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Ammonia/methane dual-fuel injection and Co-firing strategy in a swirl flame combustor for pollutant emissions control

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  • Wang, Siqi
  • Chong, Cheng Tung
  • Xie, Tian
  • Józsa, Viktor
  • Ng, Jo-Han

Abstract

The co-firing of ammonia with hydrocarbon fuel is a promising way to reduce the emissions of carbon dioxides. However, conventional way of co-firing under premixed lean swirl flame results in high NOx pollutant emissions, thus requiring an innovative mitigation strategy to solve the CO2-NOx conundrum. In the present study, the combustion characteristics and emissions performance of a partially-mix ammonia-methane dual flames are examined and compared with fully premixed swirl flame. Flame imaging shows a distinctive luminous central jet flame surrounded by compact swirl flame for the dual flame, as opposed to the lean bluish single-stage premixed flame. The flow field of the dual flames shows the absence of the typical recirculation flow of premixed flame, yet stabilisation of the flame is barely affected. The dual-flame shows reduced NO and CO emissions by at least a factor of 2 compared with the fully premixed flame. Low emissions of NO and CO can be attained for NH3–CH4 dual-fuel flames at φ ∼0.65. The reduced NO emission via the dual-fuel injection technique can lead to improved economics for the subsequent flue gas treatment to meet the emission regulation targets.

Suggested Citation

  • Wang, Siqi & Chong, Cheng Tung & Xie, Tian & Józsa, Viktor & Ng, Jo-Han, 2023. "Ammonia/methane dual-fuel injection and Co-firing strategy in a swirl flame combustor for pollutant emissions control," Energy, Elsevier, vol. 281(C).
    • Handle: RePEc:eee:energy:v:281:y:2023:i:c:s0360544223016158
    DOI: 10.1016/j.energy.2023.128221
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    References listed on IDEAS

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    1. Chai, Wai Siong & Bao, Yulei & Jin, Pengfei & Tang, Guang & Zhou, Lei, 2021. "A review on ammonia, ammonia-hydrogen and ammonia-methane fuels," Renewable and Sustainable Energy Reviews, Elsevier, vol. 147(C).
    2. Chong, Cheng Tung & Hochgreb, Simone, 2017. "Flame structure, spectroscopy and emissions quantification of rapeseed biodiesel under model gas turbine conditions," Applied Energy, Elsevier, vol. 185(P2), pages 1383-1392.
    3. Xiao, Hua & Valera-Medina, Agustin & Bowen, Philip J, 2017. "Study on premixed combustion characteristics of co-firing ammonia/methane fuels," Energy, Elsevier, vol. 140(P1), pages 125-135.
    4. Ku, J.W. & Ahn, Y.J. & Kim, H.K. & Kim, Y.H. & Kwon, O.C., 2020. "Propagation and emissions of premixed methane-ammonia/air flames," Energy, Elsevier, vol. 201(C).
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