EP4147770A1 - Gas dissolution device - Google Patents
Gas dissolution device Download PDFInfo
- Publication number
- EP4147770A1 EP4147770A1 EP20934639.4A EP20934639A EP4147770A1 EP 4147770 A1 EP4147770 A1 EP 4147770A1 EP 20934639 A EP20934639 A EP 20934639A EP 4147770 A1 EP4147770 A1 EP 4147770A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- dissolving tank
- liquid
- intake tube
- upper chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004090 dissolution Methods 0.000 title description 2
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 238000005192 partition Methods 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 129
- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/25—Mixing by jets impinging against collision plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/234—Surface aerating
- B01F23/2341—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere
- B01F23/23413—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere using nozzles for projecting the liquid into the gas atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
- B01F23/45—Mixing liquids with liquids; Emulsifying using flow mixing
- B01F23/454—Mixing liquids with liquids; Emulsifying using flow mixing by injecting a mixture of liquid and gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
- B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/50—Movable or transportable mixing devices or plants
- B01F33/502—Vehicle-mounted mixing devices
Definitions
- the present invention relates to a gas dissolver that dissolves gas in liquid under pressure.
- a gas dissolver is described in, for example, Patent Literature 1.
- the gas dissolver described in Patent Literature 1 is a microbubble generator that generates microbubbles in a bath.
- the gas dissolver in this literature includes a gas dissolving tank (a gas-liquid dissolving tank in Patent Literature 1) that dissolves gas in liquid, a suction pipe channel extending from the bath to a pump for the gas dissolving tank, an intake tube (an inlet pipe channel in Patent Literature 1) extending from the pump into the gas dissolving tank, and a discharge pipe channel extending from the exit of the gas dissolving tank to the bath.
- a gas intake (a gas intake tube in Patent Literature 1) for introducing gas is located halfway along the suction pipe channel.
- the gas-liquid dissolving tank is charged with liquid to a predetermined height, thus defining a liquid area and a gas area.
- the intake tube ejects a gas-liquid mixture in the gas-liquid dissolving tank.
- the ejected gas-liquid mixture collides with a collision section on the ceiling of the gas-liquid dissolving tank.
- the collision forms a local high-pressure part, at which the gas dissolves more readily in the liquid.
- the gas-liquid mixture falls from the gas area to the liquid area, and air bubbles contained in the gas-liquid mixture enter the liquid area.
- the air bubbles dissolve in the liquid while being agitated by the flow in the liquid area, and decrease in size.
- the air bubbles agitated by the flow in the liquid area are discharged partially through the outlet in the gas dissolving tank together with the liquid.
- the partial air bubbles and the liquid discharged through the outlet flow into the discharge pipe channel.
- Patent Literature 1 Japanese Patent No. 4759553
- Patent Literature 1 cannot easily increase the dissolved gas concentration due to relatively large air bubbles flowing out in large amounts through the outlet in the gas dissolving tank, and also cannot easily increase the gas dissolving efficiency.
- one or more aspects of the present invention are directed to a gas dissolver that increases the dissolved gas concentration and the gas dissolving efficiency more easily than known structures.
- a gas dissolver includes a gas dissolving tank that dissolves gas in liquid inside, a partition dividing an inside of the gas dissolving tank into an upper chamber and a lower chamber, an intake tube to introduce a gas-liquid mixture into the gas dissolving tank from outside, and a discharge pipe channel to discharge gas dissolved liquid from the lower chamber of the gas dissolving tank.
- the intake tube has a downstream end with an opening extending toward a center of a ceiling of the gas dissolving tank.
- the partition includes a connecting path connecting the upper chamber and the lower chamber. The connecting path is off a center of the partition.
- a gas dissolver according to a second aspect of the present invention is the gas dissolver according to the first aspect in which the ceiling may include a collision section defining a protrusion-dent portion, and the intake tube may be located to cause an ejected gas-liquid mixture to collide with the collision section.
- a gas dissolver according to a third aspect of the present invention is the gas dissolver according to the second aspect in which the protrusion-dent portion may include protrusions having lower ends extending further downward at positions more outward.
