Abstract: Selective Catalytic Reduction （SCR） is the most widely used and mature post-combustion denitration technology by far，but there are many problems in engineering practices.The ash particles in flue gas concentrating in tail flues near boiler side because of inertia can result in local wear and ash accumulation of SCR denitration catalyst，which dramatically reduces the efficiency of denitration units.A targeted optimization scheme was designed through analyzing the cause and mechanism of catalyst wear，in which the flow field in the flue was optimized by installing louver guide plates and ammonia-smoke mixed vortex generators.The feasibility of the scheme was verified by CFD.Combined with the engineering practice，the modification installing louver guide plates and an ammonia-smoke mixed vortex generator in the tail flue can improve the uniform distribution of particle mass concentration in the flue and solve the local wear of catalyst effectively.

Key words: font-family:NEU-BZ, font-size:9pt, ">SCR denitrationfont-family:方正书宋_GBK, font-size:9pt, ">；font-family:NEU-BZ, font-size:9pt, ">catalyst wearfont-family:方正书宋_GBK, font-size:9pt, ">；font-family:NEU-BZ, font-size:9pt, ">mixed vortex generatorfont-family:方正书宋_GBK, font-size:9pt, ">；font-family:NEU-BZ, font-size:9pt, ">CFDfont-family:方正书宋_GBK, font-size:9pt, ">；font-family:NEU-BZ, font-size:9pt, ">flow field optimization