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An experimental study on premixed laminar and turbulent combustion of synthesized coalbed methane

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  • Zheng, Shizhuo
  • Zhang, Xin
  • Wang, Tao
  • Liu, Jie

Abstract

Coalbed methane is an economic and sustainable alternative fuel for spark ignition engines. In a constant volume combustion bomb, an experimental study was conducted about laminar and turbulent burning characteristics of the premixed coalbed methane/air flames. The turbulent burning velocities of coalbed methane-air mixtures were obtained as well as unstretched laminar burning velocities and Markstein lengths of coalbed methane at different rms (root-mean-square) turbulent velocities of 0.03, 0.05, 0.1 m/s, equivalence ratios of 0.8–1.2, and pressures of 0.1, 0.3 MPa. The results reveal that the unstretched laminar burning velocities of the premixed coalbed methane/air mixtures decrease with the increase of N2 volumetric fractions and the initial pressures. The Markstein lengths increase with the rise of the N2 volumetric fractions and the equivalence ratios, but decrease with the increase of initial pressures. With the increase of rms turbulent velocity, the turbulent burning velocities of coalbed methane/air mixtures are promoted at the equivalence ratios ranging from 0.8 to 1.2. The ratio of turbulent burning velocity to laminar burning velocity decreases with the increase of the equivalence ratios, while it increases with the increase of N2 volumetric fractions in coalbed methane.

Suggested Citation

  • Zheng, Shizhuo & Zhang, Xin & Wang, Tao & Liu, Jie, 2015. "An experimental study on premixed laminar and turbulent combustion of synthesized coalbed methane," Energy, Elsevier, vol. 92(P3), pages 355-364.
    • Handle: RePEc:eee:energy:v:92:y:2015:i:p3:p:355-364
    DOI: 10.1016/j.energy.2015.04.007
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    References listed on IDEAS

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    1. Zuo, Chengji & Qian, Yejian & Tan, Jian & Xu, Hongming, 2008. "An experimental study of combustion and emissions in a spark-ignition engine fueled with coal-bed gas," Energy, Elsevier, vol. 33(3), pages 455-461.
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    3. Luo, D.K. & Dai, Y.J. & Xia, L.Y., 2011. "Economic evaluation based policy analysis for coalbed methane industry in China," Energy, Elsevier, vol. 36(1), pages 360-368.
    4. Su, Shi & Yu, Xinxiang, 2015. "A 25 kWe low concentration methane catalytic combustion gas turbine prototype unit," Energy, Elsevier, vol. 79(C), pages 428-438.
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    1. Markovska, Natasa & Duić, Neven & Mathiesen, Brian Vad & Guzović, Zvonimir & Piacentino, Antonio & Schlör, Holger & Lund, Henrik, 2016. "Addressing the main challenges of energy security in the twenty-first century – Contributions of the conferences on Sustainable Development of Energy, Water and Environment Systems," Energy, Elsevier, vol. 115(P3), pages 1504-1512.

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