WO2002002216A1 - Procede et dispositif d'alimentation de petites bulles - Google Patents

Procede et dispositif d'alimentation de petites bulles Download PDF

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Publication number
WO2002002216A1
WO2002002216A1 PCT/JP2001/005231 JP0105231W WO0202216A1 WO 2002002216 A1 WO2002002216 A1 WO 2002002216A1 JP 0105231 W JP0105231 W JP 0105231W WO 0202216 A1 WO0202216 A1 WO 0202216A1
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WO
WIPO (PCT)
Prior art keywords
liquid
cylindrical space
fluid
gas
inlet
Prior art date
Application number
PCT/JP2001/005231
Other languages
English (en)
Japanese (ja)
Inventor
Hisatsune Nashiki
Ichiro Teshiba
Original Assignee
Tashizen Techno Works Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP2000198989A external-priority patent/JP4145000B2/ja
Priority claimed from JP2000365981A external-priority patent/JP4124956B2/ja
Application filed by Tashizen Techno Works Co., Ltd. filed Critical Tashizen Techno Works Co., Ltd.
Priority to AU2001264331A priority Critical patent/AU2001264331A1/en
Publication of WO2002002216A1 publication Critical patent/WO2002002216A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23121—Diffusers having injection means, e.g. nozzles with circumferential outlet
    • 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
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2373—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media for obtaining fine bubbles, i.e. bubbles with a size below 100 µm
    • 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
    • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
    • 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
    • B01F25/10—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components
    • B01F25/102—Mixing by creating a vortex flow, e.g. by tangential introduction of flow components wherein the vortex is created by two or more jets introduced tangentially in separate mixing chambers or consecutively in the same mixing chamber
    • 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
    • B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/305—Treatment of water, waste water or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a technique for supplying microbubbles into a liquid that can be used in various fields including cleaning and activating water or other liquids.
  • Techniques for dissolving gas bubbles into a liquid include a method using a diffuser tube, a method in which air is blown into water by an injector, and a method in which a rotating body with blades is rotated near the water surface to stir the water.
  • There are various methods such as a stirring and mixing method for generating bubbles, a method for generating bubbles in water by depressurizing air-dissolved pressurized water, and a method for generating bubbles by using ultrasonic waves.
  • air bubbles are generated by discharging compressed air, which is sent from a compressor, etc., into the liquid through the micropores.However, since the compressed air expands in volume when released, ⁇ It is difficult for S to generate fine bubbles on the order of tens of microns. In addition, when actually used, clogging of micropores is apt to occur in a relatively short period of time, so that frequent maintenance is required, and the operation cost is high.
  • Japanese Patent Application Laid-Open No. 2000-4747 discloses a revolving microbubble generator 90 as shown in FIG.
  • the revolving microbubble generator 90 comprises a container body 91 having an inverted conical space 92 and a liquid tangentially formed on a part of the inner wall circumferential surface 91a of the container body 91. It comprises an inlet 93, a gas inlet 94 provided at the upper end of the container body 91, and a swirling fluid outlet 95 provided at the lower part of the container 91.
  • the vortex flow in the space 92 generates a rotating flow, and the center of the rotor is negative pressure.
  • air in the atmosphere is introduced into the container body 91 from the end 96 a of the beer tube 96 connected to the gas inlet 94 to generate fine bubbles. That is, the liquid is introduced from the liquid introduction port 93, the air is self-primed at a negative pressure from the gas introduction port 94, and fine bubbles are generated from the swirling fluid outlet 95.
  • the revolving microbubble generator 90 disclosed in Japanese Patent Application Laid-Open No. 2000-4447 is capable of shearing air introduced into a container body 91 from a gas introduction port 94 by a rotational flow of a liquid. Fine bubbles are generated by making small cuts such as twisting with force. Therefore, it is necessary to reduce the diameter of the gas vortex tube 97 formed at the center of the rotating flow to minimize the diameter of the generated bubble.
