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.