Research on the characteristics of coal dust explosion in mine cartridge filter based on numerical simulation

In the underground coal mine tunneling faces, cartridge filters are often used for dust removal. However, during the operation of the cartridge filter, there is a potential hazard of dust explosions as the internal dust concentration reaches a certain level. Based on the CFD numerical simulation method, this research established a dust explosion model in a mine cartridge filter to analyze the features of internal dust explosions under operational conditions. The influence of initial transport velocity and dust concentration on the coal dust explosions was revealed. The numerical simulation demonstrates that an increase in the initial transport velocity enhances turbulence intensity, leading to elevated peak explosion pressure and peak of pressure rise rate inside the cartridge filter, thereby intensifying the level of dust explosions hazard. The peak explosion pressure is higher in the 0–1 m section of the pipeline, and the 0.5 m of the air inlet pipe demonstrates the most pronounced negative pressure effect. In the settling chamber, the speed at which the flame propagates initially increases as the propagation distance grows. However, it gradually slows down due to the accumulating pressure effect. The flame tends to propagate from the air inlet pipe, and the propagation speed increases as the flame travels further along the pipe. This research provides theoretical guidance for designing explosion-proof systems and venting mechanisms for cartridge filter interiors and pipes.