烟气飞灰对SCR脱硝催化剂的磨损性能试验研究

Experimental Study on Wear Resistance of SCR Denitration Catalyst to Flue Gas Fly Ash

利用自制的冷态飞灰磨损试验台,进行了飞灰对SCR脱硝催化剂磨损性能影响的试验研究。结果表明:催化剂磨损主要发生在端面,烟气流速是催化剂磨损的主要因素,催化剂磨损率以速度指数基本为4的规律变化,且速度指数随飞灰粒径的增大而减小;飞灰粒径和飞灰质量浓度是催化剂磨损的次要因素,粒径指数在1附近变化,且随烟气流速的增大而减小,催化剂磨损率正比于飞灰质量浓度;在实际运行过程中,应尽可能保证流场均匀,避免局部高速,以减轻催化剂磨损,保证脱硝系统经济安全地运行。

Experimental studies were conducted on wear resistance of SCR denitration catalyst to flue gas fly ash in a self-developed cold-state test facility.Results show that the catalyst wear mainly happens on the end faces,which is primarily affected by the flue gas velocity,and the wear rate varies in the velocity index of 4,while the velocity index reduces with rising size of fly ash particles.The catalyst wear is secondarily influenced by both the size and concentration of fly ash particles,and the index of particle size is about 1,which reduces with rising flue gas velocity;the wear rate of catalyst is directly proportional to the concentration of fly ash.In actual operation,the flow field should be secured as far as possible to avoid local high speed,so as to reduce the attrition of catalyst,thus achieving economic and safety operation of the denitration system.