WO2014050520A1

WO2014050520A1 - Gas dissolving device

Info

Publication number: WO2014050520A1
Application number: PCT/JP2013/074217
Authority: WO
Inventors: 直人福原; 澤田　善行; 中野　聡
Original assignee: ヒノデホールディングス株式会社
Priority date: 2012-09-28
Filing date: 2013-09-09
Publication date: 2014-04-03
Also published as: CN104602799A; JP2014069133A; CN104602799B; JP6025115B2

Abstract

The present invention provides a gas dissolving device capable of efficiently dissolving gas in a liquid, until a supersaturated state is reached and by using a comparatively simple structure. This gas dissolving device comprises an upright column-shaped tank (50) and a gas/liquid supply means that pressurizes and supplies a gas-liquid mixture of gas mixed in liquid, to inside the tank (50). The gas dissolving device has a nozzle (40) that sprays the gas-liquid mixture towards the bottom surface side of the tank (50), provided in the upper section inside the tank (50). A partition (60) is provided inside the tank (50), thereby forming: a central flow path (71) following the central axis in the longitudinal direction of the tank (50); an outside flow path (72) following the inner circumferential surface of the tank (50); and a connecting flow path (73) that connects the central flow path (71) and the outside flow path (72) in the short direction. The gas dissolving device is configured such that the gas-liquid mixture sprayed inside the tank (50) from the nozzle (40) is agitated while passing through the central flow path (71), the outside flow path (72), and the connecting flow path (73).

Description

Gas dissolving device

The present invention relates to a gas dissolving apparatus for dissolving a gas such as air, oxygen, ozone, etc. into a liquid.

As an application example of a gas dissolution apparatus, as disclosed in Patent Document 1, an ozone water production apparatus that mixes ozone with water to be treated is known. The apparatus of Patent Document 1 is configured to mix the introduced mixed fluid of water to be treated and ozone by a mixing unit installed in a housing, and pressurize by a pressurizing unit.

However, with this apparatus, only about 5% of ozone can be mixed at a volume ratio under atmospheric pressure. Therefore, Patent Document 2 discloses a two-phase flow in which ozone-containing bubbles are mixed into the water to be treated and discharged at a discharge pressure equal to or higher than atmospheric pressure as an ozone water treatment apparatus that can efficiently mix ozone into the water to be treated. It has a gas-liquid mixing pump, an outer cylinder part that keeps the inside in a sealed state, and an inner cylinder part that is a fine pipe with a large number of fine holes formed in the peripheral surface, and is mixed into the water to be treated Ozone water comprising a gas-liquid contact tube that mechanically crushes and refines the ozone-containing bubbles when passing through the fine holes in the inner cylinder, and a radical reaction tank that retains the water to be treated for a predetermined time A processing device has been proposed.

However, the ozone water treatment apparatus of Patent Document 2 is to refine the ozone-containing bubbles by passing them through the fine holes in the inner cylinder portion in a short time of 1 second or more and 3 seconds or less. (Paragraph 0018), it is necessary to separately provide a reaction tank (radical reaction tank) for dissolving ozone-containing bubbles in the water to be treated. In addition, since the ozone-containing bubbles and the water to be treated flow upward from the bottom of the gas-liquid contact tube and are discharged from the top, the ozone-containing bubbles float without passing through the fine holes, and the top of the gas-liquid contact tube In other words, the ozone-containing bubbles are prevented from being refined, and the dissolution efficiency may be reduced.

JP-A-7-227529 Japanese Patent No. 4271991

The present invention has been made in view of the above, and an object of the present invention is to provide a gas dissolving apparatus capable of efficiently dissolving a gas in a liquid to a supersaturated state with a relatively simple structure.

The gas dissolving apparatus of the present invention comprises an upright columnar tank, and gas-liquid supply means for pressurizing and supplying a gas-liquid mixture obtained by mixing a gas with a liquid in the tank, and an upper part in the tank. And a nozzle that injects the gas-liquid mixture toward the bottom surface of the tank, and by providing a partition in the tank, at least a central flow path along a central axis in the longitudinal direction of the tank And an outer flow path along the inner peripheral surface of the tank, and a communication flow path that communicates the central flow path and the outer flow path in a short direction, and the sprayed into the tank from the nozzle The gas-liquid mixture is stirred while passing through the central flow path, the outer flow path, and the communication flow path.

