Aluminum Dust Explosion Suppression Performance and Mechanism of a New Mesoporous Composite Explosion Suppressant

In this paper, using a 20 L spherical explosive device and a Hartmann device, we carried out explosion suppression experiments on 19 and 30 μm aluminum powders (500 g/m³) with different concentrations of the new explosive suppressants (MCM41@CS-APP) and CaCO₃ and elaborated on the suppression mechanism of the explosion of MCM41@CS-APP on aluminum powder. The experimental results show that when the concentration of the explosion suppressor is 50 g/m³, the maximum explosion pressure (P_max) produced by the explosion of mixed dust is higher than that of the explosion of aluminum powder, and with the increase of the concentration of the deflagration suppressant, the P_max of the mixed dust decreases. When the concentrations of MCM41@CS-APP and CaCO₃ reached 400 g/m³, the P_max of the mixed dust (Al = 19 μm) was 0.133 and 0.364 MPa, which decreased by 81.3% and 48.9%, respectively. The P_max of the mixed dust (Al = 30 μm) was not significant. Both detonation inhibitors inhibited the explosion of aluminum powder; the detonation duration of Al/MCM41@CS-APP is shorter; there are fewer aluminum particles in the product; and the initial oxidation temperature of aluminum powder is higher.