Ambient Humidity Influence on Explosion Characteristics of Methane-Air Mixture

For the purpose of understanding the law of coal mine gas explosion, gas explosion characteristics under different ambient humidity conditions were experimentally determined, and the inhibition of water vapor on gas explosion is analyzed.The results show that when the premixed gas varies from dry state to saturation state, the upper and lower explosion limits decrease and increase by 0.31% and 0.11% respectively, and the explosion concentration range is reduced; the corresponding maximum explosion pressure and the maximum rate of pressure rise decay from 0.802 MPa and 23.38 MPa/s to 0.746 MPa and 18.59 MPa/s.The vapor components in premixed gas play an effective role in suppression of gas explosion.