available storage volumes may lead to a decrease of investment costs. Additional geothermal heat gains can be obtained from the warm surrounding rock; therefore a high efficiency can be achieved.

Eikmeier, B.; Mohr, M.; Unger, H.

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "nox ozone season" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Five blind men and the elephant: what can the NASA Aura ozone measurements tell us about stratosphere-troposphere exchange?  

E-Print Network [OSTI]

Five blind men and the elephant: what can the NASA Auraof the five blind men and the elephant, where the five Auramen” who are touching the “elephant” (ozone) in dif- ferent

Tang, Q.; Prather, M. J

2012-01-01T23:59:59.000Z

482

Climate change, ambient ozone, and health in 50 US cities Michelle L. Bell & Richard Goldberg & Christian Hogrefe &  

E-Print Network [OSTI]

Climate change, ambient ozone, and health in 50 US cities Michelle L. Bell & Richard Goldberg Haven, CT 06511, USA e-mail: michelle.bell@yale.edu R. Goldberg Center for Climate Systems Research emissions of volatile organic compounds (VOCs),

483

Re-evaluation of total and Umkehr ozone data from NOAA-CMDL Dobson spectrophotometer observatories. Final report  

SciTech Connect (OSTI)

This report describes work to improve the quality of total ozone and Umkehr data obtained in the past at the NOAA Climate Monitoring and Diagnostics Laboratory and the Dobson spectrophotometer ozone observatories. The authors present results of total ozone data re-evaluations for ten stations: Byrd, Antarctica; Fairbanks, Alaska; Hallett, Antarctica; Huancayo, Peru; Haute Provence, France; Lauder, New Zealand; Perth, Australia; Poker Flat, Alaska; Puerto Montt, Chile; and South Pole, Antarctica. The improved data will be submitted in early 1996 to the World Meteorological Organization (WMO) World Ozone Data Center (WODC), and the Atmospheric Environment Service for archiving. Considerable work has been accomplished, also, in reevaluating Umkehr data from seven of the stations, viz., Huancayo, Haute Provence, Lauder, Perth, Poker Flat, Boulder, Colorado; and Mauna Loa, Hawaii.

Komhyr, W.D.; Quincy, D.M.; Grass, R.D.; Koenig, G.L. [Univ. of Colorado, Boulder, CO (United States)] [Univ. of Colorado, Boulder, CO (United States); [National Oceanic and Atmospheric Administration, Boulder, CO (United States). Climate Monitoring and Diagnostics Lab.

1995-12-01T23:59:59.000Z

484

Effects of a modular two-step ozone-water and annealing process on silicon carbide graphene  

SciTech Connect (OSTI)

By combining ozone and water, the effect of exposing epitaxial graphene on silicon carbide to an aggressive wet-chemical process has been evaluated after high temperature annealing in ultra high vacuum. The decomposition of ozone in water produces a number of oxidizing species, however, despite long exposure times to the aqueous-ozone environment, no graphene oxide was observed after the two-step process. The systems were comprehensively characterized before and after processing using Raman spectroscopy, core level photoemission spectroscopy, and angle resolved photoemission spectroscopy together with low energy electron diffraction, low energy electron microscopy, and atomic force microscopy. In spite of the chemical potential of the aqueous-ozone reaction environment, the graphene domains were largely unaffected raising the prospect of employing such simple chemical and annealing protocols to clean or prepare epitaxial graphene surfaces.

Webb, Matthew J., E-mail: matthew.webb@cantab.net; Lundstedt, Anna; Grennberg, Helena [Department of Chemistry—BMC, Uppsala University, Box 576, SE-751 23 Uppsala (Sweden); Polley, Craig; Niu, Yuran; Zakharov, Alexei A.; Balasubramanian, Thiagarajan [MAX IV Laboratory, Lund University, 22100 Lund (Sweden); Dirscherl, Kai [DFM—Danish Fundamental Metrology, Matematiktorvet 307, DK-2800 Lyngby (Denmark); Burwell, Gregory; Guy, Owen J. [College of Engineering, Faraday Tower, Singleton Park, Swansea University, Swansea SA2 8PP (United Kingdom); Palmgren, Pål [VG Scienta Scientific AB, Box 15120, Vallongatan 1, SE-750 15 Uppsala (Sweden); Yakimova, Rositsa [Department of Physics, Chemistry, and Biology, Linköping University, SE-581 83 Linköping (Sweden)

2014-08-25T23:59:59.000Z

485

Past and Future Effects of Ozone on Net Primary Production and Carbon Sequestration Using a Global Biogeochemical Model  

E-Print Network [OSTI]

Exposure of plants to ozone inhibits photosynthesis and therefore reduces vegetation production and carbon sequestration. Simulations with the Terrestrial Ecosystem Model (TEM) for the historical period (1860-1995) show ...

