Abstract：Using programmed heating experiment system,the programmed heating experiments of coal sample with different particle size from 24305 and 25301 working face of Shaqu Colliery were carried out. Tests were performed for the study of the generation law of gases such as O₂,CO,CO₂,CH₄,C₂H₄,C₂H₆,C₃H₈in the process of coal oxidation heating up,and the oxygen consumption rate and determination index of spontaneous combustion tendency were calculated with different particle size. The results show that the smaller the particle size of coal sample,the stronger the adsorption capacity of oxygen and the greater the oxygen consumption;with the increase of coal temperature,the oxygen consumption velocity and index gas concentration of coal sample with different particle size increase from slowly to rapidly; the smaller the particle size of coal sample,the lower the critical temperature of coal sample and dry temperature,the stronger the spontaneous combustion of coal.

Keyword：particle size;oxidation heating up;index gas;coal spontaneous combustion;