摘要
在燃煤烟气中选择性催化还原(SCR)技术由于脱硝效率高、选择性好被广泛应用,然而SCR催化剂的催化作用会使烟气中的SO2氧化成SO_(3),SO_(3)会与NH3等反应生成硫酸氢铵(ABS)和硫酸铵(AS),当烟气温度低于硫酸铵盐的凝结温度时,其会沉积在催化剂、空预器及其附属设备上,引发诸多严重的问题,对电厂的运行和环境造成了不利影响。本文综述了燃煤烟气中SO_(3)与硫酸氢铵的生成特性及其控制方法最新进展,分析了SO_(3)在锅炉和SCR系统中的形成机理、迁徙转化特性,阐述了控制SO_(3)与硫酸氢铵生成的方法,介绍了不同活性组分对催化剂表面SO_(3)和硫酸氢铵生成的影响。最后提出了开发新型催化剂是燃煤烟气中SO_(3)与硫酸氢铵生成控制的重点研究方向。
SCR technology is widely used in treating coal-fired flue gas due to its high denitrification efficiency and good selectivity.However,SCR catalyst will oxidize the SO_(2) in flue gas to SO_(3),which will subsequently react with NH3 to generate ammonium bisulfate(ABS)and ammonium sulfate(AS).When the flue gas temperature is lower than the precipitation temperature of ammonium sulfate,it will deposit on the catalyst,air preheater and other attached equipment,which has caused many serious problems and brought a negative impact on the operation and environment of power plant.In this paper,the characteristics and control methods of SO_(3) and ammonium bisulfate formation in coal-fired flue gas are reviewed.The formation mechanism and migration transformation characteristics of SO_(3) in boiler and SCR system are analyzed.The effects of different active components on the generation of SO_(3) and ammonium bisulfate on catalyst’s surface are introduced.Finally,it is proposed that the development of new catalysts is the key research direction for the control of SO_(3) and ammonium bisulfate formation in coal-fired flue gas.
作者
尹子骏
苏胜
王中辉
王乐乐
安晓雪
赵志刚
陈逸峰
刘涛
汪一
胡松
向军
YIN Zijun;SU Sheng;WANG Zhonghui;WANG Lele;AN Xiaoxue;ZHAO Zhigang;CHEN Yifeng;LIU Tao;WANG Yi;HU Song;XIANG Jun(State Key Laboratory of Coal Combustion,Huazhong University of Science&Technology,Wuhan 430074,Hubei,China;Xi’an Thermal Power Research Institute Company Limited,Suzhou Branch,Suzhou 215153,Jiangsu,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2021年第4期2328-2337,共10页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(51976072,U20A20302)。
关键词
三氧化硫
氮氧化物
选择性催化还原催化剂
硫酸氢铵
sulfur trioxide
nitrogen oxide
selective catalytic reduction catalyst
ammonium hydrogen sulfate
