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    Effects of ammonia and hydrogen on the sooting characteristics of laminar coflow flames of ethylene and methane

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    Name:
    NH3_fuel_V2[1].pdf
    Size:
    2.165Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2023-09-10
    Download
    Type
    Article
    Authors
    Steinmetz, S.A.
    Ahmed, H.A.
    Boyette, Wesley cc
    Dunn, M.J.
    Roberts, William L. cc
    Masri, A.R.
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    high-pressure combustion (HPC) Research Group
    Date
    2021-09-10
    Online Publication Date
    2021-09-10
    Print Publication Date
    2022-01
    Embargo End Date
    2023-09-10
    Submitted Date
    2021-07-07
    Permanent link to this record
    http://hdl.handle.net/10754/671150
    
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    Show full item record
    Abstract
    Hydrogen and its derivatives, including ammonia, are gaining increasing attention as carbon-neutral fuel alternatives. An intermediate step in the transition to hydrogen and ammonia is the blending of these fuels with hydrocarbons, introducing the challenge of soot formation. The impact of ammonia on soot formation has recently been the focus of several studies, but a complete understanding of its chemical effects is lacking. Hydrogen, by comparison, has received significant attention from the soot community. However, controversy remains with regards to hydrogen’s chemical impact, and the dependence of this impact on fuel and flame configuration. This work investigates the effect of both hydrogen and ammonia on soot formation in laminar coflow flames of both ethylene and methane. Hydrogen or ammonia are introduced either by addition or substitution, with parallel studies of helium and argon, in order to isolate their chemical effects. Time- and spectrally-resolved laser-induced emissions from UV and IR excitation are used to quantify differences in soot and soot precursor formation. Additionally, chemical kinetics calculations and analyses are used to elucidate the effects of ammonia introduction to ethylene flames. Ammonia is found to chemically inhibit soot when mixed with either ethylene or methane, with increasing effects on larger precursors. Calculations suggest that this suppression is due to carbon consumption in the formation of HCN and CN. Hydrogen is found to chemically enhance soot formation in both ethylene and methane flames.
    Citation
    Steinmetz, S. A., Ahmed, H. A., Boyette, W. R., Dunn, M. J., Roberts, W. L., & Masri, A. R. (2022). Effects of ammonia and hydrogen on the sooting characteristics of laminar coflow flames of ethylene and methane. Fuel, 307, 121914. doi:10.1016/j.fuel.2021.121914
    Sponsors
    This research was supported by the Australian Research Council and funding from King Abdullah University of Science and Technology (KAUST). Authors thank Prof. He Lin, from Shanghai Jiao Tong University, for providing the used chemical mechanism.
    Publisher
    Elsevier BV
    Journal
    Fuel
    DOI
    10.1016/j.fuel.2021.121914
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0016236121017919
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuel.2021.121914
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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