煤焦加压气化反应性研究

CO_2 gasification reactivity of coal char at elevated pressure

利用加压热分析仪,测定了义马煤焦的CO2气化反应性。结果表明:随温度的提高,义马煤焦的反应性和反应速度呈增加趋势,与前期研究常压下的情况一致;压力对气化反应的促进作用不明显,且温度对气化过程的影响大于压力;反应速率在初始阶段最大,随后逐渐减小。经过动力学计算表明:反应速率与温度的关系符合Arrhen ius定律;反应级数随温度增加而减小,近似于线性关系;煤焦活化能大约为60.02 kJ/mol。

The CO2 gasification reactivity of Yima coal chars was investigated by pressurized thermo gravimetric analyzer.The results show that the gasification reactivity and rate increase with elevating temperature,which accords with the preliminary studies under atmospheric condition.Elevated pressure is beneficial to gasification reactivity,and the influence of temperature is stronger than that of pressure.The reaction rate is fast at initial stage and then declined.Kinetic parameters were discussed.The relationship between reaction rate and temperature is consistent with Arrhenius law.Reaction order decreases when temperature increases,and the relationship is close to linear.The activation energy of coal char is about 60.02 kJ/mol.