Gas-liquid Two Phase DBD Discharge Characteristic Research Under Atmospheric Pressure

Non-thermal plasma technology has been widely used in the field of purifying waste water from hydroelectric power plant and waste gas which emissions from thermal power plant.GasLiquid two phase dielectric barrier discharge can achieve a large area auxiliary uniform and stable discharge when it auxiliary to a screen,and the liquid solution can promote the formation of O and OH-radicals,it is very well to meet the basic needs of industry application with this advantages.The researches now mainly focused on waste treatment applications in an open environment,and also focused on the electrical characteristics of discharge.However,few analysis for spectrum,and the impact of the screen mesh size and the influence of atmospheric relative humidity.In this paper,for the purpose of exhaust gas treatment,studied the effects of external factors on gas-liquid two-phase dielectric barrier discharge plasma source structure in a closed atmosphere circumstance.In this paper,studied the gas-liquid two phase DBD under the closed atmosphere circumstance,first of all,calculate the discharge power by the voltage-current detection method,gain the effects of external factors,such as screen mesh size,relative humidity,power driver frequency and the gas flow rate on discharge power,at the same time,analyzes the development process of discharge through recording the discharge view and the influence of discharge gap on the discharge current.And at their respective peak frequency,compares difference of electrical properties between gas-liquid two-phase structure and conventional plate-plate electrode structure;The study results show that the size of the screen mesh have a major impact on generating of the discharge channel and its distribution,the maximum discharge power gained when relative humidity of air is 85%.Compare gas-liquid two phase dielectric barrier discharge with conventional plate-plate electrode structure,discharge power of the former reaches a maximum at 11 kHz,and the latter reaches a maximum value at 12 kHz.Under each peak frequency,the gas-liquid two-phase dielectric barrier discharge discharge power was significantly higher than conventional plate-plate electrode structureSecondly,calculates electron excitation temperature and molecular vibrational temperature by Boltzmann curve fitting combine with the emission spectra,obtain the effect mechanism of relative humidity,gas flow rate and the drive frequency on the optical parameters.The optical properties results showed that the o applied voltage,power frequency and gas flow rates have a great influence on the electron excitation temperature and molecular vibrational temperature.It was found that electronic excitation temperature and molecular vibrational temperature increase with the increase of power frequency first,and reaches a maximum at 11 kHz,then showed a decline after the macimum value;excitation temperature increases with the increase of gas flow at first and then has trend of downward.Under each peak frequency,the electron excitation temperature value of gas-liquid twophase dielectric barrier discharge significantly higher than conventional plate-plate electrode structureThe study of this paper has some theoretical significance and application value in promoting the application of atmospheric pressure dielectric barrier discharge.