CALCULATION AND ANALYSIS OF INFLUENCE OF COAL GAS ON SELECTIVE NON-CATALYTIC REDUCTION OF NITRIC OXIDE BY AMMONIA
Coal gas was added to Selective Non-Catalytic Reduction(SNCR) process to change the temperature window for NO reduction. The effective composition of coal gas is the mixture of H2, CO and CH4 for SNCR process. Its influence on NO reduction and by-products emission was investigated through chemical kinetics calculation with detailed reaction mechanism. The results indicate that coal gas additive could shift the NO reduction temperature window to lower temperatures as much as 150K, and raise the maximum NO removal efficiency slightly. These effects are enhanced when the fraction of H2 in coal gas rises, and not affected by the initial NO concentration when the concentration ratio of coal gas additive and the initial NO keeps constant. Coal gas does not elevate NO2 emission, but it elevates N2O emission. Analysis through chemical kinetics mechanism indicates that coal gas affects NO reduction by promoting OH, O and H radicals production, and the critical reaction path is founded out.
Selective Non-Catalytic Reduction (SNCR) NO removal coal gas additive kinetics calculation
Qingxi CAO Shaohua WU Hui LIU Liping ZHAO Xia HUANG
Institute of Combustion Engineering, Harbin Institute of Technology,Harbin,China
国际会议
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
武汉
英文
379-383
2007-12-01（万方平台首次上网日期，不代表论文的发表时间）