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Flashback Propensity of Syngas Fuels

[+] Author Affiliations
Bidhan Dam, Ahsan Choudhuri

University of Texas, El Paso, El Paso, TX

Paper No. POWER2009-81011, pp. 503-510; 8 pages
doi:10.1115/POWER2009-81011
From:
  • ASME 2009 Power Conference
  • ASME 2009 Power Conference
  • Albuquerque, New Mexico, USA, July 21–23, 2009
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-4350-5 | eISBN: 978-0-7918-3853-6
  • Copyright © 2009 by ASME

abstract

The paper presents experimental measurements of flashback propensity of H2 -CO mixtures (primary constituents of syngas fuels). Effects of H2 concentration, external excitation and swirl on the flashback propensity of H2 -CO flames are discussed. The flashback behavior of H2 -CO flames changes nonlinearly with the increase in H2 contents in the mixture. The critical velocity gradient (gF ) values of 5%–95% and 15%–85% H2 -CO mixtures somewhat agree with the scaling relation (gF = c(SL 2 /α)) and yield an average c value of 0.035. However, the gF values of 25%–75% H2 -CO mixture show higher order variations with the SL 2 /α ratio (especially for SL 2 /α < 19,000 s−1 ). At a lower SL 2 /α ratio, burner diameters have small effects on critical velocity gradient measurements; however, the effect is significant at higher SL 2 /α ratio. The effect of external excitation on the flashback propensity of H2 -CO flames with more than 5% H2 is not significant. Flashback through two mechanisms and their dependence on combustor parameters were also identified for swirl stabilized H2 -CO flames.

Copyright © 2009 by ASME
Topics: Fuels , Syngas

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