关键词:

等温热重法, 单颗粒, 煤焦, 本征反应速率常数

Abstract:

The combustion process of two kinds of single coal chars particle was studied by using the TGA method.The effect of mass transfer of gas, ash layer diffusion and inherent oxidation reaction resistances on the combustion process was investigated.An analysis method for single coal char particle combustion process and a new method determining inherent combustion reaction constant were established.It was found that the total resistance of combustion decreased with the combustion process.While the reaction approached the end, the total resistance of combustion reached a fixed value.At this point, combustion resistance was equal to inherent combustion reaction resistance, and thus the inherent kinetics constant was obtained.By experimental investigation under different air flow rates, temperatures or particle diameters, the consistency of this method was verified.The inherent combustion reaction constant and activation energy were measured with this method, and agreed well with the traditional method.

Key words:

等温热重法, 单颗粒, 煤焦, 本征反应速率常数