Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Numerical Characterization of Biogas Combustion with Laminar Flame Velocity and Ignition Delay Time in Conditions Analogous to Gas Turbine Combustors.
Submission Author:
Alexandre Costa Goulart , SP , Brazil
Co-Authors:
Alexandre Costa Goulart, Loreto Pizzuti, Rafael Maia Altafim
Presenter: Alexandre Costa Goulart
doi://10.26678/ABCM.COBEM2023.COB2023-0972
Abstract
Biogas is an important near-net-zero carbon fuel alternative that can reach high calorific value if subjected to upgrading and cleaning. Therefore, its composition can vary deeply depending on the level of processing performed, especially concerning carbon dioxide content. Hydrogen gas can also be present in small amounts in raw biogas and can be added to improve the fuel’s calorific content. Numerical characterization of the combustion of different grades of biogas with air is performed for conditions similar to those found in gas turbine combustors with operational pressures and temperatures. Primarily laminar burning velocity and ignition delay times are calculated. Nitrogen oxides and carbon monoxide emissions are also analyzed in the range of equivalence ratios of lean premixed combustors. Combustion kinetics calculations are performed using Cantera and the reaction mechanisms for methane and air combustion used are “GRI-Mech 3.0” and “San Diego mechanism”. The patterns identified for combustion characteristics and emissions layout preferred operational parameters for gas turbine combustors working with varying compositions of biogas.
Keywords
methane, Biogas, Combustion, Alternative fuels, laminar flame velocity, Ignition delay time
