Micromechanism of the Initiation of a Multiple Flammable Gas Explosion

To investigate the micromechanism of a multiple flammable gas explosion, CH4, CO, C2H6, C2H4, and H2 were selected to determine the thermodynamic and dynamic characteristics of the gas mixture explosion using Gaussian software. The initiation mechanism and primary initiation pathway of the joint explosion of the five combustible gases were analyzed. A spherical experimental device for gas/dust explosions combined with a system for spectral measurements was implemented to obtain emission spectra of the ·H radical and CH2O during the gas mixture explosion process. The oxidation reaction of CH4 initiated the chain reaction for the entire explosive reaction rather than the CO/C2H6/C2H4/H2 mixture at the ignition moment of the explosion. Nevertheless, addition of the CO/C2H6/C2H4/H2 mixture had obvious effects on the chain-branching reactions of the CH4 explosion. The ·CH3 radicals produced during methane oxidation induced a hydrogen reaction, and ·H radicals generated in the reaction of ·CH3 and H2 triggered ...