Formation of ozone and NO_x during corona discharge radical shower
The formation of ozone and NO_x during corona discharge radical shower has important effect on NO oxidation and energy consumption.How the geometric structure,number and placement direction of nozzle electrode affected the formation of ozone and NO_x during corona discharge was studied.The results showed that increasing nozzle radius and number of nozzles could expand corona region and strengthen discharge intensity.Ozone concentration increased obviously with increasing nozzle radius and number of nozzles.However, overly-larger nozzle radius and too many nozzles might lead to corona shield phenomena, which decreased discharge current and ozone concentration.In this experiment 3(14) nozzle electrode was considered the best.Increasing number of nozzles only increased maximum ozone concentration.However,the energy efficiency of NO conversion in the reactor would not be improved by increasing number of nozzles because NO conversion depended on ozone formation.Ozone was produced more with vertical nozzle electrode than with horizontal nozzle electrode.NO_x concentration was lower during corona discharge with different geometry nozzle electrodes, less than 15 μl·L -1.