Experimental and numerical study of CO2 content effects on the laminar burning velocity of biogas

Nonaka, Hidehiko; Pereira, Fernando M.

doi:10.1016/j.fuel.2016.05.098

Cited by 81 publications

(50 citation statements)

References 40 publications

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“…Besides, CO 2 is one of the major products of combustion. It has been reported the chemical kinetics of fuel/air mixture modifications, invoked by the addition of 1CO 2 , can be associated with the following major reactions:

CO + OH = {CO}_{2} + normalH,

normalH + O_{2} = normalO + OH .

…”

Section: Resultsmentioning

confidence: 99%

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

et al. 2019

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Summary In this study, combustion characteristics of various biogas/air mixtures with hydrogen addition at elevated temperatures were experimentally investigated using bunsen burner method. Methane, CH4, was diluted with different concentrations of carbon dioxide, CO2, 30 to 40% by volume, to prepare the biogas for testing. It is followed by the hydrogen, H2, enrichment within the range of 0 to 40% by volume and the temperature elevation of unburned gas till 440 K. Blowoff velocities were measured by lowering the jet velocity until a premixed flame could be stabilized at the nozzle exit, while laminar burning velocities were calculated by analyzing the shape of the directly captured premixed bunsen flames. The results showed that hydrogen had a positive effect on the blowoff velocity for all three fuel samples. Nonlinear growth of the blowoff velocity with hydrogen addition was associated to the dominance of methane‐inhibited hydrogen combustion process. It was also observed that the increase in the initial temperature of the unburned mixture led to a linear increase of the blowoff velocity. Moreover, specific changes in flame structure such as flame height, standoff distance, and the existence of tip opening were attributed to the change in the blowoff velocity. The effect of CO2 content in the mixture was examined with regards to laminar burning velocity for all compositions. The outcome of the experiment showed that the biogas mixture with higher content of CO2 possessed lower values of laminar burning velocity over the wide range of equivalence ratios. A reduced GRI‐Mech 3.0 was used to simulate the combustion of biogas/air mixtures with different compositions using ANSYS Fluent. The numerically simulated stable conical flames were compared with the experimental flames, in terms of flame structure, showing that the reduced GRI‐Mech 3.0 was suitable for modeling the combustion of biogas/air mixtures.

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CO + OH = {CO}_{2} + normalH,

normalH + O_{2} = normalO + OH .

…”

Section: Resultsmentioning

confidence: 99%

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

et al. 2019

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“…As a fuel derived from biodegradable waste, biogas is a renewable energy resource. Biogas is produced from decomposing biomass using bacterial in anaerobic environment [8][9][10]. The composition of biogas depends on the production procedure and biomass feedstock.…”

Section: Introductionmentioning

confidence: 99%

“…There has been a series of studies on the effects of CO2 and initial mixtures pressure on laminar burning velocity of CH4 [18][19][20][21][22][23]. Some studies suggested that as the percentage of CO2 in fuel mixture increases, biogas laminar burning velocity decreased [10,[19][20][21][22]. Some studies have suggested that compared to other diluents such as N2 (Nitrogen) and H2 (Hydrogen), CO2 has much more significant effect in reducing laminar burning velocity of CH4 [18,19].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Laminar Burning Velocities of Artificial Biogas Under Various Pressure and CO₂ Concentration

et al. 2019

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As a renewable and sustainable fuel made from digestion facility, biogas is composed predominantly of methane (CH4) and carbon dioxide (CO2). CO2 in biogas strongly affects its combustion characteristics. In order to develop efficient combustors for biogas, fundamental flame characteristics of biogas require extensive investigation. In understanding the influence of CO2 concentration and mixture pressure on biogas combustion, the effects of CO2 concentration on the laminar burning velocity of methane/air mixtures were studied at different pressures. The studies were conducted using both numerical and experimental methods. The experiment was conducted using a constant volume high pressure combustion chamber. The propagating flames were recorded with a high speed digital camera by employing Schlieren photography technique. The numerical simulation was carried by utilizing CHEMKIN-PRO with GRI-Mech 3.0 employed as the chemical kinetics model. The results show that the laminar burning velocity of methane-air mixtures decreased with an increase in CO2 concentration and mixture pressure. Therefore, the burning velocity of biogas mixtures may decrease as the amount of CO2 in the gas increases.

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“…The clean biogas (CH4 and CO2) is a fuel whose combustion properties such as calorific value, flame temperature and deflagration velocity are poor compared to conventional gaseous fuels such as natural gas or LPG [8]- [11], producing that the use of the biogas in combustion systems requires modifications in the design of the burners that avoid the problems of flame instability associated to the lower flame speed and the change in the limits of flammability [12]- [14]. One of the ways to improve these combustion properties in to convert biogas to biomethane using different treatments that reduce the CO2 content and its effects [15], [16] as well as other minor compounds such as H2S [7], [17], [18]. However, this treatment process is expensive in terms of equipment and absorbing substances such as amines.…”

Section: Introductionmentioning

confidence: 99%

Efecto de la adición de hidrógeno en la velocidad de deflagración del biogás. Estudio numérico y experimental.

González

Caballero²,

Sandoval³

2019

Sci. tech

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En este trabajo, se ha medido la velocidad de llama laminar de las mezclas de combustible biogás/H2, desde biogás puro hasta mezclas de este con una adición de 15% de H2 en volumen, utilizando el método del cono interno de la zona de combustión o método bunsen. La velocidad de la llama laminar se determina por medio de los parámetros geométricos del cono de combustión capturando imágenes de las llamas. Los factores de aireación abarcan desde condiciones estequiométricas hasta condiciones de mezcla pobre. Los resultados experimentales se han comparado con los resultados numéricos obtenidos con el software CHEMKIN, utilizando el mecanismo cinético de GRIMECH, con una buena concordancia entre ellos y con trabajos previos, mostrando la confiabilidad del método utilizado. Las tendencias en los resultados experimentales de la velocidad de la llama laminar se explican por medio de resultados numéricos sobre el perfil de temperatura y la tasa de liberación de calor. La adición de hidrógeno en las llamas de biogás muestra un efecto importante, especialmente en zonas cercanas a las llamas estequiométricas, disminuyendo sus efectos en la combustión de mezclas pobres.

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Experimental and numerical study of CO2 content effects on the laminar burning velocity of biogas

Cited by 81 publications

References 40 publications

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

Experimental and Numerical Investigation of Laminar Burning Velocities of Artificial Biogas Under Various Pressure and CO₂ Concentration

Efecto de la adición de hidrógeno en la velocidad de deflagración del biogás. Estudio numérico y experimental.

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Experimental and numerical study of CO2 content effects on the laminar burning velocity of biogas

Cited by 81 publications

References 40 publications

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

Enhancement of biogas/air combustion by hydrogen addition at elevated temperatures

Experimental and Numerical Investigation of Laminar Burning Velocities of Artificial Biogas Under Various Pressure and CO2 Concentration

Efecto de la adición de hidrógeno en la velocidad de deflagración del biogás. Estudio numérico y experimental.

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Experimental and Numerical Investigation of Laminar Burning Velocities of Artificial Biogas Under Various Pressure and CO₂ Concentration