- a gas dissolver according to a fourth aspect of the present invention is the gas dissolver according to any one of the first to third aspects in which the lower chamber may have a volume smaller than an effective volume of the upper chamber, where the effective volume of the upper chamber is a part of the upper chamber below the downstream end of the intake tube.
- a gas dissolver according to a fifth aspect of the present invention is the gas dissolver according to any one of the first to third aspects in which the discharge pipe channel may be connected to an outlet in a bottom surface of the gas dissolving tank, and the outlet may be off the connecting path as viewed from above.
- a gas dissolver according to a sixth aspect of the present invention is the gas dissolver according to any one of the first to fourth aspects in which the intake tube may have a smaller opening area at the downstream end than at an upstream end.
- the gas dissolver according to the above aspects of the present invention increases the dissolved gas concentration and the gas dissolving efficiency easily.
- a gas dissolver 100 according to the present embodiment is a device for dissolving gas in liquid.
- the gas dissolver 100 includes a gas dissolving tank 1, a suction pipe channel 2, a discharge pipe channel 3, a pump 4, a gas introducer 5, and an intake tube 6.
- the gas is oxygen
- the liquid is water.
- the gas may be a gas different from oxygen (e.g., air, carbon dioxide, or nitrogen), and the liquid may be a liquid different from water.
- the gas dissolving tank 1 dissolves gas in liquid inside under pressure.
- the inside of the gas dissolving tank 1 illustrated in FIG. 1 includes a first portion 7 that is a substantially cylindrical space having a relatively large diameter, a second portion 8 that is a substantially cylindrical space having a relatively small diameter, and a third portion 9 that is a substantially truncated-cone space defined continuously between the first portion 7 and the second portion 8.
- the first portion 7 is defined above a bottom plate 11 and inside a large-diameter cylindrical section 12.
- the second portion 8 is defined below a ceiling 13 and inside a small-diameter cylindrical section 14.
- the third portion 9 is defined inside a conical cylindrical section 16 tapering from the large-diameter cylindrical section 12 and continuous with the small-diameter cylindrical section 14.
- the intake tube 6, a partition 17, and a collision section 19 are provided inside the gas dissolving tank 1.
- the partition 17 divides the inside of the gas dissolving tank 1 into an upper chamber 22 and a lower chamber 23. In the present embodiment, the partition 17 divides the first portion 7 horizontally.
- the partition 17 includes at least one connecting path 17a connecting the upper chamber 22 and the lower chamber 23. The one or more connecting paths 17a are formed off the center of the partition 17.
- the lower chamber 23 has a smaller volume than the upper chamber 22. With the effective volume of the upper chamber 22 being a part of the upper chamber 22 below a downstream end 6a of the intake tube 6, the volume of the lower chamber 23 is smaller than the effective volume of the upper chamber 22. In the first portion 7 divided horizontally by the partition 17, the part below the partition 17 has a smaller volume than the part above the partition 17. As shown in FIG. 1 , the liquid area of the lower chamber 23 is smaller than the liquid area of the upper chamber 22.
- the intake tube 6 is located to introduce a gas-liquid mixture into the gas dissolving tank 1 from outside.
- the intake tube 6 is connected to the downstream end of the suction pipe channel 2 with the pump 4.
- the intake tube 6 extends along the center axis of the gas dissolving tank 1, with an opening in the downstream end 6a opposing the center of the ceiling 13 of the gas dissolving tank 1.
- the intake tube 6 extends through the center of the bottom (the bottom plate 11) of the gas dissolving tank 1 and the center of the partition 17.
- it is desirable that the intake tube 6 has a smaller opening area at the downstream end 6a than at an upstream end 6b (refer to FIG. 4 ).
- the collision section 19 includes a protrusion-dent portion on the ceiling 13.
- the protrusion-dent portion of the collision section 19 on the ceiling 13 includes protrusions having lower ends extending further downward at positions more outward.
- the collision section 19 includes multiple members that are arranged concentrically, or specifically, a first cylindrical member 19a to a third cylindrical member 19c. In the example shown in FIG. 1 , the lower ends of the first cylindrical member 19a to the third cylindrical member 19c are located lower at positions more outward.
