The high-voltage discharge generator uses a high-voltage current of a certain frequency to create a high-voltage corona electric field, so that the oxygen molecules in or around the electric field undergo electrochemical reactions to produce ozone. This kind of ozone generator has the advantages of mature technology, stable operation, long service life and large ozone output (single machine can reach 1Kg/h), so it is widely used in related industries at home and abroad. In the high voltage discharge ozone generator is divided into the following types:
1. According to the high-voltage electrical frequency of the generator, there are three types: power frequency (50-60Hz), intermediate frequency (400-1000Hz) and high frequency (>1000Hz). Due to the disadvantages of large size and high power consumption, power frequency generators have basically withdrawn from the market. Medium and high frequency generators have the advantages of small size, low power consumption, and large ozone output, and are now commonly used products.
2. According to the gas raw materials used, there are two types: oxygen type and air type. The oxygen type is usually supplied with oxygen from an oxygen cylinder or an oxygen generator. Air type usually uses air (such as compressed air) as the raw material. Since ozone is produced by oxygen, and the oxygen content in the air is only 21%, the ozone concentration produced by the air-type generator is relatively low, and nitrogen compounds are also derived. The oxygen purity of the bottled or oxygen generator is above 90%, so the ozone concentration of the oxygen generator is higher. For environmental disinfection, air-type generators are usually used. In water treatment, oxygen-type generators should be given priority. However, if the generator needs to be used with the old ozone mixing tower when sterilizing drinking water, only the air type can be used.
3. According to the cooling method, there are water cooling type and air cooling type. When the ozone generator is working, it will generate a lot of heat energy, and it needs to be cooled, otherwise the ozone will be decomposed due to the high temperature. The water-cooled generator has good cooling effect, stable operation, no ozone attenuation, and can work continuously for a long time, but the structure is complex and the cost is slightly higher. The air-cooled cooling effect is not ideal, and the ozone attenuation is obvious. Large generators or generators used in important locations are usually water-cooled. Air cooling is generally only used for generators with small ozone output or places where the performance requirements of the generator are not strict. When choosing a generator, try to use a water-cooled type.
4. Divided by dielectric materials, there are several common types such as quartz tube, ceramic plate, ceramic tube, glass tube and enamel tube. Among them, the quartz tube has the characteristics of high dielectric constant, uniform wall thickness, good ovality, high temperature resistance and moisture resistance.
Often used by some high-performance ozone generators. The ceramic plate is easy to be brittle and cracked, and it is only suitable for some small generators. The wall thickness and ovality of the ceramic tube are not easy to control, and the problem of uneven discharge is prone to occur, so it is not used much. Glass tubes and enamel tubes have low dielectric constant, poor high temperature resistance and easy to burst, and are only used on some low-end generators.
5. According to the structure of ozone generating parts, there are two types: closed type and open type. The structural feature of the closed generator is that the sealing body itself is the electrode, and the ozone can be used intensively, such as for water treatment. The electrodes of the open generator are exposed to the air, and the generated ozone cannot be used centrally. It is usually only used for air purification in a small space or surface disinfection of some small items. A closed generator can be used in place of an open generator. The cost of closed generators is much higher than that of open generators. It is worth noting that some people now rigidly package open generators and pretend to be closed generators. The result of this is that because a large amount of heat cannot be dissipated in time, the ozone is seriously attenuated, and the generator is quickly burned out.