基于性能检测的SCR脱硝催化剂寿命管理分析  

Analysis on life management of SCR denitrification catalyst based on performance test

作　　者：张志中 孙强 姜肇中 齐佶 陈琦 刘现伟 江建平 唐郭安 张杨 郭栋 ZHANG Zhizhong;SUN Qiang;JIANG Zhaozhong;QI Ji;CHEN Qi;LIU Xianwei;JIANG Jianping;TANG Guoan;ZHANG Yang;GUO Dong(Huadian Electric Power Research Institute Co.,LTD.,Hangzhou 310030,China;Huadian Xinjiang Hongyanchi Power Generation Co.,LTD.,Urumchi 830000,China;Xinjiang Huadian Kashi Thermal Power Co.,LTD.,Kashi 844000,China;Huadian Xinjiang Power Generation Co.,LTD.,Urumchi 830000,China)

机构地区：[1]华电电力科学研究院有限公司,浙江杭州310030 [2]华电新疆红雁池发电有限公司,新疆乌鲁木齐830000 [3]新疆华电喀什热电有限责任公司,新疆喀什844000 [4]华电新疆发电有限公司,新疆乌鲁木齐830000

出　　处：《电力科技与环保》2023年第1期59-70,共12页Electric Power Technology and Environmental Protection

基　　金：中国华电集团横向科技项目(CHDKJ21-02-154)。

摘　　要：燃煤电厂在完成烟气超低排放改造后,对SCR脱硝催化剂的质量、性能指标和寿命管理水平提出了更高的要求。基于某机组历年的催化剂性能检测结果,首先分析了催化剂的几何参数、机械性能参数、主要化学成分、微量元素、微观结构参数的变化趋势及催化剂运行中存在的问题和产生的原因,其次根据工艺特性检测结果分析催化剂不同运行阶段的活性衰减情况。结果表明,上层催化剂的As含量年平均增幅为166μg/g,中、下层催化剂的平均As含量年平均增幅为661μg/g,As增加使催化剂的比较面积和酸位点数量减少;上层催化剂平均比表面积降幅为17.5%,中、下层催化剂平均比表面积降幅为27.0%,比表面积的下降减少活性位点的数量;三层催化剂的整体活性由2016年的20.5 m/h下降至2019年的17.7 m/h,活性衰减导致喷氨量加大和氨逃逸增加。总结得出催化剂寿命管理的关键点:根据相关标准规范和技术要求正确选用催化剂;优化脱硝装置运行条件;采用合理的运行控制手段;密切跟踪催化剂的活性。结合催化剂性能检测结果的分析和对催化剂寿命管理关键点的总结,能够为火电厂脱硝催化剂的寿命管理提供有效借鉴。After the coal-fired power plants complete the transformation of flue gas ultra-low emission,it puts forward higher requirements of SCR denitrification catalysts on the quality,performance and life management level.Based on the catalyst performance test results of a unit over the years,the variation trend of the catalysts geometric parameters,mechanical parameters,main chemical components,trace elements,microstructure parameters,the problems existing in the operation of the catalysts and the causes were analyzed.It was found that the average annual increase of As content in the upper catalyst was 166μg/g,and the average annual increase of As content in the middle and lower catalysts was 661μg/g.As was able to reduce the comparison area of catalyst and the number of acid site.The average specific surface area of the upper catalyst decreased by 17.5%,and that of the middle and lower catalysts decreased by 27.0%.The decrease of specific surface area would reduce the number of active sites.Furthermore,the activity attenuation of catalysts in different running stages was analyzed according to the testing results of process characteristics and it was found that the overall activity of the three-layer catalyst decreased from 20.5m/h in 2016 to 17.7m/h in 2019.The activity attenuation would lead to the increase of ammonia ejection and ammonia escape.Finally,the key points of catalyst life management are summarized:selecting catalyst correctly according to the relevant standards;optimizing the operating conditions of denitration equipment;using reasonable operation control means;tracking the activity of catalyst closely.Combined the analysis on catalyst performance test results and key points summary of catalyst life management,it can provide effective reference for life management of denitrification catalysts in power plants.

关 键 词：燃煤电厂 SCR脱硝催化剂 性能检测 活性衰减 寿命管理 

分 类 号：X773[环境科学与工程—环境工程]