Abstract
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.
Highlights
Biogas is a renewable fuel which is made from digestion facility and is predominantly composed of methane (CH4) and carbon dioxide (CO2)
The increase of carbon dioxide concentration in atmosphere is contributed from anthropogenic activity such as utilization of fossil fuel [1]
From the results of this study, it is found that CO2 concentration and initial mixture pressure are affecting the laminar burning velocity of CH4/CO2/Air mixtures at various CO2 concentration and initial pressure
Summary
Biogas is a renewable fuel which is made from digestion facility and is predominantly composed of methane (CH4) and carbon dioxide (CO2). The CO2 constituent in biogas significantly affects the combustion characteristics of the fuel. To develop a combustor with efficient use of biogas, optimized power usage, and emissions control, basic flame characteristics of biogas inside the IC engines need to be investigated further. The increase of carbon dioxide concentration in atmosphere is contributed from anthropogenic activity such as utilization of fossil fuel [1]. Carbon dioxide emission in large number is the primary source of global warming [4]. In order to find solution to this problem, many researchers have been interested in the study of alternative energy sources to replace fossil fuel [5,6,7]
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