Radiant Flux Measurements in the Pilot-Scale IFRF-NFA Burner Operating in a High CO2 Environment at Different Swirl Settings

The thermal environment produced by the IFRF Near Field Aerodynamics burner under O2/CO2 combustion and different swirl settings (0-90%) was examined. A comparison case involving air combustion under a single swirl setting of 70% was also included. As the swirl setting was increased from 0 to 70% under O2/CO2 combustion, furnace temperatures and radiant heat flux to the wall increased by 5% and 20-25%, respectively. For the same swirl setting of 70%, air combustion resulted in up to 15% higher temperatures and 20-24% higher levels of radiant heat flux than O2/CO2 combustion. This implies that a higher O2 to CO2 ratio is needed in order to obtain levels of heat flux and temperature similar to those experienced in air combustion.