WO2013042442A1

WO2013042442A1 - Gas dissolving device

Info

Publication number: WO2013042442A1
Application number: PCT/JP2012/067804
Authority: WO
Inventors: 前田　康成; 伊藤　良泰; 恭子堤; 仁史北村; 尚紀柴田; 朋弘穐田
Original assignee: パナソニック株式会社
Priority date: 2011-09-20
Filing date: 2012-07-12
Publication date: 2013-03-28
Also published as: CN103747856A; JP2013066814A; CN103747856B; KR101590029B1; JP5681910B2; KR20140020358A

Abstract

In the present invention, a gas-liquid mixing tank, intermediate tank, and gas-liquid separation tank are formed divided by a first partition wall and a second partition wall inside a dissolving tank. The gas-liquid mixing tank, intermediate tank, and gas-liquid separation tank are disposed in that order from the upstream side to the downstream side with regard to the flow of a liquid in which a gas is dissolved. The dissolving tank is divided in two, and an upper component is formed on the upper side and a lower component on the lower side. In the upper component, a first partition wall is formed integrally with the upper component, and the first partition wall extends from the upper surface of the upper component downward. In the lower component, a second partition wall is formed integrally with the lower component, and the second partition wall extends upward from the bottom surface of the lower component. A gas circulation pipe is sandwiched between the upper surface of the upper component and the upper part of the second partition wall, and an area between the upper surface of the upper component and the upper part of the second partition wall is made airtight by sandwiching this gas circulation pipe therein.

Description

Gas dissolving device

The present invention relates to a gas dissolving apparatus for dissolving a gas such as air in a solvent such as water.

The present applicant has proposed a gas dissolving device that can be reduced in size, can suppress generation of turbulent flow in a gas-liquid separation tank, and can suppress outflow of large bubbles (Patent Document 1).

The gas dissolving apparatus described in Patent Document 1 has a gas-liquid mixing tank and a large bubble outflow prevention from the upstream side to the downstream side with respect to the flow of the liquid by the two partition walls of the first partition wall and the second partition wall. The dissolution tank is divided in the order of the tank and the gas-liquid separation tank. In this gas dissolving apparatus, the fluid flowing into the dissolving tank is mixed with the gas in the gas-liquid mixing tank to generate a liquid in which the gas is dissolved, and this liquid sequentially flows through the large bubble outflow prevention tank and the gas-liquid separation tank. .

In the gas-liquid separation tank, the remaining gas that does not completely dissolve in the liquid is separated as bubbles. The separated bubbles gradually accumulate as gas in the upper part of the gas-liquid separation tank. Therefore, the gas dissolving apparatus described in Patent Document 1 is provided with a gas circulation path that connects the upper end portion and the lower end portion of the dissolving tank through the outside of the dissolving tank so as to communicate with each other. In the gas circulation path, the gas stored in the dissolution tank is once taken out from the dissolution tank and then returned to the dissolution tank for circulation, and the gas stored in the dissolution tank is reused for liquid generation. To increase the dissolution efficiency.

JP 2010-227782 A

On the other hand, the connection of the gas circulation path requires water tightness so that the liquid generated in the dissolution tank does not leak. For this reason, it is necessary to attach a member that ensures watertightness such as packing, and the problem that the number of parts of the gas dissolving apparatus increases is found.

The present invention has been made in view of the circumstances as described above, and an object of the present invention is to provide a gas dissolving apparatus capable of reducing the number of parts while ensuring water tightness.

