Analysis of the flame structure for lean methane–air combustion in porous inert media by resolving the hydroxyl radical

Stelzner, Björn; Keramiotis, Christos; Voss, S.; Founti, M.; Trimis, D.

doi:10.1016/j.proci.2014.06.151

Cited by 40 publications

(6 citation statements)

References 25 publications

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“…As a well-known fact the PMB running at lean ER have proven to be best suitable for any application [11,12]. (6) and (7) were used to verify the uncertainties, where and stands for mean value and standard deviation, while uncertainty was computed by taking percentage ratio of / .…”

Section: Experimental Studymentioning

confidence: 99%

Assessment of porous media burner for surface/submerged flame during porous media combustion

Janvekar¹,

Abdullah²,

Ahmad³

et al. 2017

AIP Conference Proceedings

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Abstract.The applications of porous media burners are of often keen interest to researchers because of many modern advantages, such as high thermal efficiency, stable flame and low emission rate. In this current experimental work, a microburner was made built to achieve both surface and submerged flame for three different thicknesses of reaction layers. A reaction layer of discrete alumina with a predefined thickness of preheat layer was used for combustion. Reaction layer was accordingly replaced with different thicknesses of 10mm, 20mm and 30mm. This work mainly aimed to show burner behavior with increase in thickness of reaction layer thus suggesting the optimum equivalence ratio from best burner performance. Interesting and unique behavior of the burner was encountered for each thickness of the reaction layer. Highest surface temperature was found out with 10mm of reaction layer, while highest wall temperature was incorporated with 20mm of reaction layer. Equivalence ratio of 0.3 is best suitable for optimum performance of the burner. Finally, thermal efficiencies were calculated for surface and submerged modes at optimum equivalence ratio. Emission parameters, such as NOx and CO were also taken into consideration.

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Section: Experimental Studymentioning

confidence: 99%

Assessment of porous media burner for surface/submerged flame during porous media combustion

Janvekar¹,

Abdullah²,

Ahmad³

et al. 2017

AIP Conference Proceedings

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“…Geometry, material properties and main features of the burner under study have been described in detail in previous studies [14,27]. It is here briefly stated that the flame trap consists of 1 mm arrayed holes along its alumina (Al 2 O 3 ) solid structure and the porous matrix serving as the combustion zone, is made of silicon infiltrated silicon carbide foam (SiSiC) with a pore size of 10 ppi.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…These advantages, the associated materials, geometries and burner developments have been overviewed in detail in the past [9][10][11], and along with thorough analytical investigations [12,13] improve nowadays the understanding of the combustion inside porous media. In this direction, nonintrusive laser diagnostics have been recently employed in order to visualize the flame structure [14] and obtain realistic temperature and species measurements inside the combustion zone [15,16], although measurements with intrusive techniques have been reported as well [17]. Nevertheless, the opacity of the porous matrix constitutes the application of optical diagnostics rather complicated hence the majority of the experimental effort has been focused in characterizing porous burners with respect to operating features.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a radiant porous burner performance with simulated natural gas, biogas and synthesis gas fuel blends

Keramiotis

Katoufa

Vourliotakis

et al. 2015

Fuel

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“…Porous matrix-stabilized combustion refers to the mixture of fuel and oxidizer burning within a solid porous inert medium. The associated technology, matrix-stabilized porous medium combustion, has been brought into focus due to its advantages, such as extended lean flammability limits, low pollutant emissions, and high flame temperature and speed [3,4]. The porous inert medium combustion can obtain a higher flame temperature than thermodynamic equilibrium adiabatic values.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the porous medium plays an important role in heat accumulation, which helps the lean mixtures stabilize the flame and makes the flammability limits lower. A great number of studies report on combustion using porous burners [3][4][5][6]. Generally speaking, SiC or Al 2 O 3 honeycomb is inserted as the porous matrix inside the porous combustion burner.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

Luo

Liu

et al. 2018

Catalysts

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Utilizing catalysts in microcombustors is probably an excellent practical solution to stabilize fuel combustion because of the relatively fast reaction speed. In the present work, the monolithic catalyst Pd/A2O3/Fe-Ni with metal foam as matrix was used inside a 5 mm in diameter microcombustor. Then the effects of inlet velocity and equivalent ratio on catalytic combustion characteristics of methane were studied experimentally. The results showed that the methane and air mixture with the stoichiometric ratio Φ = 1.0 could be ignited at v = 0.2–0.6 m/s. The velocity of premixed mixture had a great influence on the catalytic combustion of methane. The larger the inlet velocity, the higher the temperature and the brighter the flame were. The experiment results also showed that the equivalence ratio had a large essential impact on the catalytic combustion, especially for the lean mixture of methane and air. It seemed the addition of the porous matrix with catalysts could significantly extend the limits of stable combustion. In the detection of exhaust gas, CO selectivity increased and CO2 selectivity decreased with the equivalence ratio. When Φ was between 0.94 and 1.0 m/s, a little amount of hydrogen was produced due to the lack of oxygen. The measured conversion of methane to CO and CO2 was very high, usually greater than 99%, which indicated the excellent performance of the catalyst.

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Analysis of the flame structure for lean methane–air combustion in porous inert media by resolving the hydroxyl radical

Cited by 40 publications

References 25 publications

Assessment of porous media burner for surface/submerged flame during porous media combustion

Assessment of porous media burner for surface/submerged flame during porous media combustion

Experimental investigation of a radiant porous burner performance with simulated natural gas, biogas and synthesis gas fuel blends

Experimental Study on Catalytic Combustion of Methane in a Microcombustor with Metal Foam Monolithic Catalyst

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