高频介质阻挡放电降解甲苯的实验研究

Experimental Research on Toluene Decomposition with High Frequency DBD

甲苯作为一种广泛使用并非常有害的有机废气,已在很多场合对人类健康构成严重威胁。为此,采用高频交流高压电源,通过介质阻挡放电产生低温等离子体,用来去除甲苯污染物,进一步优化等离子净化系统。从电路原理和介质阻挡放电原理实验研究了反应器结构、电压、频率和功率对甲苯降解率的影响,并分析了降解产物及其降解机理。实验结果表明,99陶瓷作介质阻挡层更有利于甲苯的降解;频率、功率和降解率之间的关系并非单纯的线性关系,f=f0时,放电负载得到最大功率,降解率也达到最高值。色质联用检测仪(GC-MS)的检测发现,中间产物包括醛类、醇类、酰胺类及带有苯环的衍生物等4类有机物。

It is necessary to remove toluene due to its doing harm to people＇s health in its wide use. Dielectric barrier discharge （DBD） produces non-thermal plasma to remove toluene using high frequency alternating current （AC）. Based on the elements of circuit and DBD, the effects of reactor structure, voltage, frequency and power on removal efficiency of toluene were tested. The byproducts and decomposition mechanism of toluene were analyzed. The experimental results show the 99-ceramic reactor of DBD is helpful for toluene removal than the quartz glass reactor. The frequency and power are nonlinearly related with the removal efficiency. If harmonic frequency occurs, the highest power belongs to reactor, and removal efficiency reaches its maximum value. The byproducts include aldehyde, alcohols, amide, and benzene detected by GC-MS.