Thermogravimetric experiments on Ximeng lignite and Indonesia lignite were carried out

and the results were compared with that of the Datong bituminous coal

Pingdingshan bituminous coal

Shenhua low ash bituminous coal and Yangquan anthracite.By analyzing the TG and DTG curves

the whole process from coal oxidation to coal combustion could be divided into six stages:physical adsorption

water evaporation with losing weight

absorption of oxygen with increasing weight

thermal decomposition

combustion and burning out.The characteristic temperatures of each stage were obtained.The results show that

the tendency of spontaneous combustion of the above two lignite was significantly obvious than that of the other four bituminous coal and anthracite.Coats-Redfern integral method was used to analyze the samples' oxidative combustion dynamic characteristics.Moreover

activation energy of the six coal samples was calculated to analyze the tendency of spontaneous combustion of coal.The calculation results show that

the oxidation process of the six coal samples belonged to the first-order reaction

and the tendency of spontaneous combustion of the two lignite coal was greater.The tendency of spontaneous combustion of Ximeng lignite was affected by particle size and oxygen density.Analysis shows that:the smaller the particle size

the stronger the tendency of spontaneous combustion;the greater the oxygen density

the stronger the tendency of spontaneous combustion in general.