JP2003190750A - Gas dissolution apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas dissolution apparatus which can dissolve many gases and can effectively purify water. <P>SOLUTION: This gas dissolution apparatus is equipped with a liquid supply means for supplying a liquid to a sealed tank 1 and a gas supply means for supplying a gas to the sealed tank 1 and/or to the liquid. The sealed tank 1 is divided into a plurality of chambers 1a, 1b, and the liquid is jetted from one chamber to the other by using the pressure difference between the chambers. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas dissolving device, and more particularly, to a gas dissolving device adapted to continuously supply a liquid to a closed tank and dissolve the gas into the liquid while discharging the liquid.

[0002]

2. Description of the Related Art In semiconductor processes, gases such as ozone are dissolved in pure water and used as functional water. Also, in wastewater treatment facilities and dirty rivers and lakes, the amount of dissolved oxygen in water is increased by releasing water in which air and oxygen have been dissolved into water in advance to activate microorganisms and purify wastewater. Devices for performing are known.

FIG. 3 is a schematic configuration diagram showing a conventional example described in Japanese Patent Laid-Open No. 11-207162. In the figure, reference numeral 1 denotes an airtightly closed tank, into which water for dissolving gas is injected, for example, for about 8 minutes. Although not shown in the figure, a gas supply means such as a pump for supplying air, oxygen, etc., a gas cylinder, a gas generator, etc. is arranged in the vicinity of this closed tank. 2 is a nozzle,
The tip of this nozzle is provided in the vicinity of the outer periphery of the closed tank 1 and is arranged along the tangential direction so as to emit light obliquely above the water surface to the water surface.

Reference numeral 3 is a pump that functions as a liquid supply means, and pumps water from, for example, lake water or a river 6 through a stop valve 5 to supply water from the nozzle 2 into the closed tank 1.

Reference numeral 4 is a control valve, which is normally opened to release the water in which gas is dissolved in the closed tank to a place to be purified, but the water in the closed tank 1 is below a predetermined level position. In this case, the water level is adjusted by adjusting the degree of opening / closing to adjust the water level, or by closing the gas control valve 4a to stop the supply of gas. Reference numeral 5 is a stop valve for stopping the supply of water.

Although not shown in the figure, a level gauge for measuring the amount of water in the closed tank and a pressure gauge for measuring the pressure in the closed tank 1 are attached to the closed tank.

In the above structure, a gas (eg oxygen) pressurized to a predetermined pressure is introduced above the closed tank 1. When the pressure of the gas is high, the water level drops, and the water falls below a preset water level. In that case, the gas pressure is adjusted by the gas control valve 4a or the liquid control valve 4 so that the pressure becomes a predetermined pressure level. To control the water level.

[0008]

However, in the conventional example shown in FIG. 3, the jetting of water from the nozzle 2 is carried out only once in the tank, and therefore the atmospheric gas caused by the generation of bubbles or splashes and the entrainment of gas. (Oxygen) was not dissolved effectively.

Further, the water in the tank contains a large amount of bubbles generated by the jet of the nozzle. The bubbles sequentially dissolve in water, and those that do not dissolve rise to diffuse into the gas phase in the tank. That is, the water in the tank having a short residence time does not sufficiently partition the gas and contains bubbles.

In the system shown in FIG. 3, the water is stirred in the tank, and the water that has just jetted out from the nozzle and the water having a long residence time are mixed and flow out from the discharge port of the tank, so that the gas is not dissolved. There was a problem that the water containing undissolved air bubbles was not sufficiently discharged.

The present invention has been made to solve the above problems, and an object thereof is to efficiently dissolve a gas in a liquid to generate a solution having a higher concentration.

[0012]

In order to solve such a problem, the present invention provides a liquid supply means for supplying a liquid to a closed tank, and the closed tank and / or the liquid according to claim 1. A gas dissolving device comprising a gas supply means for supplying a gas, wherein the closed tank is divided into a plurality of chambers, and the liquid is jetted to another chamber by using a pressure difference between the chambers. It has a feature.

According to a second aspect, in the gas dissolving apparatus according to the first aspect, the closed tank is divided into two or more chambers by a partition having a hole, and the liquid supplied to the first chamber passes through the hole to the first chamber. It is characterized in that the liquid is ejected to the second chamber and then the liquid is ejected to the next chamber in sequence.

According to a third aspect of the present invention, in the gas dissolving apparatus according to the second aspect, a plurality of holes are provided, and at least one of them has a nozzle.

