流向变换等离子体催化系统去除甲苯

Removal of toluene with a reverse flow non-thermal plasma-catalytic reaction system

将低温等离子体、催化和流向变换技术相结合,以反应系统参数(接地极方式、反应管壁厚)和电源参数(电压、频率)为影响因素,探究了上述因素对系统温度升高(△T)、放电能量密度(SED)和能量效率(EE)的影响,考察了不同条件对甲苯的去除效果(η)和反应产物的影响.结果表明:流向变换低温等离子体协同催化系统中,甲苯去除效果最好,能量利用率最高,为3.76g/(kW·h).连续升压时,3种接地条件下的温度升高△T差距不明显;铝箔接地时,03浓度最高、甲苯去除率η、SED和EE最高;增加反应管壁厚,系统△T、η、SED和EE减小.3种技术结合时,NO2生成浓度低、有机副产物生成种类较少,CO2选择性高,甲苯矿化率最高.固定频率,改变电压时,△T、η、SED与电压值呈正比,EE则相反,铝箔接地时,17kV时△T达到110.7℃,η达到74.05%;副产物O3浓度先上升后下降,最终趋于Omg/m3;固定电压,改变频率时,变化规律一致.

Combined with NTP,catalysis and reverse-flow technology,the effects on the temperature rise(△T),specific energy density(SED) and energy efficiency(EE) of the system were investigated under the influence of different reaction system(grounding mode,wall thickness) and power supply(voltage and frequency).The effects of toluene removal(η) and products were also analyzed The results showed that the reverse flow non-thermal plasma-catalytic reaction system had the best η and EE,which was3.76 g/(kW·h).The differences in △T under three grounding conditions were not significant when voltage was increased continuously.The concentrations of O3,η,SED and EE were the highest when the aluminum foil was grounded.The △T,η,SED and EE decreased with the increase of wall thickness.When three technologies were combined,NO2 was less generated,fewer types of organic by-products were produced,the CO2 selectivity was high and the toluene mineralization rate were highest.When the frequency was fixed,the △T,η,SED were positively proportional to the voltage as voltage increased,while the EE showed the opposite correlation with voltage.When aluminum foil was grounded,the △T achieved 110.7℃and the η was 74.05%.The concentration of the byproduct(O3) increased in the beginning,then decreased,and finally became Omg/m3.When the frequency changed while the voltage was fixed,the change rules were the same.