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Lean flammability limits for stable performance with a porous burner

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  • Akbari, M.H.
  • Riahi, P.
  • Roohi, R.

Abstract

Applications of porous burners are of high interest due to many advantages such as extended lean flammability limit in comparison with free flame structures. In this work, laminar premixed flame propagation of methane/air mixture in a porous medium is numerically investigated. An unsteady one-dimensional physical model of a porous burner is considered, in which the flame location is not predetermined. The computational domain is extended beyond either side of the porous medium to accurately model reactions close to the edges of the solid matrix. After validation of the model and performing a baseline simulation, a parametric study is carried out to investigate the lean flammability limits of the burner and the unstable flash-back/blow-out phenomena. Stable performance diagrams are given for two controlling parameters of turn-down ratio and porous medium porosity. The simulation results indicate that the stable performance range of the burner is extended when the equivalence ratio increases; however, the blow-out region expands with an increase in the firing rate. For constant values of porosity and firing rate, increasing the equivalence ratio can change the operating regime of the burner from blow-out to a stable condition. It is observed that by the variation of porosity in the range of 0.6-0.9, and for the equivalence ratios of more than 0.6, the flame flash-back cannot occur. An equivalence ratio of 0.43 is found to be the lower limit at which the flame stabilizes in the matrix.

Suggested Citation

  • Akbari, M.H. & Riahi, P. & Roohi, R., 2009. "Lean flammability limits for stable performance with a porous burner," Applied Energy, Elsevier, vol. 86(12), pages 2635-2643, December.
  • Handle: RePEc:eee:appene:v:86:y:2009:i:12:p:2635-2643
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    References listed on IDEAS

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    1. Qiu, K. & Hayden, A.C.S., 2009. "Increasing the efficiency of radiant burners by using polymer membranes," Applied Energy, Elsevier, vol. 86(3), pages 349-354, March.
    2. Mujeebu, M. Abdul & Abdullah, M.Z. & Bakar, M.Z. Abu & Mohamad, A.A. & Abdullah, M.K., 2009. "Applications of porous media combustion technology - A review," Applied Energy, Elsevier, vol. 86(9), pages 1365-1375, September.
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    Cited by:

    1. Billerot, Pierre-Lou & Dufresne, Louis & Lemaire, Romain & Seers, Patrice, 2020. "3D CFD analysis of a diamond lattice-based porous burner," Energy, Elsevier, vol. 207(C).
    2. Zangeneh, Vahid & Alipoor, Alireza, 2021. "Stability study of hydrogen-air flame in a conical porous burner," Energy, Elsevier, vol. 215(PB).
    3. Zhang, Xiaolei & Hu, Longhua & Delichatsios, Michael A. & Zhang, Jianping, 2019. "Experimental study on flame morphologic characteristics of wall attached non-premixed buoyancy driven turbulent flames," Applied Energy, Elsevier, vol. 254(C).
    4. Akbari, M.H. & Riahi, P., 2010. "Investigation of the structural and reactants properties on the thermal characteristics of a premixed porous burner," Applied Energy, Elsevier, vol. 87(4), pages 1433-1440, April.
    5. Shang, Fengju & Hu, Longhua & Sun, Xiepeng & Wang, Qiang & Palacios, Adriana, 2017. "Flame downwash length evolution of non-premixed gaseous fuel jets in cross-flow: Experiments and a new correlation," Applied Energy, Elsevier, vol. 198(C), pages 99-107.
    6. Yu, Zhi-Qiang & Feng, Yong-Liang & Zhou, Wen-Jing & Jin, Yu & Li, Ming-Jie & Li, Zeng-Yao & Tao, Wen-Quan, 2013. "Study on flow and heat transfer characteristics of composite porous material and its performance analysis by FSP and EDEP," Applied Energy, Elsevier, vol. 112(C), pages 1367-1375.
    7. Gao, Huai-Bin & Qu, Zhi-Guo & He, Ya-ling & Tao, Wen-Quan, 2012. "Experimental study of combustion in a double-layer burner packed with alumina pellets of different diameters," Applied Energy, Elsevier, vol. 100(C), pages 295-302.
    8. Wang, Hongmin & Wei, Chunzhi & Zhao, Pinghui & Ye, Taohong, 2014. "Experimental study on temperature variation in a porous inert media burner for premixed methane air combustion," Energy, Elsevier, vol. 72(C), pages 195-200.
    9. Zhang, Hao & Hong, Hui & Jiang, Qiongqiong & Deng, Ya'nan & Jin, Hongguang & Kang, Qilan, 2018. "Development of a chemical-looping combustion reactor having porous honeycomb chamber and experimental validation by using NiO/NiAl2O4," Applied Energy, Elsevier, vol. 211(C), pages 259-268.

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