  • the inner diameter of 4 must be as small as possible. For this reason, the inner diameter of the actual gas inlet 94 is about 1 mm, and the inner diameter of the valve tube 96 connected to the gas inlet 94 is also about the same. Therefore, the amount of gas introduced into the container body 91 from the gas inlet 94 must be small, and it is difficult to supply a large amount of fine bubbles into the liquid.
  • the small-diameter vinyl tube 96 connected to the gas inlet 94 is likely to be clogged with dust near its open end 96a exposed to the outside air. Salts in the air sucked into the tube 6 stick to the inner wall of the vinyl tube 96 and cause clogging in a relatively short period of time, which is inconvenient for actual use. You.
  • cavitation erosion occurs, causing damage to the surroundings of the opening. This can render the device 90 unusable.
  • the shearing force due to the rotating flow generated in the container body 91 also acts from the side of the gas vortex tube 97 generated in the container body 91, the energy loss is large and the efficiency is low.
  • the swirling microbubble generator 90 is placed in a deep position of the liquid 98 to supply pressurized gas, when the gas supply amount increases, the gas expansion pressure increases due to the shear force of the rotating flow. It becomes strong and no fine bubbles are generated, and a phenomenon occurs in which the gas is discharged as a large diameter gas mass. In order to prevent this, it is necessary to increase the rotational flow rate generated inside the container body 91 by feeding a large amount of liquid through the container body 91. Therefore, it becomes less practical.
  • the problem to be solved by the present invention is to provide a fine bubble supply method capable of efficiently supplying a large amount of fine bubbles into a target liquid, and to be able to easily carry out this method, thereby improving workability and durability.
  • Another object of the present invention is to provide a method and an apparatus for supplying fine air bubbles which are excellent in maintainability and can be used in a wide range of fields. Disclosure of the invention
  • a first method of the microbubble supply method comprises: a cylindrical space in which a fluid can swirl; and a fluid arranged in a tangential direction of a peripheral surface of the cylindrical space to supply the fluid into the cylindrical space.
  • a microbubble generator having an inlet and a fluid outlet arranged on an extension of the central axis of the cylindrical space for allowing the fluid to flow out of the cylindrical space is immersed in the liquid, and the tube is introduced from the fluid inlet into the cylinder. It is characterized in that liquid and gas are fed into the space, a swirling flow is generated in the cylindrical space to generate fine bubbles, and a fluid containing fine bubbles is discharged from the fluid outlet into the liquid.
  • the gas and liquid swirling in the cylindrical space move due to the difference in their specific gravities due to the centrifugal force acting on the liquid and moving toward the outer periphery, and the centrifugal force acting on the gas causing the center of the rotational flow.
  • the gas is sheared and finely divided by the liquid moving in the opposite direction, is accumulated near the center of the swirling flow while being mixed with gas and liquid, and is discharged from the fluid outlet as a fluid containing fine bubbles. That is, the shearing force of the rotating flow of the liquid acts strongly on the gas from the vertical and horizontal directions, and a large amount of fine bubbles can be efficiently supplied into the target liquid.
  • the gas-liquid mixed fluid is fed from the fluid inlet into the cylindrical space, the liquid and the gas separately fed from the liquid pump and the gas pump are mixed, and the cylinder is fed from the fluid inlet.
  • the liquid is supplied into the cylindrical space, or a gas is mixed into the liquid via gas mixing means provided in the flow path of the liquid supplied from the liquid pump, and the liquid is supplied from the fluid inlet to the cylindrical space.
  • a feeding method can be adopted.
  • a decompression device called an aspirator can be used as the gas mixing means. If the aspirator is installed in the middle of a liquid supply pipe connecting the liquid pump and the fluid inlet, the aspirator can be used. The air self-sucked from the atmosphere through the liquid can be mixed with the liquid moving in the liquid supply pipe and supplied to the fluid inlet.
  • the second method of the microbubble supply method according to the present invention is characterized in that the liquid is disposed in a tangential direction of a cylindrical space in which a fluid can be swirled and a peripheral surface of the cylindrical space for supplying the liquid into the cylindrical space.
