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Experimental evaluation of a 20kW oxygen enhanced self-regenerative burner operated in flameless combustion mode

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  • Sánchez, Mario
  • Cadavid, Francisco
  • Amell, Andrés

Abstract

Results are presented on the effects of oxygen enrichment on the performance of a flameless combustion furnace equipped with a regenerative burner. Natural gas was used as fuel (∼97% CH4) and the oxygen concentration in the combustion air was varied from 21% to 35% (volumetric percent). The influence of oxygen enrichment on temperature and species profiles, pollutant emissions, thermal efficiency and regenerators effectiveness was quantified; measures were registered under steady state conditions for average wall temperatures of 880°C. The results showed that for all oxygen enrichment rates it was possible to obtain the flameless combustion phenomena with its typical features, like no luminous effect, wide reaction zone and uniform temperature profile. A temperature peak of 1034°C was measured for the operation with oxygen enriched air (35% O2) compared to 975°C when normal air (21% O2) was used. NOx emissions were below 5ppm and the global efficiency increased almost 5% for an oxygen enriched level of 30%. Some comparisons to the burner operating without oxygen enrichment in conventional and flameless mode are presented to highlight the advantages of oxygen enhanced flameless combustion (OEFC) using self-regenerative burners.

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  • Sánchez, Mario & Cadavid, Francisco & Amell, Andrés, 2013. "Experimental evaluation of a 20kW oxygen enhanced self-regenerative burner operated in flameless combustion mode," Applied Energy, Elsevier, vol. 111(C), pages 240-246.
    • Handle: RePEc:eee:appene:v:111:y:2013:i:c:p:240-246
    DOI: 10.1016/j.apenergy.2013.05.009
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    References listed on IDEAS

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    1. Bělohradský, Petr & Skryja, Pavel & Hudák, Igor, 2014. "Experimental study on the influence of oxygen content in the combustion air on the combustion characteristics," Energy, Elsevier, vol. 75(C), pages 116-126.
    2. Li, Jun & Huang, Hongyu & Kobayashi, Noriyuki & He, Zhaohong & Osaka, Yugo & Zeng, Tao, 2015. "Numerical study on effect of oxygen content in combustion air on ammonia combustion," Energy, Elsevier, vol. 93(P2), pages 2053-2068.
    3. Ye, Jingjing & Medwell, Paul R. & Varea, Emilien & Kruse, Stephan & Dally, Bassam B. & Pitsch, Heinz G., 2015. "An experimental study on MILD combustion of prevaporised liquid fuels," Applied Energy, Elsevier, vol. 151(C), pages 93-101.
    4. Li, Zhiyi & Ferrarotti, Marco & Cuoci, Alberto & Parente, Alessandro, 2018. "Finite-rate chemistry modelling of non-conventional combustion regimes using a Partially-Stirred Reactor closure: Combustion model formulation and implementation details," Applied Energy, Elsevier, vol. 225(C), pages 637-655.
    5. Yepes, Hernando A. & Obando, Julián E. & Amell, Andrés A., 2022. "The effect of syngas addition on flameless natural gas combustion in a regenerative furnace," Energy, Elsevier, vol. 252(C).
    6. Fordoei, E. Ebrahimi & Mazaheri, Kiumars & Mohammadpour, Amirreza, 2021. "Numerical study on the heat transfer characteristics, flame structure, and pollutants emission in the MILD methane-air, oxygen-enriched and oxy-methane combustion," Energy, Elsevier, vol. 218(C).
    7. Pavel Skryja & Igor Hudak & Jiří Bojanovsky & Zdeněk Jegla & Lubomír Korček, 2022. "Effects of Oxygen-Enhanced Combustion Methods on Combustion Characteristics of Non-Premixed Swirling Flames," Energies, MDPI, vol. 15(6), pages 1-21, March.

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