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Title: Coal reburning for cyclone boiler NO sub x control demonstration

Abstract

Babcock Wilcox engineering studies followed by pilot-scale testing has developed/confirmed the potential of utilizing gas, oil or coal reburning as a viable NO{sub x} reduction technology. To date, two US sponsored programs promote natural gas/oil as a reburning fuel because it was believed that gas/oil will provide significantly higher combustion efficiency than using coal at the reburn zone. Although B W has shown that gas/oil reburning will play a role in reducing NO{sub x} emissions from cyclone boilers, B W coal reburning research has also shown that coal as a reburning fuel performs nearly as well as gas/oil without deleterious effects on combustion efficiency. This means that boilers using reburning for NO, control can maintain 100% coal usage instead of switching to 20% gas/oil for reburning. As a result of the B W performed coal reburning research, the technology has advanced to the point which it is now ready for demonstration on a commercial scale.

Publication Date:
Research Org.:
Babcock and Wilcox Co., Cassville, WI (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7205357
Report Number(s):
DOE/PC/89659-T9
ON: DE92018484
DOE Contract Number:
FC22-90PC89659
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 20 FOSSIL-FUELED POWER PLANTS; 54 ENVIRONMENTAL SCIENCES; FLUE GAS; DENITRIFICATION; NITROGEN OXIDES; AIR POLLUTION CONTROL; BOILERS; DEMONSTRATION PROGRAMS; NATURAL GAS; OILS; PROGRESS REPORT; STAGED COMBUSTION; CHALCOGENIDES; CHEMICAL REACTIONS; COMBUSTION; CONTROL; DOCUMENT TYPES; ENERGY SOURCES; FLUIDS; FOSSIL FUELS; FUEL GAS; FUELS; GAS FUELS; GASEOUS WASTES; GASES; NITROGEN COMPOUNDS; ORGANIC COMPOUNDS; OTHER ORGANIC COMPOUNDS; OXIDATION; OXIDES; OXYGEN COMPOUNDS; POLLUTION CONTROL; THERMOCHEMICAL PROCESSES; WASTES; 010800* - Coal, Lignite, & Peat- Waste Management; 014000 - Coal, Lignite, & Peat- Combustion; 200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions; 540120 - Environment, Atmospheric- Chemicals Monitoring & Transport- (1990-)

Citation Formats

Not Available. Coal reburning for cyclone boiler NO sub x control demonstration. United States: N. p., 1992. Web. doi:10.2172/7205357.
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Not Available. Coal reburning for cyclone boiler NO sub x control demonstration. United States. doi:10.2172/7205357.
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Not Available. Wed . "Coal reburning for cyclone boiler NO sub x control demonstration". United States. doi:10.2172/7205357. https://www.osti.gov/servlets/purl/7205357.
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@article{osti_7205357,
title = {Coal reburning for cyclone boiler NO sub x control demonstration},
author = {Not Available},
abstractNote = {Babcock Wilcox engineering studies followed by pilot-scale testing has developed/confirmed the potential of utilizing gas, oil or coal reburning as a viable NO{sub x} reduction technology. To date, two US sponsored programs promote natural gas/oil as a reburning fuel because it was believed that gas/oil will provide significantly higher combustion efficiency than using coal at the reburn zone. Although B W has shown that gas/oil reburning will play a role in reducing NO{sub x} emissions from cyclone boilers, B W coal reburning research has also shown that coal as a reburning fuel performs nearly as well as gas/oil without deleterious effects on combustion efficiency. This means that boilers using reburning for NO, control can maintain 100% coal usage instead of switching to 20% gas/oil for reburning. As a result of the B W performed coal reburning research, the technology has advanced to the point which it is now ready for demonstration on a commercial scale.},
doi = {10.2172/7205357},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}
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Technical Report:
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DOI:  10.2172/7205357
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  • A Program Opportunity Notice (PON) was issued by the Department of Energy (DOE) in February 1988, soliciting proposals to demonstrate technologies capable of being commercialized in the 1990's that are more cost effective than current technologies and capable of achieving significant reduction of sulfur dioxide (SO{sub 2}) and/or nitrogen oxides (NO{sub x}) emissions from existing coal burning facilities. One of the proposals selected is the Babcox Wilcox Company (B W) project that will demonstrate an innovative technology to reduce nitrogen oxide emissions from coal-fired cyclone boilers. This technology consists of burning a portion of the coal fuel in an oxygen-deficientmore » atmosphere in a reburning zone. To destroy the nitrogen oxides formed in the main combustion zone, the reburning is located above the combustion zone of the boiler. The project will be conducted at the 100 megawatt (MWe) coal-fired Nelson Dewey Station Unit No. 2, owned by Wisconsin Power Light Company (WP L), located in Cassville, Wisconsin. The WP L plant is presently in commercial operation. The intent of this project is to demonstrate the technical and economic viability of retrofitting coal reburning on a cyclone boiler that is representative of those constructed before New Source Performance Standards (NSPS) became effective. 6 figs., 1 tab.« less

