Comparison of Different Global Reaction Mechanisms for MILD Combustion of Natural Gas

Kim, Ju Pyo; Schnell, Uwe; Scheffknecht, G.

doi:10.1080/00102200701838735

Cited by 111 publications

(61 citation statements)

References 33 publications

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“…We have compared the predictions of SKE, RKE, RNG and SKE with modified model constants in combination with the EDC model with the Correa chemical mechanism [26]. It is found that the differences between the models are larger at Re = 8,800 then at Re = 4,100.…”

Section: Prediction Of Velocity Statisticsmentioning

confidence: 99%

“…MILD combustion has also been studied in laboratory scale furnaces [17][18][19][20][21][22][23][24][25][26][27] and semi-industrial scale furnaces. For example, Orsino and Weber [24] investigated a semi-industrial scale burner using three different turbulent-chemistry interaction models (Eddy Break up Model (EBU), Eddy Dissipation Concept (EDC) and presumed PDF with equilibrium chemistry).…”

Section: Introductionmentioning

confidence: 99%

“…They reported that all of these three models were capable of predicting the main flow characteristics properly, such as temperature fields, high radiative flux and low NOx and CO. Mancini et al [25] had found that prediction of the entrainment by jets is a crucial element for successful modeling of MILD combustion burners. Kim et al [26] studied the effects of different global reaction mechanisms for modeling MILD combustion of natural gas. More recently, the experimental and numerical investigation by Danon et al [27] reported an industrial scale FLOX™ burner firing at low calorific value gases.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Delft-Jet-in-Hot-Coflow (DJHC) Flames Using the Eddy Dissipation Concept Model for Turbulence–Chemistry Interaction

Oldenhof

Sathiah

et al. 2011

Flow Turbulence Combust

186

173

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In this paper, we report results of a numerical investigation of turbulent natural gas combustion for a jet in a coflow of lean combustion products in the Delft-Jet-in-Hot-Coflow (DJHC) burner which emulates MILD (Moderate and Intense Low Oxygen Dilution) combustion behavior. The focus is on assessing the performance of the Eddy Dissipation Concept (EDC) model in combination with two-equation turbulence models and chemical kinetic schemes for about 20 species (Correa mechanism and DRM19 mechanism) by comparing predictions with experimental measurements. We study two different flame conditions corresponding to two different oxygen levels (7.6% and 10.9% by mass) in the hot coflow, and for two jet Reynolds number (Re = 4,100 and Re = 8,800). The mean velocity and turbulent kinetic energy predicted by different turbulence models are in good agreement with data without exhibiting large differences among the model predictions. The realizable k-ε model exhibits better performance in the prediction of entrainment. The EDC combustion model predicts too early ignition leading to a peak in the radial mean temperature profile at too low axial distance. However the model correctly predicts the experimentally observed decreasing trend of lift-off height with jet Reynolds number. A detailed analysis of the mean reaction rate of the EDC model is made and as possible cause for the deviations between model predictions and experiments a low turbulent Reynolds number effect is identified. Using modified EDC model constants prediction of too early ignition can be avoided. The results are weakly sensitive to the sub-model for laminar viscosity and laminar diffusion fluxes.

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Section: Prediction Of Velocity Statisticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation of Delft-Jet-in-Hot-Coflow (DJHC) Flames Using the Eddy Dissipation Concept Model for Turbulence–Chemistry Interaction

Oldenhof

Sathiah

et al. 2011

Flow Turbulence Combust

186

173

View full text Add to dashboard Cite

show abstract

“…It was thus possible to obtain CFD and plug-flow reactor results more adherent to the experimental data. Yin et al (2011) in the CFD simulations of a furnace fueled by natural gas under oxy-combustion conditions, successfully used the same WD modified by Andersen et al (2009) and a modified version of the JL proposed by Kim et al (2008). Wang et al (2012) conducted plug-flow reactor and CFD analysis, using different versions of the WD and the JL and concluding that the results that well matched with the experimental data were obtained with the WD version of Andersen et al with the addition of the H2 oxidation reaction proposed by Marinov et al (1996).…”

Section: Oxy-combustion Chemistry and Reaction Mechanismsmentioning

confidence: 99%

Micro Gas Turbine Combustor Performances in CO2/O2 Oxidizer Atmosphere

Nardo¹,

Calchetti²

2017

JAFM

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In fossil fuel energy power plants the oxy-combustion technique, is one of the possible approaches to the problem of greenhouse gases emissions, through the CO2 capture and subsequent storage. It is realized using recirculated flue gas enriched with oxygen as oxidizer and it is suitable more than other techniques to retrofit existing plants. The commercial gas turbine combustors currently available are however designed and optimized for air combustion. In this work, through a series of CFD simulations, a typical commercial micro turbine burner has been tested in oxy-combustion conditions, in order to verify the performances. Through this study it has been shown how these class of combustors cannot be used in an optimal way in terms of efficiency, pollutant emissions and oxygen consumption. Some possible solutions have been also proposed.

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“…Obviously, a detailed mechanism involving a large number of species and reactions requires high computational costs and performs highly resolved simulation slowly, which in turn a global mechanism is required to predict the combustion characteristics in great accuracy with limited processing resources (Kim et al, 2008). Global chemistry models are often implemented in large-scale simulations of combustion in nuclear power plants (Manninen et al, 2002;Baraldi et al, 2007;Kim and Hong, 2015;San Marchi et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Hydrogen Combustion: Global Reaction Model and Validation

Zhang

Liu

2017

Front. Energy Res.

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Due to the complexity of modeling the combustion process in nuclear power plants, the global mechanisms are preferred for numerical simulation. To quickly perform the highly resolved simulations with limited processing resources of large-scale hydrogen combustion, a method based on thermal theory was developed to obtain kinetic parameters of global reaction mechanism of hydrogen-air combustion in a wide range. The calculated kinetic parameters at lower hydrogen concentration (C hydrogen < 20%) were validated against the results obtained from experimental measurements in a container and combustion test facility. In addition, the numerical data by the global mechanism (C hydrogen > 20%) were compared with the results by detailed mechanism. Good agreement between the model prediction and the experimental data was achieved, and the comparison between simulation results by the detailed mechanism and the global reaction mechanism show that the present calculated global mechanism has excellent predictable capabilities for a wide range of hydrogen-air mixtures.

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Comparison of Different Global Reaction Mechanisms for MILD Combustion of Natural Gas

Cited by 111 publications

References 33 publications

Numerical Simulation of Delft-Jet-in-Hot-Coflow (DJHC) Flames Using the Eddy Dissipation Concept Model for Turbulence–Chemistry Interaction

Numerical Simulation of Delft-Jet-in-Hot-Coflow (DJHC) Flames Using the Eddy Dissipation Concept Model for Turbulence–Chemistry Interaction

Micro Gas Turbine Combustor Performances in CO2/O2 Oxidizer Atmosphere

Numerical Simulation of Hydrogen Combustion: Global Reaction Model and Validation

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