低温等离子体去除氯苯的研究

Study on Chlorobenzene Removal by Low-Temperature Plasma

本文以氯苯为目标污染物,利用低温等离子体处理氯苯,考察了放电过程中的电学特性、不同气量对低温等离子体去除氯苯效果的影响、CO2产生以及副产物(O3和NOx)产生情况。结果表明:放电时,外加电压在−17,500 V^7500 V之间呈周期性波动,放电电流峰谷值在−0.3 A~−0.2 A范围内。放电功率和氯苯去除效率均随着放电时间的延长而逐步增加直至稳定,放电功率稳定在6.8 W左右,氯苯去除率稳定在72%左右。反应生成的CO2 浓度也随着放电时间的延长而逐步增加并趋于稳定,达到1170 ppm。氯苯的降解效率随气量的增加而减小,当气量从500 mL/min增加到1500 mL/min时,在峰电压稳定在27 kV时氯苯的降解效率从74.43%降低到51.92%。

In this paper, chlorobenzene was treated by low-temperature plasma with chlorobenzene as the target pollutant. The electrical characteristics of the discharge process, the influence of different gas volume on the removal of chlorobenzene by low temperature plasma, the production of CO2 and the production of by-products (O3 and NOx) were investigated. The results show that the applied voltage fluctuates periodically from −17,500 V to 7500 V, and the peak to valley value of discharge current is in the range of −0.3 A~−0.2 A. The discharge power and the removal efficiency of chlorobenzene increased gradually with the prolongation of discharge time until stable. The discharge power was stable at about 6.8 W, and the chlorobenzene removal rate was stable at about 72%. The concentration of CO2 generated by the reaction increased with the discharge time and tended to be stable at 1170 ppm. The degradation efficiency of chlorobenzene decreased with the increase of gas volume. When the gas volume increased from 500 mL/min to 1500 mL/min, the degradation efficiency of chlorobenzene decreased from 74.43% to 51.92% when the peak voltage was stable at 27 kV.