JP3298028B2 - Apparatus and method for generating and supplying ozone in a water purification plant - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water treatment plant,
In the water treatment process (raw water intake, sedimentation basin, filtration pond, chlorine injection pond, distribution pond), insert "ozone contact pond-activated carbon treatment pond" at any process position to remove unnecessary components for water distribution The present invention relates to an apparatus and method for generating and supplying ozone in a water purification plant for achieving efficient energy saving operation of a so-called advanced water purification treatment facility.

[0002]

2. Description of the Related Art Conventionally, as one of the improvements of water supply facilities, various studies have been conducted on the removal of unnecessary substances from raw water, and the first large-scale facility at the Kanamachi Water Purification Plant in Japan since June 1992. Is in operation. That is, it is an additional facility of “ozone contact pond by ozone generating facility to activated carbon treatment pond” (literature, pamphlet explaining Kanamachi waterworks, etc.). However, the ozone generation efficiency of the ozone generator is usually as low as about 5%, and the remaining 95% is discarded as thermal energy. Therefore, various measures for improving the generation efficiency have been promoted for the ozonation (O ₃ ) reaction of oxygen (O ₂ ) in the air based on the glow discharge principle. In particular, since the ozone contact pond in a large water purification plant has a large capacity, a required amount of ozone can be obtained by parallel operation using a plurality of ozone generators.

On the other hand, the amount of treated water is always required for the installation of a plurality of ozone generators. Therefore, in order to break down the ozone generator or stop maintenance and inspection, a spare machine must be permanently installed and emergency operation is required. It is in the standby state of the alternative operation including.

[0004] In order to increase the ozone generation efficiency of the ozone generator, the input air (O ₂ concentration 21%) is converted into an oxygen-enriched P.
93-1 The O ₂ concentration by SA device or an oxygen cylinder
It is known that when input as 00%, the ozone generation efficiency becomes 2.2 times (literature, ozone water treatment technology p.32). In this case, conventionally, the system of the input air source of the ozone generator is “blower to air cooler to dehumidifier to ozone generator” or “blower to air cooler to oxygen-enriched PSA device to ozone generator”. "

[0005] Therefore, in order to immediately perform the standby operation even when the ozone generator is in the stand-by state, the air cooler and the dehumidifier as the preceding devices must be in the operating state. The samurai period driving state is based on the principle of each device,
The air cooler is idle operation to keep the predetermined cooling temperature constant, and the dehumidifier is an idle operation of about 8 hours for one tower for alternate operation of two adsorption towers (moisture absorption and dehumidification cycle) and the ozone generator. Since the cooling system pump needs idle operation for stabilizing glow discharge, power and heat energy consumption during the samurai period operation is large.

[0006]

As described above, the prior art is configured as follows. (1) Since the amount of ozonated water in the ozone contact pond is always required, a plurality of “ozone generators and pre-stage raw material air generators (blowers to air coolers to dehumidifiers)” must be redundant. In order to reduce the downtime (stop time) of the equipment, a spare system will be installed and operated under standby operation conditions. (2) Because of the redundant system for repairs by periodic inspections for continuous operation, the system is stopped gradually and covered by the spare machine operation to enable continuous operation of the entire system. For this reason, there is a problem in that the provision of a spare machine system is expensive, and the running cost of electric power and thermal energy increases with time in order to keep the system in a standby operation state.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ozone generation and supply apparatus in a water purification plant in which a spare machine for maintenance and inspection can be omitted as an ozone generation means, hot standby can be performed, and power and heat energy can be largely saved. And a method.

[0008]

To achieve the above object, the present invention comprises the following means. The first invention includes a plurality of ozone generating means, and an ozone distribution pipe connected to the plurality of ozone generating means in parallel and supplying ozone generated to an ozone reaction tank of a water purification plant, Is an ozone generation and supply device in a water purification plant that includes an ozonizer and a dry air supply unit that sends dry air to the ozonizer, wherein a high-concentration oxygen supply unit is connected between the ozonizer and the dry air supply unit. It is assumed that.

