CO2 conversion and decarburization kinetics of CO2 gas and liquid Fe–C alloy at 1873 K
Wen-he Wu1,2, Rong Zhu1,2, Zhi-zheng Li1,2, Chun-yang Wang1,2, Guang-sheng Wei1,2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Research Center of Carbon Dioxide Science, University of Science and Technology Beijing, Beijing 100083, China
CO2 conversion and decarburization kinetics of CO2 gas and liquid Fe–C alloy at 1873 K
Wen-he Wu1,2, Rong Zhu1,2, Zhi-zheng Li1,2, Chun-yang Wang1,2, Guang-sheng Wei1,2
1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Research Center of Carbon Dioxide Science, University of Science and Technology Beijing, Beijing 100083, China
摘要 The reactions between CO2 gas and liquid Fe–C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results, thermodynamic equilibrium, and kinetic analysis. The average CO2 conversion is greater than 80% when the carbon content ranges from 4.0 to 1.0 wt.%. When the carbon content decreases from 0.5 to 0.1 wt.%, the average CO2 conversion diminishes from 83.50% to 40.84%. This proves that CO2 gas and liquid Fe–C alloy reaction does not reach equilibrium under experimental conditions compared with the calculated thermodynamic data. Through the kinetic analysis, it is shown that in the medium- to high-carbon liquid Fe–C alloys, the rate-controlling step involves CO2 gas mass transfer or mixed rate-controlling of CO2 gas mass transfer with adsorption and dissociation of CO2 gas. In contrast, in the low-carbon liquid Fe–C alloy, carbon mass transfer occurs in the molten alloy. The critical carbon content of the rate-controlling step transformation is 0.7937 wt.%.
Abstract：The reactions between CO2 gas and liquid Fe–C alloy with different initial carbon concentrations at 1873 K were investigated using experimental results, thermodynamic equilibrium, and kinetic analysis. The average CO2 conversion is greater than 80% when the carbon content ranges from 4.0 to 1.0 wt.%. When the carbon content decreases from 0.5 to 0.1 wt.%, the average CO2 conversion diminishes from 83.50% to 40.84%. This proves that CO2 gas and liquid Fe–C alloy reaction does not reach equilibrium under experimental conditions compared with the calculated thermodynamic data. Through the kinetic analysis, it is shown that in the medium- to high-carbon liquid Fe–C alloys, the rate-controlling step involves CO2 gas mass transfer or mixed rate-controlling of CO2 gas mass transfer with adsorption and dissociation of CO2 gas. In contrast, in the low-carbon liquid Fe–C alloy, carbon mass transfer occurs in the molten alloy. The critical carbon content of the rate-controlling step transformation is 0.7937 wt.%.
Wen-he Wu,Rong Zhu,Zhi-zheng Li, et al. CO2 conversion and decarburization kinetics of CO2 gas and liquid Fe–C alloy at 1873 K[J]. Journal of Iron and Steel Research International, 2022, 29(3): 425-433.
2022, Vol. 29 
