燃煤电厂商用SCR脱硝催化剂的失活机理及再生  

DEACTIVATION MECHANISM AND REGENERATION OF COMMERCIAL SCR DENITRATION CATALYSTS IN A COAL-FIRED POWER PLANT

作　　者：王夫美[1,2] 白鹏飞 王志 沈伯雄 王凯[3] WANG Fu-mei;BAI Peng-fei;WANG Zhi;SHEN Bo-xiong;WANG Kai(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Key Laboratory of Cleaner Energy Utilization and Pollution Control of Tianjin,Tianjin 300401,China;Suzhou Xire Energy Saving&Environmental Protection Co.,Ltd,Suzhou 215153,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]天津市清洁能源利用与污染物控制重点实验室,天津300401 [3]苏州西热节能环保技术有限公司,苏州215153

出　　处：《环境工程》2019年第6期16-21,共6页Environmental Engineering

基　　金：国家重点研发计划“烟气污染防治技术集成及产业化”(2016YFC0209202);天津市生态治理重大专项(18ZXSZSF00040)

摘　　要：对燃煤电站运行3年的失活脱硝催化剂进行失活机理分析和再生研究。失活机理研究表明:飞灰磨蚀和堵塞,以及碱金属K和Na中毒是该燃煤电站催化剂失活的主要原因;其次,少量硫酸盐在催化剂表面沉积降低其活性。分别采用水洗再生、硫酸酸洗再生和钒活性液浸渍再生工艺处理,结果表明:水洗再生脱硝活性可提升12%左右,酸洗再生可提升20%左右。采用多次浸渍法对预处理失活催化剂进行钒活性液浸渍再生,脱硝效率进一步提升,最高脱硝率达到99%。The deactivation mechanism analysis and regeneration research were conducted for the deactivated denitration catalysts running for 3 years in a coal-fired power plant. The results showed that: fly ash deposition and blocking, as well as alkali metal K and Na poisoning were main causes for catalyst deactivation of this coal-fired power plant;deposition of sulfate in a small quantity on the catalyst surface caused the reduction of activity. The regeneration technologies including water washing regeneration, acid washing regeneration and vanadium active component re-impregnated regeneration process were also investigated. The results showed that, denitration activity could be increased by about 12% after water washing regeneration, while by about 20% after acid washing regeneration. When the poisoned catalysts without pre-treatment were impregnated in vanadium active component, the NO conversion declined instead. Pretreated deactivated catalysts were impregnated with vanadium active liquid through multiple impregnation, and the denitration efficiency was improved further, with the maximum value up to 99%.

关 键 词：燃煤电站 烟气脱硝 商业SCR催化剂 失活机理 再生 

分 类 号：TQ426[化学工程] X773[环境科学与工程—环境工程]