高频低温等离子体法去除甲苯的实验研究

Destruction of Toluene Gas Based on High Frequency Dielectric Barrier Discharge

作为挥发性有机物中重要的一种气体,甲苯的大量排放已经影响了空气质量和人类生活环境。为了扩大工业应用范围同时提高去除效率,在高频电源下采用电晕放电与介质阻挡放电相结合的方法,探讨了电压、频率、反应器材质和内电极直径等因素变化对甲苯废气降解效率的影响。实验结果表明,施加高电压有利于甲苯气体的降解,当频率为6kHz、电压为15.4kV时甲苯的降解效率可达96.25%。选取了普通陶瓷、99陶瓷和有机玻璃3种不同介电常数的介质作对比实验,在低电压条件下,3种介质对甲苯去除率的影响很小;而在高电压条件下,99陶瓷对甲苯的降解效果最好,普通陶瓷次之,有机玻璃最差。实验中还针对1.00、1.65和2.00mm3种不同直径的内电极作了对比实验,研究结果表明,粗电极对于污染物的去除效果优于细电极,但粗电极的这一优势需通过提高电压的方式来实现。

Being emitted into the atmosphere, toluene as one of the important volatile organic compounds would impact the air quality and degrading our living environment As a result, emission of toluene has caused much public concern from the view point of protection of human health and environment. With a view to broader the industrial application improving of removal efficiency remains a primary work. Basing on the combination of corona plasma and dielectric barrier discharge in the high frequency power output, this paper discussed the influence on the toluene gas removal efficiency experimentally, which was affected by applied voltage, frequency, materials of reactor, as well as the diameter of electrode. Experimental results show that the removal rate will be increased by applying high voltage. The removal efficiency of toluene gas will reach as high as 96.25% when frequency is 6 kHz and the voltage is 15.4 kV. In addition, three kinds Of materials which having different dielectric constants, ie. the common ceramics, 99% ceramics and acrylics were discussed. The experimental data show that material differences have little impact on the removal efficiency under low voltage condition. While under high voltage condition, the removal efficiency rate of the 99% ceramics is the highest, followed by the common ceramics, and the acrylies is the third. This paper also did research on the removal effect by applying different size of electrode diameters of 1.00 mm, 1.65 mm and 2.00 mm. The data show that the removal efficiency with thicker electrode is higher than the thinner one. However, the high voltage applied is a precondition.