Study on the Effect of KHCO3 Particle Size and Powder Spraying Pressure on the Methane Explosion Suppression Characteristics of Pipe Networks

To achieve the best explosion suppression effect of an active powder spraying system, the KHCO3 powder suppression test for a 9.5% methane-air premixed methane explosion was studied based on an independent test platform consisting of a pipe network. The suppression effect of KHCO3 powder particle size and powder spraying pressure on the methane explosion shock wave pressure, flame wave velocity, and flame wave temperature were studied, and the explosion suppression mechanism was analyzed. The results indicated that both the particle size of the KHCO3 powder and powder spraying pressure had a significant effect on the explosion inhibition. When the spraying pressure was in the range of 0.1-0.2 MPa, the increase in KHCO3 powder spraying pressure on the effect of explosion suppression was significantly enhanced, and when the powder spraying pressure exceeded 0.2 MPa, the explosion suppression effect did not obviously increase. With a reduction in the KHCO3 powder particle size, the effect of explosion suppression significantly improved, and when the KHCO3 powder particle size was reduced to 50-75 mu m, we observed the best shock wave pressure, flame wave velocity, and flame wave temperature suppression effect.