Pressure dependence of the auto-ignition temperature of methane/air mixtures

The results of experiments conducted to determine the auto-ignition temperature (AIT) and the cool flame temperature (CFT) of methane/air mixtures at elevated pressures (200–4700 kPa) and for concentrations from 30 up to 83 vol.% are reported. The experiments were performed in a closed spherical ves...

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Bibliographic Details
Published in:Journal of hazardous materials 1999-03, Vol.65 (3), p.233-244
Main Authors: Caron, M, Goethals, M, De Smedt, G, Berghmans, J, Vliegen, S, Van't Oost, E, van den Aarssen, A
Format: Article
Language:English
Subjects:
Applied sciences
Auto-ignition
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Explosion limits
ignition
Methane
pressure
Safety
Theoretical studies. Data and constants. Metering
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Summary:The results of experiments conducted to determine the auto-ignition temperature (AIT) and the cool flame temperature (CFT) of methane/air mixtures at elevated pressures (200–4700 kPa) and for concentrations from 30 up to 83 vol.% are reported. The experiments were performed in a closed spherical vessel with a volume of 8 dm 3. It is shown that methane/air mixtures can react spontaneously for methane concentrations far outside the flammability limits. Cool flames are observed for methane concentrations higher than 40 vol.%. The AIT and CFT are strongly pressure-dependent and decrease with increasing pressures. A Semenov correlation is developed for the CFT as a function of the pressure. The upper explosion limit (UEL) of methane/air mixtures at elevated pressure and temperature is linked with the CFT. It is shown that for certain conditions of pressure and temperature, the flammability range increases considerably even for a small temperature rise.
ISSN:0304-3894
1873-3336
DOI:10.1016/S0304-3894(99)00004-7