ABSTRACT

In order to explain the influence of the coal ash on the combustion characteristics of coal, the physical and chemical structures of pulverized coal with different ash contents were compared and analyzed, and the combustion characteristics and kinetics of pulverized coal were systematically studied by non-isothermal thermogravimetric analysis. The results show that the physical and chemical structure of the deashed coal is not significantly changed compared with the raw coal. The combustion process of the deashed coal gradually moves to the high temperature zone, and the combustion performance is obviously weakened. The comprehensive combustion characteristic parameters of the three samples can be arranged as: raw coal > primary deashed coal > secondary deashed coal. In this study, the RNGM model was used to analyze the combustion kinetics of pulverized coal, and the fitting effect is good. And there is a significant kinetic compensation effect in the combustion process. After calculation, the activation energy value of the samples is between 16.15~29.51 kJ/mol. The RNGM model can effectively characterize the various stages of the combustion reaction and validate the experimental results.

摘要

为阐明煤灰对煤燃烧特性的影响，对比分析了不同灰分煤粉的物理化学结构，采用非等温方法系统研究了煤粉的燃烧特性和动力学。热重分析。结果表明，脱灰煤的物理化学结构与原煤相比没有明显变化。脱灰煤燃烧过程逐渐向高温区移动，燃烧性能明显减弱。三种样品的综合燃烧特性参数可排列为：原煤>一次脱灰煤>二次脱灰煤。在这项研究中，RNGM模型用于煤粉燃烧动力学分析，拟合效果良好。并且在燃烧过程中具有显着的动力学补偿作用。经计算，样品的活化能值在16.15~29.51 kJ/mol之间。RNGM模型可以有效地表征燃烧反应的各个阶段并验证实验结果。