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

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

Energies, 2020, vol. 13, issue 19, 1-18

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.

Keywords: thermodynamic model; gas-based direct reduction ironmaking; gas utilization rate; CH 4 conversion; minimized Gibbs free energy principle; equilibrium state; heat needed; reaction enthalpy (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
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