In order to solve the above-described problems, a gas dissolving apparatus of the present invention includes a dissolution tank, a first partition wall and a second partition wall provided in the dissolution tank, and an outflow portion provided in the dissolution tank. The gas-liquid mixing tank, the intermediate tank, and the gas are formed in such a manner that the inside of the dissolution tank is partitioned by the first partition wall and the second partition wall, and arranged in order from the upstream side to the downstream side with respect to the flow of the liquid in which the gas is dissolved. A liquid separation tank and a gas circulation pipe formed of an elastic body for supplying a gas accumulated in the upper part of the gas-liquid separation tank to a fluid flowing into the dissolution tank, and the fluid is mixed with the gas in the gas-liquid mixing tank The liquid is generated, and this liquid sequentially flows through the intermediate tank and the gas-liquid separation tank, and flows out from the outflow part to the outside of the dissolution tank. The dissolution tank is divided into two, Top part and bottom In the upper part, a first partition wall that partitions the gas-liquid mixing tank and the intermediate tank is formed integrally with the upper part, and the first partition wall is formed downward from the upper surface of the upper part. In the lower part, the second partition wall that divides the intermediate tank and the gas-liquid separation tank is formed integrally with the lower part, and the second partition wall extends upward from the bottom surface of the lower part, and the gas circulation piping is The upper part is sandwiched between the upper surface of the upper part and the upper part of the second partition wall, and the upper part of the upper part and the upper part of the second partition wall are watertight by sandwiching the gas circulation pipe. Yes.

In this gas dissolving apparatus, it is preferable that the second partition wall and the outflow portion are provided so that the liquid flows in the horizontal direction in the gas-liquid separation tank.

In this gas dissolving apparatus, it is preferable that the second partition wall and the outflow portion are provided so that the liquid flows in the horizontal direction along the outer surface of the intermediate tank.

In this gas dissolving apparatus, the gas-liquid separation tank is preferably provided with vertical ribs extending downward from the upper surface of the gas-liquid separation tank.

In this gas dissolving apparatus, the upper part of the second partition wall is notched to form a notch, and the outflow part is provided at the bottom of the gas-liquid separation tank located at a position away from the notch. It is preferable.

According to the gas dissolving apparatus of the present invention, the number of parts can be reduced while ensuring water tightness.

It is the front view which showed one Embodiment of the gas dissolving apparatus of this invention. It is a longitudinal cross-sectional view of the gas dissolving apparatus shown in FIG. (A), (b), and (c) are an AA sectional view, a BB sectional view, and a CC sectional view, respectively, of the dissolution tank in the gas dissolving apparatus shown in FIG. FIG. 3 is a partially cutaway perspective view of a dissolution tank in the gas dissolving apparatus shown in FIG. 2. It is the schematic diagram shown about the bubble movement suppression by a vertical rib. It is the partially cutaway perspective view which showed the circumference | surroundings of the gas circulation piping in a dissolution tank. It is a disassembled perspective view of the dissolution tank in the gas dissolving apparatus shown in FIG. It is a disassembled perspective view of the dissolution tank in the gas dissolving apparatus shown in FIG.

FIG. 1 is a front view showing an embodiment of the gas dissolving apparatus of the present invention. FIG. 2 is a vertical cross-sectional view of the gas dissolving apparatus shown in FIG. FIGS. 3A, 3B, and 3C are respectively a cross-sectional view taken along lines AA, BB, and CC of the dissolving tank in the gas dissolving apparatus shown in FIG. FIG. 4 is a partially cutaway perspective view of the dissolution tank in the gas dissolving apparatus shown in FIG.

As shown in FIGS. 1 and 2, in the gas dissolving apparatus 1, the pump 3 is fixed on the gantry 2, and the dissolving tank 4 is vertically mounted on the pump 3. The pump 3 supplies a solvent such as water to the dissolution tank 4 under pressure, and includes a solvent suction part 5 on the front surface. The suction part 5 can be connected to a suction pipe (not shown). Moreover, the pump 3 is provided with the discharge part 6 which protrudes upwards in an upper end part.

As shown in FIG. 1, the dissolution tank 4 includes an inflow portion 7 at the bottom, and the inflow portion 7 is connected to the discharge portion 6 of the pump 3. Therefore, the solvent fed by the pump 3 flows into the dissolution tank 4 from the bottom of the dissolution tank 4. The dissolution tank 4 includes an outflow portion 8 at the bottom located at a position different from the inflow portion 7. The outflow part 8 is a part from which the liquid generated in the dissolution tank 4 flows out of the dissolution tank 4, and is disposed on the front side of the dissolution tank 4. The outflow part 8 can be connected to an outflow pipe (not shown) for supplying the liquid to the supply destination.

