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

Handle URI:
http://hdl.handle.net/10754/561911
Title:
A numerical study on extinction and NOx formation in nonpremixed flames with syngas fuel
Authors:
Chun, Kangwoo; Chung, Hun J.; Chung, Suk-Ho ( 0000-0001-8782-312X ) ; Choi, Jaehyuk
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.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Combustion and Laser Diagnostics Laboratory
Publisher:
Springer Nature
Journal:
Journal of Mechanical Science and Technology
Issue Date:
Nov-2011
DOI:
10.1007/s12206-011-0810-4
Type:
Article
ISSN:
1738494X
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorChun, Kangwooen
dc.contributor.authorChung, Hun J.en
dc.contributor.authorChung, Suk-Hoen
dc.contributor.authorChoi, Jaehyuken
dc.date.accessioned2015-08-03T09:33:55Zen
dc.date.available2015-08-03T09:33:55Zen
dc.date.issued2011-11en
dc.identifier.issn1738494Xen
dc.identifier.doi10.1007/s12206-011-0810-4en
dc.identifier.urihttp://hdl.handle.net/10754/561911en
dc.description.abstractThe 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.en
dc.publisherSpringer Natureen
dc.subjectEINOxen
dc.subjectExtinctionen
dc.subjectNO reaction path diagramen
dc.subjectStretch rateen
dc.subjectSyngasen
dc.titleA numerical study on extinction and NOx formation in nonpremixed flames with syngas fuelen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentCombustion and Laser Diagnostics Laboratoryen
dc.identifier.journalJournal of Mechanical Science and Technologyen
dc.contributor.institutionEnergy Environment Industrial Business Center, Korea Register of Shipping, Daejeon 305-333, South Koreaen
dc.contributor.institutionEnergy Efficiency and Resources Team, Korea Institute of Energy Technology Evaluation and Planning, Seoul 135-280, South Koreaen
dc.contributor.institutionKorea Maritime University, 1 Dongsam-dong, Youngdo-gu, Busan 606-791, South Koreaen
kaust.authorChung, Suk-Hoen
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