CN115605285A

CN115605285A - Gas dissolving device

Info

Publication number: CN115605285A
Application number: CN202080100457.3A
Authority: CN
Inventors: 曹银春; 内海伸昭
Original assignee: SANSO ELECTRIC Manufacturing
Current assignee: SANSO ELECTRIC Manufacturing
Priority date: 2020-05-08
Filing date: 2020-08-20
Publication date: 2023-01-13
Also published as: JPWO2021225009A1; WO2021225009A1; EP4147770A4; EP4147770A1

Abstract

The invention is based on the premise that it comprises: a gas dissolving tank (1) in which gas is dissolved in liquid; a partition plate (17) that partitions the interior of the gas dissolving tank (1) into an upper chamber (22) and a lower chamber (23); an introduction pipe (6) for introducing the gas-liquid mixture from the outside into the gas dissolving tank (1); and a discharge pipe (3) for discharging the gas dissolving liquid from the lower chamber (23) of the gas dissolving tank (1), wherein the opening of the downstream end (6 a) of the introduction pipe (6) is directed toward the center of the top (13) of the gas dissolving tank (1), and a communication passage (17 a) for communicating the upper chamber (22) with the lower chamber (23) is formed at a position offset from the center of the partition plate (17).

Description

Gas dissolving device

Technical Field

The present invention relates to a gas dissolving apparatus for dissolving a gas in a liquid under pressure.

Background

Such a device is disclosed in patent document 1, for example. The gas dissolving device disclosed in patent document 1 is included in a fine bubble generation device that generates fine bubbles in a bath. The gas dissolving apparatus of this document includes a gas dissolving tank (referred to as a "gas-liquid dissolving tank" in patent document 1) for dissolving gas in liquid, a suction line of a pump provided from a bath to the gas dissolving tank, an introduction pipe (referred to as an "inflow line" in patent document 1) provided from the pump to the gas dissolving tank, and a discharge line provided from an outlet of the gas dissolving tank to the bath. A gas introduction portion (referred to as a "gas introduction pipe" in patent document 1) for introducing gas is provided in the middle of the suction line. In the gas-liquid dissolving tank, a liquid is filled to a predetermined height, and a liquid region and a gas region are formed.

When the pump is driven, the gas-liquid mixture is ejected from the inlet pipe into the gas-liquid dissolving tank. The ejected gas-liquid mixture collides with a collision portion provided at the top of the gas-liquid dissolution tank. At this time, a high-pressure portion is locally formed, and the dissolution of the gas into the liquid is promoted in the high-pressure portion. The gas-liquid mixture colliding with the collision portion falls from the gas region to the liquid region, and bubbles included in the gas-liquid mixture enter the liquid region. The bubbles entering the liquid region are dissolved in the liquid while being stirred by the flow in the liquid region, and gradually become smaller. Part of the bubbles agitated by the flow in the liquid region is discharged from the discharge port of the gas dissolving tank together with the liquid. Part of the air bubbles and the liquid discharged from the discharge port flow out to the discharge line.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 4759553

Disclosure of Invention

Problems to be solved by the invention

However, in the gas dissolving tank of patent document 1, relatively large bubbles flow out from the discharge port of the gas dissolving tank in a large amount, and therefore there is a problem that: the gas dissolution concentration is difficult to increase, and the gas dissolution efficiency is also difficult to increase.

The present invention has been made in view of the above problems, and an object thereof is to provide a gas dissolving apparatus in which a gas dissolved concentration is easily increased and a gas dissolving efficiency is easily increased as compared with a conventional apparatus.

Means for solving the problems

The gas dissolving apparatus according to claim 1 of the present invention comprises: a gas dissolving tank in which gas is dissolved in liquid; a partition plate that partitions the interior of the gas dissolving tank into an upper chamber and a lower chamber; an introduction pipe for introducing a gas-liquid mixture from the outside into the gas dissolving tank; and a discharge line for discharging the gas dissolving solution from the lower chamber of the gas dissolving tank. The downstream end of the introduction pipe opens toward the center of the top of the gas dissolving tank. A communication passage for communicating the upper chamber and the lower chamber is formed at a position offset from the center of the partition plate.

