Classifications

• • 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
  • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
  • B01F23/2326—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles adding the flowing main component by suction means, e.g. using an ejector
• • 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
  • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
  • B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F21/00—Dissolving
  • B01F21/20—Dissolving using flow mixing
• • 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
  • B01F23/2375—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 for obtaining bubbles with a size below 1 µm
• • 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
  • B01F23/2376—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 characterised by the gas being introduced
  • B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
  • B01F23/237612—Oxygen
• • 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
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
  • B01F25/3124—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow
  • B01F25/31242—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof characterised by the place of introduction of the main flow the main flow being injected in the central area of the venturi, creating an aspiration in the circumferential part of the conduit
• • 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
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
• • 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
  • B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating flow
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
  • B01F35/71—Feed mechanisms
• • 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
  • B01F2101/48—Mixing water in water-taps with other ingredients, e.g. air, detergents or disinfectants

Definitions

• the present invention relates to a method for dissolving a gas in a water stream.
• Patent Document 1 discloses a gas dissolving device in which carbon dioxide gas stored in a gas cylinder is supplied to a collision section that generates fine bubbles.
• Patent Document 2 discloses a method for dissolving a gas in water under pressure. In all of the gas dissolving methods described in these prior art documents, pressurized gas is supplied to a water flow.
• a method for dissolving a gas in a water stream comprising the steps of: A gas dissolving method in which a part of the water constituting the water flow is made into a negative pressure region, the gas is sucked in by the negative pressure of the negative pressure region, the gas is entrained in the water flow, and fine bubbles are generated.
• the negative pressure in the negative pressure region draws in gas from the gas supply source, and the gas is entrained in the water flow.
• a sufficient amount of gas is drawn into the negative pressure region without pressurizing the gas to be introduced. If the gas to be introduced is pressurized, the gas suction efficiency is improved.
• the negative pressure region of the water flow a part of the water is gasified (vaporized).
• the water vapor in the negative pressure region and the gas are mixed. Then, as the pressure of the part of the water flow that escapes from the negative pressure region increases, the water vapor condenses and returns to water. At this time, the gas is taken up into the water and becomes dissolved.
• the second aspect of the present invention is defined as follows: That is, in the method of the first aspect, The gas is drawn into the negative pressure region at atmospheric pressure. In order to produce oxygen industrially and inexpensively, an adsorption separation method is generally adopted, and the oxygen produced by such a method is not pressurized. In other words, even if the oxygen is not pressurized and is taken out from an adsorption separation device as an oxygen source, it can be dissolved in water as it is, that is, at atmospheric pressure, according to the second aspect.
• the third aspect of the present invention is defined as follows:
• the water flow flows inside a tube, and the tube is provided with a vertical downstream wall facing the downstream side of the water flow, and the water flow wraps around the downstream wall to form the negative pressure region.
• the gas dissolving method of the third aspect defined in this way the water flow that has traveled around the downstream wall moves away from the center of the cylinder and forms a negative pressure region on the outer periphery of the cylinder. It becomes easier to supply gas to such a negative pressure region from outside the cylinder.
• Patent Document 4 explains that fine bubbles containing nano-sized microscopic bubbles are formed in the water by passing water through a tube with a vertical downstream wall (see Figures 4 and 5).
• the barrel has an orifice at its outlet, and a vertical downstream wall is formed.
• the fourth aspect of the present invention is defined as follows:
• a recess is formed in the downstream wall, and a part of the water flow that has flowed around the recess is vaporized by the negative pressure of the recess.
• the negative pressure becomes extremely large in the recess formed in the downstream wall. According to the investigations of the present inventors, the pressure changes (oscillates) in the recess, and the water is almost vaporized at the maximum negative pressure.
• the gas supplied to the negative pressure region When the gas supplied to the negative pressure region is guided by the water flow and reaches the recess, it is drawn into the recess by the large negative pressure and mixes with the water vapor in the recess.
