Flame Propagation Characteristics of Deposited Coal Dust Explosion Driven by Airflow Carrying Coal Dust

To reveal the flame propagation characteristics of the deposited coal dust explosion driven by airflow carrying the coal dust, the horizontal glass tube explosion apparatus is used for experimental testing. The greater the degree of coal dust metamorphism, the smaller the propagation distance and duration of the explosion flame.The propagation distance and duration of the explosion flame first increase, then decrease as the weight of the deposited coal dust increases due to the limited space in the glass tube, local turbulence disturbance, and insufficient oxygen concentration. As the particle size of the deposited coal dust increases, the flame duration of lignite and long-flame coal decrease, but the flame duration of non-stick coal and gas coal increase. Inert rock dust effectively hinders the coal dust explosion, confirming that spreading inert rock dust around the tunnels effectively reduces the explosion of suspended and deposited coal dust.