SCR反应器入口速度与氨分布不均匀性对脱硝性能的影响

发布时间：2018-01-26 12:18

本文关键词： 氮氧化物选择性催化还原脱硝氨逃逸不均匀分布入口速度　出处：《中国电机工程学报》2017年09期 　论文类型：期刊论文

【摘要】：选择性催化还原(selective catalytic reduction,SCR)反应器入口参数的不均匀分布会影响其脱硝性能。文中首先建立了SCR催化剂模块单通道内流动传质与反应模型,通过数值模拟获得了各种参数条件下单通道的脱硝性能;在此基础上研究了多通道催化剂床层入口速度和氨的不均匀分布对SCR脱硝性能的影响。研究表明:入口速度和还原剂的不均匀分布会增加反应器出口的氮氧化物浓度与氨逃逸;不同分布形态对脱硝性能的影响有差异;随分布相对偏差的增加,脱硝效率降低、氨逃逸增加,氨分布偏差的影响最为重要;降低空速和提高氨氮比均能增加脱硝效率,但提高氨氮比同时也会造成更多的氨逃逸。在此基础上提出了满足NO_x超低排放需求的入口速度和还原剂分布相对偏差限值设定方法。
[Abstract]:Selective catalytic reduction of selective catalytic reduction. The non-uniform distribution of inlet parameters will affect the denitrification performance of SCR reactor. Firstly, a model of mass transfer and reaction in single channel of SCR catalyst module is established. Through numerical simulation, the denitrification performance of the order channel with various parameter conditions is obtained. On this basis, the effects of the inlet velocity of multi-channel catalyst bed and the uneven distribution of ammonia on the denitrification performance of SCR were studied. The inlet velocity and the uneven distribution of reductant will increase the nitrogen oxide concentration and ammonia escape at the outlet of the reactor. The effect of different distribution forms on denitrification performance is different. With the increase of relative deviation of distribution, denitrification efficiency decreases, ammonia escape increases, and the effect of deviation of ammonia distribution is the most important. Reducing the air velocity and increasing the ratio of ammonia to nitrogen can increase the denitrification efficiency. However, increasing the ratio of ammonia to nitrogen will also lead to more ammonia escape. On the basis of this, the method of setting the inlet speed and relative deviation limit of reducing agent distribution to meet the demand of ultra-low emission of NO_x is proposed.
【作者单位】：清华大学热科学与动力工程教育部重点实验室;
【基金】：国家科技支撑计划项目(2015BAA05B01)~~
【分类号】：X773
【正文快照】： 布对SCR脱硝性能的影响。研究表明:入口速度和还原剂的不均匀分布会增加反应器出口的氮氧化物浓度与氨逃逸;不同分布形态对脱硝性能的影响有差异;随分布相对偏差的增加,脱硝效率降低、氨逃逸增加,氨分布偏差的影响最为重要;降低空速和提高氨氮比均能增加脱硝效率,但提高氨氮比

【相似文献】