Extinction limits of catalytic combustion in micro-channels

Kaoru Maruta, Koichi Takeda, Jeongmin Ahn, Kevin Borer, Lars Sitzki, Paul D. Ronney, Olaf Deutschmann

Research output: Contribution to conferencePaper

2 Scopus citations

Abstract

The limits to self-sustaining catalytic combustion in a micro-scale channel were studied computationally using a cylindrical tube reactor. Methane-air mixtures with average velocities of 0.0375-0.96 m/sec were used. When the wall boundary condition was adiabatic, the equivalence ratio at the extinction limit monotonically decreased with increasing Re. In contrast, for non-adiabatic conditions, the extinction curve exhibited U-shaped dual limit behavior, i.e., the extinction limits increased/decreased with decreasing Re in smaller/larger Re regions, respectively. Diluting the mixture with N2 rather than oil, the fuel concentration and peak temperatures at the limit decreased substantially for mixtures with fuel/oxygen ratios even slightly rich of stoichiometric due to a transition from O coverage to CO coverage. No corresponding behavior was found for non-catalytic combustion. Exhaust gas recirculation rather than lean mixtures are preferable for minimizing flame temperatures in catalytic micro-combustors. Original is an abstract.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2002
Externally publishedYes
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: Jul 21 2002Jul 26 2002

Other

Other29th International Symposium on Combustion
CountryJapan
CitySapporo
Period7/21/027/26/02

ASJC Scopus subject areas

  • Engineering(all)

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    Maruta, K., Takeda, K., Ahn, J., Borer, K., Sitzki, L., Ronney, P. D., & Deutschmann, O. (2002). Extinction limits of catalytic combustion in micro-channels. Paper presented at 29th International Symposium on Combustion, Sapporo, Japan.