Abstract:
In order to master the fire-extinguishing efficiency of different concentrations of CO
2 on the oxidized coal re-combustion, a self-developed coal spontaneous oxidation program temperature increasing experimental device was adopted to study the inhibitory effect of CO
2 on coal oxidation and heating process, and the samples of Pingdingshan No.8 Coal Mine were fed with CO
2 concentrations of 10 %, 20 %, 30 % and 40 % respectively.The oxygen consumption rate, the production rate of CO and the change law of apparent activation energy of coal were measured, and the result shows that different volume fractions of CO
2 have inhibitory effects on the heating process of coal oxidation.The results show that different volume fractions of CO
2 have an inhibitory effect compared with the oxidation under pure air conditions.At the same time, the larger the volume fraction of CO
2 introduced, the lower the oxygen consumption and CO generation rate both the primary and secondary coal oxidation process, while the higher the apparent activation energy.That is to say, the larger the volume of CO
2, the better the inhibition efficiency of the re-combustion process of oxidized coal.