I want to figure out what pressure would need to be applied onto a 5% methane 95% air mixture to heat it up to the autoignition temp of 853 K.
Oops! A thousand pardons. I forgot to compare the lowering of LEL due to elevated temperature against the raising of LEL due to elevated pressure. Both are empirical formulas and I don't know their interaction (if any). Somewhere within the combustion engineering literature may be a graph showing both, but I believe it most likely your mixture WILL be explosive at that temperature.Thank you very much for the link. Looks like I will find some useful information in this source!