  • a microbubble generator equipped with a fluid outlet arranged on a line is immersed in the liquid, and the liquid is fed from the liquid inlet into the cylindrical space and the gas is sent from the gas inlet into the cylindrical space. It is characterized in that it supplies a swirling flow in the cylindrical space to generate fine bubbles, and discharges a fluid mixed with fine bubbles into the liquid from the fluid outlet.
  • the gas and the liquid swirling in the cylindrical space are moved in the outer peripheral direction by the centrifugal force acting on the liquid due to the difference in specific gravity, and the gas and the liquid are not swirled.
  • the centrifugal force acts and moves toward the center axis of the rotating flow, and the gas moves in the opposite direction.
  • the liquid is collected near the center of the swirling flow while being gas-liquid mixed, and is released as a fluid containing fine bubbles from the fluid outlet, so that a large amount of fine bubbles are contained in the target liquid. It can be supplied efficiently.
  • a first device of the microbubble generating device comprises a cylindrical space in which a fluid can be swirled, and a fluid arranged in a tangential direction of a peripheral surface of the cylindrical space to supply the fluid into the cylindrical space.
  • a microbubble generator having an inlet and a fluid outlet arranged on an extension of the central axis of the cylindrical space for allowing fluid to flow out of the cylindrical space; And a liquid supply means and a gas supply means for supplying a liquid and a gas.
  • the fluid acts as a shear due to the dynamic pressure energy of the rotating flow, and is further miniaturized and accumulated at the center of the rotating flow, and is discharged as a fluid containing fine bubbles from the fluid outlet. That is, since the shearing force of the rotational flow of the liquid acts on the gas in the vertical and horizontal directions with respect to the moving direction of the gas, a large amount of fine bubbles can be efficiently supplied into the target liquid.
  • a large amount of fine bubbles can be supplied to the fine bubble generator immersed in the target liquid simply by mixing and feeding the liquid and gas by the liquid supply means and the gas supply means, It generates and discharges fine bubbles using the centrifugal force, centripetal force and shearing action of the swirling flow, so it is excellent in workability, durability and maintenance, and can be used in a wide range of fields.
  • a gas-liquid mixture in which a gas and a liquid are mixed in advance to the fine bubble generator, the contact time between the gas and the liquid can be lengthened, and the liquid being sent can be supplied. Being pressurized, the gas dissolves in the liquid. Since the degree of resolution increases, the gas can be dissolved in the liquid even during the feeding process.
  • the gas-liquid mixed fluid is fed from the fluid inlet into the cylindrical space, as described above, the liquid and the gas separately fed from the liquid pump and the gas pump are mixed.
  • the liquid is fed into the cylindrical space from the fluid inlet, or the gas is mixed into the liquid through a gas mixing means connected to the flow path of the liquid fed by the liquid pump, and the liquid is introduced from the fluid inlet.
  • a gas mixing means a decompression device called an aspirator can be suitably used as the gas mixing means.
  • a second device of the microbubble supply device includes a cylindrical space in which a fluid can be swirled, and a liquid arranged in a tangential direction of a peripheral surface of the cylindrical space to supply the liquid into the cylindrical space.
  • a microbubble generator having a fluid outlet, liquid supply means for supplying liquid into the cylindrical space via the liquid inlet, and gas into the cylindrical space via the gas inlet. And a body feeding means for feeding air.
  • the microbubble generator is disposed at a position where relatively high hydraulic pressure is applied, for example, at a position deeper than a water depth of 10 m. Even in such a case, since the gas can be sent to the bubble generator as it is, fine bubbles can be stably generated regardless of the level of the liquid pressure.
  • a gas-liquid mixed fluid, liquid or gas From a plurality of locations into the cylindrical space and generate a stable swirling flow in the cylindrical space, so that fine bubbles can be generated more efficiently and stably. Can be supplied.
