Experimental Investigation of Laminar Flame Speeds for Medium Calorific Gas with Various Amounts of Hydrogen and Carbon Monoxide Content at Gas Turbine Temperatures

Ivan Sigfrid, Ronald Whiddon, Robert Collin, Jens Klingmann

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceedingpeer-review

Abstract

It is expected that, in the future, gas turbines will be operated on gaseous fuels currently unutilized. The ability to predict the range of feasible fuels, and the extent to which existing turbines must be modified to accommodate these fuels, rests on the nature of these fuels in the combustion environment. Understanding the combustion behavior is aided by investigation of syngases of similar composition. As part of an ongoing project at the Lund University Departments of Thermal Power Engineering and Combustion Physics, to investigate syngases in gas turbine combustion, the laminar flame speed of five syngases (see table) have been measured. The syngases examined are of two groups. The first gas group (A), contains blends of H-2, CO and CH4, with high hydrogen content. The group A gases exhibit a maximum flame speed at an equivalence ratio of approximately 1.4, and a flame speed roughly four times that of methane. The second gas group (B) contains mixtures of CH4 and H-2 diluted with CO2. Group B gases exhibit maximum flame speed at an equivalence ratio of 1, and flame speeds about 3/4 that of methane. A long tube Bunsen-type burner was used and the conical flame was visualized by Schlieren imaging. The flame speeds were measured for a range of equivalence ratios using a constrained cone half-angle method. The equivalence ratio for measurements ranged from stable lean combustion to rich combustion for room temperature (25 degrees C) and an elevated temperature representative of a gas turbine at full load (270 degrees C). The experimental procedure was verified by methane laminar flame speed measurement; and, experimental results were compared against numerical simulations based on GRI 3.0, Hoyerman and San Diego chemical kinetic mechanisms using the DARS v2.02 combustion modeler. On examination, all measured laminar flame speeds at room temperature were higher than values predicted by the aforementioned chemical kinetic mechanisms, with the exception of group A gases, which were lower than predicted.
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2010, GT2010-22275
PublisherAmerican Society Of Mechanical Engineers (ASME)
Pages173-181
Number of pages9
VolumeVolume 2: Combustion, Fuels and Emissions, Parts A and B
ISBN (Print)978-0-7918-4397-0
DOIs
Publication statusPublished - 2010
EventASME Turbo Expo 2010: Power for Land, Sea, and Air - Glasgow, United Kingdom
Duration: 2010 Jun 142010 Jun 18

Publication series

Name
VolumeVolume 2: Combustion, Fuels and Emissions, Parts A and B

Conference

ConferenceASME Turbo Expo 2010: Power for Land, Sea, and Air
Country/TerritoryUnited Kingdom
CityGlasgow
Period2010/06/142010/06/18

Subject classification (UKÄ)

  • Energy Engineering
  • Atom and Molecular Physics and Optics

Free keywords

  • hydrogen
  • syngas
  • laminar flame speed
  • stretch
  • combustion

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