Characteristics of Biogas and Syngas Combustion

Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

“…The decrease in the adiabatic flame temperature with CO 2 content increase is observed from Figure 7 where data reported by Boushaky et al [99] with COSILAB code and Ren et al [41] with CHEMKIN II package for stoichiometric biogas-air mixture at 298 K and 1 bar are given. Xie et al [81] noted that the flame temperature does not decrease linearly with the increase of the CO 2 content.…”

“…According to results of Hu et al [110] on H2-air flames the decrease of laminar burning velocity with the increase of initial pressure can be understood by the suppression of overall chemical reaction due to the decrease of H and OH mole fractions in flames. Hu et al In addition to a decrease of flame temperature, a decrease in NO x emissions by increasing CO 2 content in the biogas mixtures was observed [99]. This observation can be beneficial to reduce the NO x emissions provided by the internal combustion engines by redirecting a part of the exhaust gases into the intake manifold, lowering the combustion temperature and hence decrease of NO x emissions.…”

“…Another set of papers reports laminar burning velocities obtained from simulations performed using the REGATH package [39] or COSILAB package [29,99] with GRI 3.0 chemical scheme.…”

“…Numerical calculations of biogas-air flames are performed using the 1-D COSILAB code using GRI-Mech 3.0 mechanism [99]. Calculations include laminar flame velocity, flame temperature and CO-NO x emissions with different parameters, such as temperature and pressure of fresh gases, equivalence ratio and gas composition.…”

“…Decreasing of the laminar burning velocity with increase in carbon dioxide content is also observed when examining data from numerical modeling. Figure 6 gives experimental and numerical data from Yadav et al [24] and the calculated data from Boushaki et al [99]. The decrease of the laminar burning velocity with the increase of CO2 content occurs due to three effects: the dilution effect, the thermal-diffusion effect and the chemical effect.…”