  • The Coal Reburning for cyclone Boiler No. Control Demonstration project progress for April, May, and June 1992 is identified in this ninth quarterly report and pertains to the on-going activities of Phase III -- Construction and Start-up and Phase III -- Operation and Disposition. The project involves retrofitting/testing the reburning technology at Wisconsin Power Light's 100 MWe Nelson Dewey Unit No. 2 in Cassville, Wisconsin to determine the commercial applicability of this technology to reduce NO[sub x] emission levels. Under Phase IIB additional tuning of the control system was completed and operation in the full automatic mode was carried outmore » in May, 1992 in anticipation of long-term testing. Phase IIB was complete at that point. Phase III activities emphasized completion of parametric optimization testing to characterize the reburn system. As of May 21, 1992, long-term testing with WP L operating the reburn system in full automatic in a load following mode, was under way. Preliminary results indicate that No. emissions reductions of 50% and greater have been achieved as a result of reburn operation at full load. Furnace exit gas temperature has been reduced by 150[degrees]F as a result of reburn operation, again at full load. This effect is less significant at lower loads. No adverse impact on slagging and fouling has been observed and precipitator performance remains essentially unchanged. Unburned carbon on ash losses appear to have increased during reburn operation. Preliminarily at full load, boiler thermal efficiency is reduced because of higher unburned carbon by between 0.3% and 0.7% in the worst case. Efficiency losses appear to be higher at low loads. This effect will be further quantified with long-term performance test data to be taken in September, 1992.« less

  • This quarterly report has been prepared for Phase 1, Phase 2A, and Phase 2B of the Coal Reburning for Cyclone Boiler NO{sub x} Control Demonstration Project. The period covered by the quarterly report is January through March 1991. This report represents the fourth three-month period of the project. The subject of this report identifies progress during the quarter for Phase 1 -- Design and Permitting and Phase 2A -- Long Lead-Time Item Procurement, and Phase 2B -- Construction and Start-up. Under Phase 1, the following activities will be discussed. Task 1 -- Management and Reporting included completing the Preliminary Designmore » Report. The Numerical and Physical Flow Modeling first draft report has been issued. The Baseline Characterization Report is due for completion in April 1991. Task 5 -- Design of the Reburn System, system drawings continue to be updated and revised. General engineering activities continue with emphasis on system controls and electrical design. Finally, Task 6 -- Permitting activities continue concentrating on Phase 2B items. Under Phase 2A -- Long Lead-Time Procurement, the flame scanner seal air fan, flame scanners, and the reburn system air monitors have been purchased. Phase 2B -- Construction and Start-up, involved completion of the foundation/substructure in March 1991, and spring outage activities, which included asbestos abatement and size reduction of the existing flue gas duct were completed. The reburn system design involves input from all the project's tasks and thus, this document assembles a summary of the tasks performed to date with the culmination being the proposed reburn system design.« less

  • The coal reburning for cyclone boiler NO{sub x} control demonstration project's 3rd Quarterly Report covering the time period of October, November, and December 1990 involves the work performed in Phase 1 -- Design and Permitting and Long Lead-Time Procurement. Phase 1 activities focused on finalizing each of the following tasks: management and reporting; review of reburn technology and pilot scale cyclone tests; numerical physical flow modeling; baseline characterization; design of reburning system; permitting. Specifically, the Project Evaluation Report for Phases 1 and 2A and the Continuation Application for Phase 2B were submitted to DOE/PETC for approval. The general arrangement drawingsmore » of the reburning system continued to be updated and revised. Work involving the preliminary final report for the numerical/physical flow modeling evaluation was initiated. Installation of the foundation for the pulverizer enclosure was begun. Finally, Phase 2A -- Long Lead-Time Item Procurement activities included purchasing the primary air fan and motor, the gravimetric feeder, the boiler data acquisition system, the pulverizer gear drive and motor, and materials to fabricate the pulverizer.« less

  • The coal reburning for cyclone boiler NO{sub x} control demonstration project will be carried out at the Nelson Dewey Station Unit No. 2 of Wisconsin Power and Light in Cassville, Wisconsin. Unit No. 2 is small enough (100 MWe) to limit project costs, but large enough to assure that the reburning technology can be successfully applied to the cyclone-fired utility boiler population. As part of the project, B W's 5 million Btu/hr SBS pilot facility will be utilized to duplicate the operating practices of WP L's Nelson Dewey Unit {number sign}2. The coal which is fired at Nelson Dewy willmore » be fired in the SBS cyclone and will also be utilized as the reburn fuel. During the field test phase it Nelson Dewey Station, emission and performance data will be acquired and analyzed before and after the coal reburn conversion to determine the NO{sub x} reduction and impact on boiler performance. Combining these combustion test results with physical and numerical flow modeling of the technology as applied to Dewey Unit {number sign}2, will provide a comprehensive test program not only for successful application of WP L's Unit, but for the cyclone population as a whole. The control system consists of commercially available equipment, such as a pulverizer, burners, a pneumatic coal transfer system, overfire air ports and a control system, all of which are well proven, reliable equipment that can be readily installed. Extensive power plant modification is not required to implement the reburn technology which will increase the potential for commercialization. Progress is discussed.« less