- the area of the ceiling 13 with the collision section 19 (the area inside the outer diameter of the third cylindrical member 19c designated by D in the example shown in FIG. 2 ) is smaller than the area of a liquid surface 20 in the gas dissolving tank 1.
- the suction pipe channel 2 has an upstream end serving as a suction port for liquid.
- the upstream end of the suction pipe channel 2 is submerged in a liquid 27 stored in a container 26 as shown in FIG. 4 .
- the pump 4 is located between the downstream end of the suction pipe channel 2 and the upstream end of the intake tube 6. Thus, when the pump 4 is driven, the liquid stored in the container 26 is drawn into the suction pipe channel 2 and pressure-fed through the intake tube 6 into the gas dissolving tank 1. The inside of the gas dissolving tank 1 is pressurized when the pump 4 is driven.
- the gas introducer 5 is located halfway along the intake tube 6.
- the gas introducer 5 mixes compressed gas fed from a compressed-gas source 28 into the liquid flowing in the intake tube 6.
- the compressed gas is fed from the compressed-gas source 28 at a pressure higher than the pressure in the suction pipe channel 2.
- the discharge pipe channel 3 has an upstream end connected to an outlet 29 in a bottom surface 1a of the gas dissolving tank 1.
- the discharge pipe channel 3 has a downstream end located in the container 26. Liquid is ejected through the downstream end with an increased dissolved gas concentration into the container 26.
- the gas dissolving tank 1 is supported by a gas dissolving tank support 31.
- the gas dissolving tank support 31 illustrated in this figure includes a housing 33 supporting the gas dissolving tank 1 and also covering the gas dissolving tank 1.
- the gas dissolving tank support 31 includes the housing 33 and a mount 34 fixed to the housing 33, and the bottom plate 11 of the gas dissolving tank 1 is, for example, bolted to the mount 34.
- the housing 33 also includes a top board 33a to which the ceiling 13 of the gas dissolving tank 1 is, for example, bolted.
- the pipes serving as the intake tube 6 and the discharge pipe channel 3 protrude downward from the mount 34 by predetermined dimensions and extend in different lateral directions through the housing 33 to the outside.
- the gas dissolving tank support 31 is movable on casters 32 at the bottom.
- the liquid is drawn from the container 26 into the suction pipe channel 2, and the gas introducer 5 mixes gas into the liquid flowing in the intake tube 6 to form a gas-liquid mixture.
- the resultant gas-liquid mixture is ejected through the downstream end 6a of the intake tube 6 into the gas dissolving tank 1.
- the gas dissolves in the liquid depending on the area of contact between the liquid and the gas and on the pressure in the gas dissolving tank 1.
- the gas area and the liquid area are defined.
- the gas-liquid mixture ejected through the downstream end 6a of the intake tube 6 first collides with the collision section 19, forming a local high-pressure part, at which the gas (air bubbles) dissolves efficiently in the liquid.
- the gas-liquid mixture colliding with the collision section 19 then passes through the gas area and reaches the liquid area.
- the area of contact between the liquid and the gas increases, thus promoting the dissolution of the gas in the liquid also in this area.
- the gas dissolving tank 1 includes the partition 17 with the connecting path 17a. With these components, air bubbles in the liquid area cannot easily be discharged through the outlet 29, and thus a larger amount of gas remains in the gas dissolving tank 1 and dissolves in the liquid. Thus, the gas dissolver 100 according to the present embodiment increases the dissolved gas concentration and the gas dissolving efficiency more easily than a known gas dissolver.
- the volume of the lower chamber 23 is smaller than the effective volume of the upper chamber 22.
- the liquid area in the upper chamber 22 may have larger capacity than the liquid area in the lower chamber 23.
- the liquid area in the upper chamber 22 containing more air bubbles is larger than the lower chamber 23 containing less air bubbles.
- the liquid area in the upper chamber 22 may have larger capacity than the liquid area in the lower chamber 23, and thus the dissolved gas concentration and also the gas dissolving efficiency are more likely to increase.
- the collision section 19 includes multiple members that are arranged concentrically, or specifically, the cylindrical members 19a to 19c.
- a collision section may include concentrically arranged curved plates 19Aa to 19Ac having different radiuses and each including two pieces.
