摘要
2019年生态环境部出台了《关于推进实施钢铁行业超低排放的意见》,其对排放的大气污染物实施了严格管控。炼焦工序作为冶金过程中污染物排放量较大的工序之一,是超低排放改造的重中之重。运用可提供生命周期中点评价与终点评价的ReCiPe2016软件建立生命周期评价(LCA)模型,选择“摇篮-工厂大门”作为系统边界,对比分析了山西省2家典型钢铁企业未经超低排放处理及处理后的焦炉烟气对环境的影响。结果表明,超低排放处理过程中焦炉烟气的环境影响从直接对人体健康的伤害转换为对生态系统的危害,但总体而言,超低排放处理后烟气的总环境影响相比于未经过处理的烟气降低了0.88~1.47,因而超低排放改造总体上是有益的。进一步的分析表明此过程中SCR脱硝产生的环境负荷最大,占总环境影响的41.6%~48.3%,而电能是造成SCR脱硝环境负荷的关键因素。作为下一步高质量发展重点,钢铁行业应通过优化污染物处理工艺,减少能源消耗,并通过发展颠覆性技术实现传统污染物零排放,从而完成绿色低碳转型。
The Ministry of Ecological Environment issued the ultra-low emission policy on iron and steel industry in 2019,which contains the stringent emission limits for sulfur dioxide,nitrogen oxides,and particulate matter.As one of the most polluting metallurgical processes,coking has been listed as key modification process.ReCiPe2016,a harmonized life cycle impact assessment software method at midpoint and endpoint levels,was adopted to developed the LCA(Life Cycle Assessment)models,with"cradle to gate"had been selected as the system boundary.The environmental impacts of unprocessed coke oven gases and coke oven gases processed by ultra-low emission pollution control technology from two typical metallurgical plants in Shanxi Province were analyzed.The results show that the ultra-low emission pollution control technology could cause the transfer of environmental impact by coke oven gases from harm to human health to harm to the ecosystem,but overall,it is beneficial to the environment(i.e.,the total environmental impact of coke oven gases has been reduced by 0.88-1.47).Further analysis indicates that SCR denitrification has the greatest environmental impact,accounting for 4l.6%to 48.3%of the total environmental impact,and that electricity has been identified as the most influential substance affecting the environmental load of the SCR system.As the next sustainable development focus,the iron and steel industry should focus on the simultaneous reduction of pollutants and carbon emissions,and achieve zero emissions and green and low-carbon transformation by optimizing the pollutant control process and developing cutting-edge technologies.
作者
杜斌
李然
杨花
林丽娟
齐增禄
DU Bin;LI Ran;YANG Hua;LIN Lijuan;QI Zenglu(Miyun Reservoir Eco-Environmental Science and Civilization Research Center,Beijing 101512,China;School of Environment,Tsinghua University,Beijing 100084,China;Xinjiang Economic and Technological Commission,Yuncheng 043100,Shanxi,China;Research Center for Eco-Environmental Science,Chinese Academy of Sciences,Beijing 100085,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2023年第10期116-124,共9页
China Metallurgy
基金
国家自然科学基金资助项目(51908541)。
