Flow visualization and current distributions for a corona radical shower reactor ☆

NOx removal in a corona radical shower system depends not only on the discharging characteristics but also on the airflow pattern in the reactor. In this paper, the effects of discharging nozzle electrode configuration such as number of nozzles on the pipe electrode on the current distribution and airflow in the reactor are measured. The airflow in the reactor is visualized for the several nozzle electrode configurations by Shadowgraph method. As a result, it is found that the current density distribution depends on the nozzles configuration on the pipe electrode, and corona current density increase with increasing the applied voltage, while the location of maximum current density reaches to the underneath the tip of the nozzles as the applied voltage increases. The image obtained by Shadowgraph method shows the generation of turbulent flow around the pipe with nozzles electrode. It is found that the airflow is much different from that of the conventional discharging electrode such as the smooth wire.