In the gas dissolving device 1, a gas suction pipe 9 extending in the vertical direction is connected to the suction portion 5 of the pump 3. A gas suction pipe 11 having a gas suction port 10 formed at the tip thereof is connected to the gas suction pipe 9. Due to the negative pressure generated by the operation of the pump 3, a gas such as air to be dissolved in the dissolution tank 4 is sucked from the gas suction port 10 of the gas suction unit 11 and is sucked into the suction unit 5 of the pump 3 through the gas suction pipe 9. It is sent. The gas sent to the suction part 5 is mixed as bubbles in a solvent such as water, and a gas-liquid mixed fluid is generated. This gas-liquid mixed fluid is supplied into the dissolution tank 4 through the discharge part 6 and the inflow part 7 as a fluid.

As shown in FIG. 2, two partition walls, that is, a first partition wall 12 and a second partition wall 13 are provided inside the dissolution tank 4, and the interior of the dissolution tank 4 is the first partition wall 12. The gas-liquid mixing tank 14, the intermediate tank 15, and the gas-liquid separation tank 16 are partitioned by the second partition wall 13. The gas-liquid mixing tank 14 is located on the most upstream side with respect to the flow of the liquid in which the gas is dissolved generated in the dissolution tank 4. The intermediate tank 15 is disposed adjacent to the outside of the gas-liquid mixing tank 14. The gas-liquid separation tank 16 is located on the most downstream side with respect to the liquid flow, and is adjacent to the outside of the intermediate tank 15.

The first partition wall 12 and the second partition wall 13 have a substantially cylindrical shape as shown in FIGS. 3 (a), 3 (b), and 3 (c). The first partition wall 12 partitions the gas-liquid mixing tank 14 and the intermediate tank 15 and extends downward from the upper surface of the dissolution tank 4 as shown in FIG. A lower end of the first partition wall 12 does not reach the bottom surface of the dissolution tank 4, and a gap is formed between the bottom surface of the dissolution tank 4. The gas-liquid mixing tank 14 and the intermediate tank 15 communicate with each other with this gap as a liquid flow path.

The second partition wall 13 divides the intermediate tank 15 and the gas-liquid separation tank 16 and extends upward from the bottom surface of the dissolution tank 4. The 2nd partition wall 13 is provided so that the intermediate tank 15 may surround the circumference | surroundings of the gas-liquid mixing tank 14 from the outer side. In addition, as shown in FIGS. 3A and 3C and FIG. 4, a part of the second partition wall 13 is notched in a substantially arc shape in cross section, and a notch portion 17 is formed. Yes. The intermediate tank 15 and the gas-liquid separation tank 16 communicate with each other through the notch 17. The notch 17 is disposed on the opposite side of the outflow part 8, and the outflow part 8 is located away from the notch 17. The outflow part 8 is provided at the bottom of the gas-liquid separation tank 16 and communicates with the gas-liquid separation tank 16.

In such a dissolution tank 4, as shown in FIG. 2, when the gas-liquid mixed fluid is supplied to the dissolution tank 4 by the operation of the pump 3, the gas-liquid mixed fluid passes through the inflow portion 7 shown in FIG. The gas-liquid mixing tank 14 is jetted upward from the bottom of the dissolution tank 4. The gas-liquid mixed fluid collides with the upper surface of the dissolution tank 4 and the first partition wall 12, rebounds, and gradually accumulates at the bottom of the gas-liquid mixing tank 14. Further, the gas-liquid mixed fluid that collides with the upper surface of the dissolution tank 4 and the first partition wall 12 and rebounds collides with the gas-liquid mixed fluid ejected upward from the bottom of the dissolution tank 4, and the gas-liquid mixing tank 14 collides with the liquid level of the gas-liquid mixed fluid stored in 14, and the gas-liquid mixed fluid is stirred. At this time, the gas mixed through the gas suction pipe 9 shown in FIG. 1 and the gas previously stored in the gas-liquid mixing tank 14 are vigorously mixed with a solvent such as water, and the gas-liquid mixed fluid is stirred. The gas is dissolved in the solvent under pressure, and a liquid in which the gas is dissolved is generated. This is because the gas mixed as bubbles in the gas-liquid mixed fluid is subdivided by shearing by stirring, the surface area in contact with the solvent is increased, and the dissolved concentration of the gas near the liquid surface is reduced by homogenization by stirring. This is because the dissolution rate of the gas in the solvent increases.