As described above, in the present invention, the gas-liquid mixture in which the gas is mixed with the liquid is injected at a high pressure from the upper side of the tank toward the bottom surface side, and thereafter, the central flow path and the outer flow path formed by the partition bodies are used. As it passes through, it passes irregularly from the inside to the outside or from the outside to the inside, so that the gas-liquid mixture is efficiently stirred while colliding with each other. As a result, the gas is refined, the surface area of the gas is increased, the contact frequency with water is increased, and at the same time, the residence time is increased, and the amount of dissolved gas is increased.

In the present invention, the partition body can be formed by an inner cylinder body having a plurality of through holes on the peripheral surface. In this case, the inner side of the inner cylinder body serves as a central flow path, and the outer peripheral surface of the inner cylinder body and the tank A space between the peripheral surface and the peripheral surface is an outer flow path, and a through hole is a communication flow path. If an inner cylinder having a plurality of through holes on the peripheral surface is used as described above, the passages can be formed integrally only by installing the inner cylinder in the tank. Moreover, the installation of the inner cylinder in the tank is easy, and the gas dissolving apparatus of the present invention can be easily manufactured.

When the partition body is formed of an inner cylindrical body, it is preferable to provide a collision portion protruding toward the inner side and / or the outer side of the inner cylindrical body at the periphery of the through hole. By providing the collision part in this way, the residence time increases because the gas-liquid mixture collides with the collision part and bounces back, so that the dissolution of the refined gas into the liquid can be further promoted.

In the present invention, the partition body can be formed by a ring body arranged in a plurality of stages at intervals in the longitudinal direction of the tank. In this case, the inner side of the ring body is a central flow path, the outer flow path between the outer peripheral surface of the ring body and the inner peripheral surface of the tank is the outer flow path, and the communication path is between the ring bodies. When the partition body is formed by a plurality of ring bodies, the gas-liquid mixture collides with each ring body and bounces back, so that the residence time increases, so that it is possible to promote the dissolution of the refined gas into the liquid.

In the present invention, a collision plate for closing the central flow path can be provided in the tank. When the collision plate is provided in this way, the residence time can be increased by the gas-liquid mixture after passing through each flow path colliding with the collision plate and rebounding, and further dissolving the refined gas into the liquid. Can be promoted.

Furthermore, in the present invention, a partition plate is provided in the tank, a partition body is disposed in a region above the partition plate, and an opening for generating a vortex in the gas-liquid mixture in the region below the partition plate is provided in the partition plate. Can be provided. With this configuration, the gas refined into the liquid is dissolved in the liquid by stirring using the partition in the region above the partition plate, and the gas to the liquid is stirred by vortex in the region below the partition plate. Can be more efficiently dissolved. That is, two types of stirring can be performed in one tank, the stirring efficiency can be improved, the installation space of the apparatus can be made compact, and the manufacturing cost can be reduced.

According to the present invention, the gas-liquid mixture injected into the tank is agitated irregularly while passing through the central flow path, the outer flow path, and the communication flow path formed by the compartments. The gas can be efficiently dissolved to a supersaturated state. Moreover, as an apparatus structure, it can be set as a comparatively simple structure which only arrange | positions a division body in a tank.

It is explanatory drawing which shows the whole structure of the gas dissolving apparatus by one Embodiment of this invention. The internal structure of the tank of the gas dissolving apparatus of FIG. 1 is shown, (a) is a cross-sectional view thereof, and (b) is an AA arrow view of (a). It is sectional drawing which shows other embodiment of the tank in the gas dissolving apparatus of this invention. It is sectional drawing which shows other embodiment of the tank in the gas dissolving apparatus of this invention. It is sectional drawing which shows other embodiment of the tank in the gas dissolving apparatus of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a conceptual diagram showing the overall configuration of a gas dissolving apparatus according to an embodiment of the present invention. The gas dissolving apparatus of FIG. 1 mixes ozone with water and dissolves it.

Water is pressurized by the pump 10 and flows through the pipe 20. In the middle of the pipe 20, the ozone gas supplied from the ozone generator 30 is mixed, and the gas-liquid mixture is injected into the tank 50 from the nozzle 40 provided at the tip of the pipe 20 while being pressurized. As will be described later, the gas-liquid mixture is stirred in the tank 50, and the gas-liquid mixture (ozone water) in which ozone is dissolved to the supersaturated state by the stirring is taken out from the lower part of the tank 50 and taken out. Is used for sewage treatment and water purification.

