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Precautions for the application of ozone generator in water treatment
1. The raw material gas of the ozone generator must be clean
The raw material gas must not contain hydrocarbons, corrosive gases, and all other gases that can react in the oxygen/ozone/corona discharge environment, and then adversely affect or destroy the safety of the equipment.
Everyone knows that the three basic elements of an explosion are fuel, oxidizer and fire, and there are already two items in the corona discharge environment of the ozone generator, namely, oxidizer and fire. Therefore, it is necessary to avoid hydrocarbon fuel chemicals in the feed gas; if there will be hydrocarbon chemicals, be sure to install a hydrocarbon analyzer to facilitate when the hydrocarbon concentration is close to 25% of the lower explosive limit (LEl) Connect the switching power supply. Fluorocarbons such as Teflon or coolant can be decomposed in corona discharge to produce fluorine, which can corrode the glass dielectric material and accelerate the destruction of the dielectric. The radiating fluid of the circulating system surrounding the corona discharge chamber may leak and enter the corona discharge space due to its tightness. As a result, a layer of lacquer or coating is produced on the surface of the dielectric body. When this type of situation occurs, because this type of coating reduces the efficiency of ozone production, the dielectric must be cleaned regularly. In addition, the raw material gas should also filter out about 5μm particles to prevent small moisture-proof powder or other particles from entering the corona discharge area of the generator. To prevent interference with corona discharge efficiency.
2. The operating pressure of the ozone generator should be stable
The working pressure of the air supply cannot be changed uncontrollably, because the air pressure interferes with the corona discharge output power induction and the working voltage applied across the dielectric, and large-scale working pressure changes will make the generator operation unsafe and reliable. Exceeding the corona discharge output power range can cause the high-voltage fuse or automatic breaker to disconnect. Exceeding the peak value of the applied working voltage can also cause premature failure of the dielectric body.
3. Avoid getting water into the ozone generator
The float valve used in the water-sealed air supply compressor or the condensate valve on the air dryer is blocked and jammed, which causes the corona discharge chamber of the generator to be filled with water. A large amount of water seepage in the corona discharge chamber can cause the corona discharge to be concentrated, high current intensity and local dielectric heating, causing premature failure of the dielectric. Even if the test equipment is disconnected from the corona discharge switching power supply before the water enters the corona discharge chamber, the impurities contained in the water will accumulate on the surface of the components, which must be eliminated before running again. Common operation failures or actual operation problems can prompt the disposal of overflowing water from the ozone contact pool to the generator, and rarely cause corona discharge components or dielectric destruction. In addition, the control system design and safety operating procedures must prevent flammable corrosive gases and water vapor returning from the ozone contact pool from entering the generator.
4. The cooling water of the ozone generator cannot be scaled
Scaling of ozone cooling water will reduce heat transfer efficiency, thereby reducing ozone production and increasing maintenance costs. Technically, tap water is the first coolant of choice. However, in terms of the water demand necessary for large and medium-sized industrial-grade generators, the choice of tap water is not economically attractive at all. Perhaps only the system is used in the water treatment station. outside. Compared with the tap water environment, generally treated sewage is used as cooling water, and the effect is not very good, because it is easy to cause scaling. Once high-quality water or other fluids are used in the sealed ten-pass water cooling circuit, the final heat exchanger is also specially designed to minimize fouling; it is conducive to cleaning, and the sewage effluent can also be used as the final heat dissipation option. . In order to have a good and stable balance between water and electricity costs and equipment maintenance costs, most of the control system design uses cooling tower water or heat exchanger high-quality drinking water (no suspended solids, chloride <5mg/L ).