- the curved plates 19Aa to 19Ac also have lower ends extending further downward at positions more outward.
- the collision section 19 is not limited to these two examples and may have various forms with a protrusion-dent portion on the lower surface of the ceiling 13.
- the intake tube 6 extends through the center of the bottom plate 11 of the gas dissolving tank 1 and the center of the partition 17 and along the center axis of the gas dissolving tank 1.
- the intake tube 6 may be located in other forms.
- an intake tube may extend from the outside through the side of the gas dissolving tank in a lateral direction to the inside, bend upward at the center of the gas dissolving tank, and extend along the center axis.
- the present invention is applicable to, for example, a gas dissolver that dissolves gas in liquid under pressure.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
Description
- The present invention relates to a gas dissolver that dissolves gas in liquid under pressure.
- A gas dissolver is described in, for example, Patent Literature 1. The gas dissolver described in Patent Literature 1 is a microbubble generator that generates microbubbles in a bath. The gas dissolver in this literature includes a gas dissolving tank (a gas-liquid dissolving tank in Patent Literature 1) that dissolves gas in liquid, a suction pipe channel extending from the bath to a pump for the gas dissolving tank, an intake tube (an inlet pipe channel in Patent Literature 1) extending from the pump into the gas dissolving tank, and a discharge pipe channel extending from the exit of the gas dissolving tank to the bath. A gas intake (a gas intake tube in Patent Literature 1) for introducing gas is located halfway along the suction pipe channel. The gas-liquid dissolving tank is charged with liquid to a predetermined height, thus defining a liquid area and a gas area.
- When the pump is driven, the intake tube ejects a gas-liquid mixture in the gas-liquid dissolving tank. The ejected gas-liquid mixture collides with a collision section on the ceiling of the gas-liquid dissolving tank. The collision forms a local high-pressure part, at which the gas dissolves more readily in the liquid. After colliding with the collision section, the gas-liquid mixture falls from the gas area to the liquid area, and air bubbles contained in the gas-liquid mixture enter the liquid area. After entering the liquid area, the air bubbles dissolve in the liquid while being agitated by the flow in the liquid area, and decrease in size. The air bubbles agitated by the flow in the liquid area are discharged partially through the outlet in the gas dissolving tank together with the liquid. The partial air bubbles and the liquid discharged through the outlet flow into the discharge pipe channel.
- Patent Literature 1:
Japanese Patent No. 4759553 - However, the gas dissolving tank in Patent Literature 1 cannot easily increase the dissolved gas concentration due to relatively large air bubbles flowing out in large amounts through the outlet in the gas dissolving tank, and also cannot easily increase the gas dissolving efficiency.
- In response to the above issue, one or more aspects of the present invention are directed to a gas dissolver that increases the dissolved gas concentration and the gas dissolving efficiency more easily than known structures.
- A gas dissolver according to a first aspect of the present invention includes a gas dissolving tank that dissolves gas in liquid inside, a partition dividing an inside of the gas dissolving tank into an upper chamber and a lower chamber, an intake tube to introduce a gas-liquid mixture into the gas dissolving tank from outside, and a discharge pipe channel to discharge gas dissolved liquid from the lower chamber of the gas dissolving tank. The intake tube has a downstream end with an opening extending toward a center of a ceiling of the gas dissolving tank. The partition includes a connecting path connecting the upper chamber and the lower chamber. The connecting path is off a center of the partition.
- A gas dissolver according to a second aspect of the present invention is the gas dissolver according to the first aspect in which the ceiling may include a collision section defining a protrusion-dent portion, and the intake tube may be located to cause an ejected gas-liquid mixture to collide with the collision section.
- A gas dissolver according to a third aspect of the present invention is the gas dissolver according to the second aspect in which the protrusion-dent portion may include protrusions having lower ends extending further downward at positions more outward.
- A gas dissolver according to a fourth aspect of the present invention is the gas dissolver according to any one of the first to third aspects in which the lower chamber may have a volume smaller than an effective volume of the upper chamber, where the effective volume of the upper chamber is a part of the upper chamber below the downstream end of the intake tube.
