1000MW燃煤电厂商业SCR脱硝催化剂的失活  

Deactivation of commercial SCR catalyst used in 1000MW coal-fired power plant

作　　者：方拓拓 高尔豪 王亮[1,2] 许楠 王晓祥 何奕[1] 潘华[3] 施耀 FANG Tuo-tuo;GAO Er-hao;WANG Liang;XU Nan;WANG Xiao-xiang;HE Yi;PAN Hua;SHI Yao(Key Laboratory of Biomass Chemical Engineering of Ministry of Education,College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China;Zhejiang Zheneng Jiahua Power Plant Co.LTD.,Jiaxing 314200,China;College of Biological and Environment Engineering,Zhejiang Shuren University,Hangzhou 310015,China)

机构地区：[1]浙江大学化学工程与生物工程学院浙江大学生物质化工教育部重点实验室,浙江杭州310028 [2]浙江浙能嘉华发电有限公司,浙江嘉兴314200 [3]浙江树人大学生物与环境工程学院,浙江杭州310015

出　　处：《中国环境科学》2019年第2期583-590,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(21676245);国家重点研发计划项目(2018YFC020221)

摘　　要：以浙江某燃煤电厂1000MW商业SCR脱硝催化剂为研究对象,通过催化表征和活性评价综合分析该电厂1000MW商业SCR脱硝催化剂的失活原因.研究表明,催化剂的失活是多种因素共同作用的结果,(1)Fe,S,K和As元素中毒,其元素含量较新鲜催化剂分别增加了318.0%,233.3%,199.3%和99.8%;(2)催化剂表面孔道的飞灰堵塞,硫酸盐类沉积以及长时间高温反应造成催化剂的烧结和颗粒物的团聚,导致失活SCR脱硝催化剂比表面积较新鲜催化剂下降了20.3%;(3)活性组分V的价态变化造成V^(4+)/V^(5+)的比值由6.46下降至1.35,以及Lewis酸位点减少了34.2%,从而导致催化剂的失活.Fresh and used commercial SCR catalysts(40000hours)obtained from a 1000MW coal-fired plant in Zhejiang Province(China)were examined by catalyst characterization and De-NOx activity test to investigate the deactivation mechanism.The results showed that the deactivation of the catalyst wasattributed to different aspects.(1)Commercial SCR catalyst was poisoned by Fe,S,K and As.The content of Fe,S,K and As on deactivated catalyst increased by 318.0%,233.3%,199.3% and 99.8% compared with fresh catalyst,respectively.(2)Deposition of sulphate species and fly ash blocked the pores of SCR catalyst were blocked by Deposition of sulphate species and fly ash,resulting in the decrease of about 20.3% for surface area.(3)Valence of active component(vanadium)and Lewis acid site were changed during the process of deactivation.Compared with fresh catalyst,the V^4+/V^5+ ratio of deactivated catalyst fell from 6.46 to 1.35,as well as the reduction of 34.2% for Lewis acid site.

关 键 词：燃煤电厂 选择性催化还原 商业催化剂 失活 

分 类 号：X511[环境科学与工程—环境工程]