In a second aspect of the present invention, the high-concentration oxygen supply means includes at least two or more reaction towers filled with a blower and an adsorbent for adsorbing and removing N ₂ components in the air. It is a thing.

A third aspect of the present invention is the ozone generation and supply device in the water purification plant, wherein the high-concentration oxygen supply means is an oxygen cylinder.

A fourth aspect of the present invention is the ozone generation and supply device in the water purification plant, wherein the high-concentration oxygen supply means comprises a blower and at least two or more reaction towers filled with an adsorbent for adsorbing and removing N ₂ components in the air; It is characterized by being an oxygen cylinder.

According to a fifth aspect of the present invention, there is provided the ozone generating and supplying apparatus for a water purification plant according to any one of the above, wherein a filter is provided in front of the ozonizer, and high-concentration oxygen supplying means is connected in front of the filter. I do.

According to a sixth aspect of the present invention, there is provided the ozone generation / supply device for a water purification plant according to any of the above, wherein operation / stop / failure information of the ozone generation means and operation / operation of the high-concentration oxygen supply means are provided.
A sequencer is provided which outputs a control signal for switching between a dry air flow and a high-concentration air flow using stop / pressure information as input conditions.

The seventh invention comprises a plurality of ozone generating means, and an ozone distribution pipe connected to the plurality of ozone generating means in parallel and supplying ozone generated to an ozone reaction tank of a water purification plant. The generating means includes an ozonizer and a dry air supply means for sending dry air to the ozonizer, a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means, and all of the plurality of ozone generating means are sound. This is an ozone generation and supply method in a water purification plant, wherein the high-concentration oxygen supply means is stopped during operation.

The eighth invention comprises a plurality of ozone generating means, and an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply the generated ozone to an ozone reaction tank of a water purification plant. The generating means includes an ozonizer and a dry air supply means for sending dry air to the ozonizer, and a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means to operate all of the plurality of ozone generating means. And operating the high-concentration oxygen supply means in the water purification plant.

The ninth invention comprises a plurality of ozone generating means, and an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply ozone generated to an ozone reaction tank of a water purification plant. The generation means includes an ozonizer and a dry air supply means for sending dry air to the ozonizer, a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means, and a part of the plurality of ozone generation means is provided. An ozone generation and supply method in a water purification plant, characterized in that when stopped due to a failure or maintenance, the high concentration oxygen supply means is operated to supply high concentration oxygen to the ozone generation means which is operating normally.

[0017]

The operation of the present invention is as follows. (1) When any one of the plurality of ozone generating means is stopped, any other ozone generating means of a healthy operation is selected, high concentration O ₂ is injected by high concentration oxygen supply means, and the ozone generation efficiency is obtained. Is doubled, ozone generating means as a spare machine can be omitted. In other words, in the ozone generating means composed of a plurality of units, the system for failure or inspection and repair is separated, and high-concentration oxygen is supplied to the healthy operation system side to increase the ozone generation efficiency by two times, so that the ozone generation of the entire system is increased. The amounts can be the same. As a result, the samurai period operation for hot standby of the spare machine becomes unnecessary,
Power and heat energy are saved.

(2) Since maintenance of the separately provided high-concentration oxygen supply means is performed when a plurality of ozone generation means are operating normally, the operation of the ozone generation means is not affected. Maintenance and repair are performed systematically when the ozone generating means is normal. Since the high-concentration oxygen supply means cannot be used during maintenance, it is preferable to connect the pipes separately with an oxygen cylinder for an emergency. In addition, the high-concentration oxygen supply means can usually be operated immediately, so that the samurai period operation is unnecessary.

(3) The high-concentration oxygen from the high-concentration oxygen supply means is automatically controlled by electromagnetic valves disposed in each of the supply pipes. Therefore, the output condition (each solenoid valve operation and operation ON / Off operation) is performed based on the optimal operation logic based on the input condition (various failure detection and operation state detection), that is, a so-called sequencer is used.

