Analysis of theoretical limit energy consumption and CO2 emissions of a typical iron and steelmaking production process
ZHANG Qi1,2,3, JI Yangmei1, LI Yutao4, GU Jinghua4, ZHANG Yunlong4
1. State Environment Protection Key Laboratory of Eco-Industry, Northeastern University, Shenyang 110819, Liaoning, China; 2. Liaoning Province Engineering Research Center for Energy Saving and Green Low Carbon Technologies in Process Industry, Shenyang 110819, Liaoning, China; 3. Engineering Research Center of Ministry of Frontier Technologies of Low-Carbon Steelmaking(Ministry of Education), Shenyang 110819, Liaoning, China; 4. Baoshan Iron and Steel Co.,Ltd., Baowu Group, Shanghai 201900, China
Abstract:The blast furnace-basic oxygen furnace process is a typical iron and steelmaking production process,which is also a typical iron-coal chemical process,and its material and energy consumption and CO2 emissions have been high. Under the double carbon target,the energy saving and CO2 emissions of the iorn and steelmaking production process are under great pressure and challenge. Therefore,the study of extreme energy consumption and carbon emission based on the typical BF-BOF long process steelmaking and the short process of electric arc furnace steelmaking have attracted attention. Based on the reaction mechanism of iorn and steelmaking production process,thermodynamic and thermochemical theories are used,assumptions are made for the corresponding production processes,and actual raw materials,fuel parameters and reaction conditions are used to calculate the theoretical limit energy consumption and theoretical CO2 emissions of typical iorn and steelmaking production processes from the perspective of process and the whole process. The theoretical limit energy consumption and CO2 emission of blast-converter long process are 389.29 kg/t and 824.08 kg/t(CO2) when the rolling process is cold charging and the raw material is all hot metal. Under the condition of 15% scrap ratio,the theoretical limit energy consumption and CO2 emission of BF-BOF long process are reduced to 338.56 kg/t and 681.30 kg/t(CO2). The energy consumption of iron and iorn and steelmaking production is further reduced when the short process of electricarc furnace steelmaking is adopted. If 100% scrap is used,the theoretical limit energy consumption and CO2 emissions of the short-process steelmaking process are 72.76 kg/t and 328.79 kg/t(CO2),respectively. When the raw material is DRI or hot metal,the energy consumption of the EAF steelmaking process is reduced,but it is not conducive to the reduction of the whole process energy consumption. In summary,the effects of different raw material structures and smelting processes on the energy consumption and CO2 emissions of the whole process are also discussed,in order to provide theoretical data for the analysis of extreme energy efficiency and extreme carbon emissions of iron and steelmaking production processes,so as to explore the energy saving and emission reduction potential of typical production processes and help the steel industry achieve its carbon neutrality goal.
张琦, 籍杨梅, 李宇涛, 顾菁华, 张云龙. 典型钢铁生产流程理论极限能耗与CO2排放分析[J]. 钢铁, 2023, 58(11): 132-140.
ZHANG Qi, JI Yangmei, LI Yutao, GU Jinghua, ZHANG Yunlong. Analysis of theoretical limit energy consumption and CO2 emissions of a typical iron and steelmaking production process[J]. Iron and Steel, 2023, 58(11): 132-140.
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