WO2014192896A1 - Procédé de production de micro-nano-bulles, générateur de micro-nano-bulles, et dispositif de production de micro-nano-bulles - Google Patents

Procédé de production de micro-nano-bulles, générateur de micro-nano-bulles, et dispositif de production de micro-nano-bulles Download PDF

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Publication number
WO2014192896A1
WO2014192896A1 PCT/JP2014/064344 JP2014064344W WO2014192896A1 WO 2014192896 A1 WO2014192896 A1 WO 2014192896A1 JP 2014064344 W JP2014064344 W JP 2014064344W WO 2014192896 A1 WO2014192896 A1 WO 2014192896A1
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Prior art keywords
liquid
micro
nano bubble
bubble generator
gas
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PCT/JP2014/064344
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English (en)
Japanese (ja)
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隆廣 久米
真朋 大松
研一 花牟礼
正好 高橋
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株式会社アースリンク
独立行政法人産業技術総合研究所
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Publication of WO2014192896A1 publication Critical patent/WO2014192896A1/fr

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    • 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
    • B01F23/232—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
    • 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

Definitions

  • the present invention relates to a micro-nano bubble generation method, a micro-nano bubble generator, and a micro-nano bubble generation device.
  • microbubbles and nanobubbles have been revealed one after another, and many micronanobubble generating devices and methods have been developed accordingly.
  • the two-phase flow swirl method is the mainstream for wastewater treatment and water environment improvement, and in tap water, microbubbles with a shape close to a Gaussian distribution with a diameter of about 30 ⁇ m are generated.
  • the number of bubbles is several tens to several hundreds as microbubbles having a diameter of 50 ⁇ m or less.
  • the bubble particle size distribution is significantly different from that of the two-phase flow swirl method, and there is a sharp and high peak in the vicinity of 10 ⁇ m in diameter, and a broad second peak centered around 40 ⁇ m in diameter is formed through a region not containing bubbles. To do.
  • the number of bubbles reaches a level of several thousand as microbubbles having a diameter of 50 ⁇ m or less.
  • ⁇ Microbubbles are bubbles that shrink in water and eventually disappear as a basic property.
  • bubbles having a diameter of 50 ⁇ m or less in a normal aqueous solution such as tap water are targeted.
  • nanobubbles In contrast, nanobubbles often target residual microbubbles. It is considered that the size of the bubbles is smaller than 1 ⁇ m and may be several tens to several hundreds of nanometers.
  • nanobubbles there are devices that have been applied for patents under the name of nanobubble generators and commercially available devices, but basically these are microbubble generators, and in order to remain as nanobubbles, they are A method of manufacturing by giving a stimulus such as crushing to microbubbles is common.
  • the use of nanobubbles includes medical care, food, sanitation, agriculture and fisheries industry, and the application purpose varies depending on the gas species contained therein.
  • microbubble generators that can be stably generated with a small-power pump, and there is a case where a considerably large amount of gas supply is required compared to the volume of microbubbles generated.
  • nanobubbles there are few devices that can easily convert microbubbles generated by one device into nanobubbles, and there is a big problem at least in terms of efficiency.
  • the present invention stably generates microbubbles with a small pump and a small amount of gas supply, and at the same time efficiently converts some of the generated microbubbles into nanobubbles in the same operation. It aims at providing the production method of a micro nano bubble, a micro nano bubble generator, and a micro nano bubble production
  • the present invention provides the following [1] to [25].
  • [1] A step of generating a gas-liquid two-phase swirl flow in a micro-nano bubble generator of a two-phase flow swirl method, and discharging the gas-liquid two-phase swirl flow into an external liquid from the discharge hole of the micro-nano bubble generator And a step of moving the released microbubbles in the gas-liquid two-phase swirl flow along the outer wall surface of the micro / nano bubble generator.
  • the step of generating the gas-liquid two-phase swirl flow changes the traveling direction of the liquid supplied from the outside to the micro / nano bubble generator along a liquid flow path formed in the micro / nano bubble generator.
