JPH07232904A - Ozone generator - Google Patents

Abstract

PURPOSE:To shorten the period required for the maintenance and inspection of the ozonizer and to reduce the starting time of the suspended ozonizer by providing a raw gas cooler, a raw gas drier and a means for sucking out the gas in the devices of the ozonizer. CONSTITUTION:The air in the atmosphere with the dust removed by a filter 1 is passed by a blower 2 under pressure through an air cooler 4 and an air drier 6 to form clean dry air having a low dew point of <=-60 deg.C which is introduced into an ozonizer 8. An AC discharge is generated in the ozonizer between the electrodes arranged on both sides of several hundred glass, lines and the clean dry air is passed through the discharge space to generate ozone. The blower 2 and the ozonizer 8 are communicated through pipelines 3, 5 and 7. Valves 3A, 5A and 7A are provided on the respective pipelines and used as a means to separate the gas circuit between the devices. The ozone left after ozonization is collected in a pipeline 12, recoverted to ozone by the active carbon or catalyst in a waste ozone treating tower 13 and safely discharged by a fan 14.

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 is applied to the purification treatment of sewage and sewage using the oxidizing power of ozone, and the water sterilization treatment of a pool and a cooling device.

[0002]

2. Description of the Related Art Ozone treatment apparatuses for purifying water by utilizing the oxidizing power of ozone have been applied to many fields including water purification plants. For example, there is water purification treatment using ozone, which is disclosed in JP-A-61-186205. The operation will be described by simplifying the water purification process. The air in the atmosphere is dust-removed by a filter and pressure-fed by a blower, and becomes clean and dry air with a low dew point (-60 ° C or lower) through an air cooler and an air dryer, and is guided to an ozone generator.

Although not shown, the interior of the ozone generator is subjected to AC discharge between electrodes arranged on both sides of the glass, and ozone is generated by flowing clean and dry air into the discharge space. At the time of ozone water purification treatment, air containing ozone is made into fine bubbles from a pipe through an air diffuser, and ozone is brought into contact with water flowing in the ozone contact tank. The ozone remaining after the ozone treatment is collected by a pipe, returned to oxygen by the action of activated carbon or a catalyst in the exhaust ozone treatment tower, and safely exhausted by the fan. Such a processing device is generically called an ozone generator.

[0004]

In order to generate ozone stably, it is necessary to supply clean and low dew point raw material air to maintain stable discharge inside the ozone generator. For this reason, usually, every year, the discharge part inside the ozone generator is dismantled and cleaned, and regular maintenance and inspection is also performed on each device.
At this time, be careful not to mix dust and humidity inside, and pay close attention to the replacement of internal air, drying, conditioning of the discharge part, etc. even during the equipment startup test run after inspection. It takes about 1 to carry out the work and maintain one unit.
It takes about a week. Therefore, during this time, the device is stopped,
Processing capacity is reduced.

On the other hand, after the ozone generator is stopped during normal operation other than inspection, the dry condition of the internal air is lowered. Therefore, the air dryer 4 is operated prior to the operation of the ozone generator, and the dry air is dried. Need to prepare the supply posture of
For this reason, about 8 hours of preparatory operation is required.

An object of the present invention is to provide an ozone generator which shortens the maintenance and inspection work period of the ozone generator and shortens the operation start time of the operation stop device.

[0007]

The ozone generator of the present invention is provided with means for sucking and discharging the gas inside each device such as a raw material gas cooler, a raw material gas dryer, and an ozone generator.

[0008]

[Operation] After dismantling, inspecting, and cleaning each device of the ozone generator, impurities such as dust and water stagnation in each device are sucked and discharged to the outside by the exhaust means, so that maintenance work for exhausting impurities is performed. Significantly shortened the start-up and restart of the test operation.

[0009]

Embodiments of the present invention will be described below with reference to the ozone treatment apparatus shown in FIG.

The air in the atmosphere dedusted by the filter 1 is pressure-fed by the blower 2, passes through the air cooler 4 and the air dryer 6, and becomes clean air having a low dew point (-60 ° C. or less) and ozone. It is led to the generator 8. Although not shown, the inside of the ozone generator is subjected to AC discharge between electrodes arranged on both sides of several hundreds of glasses, and ozone is generated by flowing clean and dry air into the discharge space. . The blower 2 and the ozone generator 8 are communicated with each other through pipes 3, 5, and 7. Valves 3A, 5A, and 7A are provided in each pipe to serve as a means for separating a gas circuit between each device.

During the ozone water purification treatment, the ozone generator 8 communicates with the diffuser pipe 10 of the ozone contact tank 11 through the pipe 9 having the valve 9A, and the ozone-containing air from the ozone generator 8 is fed from the pipe 9. Through the air diffuser 10 to form fine bubbles,
Ozone is brought into contact with water flowing in the ozone contact tank 11. The ozone remaining after the ozone treatment is collected through the pipe 12, is returned to oxygen by the action of activated carbon or a catalyst in the exhaust ozone treatment tower 13, and is safely exhausted by the fan 14.

