积灰坍塌对催化剂堵塞问题影响实验研究  

Experimental Study on the Effect of Deposited Ash Collapse on Catalyst Blockage

作　　者：邓淮铭 陈鸿伟[1] 赵超[1] 朱栋琦 赵宝宁[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003

出　　处：《电力科学与工程》2017年第6期55-59,共5页Electric Power Science and Engineering

摘　　要：为探索选择性催化还原(SCR)烟气脱硝系统催化剂上方的整流格栅积灰突然坍塌对SCR催化剂堵塞的影响,采用有机玻璃搭建小型冷态试验台模拟整流格栅部位积灰坍塌的情形进行相关实验研究。实验结果表明:用原灰进行实验时,蜂窝式催化剂最多有5%的孔被堵塞,且通风与否对其堵塞有很大影响;当原灰中按一定比例混入大颗粒灰时,随着下料量的增加,催化剂孔堵塞数目呈线性上升的趋势。当下料量达到10 kg时,催化剂最多有15%的孔被堵塞,且通风与否对其影响不大。锅炉实际运行过程中产生的大颗粒灰,会对催化剂堵塞影响严重。在此基础上提出在省煤器与SCR催化剂层间烟道内加装拦截网,对大颗粒灰进行预脱除的建议,以期对电厂安全运行提供参考。In order to explore the effect of the deposited ash collapse from the rectifying grids located above the catalyst of selective catalytic reduction（ SCR） denitration system on the catalyst blockage,a small cold test rig made of organic glass was used to simulate the behavior of experiment conditions. The experimental results showed that the amount of honeycomb catalyst grids blockage may reach up to 5% when the original ash was used,and the blockage was significantly influenced by ventilating or not. The amount of catalyst grids blockage increased linearly with the increase of the ash feeding amount as a ratio of big particle ash was mixed in the original ash. The amount of catalyst blockage may reach up to 15% when the ash feeding amount was 10 kg,and there was no influence on the blockage whatever ventilating or not. Therefore,the big particle ash produced from the process of boiler operation has a great effect on the catalyst blockage. Based on the experimental results above,the suggestion of installing the intercept net between economizer and catalyst to remove big particle ash was proposed to provide a reference for the safe operation of the power plant.

关 键 词：烟气脱硝 选择性催化还原 粉尘颗粒 催化剂堵塞 积灰坍塌 大颗粒灰 

分 类 号：X773[环境科学与工程—环境工程]