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- Title
Analysis of methane, propane, and syngas oxy‐flames in a fuel‐flex gas turbine combustor for carbon capture.
- Authors
Haque, MD Azazul; Nemitallah, Medhat A.; Abdelhafez, Ahmed; Mokheimer, Esmail M. A.; Habib, Mohamed A.
- Abstract
Summary: Premixed oxy‐combustion flames of methane, syngas (CH4:CO:H2 with the molar ratio of 2:1:1), and propane in CO2‐diluted environment (for carbon capture) are examined in a swirl‐stabilized combustor using large eddy simulations (LES) in three‐dimensional (3‐D) domain. The flame and emission characteristics are examined for the different fuels over a range of equivalence ratios (Φ: 0.34, 0.39, and 0.42), at 60% oxygen fraction (OF), and 2.5 m/s bulk inlet velocity under atmospheric conditions. The results indicate increments in several characteristic parameters that are of special importance for gas turbine combustion applications, including adiabatic flame temperature (Tad), laminar flame speed (LFS), power density (PD), product formation rate (PFR), Damköhler number (Da), and CO emission, with the increase of Φ whatever the type of fuel. Alternatively, flame thickness (δ) decreases with the increase in Φ for the three fuels. Characteristic "V" shape with almost identical outer recirculation zone (ORZ) is also observed for the three fuels. Among the studied fuels, oxy‐methane flames demonstrate highest flame thicknesses, least uniform temperature distribution (highest pattern factor) at combustor outlet, and lowest CO emission level. Oxy‐syngas flames show more uniform temperature distribution (lowest pattern factor) at combustor outlet and highest CO emission as compared with the oxy‐methane and oxy‐propane flames. The oxy‐propane flames have higher values of Tad, LFS, PD, PFR, Da, and thermal power (TP) along with lowest flame thickness compared with methane and syngas counterparts. Highlights: Increasing equivalence ratio improves the flame characteristics but increases CO emission.Fuel type has insignificant effects on shape/size of the outer recirculation zone (ORZ).Oxy‐methane flames showed highest flame thicknesses and pattern factor and lowest CO.Oxy‐syngas flames demonstrate highest CO emission and lowest pattern factor.Oxy‐propane flames demonstrate higher values of temperature (Tad), laminar flame speed (LFS), power density (PD), product formation rate (PFR), Damköhler number (Da), and thermal power (TP).
- Subjects
FLAME; METHANE flames; GAS turbine combustion; GAS turbines; SWIRLING flow; ADIABATIC temperature; LARGE eddy simulation models
- Publication
International Journal of Energy Research, 2022, Vol 46, Issue 7, p8657
- ISSN
0363-907X
- Publication type
Article
- DOI
10.1002/er.7745