According to a fourth aspect of the present invention, in the gas dissolving apparatus according to any of the first to third aspects, a nozzle is used to supply the liquid to the closed tank so that the liquid ejected from the nozzle collides with the baffle plate. It is characterized by being configured in.

According to a fifth aspect of the invention, in the gas dissolving apparatus according to any of the first to third aspects, a nozzle is used to supply the liquid to the closed tank, and the tip of the nozzle is obliquely tangential to the water surface. It is characterized in that it is arranged so as to eject.

According to a sixth aspect, in the gas dissolving apparatus according to any one of the first to fifth aspects, the flow path extending means is provided in the closed tank, and the liquid supplied to the closed tank reaches the discharge port. It is characterized in that the flow path length is extended, the solubility of gas in the supplied liquid is improved, and the outflow of undissolved gas from the liquid outlet is suppressed.

[0018]

DETAILED DESCRIPTION OF THE INVENTION FIG.
It is a schematic block diagram which shows an example of embodiment regarding 3,4. In the figure, the same elements as those in FIG. 3 are designated by the same reference numerals. 3 is that the partition plate 11 is provided in a state where the tank 1 is divided into two in the horizontal direction (the upper part of the partition plate is the first chamber 1a,
The lower side is called the second chamber 1b), the emission direction of the nozzle 2 and the point that the baffle plate 10 is provided, and the point that gas injection means is provided at the front and rear stages of the pump (water supply means) 3.

In this embodiment, the nozzle 2 is provided in the vicinity of the ceiling of the closed tank 1 in a direction substantially perpendicular to the water surface, and a baffle plate 10 is disposed substantially directly below the nozzle emission direction. Further, the partition plate 11 is provided with one or more holes 11a having a predetermined diameter, and the nozzle 2a is attached to at least one of the holes. If the surface of the baffle plate 10 is provided with irregularities, the liquid that has collided with the baffle plate is scattered over a wider area, and the contact time and the amount of contact with the gas can be increased.

According to the above construction, the water ejected from the nozzle collides with the baffle plate 10 to generate a collision pressure between the water and the solid and a large amount of water droplets, whereby the first chamber 1a of the closed tank 1 is caused.
The gas (eg oxygen, air, ozone, etc.) that fills the inside is dissolved and falls onto the water surface. The partition plate 11 is provided with a hole and a nozzle 2a in this hole, and the liquid supplied to the first chamber 1a falls into the second chamber 1b via the nozzle 2a.

In this case, although not shown in the drawing, the tank 1 is provided with a water level and a flow meter, and the first chamber 1a and the second chamber 1 are provided.
The water level of b is controlled to a predetermined height. When the liquid drops from the first chamber 1a to the second chamber 1b, it comes into contact with the gas, so that water is taken in and accumulated in the closed tank 1 also in this process.

In FIG. 1, the baffle plate 10 is provided above the water surface. However, if the water jetted from the nozzle 2 has such a depth as to push the surface water and directly collide with the baffle plate, the baffle plate 10 is placed below the water surface. The water level may be controlled so that Further, in the embodiment, the example in which the tank is divided into two chambers is shown, but it may be divided into three or more chambers.

FIG. 2 shows claims 1, 2, 3, 4, 6 of the present invention.
It is a block diagram which shows the Example regarding. In FIG. 2, the same elements as those of FIG. 3 are designated by the same reference numerals, and overlapping description will be omitted. Reference numeral 21a denotes an inner pipe vertically formed in the tank 1, and the upper and lower parts of the inner pipe 21a are opened,
It is fixed to tank 1. In this example, the nozzle 2 is provided in the vicinity of the ceiling of the closed tank 1 in a direction substantially perpendicular to the water surface and injects into the substantially center of the inner pipe 21a. The baffle plate 10 is arranged substantially horizontally just below the nozzle ejection direction.

Reference numeral 21b is a middle pipe arranged between the outside of the inner pipe 21a and the inner circumference of the tank. The upper part of the middle pipe 21b is fixed near the top of the tank 1 and the lower part is closed. There is. The inside of this middle pipe 21b is the first chamber, and the outside is the second chamber.
The room is made up.

In the above structure, the water jetted from above the inner pipe 21a through the nozzle 2 collides with the baffle plate 10 to generate bubbles. Then, the gas supplied to the tank 1 is dissolved and flows in the direction A from below this pipe. At this time, the large bubbles float in the direction a against the flow of water and are discharged to the gas pool above the dissolution tank.

