JPH09124306A - Ozone treating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozone treating apparatus capable of quickly following to load variation of ozone injection percentage caused by variation of ozone concentration and smoothly purifying water. SOLUTION: This ozone treating apparatus has a pressure vessel 5 so as to have always more air amount than a using air amount of an ozonizer 8 between a compressor 1 and the ozonizer 8 by cooling raw material air from the compressor 1 by a cooler 3, dehumidifying the air by a drier 4 and ozonizing the resultant air by the ozonizer 8. Then, the air can be supplied from the pressure vessel 5 and water to be treated can quickly be treated even when an amount of air used in the ozonizer is varied according to the load variation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone treatment apparatus, particularly a dryer, which utilizes an ozone oxidation reaction process used in water and wastewater treatment facilities.

[0002]

^2. Description of the Related Art In a conventional ozone treatment apparatus, as shown in FIG. 7, the roots blower 21 boosts the air pressure to about 1.0 kgf / cm ² and cools the air temperature rise due to adiabatic compression to about 5 ° C. by a cooler 3. ， Remove the drain. The cooling air is sent to the dryer 4. The dryer 4 is composed of two or more drying cylinders filled with an adsorbent. For example, the first drying cylinder dehumidifies air and the second drying cylinder removes adsorbed water. Regenerated by heating with heated high temperature air. After the heating and regeneration, a part of the air dried in the first drying cylinder is used to shift to the cooling and regeneration step of cooling the second drying cylinder to the set temperature (about 5 ° C.). The two drying cylinders are switched every eight hours and alternate operation is performed.

Dry air is passed through the ozonizer 8 to generate ozonized air by glow discharge. Ozonized air is diffused from the air diffusers 9-1 and 9-2 into the ozone contact basin 9 to oxidize and decompose organic substances and off-flavor substances in the water for water purification treatment.

A technique of this kind is disclosed in Japanese Patent Laid-Open No. 55-2303.
Publication No. 2 can be mentioned.

[0005]

Since the conventional air source is the roots blower 21, it is not suitable for controlling the number of revolutions. Therefore, it is necessary to constantly blow a constant amount of air and discharge excess air, which consumes unnecessary power. There was a drawback to

Further, in the conventional ozone treatment apparatus, since the air volume becomes constant due to the roots blower, the ozone concentration changes and it is not possible to quickly follow the load fluctuation of the ozone injection rate.
There was a risk that water purification could not be performed smoothly.

Further, in the conventional dryer, if a failure occurs on the air source side during cooling and regeneration of the second drying cylinder, the second cooling cylinder can be cooled to the set temperature by the dried cooling air of the first drying cylinder. However, there is a risk that the second drying cylinder cannot be used when the failure is resolved, and that the water purification process cannot be performed smoothly.

Further, in the conventional dryer, since the dry air from the first drying cylinder is not required during the heating and regeneration of the second drying cylinder, it has to be exhausted, and there is a drawback that wasteful power is consumed. It was

An object of the present invention is to provide an ozone treatment apparatus which can smoothly purify water and produce an energy saving effect.

[0010]

In the ozone treatment apparatus of the present invention, the raw material air from the compressor is cooled by a cooler, this air is dehumidified by a drier, and it is made into ozonized air by an ozonizer. In the equipment for purifying water in (1), a pressure vessel is provided between the compressor and the ozonizer in order to always have a larger air volume than the air volume used by the ozonizer.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, raw air is compressed by a compressor 1
The compressed air is pumped to the cooler 3 and cooled by the cooler 3 to about 5 ° C. The cooling air is sent to the dryer 4, and the air dried by the dryer 4 is continuously supplied until the pressure container 5 reaches a predetermined pressure. The dry air from the pressure vessel 5 is adjusted according to the load of the ozonizer 8 to the flow control valve 7
Is automatically controlled to pass through the ozonizer 8 to generate ozonized air by a discharge process.

Ozonized air is diffused from the air diffusers 9-1 and 9-2 into the ozone contact basin 9 to oxidize and decompose organic substances and off-flavor substances in the water for water purification treatment. Excess residual ozone that is not absorbed in the ozone contact pond is released into the atmosphere as oxygen by the exhaust ozone treatment device 10 without environmental problems.

