A numerical study on the effect of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames

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DOIResolve DOI: http://doi.org/10.1016/j.combustflame.2008.07.009
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TypeArticle
Journal titleCombustion and Flame
Volume156
Issue2
Pages477483; # of pages: 7
SubjectFuel enrichment; Hydrogen; Reformate gas; Super-adiabatic temperature; NOx
AbstractThis paper investigates the effects of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames by numerical simulation. The results reveal that flame temperature changes due to the combined effects of adiabatic temperature, fuel Lewis number and radiation heat loss, when hydrogen/reformate gas is added to the fuel of a methane/air diffusion flame. The effect of Lewis number causes the flame temperature to increase much faster than the corresponding adiabatic equilibrium temperature when hydrogen is added, and results in a qualitatively different variation from the adiabatic equilibrium temperature as reformate gas is added. At some conditions, the addition of hydrogen results in a super-adiabatic flame temperature. The addition of hydrogen/reformate gas causes NO formation to change because of the variations in flame temperature, structure and NO formation mechanism, and the effect becomes more significant with increasing strain rate. The addition of a small amount of hydrogen or reformate gas has little effect on NO formation at low strain rates, and results in an increase in NO formation at moderate or high strain rates. However, the addition of a large amount of hydrogen increases NO formation at all strain rates, except near pure hydrogen condition. Conversely, the addition of a large amount of reformate gas results in a reduction in NO formation.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology (ICPET-ITPCE); National Research Council Canada
Access conditionavailable
unlimited
public
Peer reviewedYes
NRC number51514
NPARC number6428770
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Record identifier183436f7-975e-4834-897a-9c5ee8787801
Record created2009-10-02
Record modified2016-05-09
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