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<p>The self-reforming of coke oven gas (COG) in a gas-based shaft furnace was investigated, employing metallized iron as a catalyst. Thermodynamic analyses, supported by FactSage 8.3 calculations and regression modeling, were used to investigate the effects of temperature (700–1100&#xa0;°C), CO<sub>2</sub> (3%–10%), and H<sub>2</sub>O (1%–9%) concentrations on CH<sub>4</sub> conversion efficiency. Results indicate that CH<sub>4</sub> conversion exceeds 90% at temperatures above 1000&#xa0;°C, with CO<sub>2</sub> and H<sub>2</sub>O concentrations at 9% and 5%, respectively. During the reforming process, introducing CO<sub>2</sub> provides additional oxygen, facilitating the oxidation of CH<sub>4</sub>, while H<sub>2</sub>O enhances H<sub>2</sub> production through the steam reforming pathway. Experimental findings reveal a CH<sub>4</sub> conversion of 85.83% with a H<sub>2</sub>/CO ratio of 5.44 at 1050&#xa0;°C. In addition, an optimal H<sub>2</sub>O concentration of 6% yields the highest CH<sub>4</sub> conversion of 84.24%, while CO<sub>2</sub> exhibits minimal effects on promoting the reforming process. Increasing the metallization rate of pellets from 43% to 92% significantly enhances CH<sub>4</sub> reforming. This is mainly due to the fact that metallized iron is vital in promoting CH<sub>4</sub> dissociation and improving syngas yield by providing active sites for the redox cycle of CO<sub>2</sub> and H<sub>2</sub>O.</p>

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Self-reforming of coke oven gas in gas-based shaft furnace: thermodynamic analysis and reforming mechanism

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Chen-mei Tang,
  • Shu-bing Shi,
  • Jian Pan,
  • De-qing Zhu,
  • Zheng-qi Guo,
  • Cong-cong Yang,
  • Si-wei Li

摘要

The self-reforming of coke oven gas (COG) in a gas-based shaft furnace was investigated, employing metallized iron as a catalyst. Thermodynamic analyses, supported by FactSage 8.3 calculations and regression modeling, were used to investigate the effects of temperature (700–1100 °C), CO2 (3%–10%), and H2O (1%–9%) concentrations on CH4 conversion efficiency. Results indicate that CH4 conversion exceeds 90% at temperatures above 1000 °C, with CO2 and H2O concentrations at 9% and 5%, respectively. During the reforming process, introducing CO2 provides additional oxygen, facilitating the oxidation of CH4, while H2O enhances H2 production through the steam reforming pathway. Experimental findings reveal a CH4 conversion of 85.83% with a H2/CO ratio of 5.44 at 1050 °C. In addition, an optimal H2O concentration of 6% yields the highest CH4 conversion of 84.24%, while CO2 exhibits minimal effects on promoting the reforming process. Increasing the metallization rate of pellets from 43% to 92% significantly enhances CH4 reforming. This is mainly due to the fact that metallized iron is vital in promoting CH4 dissociation and improving syngas yield by providing active sites for the redox cycle of CO2 and H2O.