Analysis of Energy Consumption of the Reduction of Fe 2 O 3 by Hydrogen and Carbon Monoxide Mixtures

Guanyong Sun, Bin Li, Wensheng Yang, Jing Guo and Hanjie Guo
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Guanyong Sun: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Bin Li: School of Metallurgical and Ecological Engineering, 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
Jing Guo: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Hanjie Guo: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Energies, 2020, vol. 13, issue 8, 1-13

Abstract: Energy consumption is directly related to the energy supply and production costs of gas-based direct reduction ironmaking, which is an effective choice to reduce the energy consumption of iron making. In this paper, the minimum Gibbs free energy principle was used to calculate the equilibrium composition under the conditions of reduction gas consisting of hydrogen and carbon monoxide (hydrogen concentration of 0–100%, reduction gas amount of 0–6.0 mol, reduction temperature of 790–1100 °C, and 0.5 mol Fe 2 O 3 ). According to the enthalpy change, a simplified energy consumption model of a gas-based direct reduction ironmaking process was established, and the energy consumption per mole of metallic iron produced was calculated in detail. The following conclusions were drawn: at the stage when the reduction reaction occurred, the utilization rate of hydrogen or carbon monoxide remained unchanged with the increase in the amount of reduction gas or the increase in the hydrogen concentration of initial gas. The direct energy consumption increased with the increase in the hydrogen concentration at 790–980 °C and the opposite was true at 980–1100 °C. At 790–980 °C, the total energy consumption per ton of iron was greater than 0 and increased with the increase in initial hydrogen concentration from 40% to 100%, and it was less than 0 and increased with the increase in initial hydrogen concentration from 0% to 30%. It was possible to achieve zero total energy consumption with a hydrogen concentration of 30% and a 973 °C reduction.

Keywords: gas-based direct reduction ironmaking; gas utilization rate; energy consumption; energy utilization; recoverable heat; minimized Gibbs free energy principle; equilibrium state (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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