Wednesday, September 27, 2023

Why does ozone sterilization require the concentration of ozone?

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Ozone is widely used as green disinfectant, ① drinking water, industrial wastewater, domestic wastewater, swimming pool water treatment and hospital sewage treatment; ② air sterilization and disinfection of raw materials, processing equipment and locations in medicine in the food industry and pharmaceutical industry. Cleaning and disinfection; ③ storage and transport of fruit, vegetables and food; ④ ozone treatment and disease prevention in medicine; ⑤ bleaching of pulp and textiles in the chemical industry; ⑥ water treatment in aquaculture; ⑦ living space air purification Disinfection, decomposition of residual pesticides on the surface of vegetables, melons and fruits; ⑧ Air sterilization, deodorization and odor removal in livestock and poultry farms.

At present, there are three main ways to generate ozone on the market, and the industrial ozone generator is generally based on the principle of corona discharge, because the amount of ozone required is relatively large.

1. The principle of corona discharge:

2. Principle Of UV Light:

3. The principle of electrolysis of water

The principle of producing ozone by corona discharge is expressed by the formula E=U/D (E = F / q, E = KQ / r2), P=I2R, E is the electric field strength generated by static electricity , when E is greater than the air is ionized At the critical value of the field strength, the air ionization begins, that is, the air becomes a conductor and there are free electrons in it. The electrons are freed from the bonding of the nucleus, the oxygen molecules are decomposed into oxygen atoms, and the oxygen atoms are rapidly produced with oxygen. ozone.

Where does the field strength E of the electric field come from? In the stainless steel ozone tube, there are many small electrodes connected in parallel with each other and then connected to the power supply. The transformer continuously increases the 220V or 380V from the mains supply to 3000V-6000V. The power above will get bigger and bigger, and the power is Q (E = KQ / r2).

There will be a quartz tube insulation outside the electrode as insulation protection. We all know that air is not conductive under normal conditions. By constantly increasing the voltage, the electricity Q on the electrode will increase, and at the same time, this electricity Q will increase the electric field strength around the electrode. When the electric field strength formed by this electricity Q, distributed over the surface of the electrode, starts to become greater than the electric field strength of the ionized air, the air becomes ionized and can conduct electricity. There will be free electrons in the air.

These electrons come from oxygen and nitrogen molecules, so oxygen and nitrogen become oxygen and nitrogen atoms, and these oxygen atoms flow through the inside of the ozone tube. The air or oxygen reacts chemically to generate ozone, and at the same time there will be a small amount of nitrogen. Some will ask, aren’t there other gases in the air? Those are inert gases, a situation does not react, why can a corona discharge produce a lot of ozone at the same time? We can design the stainless steel ozone tube according to the gas flow, such as how many liters per minute. To increase the ozone production per hour, the ozone tube can increase the number of electrodes. There are generally two types of gases that we produce ozone, namely air and oxygen. The concentration of ozone produced by air is 18-35 grams per cubic meter and the ozone produced by oxygen is 80-120 grams per cubic meter. In the electrode discharge process, according to the P=I2R electric current, we know it will generate a lot of heat, so we need water cooling to take this heat away, if we don’t take it, it will affect the life of the machine, and the other is Will reduce the production of ozone, because the temperature rises, ozone will accelerate the decomposition.

How often does the corona discharge produce the power of the ozone machine?

A, 50-60Hz

B, 400-1000Hz

C, >1000Hz

The higher the frequency, the smaller the volume requirement of the ozone generator (the smaller the power supply), the lower the power consumption and the greater the ozone output, but the technical requirements are high.

What is the relationship between the ozone production per unit time of the ozone generator?

1. The structure and processing accuracy of the ozone generator:

2. Cooling methods and conditions

3. Driving voltage and driving frequency:

4. Dielectric material (quartz glass)

5. Oxygen content and purity and dryness in raw gas

6. Efficiency of generator power system (high efficiency, less heat conversion)

Why does ozone sterilization require ozone concentration?

The ozone sterilization detection standard is the CT value, C is the ozone concentration, T is the retention time after the ozone concentration reaches the standard, such as drinking water ozone sterilization, CT=1.6 C=0.4ppm, T=0.4 minutes, the essence of ozone sterilization in water, in fact it is the strong oxidizing power of the oxygen atoms generated by the decomposition of ozone in the water and the total amount of ozone in the water itself.

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