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Investigation on the chemical effects of dimethyl ether and ethanol additions on PAH formation in laminar premixed ethylene flames

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  • Additional Information
    • Contributors:
      King Abdullah University of Science and Technology (KAUST), Clean Combustion Research Center, Thuwal 23955-6900, Saudi Arabia; Key Laboratory for Power Machinery and Engineering of Ministry of Education, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    • Publication Information:
      Elsevier BV
    • Publication Date:
      2019
    • Collection:
      King Abdullah University of Science and Technology: KAUST Repository
    • Abstract:
      This paper presents a comparative study focusing on the chemical effects of dimethyl ether (DME) and ethanol (EtOH) on PAH formation in fuel-rich laminar premixed ethylene flames using laser-induced fluorescence (LIF) diagnostic. To investigate the chemical effects, the equivalence ratios, dilution ratios, and temperature profiles were kept nearly constant while DME and EtOH were separately blended into the ethylene-base flame. The LIF testing data showed that the PAH formation was observably suppressed by the DME and EtOH additions, and DME was much more effective at suppressing the PAH formation than EtOH. To reveal the mechanism of the inhibiting effects of oxygenated fuels on PAH formation, chemical kinetic analysis was conducted. The model results captured the variation tendency of PAHs observed in experiments and indicated that the decreased concentration of carbon which was available to form the first aromatic ring (benzene) is the main reason for PAH reduction with EtOH and DME additions. Moreover, during the growth process from benzene to PAHs, the C2H2-addition reactions, which played a key role in the formation of new aromatic rings, were suppressed due to less C2H2 formed in EtOH and DME addition flames. There was less C2H2 produced from DME than that from EtOH, therefore, DME had a stronger inhibiting effect than EtOH on PAH formation in laminar premixed ethylene flames. ; This work was funded by the National Natural Science Foundation of China (91441129, 51210010) and the National Key R&D Program of China (2016YFC0208000).
    • Relation:
      https://linkinghub.elsevier.com/retrieve/pii/S0016236119311615; Zhang, Y., Li, Y., Liu, P., Zhan, R., Huang, Z., & Lin, H. (2019). Investigation on the chemical effects of dimethyl ether and ethanol additions on PAH formation in laminar premixed ethylene flames. Fuel, 256, 115809. doi:10.1016/j.fuel.2019.115809; Fuel; http://hdl.handle.net/10754/656758
    • Accession Number:
      10.1016/j.fuel.2019.115809
    • Online Access:
      http://hdl.handle.net/10754/656758
      https://doi.org/10.1016/j.fuel.2019.115809
    • Rights:
      NOTICE: this is the author’s version of a work that was accepted for publication in Fuel. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Fuel, [[Volume], [Issue], (2019-08-13)] DOI:10.1016/j.fuel.2019.115809 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ ; 2021-08-13
    • Accession Number:
      edsbas.C57C83DD