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Title: Second Generation Advanced Reburning for High Efficiency N0x Control

Abstract

Energy and Environmental Research Corporation is developing a family of high efficiency and low cost NO{sub x} control technologies for coal fired utility boilers based on Advanced Reburning (AR), a synergistic integration of basic reburning with injection of an N-agent. In conventional AR, injection of the reburn fuel is followed by simultaneous N-agent and overfire air injection. The second generation AR systems incorporate several components which can be used in different combinations. These components include: (1) Reburning Injection of the reburn fuel and overfire air. (2) N-agent Injection The N-agent (ammonia or urea) can be injected at different locations: into the reburning zone, along with the overfire air, and downstream of the overfire air injection. (3) N-agent Promotion Several sodium compounds can considerably enhance the NO{sub x} control from N-agent injection. These ''promoters'' can be added to aqueous N-agents. (4) Two Stages of N-agent Injection and Promotion Two N-agents with or without promoters can be injected at different locations for deeper NO{sub x} control. AR systems are intended for post-RACT applications in ozone non-attainment areas where NO{sub x} control in excess of 80% is required. AR will provide flexible installations that allow NO{sub x} levels to be lowered when regulationsmore » become more stringent. The total cost of NO{sub x} control for AR systems is approximately half of that for SCR. Experimental and kinetic modeling results for development of these novel AR systems are presented. Tests have been conducted in a 1.0 MMBtu/hr Boiler Simulator Facility with coal as the main fuel and natural gas as the reburning fuel. The results show that high efficiency NO{sub x} control, in the range 84-95%, can be achieved with various elements of AR. A comparative byproduct emission study was performed to compare the emissions from different variants of AR with commercial technologies (reburning and SNCR). For each technology sampling included: CO, SO{sub 2}, N{sub 2}O, total hydrocarbons, NH{sub 3}, HCN, SO{sub 3}, fly ash mass loading and size distribution, PM10, and carbon in ash. AR technologies do not generate significant byproduct emissions in comparison with basic reburning and SNCR processes under similar conditions. In most cases, byproduct emissions were found to be lower for the AR technologies. Kinetic modeling predictions qualitatively explain the experimental trends observed in the combustion tests. The detailed reaction mechanism can describe the interaction of NO and ammonia in the reburning and overfire air zones, the effect of mixing times, and the sodium promotion effect.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Energy and Environmental Research Corp., Irvine, CA (US)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE) (US)
OSTI Identifier:
16497
Report Number(s):
DOE/PC/95251-98/C0924; CONF-970772-
ON: DE98051621; TRN: US200432%%326
DOE Contract Number:  
AC22-95PC95251
Resource Type:
Conference
Resource Relation:
Conference: Advanced Coal-Based Power and Environmental Systems '97 Conference, Pittsburgh, PA (US), 07/22/1997--07/24/1997; Other Information: Supercedes report DE98051621; PBD: 31 Dec 1997
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 03 NATURAL GAS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMMONIA; BOILERS; CARBON; COAL; COMBUSTION; EFFICIENCY; FLY ASH; HYDROCARBONS; KINETICS; NATURAL GAS; OZONE; REACTION KINETICS; SIMULATION; SIMULATORS; SODIUM COMPOUNDS; UREA

Citation Formats

Zamansky, Vladimir M., Maly, Peter, M., Sheldon, Mark, Seeker, W. Randall, and Folsom, Blair A.. Second Generation Advanced Reburning for High Efficiency N0x Control. United States: N. p., 1997. Web.
Zamansky, Vladimir M., Maly, Peter, M., Sheldon, Mark, Seeker, W. Randall, & Folsom, Blair A.. Second Generation Advanced Reburning for High Efficiency N0x Control. United States.
Zamansky, Vladimir M., Maly, Peter, M., Sheldon, Mark, Seeker, W. Randall, and Folsom, Blair A.. Wed . "Second Generation Advanced Reburning for High Efficiency N0x Control". United States. https://www.osti.gov/servlets/purl/16497.
@article{osti_16497,
title = {Second Generation Advanced Reburning for High Efficiency N0x Control},
author = {Zamansky, Vladimir M. and Maly, Peter, M. and Sheldon, Mark and Seeker, W. Randall and Folsom, Blair A.},
abstractNote = {Energy and Environmental Research Corporation is developing a family of high efficiency and low cost NO{sub x} control technologies for coal fired utility boilers based on Advanced Reburning (AR), a synergistic integration of basic reburning with injection of an N-agent. In conventional AR, injection of the reburn fuel is followed by simultaneous N-agent and overfire air injection. The second generation AR systems incorporate several components which can be used in different combinations. These components include: (1) Reburning Injection of the reburn fuel and overfire air. (2) N-agent Injection The N-agent (ammonia or urea) can be injected at different locations: into the reburning zone, along with the overfire air, and downstream of the overfire air injection. (3) N-agent Promotion Several sodium compounds can considerably enhance the NO{sub x} control from N-agent injection. These ''promoters'' can be added to aqueous N-agents. (4) Two Stages of N-agent Injection and Promotion Two N-agents with or without promoters can be injected at different locations for deeper NO{sub x} control. AR systems are intended for post-RACT applications in ozone non-attainment areas where NO{sub x} control in excess of 80% is required. AR will provide flexible installations that allow NO{sub x} levels to be lowered when regulations become more stringent. The total cost of NO{sub x} control for AR systems is approximately half of that for SCR. Experimental and kinetic modeling results for development of these novel AR systems are presented. Tests have been conducted in a 1.0 MMBtu/hr Boiler Simulator Facility with coal as the main fuel and natural gas as the reburning fuel. The results show that high efficiency NO{sub x} control, in the range 84-95%, can be achieved with various elements of AR. A comparative byproduct emission study was performed to compare the emissions from different variants of AR with commercial technologies (reburning and SNCR). For each technology sampling included: CO, SO{sub 2}, N{sub 2}O, total hydrocarbons, NH{sub 3}, HCN, SO{sub 3}, fly ash mass loading and size distribution, PM10, and carbon in ash. AR technologies do not generate significant byproduct emissions in comparison with basic reburning and SNCR processes under similar conditions. In most cases, byproduct emissions were found to be lower for the AR technologies. Kinetic modeling predictions qualitatively explain the experimental trends observed in the combustion tests. The detailed reaction mechanism can describe the interaction of NO and ammonia in the reburning and overfire air zones, the effect of mixing times, and the sodium promotion effect.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 1997},
month = {Wed Dec 31 00:00:00 EST 1997}
}

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