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Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure

Author

Listed:
  • Mao Li

    (Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden)

  • Yiheng Tong

    (Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden)

  • Marcus Thern

    (Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden)

  • Jens Klingmann

    (Department of Energy Sciences, Lund University, Ole Römers väg 1, SE-22100 Lund, Sweden)

Abstract

Steam-diluted combustion in gas turbine systems is an effective approach to control pollutant emissions and improve the gas turbine efficiency. The primary purpose of the present research is to analyze the influence of steam dilution on the combustion stability, flame structures, and CO emissions of a swirl-stabilized gas turbine model combustor under atmospheric pressure conditions. The premixed methane/air/steam flame was investigated with three preheating temperatures (384 K/434 K/484 K) and the equivalence ratio was varied from stoichiometric conditions to the flammability limits where the flame was physically blown out from the combustor. In order to represent the steam dilution intensity, the steam fraction Ω defined as the steam to air mass flow rate ratio was used in this work. Exhaust gases were sampled with a water-cooled emission probe which was mounted at the combustor exit. A 120 mm length quartz liner was used which enabled the flame visualization and optical measurement. Time-averaged CH chemiluminescence imaging was conducted to characterize the flame location and it was further analyzed with the inverse Abel transform method. Chemical kinetics calculation was conducted to support and analyze the experimental results. It was found that the LBO (lean blowout) limits were increased with steam fraction. CH chemiluminescence imaging showed that with a high steam fraction, the flame length was elongated, but the flame structure was not altered. CO emissions were mapped as a function of the steam fraction, inlet air temperature, and equivalence ratios. Stable combustion with low CO emission can be achieved with an appropriate steam fraction operation range.

Suggested Citation

  • Mao Li & Yiheng Tong & Marcus Thern & Jens Klingmann, 2017. "Influence of the Steam Addition on Premixed Methane Air Combustion at Atmospheric Pressure," Energies, MDPI, vol. 10(7), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:1070-:d:105630
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    References listed on IDEAS

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    1. Jonsson, Maria & Yan, Jinyue, 2005. "Humidified gas turbines—a review of proposed and implemented cycles," Energy, Elsevier, vol. 30(7), pages 1013-1078.
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    Cited by:

    1. Abdulrahman Abdullah Bahashwan & Rosdiazli Bin Ibrahim & Madiah Binti Omar & Mochammad Faqih, 2022. "The Lean Blowout Prediction Techniques in Lean Premixed Gas Turbine: An Overview," Energies, MDPI, vol. 15(22), pages 1-21, November.
    2. Mao Li & Yiheng Tong & Jens Klingmann & Marcus Thern, 2017. "Impact of Vitiation on a Swirl-Stabilized and Premixed Methane Flame," Energies, MDPI, vol. 10(10), pages 1-16, October.
    3. Pappa, Alessio & Cordier, Marie & Bénard, Pierre & Bricteux, Laurent & De Paepe, Ward, 2022. "How do water and CO2 impact the stability and emissions of the combustion in a micro gas turbine? — A Large Eddy Simulations comparison," Energy, Elsevier, vol. 248(C).

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