  • the step of generating a swirl flow by changing the traveling direction of the liquid is a step of generating the liquid in a direction of 0 ° to 5 °, with the direction of the discharge hole being 0 ° with respect to the central axis of the discharge hole.
  • the production method of the micro nano bubble as described in one.
  • a two-phase flow swirl micronanobubble generator for generating micronanobubbles, wherein a liquid supply port for supplying a liquid, a gas supply port for supplying a gas, and a traveling direction of the supplied liquid are changed.
  • a liquid flow path, a swirl flow generating unit that generates a gas-liquid two-phase swirl flow by colliding the supplied liquid and the gas, and an outer wall, and the gas-liquid two-phase swirl flow is placed in an external liquid.
  • the micro / nano bubble generator according to [9] further including a liquid storage tank in which the supplied liquid is stored before flowing into the liquid channel.
  • Micro-nano bubble generator as described in one.
  • the liquid supply port is formed at a position where the liquid can be supplied in a direction of 0 ° to 5 °, where the direction of the discharge hole is 0 ° with respect to the central axis of the discharge hole.
  • the micro-nano bubble generator according to any one of [9] to [15], wherein the liquid is formed so that a traveling direction of the liquid can be changed in a direction of 10 ° to 90 °.
  • micro-nano bubble generator according to any one of [9] to [16], wherein the liquid channel is provided along the inner surface of the outer wall of the micro-nano bubble generator main body.
  • the outlet of the liquid channel is provided at a position farther from the discharge hole than the outlet of the gas channel.
  • the flow path forming portion having a conical end is provided at a position facing the discharge hole, and an outlet of the gas flow channel is provided at the top of the flow path forming portion.
  • the flow path forming portion has a cylindrical part on the bottom surface of the conical shape, and a slit is formed on a side surface of the cylindrical part, and the slit forms the liquid flow path together with the inner surface of the outer wall.
  • the micro-nano bubble generator according to [22] wherein the micro-nano bubble generator is formed.
  • micro-nano bubble generating apparatus comprising one or more micro-nano bubble generators according to any one of [9] to [24].
  • micro-bubbles are stably generated with a small pump and a small amount of gas supply, and at the same time, a micro-bubble that efficiently converts a part of the generated micro-bubbles into nano-bubbles in the same operation.
  • a nanobubble generating method, a micro-nano bubble generator, and a micro-nano bubble generating apparatus can be provided.
  • FIG. 2 It is a measurement result by the electron spin resonance apparatus in Example 2, and shows a spectrum of DMPO-OH.
  • the method for generating micro-nano bubbles includes a step of generating a gas-liquid two-phase swirl flow in a two-phase flow swirl micro-nano bubble generator, and the gas from a discharge hole of the micro-nano bubble generator. A step of discharging the liquid two-phase swirl flow into an external liquid; and a step of moving the discharged microbubbles in the gas-liquid two-phase swirl flow along the outer wall surface of the micro-nano bubble generator.
  • a swirl flow generated by the liquid supplied from the outside into the generator is generated in the generator.
  • the gas supplied from the outside to the swirling flow is mixed with the swirling flow to generate a gas-liquid two-phase swirling flow. It is preferable to use a micro-nano bubble generator of a two-phase flow swirl method according to an embodiment of the present invention described later.
  • the liquid supplied from the outside tap water, distilled water, ground water, river or lake water, rain water, etc. can be used, but it is not particularly limited, but it is preferable to use tap water or ground water. . Moreover, what added additives, such as a mineral, to these may be used.
  • the liquid discharged from the micro / nano bubble generator may be circulated and supplied, or a new liquid may be supplied without being circulated. Moreover, the supply amount of the liquid can be appropriately adjusted to an appropriate amount according to the performance of the pump used for each application.
  • air oxygen, nitrogen or the like
  • the amount of gas supplied may be small, preferably 1 to 30 mL / min, more preferably 3 to 20 mL / min.
  • the step of generating the gas-liquid two-phase swirl flow in the embodiment of the present invention changes the traveling direction of the liquid supplied from the outside to the micro / nano bubble generator along the liquid flow path formed in the micro / nano bubble generator. It is preferable to include a step of generating a swirling flow.
