6th INTERNATIONAL SYMPOSIUM ON MINE SAFETY SCIENCE AND ENGINEERING

144 / 2023-06-30 09:06:48

Suppression effect of NaHCO3 on coal dust explosion

Coal dust explosion; Explosion suppression; Explosion suppression mechanism; Explosion suppression prediction model

To achieve precise explosion suppression of coal dust, explosion suppression experiments were conducted in a 20L spherical explosion test device. The optimal explosion concentration of coal dust was determined, and the coupling effects of NaHCO₃ concentration and particle size on the explosion suppression behavior of coal dust and its explosion evolution process were revealed. The results indicate that the optimal explosion concentration of coal dust is 1000g/m³, which results in the highest explosion pressure and longest explosion duration. It was also observed that higher NaHCO₃ concentrations and smaller particle sizes lead to better explosion suppression performance, while lower NaHCO₃ concentrations result in lower explosion suppression performance. Based on the coupling effects of NaHCO₃, the explosion overpressure of coal dust was analyzed, and a targeted explosion suppression prediction model for NaHCO₃-Coal dust was developed, achieving a goodness of fit of 0.95. Additionally, elemental characterization of the substances before and after the explosion was performed to explore the explosion suppression mechanism of NaHCO₃ on coal dust. The research findings provide a scientific basis for the prevention and mitigation of coal dust explosion disasters.