Working principle of ozone generator

06-07-2020

Working principle of ozone generator

 

Working principle of ozone generator

Divided according to the way ozone is generated, there are currently three main types of ozone generators: high-pressure discharge type, ultraviolet radiation type, and electrolytic type.

1. High-voltage discharge generator.

This type of ozone generator uses a high-frequency current of a certain frequency to create a high-voltage corona electric field, which causes electrochemical reactions of oxygen molecules in or around the electric field to produce ozone.

This ozone generator has the advantages of mature technology, stable operation, long service life, large ozone output (up to 1Kg/h in a single machine), etc., so it is the most widely used ozone generator in related industries at home and abroad.

In the high-pressure discharge ozone generator, it is divided into the following types:

1. According to the generator's high-voltage electrical frequency, there are three kinds of power frequency (50-60Hz), intermediate frequency (400-1000Hz) and high frequency (>1000Hz). Due to the shortcomings of large size and high power consumption, the power frequency generator has basically withdrawn from the market.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 the most commonly used products now.

2. Divided according to the gas materials used, there are two types of oxygen and air. Oxygen type is usually supplied by oxygen cylinder or oxygen generator. Air type usually uses clean and dry compressed air as raw material. Because ozone is generated 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 the oxygen purity of the bottled or oxygen generator is above 90%, so the oxygen type The ozone concentration of the generator is high.

3. Divided according to the cooling method, there are water-cooled type and air-cooled type. A large amount of heat energy is generated when the ozone generator works, and it needs to be cooled, otherwise ozone will be decomposed while being generated due to high temperature. The water-cooled generator has good cooling effect, stable operation, no attenuation of ozone, and can work continuously for a long time, but the structure is complicated and the cost is slightly higher. The air-cooled cooling effect is not ideal, and ozone attenuation is obvious. High-performance ozone generators with stable overall performance are usually water-cooled. Air cooling is generally only used for low- and middle-grade ozone generators with low ozone production. When choosing generators, water-cooled ones should be used as much as possible.

4. Divided by dielectric materials, there are several types of quartz tubes (a kind of glass), ceramic plates, ceramic tubes, glass tubes and enamel tubes. At present, ozone generators made with various types of dielectric materials are available in the market, and their performances are different. The low cost of glass dielectrics and stable performance are one of the earliest materials used for artificial ozone production, but the mechanical strength is poor. Ceramics are similar to glass, but ceramics are not suitable for processing, and their use is restricted in large ozone machines. Enamel is a new type of dielectric material. The dielectric and electrode are integrated into one body with high mechanical strength and high precision. It is widely used in large and medium-sized ozone generators, but the manufacturing cost is high.

5. According to the structure of ozone generator, there are gap discharge type (DBD) and open type. The structure characteristic of the gap discharge type is that ozone generates ozone in the gap between the inner and outer electrode sections. Ozone can be collected and output in a concentrated manner, and its concentration is high, such as for water treatment. The electrodes of the open generator are exposed in the air, and the generated ozone is directly diffused into the air. Because of the low ozone concentration, it is usually only used for air sterilization in small spaces or surface disinfection of certain small items. Gap discharge generators can be used instead of open generators. But the gap discharge type ozone generator cost is much higher than the open type.

 


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