The generated liquid flows out to the intermediate tank 15 through a gap between the lower end of the first partition wall 12 and the bottom surface of the dissolution tank 4. As shown in FIGS. 3A and 3C and FIG. 4, the liquid flowing out into the intermediate tank 15 overflows from the notch 17 of the second partition wall 13 and flows out into the gas-liquid separation tank 16. The gas-liquid separation tank 16 separates gas that cannot be dissolved in the liquid from the liquid as bubbles. Since the liquid flow is lifted to the vicinity of the liquid surface, which is the gas-liquid interface, the bubbles move upward by buoyancy. On the other hand, the liquid that has flowed out into the gas-liquid separation tank 16 flows in a direction that does not prevent such bubbles from rising. That is, as shown in FIGS. 3B and 4, the liquid flows in the gas-liquid separation tank 16 in the horizontal direction. The horizontal flow of the liquid is along the outer surface of the intermediate tank 15, and the liquid flowing in the horizontal direction in the gas-liquid separation tank 16 flows out of the dissolution tank 4 from the outflow portion 8. Since the outflow part 8 is provided in the bottom part of the gas-liquid separation tank 16, the outflow of the big bubble which exists in the liquid level vicinity is suppressed.

Thus, in the dissolution tank 4, the second partition wall 13 and the outflow portion 8 are provided in the gas-liquid separation tank 16 so that the liquid flows in the horizontal direction along the outer surface of the intermediate tank 15. 4 can be further reduced in size, and particularly the size in the vertical direction can be reduced. This is effective for shortening the vertical size of the dissolution tank 4. And since the outflow part 8 is provided in the position away from the notch part 17 of the intermediate tank 15, the distance for gas-liquid separation can be taken long and the rising time of a bubble can be lengthened. Since the liquid flows in the gas-liquid separation tank 16 in the horizontal direction, the undissolved gas can be separated from the liquid while flowing, and the gas-liquid separation can be performed efficiently. For this reason, it is possible to suppress the undissolved gas from flowing out of the dissolution tank 4 from the outflow portion 8.

Moreover, in the dissolution tank 4, the intermediate tank 15 is disposed by the second partition wall 13 so as to surround the gas-liquid mixing tank 14 from the outside, thereby suppressing noise that is likely to occur during liquid generation. be able to. Furthermore, since the first partition wall 12 and the second partition wall 13 have a cylindrical shape, the flow of the liquid is homogenized, which is effective for further downsizing of the dissolution tank 4.

Further, as shown in FIGS. 3A and 3C and FIG. 4, the gas-liquid separation tank 16 is provided with vertical ribs 18 extending downward from the upper surface of the gas-liquid separation tank 16. The vertical ribs 18 are formed in small pieces, and three are provided at intervals in the direction in which the liquid flows.

FIG. 5 is a schematic diagram showing bubble movement suppression by vertical ribs.

The bubbles 19 moving upward in the liquid in the gas-liquid separation tank 16 are restricted by the vertical ribs 18 from moving in the horizontal direction in which the liquid flows. The bubbles 19 can only rise in the longitudinal direction of the longitudinal ribs 18, and the plurality of bubbles 19 that rise in this way gradually merge. The vertical ribs 18 also promote the coalescence of the bubbles 19. For this reason, undissolved gas is efficiently separated from the liquid, and large bubbles can be prevented from flowing out from the gas-liquid separation tank 16 to the outflow portion 8. The combined bubbles 19 break when reaching the liquid level, and the undissolved gas accumulates in the upper part of the gas-liquid separation tank 16. In order to discharge the undissolved gas accumulated in the upper portion of the gas-liquid separation tank 16 from the dissolution tank 4, the upper portion of the gas-liquid separation tank 16 of the dissolution tank 4 is as shown in FIGS. A gas release valve 20 is provided.