  • the step of generating the swirl flow is more preferably a step of changing along two or more liquid flow paths.
  • the two or more liquid channels are preferably formed at equal intervals in the micro / nano bubble generator, and a preferable shape thereof will be described later.
  • the above-described step of generating a swirling flow by changing the traveling direction of the liquid is not particularly limited as long as the traveling direction is changed so that the swirling flow can be generated.
  • the direction of the discharge hole is 0 °, and from the liquid supply port provided at a position parallel to the central axis, 180 ° to 180 ° It is preferable that the liquid is supplied from the ⁇ 5 ° direction to the direction of the discharge hole (0 °) or a slightly angled direction ( ⁇ 5 °), and the traveling direction is further changed to the angled direction.
  • the angle which shows the course of the liquid in this Embodiment represents the value at the time of seeing from the side surface of a micro nano bubble generator like FIG. 5B. More details will be described later with reference to the drawings.
  • the liquid supplied from the outside includes a step of flowing in the liquid flow path after being stored in the liquid storage tank formed in the micro / nano bubble generator.
  • the liquid can flow through the two or more liquid flow paths with substantially equal pressure, so that a stable swirling flow can be generated.
  • the step of generating the gas-liquid two-phase swirl flow preferably includes a step of increasing the speed of the gas-liquid two-phase swirl flow generated in the micro / nano bubble generator as it approaches the discharge hole.
  • the gas-liquid two-phase swirl flow is discharged from the discharge hole, the higher the swirl flow, the more preferable.
  • it is preferably 3000 rpm / min or more, more preferably 4000 rpm / min or more, More preferably, it is 5000 rpm / min or more.
  • discharge amount about 10 to 20 L / min, pressure: about 0.1 to 0.2 MPa
  • discharge amount about 10 to 20 L / min, pressure: about 0.1 to 0.2 MPa
  • it is preferably 4500 to 6500 rpm / min, and is preferably 5000 to 6000 rpm / min. More preferably, it is minutes.
  • the gas-liquid two-phase swirl flow is discharged from the discharge hole into the external liquid.
  • a micro-nano bubble generator of a two-phase flow swirl method according to an embodiment of the present invention described later.
  • the diameter of the discharge hole is, for example, 3 to 10 mm when a small general pump (discharge amount: about 10 to 20 L / min, pressure: about 0.1 to 0.2 MPa) is used. Preferably, it is 5 to 8 mm. The diameter is adjusted to an appropriate size according to the size of the micro / nano bubble generator.
  • the discharge hole is preferably rounded by chamfering the end of the outer wall of the micro / nano bubble generator forming the hole.
  • the external liquid it is preferable to use the same liquid as the liquid supplied from the outside.
  • the micro-bubbles in the discharged gas-liquid two-phase swirl flow The bubble is moved along the outer wall surface of the micro / nano bubble generator.
  • FIG. 2 is a cross-sectional view showing the movement of gas, liquid, and swirling flow in a micro / nano bubble generator according to an embodiment of the present invention to be described later.
  • the microbubbles in the gas-liquid two-phase swirling flow discharged from the discharge hole do not spread in the front and move in the forward direction, unlike the conventional gas-liquid two-phase swirling flow device, but in the lateral or backward direction. And move along the outer wall of the micro / nano bubble generator.
  • the characteristics of the generated bubbles also have a particle size distribution different from that of the conventional method.
  • the particle size distribution is close to a Gaussian distribution with a particle size of about 30 ⁇ m in an aqueous solution such as tap water or groundwater.
  • the present embodiment is characterized in that microbubbles exhibiting a “non-Gaussian distribution” in which a large decrease in the number of bubbles is recognized in a particle size range of 10 to 18 ⁇ m in measurement using a liquid particle counter.
  • nanobubbles having a particle size of less than 500 nm can be generated.
  • the nanobubble generation mechanism in this embodiment is considered as follows.
