Gas-phase and catalytic combustion in heat-recirculating burners

Jeongmin Ahn, Craig Eastwood, Lars Sitzki, Paul D. Ronney

Research output: Contribution to conferencePaper

Abstract

An experimental study of a spiral counterflow "Swiss roll" burner was conducted, emphasizing on determination of extinction limits and comparison of results with and without bare-metal Pt catalyst. A wide range of Reynolds numbers (Re) was tested using propane-air mixtures. With catalyst, combustion could be sustained at Re ≥ 1.2 with peak temperatures ≥ 350 K. A heat transfer parameter characterizing the thermal performance of both gas-phase and catalytic combustion at all Re was identified. At low Re, the lean extinction limit was actually rich of stoichiometric and rich-limit had equivalence ratios exceeded 40 in some cases. No corresponding behavior was observed without catalyst. Gas-phase combustion generally occurred in a flameless mode near the burner center. At low Re, even in extremely rich mixtures, CO and non-propane hydrocarbons did not form. For higher Re, where both gas-phase and catalytic combustion could occur, catalytic limits were slightly broader but had much lower limit temperatures. At sufficiently high Re, catalytic and gas-phase limits merged. Thus, combustion at low Re in heat-recirculating burners benefited greatly from catalytic combustion with the proper choice of mixtures that are different from those preferred for gas-phase combustion.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2004
Externally publishedYes
Event30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Other

Other30th International Symposium on Combustion, Abstracts of Symposium Papers
CountryUnited States
CityChicago, IL
Period7/25/047/30/04

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Ahn, J., Eastwood, C., Sitzki, L., & Ronney, P. D. (2004). Gas-phase and catalytic combustion in heat-recirculating burners. Paper presented at 30th International Symposium on Combustion, Abstracts of Symposium Papers, Chicago, IL, United States.