摘要
在国家“双碳”战略目标背景下,钢铁行业作为高碳排放的重点领域,加速推进绿色低碳转型已刻不容缓。依托焦炉煤气资源丰富的优势,我国氢基竖炉直接还原技术对国外已成熟应用的Midrex法和HYL/Energiron法进行优化改进,其以富氢或纯氢气体为还原剂生产固态海绵铁,已在多个项目中取得阶段性成果。为此,本文重点探讨氢基竖炉直接还原技术的工艺特点、减碳机制以及经济价值。结果表明:氢基竖炉生产系统包含多个部分,核心是氢基竖炉本体,其以H_(2)还原为主、CO还原为辅,生产的DRI成分稳定、化学反应活性高。该工艺的减碳关键环节:借助炉内条件,CH_(4)-CO_(2)重整避免外部重整带来的高能耗问题,可实现能源循环利用;采用MDEA化学吸附法,能够高效脱除CO_(2);而在CO_(2)利用环节,通过多级精制工艺可制备出纯度达99.9%的食品级CO_(2)产品,创造显著的经济效益。基于焦炉煤气的氢基竖炉直接还原零重整工艺结合CCUS技术,相比传统高炉炼铁,可实现碳减排超60%,同时大幅降低粉尘、SO_(2)、NO_(x)等污染物排放。
Under the background of the national“dual carbon”strategic goal,the steel industry,as a key area of high carbon emissions,has an urgent need to accelerate the green and low-carbon transformation.Relying on the advantages of abundant coke oven gas resources,China’s direct reduction technology of hydrogen-based shaft furnace has optimized and improved the mature application of Midrex method and HYL/Energion method in foreign countries,taking hydrogen-rich or pure hydrogen gas as the reducing agent to produce solid sponge iron,which has achieved phased results in many projects.Therefore,the process characteristics,carbon reduction mechanism and economic value of direct reduction technology for hydrogen-based shaft furnace are focused on.The results show that the hydrogen-based shaft furnace production system consists of multiple parts,and the core is the hydrogen-based shaft furnace itself,which is mainly based on H_(2) reduction and supplemented by CO reduction,with stable DRI composition produced and high chemical reaction activity.The key link of carbon reduction in the process:with the help of furnace conditions,CH_(4)-CO_(2) reforming avoids the high energy consumption caused by external reforming,and can realize energy recycling;The MDEA chemical adsorption method can remove CO_(2) efficiently;In the CO_(2) utilization process,food-grade CO_(2) products with a purity of 99.9%can be prepared through a multi-stage refining process,creating significant economic benefits.The hydrogen-based shaft furnace direct reduction zero reforming process based on coke oven gas combined with CCUS technology can reduce carbon emissions by more than 60%compared with traditional blast furnace ironmaking,greatly reducing the emission of pollutants such as dust,SO_(2) and NO_(x).
作者
冀宗贺
刘艳峰
李兰杰
田志强
牛佳星
王小艾
JI Zonghe;LIU Yanfeng;LI Lanjie;TIAN Zhiqiang;NIU Jiaxing;WANG Xiaoai(HBIS Materials Technology Research Institute,Shijiazhuang 052160,Hebei,China;HBIS Group Zhangxuan Technology Co.,Ltd.,Xuanhua 075100,Hebei,China;Key Laboratory of Low Carbon Technology of Hydrogen Metallurgy in Hebei Province,Shijiazhuang 052160,Hebei,China)
出处
《烧结球团》
北大核心
2025年第3期20-25,共6页
Sintering and Pelletizing
基金
河北省战略性技术专项(23314601L)。
关键词
氢基直接还原
碳排放
碳捕集
短流程
氢冶金
hydrogen-based direct reduction
carbon emissions
carbon capture
short process
hydrogen metallurgy
