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Flashback Propensity in Swirl Stabilized Burner With Syngas Fuels

[+] Author Affiliations
Bidhan Dam, Gilberto Corona, Ahsan Choudhuri

University of Texas at El Paso, El Paso, TX

Paper No. POWER2010-27237, pp. 43-48; 6 pages
doi:10.1115/POWER2010-27237
From:
  • ASME 2010 Power Conference
  • ASME 2010 Power Conference
  • Chicago, Illinois, USA, July 13–15, 2010
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-4935-4 | eISBN: 978-0-7918-3876-1
  • Copyright © 2010 by ASME

abstract

In swirl stabilized burner, combustion induced vortex breakdown (CIVB) flashback is a significant phenomenon. This paper presents experimental measurements of CIVB flashback propensity for hydrogen (H2 )-carbon monoxide (CO) flames. The effects of H2 concentration, and swirl number on the flashback propensity of H2 -CO flames are discussed. For a given air mass flow rate, the stoichiometric ratio (%F) at which the CIVB flashback occurs decreases with the increase in H2 concentration in fuel mixtures. However it appears that near the CIVB flashback limit, the swirl strength plays a more dominating role over the H2 concentration in the fuel mixture. The flashback propensity decreases with the increase in swirl number. An analysis of the nonreacting flow field (Air 6 g/s) as well as reacting (CH4 -Air and H2 -CO-Air) flame near the CIVB transient velocity field was conducted. The analysis revealed that a complex vortex-chemistry interaction leading to vortex breakdown and flashback occurred. The vector flow field showed that the high swirling flow generates a more stabilized and wider recirculation zone. It also showed that the presence of H2 dictates the intensity of the flashback process.

Copyright © 2010 by ASME
Topics: Fuels , Syngas

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