Numerical investigation of the distribution of oxygen atoms in syngas combustion products

The distribution of air oxygen atoms in the oxidation products of rich mixtures of syngas with air in the flame and the under autoignition conditions at constant volume was investigated by numerical simulation using the tracer method. It was found that in rich mixtures, the oxidation of hydrogen and carbon oxide occurs in stages, which is clearly visible in the profiles of the rates of formation of H$_2$O and CO$_2$. The observed stagewise nature inevitably results in the heat release rate occurring in stages. The conversion pathways and the role of the oxygen atom of the CO molecule in the heat release in these flames were investigated.