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Large eddy simulation of coal-ammonia flames with varied ammonia injection locations using a flamelet-based approach

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  • Yadav, Sujeet
  • Yu, Panlong
  • Tanno, Kenji
  • Watanabe, Hiroaki

Abstract

The co-combustion characteristics of ammonia with pulverized coal have been investigated by applying a three-mixture fraction flamelet/progress variable (3Z-FPV) approach to a highly resolved large eddy simulation. In this 3Z-FPV model, fuel streams from the ammonia, coal volatiles, and char-off gases are represented by their respective mixture fractions. Two different cases of co-combustion of pulverized coal and ammonia have been investigated in which ammonia has been injected into burner (case 1) and side measurement port located at 1.0 m downstream from the burner (case 2). Comparison of numerical results to experimental data showed reasonable agreement for temperature, oxygen mole fraction, and NO emissions. 3Z-FPV-LES approach has successfully described the flow field and combustion characteristics of the coal-NH3 flame in both cases. In case 1, ammonia injected through the burner penetrates internal recirculation zone, causing flame front to shift slightly downstream than case 2. During the experiment, peak NO was 60% higher and closer to the burner for 1.0 m downstream ammonia injection case than the burner ammonia injection case. This trend was also observed in the FPV-LES model, which predicted a 45% higher peak NO concentration for case 2 than for case 1.

Suggested Citation

  • Yadav, Sujeet & Yu, Panlong & Tanno, Kenji & Watanabe, Hiroaki, 2023. "Large eddy simulation of coal-ammonia flames with varied ammonia injection locations using a flamelet-based approach," Energy, Elsevier, vol. 276(C).
    • Handle: RePEc:eee:energy:v:276:y:2023:i:c:s0360544223009404
    DOI: 10.1016/j.energy.2023.127546
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    References listed on IDEAS

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    1. Ahn, Seongyool & Tainaka, Kazuki & Watanabe, Hiroaki & Kitagawa, Toshiaki, 2019. "Experimental and numerical analysis of turbulent pulverized coal flame in a coaxial burner," Energy, Elsevier, vol. 179(C), pages 727-735.
    2. Tamura, Masato & Gotou, Takahiro & Ishii, Hiroki & Riechelmann, Dirk, 2020. "Experimental investigation of ammonia combustion in a bench scale 1.2 MW-thermal pulverised coal firing furnace," Applied Energy, Elsevier, vol. 277(C).
    3. Hashimoto, Nozomu & Watanabe, Hiroaki & Kurose, Ryoichi & Shirai, Hiromi, 2017. "Effect of different fuel NO models on the prediction of NO formation/reduction characteristics in a pulverized coal combustion field," Energy, Elsevier, vol. 118(C), pages 47-59.
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    1. Yadav, Sujeet & Yu, Panlong & Tanno, Kenji & Watanabe, Hiroaki, 2024. "Evaluation of coal ammonia flames using a non-adiabatic three mixture fraction flamelet progress variable approach," Energy, Elsevier, vol. 288(C).
    2. Żaklin Grądz & Waldemar Wójcik & Konrad Gromaszek & Andrzej Kotyra & Saule Smailova & Aigul Iskakova & Bakhyt Yeraliyeva & Saule Kumargazhanova & Baglan Imanbek, 2023. "Application of Fuzzy Neural Networks in Combustion Process Diagnostics," Energies, MDPI, vol. 17(1), pages 1-19, December.

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