Gas explosions are destructive disasters in coal mines. Coal mine gas is a multi-component gas mixture, with methane (CH<sub>4</sub>) being the dominant constituent. Understanding the process and mechanism of mine gas explosions is of critical importance to the safety of mining operations. In this work, three flammable gases (CO, C<sub>2</sub>H<sub>6</sub>, and H<sub>2</sub>) which are commonly present in coal mines were selected to explore how they affect a methane explosion. The explosion characteristics of the flammable gases were investigated in a 20 L spherical closed vessel. Experiments on binary- (CH<sub>4</sub>/CO, CH<sub>4</sub>/C<sub>2</sub>H<sub>6</sub>, and CH<sub>4</sub>/H<sub>2</sub>) and multicomponent (CH<sub>4</sub>/CO/C<sub>2</sub>H<sub>6</sub>/H<sub>2</sub>) mixtures indicated that the explosion of such mixtures is more dangerous and destructive than that of methane alone in air, as measured by the explosion pressure. Furthermore, a self-promoting microcirculation reaction network is proposed to help analyze the chemical reactions involved in the multicomponent (CH<sub>4</sub>/CO/C<sub>2</sub>H<sub>6</sub>/H<sub>2</sub>) gas explosion. This work will contribute to a better understanding of the explosion mechanism of gas mixtures in coal mines and provide a useful reference for determining the safety limits in practice.
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