Experimental and Modeling Study on de-NO_x Characteristics of Selective Non-catalytic Reduction in O_2/CO_2 Atmosphere  

O_2/CO_2气氛下选择性非催化还原脱硝特性的实验与模拟研宄(英文)

作　　者：李辉 韩奎华 刘洪涛 路春美 

机构地区：[1]National Engineering Laboratory for Coal-fired Pollutants Emission Reduction.School of Energy and Power Engineering,Shandong University

出　　处：《Chinese Journal of Chemical Engineering》2014年第8期943-949,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51206096)

摘　　要：An experimental study of thermal de-NOx using NH3 as reductant in 02/C02 atmosphere with the effect of S02 and different additives was performed in a drop tube furnace. Results show that the optimum temperature win- dow is 841-1184 ℃, and the optimum reaction temperature is about 900 ℃ with a de-NOx efficiency of 95.4%. A certain amount of S02 has an inhibiting effect on NO reduction. The effect of additives, including Na2C03, C2H5OH and FeCI3, on NO reduction by NH3 is also explored. The addition of Na2CO3 and FeCI3 is useful to widen the tem- perature window and shift the reaction to lower temperature for the efficiency is increased from 30.5% to 74.0% and 67.4% respectively at 800 ℃. Qualitatively, the modeling results using a detailed kinetic modeling mecha- nism represent well most of the process features. The effect of Na2CO3, C2H5OH and FeCI3 addition can be reproduced well by the Na2C03, C2H5OH and Fe（CO）5 sub-mechanism respectively. The reaction mechanism analysis shows that the effects of these additives on NO reduction are achieved mainly by promoting the produc- tion of OH radicals at lower temperature.An experimental study of thermal de-NO_x using NH_3 as reductant in O_2/CO_2 atmosphere with the effect of SO_2and different additives was performed in a drop tube furnace.Results show that the optimum temperature window is 841-1184 ℃.and the optimum reaction temperature is about 900 ℃ with a de-NO,efficiency of 95.4%.A certain amount of SO_2 has an inhibiting effect on NO reduction.The effect of additives,including Na_2CO_3,C_2H_5OH and FeCl_3,on NO reduction by NH_3 is also explored.The addition of Na_2CO_3 and FeCl_3 is useful to widen the temperature window and shift the reaction to lower temperature for the efficiency is increased from 30.5%to 74.0%and 67.4%respectively at 800 ℃.Qualitatively,the modeling results using a detailed kinetic modeling mechanism represent well most of the process features.The effect of Na_2CO_3,C_2H_5OH and FeCl_3 addition can be reproduced well by the Na_2CO_3,C_2H_5OH and Fe(CO)_5 sub-mechanism respectively.The reaction mechanism analysis shows that the effects of these additives on NO reduction are achieved mainly by promoting the production of OH radicals at lower temperature.

关 键 词：Selective non-catalytic reduction DENITRIFICATION AMMONIA Kinetic modeling 02/CO2 SO2 ADDITIVES 

分 类 号：O643.131[理学—物理化学]