Formation kinetics of sulfur-bearing compounds in combustion of hydrocarbon fuels in air

Using an extended kinetic model, formation kinetics of compounds of SO$_x$ and HSO$_y$ groups is analyzed in the case of combustion of hydrocarbon sulfur-bearing fuels mixed with air. It is shown that formation mechanisms of S-bearing compounds significantly depend on the air-to-fuel ratio and are closely related to formation kinetics of NO, NO$_2$, CO, CO$_2$, H, OH, and HO$_2$. Both in rich and lean mixtures, there is a rather large period of time after ignition with significantly nonequilibrium variation of concentrations of N- and S-bearing components.