  • the water discharged from the discharge hole 14 includes micro bubbles having a diameter of 50 ⁇ m or less, that is, so-called micro bubbles, but within 0.1 seconds after the generation of the micro bubbles, the water containing the micro bubbles generates micro / nano bubbles. It is considered that microbubbles having a particle size of 10 to 18 ⁇ m can be stabilized as nanobubbles having a particle size of 500 nm or less because the fluid flows while tracing the wall surface of the outer wall 11c of the vessel 10 as it rotates.
  • the moving speed with respect to the wall surface is 20 cm / second or more as an average speed in a moving region within 5 mm in the vertical axis direction from the wall surface, but a different flow velocity distribution is generated in the vertical axis direction from the wall surface contact portion. This is an effect that occurs because the wall surface becomes resistance to flow, and this causes the microbubbles contained in the flow region to be rotated and rounded. Due to the different flow velocity distribution in the vertical axis direction, among the generated microbubbles, microbubbles having a small particle diameter of 20 ⁇ m or less move closer to the wall surface.
  • microbubbles with an extremely small particle size at the time of generation of 10 ⁇ m or less have difficulty because the initial interface area is too small, but microbubbles in the region of particle size 10 to 18 ⁇ m are charged at the gas-liquid interface. Accelerated concentration is realized and stabilized as nanobubbles having a particle size of 500 nm or less.
  • a rapid rounding effect is exerted particularly on microbubbles having a particle diameter in the range of 10 to 18 ⁇ m.
  • the number of these regions is reduced, resulting in a distribution different from the Gaussian particle size distribution as found in other generators.
  • microbubbles are charged, but this charge is formed due to structural factors of water at the gas-liquid interface of microbubbles. Bubbles are not charged because the structure of water in the vicinity is not in time. For this reason, microbubbles shrink while rapidly dissolving the internal gas in the surrounding water, and eventually disappear.
  • the conventional microbubble generator generates microbubbles, but the generated microbubbles disappear in the water as they are. Therefore, in order to leave a part of these as nanobubbles, it is necessary to make other measures.
  • the proportion of microbubbles having a particle size of 10 to 18 ⁇ m remaining as nanobubbles having a sustainability of less than 500 nm in diameter is extremely high without requiring such an operation. Become.
  • FIG. 1 is a cross-sectional view of a micro / nano bubble generator according to an embodiment of the present invention.
  • a micro-nano bubble generator 10 is a micro-nano bubble generator of a two-phase flow swirl type that generates micro-nano bubbles, and a liquid supply port for supplying a liquid provided in the generator body 11 11a and a gas supply port 11b for supplying gas, a liquid channel 12c for changing the traveling direction of the supplied liquid, and a swirl flow generation for generating a gas-liquid two-phase swirl flow by colliding the supplied liquid and gas And a discharge hole 14 that is provided on the outer wall 11c of the generator body 11 and discharges the gas-liquid two-phase swirl flow into the external liquid.
  • a liquid storage tank 12b that stores the supplied liquid before flowing into the liquid flow path 12c is provided.
  • the liquid flow path 12c and the liquid storage tank 12b are formed together with the gas flow path 12a in the gas-liquid flow path forming portion 12 provided at a position facing the discharge hole 14.
  • the liquid channel 12c is preferably provided along the inner surface of the outer wall 11c of the micro / nano bubble generator main body 11.
  • the generator body 11 is formed of an outer wall 11c, and has a conical part and a cylindrical part connected to the bottom surface of the conical part.
  • the inside of each part is a cavity, and the gas-liquid flow path forming part 12 is accommodated in the cavity of the cylindrical part so as not to move, and the cavity of the conical part constitutes the swirl flow generating part 13.
  • the angle of the top of the cone is preferably 20 ° to 45 °, more preferably 25 ° to 40 °, and even more preferably 25 ° to 35 ° with respect to the central axis.
  • the shape of the generator body 11 is not limited to this, and a combination of a pyramid shape and a prism shape, a conical shape, a cylindrical shape, or the like can be employed.
  • the size of the generator body 11 can be reduced to a size of about 1 to 10 cm in length, 1 to 10 cm in width, and 1 to 10 cm in length. It can be manufactured in various sizes according to the application.
