单介质和双介质阻挡放电低温等离子体降解甲苯的比较  

Comparison of single and double dielectric barrier discharge non-thermal plasma for toluene removal

作　　者：于欣 党小庆 李世杰 黄准 郭惠 张金龙 YU Xin;DANG Xiaoqing;LI Shijie;HUANG Zhun;GUO Hui;ZHANG Jinlong(Key Laboratory of Environmental Engineering of Shaanxi Province,School of Environment&Municipal Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西省环境工程重点实验室,西安710055

出　　处：《环境工程学报》2020年第4期1033-1041,共9页Chinese Journal of Environmental Engineering

基　　金：陕西省重点研发计划(2018ZDCXL-SF-02-04);国家重点研发计划(2017YFC0212204)。

摘　　要：为研究介质阻挡放电(DBD)反应器结构对低温等离子体降解甲苯的影响,设计了具有单层介质和双层介质的DBD反应器。对2种反应器的放电特征、甲苯去除率、矿化率、CO2选择性和能量效率进行了比较,并对施加电压和初始浓度对甲苯降解效果的影响进行了分析。结果表明:在相同电压下,双介质反应器(DDBD)具有更高的电场强度,而单介质反应器(SDBD)的输入功率更高;当甲苯浓度和电压分别为616、1027、1848 mg·m-3和14~24 kV时,双介质中的甲苯去除率为9.4%~100%、7.4%~99%、5.1%~64%,单介质为67%~98%、46%~90%、26%~59%。这说明低电压下单介质反应器的甲苯去除率更高,而高电压下则相反,并且,浓度降低、电压升高有利于甲苯的降解。单介质反应器的能量效率随电压升高而降低,双介质反应器则先升高后下降,且双介质反应器的能量效率高于单介质反应器(16~24 kV)。以上研究可为介质阻挡放电在VOCs去除方面的应用提供参考。In order to investigate the effect of dielectric barrier discharge(DBD) reactor structure on toluene degradation in non-thermal plasma, reactors with single and double barrier were designed. The discharge characteristics, toluene removal efficiency, mineralization rate, CO2 selectivity and energy efficiency of the two rectors were compared, and the effects of voltage and initial concentration on toluene degradation were analyzed. The results indicated that DDBD reactor had higher electric field strength and SDBD reactor had higher power under the same applied voltage. The removal efficiency of toluene in the DDBD reactor ranged from 9.4%~100%, 7.4%~99%, 5.1%~64% and that in the SDBD reactor ranged from 67%~98%, 46%~90%,26%~59%, when the initial toluene concentration and the applied voltage were 616, 1 027, 1 848 mg·m-3 and were 14~24 kV, respectively. It showed that SDBD has a higher toluene removal efficiency at low applied voltage, while the removal efficiency is higher in DDBD at a higher applied voltage. Moreover, the decrease of toluene concentration and the increase of applied voltage were favorable for toluene degradation. In SDBD, the energy efficiency decreased with the increase of applied voltage, while that of the DDBD reactor first increased and then decreased. The energy efficiency of the DDBD reactor was higher than that of the SDBD reactor at16~24 kV. The present study could provide reference for the application of DBD in VOCs abatement.

关 键 词：介质阻挡放电 甲苯降解 低温等离子体 矿化率 能量效率 

分 类 号：X511[环境科学与工程—环境工程]