Combustion of fuels under enhanced oxygen atmospheres has been well investigated over the past decades in
various types of combustors, varying from diesel engines to coal-fired boilers. Most studies have found
significantly lower NOx emissions during Oxy-coal combustion. In this paper, NOx combustion chemistry
under O2/CO2 atmosphere as well as air atmosphere was studied using detailed kinetic model. A suitable
reaction mechanism was chosen based on the comparison between the calculation result and the
experimental data. The influence of various parameters (temperature, CO2 concentration) on NOx conversion
was investigated. The chemical effects of high CO2 concentration on NO formation and destruction process
was studied. On the basis of investigations through elementary chemical reactions, it can be concluded that
high CO2 concentration play a pronounced role on NOx conversion process. Moreover, the dominant reaction
steps contribution to production and destruction of NO as well as the most important reactions for NO
reduction under different atmospheres were discussed.