Combustion characteristics of various biogas flames under reduced oxygen concentration conditions

Şahin, Murat

doi:10.1080/15567036.2019.1601796

Cited by 10 publications

(4 citation statements)

References 27 publications

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“…This is because the energy density produced by the Micro Power Generator is greater than the energy density of the Lithium Ion Battery which is widely used today [15], [16]. Furthermore, converting fuels into thermal power in an MSC combustion chamber to get high efficiency of MPG [17] using the thermos-photovoltaic method. However, to improve combustion stability in an MSC, sudden expansion was carried out in the combustor channel [18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Biogas as an Alternative Fuel in Micro-Scale Combustion Technology

Sanata,

Sholahuddin,

Rosyadi

et al. 2023

IJIE

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This study observes the flame characteristics of the biogas in micro/meso-scale (MSC) combustion technology, namely in a cylindrical MSC. For comparison, the fuel and combustor variations were carried out with backward-facing step size (bfs) as the flame holder in the combustor.The bfs are varied by changing the combustor's length of the inlet diameter. However, the size of the outlet diameter of the combustor is always constant to obtain a continuous combustion reaction zone. Biogas/methane (CH4), butane gas (C4H10), and a mixture of biogas-butane are used as fuel, with air as the oxidizing agent. The results showed that the type of fuel, reactant flow velocity, and equivalent ratio that occurred in the fuel variation and the bfs variation of the cylindrical msc influenced the flame characterization. Stable flame forms in the stoichiometric to rich equivalent ratio area and the medium to high reactant velocity area. The result shows that the equivalent ratio (φ) is 1.23 –1.44, the flame stability limit at the combustor ratio of 0.7, and biogas fuel has low flame stability compared to butane and the biogas-butane mixture. Moreover, the flame can be stable on butane fuel in the equivalent ratio (φ) 0.85 –1.43 and (φ) 0.86 –1.19 for the biogas-butane fuel mixture. Furthermore, when the D1/D2 increases, the flame stability of biogas tends to be wider than when the combustor ratio is 0.7, where the equivalent ratio (φ) is 0.98 –1.42. The result also shows that the flame can be stable on butane fuel in the equivalent ratio (φ) 0.71 –1.43, and for the biogas-butane fuel mixture, the flame can be stable in the equivalent ratio (φ) 0.69 –1.32. However, the best characterization of biogas combustion is formed in the variation of biogas treatment by mixing butane gas (biogas-butane). One of the methods used is called with a wider flame stability limit area. More varied flame visualization variations with a more widely distributed flame mode map, flame, and combustor wall temperature. The result shows that the combustor wall temperature of butane is around 225-250 °C, higher than the characterization of biogas combustion around 150°C, where it's without mixing butane gas for the possible test ranges.

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Section: Introductionmentioning

confidence: 99%

Characterization of Biogas as an Alternative Fuel in Micro-Scale Combustion Technology

Sanata,

Sholahuddin,

Rosyadi

et al. 2023

IJIE

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“…According to the above-mentioned literature, these properties are highly dependent on the burner configuration and fuel type chosen. Swirling flames implemented in the burner configurations 15,16 via bluff body or swirler effect directly on stability and emissions S ¸ahin 17 investigated the thermal field distributions and pollutant emission in the combustion of six biogases of various compositions in a natural gas burner under distributed combustion conditions. The outcome was in good agreement with the experimental findings.…”

Section: Introductionmentioning

confidence: 99%

Mathematical investigation of syngas fired burner with various configurations in the BERL combustor

Medhat

Khalil

Haridy

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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This paper discusses the effect of burning syngas in a configuration similar to that of the BERL (Burner Engineering Research Laboratory) 300 KW swirl-stabilized combustor which has previously been used with methane as a fuel. Due to the axisymmetric configuration, only 15° from the burner angle is studied with periodic boundary. The model adopts RANS (Reynolds Averaged Navier–Stokes) technique including a realizable k-ε turbulent scheme. The non-premixed combustion model used is based on applying flamelet concept. The study shows that the structure of the flame is affected with changing the burner quarl angle and the inlet air swirl number. The detailed parametric study of this synthetic fuel in the BERL paradigm relates easily to the accumulated experimental and numerical studies available in this configuration and then acquiring add noval value to the present work. The study also shows the presence of different recirculation zones, one of which is central recirculation zone and an external recirculation zone. When increasing quarl angle, the central recirculation zone is shifted outward and the turbulent interaction between the central fuel jet and the recirculation zone induces small vortices between these two flow patterns. On the other hand, the effect of flue gas recirculation and air staging into the burner on the reduction of NOx formation is discussed. The flue gas data show that FGR reduces NOx emissions significantly while having no influence on flame stability, total combustion efficiency, or CO emissions. Changes in fuel composition are also taken into account. The results reveal that when the hydrogen blending in the fuel increases, the temperature rises.

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“…Results showed that adding hydrogen to the mixture increased significantly the lift-off height. (Sahin 2019) conducted a numerical study regarding biogas flame under the MILD regime. The influence of many operative conditions such as oxygen concentration in oxidizer stream and fuel composition has been undertaken.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Biogas-Syngas Turbulent MILD ‎Combustion in the Jet in Hot Co-Flow Burner

2021

JAFM

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Moderate or Intense Low-oxygen Diluted (MILD) combustion is a promising technology with interesting properties such as high efficiency and zero-emission. The biogas-syngas mixture is also considered a promising new renewable biofuel with low emissions. This work aims to examine the effects of several parameters on the biogas-syngas flame structure and emissions under MILD conditions in the Jet in Hot Co flow (JHC) burner. The turbulence is modeled by the modified standard k-ε model; whereas combustion-turbulence interaction is handled by the Eddy Dissipation Concept (EDC) in conjunction with three detailed reaction mechanisms, namely: GRI-Mech 3.0, GRI-Mech 2.11, and DRM 2.11. Effects of biogas-syngas composition, temperature, and oxygen concentration in the hot co-flow and Reynolds number of the fuel jet have been elucidated. Results show that flame structure is more sensitive to the increase of hydrogen in syngas than that of methane in biogas. An increase of oxygen concentration or temperature in the co-flow stream leads to more NO formation whereas Reynolds number augmentation reduced them. Furthermore, NO species production is globally governed by the NNH route.

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Combustion characteristics of various biogas flames under reduced oxygen concentration conditions

Cited by 10 publications

References 27 publications

Characterization of Biogas as an Alternative Fuel in Micro-Scale Combustion Technology

Characterization of Biogas as an Alternative Fuel in Micro-Scale Combustion Technology

Mathematical investigation of syngas fired burner with various configurations in the BERL combustor

Characterization of Biogas-Syngas Turbulent MILD ‎Combustion in the Jet in Hot Co-Flow Burner

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