非等温热重分析研究煤焦气化动力学

Char gasification kinetics using non-isothermal TGA

使用等温法和非等温法热重分析研究了神府煤焦气化反应动力学.在非等温法中,Doyle和Coats-Redfern近似函数都可以模拟煤焦气化反应过程,两种函数在不同的升温速率下得到了与等温法相近的E值.对比两个函数拟合实验数据的相关系数,确定在非等温热重分析中使用Coats-Redfern函数在15℃/m in的升温速率下求取煤焦气化反应动力学参数是一种既简便又准确的方法.

The gasification kinetics in CO2 of Shenfu char was investigated using both isothermal and non-isothermal TGA. In non-isothermal TGA, Doyle and Coats- Redfern approximate equations can be used to simulate char gasification behaviors. Comparing with E obtained via isothermal TGA, two approximations obtained the best yield at different heating rates, respectively. After comparing correlation coefficient of approximate simulations, it is found that the optimum method to calculate gasification kinetics parameters is using Coats-Redfern approximation in non-isothermal TGA and at a heating rate of 15 ℃/min.