低温等离子体技术净化空气中的甲苯

等离子体技术是一种有效去除VOCs的方法. 介绍了等离子体净化技术的原理,通过甲苯净化实验,分析了在改变电压、污染物入口质量浓度等参数后净化效率的变化. 结果表明:在电压为9 kV,ρ(甲苯)小于12 g/m3时,反应器有较高的净化效率,尤其在低ρ(甲苯)时,净化效率可接近于100%. 实验还主要观察了副产物ρ(CO)的变化,在处理低ρ(甲苯)时,ρ(CO)较低;而随着ρ(甲苯)的增加,ρ(CO)增长较快. 等离子体协同催化实验提高了反应器的处理极限,通过添加催化剂,降低了CO的产生量,使有机物更多地转化为无害的CO₂;同时,由于反应器放电过程还会产生高浓度的臭氧,必须使用后置处理装置将其去除,以彻底实现无二次污染. 

Purification of Toluene in the Air by Nonthermal Plasma Technique

Plasma technique is an effective method to remove VOCs. The purifying principles of plasma technique were introduced. Through toluene purifying experiment, the change of purifying efficiency as the result of change of parameters such as the voltage and the influent toluene mass concentration was analyzed. The result shows that there will be a high efficiency when the voltage is 9 kV and the toluene mass concentration lower than 12 g/m^2 . Especially in low mass concentration, the purifying efficiency can approach 100% . The change of the mass concentration of by-product CO was also examined in this experiment. When the mass concentration of toluene is low, CO is also in a low level. With the increase of toluene mass concentration, the mass concentration of CO increases very soon. The catalysis-assisted nonthermal plasma technique can enhanced the treatment limit of the reactor. It can transform more organic pollutants to harmless CO2, and reduce the generation of CO. At the same time and as the result of electric discharge, the reactor will bring a high concentration of ozone, which should be treated by follow-up equipment to avoid secondary pollution.