Abstract: Experimental study on the methane explosion effect of porous ceramics with distance of 30, 50, 70 cm from the ignition source and thickness of 2, 4 and 6 cm was carried out through an experimental platform built independently. The results showed that porous ceramics can prolong the propagation time of laminar flame and slow the transition of flame from laminar to turbulent. Quenching occurs when the explosive flame contacts the porous ceramic, and resulting in the termination of the explosive reaction. As the distance between porous ceramics and the ignition source increases or the thickness of porous ceramics increases, the flame front speed decreases, but the effect of thickness on the flame front speed is more obvious than that of the placement. The rate of overpressure rise decreases with the increase of distance between the porous ceramic and the ignition source. When the distance between the porous ceramic and the ignition source is 30 cm, the attenuation effect of overpressure is the best. The peak pressure of methane explosion overpressure decreases with the increase of thickness of porous ceramics.

Key words: gas explosion, porous ceramics, flame quench, explosion suppression