In the gas dissolving apparatus according to claim 1 or 2 of the present invention, preferably, the top portion is formed with a concave-convex portion, and the introducing pipe is provided so that the gas-liquid mixture discharged from the introducing pipe collides with the collision portion.

In the gas dissolving apparatus according to

claim

2 or 3 of the present invention, it is preferable that the concave-convex portion is a convex portion on the outer side, and a lower end position of the convex portion protrudes downward.

In the gas dissolving apparatus according to claim 4 of the present invention, in the gas dissolving apparatus according to any one of claims 1 to 3, preferably, when a portion of the upper chamber that is lower than the downstream end of the introduction pipe is an effective volume of the upper chamber, the volume of the lower chamber is smaller than the effective volume of the upper chamber.

In the gas dissolving apparatus according to claim 1 to claim 3, it is preferable that the ejection pipe is connected to an ejection port formed in a bottom surface of the gas dissolving tank, and the ejection port is formed at a position offset from the communication passage when viewed from above.

In the gas dissolving apparatus according to claim 6 of the present invention, in the gas dissolving apparatus according to any one of claims 1 to 4, an opening area of the downstream end of the introduction pipe is preferably smaller than an opening area of the upstream end.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a gas dissolving apparatus in which the dissolved gas concentration is easily increased and the gas dissolving efficiency is also easily increased.

Drawings

Fig. 1 is a sectional view of a gas dissolving tank according to the present embodiment.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a diagram showing a gas dissolving apparatus according to the present embodiment.

Fig. 4 is a diagram showing the flow of liquid in the gas dissolving apparatus of the present embodiment.

Fig. 5 isbase:Sub>A view showingbase:Sub>A modification of the collision portion, and corresponds tobase:Sub>A sectional viewbase:Sub>A-base:Sub>A in fig. 1.

Detailed Description

Hereinafter, a gas dissolving apparatus according to an embodiment of the present invention will be described with reference to the drawings. The gas dissolving apparatus 100 of the present embodiment is an apparatus for dissolving gas in liquid. The gas dissolving apparatus 100 includes a gas dissolving tank 1, an intake line 2, a discharge line 3, a pump 4, a gas introduction unit 5, an introduction pipe 6, and the like. In the present embodiment, oxygen is used as the gas, and water is used as the liquid. It goes without saying that a gas other than oxygen (for example, air, carbon dioxide, or nitrogen) may be used as the gas, and a liquid other than water may be used as the liquid.

The gas dissolving tank 1 is configured to dissolve gas in liquid under pressure. The interior of the gas dissolving tank 1 illustrated in fig. 1 is composed of a 1 st portion 7 of a substantially cylindrical space having a relatively large diameter, a 2 nd portion 8 of a substantially cylindrical space having a relatively small diameter, and a 3 rd portion 9 of a substantially frustoconical space continuously formed between the 1 st portion 7 and the 2 nd portion 8. The 1 st portion 7 is formed above the bottom plate portion 11 and inside the large-diameter cylindrical portion 12. The 2 nd portion 8 is formed below the top portion 13 and inside the small-diameter cylindrical portion 14. The 3 rd portion 9 is formed inside a tapered cylindrical portion 16 which is reduced in diameter from the large diameter cylindrical portion 12 and connected to the small diameter cylindrical portion 14.

As shown in fig. 1, the gas dissolving tank 1 is provided with an introduction pipe 6, a partition plate 17, an impact portion 19, and the like.

The partition plate 17 partitions the inside of the gas dissolving tank 1 into an upper chamber 22 and a lower chamber 23. In the present embodiment, the partition plate 17 partitions the 1 st section 7 up and down. A communication passage 17a that communicates the upper chamber 22 and the lower chamber 23 is formed in the partition plate 17. The communication passage 17a is formed in 1 or more positions offset from the center of the partition plate 17.