- A gas dissolver according to a fifth aspect of the present invention is the gas dissolver according to any one of the first to third aspects in which the discharge pipe channel may be connected to an outlet in a bottom surface of the gas dissolving tank, and the outlet may be off the connecting path as viewed from above.
- A gas dissolver according to a sixth aspect of the present invention is the gas dissolver according to any one of the first to fourth aspects in which the intake tube may have a smaller opening area at the downstream end than at an upstream end.
- The gas dissolver according to the above aspects of the present invention increases the dissolved gas concentration and the gas dissolving efficiency easily.
-
-
FIG. 1 is a sectional view of a gas dissolving tank in one embodiment. -
FIG. 2 is a sectional view taken along A-A inFIG. 1 . -
FIG. 3 is a diagram of a gas dissolver according to the embodiment. -
FIG. 4 is a diagram showing a liquid flow in the gas dissolver according to the embodiment. -
FIG. 5 is a diagram of a collision section in a modification, corresponding to the sectional view taken along A-A inFIG. 1 . - A gas dissolver according to one embodiment of the present invention will now be described with reference to the drawings. A gas dissolver 100 according to the present embodiment is a device for dissolving gas in liquid. The
gas dissolver 100 includes a gas dissolving tank 1, asuction pipe channel 2, adischarge pipe channel 3, apump 4, a gas introducer 5, and anintake tube 6. In the present embodiment, the gas is oxygen, and the liquid is water. The gas may be a gas different from oxygen (e.g., air, carbon dioxide, or nitrogen), and the liquid may be a liquid different from water. - The gas dissolving tank 1 dissolves gas in liquid inside under pressure. The inside of the gas dissolving tank 1 illustrated in
FIG. 1 includes afirst portion 7 that is a substantially cylindrical space having a relatively large diameter, asecond portion 8 that is a substantially cylindrical space having a relatively small diameter, and a third portion 9 that is a substantially truncated-cone space defined continuously between thefirst portion 7 and thesecond portion 8. Thefirst portion 7 is defined above abottom plate 11 and inside a large-diametercylindrical section 12. Thesecond portion 8 is defined below aceiling 13 and inside a small-diametercylindrical section 14. The third portion 9 is defined inside a conicalcylindrical section 16 tapering from the large-diametercylindrical section 12 and continuous with the small-diametercylindrical section 14. - As shown in
FIG. 1 , theintake tube 6, apartition 17, and acollision section 19 are provided inside the gas dissolving tank 1. - The
partition 17 divides the inside of the gas dissolving tank 1 into anupper chamber 22 and alower chamber 23. In the present embodiment, thepartition 17 divides thefirst portion 7 horizontally. Thepartition 17 includes at least one connectingpath 17a connecting theupper chamber 22 and thelower chamber 23. The one or more connectingpaths 17a are formed off the center of thepartition 17. - The
lower chamber 23 has a smaller volume than theupper chamber 22. With the effective volume of theupper chamber 22 being a part of theupper chamber 22 below adownstream end 6a of theintake tube 6, the volume of thelower chamber 23 is smaller than the effective volume of theupper chamber 22. In thefirst portion 7 divided horizontally by thepartition 17, the part below thepartition 17 has a smaller volume than the part above thepartition 17. As shown inFIG. 1 , the liquid area of thelower chamber 23 is smaller than the liquid area of theupper chamber 22. - The
intake tube 6 is located to introduce a gas-liquid mixture into the gas dissolving tank 1 from outside. Theintake tube 6 is connected to the downstream end of thesuction pipe channel 2 with thepump 4. In the present embodiment, theintake tube 6 extends along the center axis of the gas dissolving tank 1, with an opening in thedownstream end 6a opposing the center of theceiling 13 of the gas dissolving tank 1. Theintake tube 6 extends through the center of the bottom (the bottom plate 11) of the gas dissolving tank 1 and the center of thepartition 17. To increase the rate of the gas-liquid mixture ejected from theintake tube 6, as shown inFIG. 1 , it is desirable that theintake tube 6 has a smaller opening area at thedownstream end 6a than at anupstream end 6b (refer toFIG. 4 ). - The