  • the stability of the swirling flow can be ensured even when the cylindrical space is increased in the axial direction, it is possible to further improve the efficiency of supplying fine bubbles by increasing the size of the fine bubble generator.
  • the rotary type disclosed in Japanese Patent Application Laid-Open No. 2000-4747 is disclosed.
  • a one-sided opening method such as a microbubble generator
  • the energy flow due to the friction between the swirling flow in the cylindrical space and the inner wall surface at the end of the cylindrical space is reduced, and the microbubbles from multiple fluid outlets Since the mixed fluid can be discharged, the supply efficiency of the fine bubbles is further improved.
  • cavitation generated along the central axis of the cylindrical space due to the swirling flow does not contact the inner wall surface of the cylindrical space, no cavitation erosion occurs and the durability of the entire apparatus is reduced. It can be improved and maintenance can be simplified.
  • the fluid and the liquid fed toward the cylindrical space can be reduced. Since the pressure is reduced at the section and the pressure is increased and the pressure is increased, and is jetted into the cylindrical space, a high-speed swirling flow is formed in the cylindrical space, and fine bubbles can be supplied more efficiently.
  • a relatively large diameter fluid supply pipe or liquid supply pipe can be used as a means for supplying a fluid or liquid to the fluid introduction port or the liquid introduction port. The energy loss can be reduced, and the efficiency of supplying fine bubbles can be further improved.
  • FIG. 1 is an overall configuration diagram showing a fine bubble supply device of the first embodiment.
  • FIG. 2 is a front view of a bubble generator included in the fine bubble supply device of FIG.
  • FIG. 3 is a side view of the bubble generator of FIG.
  • FIG. 4 is a cross-sectional view taken along the line ⁇ ⁇ ⁇ ⁇ in FIG.
  • FIG. 5 is a sectional view taken along line BB in FIG.
  • FIG. 6 is a diagram illustrating a state of generation of a swirling flow in the bubble generator.
  • FIG. 7 is a diagram showing a state of generation of fine bubbles in the bubble generator.
  • FIG. 8 is a diagram showing a state of generation of fine bubbles in the bubble generator.
  • FIG. 9 is a partially enlarged view of the vicinity of the fluid outlet in FIG.
  • FIG. 10 is a sectional view showing another embodiment of the bubble generator.
  • FIG. 11 is an overall configuration diagram showing the fine bubble supply device of the second embodiment.
  • FIG. 12 is a perspective view showing a bubble generator constituting the microbubble generator of the third embodiment.
  • FIG. 13 is a sectional view taken along line C-C in FIG.
  • FIG. 14 is a sectional view taken along line DD in FIG.
  • FIG. 15 is a diagram showing the structure of a conventional bubble supply device. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is an overall configuration diagram showing a fine bubble supply device according to a first embodiment of the present invention
  • FIG. 2 is a front view of a bubble generator constituting the fine bubble supply device shown in FIG. 1
  • FIG. 3 is the bubble generator.
  • 4 is a sectional view taken along line AA in FIG. 3
  • FIG. 5 is a sectional view taken along line BB in FIG.
  • the microbubble supply device 10 of the present embodiment includes a fluid supply device 11 disposed on the ground, a bubble generator 12 to be injected into the target liquid L, and a suction unit. 13, a pressure feed pipe 15 connecting the fluid supply device 11 and the bubble generator 12, a suction pipe 17 connecting the fluid supply device 11 and the suction part 13, and the like.
  • the fluid supply device 11 includes a liquid pump 21 for pumping the target liquid L sucked through the suction part 13 and the suction pipe 17 to the bubble generator 12 via the pressure feeding pipe 15, And a gas mixing device 23 that mixes the air sucked from the liquid into the target liquid L to be sent to the bubble generator 12 under pressure.
  • the gas mixing device 23 has a configuration in which an air compressor 24, an air pressure adjusting valve 25, and a pressure gauge 26 are communicated with an air supply pipe 27, and the air supply pipe 27 is connected to the pressure supply pipe 15.
