Flamelet-Modeling of Inverse Rich Diffusion Flames

Hunger, Franziska; Stelzner, Björn; Trimis, D.; Hasse, Christian

doi:10.1007/s10494-012-9422-z

Cited by 18 publications

(13 citation statements)

References 30 publications

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“…For combustion modelling, we use the steady laminar flamelet approach [12][13][14][15][16][17][18][19] in which the laminar flamelets are pre-computed via the detailed kinetic scheme of Qin [20]. The transport equations for the first two moment of mixture fractions are given by…”

Section: The Governing Equationsmentioning

confidence: 99%

The Control of Pollutant Emission from Syngas Flames Using the Oxidizer Dilution Approach

Darbandi¹,

Ghafourizadeh²,

Schneider³

2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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-In this work, we aim to control the emission of greenhouse gases from different syngas-fuel-based flames or the bluff-body stabilized turbulent flame. First, we validate our numerical analysis by solving a benchmark test case using the detailed-chemistry and compare our obtained results with those of experiment. The benchmark test case is fed with a syngas fuel. The comparison shows that our numerical analysis can predict the structure of benchmark flame very well. Second, we simulate the test case with fuelling the same flame; however, fed with different syngas fuels. Then, we compare their achieved greenhouse gas emissions with each other. We feed the flame with different syngas fuels produced from biomass, wood waste, and turkey feathers. Considering these different syngas fuels, we extend the scope of this study and simulate these flames under different conditions of oxidizer dilution. In other words, we dilute the oxidizer by feeding extra nitrogen and report the greenhouse gases emitted from these flames. The comparison is performed to demonstrate the effect of extra nitrogen dilution on their pollution emissions. Our findings show that the dilution of oxidizer (by feeding extra nitrogen) will considerably affect the pollutants emission form these flames. The current study also shows that the emission of carbon monoxide CO would be seriously reduced using the extra nitrogen dilution technique.

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Section: The Governing Equationsmentioning

confidence: 99%

The Control of Pollutant Emission from Syngas Flames Using the Oxidizer Dilution Approach

Darbandi¹,

Ghafourizadeh²,

Schneider³

2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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“…3.1, with further details given in [17,22,33]. The modeling approach for the turbulent flame is explained in Sec.…”

Section: Numerical Approachmentioning

confidence: 99%

“…The latter has already been successfully applied in oxy-fuel combustion [17]. Laminar simulations are performed with an in-house solver [17,22,33] based on OpenFOAM R 2.1. The inner jet is assumed to have a Hagen-Poiseuille velocity profile and the coflow velocity is set to a block profile.…”

Section: Laminar Flamementioning

confidence: 99%

“…However, oxy-fuel combustion processes offer advantages such as increased thermal efficiency, higher processing rates, reduced flue gas volumes and reduced pollutant emissions at higher oxygen concentrations [4,47]. Oxy-fuel flames are prone to differential diffusion effects [22,49], complex radiation [11,29,51], higher flame temperatures [27,52] and an alteration of the chemical path when CO 2 is added [38]. Further, the experimental investigation of such systems can become more complicated.…”

Section: Introductionmentioning

confidence: 99%

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A Combined Experimental and Numerical Study of Laminar and Turbulent Non-piloted Oxy-fuel Jet Flames Using a Direct Comparison of the Rayleigh Signal

Hunger

Zulkifli

Williams

et al. 2015

Flow Turbulence Combust

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“…The diffusion transport was modeled with the full multicomponent approach and thermal diffusion was included by the reason of high temperature regime near 3000 K [32]. All calculations were carried out at atmospheric pressure and inlet gas temperatures of 300 K. …”

Section: Numerical Approachmentioning

confidence: 99%

Analysis of Structure, Extinction and Broadening in Oxygen-Enhanced Non-Premixed Flames

Stelzner

Hunger

Voss

et al. 2015

Zeitschrift Für Physikalische Chemie

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Abstract:In the present numerical study laminar oxygen-enhanced and oxyfuel CH 4 /N 2 -O 2 /N 2 non-premixed flames were systematically investigated in counter-flow configuration. The compositions of the fuel and the oxidizer stream were chosen in a way, which allows a study of the flame structure at different flame temperatures in a range of approximately 1800-3000 K at constant stoichiometric mixture fraction of st = 0.2. The calculations were performed with the GRI 3.0 as a base kinetic mechanism, while selected cases were also investigated with the Appel et al. mechanism and the GDFkin ® 3.0. The flame structure, extinction and flame broadening effects were investigated for various strain rates by analysing the heat release rate and temperature profiles. Four different heat release rate zones were identified, namely the radical chain branching, the main water and carbon dioxide formation, the fuel oxidation and the fuel pyrolysis zone. While those zones overlap in case of air-combustion, a separation accompanied by a flame broadening is found in oxygen-enhanced flames as a result of the higher flame temperatures. The four heat release zones get affected dissimilarly by increased oxygen content and flame temperature, while the flame broadening is dominated by the shift of the radical branching zone towards the oxidizer side. A comparison between air combustion and pure oxygen combustion shows that the flame is broadened by a factor of approximately 10 as long as the flame conditions are not close to the extinction limits. With increasing strain rate flame extinction starts from the oxidizer side. An increased radical pool and temperature level in the chain branching zone extents the extinction limits towards higher strain rates in oxygen-enhanced flames. On the fuel side, the increased oxygen-content with the associated higher temperature level leads to a strong endothermic zone and an intense activation of the C 2 -pathway.

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Flamelet-Modeling of Inverse Rich Diffusion Flames

Cited by 18 publications

References 30 publications

The Control of Pollutant Emission from Syngas Flames Using the Oxidizer Dilution Approach

The Control of Pollutant Emission from Syngas Flames Using the Oxidizer Dilution Approach

A Combined Experimental and Numerical Study of Laminar and Turbulent Non-piloted Oxy-fuel Jet Flames Using a Direct Comparison of the Rayleigh Signal

Analysis of Structure, Extinction and Broadening in Oxygen-Enhanced Non-Premixed Flames

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