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: When flammable gases are mixed with air or oxygen in the explosion concentration range and are ignited by sufficiently large ele-ctrostatic discharge energy, they may explode causing severe disaster in workplace. The minimum ignition energy(MIE) of single gas-air mix-tures has been already investigated by many research, but the MIE of mixtures of more than ternary gas mixture is not examined yet. The pur-pose of this study is to investigate the MIE of a ternary gas(methane, ethylene, hydrogen, propane) mixtures experimentally. The results of our experiment show that the ignition of a methane-ethylene-air, methane-hydrogen-air, methane-propane-air, ethylene-hydrogen-air, ethy-lene-propane-air and hydrogen-propane-air mixture due to electrostatic discharge energy primarily depends on that the mixture: the MIE decreases gradually with the increase of having the lower MIE than other mixture ratio in the normal atmospheric pressure. Key Words : minimum ignition energy(MIE), ternary gas mixture

Measurement of Minimum Ignition Energy by Electrostatic Discharge for Flammable Ternary Gas Mixtures