SCR整流格栅高度与催化剂安装耦合影响分析  

Analysis of Coupling Effect between the Height of SCR Rectifier Grid and the Catalyst Installation Height

作　　者：高建强[1] 梁胜莹 危日光[1] GAO Jianqiang;LIANG Shengying;WEI Riguang(School of Energy Power and Mechanical Engineering,North China Electric Power University, Baoding 071003,China)

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《中国电力》2019年第4期144-150,共7页Electric Power

基　　金：国家科技支撑计划资助项目(2015BAA03B01)~~

摘　　要：选择性催化还原(SCR)脱硝反应器内均匀的流场、浓度场是保证脱硝效率的前提,以某1000MW燃煤机组SCR脱硝反应器为研究对象,对其结构进行了深入研究。通过模拟确定最佳整流格栅间距及髙度,继而模拟整流格栅高度与首层催化剂安装高度的比值(c)对首层催化剂流场、浓度场均匀性的耦合影响,并通过实验予以验证。结果表明:格栅间距不宜过大或过小,整流格栅之间的距离0.2m左右为宜;随c值增大,首层催化剂的速度偏差增大,当c大于一定数值后,不同格栅高度下的速度偏差都会突增;格栅高度〇.8m时,对整流格栅与首层催化剂之间的距离要求最低,c值可放宽到0.8左右。The uniform flow field and concentration field in the SCR reactor are essential to achieving high denitrification efficiency. In this paper, by taking the SCR denitration reactor of a 1 000 MW coal-fired unit as the research object, its structure is thoroughly studied. The optimal spacing and height of rectifying grille are then determined from digital simulation, and the coupling effect of the ratio of rectifying grille height to the installation height of the first catalyst layer (denoted as c) on the flow field and concentration field uniformity is further simulated and verified through a series of experiment. The results show that the grid spacing should not be too large or too small, which is recommended at around 0.2 m. When the value of c increases, the velocity deviation of the first layer catalyst will increase. When the value of c is greater than certain threshold, the velocity deviations will jump sharply at all different grid heights. Particularly with the grid height at 0.8 m, the distance between the rectifying grille and the first layer catalyst can be increased correspondingly, and the value of c can be relaxed to 0.8.

关 键 词：锅炉 选择性催化还原(SCR) 整流格栅 首层催化剂安装高度 格栅间距 

分 类 号：TK227[动力工程及工程热物理—动力机械及工程] TM621.9[电气工程—电力系统及自动化]