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Fostering distributed combustion in a swirl burner using prevaporized liquid fuels

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  • Khalil, Ahmed E.E.
  • Gupta, Ashwani K.

Abstract

Colorless Distributed Combustion (CDC) has presented itself as an environmentally friendly combustion method with significant benefits on ultra-low emissions, uniform thermal field (pattern factor), reduced noise, mitigation of instability and enhanced flame stability. CDC requisites include controlled entrainment of hot reactive species from within the combustor and their subsequent mixing with fresh reactants to form a low-oxygen concentration high-temperature oxidizer prior to ignition. This mixture results in distributed reaction over the entire combustion volume. To date, most of the CDC research efforts have focused on gaseous fuels only. In this paper, conditions fostering distributed combustion using JP-8 and alternative ethanol fuels. Data revealed that transition to CDC can be achieved at oxygen concertation of approximately 9.5% for both the fuels. This oxygen concentration was determined based on reaction field uniformity as identified from OH∗ chemiluminescence signatures. Under distributed combustion, emissions were substantially reduced by some 95% to result in NOx emissions of less than 2 PPM with minimal impact on CO emission from both JP-8 and ethanol fuels at an equivalence ratio of 0.9, with even lower emissions at lower equivalence ratios. Combining the data obtained with liquid fuels with those from gaseous fuels revealed that, regardless of the fuel used, the oxygen concentration at which CDC prevailed can be predicted based on mixture temperature within a range of 0.75%. This knowledge enables designing a combustor to achieve CDC regardless of the fuel used. The data are useful in the design and development of fuel flexible CDC for high combustion intensity gas turbine applications.

Suggested Citation

  • Khalil, Ahmed E.E. & Gupta, Ashwani K., 2018. "Fostering distributed combustion in a swirl burner using prevaporized liquid fuels," Applied Energy, Elsevier, vol. 211(C), pages 513-522.
    • Handle: RePEc:eee:appene:v:211:y:2018:i:c:p:513-522
    DOI: 10.1016/j.apenergy.2017.11.068
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    References listed on IDEAS

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    1. Ye, Jingjing & Medwell, Paul R. & Varea, Emilien & Kruse, Stephan & Dally, Bassam B. & Pitsch, Heinz G., 2015. "An experimental study on MILD combustion of prevaporised liquid fuels," Applied Energy, Elsevier, vol. 151(C), pages 93-101.
    2. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Thermal field investigation under distributed combustion conditions," Applied Energy, Elsevier, vol. 160(C), pages 477-488.
    3. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2011. "Distributed swirl combustion for gas turbine application," Applied Energy, Elsevier, vol. 88(12), pages 4898-4907.
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    6. Xing, Fei & Kumar, Arvind & Huang, Yue & Chan, Shining & Ruan, Can & Gu, Sai & Fan, Xiaolei, 2017. "Flameless combustion with liquid fuel: A review focusing on fundamentals and gas turbine application," Applied Energy, Elsevier, vol. 193(C), pages 28-51.
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    9. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Internal entrainment effects on high intensity distributed combustion using non-intrusive diagnostics," Applied Energy, Elsevier, vol. 160(C), pages 467-476.
    10. Khalil, Ahmed E.E. & Gupta, Ashwani K., 2015. "Impact of internal entrainment on high intensity distributed combustion," Applied Energy, Elsevier, vol. 156(C), pages 241-250.
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    Cited by:

    1. Shen, Yazhou & Zhang, Kai & Zhang, Yan & Duwig, Christophe, 2023. "Characterisation of distributed combustion of reformed methanol blends in a model gas turbine combustor," Energy, Elsevier, vol. 272(C).
    2. Karyeyen, Serhat & Feser, Joseph S. & Jahoda, Edward & Gupta, Ashwani K., 2020. "Development of distributed combustion index from a swirl-assisted burner," Applied Energy, Elsevier, vol. 268(C).
    3. Karyeyen, Serhat & Feser, Joseph S. & Gupta, Ashwani K., 2019. "Swirl assisted distributed combustion behavior using hydrogen-rich gaseous fuels," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    4. Feser, Joseph S. & Bassioni, Ghada & Gupta, Ashwani K., 2018. "Effect of naphthalene addition to ethanol in distributed combustion," Applied Energy, Elsevier, vol. 216(C), pages 1-7.
    5. Zhang, R.C. & Bai, N.J. & Fan, W.J. & Huang, X.Y. & Fan, X.Q., 2019. "Influence of flame stabilization and fuel injection modes on the flow and combustion characteristics of gas turbine combustor with cavity," Energy, Elsevier, vol. 189(C).

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