The gas release valve 20 has a float (not shown) that floats and sinks following the height of the liquid level in the gas-liquid separation tank 16 and is movable in the vertical direction. As the float moves up and down as the liquid level changes, the gas release valve 20 releases and stops the gas stored in the gas-liquid separation tank 16.

Further, in the dissolution tank 4, a gas circulation pipe 21 is provided as shown in FIGS. 2, 3 (a), (b), and (c) in order to reuse the gas accumulated in the upper part of the gas-liquid separation tank 16. There is also.

FIG. 6 is a partially cutaway perspective view showing the periphery of the gas circulation pipe in the dissolution tank.

As shown in FIG. 6, the gas circulation pipe 21 is provided inside the intermediate tank 15 in the vertical direction, and the lower end is connected to the inflow portion 7 of the dissolution tank 4. As shown in FIG. 3C, the upper end portion of the gas circulation pipe 21 is curved in a substantially arc shape along the second partition wall 13 and is disposed horizontally. The gas circulation pipe 21 is formed of an elastic body such as rubber. As shown in FIG. 2, the upper end portion of the gas circulation pipe 21 is disposed between the upper surface of the dissolution tank 4 and the upper portion of the second partition wall 13 and also functions as a packing.

When generating a liquid in which gas is dissolved, a pressure difference is generated between the vicinity of the upper end and the lower end of the gas circulation pipe 21. The pressure near the upper end of the gas circulation pipe 21 is higher than the pressure near the lower end. Moreover, in the inflow part 7 shown in FIG. 6, since the flow velocity of a gas-liquid mixed fluid is quick, it is pressure-reduced. Therefore, the undissolved gas accumulated in the upper part of the gas-liquid separation tank 16 is sucked from the upper end of the gas circulation pipe 21 and supplied to the inflow portion 7 from the lower end. The gas sent to the inflow portion 7 is mixed with the gas-liquid mixed fluid again and dissolved in the solvent in the gas-liquid mixing tank 14. As described above, the dissolution tank 4 is provided with the gas circulation pipe 21 that supplies the gas accumulated in the upper part of the gas-liquid separation tank 16 to the gas-liquid mixed fluid flowing into the dissolution tank 4. It can be reused, and gas dissolution efficiency is improved.

Note that the gas circulation pipe 21 is not limited to the inside of the intermediate tank 15 but can be provided inside the gas-liquid separation tank 16. Even if it is provided inside the gas-liquid separation tank 16, the gas circulation pipe 21 functions in the same manner as when it is provided inside the intermediate tank 15. Further, as shown in FIG. 1, a downwardly inclined surface portion 22 is formed in the upper part of the dissolution tank 4. The gas accumulated in the upper portion of the gas-liquid separation tank 16 is collected near the center of the dissolution tank 4 by the inclined surface portion 22, the gas is smoothly sucked from the upper end of the gas circulation pipe 21, and the gas flows into the inflow portion 7. Can be supplied efficiently.

As shown in FIGS. 1 and 2, the dissolution tank 4 as described above is divided into two parts at the center in the vertical direction, and is formed of an upper part 23 on the upper side and a lower part 24 on the lower side. .

FIG. 7 is an exploded perspective view of the dissolution tank in the gas dissolving apparatus shown in FIG. FIG. 8 is an exploded perspective view of the dissolution tank in the gas dissolving apparatus shown in FIG. 7 and 8, the dissolution tank is illustrated from different directions.

7 and 8, in the upper part 23, the first partition wall 12 is integrally formed, and the first partition wall 12 extends downward from the upper surface of the upper part 23. In the lower part 24, the second partition wall 13 is integrally formed, and the second partition wall 13 extends upward from the bottom surface of the lower part 24. The lower part 24 is integrally provided with the inflow portion 7 and the outflow portion 8 at the bottom. At the lower end edge of the upper part 23 and the upper end edge of the lower part 24,

flange parts

25 and 26 are provided to protrude outward. The dissolution tank 4 is assembled by overlapping the

flange parts

25 and 26 and fastening the upper part 23 and the lower part 24 with appropriate fasteners such as bolts and nuts at predetermined portions of the overlapping

