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<p>With the promotion of some low-carbon smelting technologies, the coke load in blast furnace continues to increase, making the skeleton function of coke more important. At present, the commonly used test method developed by the Nippon Steel Corporation is not suitable to evaluate coke quality effectively due to its overly simplified experimental conditions compared to actual blast furnace environments. To evaluate coke quality accurately, it is crucial to conduct quantitative research on coke degradation behavior in the blast furnace. In this study, the degradation behavior of metallurgical coke under simulated blast furnace conditions was quantified using a self-developed device. The effects of high temperature, carbon loss reaction with CO<sub>2</sub> and alkali metal catalysis on the properties and structures of top-charging coke and stamp-charging coke were studied systematically. The results indicate that coke weight loss and large particles degradation mainly occur above 1200 °C in the cohesive and dripping zone of BF, while the alkali metal catalysis acts as the main reason for these occurrence, indicating that the Nippon Steel Corporation indices obtained under alkali metals-free conditions at 1100 °C are not representative. The formation of coke fines is mainly driven by high temperature, which should be assessed separately as the pulverization rate is not exactly consistent with the degradation rate of large coke particles. As the coke structure evolves in the blast furnace, increases in porosity and the volume fraction of low-roundness pores lead to a decrease in compressive strength. Graphitization and low-roundness pores further accelerate coke pulverization. Although the Nippon Steel Corporation test method indicates better performance, stamp-charging coke displays weaker resistance to high temperature and alkali metals, resulting in a higher weight loss and lower compressive strength compared to top-charging coke. The quantified degradation behavior of coke presented in our study will assist the blast furnace operators in monitoring and regulating coke quality, ultimately supporting the goal of low-carbon and economic smelting in blast furnace.</p>

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Quantitative Detection and Mechanism Analysis of Degradation Behavior of Metallurgical Coke in Blast Furnace: Comparison Between Top-Charging Coke and Stamp-Charging Coke

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Jingbo Chen,
  • Shengfu Zhang,
  • Qingxu Cai,
  • Xianyou Huang,
  • Shuxing Qiu,
  • Jianming Wang,
  • Chenguang Bai

摘要

With the promotion of some low-carbon smelting technologies, the coke load in blast furnace continues to increase, making the skeleton function of coke more important. At present, the commonly used test method developed by the Nippon Steel Corporation is not suitable to evaluate coke quality effectively due to its overly simplified experimental conditions compared to actual blast furnace environments. To evaluate coke quality accurately, it is crucial to conduct quantitative research on coke degradation behavior in the blast furnace. In this study, the degradation behavior of metallurgical coke under simulated blast furnace conditions was quantified using a self-developed device. The effects of high temperature, carbon loss reaction with CO2 and alkali metal catalysis on the properties and structures of top-charging coke and stamp-charging coke were studied systematically. The results indicate that coke weight loss and large particles degradation mainly occur above 1200 °C in the cohesive and dripping zone of BF, while the alkali metal catalysis acts as the main reason for these occurrence, indicating that the Nippon Steel Corporation indices obtained under alkali metals-free conditions at 1100 °C are not representative. The formation of coke fines is mainly driven by high temperature, which should be assessed separately as the pulverization rate is not exactly consistent with the degradation rate of large coke particles. As the coke structure evolves in the blast furnace, increases in porosity and the volume fraction of low-roundness pores lead to a decrease in compressive strength. Graphitization and low-roundness pores further accelerate coke pulverization. Although the Nippon Steel Corporation test method indicates better performance, stamp-charging coke displays weaker resistance to high temperature and alkali metals, resulting in a higher weight loss and lower compressive strength compared to top-charging coke. The quantified degradation behavior of coke presented in our study will assist the blast furnace operators in monitoring and regulating coke quality, ultimately supporting the goal of low-carbon and economic smelting in blast furnace.