A numerical investigation of NOx formation in counterflow CH4/H2/air diffusion flames

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DOIResolve DOI: http://doi.org/10.1115/IMECE2006-14458
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Proceedings titleASME 2006 International Mechanical Engineering Congress and Exposition
ConferenceIMECE2006, 2006 ASME International Mechanical Engineering Congress & Exposition, November 5-10, 2006, Chicago, IL
Article numberIMECE2006-14458
Pages3137; # of pages: 7
SubjectDiffusion flame; NOx; Fuel enrichment
AbstractA detailed numerical study was carried out for the effect of hydrogen enrichment on flame structure and NOx formation in counterflow CH4 /air diffusion flames. Detailed chemistry and complex thermal and transport properties were employed. The enrichment fraction was changed from 0 (pure CH4 ) to 1.0 (pure H2 ). The result indicates that for flames with low to moderate stretch rates, with the increase of the enrichment fraction from 0 to 0.5~0.6, NO emission index keeps almost constant or only slightly increases. When the enrichment fraction is increased from 0.5~0.6 to about 0.9, NO emission index quickly increases, and finally NO formation decreases again when pure hydrogen flame condition is approached. However, for flames with higher stretch rates, with the increase of hydrogen enrichment fraction from 0 to 1.0, the formation of NO first quickly increases, then slightly decreases and finally increases again. Detailed analysis suggests that the variation of the characteristics in NO formation in stretched CH4 /air diffusion flames is caused by the change of flame structure and NO formation mechanism, when the enrichment fraction and stretch rate are changed.
Publication date
PublisherAmerican Society of Mechanical Engineers (ASME)
AffiliationNRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE); National Research Council Canada
Peer reviewedYes
NRC number51521
NPARC number7630842
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Record identifier9c82ba3a-b09c-4d8e-918b-917133aab371
Record created2009-10-02
Record modified2017-03-30
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