Effect of CO2 dilution on structures of premixed syngas/air flames in a gas turbine model combustor
(2023) In Combustion and Flame- Abstract
- The impact of CO dilution on combustion of syngas (a mixture of H2, CO, and CH4) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild dilution levels of CO2, corresponding to 15% and 34% of CO2 mole fraction in the syngas/CO2 mixtures, were experimentally investigated to evaluate the effects of CO2 dilution on the flame structures and the emissions of CO and NOx. All experiments were performed at a constant Reynolds number (Re = 10000). High-speed flame luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements of the OH radicals and particle image velocimetry (PIV) were employed for qualitative and... (More)
- The impact of CO dilution on combustion of syngas (a mixture of H2, CO, and CH4) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild dilution levels of CO2, corresponding to 15% and 34% of CO2 mole fraction in the syngas/CO2 mixtures, were experimentally investigated to evaluate the effects of CO2 dilution on the flame structures and the emissions of CO and NOx. All experiments were performed at a constant Reynolds number (Re = 10000). High-speed flame luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements of the OH radicals and particle image velocimetry (PIV) were employed for qualitative and quantitative assessment of the resulting flame and flow structures. The main findings are: (a) the operability range of the syngas flames is significantly affected by the CO2 dilution, with both the lean blowoff (LBO) limit and the flashback limit shifting towards fuel-richer conditions as the CO2 dilution increases; (b) syngas flames exhibit flame-pocket structures with chemical reactions taking place in isolated pockets surrounded by non-reacting fuel/air mixture; (c) the inner recirculation zone tends to move closer to the burner axis at high CO2 dilution, and (d) the NOx emission becomes significantly lower with increasing CO2 dilution while the CO emission exhibits the opposite trend. The flame-pocket structure is more significant with increased CO2 dilution level. The low NOx emissions and high CO emissions are the results of the flame-pocket structures. (Less)
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- 2023-09-01
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- Combustion and Flame
- publisher
- Elsevier
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- scopus:85163852805
- ISSN
- 0010-2180
- DOI
- 10.1016/j.combustflame.2023.112912
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- English
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@article{c2125169-a8b7-4f04-9a6c-15bb85b88ed3,
abstract = {{The impact of CO dilution on combustion of syngas (a mixture of H<sub>2</sub>, CO, and CH<sub>4</sub>) was investigated in a lab-scale gas turbine model combustor at atmospheric pressure conditions. Two mild dilution levels of CO<sub>2</sub>, corresponding to 15% and 34% of CO<sub>2 </sub>mole fraction in the syngas/CO<sub>2 </sub>mixtures, were experimentally investigated to evaluate the effects of CO<sub>2 </sub>dilution on the flame structures and the emissions of CO and NOx. All experiments were performed at a constant Reynolds number (Re = 10000). High-speed flame luminescence, simultaneous planar laser-induced fluorescence (PLIF) measurements of the OH radicals and particle image velocimetry (PIV) were employed for qualitative and quantitative assessment of the resulting flame and flow structures. The main findings are: (a) the operability range of the syngas flames is significantly affected by the CO<sub>2 </sub>dilution, with both the lean blowoff (LBO) limit and the flashback limit shifting towards fuel-richer conditions as the CO<sub>2 </sub>dilution increases; (b) syngas flames exhibit flame-pocket structures with chemical reactions taking place in isolated pockets surrounded by non-reacting fuel/air mixture; (c) the inner recirculation zone tends to move closer to the burner axis at high CO<sub>2 </sub>dilution, and (d) the NOx emission becomes significantly lower with increasing CO<sub>2 </sub>dilution while the CO emission exhibits the opposite trend. The flame-pocket structure is more significant with increased CO<sub>2 </sub>dilution level. The low NOx emissions and high CO emissions are the results of the flame-pocket structures.}},
author = {{Pignatelli, Francesco and Derafshzan, Saeed and Sanned, David and Papafilippou, Nikolaos and Szász, Robert-Zoltán and Aqib Chishty, Muhammad and Petersson, P. and Bai, Xue-Song and Gebart, Rikard and Ehn, Andreas and Richter, Mattias and Lörstad, Daniel and Subash, Arman Ahamed}},
issn = {{0010-2180}},
language = {{eng}},
month = {{09}},
publisher = {{Elsevier}},
series = {{Combustion and Flame}},
title = {{Effect of CO<sub>2</sub> dilution on structures of premixed syngas/air flames in a gas turbine model combustor}},
url = {{http://dx.doi.org/10.1016/j.combustflame.2023.112912}},
doi = {{10.1016/j.combustflame.2023.112912}},
year = {{2023}},
}