非平衡等离子体降解两种不同VOCs的研究

Degradation of Two Kinds of VOCs by Non-equilibrium Plasma

实验以甲醛和苯乙烯为研究对象,采用介质阻挡放电,考察了放电电压、初始浓度和停留时间对他们降解率的影响,并对两者的能耗进行了分析。研究发现甲醛和苯乙烯的降解率随放电电压、初始浓度和停留时间的增大均呈现不同的变化趋势:随着放电电压和停留时间的增大,甲醛的降解率较苯乙烯增加得慢,且达到一定值后有趋于平缓的趋势;而当初始浓度增大时,甲醛的降解率先增大后减小,出现一个最佳降解浓度区域,苯乙烯的降解率则直接快速减小;在输入的能量较高时,苯乙烯的能量利用率更高。

Degradation of two kinds of VOCs including formaldehyde and styrene in DBD plasma was studied. Influence of discharging voltage, initial concentration and retention time on degradation efficiency was investigated. Energy consumption for degradation of the two substances was also analyzed. Results indicated that degradation rate showed different tendencies with increasing of discharging voltage, initial concentration and retention time. With increasing of discharging voltage and retention time, increasing velocity of formaldehyde was slower than that of styrene, and it tended to be mild at a certain voltage. However; degradation rate of styrene was dropping obviously with initial concentration increasing, while for formaldehyde, degradation rate was going up and then going down with initial concentration increasing, and showed an optimal concentration area of degradation. With higher input energy, energy utilization rate of styrene was higher than that of formaldehyde.