ABSTRACT

In order to better determine the spontaneous combustion tendency of coal, two types of heating rate methods, namely, single and multi-scan methods, commonly used in the field of spontaneous coal combustion are summarized based on a thermal analysis kinetics method. The single scanning rate method mainly included the Coats–Redfern, Achar, universal equation, MacCallum–Tanner, Madhusudanan–Krishnan–Ninan, and non-isothermal thermogravimetric and differential scanning calorimetric methods. The multi-scan rate method mainly included the Flynn–Wall–Ozawa, Kissinger–Akahira–Sunose, Starink, and Friedman methods. For each of these methods, their respective theoretical basis, advantages, and disadvantages were described. In addition, the Popesc and Malek methods were used to determine the optimal reaction kinetic model. In view of the compensation effect, the invariable activation energy E_inv and the pre-exponential factor lnA_inv at different heating rates were determined. For each method, the oxygen weight gain stage of Shaanxi bituminous coal was selected as an example interpretation.

摘要

为了更好地确定煤的自燃倾向，基于热分析动力学方法总结了煤自燃领域常用的两种加热速率方法，即单次扫描法和多次扫描法。单次扫描速率法主要包括Coats-Redfern、Achar、通用方程、MacCallum-Tanner、Madhusudanan-Krishnan-Ninan、非等温热重法和差示扫描量热法。多扫描速率方法主要包括Flynn-Wall-Ozawa、Kissinger-Akahira-Sunose、Starink 和Friedman 方法。对于这些方法中的每一种，都描述了它们各自的理论基础、优点和缺点。此外，Popesc 和Malek 方法用于确定最佳反应动力学模型。从补偿效果来看，确定了不同加热速率下的E _inv和指数前因子ln A _inv。每种方法均以陕西烟煤氧增重阶段为例进行说明。