分段尝试法研究半焦/CO2气化反应过程动力学

为了深入了解半焦与CO₂的气化反应过程动力学,本文通过不同升温速率下的非等温实验,确定在不同阶段下富鼎半焦与CO₂的气化机理.采用分段尝试法研究富鼎半焦与CO₂气化反应过程动力学,确定反应过程前期与后期的机理函数分别为f(α)=(1-α)1-ψln(1-α)]1/2和f(α)=(3/2)(1-α)-1/3-1]-1,从而建立相应动力学模型,计算反应过程不同阶段的动力学参数.通过对不同阶段的动力学模型进行数据拟合,实验数据与模型吻合较好,相关系数都大于0.98.最后,根据求得的动力学参数,确定不同升温速率下活化能的补偿效应,即活化能与指前因子的关系式. 

A sectioning method to study the gasification reaction kinetics of semicoke with CO2

Non-isothermal experiments were carried out at different heating rates to further study the gasification reaction kinetics of semieoke with CO₂, and the gasification mechanisms of Fuding semicoke with CO₂ were confirmed in different stages. Then, it is reasonable to adopt a attempting method of subsection to study the gasification reaction kinetics and confirm the mechanism functions of the earlier and later periods in the reaction process, which are f(α)=(1-α)1-φ1n(1-α)]1/2 and f(α)=(3/2)(1-α)-1/3-1]-1, so the related kinetic parameters and corresponding dynamic models in different stages of the process are established. After data-fitting of the kinetic models in different stages, experimental data fit well with these models and the correlation coefficients are above 0.98. At last, according to the calculated kinetic parameters, it is clearly realized that there is compensatory effect for the activation energy at different heating rates, which is a relational expression between the activation energy and the pre-exponential factor.