[0020]

An embodiment of the present invention will be described below.
In FIG. 1, an ozone generating means 1 is a pre-stage raw material air generating facility in which a blower 2 for taking raw material air, an air cooler 3 and a dehumidifying device 4 are provided.
%), Ozone (O ₃ ) gas is generated by glow discharge in the ozonizer 8 through the filter 7 and is guided to the ozone distribution pipe 15 system. In order to form a redundant system, a plurality of ozone generating means 1 are arranged in parallel. This ozone gas is guided to the ozone reaction tank 16 and diffused into the treated water 18 by the diffuser 1.
The wastewater is discharged into the water through the reactant 7 to react and remove unnecessary components in the treated water 18.

On the other hand, an oxygen-enriched PSA device 9 as a high-concentration oxygen supply means removes N ₂ components in air by using a blower 2 and two reaction towers (adsorbent filling) 10 in parallel. Only O ₂ component concentration is increased, oxygen concentration is increased to 93%,
The pressure is guided to the reservoir tank 12 by the compressor 11 and a predetermined pressure (for example, 1 to 1.2 kg / cm ^2.
G) and accumulate. At this time, the reaction column 10 of the two towers is O ₂
Enrichment, adsorbent filled because cycles operating at about one minute intervals alternately N ₂ discharge hardly exhausted. The high-concentration oxygen gas is supplied to the solenoid valve 6 (6A, 6B, 6) through the pressure regulating valve 13.
C, 6D,...) Are supplied to the input side of the filter 7 of each ozonizer 8.

The solenoid valve 6 (6A, 6B, 6C, 6D,...)
Are operated by the sequencer 14. That is,
There is software that incorporates an operation mode with the operation / stop / failure state of the ozone generation means 1 and the pressure management and operation / stop state of the oxygen-enriched PSA device 9 as input conditions. According to the operation mode determined logically, the solenoid valve 6 (6
A, 6B, 6C, 6D,...). For example, when the failure stop of the ozonizer (OZN ₁ ) 8 of the _first unit or the failure stop of the air cooler 3 or the dehumidifier 4 occurs, the solenoid valve 6B is closed, and the other sound operation system such as the second ozonizer (OZN ₂₎ ) Solenoid valve operation mode (solenoid valve 6)
(The valve 6D is opened when the C is opened or when the 6C is opened → closed.)

Of course, all the ozonizers 8 are sound and
When an auxiliary machine such as the blower 2, the air cooler 3, or the dehumidifier 4 of the unit fails, there is also an operation mode in which the solenoid valve 6A is opened and closed and the solenoid valve 6B is opened. Therefore, it is necessary to connect the piping through the pressure regulating valve 13 to the inlet side of the pre-stage filter 7 of the ozonizer 8 in parallel. It is important that the filter 7 is located at the position shown in the figure in order to prevent human error dust from entering during maintenance and repair when ozone is generated.

FIG. 2 shows one basic example of how to use the ozone generation and supply device of the present invention.
Are operated in a plurality of series. For example, if a failure F occurs in the Ozonizer (OZNn) system of the n-th unit, the sequencer 1
The command of 4 causes the oxygen-enriched PSA device 9 to start operation immediately (operation after consumption if the reservoir tank 12 has sufficiently maintained pressure). At the same time, the operation of the solenoid valve 6 causes the OZ
Since high-concentration oxygen (93%) is supplied to the N ₂ system, the amount of oxygen supplied to the ozonizer is changed from 21% to 93%, and the ozone (O ₃ ) component due to glow discharge is increased about twice. . Therefore, the operation can be continued without changing the ozone generation amount as the whole system. Meanwhile, the OZN that failed
The n. system was restored and the P.n. Although the start-up is performed at the point S, the dehumidifier 4 requires a standby operation time of about 8 hours (shown by a dotted line in FIG. 2) as described later, and then the solenoid valve switching operation is performed at the point R in FIG. Then, the oxygen-enriched PSA device 9 is stopped and the operation is restored to the ozone generation means 1 in the initial parallel operation.

