JPH0859211A - Ozonizer - Google Patents

Abstract

PURPOSE: To prevent penetration of moisture into an ozone generating device by setting a humidity sensor in a dry air supplying pipeline and changing supplied air to a by-pass pipeline when the humidity rises in an ozonizer for forming ozone from oxygen in dry air. CONSTITUTION: A route of a three-way valve 15a is opened to an inlet side of an ozone generating device 8 when dry air supplied from a dry air supplying device is passed through a filter 7 and satisfies the prescribed values of a thermometer 13 and a dew-point hygrometer 12. The three-way valves 15a and 15b are changed so as to pass air to the by-pass piping 16 when the dry air does not satisfy the prescribed values of the thermometer 13 and the dew-point hygrometer 12 to provide the objective ozonizer for preventing penetration of humid air into an ozone generating device and having extremely high reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator which uses air as a raw material and compresses and dehumidifies the air to generate ozone.

[0002]

2. Description of the Related Art A conventional ozone generator will be described with reference to FIG. As shown in the figure, the discharge air pressurized by the main blower 1 and having a high temperature is sent to the cooler 3 and heat-exchanged with external cooling water (not shown) to have a low temperature. It is discharged from the bypass valve 2. Then, the water that has been primarily dehumidified by the refrigeration type air dryer 4 is drained from the auto drain 14. The dehumidified air passes through the switching valve 5a and enters the adsorption cylinder 6a, and the adsorbent contained therein further removes water. Then, the dry air dehumidified by the adsorption cylinder 6 a flows to the ozone generator 8 through the filter 7 (with a dew point of −60 ° C. or lower). At that time, the pressure is adjusted to a predetermined pressure by the adjusting valve 11. Air containing ozone in the ozone generator 8 flows to an ozone reaction tank (not shown).

On the other hand, a part of the dry air that has flowed out of the switching valve 5b enters the heater 9 through the adjusting valve 10 and is heated, enters the adsorption cylinder 6b through the other passage of the switching valve 5b, and enters the adsorbent. The adsorbed water is desorbed and discharged to the outside through the other passage of the switching valve 5a. Heating is done for a certain time,
When the thermal desorption progresses to the lower part of the adsorption cylinder 6b, the heater 9 is turned off and only a part of the dry air is flowed to perform the cooling. Such a heating regeneration method is repeated with a cycle of 8 hours.

When an abnormality occurs in the dry air manufacturing process in such a system, for example, when the auto drain 14 is clogged and cannot be drained, a large amount of water enters the adsorption cylinder 6a, the adsorbent is overloaded, and the dew point is high. (-60
Air will be sent to the ozone generator 8. At this time, the internal components of the ozone generator 8 deteriorate due to this humidity.

By the way, the ozone generator 8 is constructed as shown in FIG. That is, by the two partition walls 31 and 32 provided in the container 30, two left and right empty chambers 3 are provided.
3, 34 are formed. A raw material gas inlet 35 is formed in one chamber 33, and an ozonized air outlet 36 is formed in the other chamber 34. In addition, both partition walls 31, 32
A cylindrical metal pipe (stainless steel pipe) 37 that serves as a ground electrode is connected so as to penetrate through, and a vacant chamber 38 is formed. The vacant chamber 38 is provided with a cooling water inlet 39 at the bottom and a cooling water outlet 40 at the top. In addition, a cylindrical glass discharge tube 41 is concentrically inserted into the cylindrical metal tube 37 by a spacer. A conductive coating 42 is formed on the inner surface of the discharge tube 41, a conductor 44 is attached to the center of the conductive contact 43 of the coating 42, and the conductor 44 is attached to the outside of the container via a bushing 45 for insulation. Is connected to a power source (not shown). Ozone is generated by discharge from the air passing between the cylindrical metal tube 37 and the discharge tube 41. Usually, a plurality of combinations of the ground electrode (cylindrical metal tube) 37 and the discharge tube 41 are configured.

As a material for the ozone generator 8, ozone resistant materials such as stainless steel, glass, ceramics, polyvinyl chloride, and fluorine resin are used. Also, under dry conditions, some materials such as iron and aluminum are used. Further, carbon paint or aluminum sprayed film is used as the conductive film of the discharge tube 41.

