SCR烟气脱硝喷氨优化改造研究  

Study on Optimization and Transformation of Ammonia Injection during Flue Gas Denitration Process under SCR Condition

作　　者：周雷 杨祖旺 金立梅 周静[3] 谭厚章[3] ZHOU Lei;YANG Zu-wang;JIN Li-mei;ZHOU Jing;TAN Hou-zhang(Huadian Ningxia Lingwu Power Generation Co.,Ltd.,Yinchuan 751400,China;Xi’an Grey Power Technology Co.,Ltd.,Xi’an 710043,China;Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]华电宁夏灵武发电有限公司,银川751400 [2]西安格瑞电力科技有限公司,西安710043 [3]西安交通大学,西安710049

出　　处：《应用能源技术》2020年第11期31-36,共6页Applied Energy Technology

摘　　要：某公司#3炉SCR入口截面NOx/NH3混合不均匀,造成喷氨量增大、氨逃逸率增大、空预器堵塞严重、脱硝效率下降。为解决上述问题,现提出在SCR系统喷氨格栅后加装氨-烟混态扰流器。加装氨-烟混态扰流器后,SCR入口烟道烟气流速相对标准偏差CV由16.8%下降至6.6%,SCR出口NOx标准偏差由35.6%下降为6.2%。在850 MW工况下,喷氨量下降37.09%,流场分布明显改善,氨逃逸率下降95.4%,空预器阻力大大降低。The NOx/NH3 at the denitrification inlet section in#3 furnace of a company is nonuniform,which resulted in the increase of ammonia injection volume and ammonia escape rate,serious blockage of air preheater and decrease of denitration efficiency.To solve the above problems,an ammonia-smoke mixed spoiler is proposed to be installed after the ammonia injection grid in the SCR system.After transformation,the relative standard deviation(CV)of flue gas velocity at the inlet of SCR decreased from 16.8%to 6.6%,and the standard deviation of NOx at the outlet of SCR decreased from 35.6%to 6.2%.Under 850 MW load,the ammonia injection volume decreased by 37.09%,and the distribution of flow field was significantly improved.Ammonia escape rate was reduced by 95.4%,and the resistance of air preheater was greatly reduced.

关 键 词：SCR 扰流器 氨逃逸 氨氮比 

分 类 号：X701[环境科学与工程—环境工程]