Publication
Experimental and Numerical Investigation of Laminar Burning Velocities of Artificial Biogas Under Various Pressure and CO2 Concentration
Publisher:
EDP Sciences
Date:
2019
DOI:
10.1051/E3SCONF/201913001037
Abstract: As a renewable and sustainable fuel made from digestion facility, biogas is composed predominantly of methane (CH 4 ) and carbon dioxide (CO 2 ). CO 2 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 CO 2 concentration and mixture pressure on biogas combustion, the effects of CO 2 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 CO 2 concentration and mixture pressure. Therefore, the burning velocity of biogas mixtures may decrease as the amount of CO 2 in the gas increases.