Research on inhibitory effect of mixed suppressants CaCO3, KCl, and K2CO3 on coal dust explosion pressure

Abstract To discuss the inhibitory effect of micrometer scale coal dust explosion pressure, three types of explosion suppressants are selected for mixed explosion suppression. The results indicate that the coal dust explosion process includes three stages: accelerated and decelerated energy release, as well as energy dissipation. When using explosive suppressants, K 2 CO 3 has the greatest inhibitory effect on coal dust explosion, followed by KCl, and CaCO 3 has the smallest effect. The K 2 O, K 2 O 2 , and KOH generated by the thermal decomposition of K 2 CO 3 can also block the heat transfer of coal dust, playing a good role in suppressing explosions. The explosion suppression effect of mixing CaCO 3 and K 2 CO 3 is better than that of mixing CaCO 3 and KCl, and is worse than the explosion suppression effect of using K 2 CO 3 alone. The synergistic effect of KCl and K 2 CO 3 mixed explosion suppression makes the suppression effect better than using K 2 CO 3 alone. This is because KCl generates K 2 O during pyrolysis, promoting the dynamic equilibrium of K 2 CO 3 explosion suppression process. This makes mixed explosion suppression more worthy of attention and adoption when considering purchase costs.