Research on Inhibitory Effect of Mixed Suppressants CaCO, KCl, and KCO on Coal Dust Explosion Pressure

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, KCO has the greatest inhibitory effect on coal dust explosion, followed by KCl, and CaCO has the smallest effect. The KO, KO, and KOH generated by the thermal decomposition of KCO can also block the heat transfer of coal dust, playing a good role in suppressing explosions. The explosion suppression effect of mixing CaCO and KCO is better than that of mixing CaCO and KCl, and is worse than the explosion suppression effect of using KCO alone. The synergistic effect of KCl and KCO mixed explosion suppression makes the suppression effect better than using KCO alone. This is because KCl generates KO during pyrolysis, promoting the dynamic equilibrium of KCO explosion suppression process. This makes mixed explosion suppression more worthy of attention and adoption when considering purchase costs.