某特种水泥熟料生产线脱硝工艺选择的探讨  

Discussion on the selection of denitrification process for a special cement clinker production line

作　　者：任勇 折鹏飞 吴振山 陈天佼 陈海 周新桥 赵樊 方鹏 陶东光 吴朋朋 Ren Yong;She Pengfei;Wu Zhenshan;Chen Tianjiao;Chen Hai;Zhou Xinqiao;Zhao Fan;Fang Peng;Tao Dong-guang;Wu Pengpeng(Zaozhuang Engineering Construction Supervision Co.,Ltd.,Zaozhuang,277000,China)

机构地区：[1]枣庄市工程建设监理有限公司,山东枣庄277000 [2]合肥华创碧蓝科技有限公司,安徽合肥230071 [3]北京东方国信科技股份有限公司,北京100020

出　　处：《水泥工程》2024年第3期25-29,共5页Cement Engineering

摘　　要：某特种水泥熟料生产线在“窑头低氮燃烧+分解炉分级燃烧”同时作用下的单位熟料NO_(x)产量为5.52 kg/t,理论推算即使“LNB+SCC+SNCR+SCR”的组合脱硝也不能同时满足NO_(x)超净排放且单位熟料氨耗≤4 kg/t的刚性指标。本文遴选出“LNB+SCC+热碳还原+高效SNCR+高温低尘SCR”的组合脱硝工艺可满足政策要求。实施后NO_(x)排放浓度能够精准调控到45±5 mg/m^(3),单位熟料NO_(x)消减5.38 kg/t,是常规水泥窑脱硝过程单位熟料NO_(x)消减量的3.64倍,预期单位熟料氨耗2.69 kg/t,单位熟料煤耗增加1.36 kg/t,单位熟料电耗增加2.68 kWh/t,单位熟料脱硝综合运行成本由当前的9.31元/t降至7.27元/t,年脱硝运营费用节约113万元。The unit NO_(x) output of a special cement clinker production line under the simultaneous action of"low nitrogen combustion at the kiln head+staged combustion in the decomposition furnace"is 5.52 kg/t.Theoretical calculations show that even the combination of"LNB+SCC+SNCR+SCR"for denitrification cannot simultaneously meet the rigid index of NO_(x) ultra net emissions and unit ammonia consumption of clinker≤4 kg/t.The combination denitrification process of"LNB+SCC+thermal carbon reduction+efficient SNCR+high-temperature and low dust SCR"is selected to meet policy requirements.After implementation,the NO_(x) emission concentration can be precisely controlled to 45±5 mg/m^(3),and the NO_(x) reduction per unit clinker is 5.38 kg/t,which is 3.64 times the NO_(x) reduction per unit clinker in the conventional cement kiln denitrification process.It is expected that the ammonia consumption per unit clinker will be 2.69 kg/t,the coal consumption per unit clinker will increase by 1.36 kg/t,and the electricity consumption per unit clinker will increase by 2.68 kWh/t.The comprehensive operating cost per unit clinker denitrification will be reduced from the current 9.31 yuan/t to 7.27 yuan/t,and the annual denitrification operating cost will be saved by 1.13 million yuan.

关 键 词：SCR脱硝 精准脱硝 气化炉 热碳还原 特种水泥 氨氮比 

分 类 号：TQ172.6[化学工程—水泥工业]