In the embodiment of FIG. 1, the pump 10, the pipe 20, and the ozone generator 30 are used as the gas-liquid supply means, and ozone is mixed in the middle of the pipe 20. It is also possible to use a gas-liquid mixing pump, mix ozone with water before the two-phase flow gas-liquid mixing pump, and pressurize and supply the gas-liquid mixture with the two-phase flow gas-liquid mixing pump.

FIG. 2 shows the internal structure of the tank 50 in the gas dissolving apparatus of FIG. 1, (a) is a cross-sectional view thereof, and (b) is an AA arrow view of (a).

The tank 50 is upright in a columnar shape, the nozzle 40 is disposed on the top thereof, and the inner cylinder 60 is disposed in the tank 50 as a partitioning body.

The inner cylinder 60 has a plurality of through holes 61 on the peripheral surface. In the embodiment of FIG. 2, a plurality of right-angled triangular through-holes 61 having a hypotenuse at the bottom are provided in a plurality of stages, and four through-holes 61 are provided at 90 ° intervals in each stage, and 45 in each stage. A plurality of through-holes 61 are arranged so that the phases are staggered and the hypotenuses of the through-holes 61 in each stage are in the same direction and the directions are staggered in the upper and lower stages. Yes. The arrangement of the through holes 61 is not limited to a staggered shape, but at least from the viewpoint of ease of arrangement of the through holes 61, a staggered shape is preferable. In addition, the number of stages of the through holes 61 is not limited to four, and the number (diameter / height) of the tank 50 and the inner cylinder 60 is taken into consideration, and for example, the number is increased by six or eight. Also good.

As shown in FIG. 2 (b), the upper edge of each through-hole 61 is provided with a collision part 62 protruding toward the inside and the outside of the inner cylinder 60 in a bowl shape. The collision part 62 may be provided so as to protrude only inside or outside of the inner cylinder, or may be provided only in a part of the through holes. However, the collision part 62 promotes stirring of the gas-liquid mixture. Is preferably provided so as to protrude inward and outward in substantially all through holes 61. Moreover, you may provide the collision part 62 not only in the upper edge part of the through-hole 61 but in the peripheral part of the position and direction where a gas-liquid mixture collides.

As described above, the inner cylinder 60 having the plurality of through holes 61 on the peripheral surface is arranged in the tank 50, so that the central flow along the central axis in the longitudinal direction (vertical direction) of the tank is formed inside the inner cylinder 60. A passage 71 is formed, an outer flow path 72 is formed between the outer peripheral surface of the inner cylinder 60 and the inner peripheral surface of the tank 50, and the through-hole 61 is connected to the central flow path 71. The communication channel 73 communicates with the outer channel 72 in the lateral direction (horizontal direction).

In the above configuration, the gas-liquid mixture pressurized and supplied via the pipe 20 is ejected radially from the nozzle 40 toward the bottom surface of the tank 50 and in plan view. In the present embodiment, the tip of the nozzle 40 is located in the inner cylinder 60, and the gas-liquid mixture is ejected radially toward the bottom surface of the tank 50 in the inner cylinder 60, and the gas from the nozzle 40 is The spray angle of the liquid mixture (α in FIG. 2: spread angle) is about 0 to 30 degrees. The injection angle is not limited to 0 to 30 degrees, and when the diameters of the tank 50 and the inner cylinder 60 are large, the injection angle may be increased to about 60 degrees.

The gas-liquid mixture passes through the central flow path 71 and the outer flow path 72 formed by the inner cylindrical body 60 and irregularly passes through the communication flow path 73 from the inside to the outside or from the outside to the inside. Therefore, the gas-liquid mixture is efficiently stirred while colliding with each other. Further, the right-angled triangular through holes 61 are arranged as shown in FIG. 2, so that the gas-liquid mixture that has passed through the through holes 61 is efficiently stirred while colliding so as to alternately cross the lower side of the tank 50. Is done. Furthermore, large bubbles remaining in the gas-liquid mixture rise toward the upper side of the tank 50, and are efficiently stirred while the gas-liquid mixture injected from the nozzle 40 collides with the bubbles.

As a result, the gas (ozone) is refined, the surface area is increased, the frequency of contact with water is increased, the residence time is also increased, the amount of ozone dissolved is increased, and ozone can be efficiently dissolved to a supersaturated state. it can. The obtained ozone water is taken out from the take-out pipe 51 at the bottom of the tank 50.

