煤系高岭岩中固定碳燃烧动力学特性

煤系高岭岩中可燃矿物与不可燃矿物的共生组合增加了可燃矿物燃烧的复杂性,研究这类"燃料"的燃烧特性对充分利用煤矸石资源有积极的意义。参照FCC催化剂结焦燃烧机理,基于一系列假设,建立了煤系高岭岩中固定碳燃烧反应模型—未反应收缩核模型。采用空气气氛下等温热重法研究了煤系高岭土中固定碳的燃烧反应。研究表明,低于700℃,反应的控制步骤是煤系高岭岩中固定碳燃烧界面化学反应。通过对非均一颗粒体系的未反应核收缩模型计算分析,获得煤系高岭岩中固定碳燃烧反应动力学参数,活化能(E)为100.12kJ/mol,频率因子(A)为2.27×106s-1。

Combustion kinetics characteristics of fixed carbon in coal series kaolinite

Coal series kaolinite is a kind of rock and a paragenetic mineral of coal. This mineral paragenesis increases the complexity of combustion of coal in kaolinite. Therefore, it is necessary to study its combustion characteristics, which is of positive significance to make good use of coal gangue resource. Taking the combustion mechanism of coke in FCC catalyst as reference, an unreaction shrinking core model for fixed carbon combustion reaction in kaolinite particle was established based on a series of hypothesis. The combustion of fixed carbon in coal series kaolinite was conducted by using an isothermal thermogravimetric method in air atmosphere. Results clearly show that the control step of fixed carbon combustion process below 700℃ is the interface combustion reaction. By means of the unreaction shrinking core model analysis and calculation of unhomogeneous particle system, the combustion kinetics parameters for fixed carbon combustion in coal series kaolinite are obtained, the value of activation energy (E) is 100.12kJ/mol, and the frequency factor (A) is 2.27×10⁶s^-1.