In FIG. 3, the temperature (R
T) and pressure (P) are explanatory diagrams showing the relationship between
At point A ₁ , the air temperature rises by about 100 ° C. from room temperature in order to obtain a constant pressure P. While aiming to improve the efficiency of dry air next air cooler 3, to primary cooling air temperature (A ₂ points) dehumidification in the apparatus 4 (the dew point decreases), the 4 DH ₁ and DH ₂
And alternately every 8 hours (after moisture absorption and saturation to dehumidification cycle / DH with heater), apparently continuously dry air having a low dew point is removed by the filter 7 through the solenoid valve 6A by the filter 7. It is supplied to the ozonizer 8. (A ₆ points) Ozonizer 8 uses O ₂ → O ₃ by glow discharge.
The passing gas temperature rises sharply. The glow discharge is provided with power energy from the high voltage transformer 20. As is well known, a glow discharge electrode performs glow discharge between 1 to 3 mm intervals of a flat plate or a cylindrical shape, and O ₃ is generated by passing air O ₂ through the interval, but the efficiency is about 5% and other efficiency is about 5%. Is consumed as heat energy, so as to make the temperature constant, the heat exchanger 19 makes thermal equilibrium to prevent the thermal expansion and destruction of the glow discharge electrodes (the same phenomenon occurs if the dew point of the input air is not sufficiently low). ). The generated O ₃ is supplied by the pressure P at a value that overcomes the head loss of the ozone distribution piping system 15 and the treated water 18 in the ozone reaction tank 16, so that the ozone gas can be ejected from the air diffuser 17.

When the oxygen-enriched PSA device 9 is operated, the solenoid valve 6A is closed and 6B is opened.
By setting it slightly higher than A (approximately 0.2 kg / cm ² · G), the flow rate of ozone spouting into the air diffuser 17 becomes the same by the pressure regulating valve 13.

FIG. 4 is an explanatory view of the waiting operation for each operation of the conventional ozone generating means 1. Blower 2 is O
If it does N, it will rise immediately. Since the air cooler 3 is a refrigerator operation, a standby operation of the heat exchanger is required, and the ON-tc time is required. The dehumidifier 4 requires a standby operation for -t _D time (about 8 hours) in principle even in one of the two towers. The ozonizer 8 has a heat exchanger 19 for heat balance.
The (HEX) system requires a waiting period of ON-to-time. However, the high-voltage transformer 20 can be operated immediately. Here, in order to make the system a hot standby operation system, the standby operation as shown in FIG. 4 is always necessary, and the same is true even if a spare system is provided in parallel. It explains the problem to be solved by the method.

On the other hand, as described with reference to FIG. 4, in the standby operation, the dehumidifier 4 is the longest about 8 hours,
The same power and heat energy saving can be achieved by using an oxygen cylinder instead of 9 (supply capacity of about 8 hours or more).

The minimization of power and heat energy can be handled by creating software in accordance with equipment switching in the operation mode by the sequencer 14 in FIG. In the operation mode in which the solenoid valves 6A and 6B are both open, the oxygen concentration is 21% and 93%.
Are simultaneously diffused and mixed while passing through the filter, and thus are proportional to the ozone O ₃ generating ability during the passage through the ozonizer 8.

[0030]

【The invention's effect】

(1) In water purification equipment that always requires a constant amount of ozone, reliability is improved by using a system in which a plurality of ozone generating means are operated in parallel, but a spare that covers equipment downtime for failure and maintenance. Conventionally, the system must be permanently installed. According to the present invention, a spare machine system can be omitted by parallel supply of a high oxygen concentration (93% or more) to the inlet of the ozonizer by a PSA device or the like, so that the cost is reduced.

(2) Hot standby becomes possible, and waiting operation is not required, so that power and heat energy can be largely saved (reduction of running cost).

(3) Since the number of days required for maintenance and inspection of the ozone generating means can be stopped in a planned manner, no urgent inspection work is required and the burden on maintenance personnel can be greatly reduced.

(4) The automatic operation mode by the sequencer makes it possible to operate the system system at a minimum cost, and the running cost can be reduced by saving power and heat energy.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a system configuration according to the present invention.

FIG. 2 is an explanatory diagram of an example of an operation mode according to the present invention.

FIG. 3 is an explanatory diagram of temperature-pressure transition in a system.