collision section 19 includes a protrusion-dent portion on theceiling 13. The protrusion-dent portion of thecollision section 19 on theceiling 13 includes protrusions having lower ends extending further downward at positions more outward. In the present embodiment, thecollision section 19 includes multiple members that are arranged concentrically, or specifically, a firstcylindrical member 19a to a thirdcylindrical member 19c. In the example shown inFIG. 1 , the lower ends of the firstcylindrical member 19a to the thirdcylindrical member 19c are located lower at positions more outward. The area of theceiling 13 with the collision section 19 (the area inside the outer diameter of the thirdcylindrical member 19c designated by D in the example shown inFIG. 2 ) is smaller than the area of aliquid surface 20 in the gas dissolving tank 1. These dimensions allow liquid colliding with thecollision section 19 to fall outward in the radial direction of the gas dissolving tank 1, increasing the area of contact between the liquid and the gas and thus improving the gas dissolving efficiency. - The
suction pipe channel 2 has an upstream end serving as a suction port for liquid. In the present embodiment, the upstream end of thesuction pipe channel 2 is submerged in a liquid 27 stored in acontainer 26 as shown inFIG. 4 . - The
pump 4 is located between the downstream end of thesuction pipe channel 2 and the upstream end of theintake tube 6. Thus, when thepump 4 is driven, the liquid stored in thecontainer 26 is drawn into thesuction pipe channel 2 and pressure-fed through theintake tube 6 into the gas dissolving tank 1. The inside of the gas dissolving tank 1 is pressurized when thepump 4 is driven. - The
gas introducer 5 is located halfway along theintake tube 6. Thegas introducer 5 mixes compressed gas fed from a compressed-gas source 28 into the liquid flowing in theintake tube 6. The compressed gas is fed from the compressed-gas source 28 at a pressure higher than the pressure in thesuction pipe channel 2. - The
discharge pipe channel 3 has an upstream end connected to anoutlet 29 in abottom surface 1a of the gas dissolving tank 1. Thedischarge pipe channel 3 has a downstream end located in thecontainer 26. Liquid is ejected through the downstream end with an increased dissolved gas concentration into thecontainer 26. - In the present embodiment, as shown in
FIG. 3 , the gas dissolving tank 1 is supported by a gasdissolving tank support 31. The gasdissolving tank support 31 illustrated in this figure includes ahousing 33 supporting the gas dissolving tank 1 and also covering the gas dissolving tank 1. In detail, the gasdissolving tank support 31 includes thehousing 33 and amount 34 fixed to thehousing 33, and thebottom plate 11 of the gas dissolving tank 1 is, for example, bolted to themount 34. Thehousing 33 also includes atop board 33a to which theceiling 13 of the gas dissolving tank 1 is, for example, bolted. The pipes serving as theintake tube 6 and thedischarge pipe channel 3 protrude downward from themount 34 by predetermined dimensions and extend in different lateral directions through thehousing 33 to the outside. In the example shown inFIG. 3 , the gasdissolving tank support 31 is movable oncasters 32 at the bottom. - When the
pump 4 is driven in thegas dissolver 100 with the structure described above, the liquid is drawn from thecontainer 26 into thesuction pipe channel 2, and thegas introducer 5 mixes gas into the liquid flowing in theintake tube 6 to form a gas-liquid mixture. The resultant gas-liquid mixture is ejected through thedownstream end 6a of theintake tube 6 into the gas dissolving tank 1. - In the gas dissolving tank 1, the gas dissolves in the liquid depending on the area of contact between the liquid and the gas and on the pressure in the gas dissolving tank 1. In the
upper chamber 22 of the gas dissolving tank 1, the gas area and the liquid area are defined. The gas-liquid mixture ejected through thedownstream end 6a of theintake tube 6 first collides with thecollision section 19, forming a local high-pressure part, at which the gas (air bubbles) dissolves efficiently in the liquid. The gas-liquid mixture colliding with thecollision section 19 then passes through the gas area and reaches the liquid area. When the gas-liquid mixture falls through the gas area, the area of contact between the liquid and the gas increases, thus promoting the dissolution of the gas in the liquid also in this area. - After the gas-liquid mixture reaches the liquid area, air bubbles contained in the gas-liquid mixture are agitated by the flow in the liquid area (the flow indicated by arrows in