(Embodiment 2)
FIG. 3 is a cross-sectional view showing another embodiment of the tank in the gas dissolving apparatus of the present invention. In the figure, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, a collision plate 80 that closes the central flow path 71 is provided at the lower portion of the inner cylinder 60 disposed in the tank 50. When the collision plate 80 is provided in this way, the gas-liquid mixture after passing through each flow path collides with the collision plate 80 and bounces back, so that the residence time can be increased and the liquid (water) is refined. Dissolution of gas (ozone) can be further promoted.

In the present embodiment, the inner cylinder 60 is not provided with the through hole 61 in the region below the collision plate 80, but the through hole 61 may be provided in a region below the collision plate 80.

In this embodiment, a liquid level adjusting mechanism for adjusting the liquid level in the tank 50 is provided. Specifically, the liquid level adjustment mechanism includes a liquid level gauge 90 that bypasses the tank 50 in the vertical direction, an optical sensor 91 that detects the liquid level of the liquid level gauge 90, and a liquid level detected by the optical sensor 91. And a controller 92 that adjusts through an open / close valve 93 provided in the middle of a pipeline that bypasses the upper portion of the tank 50 and the extraction pipe 51. By using this liquid level adjustment mechanism, the controller 92 adjusts the opening degree of the opening / closing valve 93 and discharges the gas accumulated in the upper part of the tank 50 to the discharge pipe 51, whereby the liquid level in the tank 50, that is, light The liquid level detected by the sensor 91 is adjusted to be a constant level. In the present embodiment, the level of the liquid in the tank 50 is set to be adjusted to the position of the collision plate 80.

In addition, a flow rate adjusting valve is provided in the pipe 20 to adjust the injection amount of the gas-liquid mixture from the nozzle 40, and a flow rate adjusting valve is provided in the connection portion between the lower part of the tank 50 and the take-out pipe 51. The liquid level in the tank 50 may be adjusted by adjusting the amount of ozone water taken out from the tank.

Table 1 shows the test results relating to the amount of dissolved oxygen when the ozone generator 30 is replaced with an oxygen generator in the gas dissolving apparatus of the present embodiment and oxygen is dissolved in water.

While the saturated dissolved oxygen amount at the water temperature of 7 ° C. at the time of the test was 11.75 mg / L, when measured at atmospheric pressure, in any of Examples 1 to 3, the oxygen amount at a concentration five times or more was obtained. It is dissolved, and gas (oxygen) can be dissolved in the liquid (water) until it is supersaturated.

(Embodiment 3)
FIG. 4 is a cross-sectional view showing still another embodiment of the tank in the gas dissolving apparatus of the present invention. In the figure, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

In the present embodiment, a partition body arranged in the tank 50 is formed by a plurality of ring bodies 100. That is, in the present embodiment, a partition body is formed by the ring body 100 arranged in a plurality of stages at intervals in the longitudinal direction of the tank 50, and the inner side of the ring body 100 serves as the central flow path 71, and the outer peripheral surface of the ring body 100 An outer flow path 72 is formed between the tank and the inner peripheral surface, and a communication flow path 73 is formed between the ring bodies.

Also in the present embodiment, as in the first embodiment, the gas-liquid mixture is efficiently stirred while colliding with each other, and the gas (ozone) can be efficiently dissolved to the supersaturated state in the liquid (water). . Furthermore, in this embodiment, since a residence time increases because the gas-liquid mixture collides with each ring body 100 and rebounds, etc., dissolution of refined ozone into water can be promoted.

In the present embodiment, as in the second embodiment, the collision plate 80 that closes the central flow path 71 is provided at the lower part of the partition, but the collision plate 80 is not necessarily provided.

(Embodiment 4)
FIG. 5 is a cross-sectional view showing still another embodiment of the tank in the gas dissolving apparatus of the present invention. In the figure, the same components as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

In this embodiment, in addition to the stirring by the inner cylinder 60 of the first embodiment, stirring by vortex is performed. That is, in this embodiment, the partition plate 110 is provided in the tank 50, the inner cylinder 60 is disposed as a partition body in the region above the partition plate 110 as in the first embodiment, and the region below the partition plate 110 is disposed. The partition plate 110 is provided with an opening 111 for generating a vortex in the gas-liquid mixture. The opening 111 is provided at one location of the partition plate 110, and has a guide portion 112 for generating a vortex along the inner peripheral surface of the tank 50 in the gas-liquid mixture flowing out from the opening 111. .

