氧化铝高温焙烧窑烟气SCR脱硝系统优化改造

Optimization and Reconstruction of SCR Denitrification System of Alumina High Temperature Roasting Kiln Off-gas

针对山东某公司氧化铝高温焙烧窑烟气SCR脱硝系统存在的烘炉工况下烟气温度低、催化剂活性较低、喷氨格栅设置和催化剂吹灰系统设置不合理等问题,采取增设烟气提温燃烧器、采用低温催化剂、优化改造喷氨格栅和喷氨系统、重新布置催化剂吹灰系统等措施进行改造。改造后,烟气NOx排放浓度由100 mg/Nm3降低至35 mg/Nm3以下,喷氨系统运行稳定,产生良好的经济效益和社会效益。

Aiming at the problems such as low off-gas temperature, low catalyst activity, unreasonable setting of ammonia injection grid and unreasonable setting of catalyst powder blowing system of the SCR denitration system for the alumina high temperature roasting kiln off-gas under pre-heating condition for a certain company in Shandong, the reconstruction was carried out by taking measures such as adding temperature-raising burner for pre-heating process, using low-temperature catalyst, optimizing and modifying ammonia injection grid and ammonia injection system, rearranging catalyst powder blowing system, etc. After the reconstruction, the off-gas NOx emission concentration was reduced from 100 mg/Nm3 to below 35 mg/Nm3, and the ammonia injection system operated stably, which have harvested good economic and social benefits.