The raw air supply device for the compressor 1, the cooler 3, the dryer 4, and the pressure vessel 5 always has a larger air amount than the air amount used in the ozonizer 8, and the air amount used in the ozonizer 8 varies. Even in this case, however, the amount of air is immediately supplied to the ozonizer 8 from the pressure container 5 or the compressor 1 and the pressure container 5 according to the fluctuation, so that stable water treatment can be always performed.

As shown in FIG. 2, the pressure control of the compressor 1 unloads the compressor 1 when the pressure of the pressure container 5 becomes equal to or higher than the upper limit pressure (p + Δp), and the pressure of the pressure container 5 becomes the lower limit pressure ( If it becomes p-Δp) or less, the compressor 1 is on-loaded. The pressure in the pressure vessel 5 is detected by the pressure indicator 5-1 and the detection signal is sent to the controller 1-1. The detection signal taken into the controller 1-1 is arithmetically processed to determine the on-load and unload operation of the compressor 1.

The cycle time including the unload time (t _U ) and the on-load time (t _L ) becomes shorter as the load on the ozonizer 8 increases, because the consumption of the amount of ozonized air increases. However, considering the life of the compressor 1, the cycle time is set to about 20 seconds or more.

Even if the unload operation is switched to the on-road operation, it takes time to reach the on-road operation. During this period, in this embodiment, the amount of air in the raw material air supply device including the pressure vessel 5 is always larger than the amount of air used in the ozonizer 8. Therefore, the amount of air in the pressure vessel 5 is supplied to ensure stable water purification. I am able to process it.

Now, as shown in FIGS. 3 and 4, the dryer 4
Is a first drying cylinder 16A and a second drying cylinder 1 filled with an adsorbent
6B, the first drying cylinder 16A supplies the air dried in the dehumidifying step to the ozonizer 8 via the pressure vessel 5. The second drying cylinder 16B is regenerated by heating the adsorbent that has adsorbed moisture in the regeneration process with high temperature air heated by the heater 18 to remove moisture. In the second drying cylinder 16B,
Cooling regeneration after heating regeneration is circulated in the direction of the arrow in FIG.

That is, when the compressor 1 is on-load, a part of the air dried in the first drying cylinder 16A is partially removed by the solenoid valve 1.
It is taken into the cooling regeneration circuit via 7-1 and the second drying cylinder 1
The hot air after passing through 6B is cooled by a cooler 19-1, and the temperature rise due to adiabatic compression by the blower 20 is reduced by a cooler 19-.
It is cooled at 2, and is circulated again in the second drying cylinder 16B. In order to stabilize the dew point performance, the same amount of the dry air taken into the cooling regeneration circuit in the high temperature air that has passed through the second drying cylinder 16B is exhausted via the solenoid valve 17-2.

On the other hand, since the air supply from the compressor 1 is cut off when the compressor 1 is unloaded and when it fails, the dry air of the pressure vessel 5 is used via the solenoid valve 17-1 during the cooling and regeneration process of the dryer 4. To do. The check valve 2-2 prevents backflow into the first drying cylinder 16A.

The role division of the dryer 4 in the sequence is shown in FIG.
As shown in, the first drying cylinder 16A is a dehumidifying process and the second drying cylinder 16B is a regenerating process. The dehumidifying process and the regenerating process are replaced every 8 hours. The regeneration process is divided into a heating regeneration process and a cooling regeneration process. In the heating regeneration process, the heater 18 is turned on, the solenoid valve (M ₂ ) 17-2 and the solenoid valve (M
₄ ) 17-4 is open (ON), solenoid valve (M ₁ ) 17-1
The solenoid valve (M ₃ ) 17-3 is closed (OFF). Since the dry air from the first drying cylinder 16A is unnecessary in the heating regeneration step, by closing the solenoid valve (M ₁ ) 17-1,
Energy saving effect without consuming extra dry air.

