Numerical and experimental investigation of matrix-stabilized methane/air combustion in porous inert media

Brenner, Günther; Pickenäcker, K.; Pickenäcker, O.; Trimis, D.; Wawrzinek, K.; Weber, T.

doi:10.1016/s0010-2180(00)00163-2

Cited by 166 publications

(74 citation statements)

References 15 publications

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“…P 3 The ratio of convection between two phases to solid radiation, hAL x =T 3 g0 P 4 The ratio of combustion heat to solid radiation, L x _ Q=T 4 g0 P 5 The ratio of solid conduction to solid radiation, k p =T 3 g0 L x P 6 The ratio of gas convection to gas conduction at boundaries, h wg L x =k p P 7 The …”

Section: Nomenclaturementioning

confidence: 99%

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Numerical simulation of porous radiant burners under transient condition

2017

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Abstract. The purpose of this study is to analyze two-dimensional rectangular porous radiant burners in order to investigate the thermal characteristics of this type of burners in starting time period. Since the solid and gas phases are not in thermal equilibrium, two separate energy equations for these two phases are solved numerically with alternative direction implicit scheme. The gas is considered non-radiative medium, and for computation of radiative heat ux through the solid phase, the Radiative Transfer Equation (RTE) is employed and solved using the Discrete Ordinates Method (DOM). It is obtained that, due to the dominant radiation e ects, the required time to reach the steady gas temperature is very low. Furthermore, the e ects of optical thickness and scattering albedo on the performance of Porous Radiant Burner (PRB) are investigated.

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Section: Nomenclaturementioning

confidence: 99%

“…In order to optimize the combustion process, Brenner et al [7] studied a 2-D pseudo homogeneous porous burner in 2000. They did not consider any radiation model, such that the radiative part has been a ected by the experimental value of the e ective thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of porous radiant burners under transient condition

2017

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“…The first method 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics considers forming two layers of the porous media in which the modified Peclet number is less than (first layer) or greater than (second layer) 65 [1-3, 8, 10-12]. The second method considers cooling the post-combustion zone [13,14]. The third method enables retaining the flame in a specific zone of the porous media by periodically exchanging the mixture inlet and exhausting the combustion gases [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Filtration Gas Combustion in a Porous Ceramic Annular Burner for Thermoelectric Power Conversion

Bubnovich

Martin

Henríquez

et al. 2018

Heat Transfer Engineering

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A numerical study of the combustion of lean methane/air mixtures in a porous media burner is performed using a novelty geometry, cylindrical annular space. The combustion process takes place in the porous annular space located between two pipes, which are filled with alumina beads of 5.6 mm diameter (Al 2 O 3 ) forming a porosity of 0.4. The outer tube diameter of 3.82 cm is isolated; meanwhile the inner tube of 2 cm in diameter is covered by a continuous set of thermoelectric elements (TEE) for transforming heat energy into electricity. To achieve and maintain the proper temperature gradient on TEE, convective heat losses are considered from the TEE. The respective heat transfer coefficient is variable and is in the range 800 < h < 1500 [W / m 2 ]. The 2D mathematical model includes the energy equations for solid and gas phases, the momentum equations, the continuity equation, the fuel mass conservation, the perfect gas law and it is solved by Means of computational simulations in COMSOL Multiphysics. Computer simulations focus on the two-dimensional temperature analysis and displacement dynamics of the combustion front inside the reactor, depending on the values of the filtration velocity (0.1 < u g0 < 1.0, m/s) and the fuel equivalence ratio (0.06 < Φ < 0. The study shows that the cylindrical annular geometry can be used for converting the energy of combustion from lean gas mixtures into electricity, with a performance similar to the specified by manufacturers of TEEs. INTRODUCTIONThe need to lower emissions and increase efficiency in fossil fuel combustion has driven the search of new combustion methods and advanced burner designs. A porous media burner can provide a good solution due to a number of advantages compared to conventional free-flame combustion, such as large power variation range, high efficiency, compact structure with very high energy concentration per unit volume, extremely low CO and NO x emissions over a wide range of thermal loads, stable combustion over a wide range of equivalence ratios, 0.4 < Φ < 0.9 [1][2][3]. All the arguments mentioned above have driven the current development of these kinds of burners, which have already found several important industrial applications [4-

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“…They found that the CO emissions are under predicted and the NO emissions are over predicted, especially for richer mixtures. Brenner et al [12] dedicated an experimental and two-dimensional numerical simulation of combustion in porous inert media. They compared the calculated 2D temperature fields and species concentrations of premixed methane/air combustion with data obtained from experiments with the same burner geometry.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Combustion Parameters on Pollutant Emissions in a Porous Burner

Khiavi

2014

International Journal of Spray and Combustion Dynamics

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This paper reports a two-dimensional numerical prediction of premixed methane/air combustion in inert porous media. The two dimensional Navier-stokes equations, the two separate energy equations for solid and gas and conservation equations for chemical species are solved using finite volume method based on SIMPLE algorithm. The burner under study is a rectangular one with two different regions. First region is a preheating zone (low porosity matrix) that followed by the actual combustion region (high porosity matrix). For simulating the chemical reactions, skeletal mechanism (26 species and 77 reactions) is used. For studying the pollutant emissions in this porous burner, the effects of porous matrix properties, excess air ratio and inlet velocity are studied. The predicted gas temperature contour and pollutant formations are in good agreement with the available experimental data. The results indicate that the downstream of the burner should be constructed from materials with high conductivity, high convective heat transfer coefficient and high porosity in order to decrease the CO and NO emissions. Also, with increasing the inlet velocity of gas mixture and the excess air ratio, the pollutant emissions are decreased.

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Numerical and experimental investigation of matrix-stabilized methane/air combustion in porous inert media

Cited by 166 publications

References 15 publications

Numerical simulation of porous radiant burners under transient condition

Numerical simulation of porous radiant burners under transient condition

Filtration Gas Combustion in a Porous Ceramic Annular Burner for Thermoelectric Power Conversion

The Effects of Combustion Parameters on Pollutant Emissions in a Porous Burner

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