首页|Effect of Temperature on Reaction and Degradation Behaviors during CO_2 and H_2O Gasification Reactions of Coke in Same Conversion Ratio
Effect of Temperature on Reaction and Degradation Behaviors during CO_2 and H_2O Gasification Reactions of Coke in Same Conversion Ratio
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The efficiency of blast furnaces is adversely affected by coke degradation via gasification. Considering the utilization of hydrogen-enriched blast furnaces, it is essential to investigate the reaction and degradation behaviors of coke at different temperatures. In this study, coke gasification experiments were conducted under CO_2 and H_2O atmospheres at different temperatures to prepare cokes with a conversion ratio of 0.2. The reaction rate of the H_2O gasification reaction was higher than that of the CO_2 gasification reaction at the same temperature. The activation energies for CO_2 and H_2O gasification were 150.2 and 126.0 kJ/mol, respectively. After gasification, the shrinkage ratio was low by H_2O gasification at 1 273 K and increased with increasing temperature, indicating that the surface reaction became the control factor that consumed the coke matrix with increasing temperature. On the other hand, the shrinkage ratio by CO_2 gasification tended to be stable from 1 273 to 1 673 K. Furthermore, the increase in the porosity of coke by H_2O gasification was lower than that by CO_2 gasification at higher temperatures. In addition, the strength of the coke via H_2O gasification was higher than that of the coke via CO_2 gasification.
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