Effect of heat loss on the syngas production by fuel-rich combustion in a divergent two-layer burner

Abstract

The effect of heat loss on the syngas production from partial combustion of fuel-rich in a divergent two-layer burner is numerically studied using two-dimensional model with detailed kinetics GRI-Mech 1.2. Both the radiation and wall heat losses to the surrounding are considered in the computations. It is shown that two types heat losses have different effects on the syngas production. The radiation heat loss has significant effect on the syngas temperature and the syngas temperature is dropped as radiation heat loss is increased, but it has neglected effect on the reforming efficiency and methane conversion efficiency. The wall heat loss has a comprehensive effect on the syngas production. The wall heat loss not only reduces the conversion efficiency, but also significantly decreases the syngas temperature. The effect of wall heat loss becomes weak as the equivalence is increased. The reforming efficiency drops from 0.440 to 0.424 for equivalence ratio of 2 and mixture velocity of 0.17 m/s for the predictions between adiabatic wall and non-adiabatic conditions. • Heat loss on syngas production in divergent porous burner is conducted with detailed kinetics. • Radiant heat loss to the surrounding significantly reduces the syngas temperature. • Radiant heat loss has little effect on the methane conversion efficiency and reforming efficiency. • Wall heat loss has a comprehensive effect on the reforming efficiency and syngas temperature. • Effect of wall heat loss on the syngas production becomes strong with the equivalence ratio.