The volume of lower chamber 23 is smaller than the volume of upper chamber 22. When the effective volume of the upper chamber 22 is defined as a portion of the upper chamber 22 that is lower than the downstream end 6a of the introduction pipe 6, the volume of the lower chamber 23 is smaller than the effective volume of the upper chamber 22. In addition, in the 1 st section 7 vertically divided by the partition plate 17, the volume of the portion below the partition plate 17 is smaller than the volume of the portion above the partition plate 17. Further, as shown in FIG. 1, the liquid area of lower chamber 23 is smaller than the liquid area of upper chamber 22.

The introduction pipe 6 is provided to introduce the gas-liquid mixture from the outside into the gas dissolving tank 1. The introduction pipe 6 is connected to the downstream end of the suction line 2 by the pump 4. In the present embodiment, the introduction pipe 6 is provided along the center line of the gas dissolving tank 1, and the opening of the downstream end 6a thereof faces the center of the ceiling 13 of the gas dissolving tank 1. Further, the introduction pipe 6 penetrates the center of the bottom (bottom plate 11) of the gas dissolving tank 1 and the center of the partition plate 17. In order to increase the discharge flow rate of the gas-liquid mixture from the introduction pipe 6, it is preferable that the downstream end 6a of the introduction pipe 6 has a smaller opening area than the upstream end 6b (see fig. 4) as shown in fig. 1.

The collision portion 19 is formed to have a concave-convex portion at the top portion 13. The concave-convex portion formed in the top portion 13 of the collision portion 19 is formed so that the lower end position of the convex portion protrudes downward as the convex portion is located outward. In the present embodiment, the collision portion 19 is composed of a plurality of 1 st to 3 rd cylindrical members 19a to 19c arranged concentrically. In the example shown in fig. 1, the lower end positions of the 1 st to 3 rd cylindrical members 19a to 19c are located below the outer cylindrical member. The area of the top portion 13 in the range where the collision portion 19 is formed (the area inside the outer diameter D of the 3 rd cylindrical member 19c in the example shown in fig. 2) is smaller than the area of the liquid surface 20 in the gas dissolution tank 1. By doing so, the liquid colliding with the collision portion 19 falls while diffusing in the radial direction of the gas dissolving tank 1, the contact area between the liquid and the gas increases, and the gas dissolving efficiency improves.

The upstream end of the suction line 2 serves as a liquid suction port. In the present embodiment, as shown in fig. 4, the upstream end portion of the suction line 2 is submerged in the liquid 27 stored in the tank 26.

The pump 4 is provided between the downstream end of the suction line 2 and the upstream end of the introduction pipe 6. Therefore, when the pump 4 is driven, the liquid stored in the container 26 is sucked into the suction line 2 and is pressurized and conveyed into the gas dissolving tank 1 through the introduction pipe 6. When the pump 4 is driven, the inside of the gas dissolving tank 1 is pressurized.

The gas introduction part 5 is provided in the middle of the introduction pipe 6. The gas introduction section 5 mixes the compressed gas supplied from the compressed gas supply source 28 into the liquid flowing through the introduction pipe 6. The compressed gas supplied from the compressed gas supply source 28 is naturally supplied at a pressure higher than the pressure in the suction line 2.

The upstream end of the discharge pipe 3 is connected to a discharge port 29 formed in the bottom surface 1a of the gas dissolving tank 1. On the other hand, the downstream end of the discharge line 3 is disposed in the container 26, and the liquid having a high dissolved gas concentration is discharged from the downstream end to the container 26.

