Effect of Oxygen Concentration on Homogeneous Ignition Point and Volatile Components of Bituminous Coal

The purpose of this study was to investigate the impact of oxygen concentration on the ignition of bituminous coal. Different oxygen concentrations and temperatures were used in the large-scale oxidation experiments to collect oxidized coals, which were then extracted with chloroform. And compare the critical ignition temperature of different mass samples. The liquid samples obtained were analyzed using GC-MS and Fourier transform infrared spectroscopy. Fourier transform infrared spectroscopy was also used to characterize the extracted oxidized coal. The results revealed that the critical ignition point of bituminous coal decreases by 216.38℃ when the mass sample increases from 5g to 300g. Furthermore, at the same temperature, an increase in oxygen concentration in the atmosphere was found to enhance the pyrolysis of bituminous coal. The oxidation activity of coal initially decreased and then increased with the temperature rise. The formation of ether bonds below 150℃ underwent oxidation and became exothermic above 175℃, which is the direct cause of coal seam fires.