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    A numerical study on extinction and NOx formation in nonpremixed flames with syngas fuel

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    Type
    Article
    Authors
    Chun, Kangwoo
    Chung, Hun J.
    Chung, Suk Ho cc
    Choi, Jaehyuk
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-11-20
    Online Publication Date
    2011-11-20
    Print Publication Date
    2011-11
    Permanent link to this record
    http://hdl.handle.net/10754/561911
    
    Metadata
    Show full item record
    Abstract
    The flame structure, extinction, and NOx emission characteristics of syngas/air nonpremixed flames, have been investigated numerically. The extinction stretch rate increased with the increase in the hydrogen proportion in the syngas and with lower fuel dilution and higher initial temperature. It also increased with pressure, except for the case of highly diluted fuel at high pressure. The maximum temperature and the emission index of nitric oxides (EINOx) also increased in aforementioned conditions. The EINOx decreased with stretch rate in general, while the decreasing rate was found to be somewhat different between the cases of N2 and CO2 dilutions. The reaction paths of NOx formation were analyzed and represented as NO reaction path diagram. The increase in N radical resulted in larger NOx production at high initial temperature and pressure. As the pressure increases, EINOx increases slower due to the third-body recombination. The thermal NO mechanism is weakened for high dilution cases and non-thermal mechanisms prevail. The combustion conditions achieving higher extinction stretch rate can be lead to more NOx emission, therefore that the selection of optimum operation range is needed in syngas combustion. © 2011 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
    Citation
    Chun, K. W., Chung, H.-J., Chung, S. H., & Choi, J. H. (2011). A numerical study on extinction and NOx formation in nonpremixed flames with syngas fuel. Journal of Mechanical Science and Technology, 25(11), 2943–2949. doi:10.1007/s12206-011-0810-4
    Publisher
    Springer Nature
    Journal
    Journal of Mechanical Science and Technology
    DOI
    10.1007/s12206-011-0810-4
    ae974a485f413a2113503eed53cd6c53
    10.1007/s12206-011-0810-4
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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