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Comparative analysis of the stability and structure of premixed C3H8/O2/CO2 and C3H8/O2/N2 flames for clean flexible energy production

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  • Ali, Asif
  • Nemitallah, Medhat A.
  • Abdelhafez, Ahmed
  • Hussain, Muzafar
  • Kamal, M. Mustafa
  • Habib, Mohamed A.

Abstract

The study compares the macrostructure and stabilization parameters of premixed oxy-propane (C3H8/O2/CO2) and oxygen-enriched air-propane (C3H8/O2/N2) flames at fixed inlet velocity of 5.2 m/s and under similar conditions of oxygen fraction (OF= 21%–70%) and equivalence ratio (ϕ=0.1−1.0) in a model dry-low-emissions (DLE) gas turbine combustor. The combustor stability maps were plotted within the ϕ-OF domain against background contours of constant adiabatic flame temperature (AFT), to quantify the blowout and flashback limits. It was found for both CO2- and N2-diluted flames that the blowout and flashback limits followed constant AFT contours on the stability maps. The blowout limit of both types of flames roughly followed the same AFT contour of about ∼1580 K, while the flashback limits followed the constant AFT contour of 2350 K. This implies that C3H8/O2/N2 flames blow out at leaner conditions compared to C3H8/O2/CO2 flames. The effect of diluent type on blowout limit diminishes at higher OF; above 55% both flames blow out at ϕ∼0.2. All flames of the same AFT exhibited considerably identical shapes despite having different OF and ϕ. Based on that, the design and operation of future oxy-fuel turbines is recommended to be AFT-based rather than OF or ϕ.

Suggested Citation

  • Ali, Asif & Nemitallah, Medhat A. & Abdelhafez, Ahmed & Hussain, Muzafar & Kamal, M. Mustafa & Habib, Mohamed A., 2021. "Comparative analysis of the stability and structure of premixed C3H8/O2/CO2 and C3H8/O2/N2 flames for clean flexible energy production," Energy, Elsevier, vol. 214(C).
    • Handle: RePEc:eee:energy:v:214:y:2021:i:c:s0360544220319940
    DOI: 10.1016/j.energy.2020.118887
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    References listed on IDEAS

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    1. Abubakar, Zubairu & Shakeel, Mohammad Raghib & Mokheimer, Esmail M.A., 2018. "Experimental and numerical analysis of non-premixed oxy-combustion of hydrogen-enriched propane in a swirl stabilized combustor," Energy, Elsevier, vol. 165(PB), pages 1401-1414.
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    3. Abdelhafez, Ahmed & Rashwan, Sherif S. & Nemitallah, Medhat A. & Habib, Mohamed A., 2018. "Stability map and shape of premixed CH4/O2/CO2 flames in a model gas-turbine combustor," Applied Energy, Elsevier, vol. 215(C), pages 63-74.
    4. Grönkvist, S. & Bryngelsson, M. & Westermark, M., 2006. "Oxygen efficiency with regard to carbon capture," Energy, Elsevier, vol. 31(15), pages 3220-3226.
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    1. Abdelhafez, Ahmed & Hussain, Muzafar & Nemitallah, Medhat A. & Habib, Mohamed A. & Ali, Asif, 2021. "Effects of jet diameter and spacing in a micromixer-like burner for clean oxy-fuel combustion in gas turbines," Energy, Elsevier, vol. 228(C).
    2. Baraiya, Nikhil A. & Ramanan, Vikram & Nagarajan, Baladandayuthapani & Vegad, Chetankumar S. & Chakravarthy, S.R., 2023. "Dynamic mode decomposition of syngas (H2/CO) flame during transition to high-frequency instability in turbulent combustor," Energy, Elsevier, vol. 263(PD).

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