Title: Experimental Study of Selective Non-catalytic Reduction of NO_xby NH_3in Flue Gas Containing SO_2
Abstract: Selective non-catalytic reduction of NOxby NH3 in flue gas containing high concentration of SO2 was studied.Experiments in a fixed bed reactor showed the effects of temperature(775-975 ℃),molar ratio of NH3 to NOx(0.9-3.0),O2 concentration(5%-21%),SO2 concentration(0-0.022%),and residence time(7.9-23.6 s) on denitrification efficiency.The results show that the NOx conversion in flue gas with and without SO2increases gradually with the rise of temperature.The denitrification efficiency improves significantly when SO2 is added to the flue gas,and the emission of NH3 is low because of the formation of ammonium sulfate by reaction between the remaining NH3 and SO2.The denitrification efficiency improves rapidly with the increase of the molar ratio of ammonia to nitrogen oxide([NH3]/[NOx]) when [NH3]/[NOx] is below 1.6.The emission of NH3 increases rapidly with the increase of NH3/NOx when NH3/NOx exceeds 2.4.With the increase of the O2 concentration,the conversion of NOx is gradually reduced,and the efficiency of denitrification is stabilized when the O2 concentration exceeds 10%.The presence of SO2 promotes the reaction of NH3 selective reduction of NOx at 900 ℃.The denitrification efficiency decreases when the residence time of SO2 exceeds 9.4 s,this may be due to the faster SNCR reaction rate and the easier NH3 oxidation reaction under the conditions of high temperature and enriched oxygen.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
Access and Citation
AI Researcher Chatbot
Get quick answers to your questions about the article from our AI researcher chatbot