flange parts

25 and 26, Become one. At the time of this assembly, the first partition wall 12 is inserted inside the second partition wall 13, and the gas-liquid mixing tank 14, the intermediate tank 15, and the gas-liquid separation tank 16 are formed. Further, the upper end portion of the gas circulation pipe 21 formed of the elastic body shown in FIG. 3C is located between the upper surface of the upper part 23 and the upper portion of the second partition wall 13 as shown in FIG. It is caught. By sandwiching the gas circulation pipe 21, the gas circulation pipe 21 functions as a packing, and the space between the upper surface of the upper part 23 and the upper part of the second partition wall 13 becomes watertight. For this reason, it can suppress that a liquid flows out into the gas-liquid separation tank 16 from the intermediate tank 15 in parts other than the notch part 17 of the 2nd partition wall 13. FIG. Such watertightness between the upper surface of the upper part 23 and the upper part of the second partition wall 13 is realized by the gas circulation pipe 21 that supplies the gas accumulated in the upper part of the gas-liquid separation tank 16 to the dissolution tank 4. Therefore, the dissolution tank 4 has a reduced number of parts.

The present invention is not limited to the above embodiment. Various aspects are possible about details, such as a structure and structure of a pump and a mount frame, and a structure and structure of a gas discharge valve.

DESCRIPTION OF SYMBOLS 1 Gas dissolution apparatus 4 Dissolution tank 8 Outflow part 12 1st partition wall 13 2nd partition wall 14 Gas-liquid mixing tank 15 Intermediate tank 16 Gas-liquid separation tank 17 Notch part 18 Vertical rib 21 Gas circulation piping 23 Upper part 24 Lower part

The gas dissolving apparatus of the present invention ensures water tightness and has a reduced number of parts.

Claims

A dissolution tank;
A first partition wall and a second partition wall provided inside the dissolution tank;
An outflow section provided in the dissolution tank;
A gas-liquid mixing tank and an intermediate tank, which are formed by dividing the inside of the dissolution tank by the first partition wall and the second partition wall, and are arranged in order from the upstream side to the downstream side with respect to the flow of the liquid in which the gas is dissolved. And a gas-liquid separation tank,
A gas circulation pipe formed of an elastic body for supplying a gas accumulated in an upper portion of the gas-liquid separation tank to a fluid flowing into the dissolution tank;
The fluid is mixed with gas in the gas-liquid mixing tank to generate the liquid, and the liquid sequentially flows through the intermediate tank and the gas-liquid separation tank and flows out of the dissolution tank from the outflow portion. A gas dissolving device comprising:
The dissolution tank is divided into two and formed from an upper part on the upper side and a lower part on the lower side,
In the upper part, the first partition wall that partitions the gas-liquid mixing tank and the intermediate tank is formed integrally with the upper part, and the first partition wall extends downward from the upper surface of the upper part. ,
In the lower part, the second partition wall that partitions the intermediate tank and the gas-liquid separation tank is formed integrally with the lower part, and the second partition wall extends upward from the bottom surface of the lower part. ,
The gas circulation pipe is sandwiched between the upper surface of the upper part and the upper part of the second partition wall, and the gas circulation pipe is sandwiched between the upper surface of the upper part and the upper part of the second partition wall. A gas dissolution apparatus characterized by being watertight.
The gas dissolving apparatus according to claim 1, wherein the second partition wall and the outflow portion are provided so that the liquid flows in the gas-liquid separation tank in a horizontal direction.
The gas dissolving apparatus according to claim 2, wherein the second partition wall and the outflow portion are provided so that the liquid flows in a horizontal direction along an outer surface of the intermediate tank.
The gas dissolving apparatus according to any one of claims 1 to 3, wherein the gas-liquid separation tank is provided with vertical ribs extending downward from an upper surface of the gas-liquid separation tank.
The upper part of the second partition wall is partially cut away to form a notch, and the outflow part is provided at the bottom of the gas-liquid separation tank located at a position away from the notch. The gas dissolving apparatus according to any one of claims 1 to 4, wherein