What Is an Ozone Generator?

The ozone generator is a device for preparing ozone gas (O ₃ ). Ozone is easy to decompose and cannot be stored. It needs to be prepared on-site for use (under special circumstances, it can be stored for a short time), so ozone generators should be used wherever ozone can be used. Ozone generators are widely used in drinking water, sewage, industrial oxidation, food processing and preservation, pharmaceutical synthesis, and space sterilization. The ozone gas generated by the ozone generator can be directly used, or it can be mixed with the liquid to participate in the reaction.

How to get

The use of high-voltage ionization (or chemical or photochemical reactions) to decompose and polymerize part of the oxygen in the air into ozone is an allotropic transformation process of oxygen; it can also be obtained by electrolytic water method. The instability of ozone makes it difficult to achieve bottled storage. Generally, only ozone generators can be used for on-site production and used with production. The classification of ozone generators is divided according to the way ozone is generated. There are three main types of ozone generators: one is a high-pressure discharge type, the other is an ultraviolet irradiation type, and the third is an electrolytic type.

The working principle of ozone generators is divided according to the way ozone is generated. There are three main types of ozone generators: high-pressure discharge, ultraviolet irradiation, and electrolytic.

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, thereby producing ozone. This ozone generator has the advantages of mature technology, stable work, long service life, and large ozone output (up to 1Kg / h per unit), so it is the most widely used ozone generator in related industries at home and abroad. In the high-pressure discharge type ozone generator, it is divided into the following types:

1. According to the generator's high-voltage electrical frequency, there are three types: power frequency (50-60Hz), intermediate frequency (400-1000Hz) and high frequency (> 1000Hz). Power frequency generators have basically withdrawn from the market due to their large size and high power consumption. Medium- and high-frequency generators have the advantages of small size, low power consumption, and large ozone production. They are the most commonly used products now.

2. According to the gas materials used, there are two types: oxygen and air. The oxygen type is usually supplied by an oxygen cylinder or an oxygen generator. Air type usually uses clean and dry compressed air as raw material. Because ozone is produced by oxygen, and the content of oxygen in the air is only 21%, the ozone concentration produced by the air-type generator is relatively low, and the purity of the oxygen in the bottled or oxygen generator is above 90%, so the oxygen type The ozone concentration of the generator is high.

3. According to the cooling method, there are water cooling type and air cooling type. The ozone generator generates a lot of heat when it is working, and it needs to be cooled, otherwise the ozone will be decomposed while being generated due to the 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 the ozone attenuation is obvious. High-performance ozone generators with stable overall performance are usually water-cooled. Air cooling is generally only used for low-to-medium ozone generators with small ozone production. When selecting generators, water-cooled ones should be used as much as possible.

4. Divided by dielectric materials, common ones

1 discharge ozone generator

In order to improve the discharge conditions and improve the discharge efficiency, people have studied different types of electrodes such as wire, brush, spiral, mesh, and water. And the discharge forms are limited to silent, pulsed stream injection, corona, creeping, silent-creeping, and glow discharge ^[1]

Product Standards

The ozone generator should be designed and manufactured in strict accordance with the following standards:

"Ozone Generator for Water Treatment" CJ / T322-2010 People's Republic of China Urban Construction Industry Standard, replacing "Ozone Generator" CJ / T 3028.1-1994 and CJ / T 3028.2-1994 "Ozone Generator Ozone Concentration, Production, Electricity Measurement of consumption

Technical Requirements for Environmental Protection Products Ozone Generator HJ / T 264-2006 General Administration of Environmental Protection

Engineering Standard

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1. Install the device in a dry and spacious place to facilitate heat dissipation and maintenance;

2. Ensure that the electricity, gas, and water inlet and outlet pipelines are connected properly;

3. The capacity of the used line is in compliance with the requirements to ensure that the fire hazard is eliminated;

4. Danger of high pressure. Do not wash the equipment with water.

5, can not be placed near the substation.

6. Stay away from high-voltage lines.

7, the ground should not be wet

8. The equipment should have a certain space from the surroundings (300mm)

There is a national standard; the environmental protection industry standard HJ / T264-2006 of the People's Republic of China can refer to the ozone generator

1. Ozone generator installers must undergo technical training to start up and repair;

2. When using an ozone machine for sterilization, it is strictly forbidden for workers to work and work in a high concentration ozone environment;

3. Keep in mind that when the equipment is maintained or repaired, the power is cut off and the ozone is deflated, which can ensure the safety of personnel.

4. If there is any abnormality, please cut off the power immediately or notify the professional personnel for maintenance.

5. Qualified special grounding wire, safe and reliable grounding. It is forbidden to install in the place where ammonia gas is easy to leak or there is danger of explosion.

When the ozone generator is used in water treatment engineering and other occasions, there are many factors that may affect the efficiency and reliability of the generator. Therefore, the following issues must be paid attention to when designing the ozone generator application system:

The raw material gas of the thallium generator must not contain hydrocarbons, corrosive gases and any other substances that can react in the oxygen / ozone / corona environment, thereby causing harm or damage to the equipment safety.

As we all know, the three elements of the explosion are fuel, oxidant and flame, and two of them already exist in the corona environment of the ozone generator, namely oxidant and flame. Therefore, it is necessary to prevent the inclusion of hydrocarbon fuels in the feed gas; if there is a possibility of the presence of hydrocarbons, a hydrocarbon analyzer must be installed in order to cut off the power when the hydrocarbon concentration approaches 25% of the lower explosive limit (LEl).

