Effect of H2/CO Ratio on Gas Consumption and Energy Utilization Rate of Gas-Based Direct Reduction Process

  • C. Y. Xu
  • A. Y. Zheng
  • J. L. Zhang
  • R. R. Wang
  • Y. Li
  • Y. Z. Wang
  • Z. J. LiuEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


Direct reduced iron (DRI) is an indispensable raw material for producing high-quality steel and an alternative to scrap. The Midrex process and the HYL process are the main gas-based direct reduction processes for producing DRI. In this paper, the theoretical analysis of the thermal mass balance in the shaft furnace under different H2/CO ratios is carried out. The reduction of gas consumption of different H2/CO ratios was calculated by the formulas. These calculated values are fitted with curves to obtain the relationship between the reducing gas consumption and the H2/CO ratio. Effects of reducing temperatures on the consumption of reducing gas and the influence of H2/CO ratio on the energy utilization rate were also investigated. The calculation results show that the consumption of reducing gas decreases with increasing H2/CO ratio and temperature, and the energy utilization rate of the shaft furnace presents the same trend.


Gas-based shaft furnace Direct reduction Gas consumption Heat balance Mass balance 



The authors would like to express their thanks for the support by National Key R&D Program of China (2017YFB0304302-01).


  1. 1.
    Midrex Technologies, Inc. (2017) Available from:
  2. 2.
    You XM, Du T (1986) Energy Analysis and material balance of melt reduction process. In: China Metal Society Fourth Melt Reduction ConferenceGoogle Scholar
  3. 3.
    Yi LY (2013) Fundamental research on gas-based direct reduction of CO-H2 mixtures of iron ore pellets. Central South UniversityGoogle Scholar
  4. 4.
    Qin J (2008) Study on reduction characteristics and carbon behavior of DRI production in shaft furnace. Chongqing UniversityGoogle Scholar
  5. 5.
    Wang ZC (2013) Basic research on direct reduction process of coal gas-air shaft furnace. Dongbei UniversityGoogle Scholar
  6. 6.
    Zare Ghadi A, Valipour MS, Biglari M (2017) Int J Hydrogen Energy 42:103–118Google Scholar
  7. 7.
    Heinrich P (1991) Sintering and pelletizing, pp 30–34Google Scholar
  8. 8.
    Wu CB, Qin J, Gao Y et al (2008) The calculation and influencing factors of the minimum reduction gas amount of DRI in shaft furnace. In: National conference on metallurgical physics and chemistryGoogle Scholar
  9. 9.
    Huang XG (1981) Principles of steel and metallurgy. Metallurgical Industry PressGoogle Scholar
  10. 10.
    Lin ZQ (1977) The calculation method and application of reducing gas minimum requirement in the direct reduction process of shaft furnace. Ironmaking Steelmaking 3:91–97Google Scholar
  11. 11.
    Ye DL, Hu JH (2002) Thermodynamic data manual for inorganic substances. Metallurgical Industry PressGoogle Scholar
  12. 12.
    Fang J (2010) Non-blast furnace ironmaking process and theory. Metallurgical Industry PressGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • C. Y. Xu
    • 1
  • A. Y. Zheng
    • 1
  • J. L. Zhang
    • 1
    • 2
  • R. R. Wang
    • 1
  • Y. Li
    • 1
  • Y. Z. Wang
    • 1
  • Z. J. Liu
    • 1
    Email author
  1. 1.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingChina
  2. 2.School of Chemical EngineeringThe University of QueenslandSt LuciaAustralia

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