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<p>Pulverized coal injection (PCI) not only reduces the coke ratio and pig iron production cost, but also improves the working state, thus increasing the stability of blast furnace (BF) operation. Therefore, it is essential to study the thermo-chemical behaviors of gas, coke, and pulverized coal (PC) in the raceway to optimize BF production. In this study, the influences of blast parameters and PCI rate on the transport phenomena, combustion characteristics, and kinetic and thermo-chemical behaviors of raceway are simulated by a three-dimensional reactive discrete element model-computational fluid dynamics-discrete phase model (DEM-CFD-DPM). Results show that PC burnout increases with decreasing PCI rate and increasing oxygen concentration and blast velocity. The mass loss in the coke bed decreases when the PCI rate increases and the blast velocity and oxygen concentration decrease. The coke temperature rises with the PCI rate, blast velocity, and oxygen concentration. When the PCI rate rises from 0 to 0.2&#xa0;kg/s, the peak value of gas temperature increases from 1908&#xa0;K to 2355&#xa0;K. As the PCI rate, blast velocity, and oxygen concentration increase, the size of the raceway expands. The results can provide valuable insights into optimizing BF process parameters and developing low-carbon technologies.</p>

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Effects of PCI Rate and Blast Parameters on Gas–Coal–Coke Co-combustion in Blast Furnace Raceway: A Particulate-Scale Study

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Meng Li,
  • Caiyun Wang,
  • Chao Li,
  • Zhong Li,
  • Xizhong An

摘要

Pulverized coal injection (PCI) not only reduces the coke ratio and pig iron production cost, but also improves the working state, thus increasing the stability of blast furnace (BF) operation. Therefore, it is essential to study the thermo-chemical behaviors of gas, coke, and pulverized coal (PC) in the raceway to optimize BF production. In this study, the influences of blast parameters and PCI rate on the transport phenomena, combustion characteristics, and kinetic and thermo-chemical behaviors of raceway are simulated by a three-dimensional reactive discrete element model-computational fluid dynamics-discrete phase model (DEM-CFD-DPM). Results show that PC burnout increases with decreasing PCI rate and increasing oxygen concentration and blast velocity. The mass loss in the coke bed decreases when the PCI rate increases and the blast velocity and oxygen concentration decrease. The coke temperature rises with the PCI rate, blast velocity, and oxygen concentration. When the PCI rate rises from 0 to 0.2 kg/s, the peak value of gas temperature increases from 1908 K to 2355 K. As the PCI rate, blast velocity, and oxygen concentration increase, the size of the raceway expands. The results can provide valuable insights into optimizing BF process parameters and developing low-carbon technologies.