气基竖炉直接还原炼铁流程重构优化  

Reconstruction optimization of gas-based shaft furnace direct reduction ironmaking process

作　　者：于恒 周继程 郦秀萍[2,3] 上官方钦 YU Heng;ZHOU Ji-cheng;LI Xiu-ping;SHANGGUAN Fang-qin(Tangsteel Company,HBIS Group,Tangshan 063016,Hebei,China;Steel Industry Green and Intelligent Manufacturing Technology Center,China Iron and Steel Research Institute Group,Beijing 100081,China;State Key Laboratory of Advanced Steel Processing and Products,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]河钢集团唐钢公司,河北唐山063016 [2]中国钢研科技集团有限公司钢铁绿色化智能化技术中心,北京100081 [3]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《中国冶金》2021年第1期31-35,45,共6页China Metallurgy

摘　　要：直接还原铁比较纯净、成分稳定,是电炉炼钢的优质原料。中国焦化行业产生大量焦炉煤气,适宜发展以焦炉煤气为还原气的竖炉直接还原炼铁流程,现有工艺主要有Midrex工艺和HYL-ZR工艺。为了解决Midrex工艺和HYL-ZR工艺所存在的问题,通过流程功能分析,提出气基竖炉直接还原重构优化流程,主要工序包括焦炉煤气压缩、TSA预处理、PSA脱碳、PSA提纯CH_(4)、富氢气加热、竖炉直接还原炼铁等。该流程不仅净化焦炉煤气,而且可分离CH_(4),使还原气中H_(2)与CO的比例达到8,并省去CH_(4)重整环节,提高炉内直接还原效率。该流程前端与焦化工序连接,后端与电弧炉连接,不仅有利于钢铁联合企业资源优化配置,而且可以生产天然气,提高能源利用效率。Direct reduction iron(DRI) is a good raw material of electric arc furnace(EAF) steelmaking, which is purity and stable in chemical composition. The coking industry generates large quantities of coke oven gas(COG), which is suitable for the development of shaft furnace direct reduction ironmaking process with COG and the main processes are Midrex process and HYL-ZR process. In order to resolve the problems of Midrex process and HYL-ZR process, through process function analysis, the reconstruction optimization process of gas-based shaft furnace direct reduction ironmaking is proposed through the process function analysis. The main procedures include COG compression, TSA pretreatment, PSA decarbonization, PSA purification of CH_(4), hydrogen-rich gas heating, shaft furnace direct reduction ironmaking, and so on. The process can improve the reduction efficiency of shaft furnace because the COG purification is achieved, CH_(4) is separated, the ratio of H_(2) and CO reaches to 8 in the reduction gas, and the CH_(4) reforming is omitted. The process links the coking process and EAF, which is not only beneficial to the resource optimization of the integrated iron and steel works, but also can produce natural gas and improve energy utilization efficiency.

关 键 词：气基竖炉 直接还原炼铁 焦炉煤气 Midrex工艺 HYL-ZR工艺 流程重构优化 

分 类 号：TF55[冶金工程—钢铁冶金]