On the other hand, the small bubbles float in the same direction as the flow of water and the dissolution further proceeds. When it reaches the position where the hole 21c or the nozzle 2a is formed, it ejects in the B direction due to the pressure difference. At this time, the bubbles contained in the water float in the b direction and are discharged to the gas pool 30 above the dissolution tank.

The jetted water is discharged through the control valve 4. If the above-mentioned large bubbles do not float and flow in the direction A, they float in the direction of the gas reservoir 30.
The gas-dissolved water supplied to the chamber becomes high-concentration gas-dissolved water containing no large bubbles.

In this embodiment also, although not shown in the drawing, the tank 1 is provided with a water level meter and a flow meter,
The water level that flows down and accumulates in the B direction is controlled to a predetermined height in consideration of the inflow amount and the discharge amount.

As shown in FIGS. 1 and 2, if gas is injected in the front stage of the pump 3 or a line mixer or injector is attached in the rear stage to inject oxygen in advance, the gas can be taken in efficiently. It is possible.

Here, the flow path extending means is applied to the first chamber for the sake of simplicity of explanation, but even if the flow path extending means is applied to the second chamber, the gas dissolved water discharged from the dissolution tank is , It becomes a high concentration gas dissolved water that does not contain large bubbles.

The above description of the present invention has been presented only with reference to particular preferred embodiments for purposes of illustration and illustration. In the present embodiment, the gas to be dissolved is described as oxygen for the purpose of cleaning lakes, but the gas to be dissolved in water is, for example, CO ₂
Alternatively, various gases can be used depending on the purpose. Further, the liquid is not limited to water and may be another liquid. If unevenness is formed on the surface of the baffle plate, the generation of splashes can be increased. Further, when supplying the liquid to the closed tank, the tip of the nozzle may be arranged so as to be ejected tangentially to the water surface.

Therefore, it will be apparent to those skilled in the art that the present invention can be subjected to many changes and modifications without departing from the essence thereof. The scope of the present invention, which is defined by the description in the scope of claims, includes changes and modifications within the scope.

[0033]

As described above, the gas dissolving apparatus of the present invention comprises the liquid supply means for supplying the liquid to the closed tank,
A gas dissolving device comprising a gas supply means for supplying a gas to the closed tank and / or the liquid, wherein the closed tank is divided into a plurality of chambers, and the liquid is separated from another liquid by using a pressure difference between the chambers. Since it is configured to be jetted into the chamber, it is possible to obtain a high-concentration gas solution.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an example of an embodiment of a gas dissolving apparatus of the present invention.

FIG. 2 is a configuration diagram showing another example of the embodiment of the gas dissolving apparatus of the present invention.

FIG. 3 is a configuration diagram showing a conventional example of a gas dissolving device.

[Explanation of symbols]

1 closed tank 1a Room 1 1b second room 2,2a nozzle 3 pumps 4 control valve 5 stop valves 9 Turbulence generator (line mixer) 10 baffle 11 partition boards 21a inner tube 21b Middle tube 30 gas pool

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Ishii             2-9-32 Nakamachi, Musashino City, Tokyo Yokogawa             Electric Co., Ltd. F-term (reference) 4G035 AA01 AB04 AC01 AC26 AE13

Claims (6)

[Claims] 1. A gas dissolving device comprising liquid supply means for supplying a liquid to a closed tank, and gas supply means for supplying a gas to the closed tank and / or the liquid, the closed tank comprising a plurality of closed tanks. A gas dissolving device, characterized in that the liquid is jetted to another chamber by dividing the chamber into chambers and using the pressure difference between the chambers. 2. The closed tank is divided into two by a partition having holes.
The chamber is divided into more than one chamber, and the liquid supplied to the first chamber is ejected from the hole to the second chamber, and the liquid is sequentially ejected to the next chamber. The gas dissolving device described. 3. The gas dissolving apparatus according to claim 2, wherein a plurality of holes are provided and a nozzle is provided in at least one of the holes. 4. A nozzle is used for supplying the liquid to the closed tank, and the liquid ejected from the nozzle collides with the baffle plate.
The gas dissolution apparatus according to any one of claims. 5. A nozzle is used when the liquid is supplied to the closed tank, and the tip of the nozzle is arranged so as to be jetted obliquely with respect to the water surface in the tangential direction of the tank. A gas dissolving device as described in 1. 6. A flow path extending means is provided in the closed tank,
By extending the flow path length until the liquid supplied to the closed tank reaches the discharge port, improving the solubility of gas in the supplied liquid and suppressing the outflow of undissolved gas from the liquid discharge port. The gas dissolving device according to any one of claims 1 to 5, which is characterized.