介质阻挡放电处理甲苯及其放电参量的研究

Dielectric barrier discharge treatment for removing toluene

采用等离子体反应器介质阻挡放电产生低温等离子体处理甲苯,在分析负载等效电路的基础上,利用电压—电荷Lis-sajous图形法对气体放电过程中的放电参量进行测量研究,并探讨了相关工况参数对甲苯去除率的影响。研究结果表明,该反应器所得能量随着电压的增大而增大;气隙等效电容随着外加电压和气隙厚度的增大而减小;电压较低时,电介质等效电容变化不大,随着电压的增大迅速升高,当电压达到一定值后,电介质等效电容变化平缓;该反应器采用粗电极对甲苯的去除率优于细电极;甲苯的去除率随着放电功率的上升而提高,但是能量效率却呈降低的趋势。此外,研究发现甲苯的初始浓度与气体流量与甲苯的去除率呈反比,而与甲苯的绝对去除量呈正比。

Experimental runs of toluene removal by the non-thermal plasma of dielectric barrier discharge were carried out in a coaxial cylindrical reactor to determine the effects of major operating （discharge） parameters on the treatment effectiveness. The discharge parameters of the plasma treatment were measured using the Q-V Lissajous di- agram based on analysis of the load equivalent circuits. A higher applied voltage resulted in a higher energy input but a lower equivalent capacitance of the gap （Cg） which was also the result of a higher gap distance. The equivalent capacitance of the dielectric barrier （Ca） increased slowly with increasing voltage, with a slow rise initially followed by a rapid rise and finally stabilized with further increase in the applied voltage. The toluene removal efficiency in- creased with the size of the electrode and/or the discharge power at the expense of lower energy efficiency. While the total amount of toluene removed increased with a higher inlet concentration of toluene and/or a higher gas flux, the removal efficiency was lower however.