  • the liquid supply port 11a is formed in the outer wall 11c (outer wall facing the discharge hole 14) located on the bottom surface of the cylindrical portion of the generator body 11, and is formed at a position where the liquid can be supplied to the liquid storage tank 12b. Has been. When the liquid storage tank 12b is not provided, the liquid storage tank 12b is formed so that the liquid can be supplied to the liquid flow path 12c. A tube or the like is connected to the liquid supply port 11a.
  • the gas supply port 11b is formed in the outer wall 11c (outer wall facing the discharge hole 14) located on the bottom surface of the cylindrical portion of the generator body 11, and is formed at a position where gas can be supplied to the gas flow path 12a.
  • a gas supply port 11 b and a gas flow path 12 a are formed on the central axis of the discharge hole 14.
  • a tube or the like is connected to the gas supply port 11b.
  • the material of the generator main body 11 and the gas-liquid flow path forming portion 12 is preferably a metal such as stainless steel, hard plastic, hard glass, or the like, but is not particularly limited.
  • the gas-liquid flow path forming unit 12 has a cylindrical portion on a conical bottom surface, and a slit is formed on a side surface of the cylindrical portion. The slit flows along with the inner surface of the outer wall 11 c of the generator body 11. A path 12c is formed.
  • the liquid channel 12c preferably extends to a conical portion of the channel forming portion 12 (the length is preferably about 3 to 20 mm, more preferably about 5 to 15 mm).
  • the angle of the top of the cone is preferably 35 ° to 70 °, more preferably 40 ° to 65 °, and still more preferably 45 ° to 65 ° with respect to the central axis.
  • the gas-liquid flow path forming part 12 is arranged so that the top of the conical portion faces the discharge hole 14, and the outlet of the gas flow path 12 a is provided at the top.
  • the outlet of the liquid channel 12c is preferably provided at a position farther from the discharge hole 14 than the outlet of the gas channel 12a.
  • the gas channel 12 a preferably has a narrower outlet than the inlet.
  • the area of the inlet of the gas flow path 12a is preferably 8 to 16 mm 2 , and more preferably 10 to 14 mm 2 .
  • the area of the outlet of the gas flow path 12a is preferably 1 to 7 mm 2 , for example, and more preferably 3 to 5 mm 2 .
  • the diameter is adjusted to an appropriate size according to the size of the micro / nano bubble generator.
  • the cavity of the swirl flow generating portion 13 becomes narrower as it approaches the discharge hole 14 (the radius of the circumference is reduced). Thus, the swirling flow increases the swirling speed as it approaches the discharge hole 14.
  • the discharge hole 14 is provided at the top of the conical portion formed by the outer wall 11c. Moreover, the edge part of the outer wall 11c which forms the discharge hole 14 is chamfered.
  • FIG. 2 is a cross-sectional view showing the movement of gas, liquid, and swirling flow in the micro / nano bubble generator according to an embodiment of the present invention to be described later.
  • the liquid supplied from the liquid supply port 11a passes through the liquid storage tank 12b, and then flows through the liquid flow path 12c.
  • the liquid flows out from the outlet of the liquid flow path 12c into the cavity of the swirl flow generating unit 13, and the swirl flow is generated.
  • Arise On the other hand, the gas supplied from the gas supply port 11b flows through the gas flow path 12a, is discharged from the outlet of the gas flow path 12a into the cavity of the swirl flow generation unit 13, collides with the liquid swirl flow, A phase swirl flow is generated.
  • the gas-liquid two-phase swirl flow increases as it approaches the discharge hole 14 and is discharged from the discharge hole 14.
  • the microbubbles in the gas-liquid two-phase swirling flow discharged from the discharge holes move while spreading in the lateral direction or the backward direction as described above, and move along the wall surface of the outer wall 11c of the micro / nano bubble generator 10. .
  • FIG. 3 is an upper perspective view of a gas-liquid flow path forming part constituting the micro / nano bubble generator according to the embodiment of the present invention
  • FIG. 4 is a lower perspective view
  • 5A is a top view
  • FIG. 5B is a side view.
  • the liquid storage tank 12b is formed in an annular shape in the gas-liquid flow path forming part 12.