Felzer, Benjamin Seth.

486

Ozone effects on net primary production and carbon sequestration in the conterminous United States using a biogeochemistry model  

E-Print Network [OSTI]

The effects of air pollution on vegetation may provide an important control on the carbon cycle that has not yet been widely considered. Prolonged exposure to high levels of ozone, in particular, has been observed to inhibit ...

Felzer, Benjamin Seth.; Kicklighter, David W.; Melillo, Jerry M.; Wang, Chien.; Zhuang, Qianlai.; Prinn, Ronald G.

487

Reduction of Stored NOx on Pt/AlO and Pt/BaO/AlO Catalysts with H and CO. |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1 -the Mid-Infrared at 278, 298,NIST 800-53 NationalTreatment. | EMSL NOx

488

Demonstration of Advanced Technologies for Multi-Load Washers in Hospitality and Healthcare – Ozone Based Laundry Systems  

SciTech Connect (OSTI)

The objective of this demonstration project was to evaluate market-ready retrofit technologies for reducing the energy and water use of multi-load washers in healthcare and hospitality facilities. Specifically, this project evaluated laundry wastewater recycling technology in the hospitality sector and ozone laundry technology in both the healthcare and hospitality sectors. This report documents the demonstration of ozone laundry system installations at the Charleston Place Hotel in Charleston, Sout Carolina, and the Rogerson House assisted living facility in Boston, Massachusetts.

Boyd, Brian K.; Parker, Graham B.; Petersen, Joseph M.; Sullivan, Greg; Goetzler, W.; Sutherland, T. A.; Foley, K. J.

2014-08-14T23:59:59.000Z

489

Surfactants containing radioactive run-offs: Ozone treatment, influence on nuclear power plants water waste special treatment  

SciTech Connect (OSTI)

The authors discuss the problems encountered in the efficiency of radioactive waste treatment in nuclear power plants in Kursk. The ozonization of aqueous solutions of surfactants was carried out in the laboratory`s ozonization system. The surfactants which are discharged to the ion exchangers deteriorate resins, clog up the ion exchangers, and decrease filtration velocity. Therefore, this investigation focused on finding a method to increase the efficiency of this treatment process.

Prokudina, S.A.; Grachok, M.A. [Belarussian State Economic Univ., Minsk (Belarus)

1993-12-31T23:59:59.000Z

490

Anthropogenic emissions of nonmethane hydrocarbons in the northeastern United States: Measured seasonal variations from  

E-Print Network [OSTI]

influenced by sources not associated with fuel combustion. Changes in the observed correlations of CO2 and CO relative to acetylene are consistent with published changes in the estimated emissions of CO2 and CO over these emissions in the United States. Hydrocarbon, NOx and CO sources include fuel combustion in both mobile

Cohen, Ronald C.

491

Membrane contactor/separator for an advanced ozone membrane reactor for treatment of recalcitrant organic pollutants in water  

SciTech Connect (OSTI)

An advanced ozone membrane reactor that synergistically combines membrane distributor for ozone gas, membrane contactor for pollutant adsorption and reaction, and membrane separator for clean water production is described. The membrane reactor represents an order of magnitude improvement over traditional semibatch reactor design and is capable of complete conversion of recalcitrant endocrine disrupting compounds (EDCs) in water at less than three minutes residence time. Coating the membrane contactor with alumina and hydrotalcite (Mg/Al=3) adsorbs and traps the organics in the reaction zone resulting in 30% increase of total organic carbon (TOC) removal. Large surface area coating that diffuses surface charges from adsorbed polar organic molecules is preferred as it reduces membrane polarization that is detrimental to separation. - Graphical abstract: Advanced ozone membrane reactor synergistically combines membrane distributor for ozone, membrane contactor for sorption and reaction and membrane separator for clean water production to achieve an order of magnitude enhancement in treatment performance compared to traditional ozone reactor. Highlights: Black-Right-Pointing-Pointer Novel reactor using membranes for ozone distributor, reaction contactor and water separator. Black-Right-Pointing-Pointer Designed to achieve an order of magnitude enhancement over traditional reactor. Black-Right-Pointing-Pointer Al{sub 2}O{sub 3} and hydrotalcite coatings capture and trap pollutants giving additional 30% TOC removal. Black-Right-Pointing-Pointer High surface area coating prevents polarization and improves membrane separation and life.