FIG. 1 ) and dissolved in the liquid while decreasing in size. The liquid in theupper chamber 22 moves to thelower chamber 23 through the connectingpath 17a in thepartition 17. The connectingpath 17a, which is off the center of thepartition 17, is less likely to allow air bubbles in theupper chamber 22 to move to thelower chamber 23 than in the structure with the connectingpath 17a at the center of thepartition 17 or at the outer periphery of thepartition 17. Thus, most air bubbles are likely to remain in theupper chamber 22, and most air bubbles dissolve in the liquid in theupper chamber 22 until they disappear or dissolve in the liquid as nanosized air bubbles. - After air bubbles move from the
upper chamber 22 to thelower chamber 23 through the connectingpath 17a, most of the moved air bubbles are not immediately discharged through theoutlet 29 and can again be dissolved in the liquid while being agitated by the flow of the liquid in thelower chamber 23 with theoutlet 29 positioned off the connectingpath 17a as viewed from above. - This minimizes the amount of air bubbles discharged through the
outlet 29 without being dissolved in the liquid, and the gas dissolved liquid fed through thedischarge pipe channel 3 to thecontainer 26 has a high dissolved gas concentration. In addition, the reduced amount of gas discharged through thedischarge pipe channel 3 allows higher gas dissolving efficiency. - As described above, in the
gas dissolver 100 according to the present embodiment, the gas dissolving tank 1 includes thepartition 17 with the connectingpath 17a. With these components, air bubbles in the liquid area cannot easily be discharged through theoutlet 29, and thus a larger amount of gas remains in the gas dissolving tank 1 and dissolves in the liquid. Thus, thegas dissolver 100 according to the present embodiment increases the dissolved gas concentration and the gas dissolving efficiency more easily than a known gas dissolver. - In the
gas dissolver 100 according to the present embodiment, the volume of thelower chamber 23 is smaller than the effective volume of theupper chamber 22. Thus, the liquid area in theupper chamber 22 may have larger capacity than the liquid area in thelower chamber 23. To maximize air bubbles held in the gas dissolving tank 1 without being discharged through theoutlet 29, it is desirable that the liquid area in theupper chamber 22 containing more air bubbles is larger than thelower chamber 23 containing less air bubbles. In the present embodiment, the liquid area in theupper chamber 22 may have larger capacity than the liquid area in thelower chamber 23, and thus the dissolved gas concentration and also the gas dissolving efficiency are more likely to increase. - In the embodiment described above, the
collision section 19 includes multiple members that are arranged concentrically, or specifically, thecylindrical members 19a to 19c. In a modification, as shown inFIG. 5 , a collision section may include concentrically arranged curved plates 19Aa to 19Ac having different radiuses and each including two pieces. The curved plates 19Aa to 19Ac also have lower ends extending further downward at positions more outward. Thecollision section 19 is not limited to these two examples and may have various forms with a protrusion-dent portion on the lower surface of theceiling 13. - In the embodiment described above, the
intake tube 6 extends through the center of thebottom plate 11 of the gas dissolving tank 1 and the center of thepartition 17 and along the center axis of the gas dissolving tank 1. However, theintake tube 6 may be located in other forms. For example, as shown inFIG. 5 in Patent Literature 1, an intake tube may extend from the outside through the side of the gas dissolving tank in a lateral direction to the inside, bend upward at the center of the gas dissolving tank, and extend along the center axis. - The present invention may be embodied in various other forms without departing from the spirit or the main features of the present invention. The embodiments described above are thus merely illustrative in all respects and should not be construed to be restrictive.
- The present invention is applicable to, for example, a gas dissolver that dissolves gas in liquid under pressure.
