基于BP网络的等离子体法去除VOC_s实验研究

Destruction of Toluene Gas Based on Non-thermal Plasma Technology with BP Network Analysis

低温等离子体技术处理VOCs是目前国内外的研究热点。本实验研究通过电晕放电和介质阻挡放电相结合的方法,将实验装置划分为电源系统、配气系统和等离子体反应系统三大组成部分,探讨的相关的六种工况参数对甲苯去除效率的影响。在数据处理中运用BP神经网络的数值逼近和MATLAB三维可视化技术,对实验结果作了理论分析。研究结果表明,电压的升高有利于甲苯污染物的去除;频率对甲苯去除效率的影响与反应器材质和电源变压器的漏感有关,频率处于系统谐振频率附近对甲苯的去除效果有利。气体流量与进口浓度对甲苯去除效果的影响相似,随着气体流量的增大与进口浓度的上升,甲苯的去除效率下降,但气体流量对去除效率的影响程度较大。实验还考察了反应器直径和内电极直径对甲苯去除效率的影响,结果表明,对于直径较大管径,细电极更有利于甲苯的去除;而对于直径较小管径,粗电极的效果较好。

Destruction of toluene gas based on Non-thermal plasma technology is paid more attention in recent years. Based on the combinational derived methods of corona discharge and dielectric barrier discharge, the paper divided the experiment units into power system, match gas system and plasma reaction system, discussed six parameters which will affect the removal rate. We use both BP neural network based numerical approximation methods and MATLAB based 3-dimensional technology to process the data. The results show that the higher voltage potential will benefit the destruction of toluene; the removal rate of toluene according to the signal frequency is related to the leakage inductance of transformer, on the resonance frequency, the highest removal rate of toluene will be achieved. The gas flux has similar effect on removal of toluene as the initial concentrations do. The higher is the gas flux, the lower is the removal rate. The denser is the initial concentrations, the lower is the removal rate got. The gas flux, however, have greater effects than initial concentrations. Experiments results also show that varying the electrode diameter and tube diameter have some effects on the removal rate too. The larger electrode diameter with thinner tube diameter, as well as the smaller electrode diameter with thicker tube diameter will benefit the removal of toluene.