Chan, Wai Kit, E-mail: kekyeung@ust.hk [Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong); Joueet, Justine; Heng, Samuel; Yeung, King Lun [Department of Chemical and Biomolecular Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon (Hong Kong); Schrotter, Jean-Christophe [Water Research Center of Veolia, Anjou Recherche, Chemin de la Digue, BP 76. 78603, Maisons Laffitte, Cedex (France)

2012-05-15T23:59:59.000Z

492

A study of ozone in the surface layer of Kiev and its impact on the human health  

E-Print Network [OSTI]

Ground-level ozone in Kiev for an episode of its high concentration in August 2000 was simulated with the model of the urban air pollution UAM-V (Urban Airshed Model). The study of total ozone over Kiev and its concentration changes with height in the troposphere is made on the basis of ground-based observations with the infrared Fourier spectrometer at the Main Astronomical Observatory of National Academy of Sciences of Ukraine as a part of the ESA-NIVR-KNMI no 2907. In 2008 the satellite Aura-OMI data OMO3PR on the atmosphere ozone profiles became available. Beginning in 2005, these data include the ozone concentration in the lower layer of the atmosphere and can be used for the evaluation of the ground-level ozone concentrations in all cities of Ukraine. Some statistical investigation of ozone air pollution in Kiev and medical statistics data on respiratory system was carried out with the application of the "Statistica" package. The regression analysis, prognostic regression simulation, and retrospective p...

Shavrina, A V; Kiforenko, S I; Sheminova, V A; Veles, A A; Blum, O B

2012-01-01T23:59:59.000Z

493

Optimal Maintenance Scheduling of a Power Plant with Seasonal  

E-Print Network [OSTI]

-Wide Optimization Meeting · Plan preventive maintenance shutdowns ­ Minimize payment for skilled labor ­ Save onlineOptimal Maintenance Scheduling of a Power Plant with Seasonal Electricity Tariffs Pedro M. Castro maintenance team doing shutdowns · Shutdown period mandatory after [ , ] h online · Challenging (hard

Grossmann, Ignacio E.

494

On the reliability of seasonal forecasts Antje Weisheimer  

E-Print Network [OSTI]

On the reliability of seasonal forecasts Antje Weisheimer Weisheimer to achieving a "5"? à Use reliability of non-climatological forecastsDon: · if (X) C(X) à climatological (reliable) informaDon · if (X) C(X) à

Stevenson, Paul

495

EFFECT OF SEASON AND LOCATION ON THE RELATIONSHIP BETWEEN ZOOPLANKTON  

E-Print Network [OSTI]

biomass is usually reported as quantity of zooplankton per unit volume of water. Measures of quantity AND DRY WEIGHT IN THE NORTHWEST ATLANTIC! Biomass or "standing stock" is a routinely mea- sured index during different seasons can account for sample variability and more accurately convert between biomass

496

SEASONAL RECLAIMED WATER QUALITY; AN ASSESSMENT OFQUALITY; AN ASSESSMENT OF  

E-Print Network [OSTI]

and disinfect anyy microorganisms that may be present The majority of Recycled water produced in ArizonaSEASONAL RECLAIMED WATER QUALITY; AN ASSESSMENT OFQUALITY; AN ASSESSMENT OF BIOLOGICAL VARIABILITY Ch h M R k Ph D W t Q lit S i li tChannah M. Rock, Ph.D., Water Quality Specialist James Walworth, Ph

Fay, Noah

497

Spatial and Seasonal Trends in Biogenic Secondary Organic Aerosol  

E-Print Network [OSTI]

Spatial and Seasonal Trends in Biogenic Secondary Organic Aerosol Tracers and Water-Soluble Organic biogenic secondary organic aerosol (SOA) tracers via gas chromatography-mass spectrometry (GC natural and anthropogenic sources and is dominated by terrestrial plant foliage (7). The global

Zheng, Mei

498

Seasonal variation in thyroxine in the American alligator (Alligator mississippiensis)  

E-Print Network [OSTI]

. Thyroxine (T4) varied over a wide range from 0.5 to 57 ng/mL. Triiodothyronine (T3) levels were below the sensitivity of the assay (<0.6ng/mL). A distinct seasonal peak in T4 was observed between December and April, peaking in March with highest mean T4...

Crawford, Jared Louis

2004-09-30T23:59:59.000Z

499

Seasonal glacier melt contribution to streamflow Neil Schaner  

E-Print Network [OSTI]

source is perennial snow, firn, or ice. We include all ice caps (ice sheets covering less than 50,000 km21 Seasonal glacier melt contribution to streamflow Neil Schaner Department of Civil is the population at risk to future glacier changes. We estimate an upper bound on glacier melt contribution

Washington at Seattle, University of

500

A season without worry Summer gasoline demand 1993  

SciTech Connect (OSTI)

Refining margins in the US appear to be widening after a few lean years. With the US cautiously emerging from its recession, large stock builds and high refinery utilization rates reflect a sense of optimism among refiners for robust petroleum product demand during the Summer 1993 driving season.

Not Available

1993-05-31T23:59:59.000Z