Development of a new screen type ozonizer with rod-to-rod electrodes and it's application to air pollution treatment

无声放电主要用于臭氧发生器中的臭氧生成。最实用的臭氧发生器有一个同轴圆柱形电极系统的间距为1-2毫米和1-2米的长度。在这种电极几何结构中，当气体通过狭长的放电间隙场时，无声放电产生的臭氧被下一次放电破坏。在本研究中，采用棒对棒电极系统代替传统的同轴圆柱形电极系统。所提出的臭氧发生器由9个电极系统单元组成，它们并联安装在一个箱式反应器中。因此，在这种臭氧发生器中，可以产生筛网式排出物。主要研究结果总结如下：(1)臭氧发生器采用1单元棒对棒电极系统时，最佳间隙间距为0.7 ~ 1.0 mm。沿间隙可获得丝状均匀放电。(2)在空气流量为2 L/min的情况下，采用三电极筛网的臭氧发生器，干燥空气的最大臭氧生成效率为123 g/kWh（放电功率0.7 W，臭氧浓度340 ppm），氧气的最大臭氧生成效率为375 g/kWh（放电功率0.5 W，臭氧浓度745 ppm）。(3)三屏臭氧发生器的典型臭氧生成特性为臭氧浓度为2500 ppm，臭氧生成效率为空气100 g/kWh，氧气5500 ppm和200 g/kWh。(4)空气最大臭氧浓度为3400 ppm（臭氧产生量为860 mg/h，臭氧生成效率为82 g/kWh），氧气最大臭氧浓度为6800 ppm（臭氧产生量为1740 mg/h，臭氧生成效率为173 g/kWh）。

The silent discharge is mainly used for ozone generation in an ozonizer. Most practical ozonizer has a coaxial cylindrical electrode system with a gap spacing of 1-2 mm and 1-2 m length. In this electrode geometry, ozone created by a silent discharge is destroyed by next discharge when gas passes the narrow and long discharge gap field. In this study, instead of conventional coaxial cylindrical electrode system, a rod-to-rod electrode system is used. The proposed ozonizer consists of nine units of the electrode system which are mounted in parallel in a box type reactor. Therefore, in this ozonizer, a screen type discharge can be produced. The main results are summarized as follows.(1) In the case of the ozonizer with one unit of rod-to-rod electrode system, the optimum gap spacing was 0.7-1.0 mm. Filamentary uniform discharge can be obtained along the gap.(2) Maximum ozone generation efficiency of 123 g/kWh (discharge power 0.7 W, ozone concentration : 340 ppm) for dry air and 375 g/kWh (discharge power 0.5 W, ozone concentration : 745 ppm) for oxygen was obtained in the ozonizer with three electrode screens at the gas flow rate of 2 L/min.(3) Typical ozone generation characteristics of ozone concentration : 2500 ppm and ozone generation efficiency : 100 g/kWh for air and 5500 ppm and 200 g/kWh for oxygen are obtained in three screens ozonizer.(4) Maximum ozone concentration of 3400 ppm (amount of ozone generation : 860 mg/h, ozone generation efficiency : 82 g/kWh) for air and 6800 ppm (amount of ozone generation : 1740 mg/h, ozone generation efficiency : 173 g/kWh) for oxygen are obtained.