Chemical and Physical Effects of Carbon Dioxide Injection with Different Preheating Temperature in Flameless Combustion

The purpose of the present study is numerical simulation of flameless burner with carbon dioxide injection into the oxidizer stream using open-source openFoam software. Also, the effect of different amounts of oxidizer preheating temperature has been studied. In order to perform simulations from the PaSR combustion model, the standard k-ε turbulence model with modified coefficients and discrete phase radiation model with calculation of adsorption and emission coefficients using WSGGM model with non-gray gas coefficients have been used. The results of the present study indicate that the physical effects of carbon dioxide degradation will reduce the amount of heat release and the amount of carbon monoxide produced, while the chemical effects of this injection result in a significant increase in these amounts. Increasing the mass fraction of injection from 0.25 to 0.75 leads to a change in the maximum mass fraction of carbon monoxide produced from 0.05 to 0.072. Also, the chemical effect of the injection changes the flame structure and increased carbon monoxide emissions by increasing the preheating temperature. The chemical effect of CO2 injection on the production of NOx pollutants is such that, with increasing temperature, the amount of NOx emission is increased.