采用辉光放电等离子体的烟气处理技术研究

Technology of flue gas treatment with glow discharge plasma

基于大气压空气辉光放电等离子体技术,采用多层网状接触式电极结构在烟道中形成大面积均匀稳定的辉光放电.利用放电过程中产生的强氧化活性粒子(·OH、O、O_3)氧化脱除烟气中的SO_2和NO_x.探讨接触式电极下辉光放电等离子体的生成特性和脱硫脱硝反应机制,分析不同电极层数、氧气浓度和待处理气体初始浓度等实验条件下的烟气处理效果.结果表明,在6层网状电极,氧气浓度为8%,烟气停留时间为1.2s的实验条件下,脱硫率在96.3%以上,NO氧化率为91.2%,脱硝率为36.7%.辉光放电等离子体以其高密度的带电粒子特性在烟气处理中显示出良好的能量利用效率.

Based on the technology of atmospheric pressure glow discharge plasma in air,a multilayer mesh-like contact type electrode structure was used to form a large-area,uniform and stable glow discharge in the flue.During the discharge process,particles with high oxidative activity(·OH,O,O3)were generated to remove the SO2and NOx in flue gas.The characteristics of glow discharge plasma and the mechanism of desulfurization and denitrification with the contact electrode were discussed.The effects caused by different electrode layer numbers,oxygen concentrations and initial concentrations of gas to be treated were also analyzed.The results showed that removal rates of96.3%for SO2,36.7%for NOx,and oxidation rate of91.2%for NO were obtained in the following experimental conditions:the layer number of mesh-like electrodes was6;the concentration of oxygen was8%;the reaction time of flue gas was1.2s.With its high density of charged particles,the glow discharge plasma showed good energy utilization efficiency in the flue gas treatment.