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    Stability limits and NO emissions of technically-premixed ammonia-hydrogen-nitrogen-air swirl flames

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    Revised Manuscript_Clean_IJHE_NH3-H2_Stability_NO_Final (1).pdf
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    944.5Kb
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    Description:
    Accepted Manuscript
    Embargo End Date:
    2022-08-06
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    Type
    Article
    Authors
    Khateeb, Abdulrahman A. cc
    Guiberti, Thibault
    Zhu, Xuren cc
    Younes, Mourad
    Jamal, Aqil
    Roberts, William L. cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2020-07-07
    Online Publication Date
    2020-07-07
    Print Publication Date
    2020-08
    Embargo End Date
    2022-08-06
    Submitted Date
    2020-03-03
    Permanent link to this record
    http://hdl.handle.net/10754/664592
    
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    Abstract
    Hydrogen is a promising carbon-free fuel for power generation in gas turbines. However, this raises some challenges associated with the storage and distribution of pure hydrogen. Storing hydrogen chemically in the form of ammonia is a safe and efficient alternative. However, ammonia as a fuel features a low chemical reactivity compared to hydrogen and natural gas and, as a consequence, stabilizing turbulent ammonia-air flames is challenging. Offsetting this low reactivity by enriching ammonia with some amount of hydrogen, which is much more reactive, is a promising strategy. In this study, the stability limits of technically-premixed ammonia-hydrogen-air flames are measured in a laboratory-scale swirl combustor for a wide range of ammonia fractions in the ammonia-hydrogen fuel blend. Results are compared to that obtained in the same combustor for reference methane-hydrogen-air mixtures. Data show that increasing the ammonia fraction in the fuel blend promotes lean blowout but reduces the flames’ propensity to flashback. The latter effect is even more pronounced if the volume fraction of ammonia in the fuel blend exceeds 0.7. In that case, increasing the equivalence ratio at a fixed bulk velocity does not yield flashback and rich blowout occurs instead, yielding a much wider range of stable equivalence ratios. This study also reports exhaust NO mole fractions, measured for large ranges of equivalence ratio and ammonia fraction in the fuel blend. Regardless of the ammonia fraction, data show that competitively low NO emissions occur for slightly rich equivalence ratios of φ ≥ 1.05, which is consistent with earlier studies. Stable flames and good NO performance are also found for very lean ammonia-hydrogen-air mixtures with φ ≤ 0.50, demonstrating the strong potential of fueling gas turbines with ammonia-hydrogen blends.
    Citation
    Khateeb, A. A., Guiberti, T. F., Zhu, X., Younes, M., Jamal, A., & Roberts, W. L. (2020). Stability limits and NO emissions of technically-premixed ammonia-hydrogen-nitrogen-air swirl flames. International Journal of Hydrogen Energy, 45(41), 22008–22018. doi:10.1016/j.ijhydene.2020.05.236
    Sponsors
    This work is supported by Saudi Aramco Research and Development Center under research agreement number RGC/3/3837-01-01 and by the King Abdullah University of Science and Technology under grant number BAS/1/1370-01-01.
    Publisher
    Elsevier BV
    Journal
    International Journal of Hydrogen Energy
    DOI
    10.1016/j.ijhydene.2020.05.236
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0360319920320917
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ijhydene.2020.05.236
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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