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Experimental and Numerical Investigation on the Laminar Flame Speed of CH4/O2 Mixtures Diluted With CO2 and H2O

[+] Author Affiliations
A. N. Mazas

Air Liquide, Jouy-en-Josas, France

D. A. Lacoste, T. Schuller

Ecole Centrale Paris, Chatenay-Malabry, France

Paper No. GT2010-22512, pp. 411-421; 11 pages
doi:10.1115/GT2010-22512
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

The effects of CO2 and H2 O addition on premixed oxy-fuel combustion are investigated with experiments and numerical simulations on the laminar flame speed of CH4 /O2 /CO2 /H2 O(v) and CH4 /O2 /N2 /H2 O(v) mixtures, at atmospheric pressure and for a reactants inlet temperature Tu = 373 K. Experiments are conducted with steady laminar conical premixed flames over a range of operating conditions representative of oxy-fuel combustion with flue gas recirculation. The relative O2 -to-CO2 and O2 -to-N2 ratios, respectively defined as O2 /(O2 +CO2 ) (mol.) and O2 /(O2 +N2 ) (mol.), are varied from 0.21 to 1.0. The equivalence ratio of the mixtures ranges from 0.5 to 1.5, and the steam molar fraction in the reactive mixture is varied from 0 to 0.45. Laminar flame speeds are measured with the flame area method using a Schlieren apparatus. Experiments are completed by simulations with the PREMIX code using the detailed kinetic mechanism GRI-mech. 3.0. Numerical predictions are found in good agreement with experimental data for all cases explored. It is also shown that the laminar flame speed of CH4 /O2 /N2 mixtures diluted with steam H2 O(v) features a quasi-linear decrease when increasing the diluent molar fraction, even at high dilution rates. Effects of N2 replacement by CO2 in wet reactive mixtures are then investigated. A similar quasi-linear decrease of the flame speed is observed for CH4 /O2 /CO2 H2 O-diluted flames. For a similar flame speed in dry conditions, results show a larger reduction of the burning velocity for CH4 /O2 /N2 /H2 O mixtures than for CH4 /O2 /CO2 /H2 O mixtures, when the steam molar fraction is increased. Finally, it is observed that the laminar flame speed of weakly (CO2 , H2 O)-diluted CH4 /O2 mixtures is underestimated by the GRI-mech 3.0 predictions.

Copyright © 2010 by ASME

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