关键词: SCR脱硝系统, 脱硝催化剂, 催化剂磨损, 数值模拟, 飞灰, 烟气入射角

Abstract: Since the high-ash-content type SCR denitration system is operated under very rough conditions, the factors such as flue gas flow rate and fly ash particles even the particle diameter will contribute to the wearing away of the catalyst. Through the application of mature CFD numerical simulation software, the abrasion of SCR denitration catalyst was studied under different operating conditions regarding the impacts of flue gas velocity, ash particle diameter, fly ash mass concentration and angle of incidence, then verified through the cold test bench established by ourselves. The results show that the abrasion of the denitration catalyst is closely related to the above four influencing factors, of which the fly ash mass concentration and the angle of incidence of the flue gas make significant impacts on the wear of the catalyst. Therefore, in the actual operation, the deflector baffles should be added to alleviate the abrasions from the non-uniformity of the incident angle or the unevenness of the fly ash mass concentrations. In addition a reasonable flue gas flow rate should be set to reduce wear and tear to ensure the secure operation of the system.

Key words: SCR denitration system, denitration catalyst, catalyst wear, numerical simulation, fly ash, smoke incident angle