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采用非等温热重法对玉米芯热解半焦CO2气化行为和动力学特性进行研究。结果表明:升温速率对整个气化过程有重要影响。随着升温速率的增大,完成反应所需的温度提高,反应速率增加,反应时间缩短,而且升温速率越大,反应速率的峰值越高且向高温区偏移。利用Kissinger微分法和Coats-Redferm积分法分别计算动力学参数,所得不同升温速率下的平均活化能为180.77kJ/mol;升温速率越大,活化能越小。研究发现,玉米芯热解半焦CO2非等温气化的活化能E和频率因子A之间存在动力学补偿效应,两者满足lnA=0.09384E+2.604。
The non-isothermal thermogravimetric method was used to study the gasification behavior and kinetic characteristics of CO2 in the corn coke pyrolysis. The results show that: the heating rate has an important impact on the entire gasification process. With the increase of the heating rate, the temperature needed to complete the reaction increases, the reaction rate increases, the reaction time is shortened, and the higher the heating rate, the higher the peak of the reaction rate and the shift to the high temperature zone. Kinetic parameters were calculated by Kissinger differential method and Coats-Redferm integral method, respectively. The average activation energy at different heating rates was 180.77kJ / mol. The higher the heating rate, the smaller the activation energy. The study found that kinetic compensation effect exists between the activation energy E of non-isothermal gasification and the frequency factor A of corn coke pyrolysis semi-coke CO2, both of which satisfy lnA = 0.09384E + 2.604.