  • the air pressure regulating valve 25 regulates the supply amount of compressed air generated by the air compressor 24. It is an air pressure adjusting means for adjusting the air pressure and functions as a bubble size adjusting means for changing the size of fine bubbles generated in the bubble generator 12.
  • the liquid pump 21 and the air compressor 24 When the liquid pump 21 and the air compressor 24 are operated, the liquid pump 21 sucks the target liquid L through the suction part 13 and the suction pipe 17 and sends the sucked target liquid L to the pressure feeding pipe 15. At the same time, the air compressor 24 sends air sucked from the atmosphere into the target liquid L moving through the pressure feed pipe 15 through the air supply pipe 27, so that the target liquid L and air are The mixed fluid is sent to the bubble generator 12 via the pressure feed pipe 15. The mixed fluid of the target liquid L and air sent to the bubble generator 12 is converted into a mixed fluid of the fine bubbles and the target liquid L in the bubble generator 12 through a swirling process described later.
  • the bubble generator 12 constituting the fine bubble supply device 10 is formed of a synthetic resin or the like, has an outer shape of a rectangular parallelepiped, and has a peripheral wall portion 14 and the peripheral wall portion 1. 4 and a lid 16 integrally formed at both ends, and has a cylindrical space S in which liquid and gas can both swirl.
  • two fluid inlets 18 for introducing a mixed fluid of liquid and air into the space S are provided in communication with the cylindrical space S. These fluid inlets 18 are formed by joining hollow cylinders 20 projecting outward from the peripheral wall portion 14, and the fluid inlets 18 are formed on the circumferential surface of the cylindrical space S. They are communicated in the same direction as the tangential direction. Further, the two fluid introduction ports 18 are provided at symmetrical positions with respect to the central longitudinal section 19 of the axial length of the cylindrical space S.
  • Fluid outlets 22 are provided at the center of the lids 16 at both ends of the bubble generator 12, that is, on the extension of the center axis X—X of the cylindrical space S. These fluid outlets 22 are all circular, have the same opening area, and are provided symmetrically with respect to the center longitudinal section 19 of the space S.
  • the fluid outlet 22 serves as a path for discharging the gas-liquid mixed fluid swirling in the bubble generator 12 together with the fine bubbles generated therein into the target liquid L outside. The fine particles released from the bubble generator 12 via the fluid outlet 22 The target liquid L containing fine bubbles is immediately diffused into the target liquid L around the bubble generator 12.
  • the gas-liquid mixed fluid is injected from the tangential direction of the peripheral surface of the cylindrical space S, and the high-speed swirl inside the bubble generator generates fine bubbles. It is not necessary to reduce the diameter of the fluid introduction port 18 in correspondence with the above. For example, the diameter may be set to about 1 cm.
  • the size of the microbubbles generated in the bubble generator 12 varies depending on the amount of air sent from the air compressor 24 to the pressure pipe 15.
  • an air pressure adjusting valve 25 is provided as a means for continuously or selectively changing the increase and decrease of the air amount.
  • the bubble generating mechanism in the bubble generator 12 will be described in detail with reference to FIGS.
  • the gas-liquid mixed fluid pumped from the fluid inlet 18 into the bubble generator 12 has a central axis connecting the centers of the fluid outlets 22 of the lids 16 at both ends, That is, a gas-liquid swirl flow 29 that rotates at high speed around the central axis X—X of the cylindrical space S or in the vicinity thereof is formed, and the gas-liquid swirl flow 29 is directed toward the middle part of the bubble generator 12. It is divided into an intermediate swirling flow 30 that moves once while swirling, and an end swirling flow 31 that moves while swirling toward both ends of the bubble generator 12.
  • the intermediate swirling flow 30 moves while swirling toward the central longitudinal section 19 of the bubble generator 12, and the direction of movement is reversed at the central longitudinal section 19 where these collide, and the central axis X— It moves in the vicinity of X toward the fluid outlet 22 direction. After the reversal, the intermediate swirling flow 30 moving around the central axis X—X merges with the end swirling flow 3 1 immediately before the fluid outlet 22 to become a swirling flow 32 and the fluid outlet 2 Released from 2 out.
