Influence Of Dielectric Barrier Discharge Reactor Structure On Discharge Characteristics And Toluene Degradation Effect

Volatile Organic Compounds(VOCs)come from a wide range of sources,involve many industries,and cause great harm to the environment and human health.Dielectric barrier discharge has great development prospects in the treatment of VOCs-containing waste gas due to its high removal rate and simple equipment,and has received extensive attention.Among them,the discharge characteristics of the reactor play a key role in the degradation of VOCs,and the discharge characteristics are greatly affected by the structure of the reactor.However,the current research on the structure of the reactor is mostly focused on its effect on the degradation of VOCs,and the research on the discharge characteristics of the reactor is less.Therefore,this paper has carried out a systematic study on this,and the main conclusions are as follows:(1)In order to study the influence of the high-voltage electrode structure of the dielectric barrier discharge reactor on the discharge characteristics and toluene degradation effect,a high-voltage electrode reactor with 6 kinds of high-voltage electrodes with different lengths,3 kinds of high-voltage electrodes with different structures and 3 kinds of coils with different pitch coils was designed.The results show that: under the same voltage,for high-voltage electrodes of different lengths,when the length of the high-voltage electrode is 10 cm,the discharge intensity of the reactor is the strongest.6.27%～34.58%;when the high-voltage electrode is a coil,the discharge intensity of the reactor is the strongest,and the discharge power of the reactor and the gas temperature in the discharge gap are the lowest,which are 0.4～10.3 W and28～64 ℃,respectively.The removal of toluene For high voltage electrodes with different pitch coils,under the same voltage,when the high voltage electrode is a 10 mm pitch coil,the removal rate,mineralization rate and energy efficiency of the reactor were the highest,which were 25.3%～100%,3.41%～35.96%,and 23.17～4.96 g/k Wh,respectively.(2)In order to study the influence of the grounded electrode structure of the dielectric barrier discharge reactor on the discharge characteristics and the degradation effect of toluene,three grounded electrode reactors with different geometrical structures and lengths were designed.The experimental study found that when the copper strip is the ground electrode,the discharge intensity is the strongest,and the removal rate of toluene,the mineralization rate and the energy efficiency are the highest,which are25.3%～100%,3.41%～35.96%,and 4.96～23.17 g/k Wh,respectively;When its length is15 cm,the removal rate and mineralization rate of p-toluene in the reactor are the highest,which are 74.9%～100% and 11.79%～46.11%,respectively.(3)In order to study the influence of the dielectric size of the dielectric barrier discharge reactor on the discharge characteristics and the degradation effect of toluene,three reactors with different inner diameters and wall thicknesses were designed.The experimental study found that when the inner diameter of the dielectric was 8 mm,the discharge power and the gas temperature in the discharge gap of the reactor were the lowest,which were 1.3～4.7 W and 45～58 °C,respectively,and the removal rate,mineralization rate,and energy efficiency of toluene were the highest,respectively.are81.5%～100%,14.87%～32.47%,25.3～8.6g/k Wh;when the wall thickness of the dielectric is 1mm,the removal rate and mineralization rate of toluene in the reactor are the highest,which are 67.7%～100%,8.62%～51.34%.