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Thermodynamic Study on Reduction of Iron Oxides by H 2 + CO + CH 4 + N 2 Mixture at 900 °C

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  • Guanyong Sun

    (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China)

  • Bin Li

    (College of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China)

  • Hanjie Guo

    (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China)

  • Wensheng Yang

    (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China)

  • Shaoying Li

    (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China)

  • Jing Guo

    (School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China)

Abstract

The reduction gas used in the gas-based direct reduction iron-making process contains CH 4 in different concentrations, which has an important effect on the gas and heat needed for the reduction of iron oxide. To investigate the influence of CH 4 on gas utilization rate and heat needed at 900 °C, the initial conditions are set as H 2 % + CO% = 90, CH 4 % + N 2 % = 10, gas pressure 1–9 atm, and 0.5 mol Fe 2 O 3 , and the equilibrium state composition is calculated using the minimum free energy method. The utilization rate of total gas can be improved, and gas demand can be decreased by increasing CH 4 concentration or H 2 concentration or reducing gas pressure. For the production of per ton of Fe from 25 °C to 900 °C, 6.08–7.29 m 3 of reduction gas, and 7.338–8.952 MJ of gas sensible heat can be saved by increasing 1 m 3 CH 4 , while 10.959–11.189 MJ of reaction heat is increased. Compared with 3390.828–3865.760 MJ of the total heat of per ton of Fe for the reduction by H 2 + CO, 2.174–3.703 MJ of total heat is increased by increasing 1 m 3 CH 4 , and the increase ratio is 0.065–0.096%. This study is helpful to improve the gas efficiency and lower the pursuit of higher concentration of H 2 + CO in reduction gas.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:19:p:5053-:d:419547
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    References listed on IDEAS

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    1. 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.
    2. Wei, Rufei & Feng, Shanghuan & Long, Hongming & Li, Jiaxin & Yuan, Zhongshun & Cang, Daqiang & Xu, Chunbao (Charles), 2017. "Coupled biomass (lignin) gasification and iron ore reduction: A novel approach for biomass conversion and application," Energy, Elsevier, vol. 140(P1), pages 406-414.
    3. Abhinav Bhaskar & Mohsen Assadi & Homam Nikpey Somehsaraei, 2020. "Decarbonization of the Iron and Steel Industry with Direct Reduction of Iron Ore with Green Hydrogen," Energies, MDPI, vol. 13(3), pages 1-23, February.
    4. 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.
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