The exhaust device 24 and the clean gas supply device 25 are connected to each other through the pipe 27 by the pipes 3, 5, 7, and 9. A pipe 27 communicating with each of the pipes 3, 5, 7, 9 is provided with valves 3B, 5B, 7B, 22, 23, and the gas in each device is exhausted by an exhaust device 24. The gas is supplied from the clean gas supply device 25 to the pipes 3, 5, and 7 via the pipe 27.

When carrying out maintenance work with this ozone generator, after disassembling the air cooler 4, the air dryer 6 and the ozone generator 8, after inspecting and cleaning them, reassembling them and then operating the exhaust device 24. Dust, moisture, etc. mixed in the ozone generator or adsorbed on the inner wall of the device is quickly sucked and exhausted by the exhaust device 24 (internal pressure is several mmHg or less), so the maintenance work required for removing dust, moisture, etc. It was possible to shorten the start-up operation time.

Further, when the ozone generator is not operated immediately after the exhaust maintenance work, by filling, for example, clean dry air with a low dew point from the clean gas supply device 25 as proposed in Japanese Patent Laid-Open No. 31303/1992, It is possible to prevent moisture or to easily start the trial run of the ozone generator. Ozone generator 8 that requires a particularly low dew point
In this, the discharge conditioning work is facilitated, the possibility of damaging the discharge part that may be caused by the impure gas is significantly reduced, and the device startup time to the rated performance can be performed in a short time. Valve 3A-9
By the operations of A and 3B to 9B, each device is individually exhausted and filled with gas, and each device can be kept in a clean state even when not working.

FIG. 2 shows an embodiment of exhaust and gas filling control. Exhaust in the exhaust device 24 and clean gas supply device 25.
The gas pressure detector 4 provided in the air cooler 4, the air dryer 6, and the ozone generator 8 is used to control the gas filling in
C, 6C, 8C are taken into the control unit 30, and when exhausting, the pressure is exhausted to a preset pressure, or the valves in the control unit 30 are controlled to exhaust for a preset time by a timer function. Filling each device with gas
The control is performed by the control unit 30 that supplies gas up to a preset pressure.

FIG. 3 shows an example of a system in which a plurality of ozone generators are operated in parallel. In this case, the exhaust device 24,
An example is shown in which the clean gas supply device 25 is prepared and shared in the system. Other effects in this embodiment are as follows.

Ozone generators 20-1, 20-2, 20
-3, when the ozone generator 20-3 is suspended depending on the load state, the ozone generator 20-3 can be always put in the standby state by filling the ozone generator 20-3 with clean and dry gas. it can. Especially in the air dryer 6, when the moisture adsorbent for drying adsorbs moisture, a preliminary operation of about 8 hours is required until sufficient dry air is generated to generate ozone. At present, the air dryer 6 must be in an operating state in order to keep the resting machine in the hot standby state, which is not preferable in terms of energy saving. According to this embodiment, the ozone generator 8
Can keep the inside dry even when it is not in operation, and can start the operation of the device immediately when necessary.

[0018]

The effects of the present invention are as follows.

(1) The exhaust work after the disassembly inspection of the ozone generator is significantly shortened, and the startup operation time can be shortened. Further, damage to the electrode portion due to abnormal discharge that may occur in a dirty atmosphere is eliminated, and inspection work time is shortened and work reliability is improved. As a result, the inspection cost can be reduced and the operation rate of the device can be improved.

(2) At the time of starting the suspension device, it is no longer necessary to prepare the air dryer for about 8 hours, which is conventionally required. As a result, for example, in ozone treatment in a water purification plant or the like, the responsiveness of control of the number of operating units that supplies a necessary ozone amount to a load change such as a rapid water quality change or a treated water amount change is improved.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of an ozone generator shown as an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of an ozone generator shown as another embodiment of the present invention.

FIG. 3 is a schematic explanatory diagram of an ozone generator shown as another embodiment of the present invention.

[Explanation of symbols]

3, 5, 7, 9, 12 ... Piping, 4 ... Air cooler, 6 ... Air dryer, 8 ... Ozone generator, 10 ... Air diffuser, 11 ... Ozone contact tank, 13 ... Waste ozone treatment tower, 24 ... Vacuum exhaust device, 25 ... Clean gas supply device, 20-1, 20-2, 2
0-3 ... Ozone generator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeo Shiono 1-1-1 Kokubuncho, Hitachi City, Ibaraki Hitachi Kokubun Plant, Hitachi Ltd.

Claims (4)

[Claims] 1. An apparatus for forming a raw material gas cooler, a raw material gas dryer, and an ozone generator, which comprises an ozone generating apparatus, further comprising means for sucking and discharging the gas inside each of the apparatus. . 2. The ozone generator according to claim 1, further comprising means for separating the respective devices. 3. A plurality of ozone generators are installed, and a means for exhausting the internal gas of the plurality of ozone generators is prepared in a smaller number than the ozone generators and shared by the plurality of ozone generators. The ozone generator according to claim 1, characterized in that. 4. A means for remotely controlling the gas discharging means inside the ozone generator and a means for measuring the gas pressure inside each device are provided, and the gas is selectively sucked and discharged from each device.
The ozone generator according to any one of claims 1, 2 and 3, wherein suction and discharge are continued for a predetermined time or until a predetermined pressure is reached.