Modeling NO and SO2 Oxidation by H2O2 in Coal-Fired Flue Gas

Abstract

NO and SO2 oxidization by H2O2 in coal-fired flue gas was modeled, and the effects of temperature and H2O2 concentration on NO and SO2 oxidization were investigated. The pathways of NO and SO2 oxidization were as follows: H2O2→OH→HO2+NO→NO2 and SO2+OH→HOSO2+O2→SO3, respectively. There were optimal temperature ranges of NO and SO2 oxidization, and the ranges were 65–92 K and 65–75 K, respectively. In the optimal temperature ranges, the NO2 conversion rate was greater than .9 at MRH2O2/NO>1.9, and the SO3 conversion rate reached about .3 at MRH2O2/SO2=.1–.4. SO2 oxidization could promote HO2 formation to oxidize NO.