摘要
针对汽车尾气控制和防治,自制了同轴管介质阻挡放电催化反应器,并采用石英玻璃作为绝缘介质层处理了汽油机尾气。研究脉冲放电频率、脉冲电压、气体流量qV、NO初始体积分数0φ(NO)等对NO、HC和CO去除率影响的结果表明,NO、HC和CO的去除率随脉冲电压、脉冲频率的增加而增加,随φ0(NO)及qV的增加而减小。当脉冲频率为15 kHz、脉冲电压为15 kV、0φ(NO)=100×10-6、工作气体qV=0.05m3/h,并以γ-Al2O3小球作为催化剂时,NO、HC和CO的去除率分别为82.3%,83.2%和48.6%;而若不加γ-Al2O3小球,NO、HC和CO的去除率在相同条件下分别只能达到68.1%、76.0%和41.9%。可见,-γAl2O3小球的加入有利于提高污染物的去除率。研究表明,介质阻挡放电产生的低温等离子体在催化剂的协同作用下处理汽车尾气效果较好。
Automotive exhaust is one of the major sources causing environmental pollution. It contains a mass of NOx, HC and CO, which is very harmful to human body. In order to increase the removal rates of pollutants from automotive exhaust and the utilization rate of plasma, coaxial cylinder tube dielectric-barrier discharge reactor with catalyst is designed. When treating automotive exhaust by dielectric-barrier discharge reactor with quartz glass as dielectric barrier materials, the removal rates of NO, HC and CO under different pulsed frequency, pulsed voltage, gas flow and the commencing concentration of NO are investigated. The results show that the removal rates of NO, HC and CO increase with the addition of pulsed voltage, pulsed frequency and the reducing of the commencing concentration of NO and gas flow. But with the addition of pulsed frequency the change range of the removal rates of pollutants is smaller than other factors. Thus exorbitant pulsed frequency is unnecessary. The removal rates of NO, HC and CO are respectively 82. 3%, 83. 2% and 48.6% in the condition of pulsed frequency 15kHz, pulsed voltage 15kV, the commencing concentration of NO 100mL/m^3 and gas flow 0. 05m^3/h with γ-Al2O3 pellet bed as catalyst. But the removal rates of NO, HC and CO can only reach 68. 1%, 76.0% and 41.9% respectively without γ-Al2O3 pellet bed. So γ-Al2O3 pellet bed is obviously helpful to increase the removal rate of pollutants, especially to increase the removal rate of NO. Research shows that dielectric-harrier discharge can product low temperature plasma. When it is applied to treat automotive exhaust with the synergetic effect of catalyst, perfect removal effect of pollutants can be gained. So catalysis-assisted low temperature plasma is feasible to treat real automotive exhaust and raise the control level of pollutants from vehicle emissions.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2007年第2期174-177,共4页
High Voltage Engineering
基金
江苏省教育厅资助项目(03KJD610059)
