Kinetic Study of Promoted SNCR Process by Different Gas Additives

A detailed chemical kinetic model for promoted SNCR process by H 2 , CO and CH 4 was developed based on recent studies. The model was validated by available experimental data. The influence of H 2 , CO and CH 4 on SNCR process was investigated by chemical kinetics calculation. The results indicate t...

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Bibliographic Details
Main Authors: Qing-Xi, Cao, Liu, Hui, Wu, Shao-hua, Li-Ping, Zhao, Huang, Xia
Format: Conference Proceeding
Language:English
Subjects:
Additives
Boilers
Chemical processes
Combustion
Hydrogen
Kinetic theory
Nitrogen
Oxidation
Temperature distribution
Temperature sensors
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Summary:A detailed chemical kinetic model for promoted SNCR process by H 2 , CO and CH 4 was developed based on recent studies. The model was validated by available experimental data. The influence of H 2 , CO and CH 4 on SNCR process was investigated by chemical kinetics calculation. The results indicate that H 2 is more effective to lower SNCR temperature window than CO and CH 4 . While the additives concentration is low, CH 4 is more effective than CO. But when the molar ratio of additives and initial NO exceeds 3, the effect of CO begins to catch up that of CH 4 . The promotion mechanisms of them were identified through sensitivity and rate-of-production analysis. The effects of these additives on NO reduction are achieved principally by promoting the production of OH, O and H radicals. Besides the reaction of CH 3 radical with NO 2 enhances NO reduction at lower temperature when CH 4 additive is used.
ISSN:2151-7614
2151-7622
DOI:10.1109/ICBBE.2008.509