摘要
铁矿烧结作为钢铁工业颗粒物、SO_(2)、NO_(x)以及二英等污染物产生和排放量最大的工序,其排放的烟气成分复杂,并且烟气量、烟气温度和污染物质量浓度受生产原料和工况的影响波动较大,该工序已成为实施烟气超低排放改造的重点和难点。本文基于系统观念,分析原(燃)料控制、工艺设备改进对烧结烟气污染物排放的影响,同时研究除尘、脱硫、脱硝等工艺技术之间的匹配性和适应性,以实现最小化副产物和二次污染物排放以及能源消耗。研究结果表明:采用优选燃料、燃料预处理以及燃料预制粒的组合技术可以最大限度地减少污染物的产生;通过优化工艺操作可以实现烧结过程减污降碳协同控制;在末端综合治理方面,利用高炉煤气对烧结烟气进行加热,以及配置烟气换热器能够充分利用烟气中的余热,并降低能源消耗。因此,通过原(燃)料、设备、工艺、运行操作等源头削减与过程控制技术以及除尘、脱硫、脱硝等末端综合治理技术的系统整合,可以实现烧结烟气超低排放的最优化。
As the largest process of producing and emitting such pollutants as particulate matter,SO_(2),NO_(x) and dioxin in the iron and steel industry,iron ore sintering has a complex flue gas composition,and the flue gas volume,flue gas temperature and pollutant quality concentration fluctuate greatly by the influence of production raw materials and working conditions,which has become the focus and difficulty of implementing ultra-low emission transformation of the flue gas.Based on the system concept,the effects of raw material control and process equipment improvement on the emission of sintering flue gas pollutants are analyzed,while the matching and adaptability between process technologies such as dust removal,desulfurization and denitration are researched to minimize by-product and secondary pollutant emissions and energy consumption.The results show that the combined technology of optimized fuel,fuel pretreatment and fuel pregranulation can minimize the generation of pollutants;by optimizing the process operation,the coordinated control of pollution and carbon reduction in the sintering process can be realized;in terms of terminal comprehensive treatment,heating the flue gas and configuring the flue gas exchanger can make full use of the waste heat in the fume and reduce energy consumption.Therefore,through the system integration of source reduction and process control technologies of raw(fuel)materials,equipment,processes,operation operations and terminal comprehensive treatment technologies such as dust removal,desulfurization and denitrification,the optimization of ultra-low sintering fume emissions can be achieved.
作者
江梅
郭敏
程华
刘鸿志
赵韶英
王宗爽
JIANG Mei;GUO Min;CHENG Hua;LIU Hongzhi;ZHAO Shaoying;WANG Zongshuang(Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Shougang Qian'an Iron and Steel Co.,Ltd.,Tangshan 064400,Hebei,China;Chinese Society for Environmental Sciences,Beijing 100082,China;HBIS Group Hansteel Company,Handan 056015,Hebei,China)
出处
《烧结球团》
北大核心
2023年第2期115-121,共7页
Sintering and Pelletizing
关键词
烧结
烟气
系统治理
大气污染
超低排放
sintering
flue gas
system governance
air pollution
ultra-low emission
