Numerical study on the influence of hydrogen addition on soot formation in a laminar ethylene–air diffusion flame

Guo, Hongsheng; Liu, Fengshan; Smallwood, Gregory J.; Gülder, Ömer L.

doi:10.1016/j.combustflame.2005.10.016

Cited by 173 publications

(121 citation statements)

References 17 publications

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“…It has been shown that hydrogen enrichment can improve flame stability and thus reduce NO x f o r m a t i o ni np r e m i x e dfl a m e s [1][2][3][4][5], as well as increase burning velocity [6][7][8]. For diffusion combustion, hydrogen enrichment can suppress the formation of soot particles [9,10] and shorten ignition delay [11,12].…”

Section: Introductionmentioning

confidence: 99%

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

Guo¹,

Neill²

2009

Combustion and Flame

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A numerical study on the effect of hydrogen/reformate gas addition on flame temperature and NO formation in strained methane/air diffusion flames Guo, Hongsheng; Neill, W. Stuart This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. This 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.Crown

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Section: Introductionmentioning

confidence: 99%

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

Guo¹,

Neill²

2009

Combustion and Flame

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“…When syngas 1 fraction increased, the combustion temperature decreased owing to the significant content of inert components and incomplete combustion of H 2 and CO, which resulted in a decrease in soot oxidation rate. Meanwhile, the increase in syngas 1 fraction also caused a decrease in soot formation rate, since all components of syngas suppressed soot formation when mixed with hydrocarbon fuels due to the combined dilution and thermal effects [14][15][16]. When a small amount of diesel fuel was substituted with syngas 1, the decrease in soot oxidation rate was similar to or slightly more significant than the decrease in soot formation rate, which led to little change or a slight increase in soot emissions.…”

Section: Effect Of Syngas 1 Fraction On Engine Performancementioning

confidence: 99%

“…However, CO chemically promotes soot formation while H 2 chemically suppresses soot formation when they are mixed with other hydrocarbon fuels [14,16]. Although the dilution effect is usually much more significant than the chemical effect [14][15][16], the combined dilution and chemical effect of CO is less significant than that of H 2 in terms of decrease in soot formation rate. As a result, the substitution of diesel by syngas 5 caused less soot emissions than that of syngas 1, since the H 2 /CO ratio in syngas 5 was higher.…”

Section: Effect Of H 2 /Co Ratio On Energy Efficiency and Emissionsmentioning

confidence: 99%

The Combustion and Emissions Performance of a Syngas-Diesel Dual Fuel Compression Ignition Engine

Guo

Neill

Liko

2016

ASME 2016 Internal Combustion Engine Division Fall Technical Conference

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=b2d8b745-6b68-41e4-9667-1ad91fbe6820 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=b2d8b745-6b68-41e4-9667-1ad91fbe6820 ABSTRACTRemote communities in Canada heavily rely on reciprocating diesel generators for heat and power generation. These engines utilize diesel fuel that is imported at great expense and generate green-house gas (GHG) and pollutant emissions. Replacing diesel fuel in these engines by syngas derived from a thermo-chemical treatment of local renewable biomass can not only lower the fuel cost but also reduce GHG and pollutant emissions for remote communities. Besides, syngas-diesel dual fuel combustion can maintain the ability to revert back to diesel operation and therefore ensure reliable heat and power supply when syngas is not available.In this study, the combustion and emissions performance of a syngas-diesel dual fuel engine was investigated at low and medium loads. A single cylinder direct injection diesel engine was modified to operate using a dual fuel strategy. The diesel fuel was directly injected to the cylinder, while syngas was injected into the intake port. The effects of syngas fraction and composition on energy efficiency, cylinder pressure, exhaust temperature, and combustion stability were recorded and analyzed. The emissions data, including PM, NO x , CO, and unburned hydrocarbon, were also analyzed and reported in the paper.The results suggest that the substitution of diesel by a syngas caused a slight decrease in brake thermal efficiency and an increase in CO emissions. The effect of a syngas on soot emissions depended on the composition and/or quality. The inert component content of a syngas significantly affected NO x emissions in a syngas-diesel dual fuel internal combustion engine.

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“…For example, it has been shown that fuel enrichment can improve flame stability and thus significantly reduce NO X formation by allowing a combustor to operate at leaner condition [1][2][3][4] in premixed flames. For diffusion combustion, fuel enrichment can suppress the formation of soot particles [5,6] and shorten ignition delay [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen was selected because it has been shown to be an effective enrichment component that can suppress soot formation in diffusion flames [5,6] and shorten ignition delay [7,8]. The fraction of hydrogen changed from 0 to 1.0.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of NOx Formation in Counterflow CH4/H2/Air Diffusion Flames

Guo

Neill

Smallwood

2006

Heat Transfer, Volume 2

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=9c82ba3a-b09c-4d8e-918b-917133aab371 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=9c82ba3a-b09c-4d8e-918b-917133aab371 ABSTRACTA detailed numerical study was carried out for the effect of hydrogen enrichment on flame structure and NO X formation in counterflow CH 4 /air diffusion flames. Detailed chemistry and complex thermal and transport properties were employed. The enrichment fraction was changed from 0 (pure CH 4 ) to 1.0 (pure H 2 ). 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 CH 4 /air diffusion flames is caused by the change of flame structure and NO formation mechanism, when the enrichment fraction and stretch rate are changed.

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Numerical study on the influence of hydrogen addition on soot formation in a laminar ethylene–air diffusion flame

Cited by 173 publications

References 17 publications

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

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

The Combustion and Emissions Performance of a Syngas-Diesel Dual Fuel Compression Ignition Engine

A Numerical Investigation of NOx Formation in Counterflow CH4/H2/Air Diffusion Flames

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