In the cooling and regenerating process, the heater 18 is OF
F, solenoid valve (M ₁ ) 17-1, solenoid valve (M ₂ ) 17-2
The solenoid valve (M ₃ ) 17-3 is open (ON), and the solenoid valve (M ₄ ) 17-4 is closed (OFF).

These operations are performed by the timer (T) in the dryer.
The controller 4 sends a signal indicating the end of the heating and cooling regeneration process by 22.
-1, the detection signal taken into the controller 4-1 is arithmetically processed and the heater 18, the solenoid valve (M ₁ ) 17-1, the solenoid valve
(M ₂ ) 17-2, solenoid valve (M ₃ ) 17-3, and solenoid valve (M ₄ ) 17-4 are turned on and off.

In this embodiment, the controller 4 indicates that the timer (T) 22 provided in the dryer 4 has exceeded the heating regeneration process time.
-1 as an input signal, the controller 4-1 performs arithmetic processing to turn off the heater 18 and the solenoid valve (M ₁ ) 17-1,
The solenoid valve (M ₂ ) 17-2 and the solenoid valve (M ₃ ) 17-3 are opened (ON) and the solenoid valve (M ₄ ) 17-4 is closed (OFF), and the cooling regeneration process is performed. If the compressor 1 breaks down and the air supply is cut off during the cooling regeneration process, the dry air is supplied from the pressure vessel 5 to the second drying cylinder 16B and cooled down to the set temperature (about 5 ° C.). Since the second drying cylinder 16B can be used immediately when the failure of the compressor 1 is repaired, without wasting the cooling regeneration process, the ozone processing apparatus can be operated smoothly.

FIG. 6 shows the case where the pressure vessel 5 is installed between the compressor 1 and the cooler 3.

In this case, since the constant pressure is maintained in the pressure vessel 5 even when the compressor 1 is unloaded, the dryer 4
The air supply to the dryer is not interrupted, and the performance of the dryer 4 is not deteriorated. Therefore, dry air having a stable dew point performance can be always sent to the ozonizer 8 and the ozone processing apparatus can be operated smoothly.

When the compressor 1 breaks down and the air supply is cut off during the cooling regeneration process, the dry air of the other system is supplied from the common header 6-1 to the second drying cylinder 16B and cooled to the set temperature. As a result, when the failure of the compressor 1 is repaired without wasting the conventional cooling regeneration process,
Since the second drying cylinder 16B can be used immediately, the ozone treatment device can be operated smoothly and the pressure vessel can be omitted.

As described above, according to the embodiment of the present invention,
You can now achieve the following effects.

(1) The raw material air supply device for the compressor, the cooler, the dryer and the pressure vessel always has a larger air volume than the air volume used in the ozonizer, and even if the air volume used in the ozonizer fluctuates, Since the amount of air is immediately supplied from the pressure vessel to the ozonizer according to the fluctuation, stable water purification treatment can be performed at all times.

Even when the compressor is switched from the unloading operation to the on-loading operation, the amount of air in the raw material air supply device including the pressure vessel is always larger than the amount of air used in the ozonizer until the on-loading operation is reached. As a result, the amount of air in the pressure vessel can be supplied to constantly perform stable water purification treatment.

(2) When the pressure vessel is installed between the compressor and the ozonizer, when the compressor fails and the air supply is cut off during the cooling and regeneration process of the dryer, the dry air is discharged from the pressure vessel into the second drying cylinder. The second drying cylinder can be used immediately when the compressor is repaired, without wasting the cooling and regenerating process so far, and the ozone treatment device can be smoothly installed. I was able to drive.

(3) When the pressure vessel is installed between the compressor and the cooler particularly in (2), the pressure is kept constant in the pressure vessel even when the compressor is unloaded, so that the air is supplied to the dryer. There is no break, and the performance of the dryer is not degraded. Therefore, dry air with stable dew point performance can always be sent to the ozonizer, and the ozone treatment device can be operated smoothly.

In the cooling regeneration process, if the compressor fails and the air supply is cut off, dry air is supplied from the space between the dryer and the ozonizer to the second drying cylinder to cool it to the set temperature. Since the second drying cylinder can be used immediately when the compressor is repaired, the ozonizer can be operated smoothly without wasting the cooling regeneration process up to.

