Characterization of High Frequency AC Corona Plasma for Degradation of Agricultural Land Film
The use of mulch has brought great convenience to agricultural development,but at the same time,it can cause extreme-ly serious white pollution,and there is a lack of relevant degradation treatment research.Low-temperature plasma degradation is a high-ly efficient and green treatment technology that degrades pollutants by generating high-energy electrons and active substances in the re-action space.Firstly,a high frequency alternating current needle plate corona discharge structure was used to optimize the design for the electrode structure.Then,the plastic film was treated by corona plasma degradation technology,and finally the effects of different discharge power,air humidity,needle film spacing and discharge spacing on the degradation of plastic film were compared.Then,the plastic film was treated by corona plasma degradation technology,and finally the effects of different discharge power,air humidity,nee-dle film spacing and discharge spacing on the degradation of plastic film were compared.The results show that the shape and distance of the needle tip will affect the electron density and electric field intensity to different degrees,and when the slope of the needle tip is 3.33 and the spacing between the needles is 12 mm,the electron density and electric field intensity are the largest,which are 1.55 x 1013 m-3 and 1.2 x 106 V/m,respectively.The increase of the discharge power will lead to the increase of the energy density in the space,thus increasing the energetic particles in the space When the input power is 64 W,the degradation efficiency is up to 0.96％,but the energy efficiency will increase first and then decrease with the increase of input power.When the input power is 56 W,the op-timal energy efficiency is 34.29 μg/(W·h).The increase of the air humidity not only leads to the change of the discharge form and the appearance of stable micro-discharge,but also affects the content of the active material,leading to the degradation of the film.The dis-tance between the ground film and the tip of the needle will also lead to stable micro-discharge,which will increase the degradation effi-ciency from 0.43％to 1.02％.In addition,the distance between the electrodes of the needle plate will also have an impact on the degra-dation efficiency,when the distance between the discharge is 15 mm can meet both the radiation range and radiation intensity of the plas-ma,the degradation efficiency and energy efficiency will reach the maximum,which are 2.3％and 68.18 μg/(W·h),respectively.
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