摘要
研制了一种喷射式线-筒放电反应器,在室温条件下进行了降解实际空气流中甲苯的实验研究。结果表明,该反应器能够有效降解甲苯,但不同的通气方式对甲苯降解率有显著影响,验证了该反应器设计的合理性。同时证明,通过流场控制可以提高甲苯降解率。电场方向与气流方向一致则强化降解,两者方向相反则弱化降解。当电压为34kV时,正脉冲和负脉冲的甲苯降解率相差高达42.5%。当电压小于火花放电电压时,甲苯降解率随着电压的增大而升高;当电压过大时,电极间发生火花放电,甲苯降解率不升反降。小电压时,小电容放电的甲苯降解率较高;但随着电压的增大,大电容的优势得以体现。甲苯降解率随气流中甲苯初始浓度的升高而降低;随气体流量的增大而降低;环境湿度过大时,甲苯降解率下降,并且甲苯氧化不完全,有CO生成。
A gas-stream wire-cylinder discharge reactor was developed for toluene decomposition in real air flow under atmosphere pressure and room temperature.The reactor presented perfect efficiency on toluene decomposition,and the effects of gas introduction way,pulse polarity,discharge voltage,discharge capacitance and initial toluene concentration on decomposition efficiency were investigated.The results demonstrated that gas introduction way could vary flow field in reactor and then influence the toluene decomposition efficiency.The consistent direction of electric field and air flow enhanced toluene decomposition,while,the opposite direction weakened the toluene decomposition.The decomposition efficiency increased with increasing the discharge voltage,but too high of discharge voltage decreased the toluene decomposition efficiency for spark discharge was created between two electrodes.In the stage of low voltage,the decomposition efficiency by small capacitance discharge was higher,but the advantages of larger capacitance appear gradually with the increase in voltage.The decomposition efficiency decreased with increasing initial concentration of toluene and gas flow rate.Higher environment humidity decreased toluene decomposition and hampered the complete oxidation of toluene for CO was found in the oxidation production.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2010年第6期11-14,18,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助重点项目(No.50237010)
世纪优秀人才支持计划项目(No.NET-04-1006)
全国优秀博士学位论文作者专项资金资助项目(No.200136)
海军工程大学科研基金资助项目(No.E314)
关键词
空气净化
脉冲放电
挥发性有机物
流场
电场方向
air purification
pulsed discharge
VOCs
flow field
direction of electric field
