Study On Removal Of Nitrogen Oxides With Corona Discharge Atomization Device

In recent years, NO_xemissions still keep in higher level, and acid rain problem becomemore and more serious, so, nitrogen oxides also cause enough attention.Many scholars in theresearch and development put their hands on developing the related effective denitrificationequipment and methods.This experiment combined the wet-denitrification and plasma, usingcavity-type corona atomization devices on denitration solution in order to study thedischarging features. Then the cavity corona atomization denitrification device is made toremove nitrogen oxides with alkaline solution, and a good removal efficiency is obtained. Wesummarize influence factors.about the nitrogen oxide removal efficiency. The results showthat:1. In the processing of corona discharge atomization, the discharging voltage, solutioncharacteristics and experimental conditions will impact the solution discharge properties.Along with the increasing of voltage, the space has more charge quantity and atomizationeffect is better than low voltage. The bigger solution viscosity,the larger size of droplet jettingon the the surface of cavity. And this size of droplet will not easy to broken.The riseing ofindoor temperature can increase the evaporation capacity of droplet and molecular motion. Sothe effective charge on broken-role will be reduced.2.The denitrification efficiency in using NaOH solution is better than the pure wetdenitrification with manual pressure increasing. The high level of voltage will bring a goodatomization effect, then make the mass transfer rate and nitrogen oxide removal rate increases.The droplet of0.2mol/L can satisfy the removal efficiency on low concentrations of nitrogen.The bigger initial concentration of nitrogen oxides, the higher mass transfer coefficients in thegas-liquid interface. And then it will increase the nitrogen oxide removal efficiency.3. Cavity type of corona atomization device have better removal efficiency on disposingthe high concentration of nitrogen oxide, for example,90%of the removal efficiency areobtained on the pressure of30kV after5minutes’ discharging. Even for low nitrogen oxideconcentration, it also have a certain removal rate. When the inlet concentration of nitrogen oxide is82PPM, the removal rate can reach to46%on the pressure of15kV after10minutes’ discharging.