  • the gas-liquid mixed fluid including the intermediate swirling flow 30 and the end swirling flow 31 that swirl at high speed in the bubble generator 12 is subjected to the central axis X— by centrifugal force.
  • the swirling cavity 28 compressed by X toward the inner wall side of the bubble generator 12 and having a negative pressure by the action of centrifugal force is generated along the vicinity of the central axis XX.
  • the gas in the intermediate swirling flow 30 and the end swirling flow 31 is filled with fine bubbles in the swirling cavity 28 in the negative pressure state by boiling under reduced pressure, that is, the gasification phenomenon of the dissolved gas due to the reduced pressure. Appears as 3 3.
  • Fine bubbles 3 3 is accompanied by the flow of the intermediate swirling flow 30 and the end swirling flow 31, and finally, along with the swirling flow 32, from the fluid outlets 22 on both sides of the bubble generator 12. Released into target liquid L.
  • a gas-liquid mixture flowing at high speed in the bubble generator 12 has a centripetal force on the gas due to the difference in specific gravity of the gas and liquid, and a centrifugal force on the liquid.
  • the liquid moves outside the swirl flow 32 and the gas moves toward the center of the swirl flow 32.
  • the gas contained in the gas-liquid mixed fluid flowing into the bubble generator 12 from the fluid inlet 18 becomes small bubbles while being sheared by the action of the swirling flow, and becomes the central axis X of the swirling flow 32 — Accumulates in the swirling cavity 28 near X and moves toward the fluid outlet 22 while swirling at high speed.
  • the swirling speed of the swirling flow 32 becomes faster at the fluid outlet 22 having a smaller inner diameter than the space S in the bubble generator 12, and near the boundary between the bubble generator 12 and the fluid outlet 22, A shear force is generated due to the difference in turning speed.
  • the bubbles become finely divided micro bubbles 33 by the above-described compressive force and shear force.
  • the swirling cavity 28 generated in the bubble generator 12 during use of the fine bubble supply device 10 is caused by the inner wall surface of the bubble generator 12 and the flow. Since there is no contact with the inner peripheral surface of the body outlet 22, no cavitation erosion occurs, the durability of the entire apparatus is excellent, and maintenance can be simplified.
  • the above-mentioned air pressure adjusting valve 25 is adjusted to change the amount of compressed air supplied to the pressure feed pipe 15 within a range where the pressure in the bubble generator 12 does not become a positive pressure. Thereby, the size of the generated fine bubbles can be finely adjusted.
  • the fine bubble supply device 10 since the gas-liquid mixed fluid is supplied to the bubble generator 12 via one pressure supply tube 15, a long air supply tube or the like is required. It is unnecessary, piping and handling are easy, and there is no risk of clogging the air supply pipe.
  • microbubbles can be continuously and stably supplied into the target liquid L to increase the amount of dissolved oxygen, purify water, promote the growth of cultured animals and plants, and activate water.
  • a circulating flow can be generated in the closed water area.
  • the application of the microbubble supply device 10 of the present embodiment is not particularly limited.
  • microbubbles are supplied into a target liquid such as a liquid for growing animals and plants, water to be treated before water purification, and dam lake water. It can be used in various fields.
  • the space S in the bubble generating section 12 may be any shape as long as the liquid and the gas can be swirled, and is not limited to a cylindrical shape, but may be a polygonal cylinder such as a square cylinder, a pentagonal cylinder, or a hexagonal cylinder. It can be in shape.
  • a polygonal cylinder a liquid that supplies fine bubbles by generating high-frequency sound waves or ultrasonic waves due to the vibration generated by collision with the wall surface when a mixed fluid of liquid and gas turns at high speed in space It also has the effect of removing the contents contained in it, so it is also effective in detoxifying harmful substances.
