基于氨空混和技术的SCR脱硝系统氨耗量控制  

Control of SCR denitrification system based on ammonia air mixing technology

作　　者：许剑 尚桐[2] 刘斌 岳宏利 董浩 罗志[2] 黄钢英[2] XU Jian;SHANG Tong;LIU Bin;YUE Hongli;DONG Hao;LUO Zhi;HUANG Gangying(China Resources Power HoldingsCo.,Ltd.,Shenzhen 518000,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;China Resources Power (Tangshan Caofeidian) Co.,Ltd.,Tangshan 063000,China)

机构地区：[1]华润电力控股有限公司,广州深圳518000 [2]西安热工研究院有限公司,陕西西安710054 [3]华润电力(唐山曹妃甸)有限公司,河北唐山063000

出　　处：《热力发电》2019年第8期76-80,共5页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ17-H11)~~

摘　　要：为保证Nox排放值满足超低排放要求,许多燃煤机组选择性催化还原(SCR)脱硝系统存在还原剂加入过量的现象,这不仅会造成氨逃逸量超标增加运行成本,还影响到空气预热器、除尘器等后续设备的正常运行。为此,本文从氨空混合的角度出发,借助计算流体动力学(CFD)软件数值模拟,探究加装氨空混合器、优化母管联箱尺寸及采用流场分区混合对机组SCR脱硝系统氨耗量影响。在某300MW机组采用上述技术进行改造后,机组氨耗量降低约37.8%,每年节省液氨采购成本68.79万元,经济效果显著。To ensure a high de-nitration efficiency of selective catalytic reduction(SCR)system and keep NOxemission below regulation requirements,excessive reductants are used frequently in the SCR denitration system of a large number of coal-fired units,which will result in excessive ammonia escape,increase the operation cost,and bring a series of hidden troubles to the equipments downstream,such as air pre-heater and dust collector.Therefore,from the aspect of ammonia-air mixing and combining with the computational fluid dynamics simulation,the effects of installing ammonia-air mixer,optimizing pipe header size and adopting partition mixing on ammonia consumption of the SCR denitration system is discussed.The application of this technology on retrofitting of a 300 MW unit shows that,the ammonia consumption reduced by about 37.8%and the purchase cost of liquid ammonia can be saved by 68 790 000 yuan per year,indicating this technology has a significant economic effects.

关 键 词：SCR 脱硝系统 氨耗量 氨逃逸 氨空混合器 联箱 流场分区优化 

分 类 号：TK323[动力工程及工程热物理—热能工程]