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Effects of pressure on structure and extinction limits of counterflow nonpremixed water-laden methane/air flames

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  • Lee, Seungro
  • Ha, Heonrok
  • Dunn-Rankin, Derek
  • Kwon, Oh Chae

Abstract

Structure and extinction limits of counterflow nonpremixed water (H2O)-laden methane (CH4)/air flames at various pressures are computationally investigated to better understand combustion processes of fuel having naturally high H2O (vapor) content under elevated pressures. Using a detailed kinetic mechanism and a statistical narrow-band radiation model, the flame structure and extinction limits are predicted for elevated pressures and a wide range of flame strain rates and compared with those at atmospheric pressure. Results show that with increasing pressure the maximum flame temperature increases and the extinction limits are generally extended due to the reduced amount of dissociation and the enhanced radiation reabsorption of H2O, indicating that flames can sustain more H2O vapor at elevated pressure. The concentration of active radicals and the flame thickness decrease with increasing pressure. The observed flammable range of the H2O to CH4 molar ratio at elevated pressures is comparable to that found in self-sustained combustion of CH4 hydrates at atmospheric pressure, and the chemical effects of H2O addition on flame structure are insignificant. Elevated pressure enhances the formation of soot precursors such as acetylene (C2H2), implying an opposite tendency from the water addition effects.

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  • Lee, Seungro & Ha, Heonrok & Dunn-Rankin, Derek & Kwon, Oh Chae, 2017. "Effects of pressure on structure and extinction limits of counterflow nonpremixed water-laden methane/air flames," Energy, Elsevier, vol. 134(C), pages 545-553.
  • Handle: RePEc:eee:energy:v:134:y:2017:i:c:p:545-553
    DOI: 10.1016/j.energy.2017.06.051
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    1. Lee, Seungro & Padilla, Rosa & Dunn-Rankin, Derek & Pham, Trinh & Kwon, Oh Chae, 2015. "Extinction limits and structure of counterflow nonpremixed H2O-laden CH4/air flames," Energy, Elsevier, vol. 93(P1), pages 442-450.
    2. Maruyama, Shigenao & Deguchi, Koji & Chisaki, Masazumi & Okajima, Junnosuke & Komiya, Atsuki & Shirakashi, Ryo, 2012. "Proposal for a low CO2 emission power generation system utilizing oceanic methane hydrate," Energy, Elsevier, vol. 47(1), pages 340-347.
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    Cited by:

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