Numerical Simulation of Combustion of Natural Gas With High-Temperature Air

Orsino, Stefano; Weber, Roman; Bollettini, Ugo

doi:10.1080/00102200108907848

Cited by 83 publications

(48 citation statements)

References 19 publications

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“…National and international R&D of MILD combustion Investigators from Germany [2,[23][24][25][26][27] and Japan [5,6,28] appeared to first conduct the research and development (R&D) on the MILD combustion, followed by those from Sweden [29][30][31][32][33][34][35], Italy [4,27,[36][37][38][39][40][41][42], the Netherlands [43] , France, Australia [12][13][14][15][16][17][18][19][20][21][22], the United States [44,45] and China [8][9][10][11][12][46][47][48][49][50][51]…”

Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

Progress and recent trend in MILD combustion

Dally

et al. 2011

Sci. China Technol. Sci.

145

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Moderate or intense low oxygen dilution (MILD) combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency needs. However, due to the lack of the fundamental knowledge on this combustion, there is a misconception that MILD combustion should be established by high preheating of the air, which has limited its application. Our research and development on this combustion has been performed for several years. We have found that the requirements for establishing the MILD combustion are more relaxed than previously. It is also revealed that this combustion of different type, i.e., non-premixed, partially premixed and fully premixed, can be achieved by firing various fuels (i.e., gaseous, liquid and solid fuels). It is suggested that the application of the MILD combustion can be expanded significantly. The present review summarizes the progress and recent trend made in the R&D of this combustion and recommends further fundamental studies for improving our knowledge and widening its applications. high temperature air combustion, flameless oxidation, flameless combustion, oxy-fuel combustion Citation: Li P F, Mi J C, Dally B B, et al. Progress and recent trend in MILD combustion.

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Section: The Origin Of Mild Combustion Technologymentioning

confidence: 99%

Progress and recent trend in MILD combustion

Dally

et al. 2011

Sci. China Technol. Sci.

145

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“…MILD combustion is a new combustion technology that produces lower pollution emissions and increases thermal efficiency (Cavaliere & de Joannon, 2004;Dally, Karpetis, & Barlow, 2002;Noor, Wandel, & Yusaf, 2013a). This combustion is also called flameless oxidation or FLOX (Mancini, Schwoppe, Weber, & Orsino, 2007;Wünning, 1991), low NOx (Orsino, Weber, & Bollettini, 2001) and high-temperature air combustion (HiTAC) (Katsuki & Hasegawa, 1998;Tsuji, Gupta, & Hasegawa, 2003). MILD combustion has been investigated experimentally (Li, Mi, Dally, Craig, & Wang, 2011;Rafidi & Blasiak, 2006) and numerically (Noor, Wandel, & Yusaf, 2012c;Parente, Galletti, & Tognotti, 2011;Szegö, Dally, & Christo, 2011) in various industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Design and Development of MILD Combustion Burner

Noor¹,

Wandel²,

Yusaf³

2012

J MECH ENG SCI

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This paper discusses the design and development of the Moderate and Intense Low oxygen Dilution (MILD) combustion burner using Computational Fluid Dynamics (CFD) simulations. The CFD commercial package was used to simulate preliminary designs for the burner before the final design was sent to the workshop for fabrication. The burner is required to be a non-premixed and open burner. To capture and use the exhaust gas, the burner was enclosed within a large circular shaped wall with an opening at the top. An external EGR pipe was used to transport the exhaust gas which was mixed with the fresh oxidant. To control the EGR and exhaust flow, butterfly valves were installed at the top opening as a damper to close the exhaust gas flow at a certain ratio for EGR and exhaust out to the atmosphere. High temperature fused silica glass windows were installed to view and capture images of the flame and analyze the flame propagation. The burner simulation shows that MILD combustion was achieved for the oxygen mole fraction of 3-13%. The final design of the burner was fabricated and ready for the experimental validation.

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“…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%

“…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). 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.…”

Section: Introductionmentioning

confidence: 99%

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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Numerical Simulation of Combustion of Natural Gas With High-Temperature Air

Cited by 83 publications

References 19 publications

Progress and recent trend in MILD combustion

Progress and recent trend in MILD combustion

Design and Development of MILD Combustion Burner

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

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