  • FIG. 10 shows another embodiment of the bubble generator. In FIG. 10, members having the same functions as those of the bubble generator 12 of FIG.
  • a reduced diameter portion 18a smaller in diameter than the fluid introduction port 18 is provided at the open end of the fluid introduction port 18 facing the cylindrical space S.
  • the gas-liquid mixed fluid sent toward the space S is accelerated and increased in pressure by being constricted by the reduced diameter portion 18a, and is ejected into the space S, and high-speed gas-liquid swirl into the space S Since the stream 29 is formed, fine bubbles can be generated more efficiently.
  • FIG. 11 is an overall configuration diagram showing a fine bubble supply device according to a second embodiment of the present invention.
  • members having the same functions as those of the microbubble supply device of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.
  • an aspirator 39 which is one of the decompression devices, is attached in the middle of a pressure feed pipe 15 connecting the liquid pump 21 and the bubble generator 12.
  • FIG. 12 is a perspective view showing a bubble generator constituting a fine bubble supply device according to a third embodiment of the present invention
  • FIG. 13 is a cross-sectional view taken along line CC of FIG. 12
  • FIG. FIG. 3 is a sectional view taken along line D-D in FIG.
  • members having the same functions as those of the bubble generator of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
  • the bubble generator 50 constituting the fine bubble supply device of the present embodiment has a rectangular parallelepiped outer shape similar to the bubble generator 12 of the first embodiment, and has a peripheral wall portion 14 and a peripheral wall portion 14. It consists of a lid 16 integrally formed at both ends, inside which both liquid and gas are present. It has a revolvable cylindrical space S.
  • the peripheral wall 14 has two liquid inlets 51 for introducing liquid into the space S and two gas inlets 52 for introducing gas into the space S, each of which communicates with the space S. It is provided.
  • the liquid inlet 51 is formed by joining the hollow cylinder 53 to the peripheral wall portion 14, and the gas inlet 52 is formed by joining the hollow cylinder 54 to the peripheral wall 14.
  • the liquid inlet 51 is provided in the same direction as the tangential direction of the circumferential surface of the cylindrical space S, and the gas inlet 52 is provided in a direction orthogonal to the central axis XX of the space S.
  • the two liquid introduction ports 51 and the gas introduction ports 52 are provided at symmetrical positions with respect to the central longitudinal section 19 of the axial length of the cylindrical space S.
  • the microbubble supply device 10 described as the first embodiment was used in a fish farm (area 10, OOO m 2 , water depth 6 m, water depth 5.5 m). 7_ A bubble generator 12 is placed in the water in the tank, and the liquid pump 21 (AC 100 V, 200 W) of the fluid supply device 11 and the bubble generator 12 are salted. The suction part 13 connected with the pressure pipe 15 made of vinyl and connected via the suction pipe 17 with the liquid pump 21 is placed in water.
  • the liquid pump 21 Activate the liquid pump 21 and send the water sucked from the suction part 13 to the bubble generator 12
  • the compressed air supplied from the compressor 24 AC 100, 750 W, discharge pressure 8 kgf / cm 2
  • the air supply pipe 27 is Microbubbles are generated by the bubble generator 12 by being fed into the pumping tube 15 through the airbag.
  • the bubble generator 50 described as the third embodiment is immersed in a biotope pond (area 20 m 2 , water depth 6 m) in a still water area, and only liquid is supplied from the liquid inlet 51 using a liquid pump. The air was sent into the space S, and the air was sucked into the space S from the gas inlet 52 through the gas supply tube to generate fine bubbles in the bubble generator 50.
