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
任勇 1折鹏飞 2吴振山 3陈天佼 3陈海 3周新桥 2赵樊 3方鹏 2陶东光 3吴朋朋2
作者信息
- 1. 枣庄市工程建设监理有限公司,山东枣庄 277000;合肥华创碧蓝科技有限公司,安徽合肥 230071
- 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
- 折叠
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NOx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NOx超净排放且单位熟料氨耗≤4kg/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NOx排放浓度能够精准调控到45±5mg/m3,单位熟料NO,消减5.38kg/t,是常规水泥窑脱硝过程单位熟料NOx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1.36kg/t,单位熟料电耗增加2.68kWh/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.
Abstract
The unit NOx 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 NOx 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 NOx emission concentration can be precisely controlled to 45±5 mg/m3,and the NOx reduction per unit clinker is 5.38 kg/t,which is 3.64 times the NOx 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Key words
SCR denitrification/accurate denitrification/gasifier/thermal carbon reduction/special cement/ammonia nitrogen ratio引用本文复制引用
出版年
2024
NETL
NSTL
万方数据