What is the relationship between the autoignition temperature and the minimum ignition energy of flammable media?
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I’ve looked through many books, but it seems none of them mention this concept at the same time; what exactly is the connection between the two?
This post was last edited by zhanyl628 on 2019-7-10 10:01. There is no inevitable connection between the two. The autoignition point is the lowest temperature at which a combustible material will catch fire and burn when heated in an oxidizing gas, in the absence of an external ignition source. Minimum ignition energy refers to the smallest spark energy required to cause a dust cloud, flammable gas, or its combustible mixture to burn or explode. Neither is an inherent constant of matter. The scope of application for the two is different; the former emphasizes the absence of external sources of fire, while the latter focuses on spark energy, that is, ignition.
For this, you need to look at the textbooks for fire engineers; they contain annotations. Let me elaborate a bit – what’s emphasized more naturally is the temperature, namely the temperature at which it burns on its own ； The minimum ignition energy is in joules, which is a unit of heat and represents the energy required from the outside to ignite a substance. I hope this can help you.