燃煤电厂砷中毒SCR脱硝催化剂的失活特性研究  

Research on the deactivation of arsenic poisoned SCR De-NO_x catalyst in coal-fired power plants

作　　者：朱春华 陆强[2] 庄柯[1] 曲艳超 崔敏姝 ZHU Chun-hua;LU Qiang;ZHUANG Ke;QU Yan-chao;CUI Min-shu(State Power Environmental Protection Research Institute,Nanjing 210031,China;National Engineering Laboratory-for Biomass Power Generation Equipment,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国电环境保护研究院,江苏南京210031 [2]华北电力大学生物质发电成套设备国家工程实验室,北京102206

出　　处：《应用化工》2018年第6期1145-1149,1161,共6页Applied Chemical Industry

基　　金：国家973计划(2015CB251501);北京市科技新星(Z171100001117064);国家环境保护大气物理模拟与污染控制重点实验室开放基金课题

摘　　要：分别对某燃煤电厂运行了3个月和3年的SCR脱硝催化剂进行活性测试,并结合X射线原子荧光(XRF)、氢气程序升温还原(H_2-TPR)、比表面积(BET)和X射线光电子能谱(XPS)等对催化剂进行分析,探究SCR脱硝催化剂的砷中毒失活特性。结果表明,在富砷煤的使用条件下,电厂运行3个月和3年的催化剂都已发生严重失活,活性下降主要是由砷中毒引起,而且主要发生在催化剂表层,其中运行3个月催化剂活性下降主要由砷的物理中毒引起的,而对于运行3年的催化剂,由砷引起的物理中毒和化学中毒共同导致催化剂脱硝效率下降。SCR De-NOx catalysts used for three months and three years were selected to investigate the arsenic poisoning problem of SCR catalyst caused by utilization of arsenic rich coal in coal-fired power plants. Catalysts denitration activities were detected,and characterizations including X-ray fluorescence（XRF）,H2-temperature programmed reduction（ H2-TPR）,specific surface area（ BET） and X-ray photoelectron spectroscopy（ XPS） were conducted to explore the deactivation characteristics of arsenic poisoned SCR De-NOx catalysts. Results showed that,under the operating condition of arsenic rich coal,catalysts utilized for both three months and three years were seriously deactivated by arsenic poisoning. The arsenic poisoning was mainly occurred at catalysts surface,while the inside catalysts still maintained high activity.From the results of microstructural characterizations,it can be concluded that deactivation of catalysts used for three months was caused by physical poisoning of arsenic,while combined physical and chemical poisoning of arsenic led to the deactivation of catalysts used for three years.

关 键 词：SCR 催化剂 砷中毒 活性 

分 类 号：TQ032.4[化学工程]