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Starting up implication of the two-region porous inert medium (PIM) burners

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  • Bakry, Ayman I.
  • Rabea, Karim
  • El-Fakharany, Magda

Abstract

An inherent serious problem was noticed when the two-region Porous-Inert-Medium (PIM) burners were started-up at low-powers. The ignition near their downstream surface, failed to commence a correct combustion process. Depending on a limiting excess-air-ratio (λ), two distinct combustion patterns were detected. A noisy-explosive flame-plume was remarked for values below this limit, while a suspended free-flame on the downstream surface was observed for values above this limit. The combustion process was self-extinguished in both patterns. A systematic study was performed to explore this phenomenon. The real-time temperature variation was measured along a two-region PIM burner of wire-mesh and SiC-foam materials of different configurations as supercritical regions. It was fueled with Liquefied-Petroleum-Gas (LPG) and examined at several elevated low-powers between 0.576 and 2.535 kW. All the applied powers were checked at the same λ values between 0.73 and 1.58. An essential limiting power, associated with every PIM configuration, or higher at λ below the limiting value should be applied for an adequate and immediate startup. The limiting λ was found to depend only on the PIM material. Therefore, researchers and designers of PIM burners should identify these limiting power and λ values for their own PIM configurations before devoting them in real-appliances.

Suggested Citation

  • Bakry, Ayman I. & Rabea, Karim & El-Fakharany, Magda, 2020. "Starting up implication of the two-region porous inert medium (PIM) burners," Energy, Elsevier, vol. 201(C).
    • Handle: RePEc:eee:energy:v:201:y:2020:i:c:s036054422030709x
    DOI: 10.1016/j.energy.2020.117602
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    References listed on IDEAS

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    1. Janvekar, Ayub Ahmed & Miskam, M.A. & Abas, Aizat & Ahmad, Zainal Arifin & Juntakan, T. & Abdullah, M.Z., 2017. "Effects of the preheat layer thickness on surface/submerged flame during porous media combustion of micro burner," Energy, Elsevier, vol. 122(C), pages 103-110.
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