摘要
选择性催化还原(SCR)技术由于脱硝效率高、选择性好而被广泛应用于烟气氮氧化物排放控制;然而,目前广泛采用的钒钛系SCR脱硝催化剂会使烟气中SO_(2)氧化成SO_(3),烟气中过高的SO_(3)对电厂安全运行会造成严重影响,也会对环境造成污染。以典型V2O5-WO_(3)/TiO_(2)催化剂为研究对象,系统研究了SCR脱硝过程中烟气流量、温度、O_(2)浓度、SO_(2)浓度等对催化剂表面SO_(3)生成特性的影响,并进一步对SO_(3)生成的反应动力学特性进行了分析。研究表明:催化剂表面SO_(3)生成反应中SO_(2)的反应级数为0.59,当O_(2)浓度大于3%时,O_(2)的反应级数为0,该反应的表观活化能为70.39 kJ/mol;实验条件下,烟气中SO_(2)浓度增加会使SO_(3)生成的反应速率提高;O_(2)浓度对催化剂表面SO_(3)生成影响并不显著;烟气温度对催化剂表面SO_(3)生成具有显著影响,高温会促进SO_(3)的生成。
Selective catalytic reduction(SCR)technology is widely used in flue gas nitrogen oxide emission control due to its high denitration efficiency and good selectivity;however,currently widely used vanadium titanium SCR catalyst can oxidize SO_(2) in flue gas into SO_(3),and excessive SO_(3) in flue gas will cause serious impact on the safe operation of power plant and also cause environmental pollution.Taking commercial V2O5-WO_(3)/TiO_(2) catalyst as the research object,the effects of flue gas flowrate,temperature,O_(2) concentration and SO_(2) concentration on the formation of SO_(3) on the catalyst during SCR denitrification were systematically studied,and the reaction kinetics of SO_(3) formation was further discussed.The results show that the reaction order of SO_(2) is 0.59.When the concentration of O_(2) is more than 3%,the reaction order of O_(2) is 0,and the activation energy of SO_(3) formation on catalyst is 70.39 kJ/mol.The increase of SO_(2) concentration will increase the reaction rate of SO_(3) formation;O_(2) concentration has no significant effect on the formation of SO_(3) on the catalyst.The temperature of flue gas has a significant effect on the formation of SO_(3),and high temperature can promote the formation of SO_(3).
作者
尹子骏
苏胜
卿梦霞
赵志刚
王中辉
王乐乐
江龙
汪一
胡松
向军
YIN Zijun;SU Sheng;QING Mengxia;ZHAO Zhigang;WANG Zhonghui;WANG Lele;JIANG Long;WANG Yi;HU Song;XIANG Jun(State Key Laboratory of Coal Combustion,Huazhong University of Science&Technology,Wuhan 430074,Hubei,China;School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China;Xi’an Thermal Power Research Institute Company Limited,Suzhou Branch,Suzhou 215153,Jiangsu,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第5期2596-2603,共8页
CIESC Journal
基金
国家自然科学基金项目(51976072,U20A20302)。