In the ozone generator 8 having the above-mentioned structure, NOx is generated by discharge and the NOx reacts with water to form nitric acid, which causes corrosion deterioration and stains of internal parts. As means for detecting dirt and dirt at an early stage and stopping discharge of the ozone generator 8, an auto drain contact type 14 and a dew point contact type 12 are provided.

Further, in order to prevent an accident in which the sequence circuit such as the mutual switching of the adsorption cylinders fails, the heated air enters the ozone generator 8 and damages the parts, a system with a thermometer contact 13 is provided to stop the system. And so on.

However, when the system is stopped by such means, the faulty part is repaired, and the system is restarted, the system is connected only by the piping of one system, and even if dry air flows at the beginning of the system restart. ,
The inner wall of the pipe and the air passage in the device contain moisture, and the moisture on the wall surface is gradually taken into the dry air by the dry air, and the wall surface becomes dry. During this time, the air flowing through the ozone generator 8 has a low degree of dryness.

Therefore, conventionally, it is considered that the equipment will not be damaged or corroded if the humidification air passes through the ozone generator and the discharge is started after the interior is sufficiently dried. Was there. But it turned out to be false. For example, from a cylindrical metal tube by discharge,
Fine metal particles (iron, nickel, chromium, etc.) are popping out, and they are fluffy with powder in dry air, but once exposed to air, they become hydroxides and accumulate in narrow gaps. After that, if you touch it with sufficiently dry air, the water will fly and it will become a solid lump that will adhere to the surface of the component, polluting the discharge surface of the discharge tube, causing performance degradation, corroding the metal film on the inner surface of the discharge tube, and Fixed in the gap between the cylindrical tube and
There have been problems such as making it difficult to take out the discharge tube.
From the above, it means that moist air should not be introduced into the ozone generator 8.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide an extremely reliable ozone generator in which moisture does not enter the ozone generator. .

[0012]

In order to achieve the above object, an ozone generator according to claim 1 of the present invention is an ozone generator for generating ozone from oxygen in dry air supplied from a dry air supply device. In an ozone generator having
A sensor for measuring the humidity of the dry air supplied from the dry air supply device, provided between the dry air supply device and the ozone generator, the humidity of the dry air measured by the sensor is less than or equal to a predetermined value. In this case, the dry air is supplied to the supply line to the ozone generator, and when the predetermined value is exceeded, a switching valve for switching to the bypass line side to the ozone generator is provided.

[0013]

According to the ozone generator of the present invention, when the air that has been compressed, cooled, and dried and has been dust-removed by the filter satisfies the specified dryness and is below the specified temperature, the three-way valve provided at the filter outlet By switching the air flow to the ozone generator side. When the prescribed dryness is not satisfied or the temperature is equal to or higher than the prescribed temperature, air is flowed to the bypass pipe side by switching the three-way valve provided at the filter outlet. In this way, no moist air flows in the ozone generator, so that problems such as corrosion deterioration and damage of the ozone generator can be completely prevented.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a system diagram of one embodiment of the present invention. The present embodiment is different from the conventional example of FIG. 3 already described in the downstream side of the filter, and other configurations are the same. Are denoted by the same reference numerals and description thereof will be omitted. In FIG. 1, a three-way switching valve 15a is connected to the outlet side of the filter 7, and one of the air outlets of the three-way switching valve 15a is connected to a bypass pipe 16 and the other is connected to a pipe 17. . The pipe 17 is connected to the ozone generator 8, and its outlet side is connected to one end of the three-way switching valve 15b via the adjusting valve 11 and the pipe 18. The other side of the bypass pipe 16 is connected to the other end of the three-way switching valve 15b.
The air or ozonized air that has passed through the three-way switching valve 15b is
It leads to an ozone reaction tank (not shown).