FIG. 4 is an explanatory diagram of a standby operation state to an operation / stop mode of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ozone generation means 2 Blower 3 Air cooler 4 Dehumidifier 6 Solenoid valve 7 Filter 8 Ozonizer 9 Oxygen-enriched PSA device 10 Reaction tower 11 Compressor 12 Reservoir tank 13 Pressure regulating valve 14 Sequencer 15 Ozone distribution system 16 Ozone reaction Tank 17 Air diffuser 18 Treated water

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI C02F 1/50 540 C02F 1/50 540A 550 550D 550L 1/78 1/78 (72) Inventor Shoji Watanabe Omika-cho, Hitachi City, Ibaraki Prefecture No. 7-1-1, Hitachi, Ltd. Hitachi Research Laboratory (56) References JP-A-4-31303 (JP, A) JP-A-54-115689 (JP, A) (58) Fields investigated (Int. . ^7, DB name) C01B 13/10 C02F 1/50 C02F 1/78

Claims (9)

(57) [Claims] 1. An ozone generating means comprising: a plurality of ozone generating means; an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply ozone generated to an ozone reaction tank of a water purification plant; Is an ozone generation and supply device in a water purification plant that includes an ozonizer and a dry air supply unit that sends dry air to the ozonizer, wherein a high-concentration oxygen supply unit is connected between the ozonizer and the dry air supply unit. Ozone generation and supply equipment in a water purification plant. 2. The apparatus for generating and supplying ozone in a water purification plant according to claim 1, wherein the high-concentration oxygen supply means includes a blower and at least two towers filled with an adsorbent for adsorbing and removing N ₂ components in air. An ozone generation and supply device in a water purification plant, comprising a tower. 3. The ozone generation and supply device in a water purification plant according to claim 1, wherein the high-concentration oxygen supply means is an oxygen cylinder. 4. The apparatus for generating and supplying ozone in a water treatment plant according to claim 1, wherein the high-concentration oxygen supply means comprises a blower and at least two columns filled with an adsorbent for adsorbing and removing N ₂ components in air. An ozone generation and supply device in a water purification plant, which is a tower and an oxygen cylinder. 5. The ozone generation and supply device in the water purification plant according to claim 1, wherein a filter is provided in front of the ozonizer, and the high-concentration oxygen supply means is connected in front of the filter. Ozone generation and supply equipment in water treatment plants. 6. The ozone generation and supply device in the water purification plant according to claim 1, wherein the operation / stop / failure information of the ozone generation means and the operation / operation of the high-concentration oxygen supply means are provided.
An ozone generation and supply device in a water purification plant, comprising: a sequencer that outputs a control signal for switching a flow of a dry air flow and a flow of a high-concentration air flow using stop / pressure information as input conditions. 7. An ozone generating means, comprising: a plurality of ozone generating means; and an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply ozone generated to an ozone reaction tank of a water purification plant. Is provided with an ozonizer and a dry air supply means for sending dry air to the ozonizer, a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means, and all of the plurality of ozone generation means operate in a healthy operation. A method for generating and supplying ozone in a water purification plant, wherein the high-concentration oxygen supply means is stopped when the time is exceeded. 8. An ozone generating means comprising: a plurality of ozone generating means; and an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply ozone generated to an ozone reaction tank of a water purification plant. Comprises an ozonizer and dry air supply means for sending dry air to the ozonizer, a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means, and operates all of the plurality of ozone generation means. A method for generating and supplying ozone in a water purification plant, comprising activating a high-concentration oxygen supply means. 9. An ozone generating means, comprising: a plurality of ozone generating means; and an ozone distribution pipe connected to the plurality of ozone generating means in parallel to supply ozone generated to an ozone reaction tank of a water purification plant. Is provided with an ozonizer and dry air supply means for sending dry air to the ozonizer, a high-concentration oxygen supply means is connected between the ozonizer and the dry air supply means, and a part of the plurality of ozone generation means has a failure or An ozone generation and supply method in a water purification plant, wherein when stopped due to maintenance or the like, high-concentration oxygen supply means is operated to supply high-concentration oxygen to ozone generation means that is operating in a healthy manner.