SCR蜂窝状脱硝催化剂磨损数值模拟研究

摘要

Catalyst erosion is one of the most important influence factors of SCR catalyst failure. Adopts computational fluid dynamic methods to simulates the erosion at the catalyst front and pore wall,and dis-cuss the catalyst pore size,layer spacing,pore blockage effect on catalyst erosion. The investigation shows that the catalyst pore size has little effect on the catalyst front erosion rate but is inversely proportional to pore wall erosion rate;when catalysts is multilayer arrangement,the second layer catalyst front erosion rate is increased with the layer space increasing at first,then remains unchanged,while the pore wall erosion rate is decreased at first then remains unchanged;When the catalyst pore clogging,outer wall erosion rate around plugging hole is intensified,causing the whole catalyst rate increased,while the catalyst front ero-sion rate changed little;so,it should avoid catalyst blocking in the actual engineering operation.%催化剂磨损是引起SCR催化剂失效的主要原因之一。基于计算流体力学软件对催化剂端面和孔壁磨损进行数值模拟研究，讨论了催化剂孔径大小、多层布置间距、孔道堵塞对催化剂磨损的影响。结果表明，催化剂孔径大小对催化剂端面磨损率影响不大，与孔壁磨损率呈反比；催化剂多层布置时，第二层催化剂的端面磨损率随布置间距的增加先增加后保持不变，而孔壁磨损率先减小后维持不变；当催化剂孔道堵塞时，堵塞孔附近孔的外壁面磨损加剧，导致孔壁磨损率明显增加，而端面磨损率变化不大，因此在工程实际运行中，应避免催化剂的堵塞。