三相介质阻挡放电产生过氧化氢的条件优化

Optimized Conditions for Formation of Hydrogen Peroxide by Three-phase Dielectric Barrier Discharge

过氧化氢、臭氧和羟基自由基等是介质阻挡放电过程中产生的主要活性粒子,其中过氧化氢对水中污染物质的去除起重要作用。为考察多高压电极介质阻挡放电反应器对放电过程中过氧化氢浓度的影响,采用线筒式三相介质阻挡放电反应器,用正交实验研究了高压电极材料、数目以及高低压电极间距的改变对过氧化氢浓度的影响。结果表明:影响过氧化氢浓度的因素显著性顺序为电极种类、高低压电极间距、电极数目;当3根直径为3mm的不锈钢丝作高压电极且高低压电极间距为13 mm时,系统产生的过氧化氢浓度最高;在最佳的系统条件下,提高空气流量、峰值电压和放电频率,降低电导率都有利于过氧化氢的生成。系统产生的最高过氧化氢浓度为64.2μmol/L。

To check the effect of the multi-high-electrode dielectric barrier discharge （DBD） reactor on the production of hydrogen peroxide, this paper investigated the effect of the material, representation and gap distance of high voltage electrodes on the production of hydrogen peroxide in the wire-to-cylindrical type three-phase DBD reactor by the orthogonal experiments. The experimental results show that the sequence influencing the production of hydrogen peroxide is the material, gap distance and representation of high voltage electrodes. When the number of high voltage electrode made in stainless steel is 3 with a gap distance of 13mm, the concentration of hydrogen peroxide produced by the system is the highest. Under the optimization condition, an increasing of the gas flow rate, peak pulse voltage and pulse repetitive rate and the decreasing of the solution conductivity are benefit to the formation of hydrogen peroxide. When the gas flow rate increases from 0.25 m^3/h to 0.75 m^3/h after a treatment of 40 min, the concentration of hydrogen peroxide increased from 50.3 μmol/L to 64.2 μmol/L. More energy was input into the reactor by the increased peak pulse voltage and pulse repetition rate, and the lower solution conductivity is easy to produce the partial discharge. The maximum concentration of hydrogen peroxide is 64.2 μmol/L.