  • the present invention can be used in various fields including cleaning and activating water and other liquids.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Nanotechnology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

L'invention concerne une technique d'alimentation de petites bulles, capable d'alimenter efficacement une grande quantité de petites bulles à un liquide objet. Le dispositif d'alimentation de petites bulles (10) comprend une alimentation de fluide (11), un générateur de bulles (12) et une partie d'aspiration (13) qui sont immergés dans le liquide objet (L), un conduit à pression (15) qui relie l'alimentation de fluide (11) et le générateur de bulles (12), et un conduit d'aspiration (17) qui relie l'alimentation de fluide (11) et la partie d'aspiration (13). L'alimentation de fluide (11) comprend une pompe à liquide (21) servant à alimenter le liquide objet (L) aspiré de la partie d'aspiration (13) au générateur de bulles (12) via le conduit à pression (15), et un mélangeur de gaz (32) destiné à mélanger l'air dans le liquide objet (L) pompé et transmis au générateur de bulles (12).
PCT/JP2001/005231 2000-06-30 2001-06-19 Procede et dispositif d'alimentation de petites bulles WO2002002216A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001264331A AU2001264331A1 (en) 2000-06-30 2001-06-19 Method and device for feeding fine bubbles

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000198989A JP4145000B2 (ja) 2000-06-30 2000-06-30 微細気泡供給装置
JP2000-198989 2000-06-30
JP2000-365981 2000-11-30
JP2000365981A JP4124956B2 (ja) 2000-11-30 2000-11-30 微細気泡供給方法および微細気泡供給装置

Publications (1)

Publication Number Publication Date
WO2002002216A1 true WO2002002216A1 (fr) 2002-01-10

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PCT/JP2001/005231 WO2002002216A1 (fr) 2000-06-30 2001-06-19 Procede et dispositif d'alimentation de petites bulles

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AU (1) AU2001264331A1 (fr)
WO (1) WO2002002216A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006000170A1 (fr) * 2004-06-26 2006-01-05 Fan Separator Gmbh Dispositif pour produire des microbulles
EP2020260A1 (fr) * 2006-05-23 2009-02-04 Marubeni Corporation Appareil générateur de fines bulles d'air
CN102606164A (zh) * 2012-04-13 2012-07-25 大连华氏流体设备有限公司 一种盾构机泡沫注射***及其工作方法
CN103749184A (zh) * 2013-11-07 2014-04-30 梁振成 一种高密度种植的养液供应***结构
CN107827187A (zh) * 2017-11-06 2018-03-23 深圳市长天长空智能设备科技有限公司 一种泥水界面纳米气浮机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5321804Y1 (fr) * 1972-03-25 1978-06-07
JPS54143866U (fr) * 1978-03-31 1979-10-05
JPH06190255A (ja) * 1992-12-25 1994-07-12 Tonen Corp 気体・液体混合装置
JPH10230150A (ja) * 1997-02-17 1998-09-02 Nittetsu Mining Co Ltd エアレータ
JP2001038180A (ja) * 1999-07-28 2001-02-13 Toyo Seigyo:Kk 気体の液体への混合装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5321804Y1 (fr) * 1972-03-25 1978-06-07
JPS54143866U (fr) * 1978-03-31 1979-10-05
JPH06190255A (ja) * 1992-12-25 1994-07-12 Tonen Corp 気体・液体混合装置
JPH10230150A (ja) * 1997-02-17 1998-09-02 Nittetsu Mining Co Ltd エアレータ
JP2001038180A (ja) * 1999-07-28 2001-02-13 Toyo Seigyo:Kk 気体の液体への混合装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006000170A1 (fr) * 2004-06-26 2006-01-05 Fan Separator Gmbh Dispositif pour produire des microbulles
EP2020260A1 (fr) * 2006-05-23 2009-02-04 Marubeni Corporation Appareil générateur de fines bulles d'air
EP2020260A4 (fr) * 2006-05-23 2012-11-28 Marubeni Kk Appareil générateur de fines bulles d'air
CN102606164A (zh) * 2012-04-13 2012-07-25 大连华氏流体设备有限公司 一种盾构机泡沫注射***及其工作方法
CN103749184A (zh) * 2013-11-07 2014-04-30 梁振成 一种高密度种植的养液供应***结构
CN107827187A (zh) * 2017-11-06 2018-03-23 深圳市长天长空智能设备科技有限公司 一种泥水界面纳米气浮机

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