放电等离子体降解三氯乙烯

采用2种放电方式和2种反应器对三氯乙烯进行降解,脉冲放电和交流放电均对三氯乙烯有较好的降解效果,且电压越高降解率越大.对脉冲放电,当气体停留时间为15s、三氯乙烯初始浓度1350mg/m³、电压42kV时空腔式反应器对三氯乙烯的降解率接近100%;对交流放电,使用32kV的电压可使降解率达98%,且频率越高降解效果越好.与脉冲放电相比,交流放电的功率消耗量大、能量利用率低,且填充式反应器的能量利用率也低于空腔式反应器.对于空腔式反应器,三氯乙烯降解率达80%时所需的脉冲和交流放电能量消耗分别为4.9W·h/m³和116W·h/m³.

Degradation of Trichloroethylene by Discharge Plasma Process

Two types of discharge and two kinds of discharge reactors was employed to decompose trichloroethylene (TCE) in air. The results showed that both pulsed discharge and AC discharge were efficient to the degradation of TCE. Under the pulsed discharge with peak voltage of 42kV, gas resident time of 15s and TCE initial concentration of 1350mg/m³, the degradation efficiency of TCE was close to 100% in the hallow reactor and the higher voltage results in a higher degradation efficiency. For the AC discharge, the degradation efficiency of TCE reached 90% with applied voltage of 30kV. Meanwhile, increasing the applied frequency of AC voltage can enhance the degradation of TCE. The energy consumption for TCE degradation by AC discharge was higher than that by pulsed discharge. The energy consumption for TCE degradation efficiency of 80% by pulsed and AC discharge were 4.9W·h/m³ and 116W·h/m³, respectively. In addition, the energy consumption in the packed reactor was higher comparing with that in the hallow one.