I am attempting to calculate the flammability limits of several gaseous mixtures containing hydrocarbons, hydrogen, inerts and oxygen all at high pressures of around 100 bar. It appears there is a simple (but proven) Le Chatalier's Law which can be used to calculate LEL and UEL for these mixtures at atmospheric pressure, but could someone tell me how this would be adapted for the mixtures at 100 bar and where I can find data for LEL/UELs of flammable gases at 100 bar?
The attached paper deals with the calculation of UEL at high pressures. Maybe it will help. The second attachment have information about UEL/LEL of different gases. I am not sure if that is at a high enough pressure though. I think the materials maybe a good place to start. All the best.
Our research group has performed experiments in this area in the past. Please see the attached.
One way would be to use chemical-kinetic mechanisms to calculate flame speeds (laminar burning velocity), start with less dilution and then add back the diluent until flame speeds drop rapidly off. There is some uncertainty regarding higher hydrocarbons, other uncommon species, and high pressures, but it is probably the most intellectually consistent method.
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