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ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

SUPERADIABATIC PARTIAL OXIDATION OF METHANE IN RECIPROCAL AND COUNTERBLOW POROUS BURNERS

Get access (open in a dialog) DOI: 10.1615/IHTC11.4430
pages 391-396

Sinopsis

This paper discusses experimental results of wave enhanced, filtration combustion of gaseous fuels in a porous medium. The intensive heat transfer between the heat releasing filtrating gas and high thermal capacity, porous medium (through the highly developed internal solid surface) results in energy accumulation in the solid body and in the so called superadiabatic effect, when the maximum gas temperatures in the porous combustor can significantly exceed the adiabatic temperature of the incoming gaseous fuel. In most of the experimental and theoretical work to date, the emphasis has been on the burning of very lean fuel/air mixtures. However, the same elevation of temperature occurs in the fuel rich regime. This effect can be exploited for a variety of applications. Thus, for very rich mixtures, ( Φ > 2 )', even a very small amount of oxidizer in such gaseous fuels as CH4 can support a reaction process associated with high temperature pyrolysis. hydrogen production and methane partial oxidation.
Two general cases were studied: 1) a reciprocal flow burner (RFB) in which the fuel flow direction of the unsteady-state combustion process is periodically switched from one end to the other and 2) a counter flow burner (CFB). This paper discusses the performance of these burners together with general thermodynamic calculations delineating the operating ranges for hydrogen production.