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Flashback Arrestor for Lean Premixed, Prevaporized, Low NOx Combustors FREE

[+] Author Affiliations
Gil Kraemer

Precision Combustion Inc., New Haven, CT

Chi-Ming Lee

NASA Lewis Research Center, Cleveland, OH

Paper No. 98-GT-596, pp. V003T06A058; 11 pages
doi:10.1115/98-GT-596
From:
  • ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Stockholm, Sweden, June 2–5, 1998
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7864-4
  • Copyright © 1998 by ASME

abstract

Lean premixed, prevaporized (LPP) high temperature combustor designs as explored for Advanced Subsonic Transport (AST) and High Speed Civil Transport (HSCT) combustors can achieve low NOx emission levels. An enabling device is needed to arrest flashback and inhibit autoignition at high power conditions and during transients (surge and rapid spool down). A novel flashback arrestor design has demonstrated the ability to arrest flashback and inhibit downstream flame holding in a 4.6 cm diameter tubular reactor at full power inlet temperatures (725 °C) using Jet-A fuel at 0.4 ≤ ϕ ≤ 3.5. Several low pressure loss (0.2% to 0.4% at 30 m/s) flashback arrestor designs were developed which arrested flashback at all of the test conditions. Flame holding was also inhibited off the flash arrestor face or within the downstream tube at low velocities (≤ 3 to 6 m/s), thus protecting the flashback arrestor and combustor premixer components. Upstream flow conditions influence the specific configuration based on using either a 45% or 76% upstream geometric blockage. Stationary, lean premixed dry low NOx gas turbine combustors would also benefit from this low pressure drop flashback arrestor design which can be easily integrated into new and existing designs.

Copyright © 1998 by ASME
This article is only available in the PDF format.

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