Minimum Ignition Energy and Coupling Coefficient of Methane-Air Mixture and Its Application

Testing non-metallic materials are of great value to mining industry.The MIE (Minimum Ignition Energy) characterize the danger of a kind of combustible gas and its ignition.We calculated the MIE of the ignition system which can be used to test the antistatic property of the mine using materials.According to the structure of the antistatic property testing system, a method to calculate the electromagnetic energy of the ignition system was presented, and according to the MIE and electromagnetic energy before ignition, the quantity of triboelectric charge was obtained, as well as the threshold value of ignition energy coupling coefficient and the threshold value of quantity of triboelectric charge.The results shows that the threshold value of ignition energy coupling coefficient decreases as voltage grows, grows as the electrode distance gets wider.Familiar to the variation of ignition energy coupling coefficient, the threshold value of quantity of triboelectric charge grows as the electrode distance gets wider.For the system described in this paper, the threshold increases from 0.416 3 to 0.769 1 when the distance increases from 1 mm to 5 mm.This study puts forward to the test way to non-metallic materials and provides reference to setting safty standard concerns.