NH3对SCR催化剂Hg^0催化氧化性能的影响  

Influence of NH3 on Hg^0 Oxidation Performance of SCR Catalyst

作　　者：翁麒宇 李端乐 禚玉群[1] WENG Qiyu;LI Duanle;ZHUO Yuqun(Key Laboratory of Thermal Science and Power Engineering of Ministry of Education(Department of Energy and Power Engineering,Tsinghua University),Haidian District,Beijing 100084,China)

机构地区：[1]热科学与动力工程教育部重点实验室(清华大学能源与动力工程系),北京市海淀区100084

出　　处：《发电技术》2020年第5期471-479,共9页Power Generation Technology

基　　金：国家重点研发计划项目(2016YFB0600603)。

摘　　要：作为我国主要的汞污染源之一,燃煤电厂汞污染物排放控制是我国环保标准的要求。通过改性SCR催化剂和卤化物添加等方法将Hg^0氧化为Hg^2+,进而通过后续设备进行脱除,是提高汞脱除率的有效方法。但对我国而言,这类结合现有环保设备的联合脱除方法都面临着SCR入口高浓度NH3的抑制作用。为此,基于文献调研,总结了NH3对SCR催化剂Hg^0氧化性能的影响,以及卤素存在条件下NH3对Hg^0氧化性能的影响,分析了改性催化剂及卤化物添加对Hg^0氧化率的提高机理,进而对应地分析了NH3对Hg^0氧化的抑制机理。研究结果为实际燃煤电厂提高SCR设备Hg^0氧化率提供了参考。As one of the main sources of mercury pollution in China,the emission control of mercury pollutants from coal-fired power plants is the requirement of China’s environmental protection standards.Hg^0 is oxidized to Hg^2+by means of modified SCR catalyst and halide addition in coal,and then removed by subsequent equipment,which are effective methods to improve mercury removal rate.For these methods based on air pollution control device(APCD)in China,the inhibition of high concentration NH3 at SCR inlet is a problem to solve.Therefore,based on literature research,the influence of ammonia injection on Hg^0 oxidation performance under the combined effect of SCR catalyst and halide addition in coal was concluded.The mechanism of improving Hg^0 oxidation rate by modified catalyst and halide addition was analyzed.The corresponding inhibition mechanism of NH3 on Hg^0 oxidation was also analyzed.The research results provide a reference for the coal-fired power plants to improve Hg^0 oxidation rate of SCR.

关 键 词：燃煤电厂 Hg^0氧化 SCR催化剂 卤化物 

分 类 号：TK09[动力工程及工程热物理]