With such a configuration, in the region above the partition plate 110, the fine gas (ozone) is dissolved in the liquid (water) by stirring using the partition (inner cylinder 60), and the partition Ozone can be dissolved in water more efficiently by stirring by vortex in the region below the plate 110. That is, two types of stirring can be performed with one tank 50, the stirring efficiency can be improved, the installation space of the apparatus can be made compact, and the manufacturing cost can be reduced.

In addition, in this embodiment, although the division body was formed with the inner cylinder body 60, you may form with the some ring body 100 like previous Embodiment 2. FIG.

In the above embodiment, the through hole 61 provided in the inner cylinder 60 as a partition is a right triangle, but the shape is not particularly limited, and any shape such as a circle, an ellipse, a rectangle, a polygon, etc. Also good. However, since the through hole 61 allows the gas-liquid mixture to pass therethrough, a certain amount of opening area is inevitably required. For example, the opening area of one through hole is set to 2500 mm 2 or more. On the other hand, if the opening area of each through-hole 61 is too large, it becomes difficult to arrange a plurality of through-holes 61 evenly. Therefore, the size (diameter / height) of the tank 50 and the inner cylinder 60 is taken into consideration. The area is, for example, 37,500 mm 2 or less. For the same reason, when a partition body is formed by a plurality of ring bodies 100, the interval between the upper and lower ring bodies 100 is about 50 to 300 mm.

Further, in the above embodiment, the partition body is formed by the inner cylindrical body 60 or the plurality of ring bodies 100, but the partition body may be formed by other members. For example, a plurality of chains (chains) are arranged in the tank 50 so as to form a cylinder, the inner side of the chain is the central channel, the outer side of the chain is the outer channel, and the opening of each chain is the connecting channel. Can do.

Furthermore, when a gas-liquid mixture of water (liquid) containing organic matter and ozone (gas) is used, the gas dissolving apparatus according to the present invention can also be used as a water treatment device for decomposing organic matter.

In the above embodiment, ozone is mixed with water, but it goes without saying that the liquid and gas are not limited to water and ozone.

DESCRIPTION OF SYMBOLS 10 Pump 20 Piping 30 Ozone generator 40 Nozzle 50 Tank 51 Extraction pipe 60 Inner cylinder (partition body)
61 Through hole (communication flow path)
62 Collision part 71 Central flow path 72 Outer flow path 73 Connection flow path 80 Collision plate 90 Liquid level meter 91 Optical sensor 92 Controller 93 Open / close valve 100 Ring body (partition body)
110 Partition plate 111 Opening

Claims

An upright columnar tank, and a gas-liquid supply means for pressurizing and supplying a gas-liquid mixture in which gas is mixed with liquid in the tank,
A nozzle for injecting the gas-liquid mixture toward the bottom side of the tank at an upper portion in the tank;
By providing a partition in the tank, at least a central flow path along the central axis in the longitudinal direction of the tank, an outer flow path along the inner peripheral surface of the tank, the central flow path and the outer flow A communication channel that communicates with the road in the short direction,
A gas dissolving device in which the gas-liquid mixture injected from the nozzle into the tank is agitated while passing through the central flow path, the outer flow path, and the communication flow path.
The partition body includes an inner cylinder body having a plurality of through holes on a peripheral surface, and the inner side of the inner cylinder body serves as a central flow path, and a space between the outer peripheral surface of the inner cylinder body and the inner peripheral surface of the tank. The gas dissolving device according to claim 1, wherein the gas flow dissolving device is an outer flow channel and the through hole is a communication flow channel.
The gas dissolving device according to claim 2, wherein a collision portion protruding toward an inner side and / or an outer side of the inner cylindrical body is provided at a peripheral edge portion of the through hole.
The partition body is composed of a ring body arranged in a plurality of stages at intervals in the longitudinal direction of the tank, and the inside of the ring body serves as a central flow path, and the outer peripheral surface of the ring body and the inner peripheral surface of the tank The gas dissolving apparatus according to claim 1, wherein a space is defined as an outer flow path and a communication flow path is defined between the ring bodies.
The gas dissolving apparatus according to any one of claims 1 to 4, wherein a collision plate for closing the central flow path is provided in the tank.
A partition plate is provided in the tank, the partition is disposed in a region above the partition plate, and an opening for generating a vortex in the gas-liquid mixture is provided in the partition plate in a region below the partition plate. The gas dissolving device according to any one of claims 1 to 5.