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Under certain conditions the explosion limits of combustible gases mixed with air are constants. But with the environment conditions or the mixed gases parameter change and even with ignition type differing, the explosion limits will be different. In general the lower explosion limits of combustible gas mixture decrease with the environment rising, contrarily the upper explosion limits increase. This experiment system is build based on the GB/T 12474-90.The main equipment is designed resistant to 600°C,and the electronic ignition system is replaced by a plane of heater. In this experiment four kinds of gas are involved and two equations for methane and carbon monoxide are proposed. The following discussion also involves the phenomenon and the rule of lower explosion limits expansion in normal press and high temperature based on experimental data

The Research on Combustible Gas Lower Limit of Explosion Expanding in High Temperature