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<p>In a hydrogen-rich blast furnace, an increased coke load accentuates the support skeleton role of coke, particularly in the cohesive and dripping zones following partial dissolution with slag. To investigate the dissolution behaviours of coke in these regions, coke samples were gasified in a N<sub>2</sub>–CO–CO<sub>2</sub>–H<sub>2</sub>–H<sub>2</sub>O atmosphere, simulating hydrogen-rich blast furnace conditions. Subsequently, the dissolution of gasified coke with slag containing FeO was analysed. The influence of coke gasification degree and FeO concentration in slag on coke dissolution was examined. The results showed that both higher coke gasification degrees and increased FeO content accelerate coke mass loss and exacerbate surface degradation upon dissolution, while effects on the internal structure of coke remain relatively minor, especially regarding FeO concentration. Additionally, hydrogen-rich gasification raised the graphitisation level of coke, with dissolution further enhancing the graphitisation of gasified coke.</p>

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Coke dissolution with FeO-containing slag in hydrogen-rich blast furnace

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Hao Liu,
  • Huang-jie Hua,
  • Yue-lin Qin,
  • Wei-qiang Liu,
  • Shi-hong Peng,
  • Fei Meng

摘要

In a hydrogen-rich blast furnace, an increased coke load accentuates the support skeleton role of coke, particularly in the cohesive and dripping zones following partial dissolution with slag. To investigate the dissolution behaviours of coke in these regions, coke samples were gasified in a N2–CO–CO2–H2–H2O atmosphere, simulating hydrogen-rich blast furnace conditions. Subsequently, the dissolution of gasified coke with slag containing FeO was analysed. The influence of coke gasification degree and FeO concentration in slag on coke dissolution was examined. The results showed that both higher coke gasification degrees and increased FeO content accelerate coke mass loss and exacerbate surface degradation upon dissolution, while effects on the internal structure of coke remain relatively minor, especially regarding FeO concentration. Additionally, hydrogen-rich gasification raised the graphitisation level of coke, with dissolution further enhancing the graphitisation of gasified coke.