Significant casualties and property destruction resulted from pulverized coal explosion events, necessitating effective explosion inhibition strategies. To evaluate the inhibitory efficacy of calcium carbonate on pulverized coal explosions, parameters related to explosion suppression, oxidation-induced combustion, and microstructural characteristics of explosion residues were examined. The findings indicated that increasing calcium carbonate content progressively reduced the peak explosion pressure and rate of pressure rise. At a pulverized coal concentration of 300 g/m 3 , the optimal inhibitory dosage of calcium carbonate was identified as 562.5 g/m 3 . This optimal concentration exhibited a trend of initial increase followed by a decrease as pulverized coal concentration increased. The exothermal effect in the oxidation system comprising calcium carbonate and pulverized coal diminished with higher calcium carbonate loading, while thermal property parameters exhibited an upward trend. The adsorption of calcium carbonate on the surface of pulverized coal particles hindered heat and mass transfer between particles and the ambient environment, thereby limiting free radical participation in explosion chain reactions and effectively suppressing coal dust explosions. These results provide a fundamental experimental basis for developing advanced pulverized coal explosion mitigation methodologies.
Lu et al. (Sun,) studied this question.