  • the liquid supplied from the liquid supply port 11a is stored in the liquid storage tank 12b and then flows into the liquid channel.
  • the liquid can flow through each liquid flow path with substantially equal pressure, so that a stable swirling flow can be generated.
  • the optimal number of liquid channels depends on the size of the micro / nano bubble generator. For example, when the diameter of the micro / nano bubble generator (maximum part of the generator body) is 20 to 40 mm, it is preferable to provide 2 to 5 liquid channels 12c, more preferably 2 to 4 liquid channels 12c. More preferably.
  • the diameter of the micro / nano bubble generator is 40 to 60 mm, it is preferable to provide 2 to 6 liquid flow paths 12c, more preferably 3 to 5, more preferably 4 liquid channels 12c.
  • the diameter of the generator is 60 to 80 mm, it is preferable to provide 2 to 7 liquid flow paths 12c, more preferably 3 to 6, more preferably 4 to 5.
  • the diameter of the generator is 80 to 100 mm, it is preferable to provide 2 to 8 liquid flow paths 12c, more preferably 3 to 7, more preferably 4 to 6.
  • the plurality of liquid flow paths 12c are preferably provided at equal intervals outside the ring of the liquid storage tank 12b.
  • the liquid channel 12c preferably has a narrower outlet than the inlet, and is formed in a curved shape as shown in FIGS. 3 to 5, and becomes thinner toward the outlet, and the outlet has a sharp shape. More preferably.
  • the liquid supply port 11a is provided at a position parallel to the central axis, with the direction of the discharge hole 14 being 0 ° with respect to the central axis of the discharge hole 14, and from the direction of approximately 180 ° to the direction of the discharge hole ( 0 °) or at a position where the liquid can be supplied in a slightly angled direction ( ⁇ 5 °), and the liquid channel 12c is formed so that the traveling direction of the liquid can be changed to a more angled direction. It is preferable. Specifically, a direction of 10 ° to 90 ° is preferable, 30 ° to 90 ° is more preferable, 40 ° to 85 ° is more preferable in consideration of ease of processing and the like, and 50 ° to 80 ° is most preferable.
  • the central axis of the discharge hole 14 coincides with the central axis of the outlet (outflow hole) of the gas flow path 12a, and the liquid supplied in the direction of 0 ° is changed in course. It flows out in the direction of about 70 to 80 ° at the outlet of the channel 12c.
  • the outlet of the liquid channel 12c should not be on the line connecting the inlet of the liquid channel 12c and the outlet of the gas channel 12a.
  • the outlet is displaced by about half the diameter of the outlet.
  • the direction of shifting is unified in either the clockwise direction or the counterclockwise direction in all the plurality of liquid flow paths 12c.
  • the micro-nano bubble generating apparatus includes one or more micro-nano bubble generators 10 according to the above-described embodiments of the present invention. By providing a plurality of micro / nano bubble generators 10, it is possible to deal with the generation of a large number of micro / nano bubbles.
  • the micro / nano bubble generating apparatus includes a liquid supply pump for supplying a liquid from the liquid supply port 11a of the micro / nano bubble generator 10.
  • a pump smaller than the pump used in the ordinary two-phase flow swirling micro-nano bubble generating apparatus can be used. Since the micro / nano bubble generator 10 can also be reduced in size, the entire apparatus can be reduced in size.
  • Micro-nano bubbles were generated using the micro-nano bubble generator 10 (maximum diameter of the generator body 11: 45 mm) according to the embodiment of the present invention described in FIGS.
  • a micro pump is used using a 130 W well pump (pressure 0.16 MPa, discharge rate 14 L / min).
  • Tap water was supplied from the liquid supply port 11a of the nanobubble generator 10 (supplied by circulating water in the rectangular container). The amount of water discharged from the discharge hole 14 was about 10 L / min.
  • FIG. 6 is a photograph taken from the side of the micro / nano bubble generator in the state where the gas-liquid two-phase swirl flow is discharged from the discharge hole in the first embodiment. It can be seen that most (90% or more) of the microbubbles in the discharged gas-liquid two-phase swirl flow are moving forward and not along the wall of the outer wall 11c of the micro / nano bubble generator 10.
