线-板式介质阻挡放电反应器的优化
Optimization for a wire-plate dielectric-barrier discharge reactor
孙万启 1宋华 2白书培 2束继年 3孙春宝 4马挺军 5韩素玲2
作者信息
- 1. 中国科学院生态环境研究中心,北京100085;防化研究院,北京100083;北京科技大学土木与环境工程学院,北京100083
- 2. 防化研究院,北京100083
- 3. 中国科学院生态环境研究中心,北京100085
- 4. 北京科技大学土木与环境工程学院,北京100083
- 5. 北京农学院食品科学与工程学院,北京102206
- 折叠
摘要
研制了一种新型线-板式介质阻挡放电反应器.通过分析V-Q Lissajous图,得出了反应器放电过程的特征,以乙烯的降解率为指标,优化了反应器的结构,并考察了工艺参数(相对湿度、乙烯初始浓度和停留时间)变化对反应器性能的影响.实验结果表明,反应器放电时,输入功率的增加不会使放电电压增大,增加的是放电电流;优化后的反应器以2.5mm厚的陶瓷板做阻挡介质,以间距为0.5 mm的钼丝做电晕极,放电间距3 mm;乙烯的降解效率受湿度的影响小于10％,随初始浓度的增加或停留时间的减小而降低;最佳的工艺参数为湿度24％ (298 K)、初始浓度17 mg·m-3、停留时间1 s.与传统的平行板式反应器相比,该反应器起晕电压较低、能量效率较高,适于降解低浓度的乙烯气体.
Abstract
A novel wire-plate dielectric-barrier discharge reactor (WP-DBD-R) was developed.First,the characteristics of the discharge process for the WP-DBD-R were analyzed from a voltage/charge (V/Q) Lissajous figure.Then,the ethylene degradation efficiency (EDE) was employed as an index to optimize the structure of the WP-DBD-R.Finally,the effects of varying the technological parameters (relative humidities,initial concentrations,and retention times) on the WP-DBD-R performance were evaluated.The experimental results revealed that while the discharge current increased with the input power,increasing during the operation of the WP-DBDR,the discharge voltage did not change.Based on the optimal results of the WP-DBD-R,2.5 mm thick ceramic plates and molybdenum wires with a 0.5 mm spacing were selected as the dielectric and corona electrode,respectively;the width of the discharge gap was 3 mm.Relative humidities had a minor effect (＜ 10％) on the EDE,which decreased with increasing initial concentrations and lower retention times.When the relative humidity was 41％,a retention time of 1 s for 17 mg · m-3 of ethylene (initial concentration) resulted in the best performance of the WP-DBD-R.Compared to the traditional parallel-plate reactor,the WP-DBD-R has a lower ignition and higher energy efficiency.The WP-DBD-R is therefore fit for the degradation of low concentrations of ethylene.
关键词
线-板式反应器/低温等离子体/介质阻挡放电/乙烯降解/V-Q/Lissajous图Key words
wire-plate reactor/non-thermal plasma/dielectric-barrier discharge/ethylene degradation/voltage/charge Lissajous figure引用本文复制引用
出版年
2016
国家科技期刊平台
NSTL
维普
万方数据