In the present embodiment, as shown in fig. 3, the gas dissolving tank 1 is supported by a gas dissolving tank support body 31. The gas dissolving tank support 31 illustrated in the figure includes a housing portion 33 that supports the gas dissolving tank 1 and covers the gas dissolving tank 1. Specifically, the gas dissolving tank support body 31 includes a housing portion 33 and a support base portion 34 fixedly provided in the housing portion 33, and the bottom plate portion 11 of the gas dissolving tank 1 is fixed to the support base portion 34 by bolts or the like. The top 13 of the gas dissolving tank 1 is fixed to the top plate 33a of the housing 33 by bolts or the like. The pipes forming the introduction pipe 6 and the discharge pipe 3 extend downward from the support base 34 by a predetermined dimension, then extend to different sides, and extend to the outside through the housing portion 33. In the example shown in fig. 3, the gas dissolving tank support body 31 is movable by casters 32 provided on the bottom.

In the gas dissolving apparatus 100 configured as described above, when the pump 4 is driven, the liquid is sucked from the tank 26 into the suction line 2, and the gas is mixed into the liquid flowing through the introduction pipe 6 in the gas introduction portion 5 to form a gas-liquid mixture. The gas-liquid mixture is ejected from the downstream end 6a of the introduction pipe 6 into the gas dissolving tank 1.

In the gas dissolving tank 1, the gas is dissolved in the liquid in accordance with the contact area between the liquid and the gas and the pressure in the gas dissolving tank 1. In the upper chamber 22 of the gas dissolving tank 1, a gas region and a liquid region are formed, and the gas-liquid mixture ejected from the downstream end 6a of the introduction pipe 6 first collides with the collision portion 19 to form a local high-pressure portion, in which gas (bubbles) is effectively dissolved in the liquid. Then, the gas-liquid mixture colliding with the collision portion 19 passes through the gas region and reaches the liquid region. When the gas-liquid mixture falls in the gas region, the contact area between the liquid and the gas becomes large, and therefore the dissolution of the gas into the liquid is promoted here as well.

After the gas-liquid mixture reaches the liquid region, bubbles contained in the gas-liquid mixture are stirred by the flow (the flow along the arrow in fig. 1) in the liquid region, and gradually become smaller and are dissolved in the liquid. The liquid in the upper chamber 22 moves to the lower chamber 23 through the communication passage 17a formed in the partition plate 17. Since the communication passage 17a is formed at a position offset from the center of the partition plate 17, bubbles in the upper chamber 22 are less likely to move to the lower chamber 23 than in the case where the communication passage 17a is provided at the center of the partition plate 17 or at the outer peripheral portion of the partition plate 17. Therefore, most of the bubbles are likely to stay in the upper chamber 22, and most of the bubbles are dissolved in the liquid in the upper chamber 22 until they disappear or dissolved in the liquid until they become nano-sized bubbles.

Further, even if a part of the bubbles moves from the upper chamber 22 to the lower chamber 23 through the communication passage 17a, since the discharge port 29 is formed at a position offset from the communication passage 17a when viewed from above, the moved bubbles are hardly immediately discharged from the discharge port 29, and are stirred while riding the flow of the liquid in the lower chamber 23, and are given a chance to be dissolved in the liquid again.

Thus, the gas bubbles discharged from the discharge port 29 without dissolving in the liquid become extremely small, and the gas-dissolved liquid supplied from the discharge pipe 3 to the container 26 becomes a liquid having a high gas-dissolved concentration. Further, since the amount of gas discharged to the outside from the discharge pipe 3 can be reduced, the gas dissolving efficiency is also high.

As is clear from the above description, according to the gas dissolving apparatus 100 of the present embodiment, since the partition plate 17 having the communication passage 17a formed therein is provided in the gas dissolving tank 1, the bubbles in the liquid region are not easily discharged from the discharge port 29, and accordingly, the amount of the gas dissolved in the liquid retained in the gas dissolving tank 1 increases. Therefore, the gas dissolving apparatus 100 of the present embodiment is more likely to increase the gas dissolving concentration and the gas dissolving efficiency than the gas dissolving apparatus of the conventional example.

