Development of a Compact High Efficiency Ozonizer for Effective Ut iization of Water Resources

为了提高臭氧的生成效率，提出了一种新型双放电臭氧发生器。在双重放电的情况下，阴极表面除主电极外，还分布着一个被玻璃管覆盖的第三电极，称为触发电极。在阴极上施加负高压，短时间后发生主放电，触发电极和阴极之间通过玻璃管发生弱电晕放电（即产生初始电子的预放电）。采用这种双放电方法，在He/02混合物和空气中均可直接在金属电极之间获得常压下的漫射辉光放电。在He/02混合物中获得了约400g/kWh的效率，放电体积约为917cm3。制作了同轴圆柱双放电型臭氧发生器，并测量了臭氧产生的特性。经证实，该装置能在大气压力下稳定运行。采用三种不同主间隙间距（2、3.5、5mm）的臭氧发生器对放电体积输入能量与触发电极与阴极之间注入能量之比、存储能量密度（=主电容上存储的能量/放电体积）、触发电路电容值等参数进行了优化。测量了不同放电频率下臭氧产生的效率，证实了效率几乎恒定（120g/kWh），并且在60Hz下获得稳定的辉光放电。

A new type ozonizer using double discharge has been proposed to improve the efficiency of the ozone generation. In case of the double discharge method, a third electrode called a trigger electrode covered with a glass tube is distributed on the cathode surface except the main electrodes. A weak corona discharge (i. e. pre-discharge for the generation of the initial electrons) occurs between the trigger electrode and the cathode through the glass tube when the negative high voltage is applied on the cathode and the main-discharge follows it after a short time. The diffuse glow discharge at atmospheric pressure is obtained between the metal electrodes directly by this double discharge method in both He/02 mixtures and air. The efficiency of about 400g/kWh has been obtained in He/02 mixtures with the discharge volume of about 917cm3.A coaxial cylindrical double discharge type ozonizer also is made and the characteristics of the ozone generation are measured. It is confirmed that this device is able to operate stably in air at atmospheric pressure. The ozonizers with three different main gap spacing (2, 3.5, and 5mm) have been used to optimize the parameters such as the ratio of the input energy into the discharge volume to the energy injected between the trigger electrode and the cathode, the stored energy density (=stored energy on the main capacitor / discharge volume), and the value of the capacitance in the trigger circuit etc.. The efficiency of the ozone generation is measured for different discharge frequency and it is confirmed that the efficiency is almost constant (120g/kWh) and a stable glow discharge is obtained up to 60Hz.