燃煤电厂SCR催化剂失活机制及应对措施  

Deactivation Mechanism and Countermeasures of SCR Catalysts in Coal-Fired Power Plants

作　　者：于沛东 李智华 孙利 王俊俊 武秀龙 Yu Peidong;Li Zhihua;Sun Li;Wang Junjun;Wu Xiulong(Inner Mongolia Daihai Power Generation Co.,Ltd.,Liangcheng Inner Mongolia 013700,China;Beijing New Leaf Technology Co.,Ltd.,Beijing 100080,China)

机构地区：[1]内蒙古岱海发电有限责任公司,内蒙古凉城013700 [2]北京新叶科技有限公司,北京100080

出　　处：《山西化工》2025年第3期151-153,169,共4页Shanxi Chemical Industry

摘　　要：选择性催化还原法脱硝(SCR)技术,SCR催化剂活性对系统性能起决定作用。但是,在高尘布置下,烟气中的粉尘、重金属、碱(土)金属及高温条件将对催化剂活性产生不利影响,使得实际工程中催化剂失活现象时有发生。研究表明:重金属和碱(土)金属存在时将减少和削弱催化剂表面酸性位,从而使催化剂活性下降;高温烧结,将改变TiO_(2)粒径和孔道结构,从而导致活性下降;磨损和堵塞引起的载体结构改变,也是诱发催化剂活性下降的重要原因。在工程应用中,通过采用负载型复合催化剂、选用合适的载体结构和提升系统抗积灰性能可以减缓催化剂失活现象;当发现催化剂失活时,可以通过再生措施,提升催化剂的活性。The Selective Catalytic Reduction(SCR)technology for denitrification relies heavily on the activity of SCR catalysts,which is crucial to system performance.However,under high-dust conditions,the dust,heavy metals,alkali(earth)metals,and high-temperature environment in the flue gas can adversely affect the catalyst activity,leading to frequent deactivation of the catalysts in practical engineering applications.Research indicates that the presence of heavy metals and alkali(earth)metals reduces and weakens the acidic sites on the catalyst surface,resulting in decreased catalyst activity.High-temperature sintering alters the TiO_(2) particle size and pore structure,which also leads to decreased activity.Additionally,changes in the carrier structure due to abrasion and blockage are significant factors inducing catalyst activity reduction.In engineering applications,using supported composite catalysts,selecting appropriate carrier structures,and enhancing the system's resistance to ash accumulation can mitigate catalyst deactivation.When catalyst deactivation is detected,regeneration measures can be implemented to restore catalyst activity.

关 键 词：SCR技术 催化剂 活性 再生 

分 类 号：X701[环境科学与工程—环境工程]