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	Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process
	Zhang, Yanwen ; Cai, Ningsheng ; Yang, Jingbiao ; Xu, Bo
	2010-05-11 ; 2010-05-11 ; OCT
关键词	SNCR (selective non-catalytic reduction) Additive NOx removal Kinetic modeling FLOW REACTOR SNCR PROCESS NO REMOVAL COMBUSTION AMMONIA ADDITIVES CHEMISTRY MECHANISM FUEL UREA Environmental Sciences
中文摘要	The reduction of nitric oxide using ammonia combined with methane and pulverized coal additives has been studied in a drop tube furnace reactor. Simulated flue gas with 1000 ppm NOx and 3.4% excess oxygen was generated by cylinder gas. Experiments were performed in the temperature range of 7001200 degrees C to investigate the effects of additives on the DeNO(x) performance. Subsequently, a kinetic mechanism was modified and validated based on experimental results, and a computational kinetic modeling with CHEMKIN was conducted to analyze the secondary pollutants. For both methane and pulverized coal additives, the temperature window is shifted towards lower temperatures. The appropriate reaction temperature is shifted to about 900 and 800 degrees C. respectively with 1000 ppm methane and 0.051 g min(-1) pulverized lignite coal. The addition of methane and pulverized coal widens the temperature window towards lower temperature suggesting a low temperature application of the process. Furthermore, selective non-catalytic reduction (SNCR) reaction rate is accelerated evidently with additives and the residence time to complete the reaction is shortened distinctly. NO, reduction efficiency with 80% is achieved in about 0.3 s without additive at 1000 degrees C. However, it is achieved in only about 0.2 s with 100 ppm methane as additive, and only 0.07 and 0.05 s are needed respectively for the cases of 500 and 1000 ppm methane. The modified kinetic modeling agrees well with the experimental results and reveals additional information about the process. Investigation on the byproducts where NO2 and N2O were analyzed by modeling and the others were investigated by experimental means indicates that emissions would not increase with methane and pulverized coal additions in SNCR process and the efficacious temperature range of SNCR reaction is widened approximately with 100 degrees C. Crown Copyright (c) 2008 Published by Elsevier Ltd. All rights reserved.
语种	英语 ; 英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25596]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang, Yanwen,Cai, Ningsheng,Yang, Jingbiao,et al. Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process[J],2010, 2010, OCT.
APA	Zhang, Yanwen,Cai, Ningsheng,Yang, Jingbiao,&Xu, Bo.(2010).Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process..
MLA	Zhang, Yanwen,et al."Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process".(2010).

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