选择性非催化还原反应的实验研究与机理分析  

Experimental Study and Mechanism Analysis on Selective Non-Catalytic Reduction Reactions

作　　者：吕洪坤[1] 杨卫娟[2] 周俊虎[2] 岑可法[2] 张明[1] 李凤瑞[1] 

机构地区：[1]浙江省电力试验研究院 [2]浙江大学能源清洁利用国家重点实验室

出　　处：《电站系统工程》2011年第2期4-7,共4页Power System Engineering

基　　金：国家杰出青年科学基金(50525620);国家重点基础研究发展计划资助(2006CB200303)

摘　　要：在一管式石英反应器上研究了温度、氨氮比R、NOx初始体积浓度等反应参数对氨水选择性非催化还原(SNCR)反应的影响并采用CHEMKIN软件进行了机理分析。结果表明:①最佳脱硝温度约在920～950℃左右,N2O排放则在低于最佳脱硝温度时达到最大值,升高温度可以降低尾部的NH3泄漏;②增加氨氮比可以提高脱硝效率但会增加尾部的NH3泄漏与N2O排放;③氧气体积浓度的增加提高了低温下的脱硝效率却降低了高温下的脱硝效率,同时也降低了尾部的NH3泄漏、增加了低温区域的尾部N2O排放;④脱硝效率随着NOx初始体积浓度的升高,而有所提高而完成SNCR反应所需的停留时间(τf)则随着反应温度的升高而缩短,在最佳脱硝温度附近τf约为0.4～0.8 s左右。Experimental study on the influences of reaction parameters,such as temperature,ratio of ammonia to nitrogen in the feed（R）,and initial NOx volume concentration,etc,on Selective Non-Catalytic Reduction（SNCR） using ammonia solution was carried out in a quartz tube reactor and it＇s reaction mechanism was analyzed by CHEMKIN soft.The results showed： The optimum DeNOx temperature was about 920 to 950 ℃,N2O emission peak was reached at some temperature lower than the optimum DeNOx temperature and increasing temperature could reduce NH3 slip;the increase of R could improve the DeNOx efficiency,but also with the increase of NH3 slip and N2O emission;the increase of O2 volume concentration improved the DeNOx efficiency in low temperature region but lowered the DeNOx efficiency in high temperature region,and also reduced NH3 slip,increased N2O emission in low temperature region;the DeNOx efficiency was improved and the residence time needed for finishing the SNCR reactions（τf） was shortened as the initial NOx volume concentration rised,and τf was about 0.4 to 0.8 second around the optimum DeNOx temperature.

关 键 词：选择性非催化还原 NOx NH3 N2O 

分 类 号：X511[环境科学与工程—环境工程]