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<p>Multi-step scrap addition is an effective strategy for further enhancing the carbon reduction and production profit in long-process steelmaking. In this paper, an integrated model for coordinating the allocation of multi-step scrap steel addition with economy in a long-process 170 t converter steelmaking route was developed, verified, and applied in plant. The proposed model includes independent and integrated control modules for evaluating the scrap steel addition strategy in the hot metal ladle, converter, and refining furnace with considering the production profit. The results showed that the average absolute error of the predicted end-point steel yield is within 1.9%. The price and quantity of scrap steel significantly affect the profit from the end-point molten steel. When the scrap price added to the ladle is below 1900 CNY/t, increasing the scrap addition amount significantly enhances profits. However, the profit increment gradually diminishes when the price exceeds 2600 CNY/t. Additionally, an optimal scrap allocation model was developed to dynamically calculate the best addition amounts for each operation using an enumeration method, aimed at optimizing production costs and enhancing corporate competitiveness. Case analysis demonstrated that, under specified conditions, adding 5 t, 60 t, and 1 t of scrap steel to the hot metal ladle, converter, and refining furnace, respectively, can maximize profit. The present approach offers effective guidance for scrap steel allocation and provides important theoretical support for maximizing economic benefits.</p> Graphical Abstract <p></p>

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An Integrated Model for Coordinating Multi-step Scrap Allocation with Economy in Long-Process Steelmaking

  • 期刊论文

  • 发表日期：

    2025年8月8日

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  • Jianhao Wang,
  • Qing Fang,
  • Pengsheng Lu,
  • Zhengchao Huang,
  • Jialian Zhang,
  • Hua Zhang,
  • Hongwei Ni

摘要

Multi-step scrap addition is an effective strategy for further enhancing the carbon reduction and production profit in long-process steelmaking. In this paper, an integrated model for coordinating the allocation of multi-step scrap steel addition with economy in a long-process 170 t converter steelmaking route was developed, verified, and applied in plant. The proposed model includes independent and integrated control modules for evaluating the scrap steel addition strategy in the hot metal ladle, converter, and refining furnace with considering the production profit. The results showed that the average absolute error of the predicted end-point steel yield is within 1.9%. The price and quantity of scrap steel significantly affect the profit from the end-point molten steel. When the scrap price added to the ladle is below 1900 CNY/t, increasing the scrap addition amount significantly enhances profits. However, the profit increment gradually diminishes when the price exceeds 2600 CNY/t. Additionally, an optimal scrap allocation model was developed to dynamically calculate the best addition amounts for each operation using an enumeration method, aimed at optimizing production costs and enhancing corporate competitiveness. Case analysis demonstrated that, under specified conditions, adding 5 t, 60 t, and 1 t of scrap steel to the hot metal ladle, converter, and refining furnace, respectively, can maximize profit. The present approach offers effective guidance for scrap steel allocation and provides important theoretical support for maximizing economic benefits.

Graphical Abstract