Next, the operation of this embodiment will be described.
When the air that has passed through the filter 7 satisfies the specified values of the thermometer 13 and the dew point meter 12, the passage of the three-way switching valve 15a is switched to the direction of passing air to the inlet side of the ozone generator 8. Similarly, the outlet of the ozone generator 8 and the passage of the three-way switching valve 15b are switched. However, when the air that has passed through the filter 7 does not satisfy the specified values of the thermometer 13 and the dew point meter 12, the three-way switching valves 15a and 15b are switched to allow the air to flow to the bypass pipe 16 side.

As described above, when the air is not suitable as the inflowing air to the ozone generator 8 at the temperature and the dew point, the air flows through the circuit on the side of the bypass pipe 16 and the air flows through the ozone generator 8. There is no. Therefore, it is possible to completely prevent problems (corrosion deterioration, damage) due to the entry of humid air into the ozone generator 8.

FIG. 2 is a system diagram of another embodiment (corresponding to claim 2) of the present invention. The present embodiment is different from the embodiment of FIG. 1 described above in that it is provided with two ozone generators, and other configurations are the same. The description is omitted. As shown in FIG. 2, three-way switching valves 20a and 20b are connected to the inlet sides of the ozone generators 8a and 8b, and two-way valves are connected to the outlet sides of the ozone generators 8a and 8b via adjusting valves 11a and 11b. Valve 19
Two-way valves 19a, 19b connected to the inlet side of a, 19b
The outlet side of is connected to the pipes 18a and 18b. The other of the three-way switching valves 20a and 20b is connected to the bypass pipes 16a and 16b. Then, when the three-way switching valves 20a, 20b are switched to the bypass pipes 16a, 16b, the two-way valves 19a, 19b are closed, and the air passing through the bypass pipes 16a, 16b is released to the atmosphere. .

For example, if air is passed through the ozone generator 8a side to generate ozone, and if the air passed through the bypass pipe 16b is put into the pipe 18a side, the concentration of ozonized air sent to the reaction tank changes. Since the ozone reaction performance is adversely affected, the bypass pipes 16a and 16b are collectively discharged to the atmosphere.

[0019]

As described above, according to the present invention,
When the air as a raw material is not suitable for the inflow air to the ozone generator at the temperature and dew point, it flows through the bypass pipe of the ozone generator and does not flow inside the ozone generator, so it is damp. It is possible to completely prevent problems such as corrosion deterioration and damage of the ozone generator due to the entry of air.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention.

FIG. 2 is a system diagram of another embodiment of the present invention.

FIG. 3 is a system diagram of a conventional ozone generator.

FIG. 4 is a sectional view of a conventional ozone generator.

[Explanation of symbols]

1 ... Blower, 2 ... Bypass valve, 3 ... Cooler, 4 ... Air dryer, 5a, 5b, 15a, 15b, 20a, 20b
... 3-way switching valve, 6a, 6b ... Adsorption cylinder, 7 ... Filter,
8, 8a, 8b ... Ozone generator, 9 ... Heater, 10, 1
1, 11a, 11b ... Regulator valve, 12 ... With dew point contact, 1
3 ... With thermometer contact, 14 ... With old drain contact, 19
a, 19b ... 2-way switching valve, 16, 16a, 16b ... Bypass piping, 17, 17a, 17b, 18, 18a, 1
8b ... Piping, 30 ... Container, 31,32 ... Partition, 33,3
4, 38 ... Vacancy, 35 ... Gas inlet, 36 ... Ozone air outlet, 37 ... Cylindrical metal tube, 39 ... Cooling water inlet, 40 ... Cooling water outlet, 41 ... Discharge tube, 42 ... Conductive coating, 43 ... Conductive contact Child, 44 ... Conductor, 45 ... Bushing.

Claims (1)

[Claims] 1. An ozone generator having an ozone generator that generates ozone from oxygen in the dry air supplied from the dry air supply device, and a sensor for measuring the humidity of the dry air supplied from the dry air supply device. And provided between the dry air supply device and the ozone generator,
If the humidity of the dry air measured by the sensor is less than or equal to the predetermined value, this dry air is supplied to the supply line to the ozone generator, and if it exceeds the predetermined value, it is switched to the bypass line side to the ozone generator. An ozone generator comprising a switching valve.