In addition, in the gas dissolving apparatus 100 of the present embodiment, the volume of the lower chamber 23 is smaller than the effective volume of the upper chamber 22. Therefore, the capacity of the liquid region of the upper chamber 22 can be secured larger than the liquid region of the lower chamber 23. In order to retain the bubbles as much as possible in the gas dissolving tank 1 without being discharged from the discharge port 29, it is preferable that the liquid region of the upper chamber 22 in which the bubbles are relatively large be larger than the liquid region of the lower chamber 23 in which the bubbles are relatively small. In the present embodiment, since the capacity of the liquid region of the upper chamber 22 is secured to be larger than that of the liquid region of the lower chamber 23, the gas dissolved concentration is more likely to increase, and the gas dissolving efficiency is more likely to increase.

Other embodiments

In the above-described embodiment, the collision portion 19 is configured by the plurality of cylindrical members 19a to 19c arranged concentrically, but as a modification, may be configured by two curved plates 19Aa to 19Ac having different radii and arranged concentrically as shown in fig. 5. The lower ends of the curved plates 19Aa to 19Ac also extend downward as the outer curved plate extends. The collision portion 19 is not limited to the above two examples, and various forms may be adopted as long as a concave-convex portion is formed on the lower surface of the top portion 13.

In the above-described embodiment, the introduction pipe 6 penetrates the center of the bottom plate 11 of the gas dissolving tank 1 and the center of the partition plate 17 and is provided along the center line of the gas dissolving tank 1, but the installation form of the introduction pipe 6 is not limited to this. For example, as shown in fig. 5 of patent document 1, the following configuration of the introduction tube may be adopted: the gas dissolving tank is inserted into the gas dissolving tank from the outside through the side portion of the gas dissolving tank in the lateral direction, and is bent upward at the center of the gas dissolving tank so as to be along the center line.

The present invention may be embodied in other various forms without departing from the spirit, gist, or main characteristics thereof. Therefore, the above-described embodiments are to be considered in all respects as illustrative and not restrictive.

Industrial applicability

The present invention can be applied to, for example, a gas dissolving apparatus for dissolving a gas in a liquid under pressure.

Description of the reference numerals

1. A gas dissolving tank; 3. a blow-out line; 6. an introducing pipe; 6a, the downstream end of the introducing pipe; 13. a top portion; 17. a partition plate; 17a, a communication passage; 22. an upper chamber; 23. a lower chamber; 27. a liquid; 29. an outlet port; 100. a gas dissolving device.

Claims

1. A gas dissolving apparatus, comprising:

a gas dissolving tank for dissolving gas in liquid;

a partition plate that partitions the interior of the gas dissolving tank into an upper chamber and a lower chamber;

an introduction pipe for introducing a gas-liquid mixture from the outside into the gas dissolving tank; and

a discharge line for discharging a gas dissolving solution from the lower chamber of the gas dissolving tank,

in the gas dissolving apparatus,

the downstream end of the introduction pipe opens toward the center of the top of the gas dissolving tank,

a communication passage for communicating the upper chamber and the lower chamber is formed at a position offset from the center of the partition plate.

2. The gas dissolving apparatus according to claim 1,

an impact portion is formed so as to form a concave-convex portion on the top portion,

the introducing pipe is arranged so that the sprayed gas-liquid mixture collides with the collision part.

3. The gas dissolving apparatus according to claim 2,

the concave-convex portion is a convex portion on the outer side, and the lower end position of the convex portion protrudes downward.

4. The gas dissolving apparatus according to any one of claims 1 to 3,

when a portion of the upper chamber that is lower than the downstream end of the introduction pipe is set as the effective volume of the upper chamber, the volume of the lower chamber is smaller than the effective volume of the upper chamber.

5. The gas dissolving apparatus according to any one of claims 1 to 3,

the ejection pipe is connected to an ejection port formed in the bottom surface of the gas dissolving tank,

the discharge port is formed at a position offset from the communication passage when viewed from above.

6. The gas dissolving apparatus according to any one of claims 1 to 4,

the downstream end of the introduction pipe has an opening area smaller than that of the upstream end.