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Thermodynamic analysis of the partial oxidation of coke oven gas for indirect reduction of iron oxides in a blast furnace

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  • Chen, Wei-Hsin
  • Hsu, Chih-Liang
  • Du, Shan-Wen

Abstract

The partial oxidation of a COG (coke oven gas) in a blast furnace is examined in this work using thermodynamic analysis. LTIR and HTIR (Low-temperature and high-temperature indirect reduction) of iron oxides in a blast furnace are also studied. The influences of the reaction temperature, M/H (methane-to-hematite) ratio, and O/F (oxygen-to-fuel) ratio on CH4 conversion and iron oxide reduction are examined. Within the investigated ranges of the parameters, a higher reaction temperature is conducive to CH4 conversion, while at least 97.64% of Fe2O3 is reduced. In LTIR, Fe3O4 is the prime product, with a high level of solid carbon formation. The entire LTIR reaction is characterized by exothermic behavior, so that no additional heat is required to trigger COG partial oxidation and IR. In HTIR, increasing the reaction temperature facilitates CO-based IR and suppresses H2-based IR. A higher temperature produces more Fe, so as to enhance the iron oxide reduction reactions; meanwhile, the FeO reduction is governed by H2 and CH4. When the reaction temperature is higher than 800 °C and the M/H ratio is lower than unity, a heat supply is required to drive HTIR. The O/F ratio in LTIR and HTIR should be controlled below 2 to retard carbon formation and drive iron oxide reduction.

Suggested Citation

  • Chen, Wei-Hsin & Hsu, Chih-Liang & Du, Shan-Wen, 2015. "Thermodynamic analysis of the partial oxidation of coke oven gas for indirect reduction of iron oxides in a blast furnace," Energy, Elsevier, vol. 86(C), pages 758-771.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:758-771
    DOI: 10.1016/j.energy.2015.04.087
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    References listed on IDEAS

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    2. Yi, Qun & Gong, Min-Hui & Huang, Yi & Feng, Jie & Hao, Yan-Hong & Zhang, Ji-Long & Li, Wen-Ying, 2016. "Process development of coke oven gas to methanol integrated with CO2 recycle for satisfactory techno-economic performance," Energy, Elsevier, vol. 112(C), pages 618-628.
    3. Jiao, Kexin & Feng, Guangxiang & Zhang, Jianliang & Wang, Cui & Zhang, Lei, 2023. "Effect of multi-component gases on the behavior and mechanism of carbon deposition in hydrogen-rich blast furnaces," Energy, Elsevier, vol. 263(PA).
    4. Guanyong Sun & Bin Li & Hanjie Guo & Wensheng Yang & Shaoying Li & Jing Guo, 2021. "Thermodynamic Study of Energy Consumption and Carbon Dioxide Emission in Ironmaking Process of the Reduction of Iron Oxides by Carbon," Energies, MDPI, vol. 14(7), pages 1-29, April.
    5. Guanyong Sun & Bin Li & Wensheng Yang & Jing Guo & Hanjie Guo, 2020. "Analysis of Energy Consumption of the Reduction of Fe 2 O 3 by Hydrogen and Carbon Monoxide Mixtures," Energies, MDPI, vol. 13(8), pages 1-13, April.
    6. Xiang, Dong & Huang, Weiqing & Huang, Peng, 2018. "A novel coke-oven gas-to-natural gas and hydrogen process by integrating chemical looping hydrogen with methanation," Energy, Elsevier, vol. 165(PB), pages 1024-1033.
    7. Yi, Qun & Wu, Guo-sheng & Gong, Min-hui & Huang, Yi & Feng, Jie & Hao, Yan-hong & Li, Wen-ying, 2017. "A feasibility study for CO2 recycle assistance with coke oven gas to synthetic natural gas," Applied Energy, Elsevier, vol. 193(C), pages 149-161.
    8. Guanyong Sun & Bin Li & Hanjie Guo & Wensheng Yang & Shaoying Li & Jing Guo, 2020. "Thermodynamic Study on Reduction of Iron Oxides by H 2 + CO + CH 4 + N 2 Mixture at 900 °C," Energies, MDPI, vol. 13(19), pages 1-18, September.

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