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Minimum ignition energy : Ethylene Glycol and water – 1.2 mJ.

The minimum ignition energy (MIE) of a hydrogen–air mixture is only 0.019 mJ, whereas that of other flammable gases such as petrol, methane, ethane, propane, butane, and benzene is usually on the order of 0.1 mJ ing to Lewis and von Elbe [1].

The purpose of the Minimum Ignition Energy (MIE) test is to determine the minimum energy of an electric spark needed to initiate a dust explosion. For dust handling purposes the MIE is mainly used to assess the hazards of ignition by electrostatic sparks or discharges.

The minimum ignition energy (MIE) of a hydrogen–air mixture is only 0.019 mJ, whereas that of other flammable gases such as petrol, methane, ethane, propane, butane, and benzene is usually on the order of 0.1 mJ ing to Lewis and von Elbe [1].

It can be shown that the minimum energy for ignition, based on supplying sufficient energy to the volume of mixture in the vicinity of the spark-gap to cause a stable flame, is Q p , min ∝ k 3 / p 2 u 1 3 This means that the minimum energy is increased as the inverse of the laminar flame speed cubed.

The minimum ignition energy of premixed gases has been calculated by using two theoretical expressions and compared with the experimental data. One expression considers the amount of energy that the minimal flame should have, and the other the heat loss from the surface of the minimal flamelet.

MIE typically range from 1 mJ to 1000 mJ [Janes]. The lower the MIE, the higher is the risk of explosion as a very small energy input can trigger a dust cloud explosion. MIE < 3 mJ should be processed with specific measures, the dust is extremely sensitive to ignition.