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An Experimental and Numerical Study on Supported Ultra-Lean Methane Combustion

Author

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  • Ho-Chuan Lin

    (Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan)

  • Guan-Bang Chen

    (Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan)

  • Fang-Hsien Wu

    (Research Center for Energy Technology and Strategy, National Cheng Kung University, Tainan 701, Taiwan)

  • Hong-Yeng Li

    (Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan)

  • Yei-Chin Chao

    (Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan 701, Taiwan)

Abstract

With a much larger global warming potential (GWP) and much shorter lifespan, the reduction of methane emissions offers an additional opportunity and a relatively quick way of mitigating climate change in the near future. However, the emissions from coal mining in the form of ventilation air methane (VAM), usually in ultra-lean concentration, pose the most significant technical challenge to the mitigation of methane emission. Therefore, a better understanding of ultra-lean methane combustion is essential. With three 5 mm × 50 mm rectangle cross-section slot jets, a novel sandwich-type triple-jet burner is proposed to provide stable combustion of an ultra-lean methane–air mixture with equivalence ratios from 0.3 to 0.88, and 0.22 in extreme conditions. The ultra-lean methane flame in the center of the triple-jet burner is supported by the two lean outer flames at an equivalence ratio φ = 0.88. The flow field and combustion chemical reactions are predicted by detailed numerical simulation with GRI-Mech 3.0 reaction mechanisms. Two-dimensional numerical results are validated with those obtained by experimental particle image velocimetry (PIV), as well as visual flame height and temperature measurements. An ultra-lean methane–air mixture has to burn with external support. In addition, the ultra-lean flame is non-propagating with a relatively low temperature. The ultra-lean center flame is seen to start from the outer flame and incline perfectly to the post-flame temperature and OH concentration profiles of the outer lean flame. The adjacent stronger flame provides heat and active radicals, such as OH and HO 2 , from the post-flame region and in the wall proximity of the gap between the adjacent flame and the central ultra-lean jet to initiate and maintain the combustion of the central ultra-lean flame. The outstanding wall-proximity radical of HO 2 is found to be the main contributor to the initiation and stabilization of the central ultra-lean flame by providing a low-temperature oxidation of fuel through the following reaction: HO 2 + CH 3 ⇔ OH + CH 3 O. The major chemical reaction paths contributing to fuel decomposition and oxidation of the supported ultra-lean center flame are also identified and delineated.

Suggested Citation

  • Ho-Chuan Lin & Guan-Bang Chen & Fang-Hsien Wu & Hong-Yeng Li & Yei-Chin Chao, 2019. "An Experimental and Numerical Study on Supported Ultra-Lean Methane Combustion," Energies, MDPI, vol. 12(11), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:11:p:2168-:d:237680
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    References listed on IDEAS

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