不同电极结构等离子体反应器的放大试验研究

应用脉冲放电等离子体技术,在三种不同电极结构的线板式反应器内对模拟甲苯废气的净化进行了放大试验.三种反应器是A-无阻挡式、B-陶瓷板阻挡式和C-陶瓷板阻挡并负载MnOx催化剂式.采用一种基于闸流管开关、Blumlein脉冲形成网络和脉冲变压器技术的高压脉冲电源,其最大输出功率为1kW,最大脉冲电压峰值为100kV.试验结果表明: 当甲苯的初始质量浓度为5.4g/m3、处理气量为4m3/h、峰值电压为67kV、重复频率为300Hz时,反应器A的甲苯去除率为47%,B为64%,C可达80%;当能量密度相同时,C的甲苯能量利用率最高,B次之,A最低;陶瓷板的阻挡有效地降低了反应器放电产生的臭氧质量浓度;当峰值电压相同时,陶瓷板的阻挡有利于提高次峰电压、峰值电流、峰值功率、单脉冲能量及其注入反应器的平均功率;MnOx催化剂的存在可强化放电等离子体去除甲苯的过程.

Scale-up experiment of plasma reactors with different electrode structure

The scale-up experiment of toluene decomposition by pulse corona discharge in three types of wire-plate reactors were investigated. A high-pulse voltage source based on thyratron switch, Blumlein pulse forming network and pulsed transformer was adopted, whose maximum output power and peak voltage were 1()kW and 100()kV respectively. Study of the effects of dielectric barrier and catalysis showed that the removal efficiency of three types of reactors (A: no dielectric barrier; B: ceramic plate barrier; C: ceramic plate barrier with MnO_x catalyst) were 47%, 64%, 80% respectively, when inlet concentration of toluene, gas-flow rate, peak voltage, pulse frequency were 5 4 g/m~3,4 m~3/h, 67 kV, 300 Hz respectively. The energy yield relation of three types of reactors was in the order A < B < C, when the energy density was the same. The outlet mass concentration of ozone was effectively decreased with the ceramic plate barrier. The electrical parameters such as sub-peak voltage, peak current, peak power, single pulse energy and total power in the ceramic plate barrier reactor B, C were higher than those of A, consequently, the number of electrons one pulse produced and the electron mean energy were improved. The removal process could be enhanced when catalyst were impregnated on the ceramic plate.