Numerical simulation of thermal performance of a porous burner

Farzaneh, Meisam; Ebrahimi, Reza; Shams, Mehrzad; Shafiey, Mohammad

doi:10.1016/j.cep.2008.07.006

Cited by 22 publications

(15 citation statements)

References 20 publications

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“…10), it does not affect the combustion process. Therefore, the amount of emissions (CO and NO) predicted in the present work is almost the same as that was previously obtained from the modeling of the porous burner without the heat exchange [7]. This could be because of the incapability of the simple reaction mechanism employed here to predict possible reactions in the heat exchanger region.…”

Section: Resultsmentioning

confidence: 50%

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Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

et al. 2012

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In this paper, we perform a numerical analysis of a two-dimensional axisymmetric problem arising in premixed combustion in a porous burner with integrated heat exchanger. The physical domain consists of two zones, porous and heat exchanger zones. Two dimensional Navier-Stokes equations, gas and solid energy equations, and chemical species transport equations are solved and heat release is described by a multistep kinetics mechanism. The solid matrix is modeled as a gray medium, and the finite volume method is used to solve the radiative transfer equation to calculate the local radiation source/sink in the solid phase energy equation. Special attention is given to model heat transfer between the hot gas and the heat exchanger tube. Thus, the corresponding terms are added to the energy equations of the flow and the solid matrix. Gas and solid temperature profiles and species mole fractions on the burner centerline, predicted 2D temperature fields, species concentrations and streamlines are presented. Calculated results for temperature profiles are compared to experimental data. It is shown that there is good agreement between the numerical solutions and the experimental data and it is concluded that the developed numerical program is an excellent tool to investigate combustion in porous burner. List of symbols c pSpecific heat of the fluid (J kgof reactions N s Number of chemical species N T Number of particles per unit volume (m -3 ) Nu Nusselt number (-) p Pressure (N m -2 ) Pr Prandtl number (-) q Radiant heat flux (W m -2 ) R Universal gas constant (J kg -1 K -1 ) R i Rate of reaction i R contact Thermal contact resistance (m 2 K W -1 ) R t Total thermal resistance (m 2 K W -1 ) Re Reynolds number, /qVd p l -1 r Radial coordinate (m) r i Inside tube diameter (m) r o Outside tube diameter (m) s Radiative geometry path length (m) s Unit vector (-) T Temperature (K) u Axial velocity (m s -1 ) V Velocity vector (m/s) v Radial velocity (m s -1 ) W Molecular weight (kg kmole -1 )

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Section: Resultsmentioning

confidence: 50%

“…The grid independency of the solution was shown in the previous work by the authors Farzaneh et al [7]. Pressure and velocity are coupled by the SIMPLE algorithm [25].…”

Section: Numerical Proceduresmentioning

confidence: 96%

Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

et al. 2012

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“…As the equivalence ratio increases, the flame moves from the intermediate section of the burner to the interface between 60-PPI and 10-PPI ceramic foams in the 60-10 PPI-13 mm burner. In addition, the peak temperature increases with the equivalence ratio [11,47]. The increase of equivalence ratio results in more combustion heat, which can be transferred upstream through the porous media.…”

Section: Resultsmentioning

confidence: 97%

Combustion characteristics of low-concentration coal mine methane in ceramic foam burner with embedded alumina pellets

Dai

Lin

et al. 2015

Applied Thermal Engineering

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“…and Akbari. 19,20 Periera et al. analytically studied the effect of matrix on combustion characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effects of foam structure and material on the performance of premixed porous ceramic burner

Shakiba

Ebrahimi

Shams

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part A:

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An experimental setup was developed to investigate the physical characteristics of ceramic foam, used in reaction layer, on the performance of a porous burner. This premixed burner included mainly four sections: premixed, preheating, combustion zone and an integrated heat exchanger. The objective of this work was to investigate effects of different kinds of ceramic foams with various porosity, pore density and materials on the burner performance. The combustor was operated with natural gas and diverse structures of alumina and silicon carbide foam utilized in the reaction layer. Temperature distribution along the centerline, thermal efficiency, emission concentration and pressure drop were thoroughly investigated. Results showed a decrease in the porosity of ceramic foams, causing emission and pressure drop to increase while efficiency declined. More stable combustion was achieved by using finer foams with higher pore density. These foams indicated lower pollution and higher efficiency in low excess air, while coarser foams—ceramic foams with low pore density—resulted in lower pollution and higher efficiency in high excess air. Investigation effect of material exhibited silicon carbide foams causing higher temperature of the combustion and more temperature variation through the burner. Generally, material effect was negligible in terms of efficiency. But role of material highlighted in pollution where silicon carbide resulted in higher amount of NO.

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Numerical simulation of thermal performance of a porous burner

Cited by 22 publications

References 20 publications

Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

Combustion characteristics of low-concentration coal mine methane in ceramic foam burner with embedded alumina pellets

Effects of foam structure and material on the performance of premixed porous ceramic burner

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