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

Tianqi Liu; Kenan Liu

doi:10.1038/s41598-024-58017-7

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

Sci Rep. 2024 Mar 27;14(1):7324. doi: 10.1038/s41598-024-58017-7.

Authors

Tianqi Liu¹, Kenan Liu²

Affiliations

¹ School of Safety Engineering, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China. ltq613@163.com.
² School of Safety Engineering, Shenyang Aerospace University, Shenyang, 110136, Liaoning, China.

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, K₂CO₃ has the greatest inhibitory effect on coal dust explosion, followed by KCl, and CaCO₃ has the smallest effect. The K₂O, K₂O₂, and KOH generated by the thermal decomposition of K₂CO₃ can also block the heat transfer of coal dust, playing a good role in suppressing explosions. The explosion suppression effect of mixing CaCO₃ and K₂CO₃ is better than that of mixing CaCO₃ and KCl, and is worse than the explosion suppression effect of using K₂CO₃ alone. The synergistic effect of KCl and K₂CO₃ mixed explosion suppression makes the suppression effect better than using K₂CO₃ alone. This is because KCl generates K₂O during pyrolysis, promoting the dynamic equilibrium of K₂CO₃ explosion suppression process. This makes mixed explosion suppression more worthy of attention and adoption when considering purchase costs.

Keywords: Coal dust; Explosion suppressant; Inhibition effect; Maximum pressure.