By the way the ozone is generated, the current ozone generator has three main types: high-voltage discharge, ultraviolet irradiation, electrolytic. Ozone generator principle>>
1, high-voltage discharge generator
Use a certain frequency of high-voltage current to create a high-voltage corona electric field, so that the electric field or the oxygen molecules around the electric field electrochemical reaction, so as to create ozone. This kind of ozone generator has the advantages of mature technology, stable work, long service life, large ozone production (single machine up to 1Kg/h), so it is the most widely used ozone generator in related industries at home and abroad.
In the high-voltage discharge ozone generator is divided into the following types:
(1) according to the generator of high-voltage electric frequency division
There are three kinds of industrial frequency (50-60Hz), intermediate frequency (400-1000Hz) and high-frequency (>1000Hz). Industrial frequency generator due to large size, power consumption and other shortcomings, has basically withdrawn from the market. Medium and high-frequency generator has a small size, low power consumption, ozone production and other advantages, is now the most commonly used products.
(2) according to the use of gas raw materials
There are two types of oxygen-type and air-type. Oxygen type is usually supplied by oxygen cylinders or oxygen generators. The air type usually uses air (such as compressed air) as the raw material. Since ozone is produced by oxygen, and the oxygen content of air is only 21%, the air-type generator produces a lower concentration of ozone and also derives nitrogen compounds. On the other hand, the purity of oxygen in bottled or oxygen generators is above 90%, so the concentration of ozone from oxygen-based generators is higher. For environmental disinfection, air-type generators are usually used. For water treatment, oxygen-type generators should be preferred. However, if the generator needs to be used with the old ozone mixing tower when disinfecting drinking water, only the air type can be used.
(3) according to the cooling method
There are water-cooled and air-cooled type. Ozone generator work will produce a lot of heat, need to be cooled, otherwise the ozone will be high temperature and the side of the decomposition. Water-cooled generator cooling effect is good, stable, ozone non-decay, and can work continuously for a long time, but the structure is complex, the cost is slightly higher. Air-cooled cooling effect is not ideal, ozone attenuation is obvious. Large generators or important places to use the generator are usually water-cooled. Air-cooled is generally used only for smaller ozone production generator or generator performance requirements are not strict places. When choosing a generator, you should try to use the water-cooled type.
(4) divided by dielectric material
Commonly found in quartz tubes, ceramic plates, ceramic tubes, glass tubes and enamel tubes and other types. Among them, the quartz tube has a high dielectric constant, wall thickness uniformity, good ellipticity, high temperature, moisture and other characteristics of the most commonly used by some high-performance ozone generator. Ceramic plate is easy to brittle, only for some small generators. Ceramic tube wall thickness and ellipticity is not easy to control, easy to discharge uneven problems, so not much use. Glass tube and enamel tube dielectric constant is low, poor high temperature resistance, easy to blow up, only in some low-end generators.
(5) according to the structure of the ozone generating components
There are two types of closed and open. The structure of the closed generator is characterized by the sealing body itself is the electrode, ozone can be used centrally, such as for water treatment. Open generator electrode is exposed in the air, the ozone produced can not be centralized use, usually only used for small space air purification or surface disinfection of some small items. Closed type generators can be used instead of open type generators. The cost of closed type generators is much higher than open type generators. It is important to note that some people are now hard-wrapping open generators and passing them off as enclosed generators. The result of this is that due to the large amount of heat can not be emitted in a timely manner, ozone attenuation is serious, the generator is also quickly burned.
2, ultraviolet ozone generator
Use a specific wavelength (185mm) of ultraviolet light irradiation of oxygen molecules, so that the decomposition of oxygen molecules to produce ozone. Due to the large size of the ultraviolet lamp, low ozone production, the use of short life, so the use of this generator is narrower, commonly used in the disinfection of the dishwasher on the use.
3, electrolysis generator
Only through the electrolysis of pure water to produce ozone. This generator can produce high concentrations of ozone water, low manufacturing costs, use and maintenance is simple. But because of the ozone production can not do big, electrode life short, ozone is not easy to collect and other aspects of the shortcomings of the scope of its use is limited. At present, this generator is only in some specific small equipment or some specific places to use, do not have to replace the conditions of high-voltage discharge generator.
In summary, the selection of ozone generator should give priority to the following factors: high-frequency high-voltage discharge, quartz dielectric tube structure, water cooling, oxygen type, closed type.
How much does an ozone generator cost
The price of an ozone generator on the market ranges from more than a hundred dollars for a small general ozone generator to a few thousand dollars for a large one to tens of thousands of dollars for professional pharmaceutical and medical instruments.
Choose the ozone generator to determine the use of its purpose, is used for air sterilization deodorization also used for water treatment. For air treatment, you can choose a low concentration of economic open ozone generator, which includes open and open air source without gas source two of the best selection of gas source model. This type of ozone generator structure is simple and inexpensive, but the working temperature and humidity affect the amount of ozone generation.
The above open-type ozone generator is the simplest ozone device, for the high requirements of the place of air treatment should also choose a high concentration of ozone generator. Air treatment according to 20-50mg/m3 standard put, the food and drug industry to choose a high value. Can be converted according to the size of the space that is the total amount of ozone (i.e., ozone generator output).
Water treatment must be used for the purchase of high-concentration ozone generator (ozone concentration greater than 12mg / L), the low concentration of ozone treatment of water is ineffective. High-concentration ozone generator for the standard configuration with gas source and gas source treatment device and ozone generation device. Small can be designed as a one-piece model output between 5-200g / h, large and medium-sized ozone generators are basically in the form of units. Ozone generator quality can be identified from the manufacturing materials, system configuration, cooling mode, operating frequency, control mode, ozone concentration, gas source and power consumption indicators and other aspects.
Quality ozone generator should be high dielectric material manufacturing, standard configuration (including gas source and purification device), double electrode cooling, high-frequency drive, intelligent control, high ozone concentration output, low power consumption and low gas consumption.