Experimental assessment of dry water materials for inhibiting explosion under the coal gasification atmosphere

This study focused on the inhibitory effects of dry water materials on the coal dust explosion characteristics in the coal hydrogenation process by adopting a 20 l explosion device. Additionally, the inhibitory effects of dry water material were compared with SiO₂ and NH₄H₂PO₄. The results showed that 10 wt% dry water materials notably delay the arrival time of the peak explosion pressure, significantly inhibiting the initial energy release during the explosion, resulting in the maximum rate of explosion pressure rise decreasing by 61.96%. As the dry water material adds up to 50 wt%, the maximum explosion pressure significantly reduced to 0.258 MPa and delayed by 431.1 ms. The flame propagation velocity reduced from 2.19 to 0.33 m s^-1. In addition, dry water material, with its excellent heat absorption and adsorption and isolation properties, had more significant inhibitory effects than SiO₂ and NH₄H₂PO₄.