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