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| Life cycle assessment of coking process in context of ultra-low emission policy on iron and steel industry |
| DU Bin1,2, LI Ran1, YANG Hua3, LIN Lijuan1, QI Zenglu1,4 |
1. Miyun Reservoir Eco-Environmental Science and Civilization Research Center, Beijing 101512, China;
2. School of Environment, Tsinghua University, Beijing 100084, China;
3. Xinjiang Economic and Technological Commission, Yuncheng 043100, Shanxi, China;
4. Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China |
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Abstract 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 41.6% 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.
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Received: 09 May 2023
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2023, Vol. 33 
