脉冲电晕等离子体降解二噁英前驱物三氯苯的影响因素分析

ANALYSIS OF INFLUENCING FACTORS ON DEGRADATION OF TRICHLOROBENZENE,A PRECURSOR OF DIOXIN BY PULSE CORONA PLASMA

氯苯是产生二噁英的主要前驱物。利用脉冲电晕等离子去除三氯苯,从电源参数电压、频率、脉宽、上升沿几个方面探讨了其对三氯苯去除效果及作用机理。结果表明:1)在输入电压16 kV,频率300 Hz,脉宽100 ns,上升/下降沿100 ns的条件下,三氯苯去除率最高可达70%左右。2)当输入频率500 Hz,脉宽100 ns,上升/下降沿100 ns时,三氯苯去除率随着电压升高增大;当输入电压分别为14,16 kV,脉宽100 ns,上升/下降沿100 ns时,调节频率为100~800 Hz,随着频率升高,三氯苯去除率增大,继续增加频率,三氯苯去除率不变。3)脉宽和上升沿对三氯苯的处理效果影响不大。同时对脉冲电晕等离子体降解三氯苯的机理进行探讨,认为其降解主要是通过巨大能量引起断键脱氯脱氢,其次是氧化。

As a major precursor of dioxins,trichlorobenzene removal by pulse corona plasma was discussed in this paper.The effect of plasma on removal of trichlorobenzene was also investigated from the aspects of voltage,frequency,pulse width and rising edge of power supply parameters.The removal mechanism was also discussed.The results showed that:the removal efficiency of trichlorobenzene could be up to 70% at an input voltage of 16 kV,a frequency of 300 Hz,a pulse width of 100 ns,and a rising/falling edge of 100 ns.At the conditon of frequency 500 Hz,pulse width 100 ns,rising/falling edge 100 ns,trichlorobenzene removal efficiency increased with voltage;and at the conditon of pulse width 100 ns,rising/falling edge 100 ns,input voltage of 14 kV and 16 kV,in regulation frequency range of 100~800 Hz,the removal efficiency of trichlorobenzene increased as the frequency increased,and stayed stable if regulation frequency exceeded 800 Hz.Pulse width and rising edge had little effect on treatment effect of trichlorobenzene.It was believed that the trichlorobenzene degradation might be mainly caused by debonding and dehydrogenation of the bond,followed by oxidation.