-
- 1
- gas dissolving tank
- 3
- discharge pipe channel
- 6
- intake tube
- 6a
- downstream end of intake tube
- 13
- ceiling
- 17
- partition
- 17a
- connecting path
- 22
- upper chamber
- 23
- lower chamber
- 27
- liquid
- 29
- outlet
- 100
- gas dissolver
Claims (6)
- A gas dissolver, comprising:a gas dissolving tank configured to dissolve gas in liquid inside;a partition dividing an inside of the gas dissolving tank into an upper chamber and a lower chamber;an intake tube configured to introduce a gas-liquid mixture into the gas dissolving tank from outside; anda discharge pipe channel configured to discharge gas dissolved liquid from the lower chamber of the gas dissolving tank,wherein the intake tube has a downstream end with an opening extending toward a center of a ceiling of the gas dissolving tank, andthe partition includes a connecting path connecting the upper chamber and the lower chamber, the connecting path being off a center of the partition.
- The gas dissolver according to claim 1, whereinthe ceiling includes a collision section defining a protrusion-dent portion, andthe intake tube is located to cause an ejected gas-liquid mixture to collide with the collision section.
- The gas dissolver according to claim 2, wherein
the protrusion-dent portion includes protrusions having lower ends extending further downward at positions more outward. - The gas dissolver according to claim 1 to 3, wherein
the lower chamber has a volume smaller than an effective volume of the upper chamber, where the effective volume of the upper chamber is a part of the upper chamber below the downstream end of the intake tube. - The gas dissolver according to any one of claim 1 to 3, whereinthe discharge pipe channel is connected to an outlet in a bottom surface of the gas dissolving tank, andthe outlet is off the connecting path as viewed from above.
- The gas dissolver according to any one of claims 1 to 4, wherein
the intake tube has a smaller opening area at the downstream end than at an upstream end.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2020082338 | 2020-05-08 | ||
PCT/JP2020/031529 WO2021225009A1 (en) | 2020-05-08 | 2020-08-20 | Gas dissolution device |
Publications (2)
Publication Number | Publication Date |
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EP4147770A1 true EP4147770A1 (en) | 2023-03-15 |
EP4147770A4 EP4147770A4 (en) | 2024-05-29 |
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ID=78468070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20934639.4A Pending EP4147770A4 (en) | 2020-05-08 | 2020-08-20 | Gas dissolution device |
Country Status (4)
Country | Link |
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EP (1) | EP4147770A4 (en) |
JP (1) | JP7520471B2 (en) |
CN (1) | CN115605285A (en) |
WO (1) | WO2021225009A1 (en) |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003190750A (en) | 2001-12-26 | 2003-07-08 | Yokogawa Electric Corp | Gas dissolution apparatus |
JP2006180829A (en) | 2004-12-28 | 2006-07-13 | Seiwa Pro:Kk | Apparatus for receiving fish or shellfish |
JP4374327B2 (en) | 2005-05-10 | 2009-12-02 | 大晃機械工業株式会社 | Gas dissolving device |
JP4378337B2 (en) | 2005-09-15 | 2009-12-02 | 松江土建株式会社 | Gas-liquid dissolving device |
JP4944718B2 (en) | 2007-09-12 | 2012-06-06 | ヤマハリビングテック株式会社 | Bubble generator |
JP4759553B2 (en) * | 2007-11-02 | 2011-08-31 | 三相電機株式会社 | Gas-liquid dissolution tank in microbubble generator |
KR101088145B1 (en) * | 2010-10-06 | 2011-12-02 | 이추림 | Apparatus for generating micro bubbles |
KR20120036605A (en) * | 2010-10-08 | 2012-04-18 | (주)참플러스 | Apparatus for generating micro bubbles |
JP5331238B1 (en) * | 2012-11-22 | 2013-10-30 | 環境システム株式会社 | Pressurized ozone dissolution treatment equipment |
-
2020
- 2020-08-20 JP JP2022519895A patent/JP7520471B2/en active Active
- 2020-08-20 EP EP20934639.4A patent/EP4147770A4/en active Pending
- 2020-08-20 CN CN202080100457.3A patent/CN115605285A/en active Pending
- 2020-08-20 WO PCT/JP2020/031529 patent/WO2021225009A1/en active Search and Examination
Also Published As
Publication number | Publication date |
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WO2021225009A1 (en) | 2021-11-11 |
CN115605285A (en) | 2023-01-13 |
JP7520471B2 (en) | 2024-07-23 |
JPWO2021225009A1 (en) | 2021-11-11 |
EP4147770A4 (en) | 2024-05-29 |
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