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A novel air injection scheme to achieve MILD combustion in a can-type gas turbine combustor

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  • Sharma, Saurabh
  • Chowdhury, Arindrajit
  • Kumar, Sudarshan

Abstract

This article presents the design and development of a can-type gas turbine combustor operating in flameless combustion mode with liquid fuels. The combustor operates with kerosene and thermal intensities varying from 5.1 to 7.5 MW/m3. A novel air-injection scheme is proposed, in which air is supplied from different injection holes namely, swirl air near fuel injection, primary, secondary and dilution air in the downstream. These air injection holes are arranged in a way to help create strong recirculation of hot combustion products leading to increased mixing and dilution of incoming fresh reactants. Direction, orientation and mass fraction of swirl, primary, secondary and dilution air are optimized through a series of reacting flow simulations aimed at maximizing the reactant dilution ratio, a key parameter to achieve flameless combustion. It is observed that if the momentum of the air is increased beyond a critical value, the combustor switches its operation into flameless mode due to increased mixing and dilution of fresh reactants with hot combustion products. Combustion occurs in a well-distributed reaction regime within the combustor volume. Measured NOx emissions are less than 5 ppm and acoustic emissions are significantly reduced during the combustor operation in flameless combustion mode.

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  • Sharma, Saurabh & Chowdhury, Arindrajit & Kumar, Sudarshan, 2020. "A novel air injection scheme to achieve MILD combustion in a can-type gas turbine combustor," Energy, Elsevier, vol. 194(C).
    • Handle: RePEc:eee:energy:v:194:y:2020:i:c:s0360544219325149
    DOI: 10.1016/j.energy.2019.116819
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    References listed on IDEAS

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    6. He, Yizhuo & Zou, Chun & Song, Yu & Liu, Yang & Zheng, Chuguang, 2016. "Numerical study of characteristics on NO formation in methane MILD combustion with simultaneously hot and diluted oxidant and fuel (HDO/HDF)," Energy, Elsevier, vol. 112(C), pages 1024-1035.
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    Cited by:

    1. Cheong, Kin-Pang & Wang, Guochang & Si, Jicang & Mi, Jianchun, 2021. "Nonpremixed MILD combustion in a laboratory-scale cylindrical furnace: Occurrence and identification," Energy, Elsevier, vol. 216(C).
    2. Zhao, Qiaonan & Liu, Feng & Jiao, Anyao & Yang, Qiguo & Xu, Hongtao & Liao, Xiaowei, 2023. "Prediction model of NOx emissions in the heavy-duty gas turbine combustor based on MILD combustion," Energy, Elsevier, vol. 282(C).
    3. Pramanik, Santanu & Ravikrishna, R.V., 2022. "Non premixed operation strategies for a low emission syngas fuelled reverse flow combustor," Energy, Elsevier, vol. 254(PB).
    4. Józsa, Viktor & Malý, Milan & Füzesi, Dániel & Rácz, Erika & Kardos, Réka Anna & Jedelský, Jan, 2023. "Schlieren analysis of non-MILD distributed combustion in a mixture temperature-controlled burner," Energy, Elsevier, vol. 273(C).
    5. Sharma, Saurabh & Singh, Paramvir & Gupta, Ashish & Chowdhury, Arindrajit & Khandelwal, Bhupendra & Kumar, Sudarshan, 2020. "Distributed combustion mode in a can-type gas turbine combustor – A numerical and experimental study," Applied Energy, Elsevier, vol. 277(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).

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