介质阻挡放电反应器中的二硫化碳降解特性

为了解CS₂(二硫化碳)在介质阻挡放电反应器中的降解特性,提高其去除率,设计并制作了同轴圆柱介质阻挡放电反应器,研究了介质层数、外施电压、中心电极材料及直径、背景气氛种类和RH(相对湿度)对CS₂去除率的影响. 结果表明:在外施电压(4.0～6.5kV)较低时,单介质反应器的CS₂去除率高于双介质反应器；而在外施电压(6.5～9.0kV)较高时,双介质反应器对CS₂的去除效果更好,增大外施电压有利于CS₂的降解. 铜丝比不锈钢丝更适合用作反应器的中心电极,此外,增加中心电极的直径也可提高CS₂去除率. 当中心电极直径从 3.2mm增至4.8mm时,CS₂平均去除率由63%增至75%,但平均质量能耗由510kJ/mg增至611kJ/mg. 同等条件下,CS₂在氧气中的平均去除率(74%)最大,空气(59%)中次之,氮气(48%)中最小；背景气氛中适量的RH(26%)有助于提高CS₂去除率,但RH太大(大于50%)反而会降低CS₂去除率. 

Degradation Characteristics of Carbon Disulfide in the Dielectric Barrier Discharge Reactor

In order to reveal the degradation characteristics of CS_2in dielectric barrier discharge (DBD) reactors and improve its removal rate, coaxial cylinder-tube DBD reactors were designed to study the effect of several factors on removal rate of CS_2in DBD plasma. The factors include the number of dielectric layer, applied voltage, material and diameter of center electrode, type and relative humidity of background atmosphere. The experimental results showed that the removal rate of CS_2in the singer-dielectric-layer reactor was higher than that in the double-dielectric-layer reactor when the applied voltage was low (4.0-6.5kV). However, there was a higher removal rate of CS_2in the double-dielectric-layer reactor, when the applied voltage was higher (6.5-9.0kV). Higher applied voltage was helpful for the removal of CS₂. As a center electrode of the reactor, brass wire was superior to the stainless steel wire. The removal rate of CS₂can be improved from 63% to 75% by increasing the diameter of the center electrode, while the average energy consumption increased from 510kJ/mg to 611kJ/mg. Under the same conditions, the average removal rate of CS₂was the greatest in oxygen (74%), the second in the air (59%) and the smallest in nitrogen (48%). Appropriate relative humidity (26%) in the background atmosphere contributed to the improvement of the removal rate of CS₂, however, the high relative humidity (more than 50%) reduced the removal rate of CS₂.