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<p>Driven by the “dual carbon” strategy for low-carbon steel transformation, raising the pellet ratio in the blast furnace (BF) burden offers a core technical path to optimize burden structure and cut carbon emissions. The distribution of BF burden critically influences operation by affecting internal gas flow, heat and mass transfer, and chemical reactions. This study employs the discrete element method (DEM) to examine how burden structure affects bed porosity at high pellet ratios, emphasizing mixed-layer formation. Key findings include: (1) Porosity evolution patterns in mixed burden layers under varying furnace charge configurations were characterized. (2) Porosity is minimized at the ore-coke interface because of particle penetration. Additionally, this effect intensifies as the coke-ore size difference increases. (3) Increasing the pellet ratio enhances lump-zone bed porosity and permeability. As the pellet ratio increased from 30 to 90%, bed porosity rose from 33.75 to 36.19%, a 2.43% increase.</p> Graphical Abstract <p></p>

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Investigation of porosity model construction for high pellet ratio mixed-burden layers in blast furnace

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yating Cui,
  • Ruishuai Si,
  • Zhenyang Wang,
  • Jianliang Zhang,
  • kexin Jiao,
  • Peiyuan Lu

摘要

Driven by the “dual carbon” strategy for low-carbon steel transformation, raising the pellet ratio in the blast furnace (BF) burden offers a core technical path to optimize burden structure and cut carbon emissions. The distribution of BF burden critically influences operation by affecting internal gas flow, heat and mass transfer, and chemical reactions. This study employs the discrete element method (DEM) to examine how burden structure affects bed porosity at high pellet ratios, emphasizing mixed-layer formation. Key findings include: (1) Porosity evolution patterns in mixed burden layers under varying furnace charge configurations were characterized. (2) Porosity is minimized at the ore-coke interface because of particle penetration. Additionally, this effect intensifies as the coke-ore size difference increases. (3) Increasing the pellet ratio enhances lump-zone bed porosity and permeability. As the pellet ratio increased from 30 to 90%, bed porosity rose from 33.75 to 36.19%, a 2.43% increase.

Graphical Abstract