Application of reduced mechanism by DRGEP-CSP approach to the numerical simulation of biogas diluted with the H2-CO2 couple

Abstract

A numerical simulation was used to investigate an approach of reduction of the chemical kinetics coupled with two methods: Computational Singular Perturbation (CSP) and Directed Relation Graph with Propagation Error (DRGEP), in order to simulate the laminar premixed Biogas diluted by the H2-CO2. In this reduction approach, DRGEP allowed the identification of important species, elementary reactions involving unimportant species were eliminated from the detailed mechanism. To have a skeletal mechanism containing a minimum number of elementary reactions, the CSP method was used. The skeletal mechanism reduced by the DRGEP-CSP approach was opted for the simulation of biogas diluted by the H2-CO2 couple, given its high fidelity with the detailed mechanism. This reduction approach was applied to the laminar premixed flame biogas with the effect of varying the proportion of H2 and CO2. It emerges from the results that this reduction approach has a wide field of application in the study of the numerical combustion of biogas. It also appears that, the dilution of the biogas by H2-CO2 couple has a significant influence on the laminar flame speed and temperature over a wide range of aeration factors.