Minimum ignition energy: Difference between revisions
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'''Minimum Ignition Energy (MIE)''' is the minimum amount of energy required to |
'''Minimum Ignition Energy (MIE)''' is the minimum amount of energy required to ignite a combustible vapor, gas or dust cloud, for example due to an [[electrostatic discharge]]. MIE is measured in [[joules]] (J). <ref> Pratt, Thomas H. "Electrostatic Ignitions of Fires and Explosions" Wiley-AIChE (July 15, 1997) Center for Chemical Process Safety </ref> |
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[[Explosive]]s, [[hydrogen]], [[unsaturated hydrocarbon]]s and [[alkane]]s in oxygen have the lowest MIE - range of {{e|-3}} to {{e|-1}} |
[[Explosive]]s, [[hydrogen]], [[unsaturated hydrocarbon]]s and [[alkane]]s in oxygen have the lowest MIE - range of {{e|-3}} to {{e|-1}} (mJ). Alkanes in air, distillate fuels, hybrid mixtures and extremely sensitive dusts have a MIE range of {{e|-1}} to {{e|1}} (mJ). Combustible dusts have a MIE range of {{e|1}} to {{e|4}} (mJ). |
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For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the [[lower flammable limit]] (LFL) and the [[upper flammable limit]] (UFL). <ref> [[National Fire Protection Association|NFPA]] 77 - 2007; page 20 </ref> |
For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the [[lower flammable limit]] (LFL) and the [[upper flammable limit]] (UFL). <ref> [[National Fire Protection Association|NFPA]] 77 - 2007; page 20 </ref> |
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Revision as of 00:49, 18 February 2009
Minimum Ignition Energy (MIE) is the minimum amount of energy required to ignite a combustible vapor, gas or dust cloud, for example due to an electrostatic discharge. MIE is measured in joules (J). [1]
Explosives, hydrogen, unsaturated hydrocarbons and alkanes in oxygen have the lowest MIE - range of ×10−3 to ×10−1 (mJ). Alkanes in air, distillate fuels, hybrid mixtures and extremely sensitive dusts have a MIE range of ×10−1 to ×101 (mJ). Combustible dusts have a MIE range of ×101 to ×104 (mJ).
For most materials, the lowest ignition energy value occurs at a concentration near the midpoint between those for the lower flammable limit (LFL) and the upper flammable limit (UFL). [2]