典型燃煤电厂SCR脱硝系统超低排放运行优化  

Operation optimization for SCR denitration system in ultra low emission situation for typical coal-fired power plants

作　　者：王乐乐[1] 杨敏 吴善森 黄春艳 张庆文 朱磊 姚燕[1] 何金亮[1] 孔凡海[1] 向军[3] WANG Lele;YANG Min;WU Shansen;HUANG Chunyan;ZHANG Qingwen;ZHU Lei;YAO Yan;HE Jinliang;KONG Fanhai;XIANG Jun(Xi’an Thermal Power Research Institute Co.,Ltd.Suzhou Branch,Suzhou 215153,China;Huaneng Shanghai Shidongkou No.2 Power Plant,Shanghai 200942,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]西安热工研究院有限公司苏州分公司,江苏苏州215153 [2]华能上海石洞口第二电厂,上海200942 [3]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《热力发电》2020年第9期156-162,共7页Thermal Power Generation

基　　金：中国华能集团有限公司总部科技项目(HNKJ18-G06);国家自然科学基金面上项目(51976072)。

摘　　要：本文以某超超临界660 MW燃煤机组选择性催化还原(SCR)脱硝系统为研究对象,针对其在超低排放运行中出现的问题,进行了系统诊断分析,并采取了一系列脱硝性能提效和运行优化集成措施。最终实现了脱硝出口NOx波动幅度控制在±10 mg/m^3以内,降低出口截面上平均NOx分布相对标准偏差至20%以内,并通过初装催化剂再生提效的方法控制现场平均氨逃逸量在0.5μL/L以下,有效消除了脱硝出口截面上氨逃逸量局部过高现象,为机组安全经济运行和NOx深度减排创造了条件。By taking the selective catalytic reduction(SCR)denitration system of an ultra-supercritical 660 MW coal-fired unit as the research object,this article systematically diagnoses the problems occurred during the unit ultra-low emission operation.Moreover,a series of measures have been taken to improve the denitrification performance and optimize the SCR operation.Finally,the fluctuation range of the NOx concentration at outlet of the denitration system was controlled within±10 mg/m^3,and the relative standard deviation of the average NOx distribution on the outlet cross section was reduced to less than 20%.By regeneration of the initially installed catalysts,the average ammonia escape concentration on site was controlled below 0.5μL/L,which effectively eliminated the phenomenon of locally high ammonia escape concentration on the cross section of the denitration outlet,and created conditions for safe operation of the unit and further deep reduction of NOx.

关 键 词：燃煤电厂 超低排放 SCR 脱硝系统 运行优化 NOx分布 氨逃逸量 

分 类 号：X511[环境科学与工程—环境工程]