(4) Since the dry air from the first drying cylinder is not necessary in the heating and regeneration process of the dryer, the dry air supply path to the second drying cylinder is closed by closing the solenoid valve to remove excess dry air. Running cost can be reduced without consuming.

[0035]

As described above, according to the ozone treatment apparatus of the present invention, the water purification treatment can be smoothly performed, and the stable water purification treatment can be performed.

[Brief description of the drawings]

FIG. 1 is an overall schematic explanatory view of an ozone processing apparatus shown as an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operating condition of the compressor shown in FIG.

FIG. 3 is an explanatory diagram illustrating a heating regeneration process of the dryer of FIG. 1.

FIG. 4 is an explanatory diagram illustrating a cooling regeneration process of FIG. 1.

5 is a sequence explanatory diagram of a regeneration process of the dryer of FIGS. 3 and 4. FIG.

FIG. 6 is an overall schematic explanatory diagram of an ozone processing apparatus shown as another embodiment of the present invention.

FIG. 7 is an overall schematic explanatory view of a conventional ozone processing apparatus.

[Explanation of symbols]

1 ... Compressor (C), 1-1 ... Controller (CE), 2
... Check valve, 3 ... Cooler (CL), 4 ... Dryer (DR
Y), 4-1 ... Controller (CE), 5 ... Pressure vessel (V), 5
-1 ... Pressure indicator (P), 6 ... Common header, 7 ... Flow controller, 8 ... Ozonizer (OZN), 8-1 ... Power control panel (Sp), 9 ... Ozone contact pond, 9-1 ... Dispersion Trachea, 9-2
... water to be treated, 10 ... waste ozone treatment device, 11 ... water quality measuring instrument (S ₁ ), 12 ... flow rate measuring instrument (S ₂ ), 13 ... thermometer (S ₃ ), 14 ... monitoring control board (SBd), 15 ... Three-way valve, 16 ... Drying cylinder, 17 ... Electromagnetic valve, 18 ... Heater (H
t), 19 ... Cooler (Cl), 20 ... Blower (BL),
21 ... Roots blower (BL), 22 ... Timer (T).

 ──────────────────────────────────────────────────の Continued on front page (72) Inventor Shigeo Shiono 1-1-1 Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Hitachi Kokubu Plant

Claims (5)

[Claims] 1. The amount of air used by an ozonizer in a facility for cooling raw air from a compressor with a cooler, dehumidifying the air with a dryer and turning it into ozonized air with an ozonizer, and purifying water with an ozone contact pond. An ozone treatment apparatus, wherein a pressure vessel having a larger amount of air or a pressure vessel and a compressor are provided on an inflow side of an ozonizer. 2. A facility for cooling raw air from a compressor with a cooler, dehumidifying this air with a drier to turn it into ozonized air with an ozonizer, and purifying water with an ozone contact pond. It consists of one drying cylinder and second drying cylinder, the first drying cylinder is used for dehumidification, and the inflow of the ozonizer when a failure occurs on the compressor side during cooling regeneration of the second drying cylinder or when the compressor is unloaded. An ozone treatment apparatus, wherein dry air is supplied to a second drying cylinder from a pressure container provided on the side. 3. The pressure vessel is installed between a compressor and a cooler, and when the compressor fails during the cooling regeneration process of the second drying cylinder, the pressure vessel or another series of dry air is fed to the second drying cylinder. It supplies, The ozone processing apparatus of Claim 2 characterized by the above-mentioned. 4. A facility for cooling raw material air from a compressor with a cooler, dehumidifying this air with a drier and turning it into ozonized air with an ozonizer, and purifying water with an ozone contact pond. Ozone treatment characterized by comprising a dry cylinder of a cylinder, wherein the first dry cylinder is used for dehumidification, and the valve of the dry air supply path to the second dry cylinder is closed while the second dry cylinder is being heated and regenerated. apparatus. 5. A control unit for controlling an electromagnetic valve of a dry air supply path to a drying cylinder according to a heating regeneration end time or a cooling regeneration end time of the dryer is provided.
The ozone treatment device described.