Fluorocarbons, such as Teflon or coolants, can decompose in the corona to form fluorine, which can attack glass dielectric materials and accelerate dielectric damage. The circulating cooling fluid surrounding the outer surface of the corona may leak through the seal and enter the corona space. As a result, a layer of paint and coating is formed on the surface of the dielectric body. When this happens, the dielectric must be cleaned regularly because this coating reduces the efficiency of ozone production.

In addition, the raw material gas should also be filtered to remove particles about 5 m to prevent small desiccant powder or other particles from entering the corona area of the generator. So as not to affect the corona efficiency.

The gas supply pressure cannot be changed uncontrollably. Because the air pressure affects the corona power induction and the voltage applied across the dielectric body, a large range of pressure changes will make the generator operation unreliable. Exceeding the corona power range can cause fuses or automatic circuit breakers to disconnect. Exceeding the peak value of the applied voltage can also cause premature dielectric failure.

(3) When designing the ozone generator system, a large amount of water must be prevented from entering the generator.

The blockage of the float valve for the water-sealed air compressor or the condensate valve on the air dryer will cause the generator to be filled with water in the corona chamber. A large amount of water in the corona chamber can cause corona concentration, high current density, and local dielectric heating, causing premature dielectric failure. Even if the detection device cuts off the corona power supply before the water enters the corona chamber, impurities contained in the water will be deposited on the surface of the components, and these impurities must be removed before continuing operation. Operation failure or operation error can force the treated water from the ozone contact tank to flow into the generator, at least causing pollution of the corona element or damage to the dielectric body. In addition, system design and operating procedures must prevent flammable, corrosive gases and water vapor returning from the ozone contact cell from entering the generator.

The quality of the cooling water should be good to prevent scaling, so as not to affect the heat dissipation effect of the generator.

Two pairs of water-cooled generators say that in order to minimize scaling on the heat transfer surface, the water quality of the cooling water is very important. Fouling can reduce heat transfer efficiency, reduce ozone production, and increase maintenance costs. Technically, tap water is the preferred coolant. However, tap water is economically unattractive for the water consumption required by large industrial generators, except perhaps when the system is used in a water treatment plant. Contrary to the quality of tap water, the treated sewage is generally not effective as cooling water because it is prone to scaling. If high-quality water or other fluids are used in the sealed ten-time cooling circuit, the final heat exchanger is specifically designed to minimize scaling; and it is easy to clean, and the sewage effluent can also be used as final heat dissipation. In order to achieve the best balance between water costs and equipment maintenance costs, most of the system design uses cooling tower water or heat exchanger quality drinking water (no suspended solids, chloride <5mg / L).

For air-cooled generators, the cooling air must be free of moisture, impurities, corrosives, aerosols, oily or conductive materials, and visible dust. Under normal circumstances, unless in an extremely dusty industrial atmosphere, most of the air does not need to be filtered.

working principle

The ozone generator uses advanced physical oxygen production principles, and through the pressure swing adsorption of the oxygen production tower, directly separates oxygen and nitrogen in the air at normal temperature and pressure to obtain high-purity oxygen; Under normal pressure, the oxygen-containing gas is caused to generate a corona discharge under the action of an alternating high-voltage electric field to generate ozone; after mixing water and ozone through a gas-liquid mixing system, a certain concentration of ozone water is obtained.

Scope of application

Public canteens such as schools, troops, agencies, and factories sterilize vegetables, fruits, and meat, and reduce pesticide residues. Drinking water plants, food plants, pharmaceutical plants, cosmetics plants, aquaculture farms, sewage treatment plants and swimming pools, warehouses, community water supply, etc. are sterilized with ozone water.

The main purpose

Sterilize and disinfect vegetables, fruits, and meat foods to reduce pesticide residues;

Disinfection and preservation of mineral water, purified water, medical water and tap water;

Sterilize the aquaculture water and prevent aquatic diseases;

Disinfection and decolorization of sewage; disinfection and purification of swimming pool water;

Packaging disinfection, environmental disinfection, air purification, chemical synthesis, material modification, etc.

Features

1. Beautiful and elegant, high corrosion resistance;

2. The pipeline adopts sanitary stainless steel pipe fittings, which are resistant to pressure and corrosion;

3. Computer-type display. Adopting thin-film control panel design and digital display, beautiful appearance and simple operation;

4. The purity of oxygen obtained from the preparation of ozone is above 90%

5. Use high concentration and high efficiency ozone generator;

6. High ozone utilization rate, can reach more than 80%;

7. With ozone water and gas separation, ensure that the residual concentration of ozone water exit meets national standards;

8. With electrical safety protection;

Process flow

The process of obtaining ozone disinfection water is as follows:

Air Oxygen making system Ozone generating system

Water source Gas-liquid mixing system Ozone water

120kg / h large ozone generator and its series of products can be widely used in municipal drinking water treatment, sewage treatment, industrial wastewater treatment, flue gas denitration, pulp bleaching, fine chemical oxidation and other fields. Drinking water safety, environmental protection, energy saving and emission reduction, etc. are important development directions of transformation, structure adjustment. It is also a major technology and equipment that China faces in the application of environmental protection engineering and can replace imports.