Multi-parameter Effects On Ozone Generation In DBD With Magnetic Field

Due to the strong oxidizing property and environmentally friendly,ozone has been widely used in many fields.Dielectric barrier discharge is the most common methods for ozone production in industry.Although in recent years,many scholars have improved ozone production efficiency in many ways,ozone production efficiency for commercial ozone generator is still low,which is far from the theoretical value.In the process of ozone production by DBD,the density of plasma is determined by plasma frequency collision and chemical reaction.The enhancement of ionization process by magnetic field may be an effective way to improve the efficiency of ozone production.The effect of external magnetic field on the discharge characteristics has been fully studied.However,there are few reports about the influence of important parameters on the ozone production by DBD with magnetic field.By making a magnetic field enhanced needle-plate DBD ozone generator and a magnetic field enhanced parallel DBD ozone generator in this paper,the effects of discharge voltage,discharge frequency and airflow rates on the discharge characteristic and ozone generation of DBD in magnetic field environment were systematically investigated.The main conclusions are as follows:Whether for needle plate DBD or parallel DBD,the addition of magnetic field does not evidently change corona inception voltage,but it can significantly improve the discharge current.Meanwhile,the discharge power of the needle plate DBD can be increase about 23.9%at 8.0 kV and 5.0 kHz with magnetic field,and the discharge power of the parallel DBD can be increased about 27.2%at 7.5 kV and 5.0 kHz with magnetic field.The dielectric layer equivalent capacitance increases because of the existence of magnetic field and increases with the increasing of discharge voltage.The change trend of ozone concentration and ozone yield with and without magnetic field is similar.The ozone concentration of the needle plate DBD with magnetic field has a significant increase,and with the increase of discharge voltage,discharge frequency and SIE,the enhancement effect will be more obvious.An approximately maximal 35.4%higher ozone concentration can be obtained at 8.0 kV and 5.0 kHz.Meanwhile,application of the higher airflow rate through the air inlet increases ozone yield for the discharge.For the parallel DBD with and without magnetic field,the ozone concentration and yield increase with the increase of discharge voltage and SIE,and the effect of high discharge voltage and SIE is more obvious.An approximately maximal 35.5%higher ozone concentration can be obtained at 7.5 kV and 5.0 kHz.However,the magnetic field does not substantially increase ozone yield for both needle plate DBD or parallel DBD.