• the negative pressure in the vibrating recess decreases (when it returns to water), the gas is drawn into the water along with the water vapor.
• the gas can be delivered directly to the recess.
• the pressure oscillation in the recess also has the effect of stirring the water flow, which also improves the gas dissolution effect.
• the seventh aspect of the present invention is defined as follows: 1.
• An apparatus for dissolving a gas into a water flow from a water flow source comprising: The gas supply source and the dissolving unit are provided, The dissolving part is A tube through which the water flow from the water flow source passes;
• the cylinder includes a vertical downstream wall facing the downstream side of the water flow, the water flow flows around the downstream wall to form a negative pressure region, and a gas supply path extending from the peripheral wall of the cylinder to the negative pressure region is provided, the gas supply path being connected to a gas supply source.
• the gas from the gas supply source is supplied to the negative pressure region through the gas supply path by the negative pressure of the negative pressure region.
• the recess can be extended up to the peripheral wall of the tube (aspect 10). By extending the recess up to the peripheral wall of the tube, a lid is placed over a portion of the recess. According to the inventors' investigations, evaporation of water is promoted in the recess in the portion that is covered with the lid.
• fine bubbles are efficiently generated in the water flow, as described in Patent Document 4.
• fine bubbles include nano-order microbubbles.
• the gas may be one or more selected from inorganic gases such as air, oxygen, ozone, ammonia, and nitrogen, and organic gases such as carbon dioxide and ethane.
• the gas dissolving device 1 comprises a gas supply source 10 , a water flow source 100 and a dissolving section 500 .
• An adsorption separation type oxygen generator was used as the gas supply source 10.
• the oxygen output from this oxygen generator was at atmospheric pressure.
• Any gas that should be dissolved in the water flow can be selected as the type of gas supplied by the gas supply source 10.
• a tank or cylinder of such gas can be used as the gas supply source 10.
• the atmosphere can also be used as the gas source.
• the air bubble generating device 1000 is sandwiched and built in between the upstream portion 610 and the downstream portion 630.
• Fig. 2 is a side view of the air bubble generating device 1000.
• Fig. 1 is a cross section indicated by the cross section indication line AA in Fig. 2.
• the air bubble generating device 1000 includes a main body 1100 and an air bubble generating unit 1200 .
• the slits 1300 are formed radially in a plan view.
• the center of the radiation coincides with the central axis of the main body 1100.
• the center of the radiation does not have to coincide with the central axis of the main body 1100.
• the slits 1300 are formed on one imaginary cross section in the main body 1100.
• the portion that bulges most from the inner peripheral surface of the main body 1100 is formed on the imaginary cross section. It is preferable that this most bulging portion coincides with the periphery of the bottom surface 1211 of the column 1210.
• the bottom surface 1211 is formed at a right angle or at an acute angle to the water flow direction at the most bulging portion, because this can cause a large change in the flow rate and generate negative pressure there.
• the outlet of the orifice 2220 is open, and the downstream wall 2240 that defines the expanded diameter portion 2230 rises perpendicular to the water flow.
• Four recesses 2250 are formed at 90 degree intervals in the downstream wall 2240.
• the expanded diameter portion 2230 is formed with a recess 2231 in the circumferential direction.
• the orifice 2220 refers to a portion of the cylindrical main body that has a constant diameter but is reduced in diameter. The diameter can be changed or a groove can be formed in the peripheral wall within a range that does not cause turbulence in the water flow.
• FIG. 7 shows the change over time in the dissolved oxygen concentration in the water thus obtained, in which oxygen has been dissolved.
• the results in Fig. 7 show that the oxygen concentration decay behavior is the same as that of oxygen-dissolved water produced by a conventional gas dissolution device that involves pressurization. This shows that the oxygen dissolution device of the present invention is suitable for energy saving because it does not require external energy such as pressurization or stirring when dissolving oxygen (excluding the energy required to feed water).

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Nanotechnology (AREA)
• Accessories For Mixers (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

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ID=94375413

Family Applications (1)

Country Status (5)

Citations (13)

• 2024
  • 2024-07-24 JP JP2024569716A patent/JP7725118B2/ja active Active
  • 2024-07-24 WO PCT/JP2024/026520 patent/WO2025023285A1/ja active Pending
  • 2024-07-24 KR KR1020257034558A patent/KR20250168356A/ko active Pending
  • 2024-07-24 CN CN202480027639.0A patent/CN121001811A/zh active Pending
  • 2024-07-24 EP EP24845660.0A patent/EP4681806A1/en active Pending
• 2025
  • 2025-07-30 JP JP2025127061A patent/JP2025160387A/ja active Pending

Patent Citations (16)

Non-Patent Citations (1)

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