Study on thermal reaction kinetics of long flame coal spontaneous combustion in Tangjiahui Mine

In order to effectively prevent and control coal spontaneous combustion disasters in Tangjiahui Mine, thermogravimetric experiments were used to analyze the thermal reaction kinetics characteristics of coal samples at different heating rates and different oxygen volume fractions. The results showed that at the same oxygen volume fraction, the apparent activation energies of coal at heating rates of 2 ℃/min, 5 ℃/min, 10 ℃/min were 150.27 kJ/mol, 131.97 kJ/mol, 106.86 kJ/mol, respectively; in addition, at the same heating rate, the apparent activation energies of coals with oxygen volume fraction of 6%, 9%, 12%, 15%, 18%, 21% are 106.86, 120.61, 127.31, 131.58, 135.26 and 136.82 kJ/mol, respectively. The apparent activation energies decrease with the increase of heating rate and oxygen volume fraction, and the change law is basically in line with the increase of logarithmic function. The calculation results of activation energy kinetics reveal that the degree of coal-oxygen composite reaction is different under different heating rates and different oxygen volume fractions.