Practice and exploration of green and high efficiency operation of new generation steel manufacturing process
YANG Chunzheng1, DONG Xiangjuan1,2, ZHAO Changliang1, WANG Fei1,3
1. Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China; 2. Metallurgical Technology Institute, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China; 3. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Abstract：As a new generation steel manufacturing process with the characteristics of "dynamic-ordered, collaborative-continuous", Shougang Jingtang Iron and Steel Plant was built by adopting the theory of metallurgical process engineering and a series of advanced technologies. More than ten years of operational practice shows that building a briefness and smooth process network for the new generation steel manufacturing process is more conducive to high efficiency material flow and least dissipation of energy flow and also the implement of the overall throughout of information flow. The blast furnace (BF) has achieved long-term, green, low-carbon, high-efficient and stable operation by applying a series of technologies including over 50% high proportion pellet smelting, high oxygen enrichment and high air temperature, coal injection for coke reduction, and sintering for carbon reduction and emission reduction. The BF utilization coefficient,coke rate and coal injection rate has reached over 2.52 t/(m3·d),264.1 kg/t and 203.2 kg/t. By hot metal tank in the BF-BOF interface, the temperature drop of hot metal has achieved to be less than 95 ℃. High temperature molten iron above 1 400 ℃ through hot metal desulfurization pretreatment based on KR process, high-efficient, the proportion of w(S) ≤0.002 0% is more than 95% after KR. Owing to the advanced process network of the clean steel platform, specialized production organization, and process technology improvement, the bath average carbon-oxygen equilibrium at endpoint for the entire service life of BOF has reduced to 0.001 47, the average tapping temperature of BOF in 2022 has reduced to 1 641 ℃, and the IF steel intermediate ladle has a total oxygen content of as low as 0.001 5% on average throughout 2022, and the casting speed of continuous casting low-carbon steel has reached over 2.0 m/min achieving high efficiency, achieving high efficiency, green and low-carbon production of high-quality clean steel sheets. The process energy efficiency has been significant improved through efficient energy conversion, recycling, and utilization technologies, a significant improvement in process energy efficiency and CO2 emission reduction have been achieved by using a series technologies involving source reduction, high-efficient treatment, and resource reuse for pollutants and solid waste. Also, fresh-water consumption per ton of steel in the whole process is only 2.62 m3 (The proportion of desalinated water is 66%), the ultra-low emission of gas pollutant and near zero emissions of solid waste and water have been achieved.
杨春政, 董相娟, 赵长亮, 王飞. 新一代钢铁制造流程绿色化高效运行实践探索[J]. 钢铁, 2023, 58(11): 19-31.
YANG Chunzheng, DONG Xiangjuan, ZHAO Changliang, WANG Fei. Practice and exploration of green and high efficiency operation of new generation steel manufacturing process[J]. Iron and Steel, 2023, 58(11): 19-31.
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2023, Vol. 58 
