Investigation of the multicomponent syngas composition and CO2/N2 dilution on the adiabatic flame velocity and overall activation energy

Abstract

Biomass gasification can result in different syngas compositions with distinct laminar flame velocities. These velocity variations must be evaluated and measured to allow the design of appropriate combustion systems. Thus, the objective of this work is to evaluate the effect of the multicomponent syngas composition and the CO2/N2 dilution on the adiabatic flame velocity and overall activation energy. The experimental results are compared with values obtained through chemical kinetics mechanisms San Diego (2016), HP-Mech (2017), FFCM-1 (2016) and Goswami (2014). It is observed that reducing the H2/CO ratio from 1.00 to 0.43 results in a 16 % reduction in the adiabatic flame velocity, while the activation energy increases by 21 %. A correlation for adiabatic flame velocity as a function of dilution mass fraction is also developed. The chemical kinetics analysis allowed the evaluation of the main reactions responsible for the increase in flame velocity due to the addition of H2.