  • FIG. 7 shows the particle size distribution of microbubbles measured by the particle counter in liquid in Example 1, and shows the particle size distribution of microbubbles in the rectangular container when 5 minutes have passed after the micro / nano bubble generating device is operated. .
  • the amount of microbubbles generated is extremely large in spite of a very small amount of gas supply in the case of the normal two-phase flow swirl method (gas supply amount is several hundred mL / min). I understand that there are many.
  • the particle size distribution is non-Gaussian, and a large drop in the number of bubbles is observed per 10 to 18 ⁇ m.
  • Example 2 Micro-nano bubbles were produced in the same manner as in Example 1 except that tap water was left for one day and night and water from which residual chlorine was removed by 95% or more was used.
  • the micro / nano bubble generating apparatus was operated for 10 minutes, and water in the rectangular container 30 minutes after the stop was sampled.
  • DMPO 5,5-dimethyl-N-pyrroline-oxide
  • FIG. 8 shows the measurement results obtained by the electron spin resonance apparatus in Example 2, and shows the spectrum of DMPO-OH.
  • a characteristic DMPO-OH spectrum could be recognized. That is, four peaks are recognized at regular intervals between the large left and right peaks in the figure showing the manganese index. Its size is a ratio of 1: 2: 2: 1, indicating a characteristic spectrum of DMPO-OH. From this, it can be recognized that a hydroxyl radical (.OH) was generated in the system. In addition, such a spectrum is not recognized from the water before generating a micro nano bubble.
  • SYMBOLS 10 Micro nano bubble generator
  • 11 Micro nano bubble generator main body
  • 11a Liquid supply port
  • 11b Gas supply port
  • 11c Outer wall
  • 12 Gas-liquid flow path formation part
  • 12a Gas flow path
  • 12b Liquid storage Tank
  • 12c liquid flow path
  • 13 swirl flow generating section
  • 14 discharge hole

Abstract

L'invention concerne un procédé de production de micro-nano-bulles, un générateur de micro-nano-bulles, et un dispositif de production de micro-nano-bulles dans lequel des microbulles sont générées d'une manière stable malgré que la pompe soit petite et que la quantité de gaz fourni soit faible, et en même temps, quelques-unes des microbulles produites sont efficacement transformées en nanobulles dans la même action. Le présent procédé de production de micro-nano-bulles comprend une étape de production d'un écoulement tourbillonnant à deux phases gaz-liquide dans un générateur de micro-nano-bulles de type tourbillonnant à écoulement à deux phases, une étape de libération de l'écoulement tourbillonnant à deux phases gaz-liquide dans un liquide externe à partir d'un trou de libération du générateur de micro-nano-bulles, et une étape de déplacement des microbulles dans l'écoulement tourbillonnant à deux phases gaz-liquide le long de la surface de paroi externe du générateur de micro-nano-bulles.
PCT/JP2014/064344 2013-05-29 2014-05-29 Procédé de production de micro-nano-bulles, générateur de micro-nano-bulles, et dispositif de production de micro-nano-bulles WO2014192896A1 (fr)

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WO2016102701A1 (fr) * 2014-12-24 2016-06-30 Veolia Water Solutions & Technologies Support Buse optimisée d'injection d'eau pressurisée contenant un gaz dissous
CN108816035A (zh) * 2018-06-28 2018-11-16 广东名航环保技术有限公司 微纳米氧气泡协同载体生物vocs废气处理方法及系统
CN109157993A (zh) * 2018-08-24 2019-01-08 上海洁晟环保科技有限公司 一种微纳气泡产生器及产生方法
CN110479127A (zh) * 2019-07-18 2019-11-22 中国矿业大学 一种微纳米泡发生装置及生成微纳米泡的方法
CN113960038A (zh) * 2021-10-25 2022-01-21 重庆大学 Pdms光刻微纳米气泡制备方法及微纳米气泡试验方法
CN114471207A (zh) * 2020-10-26 2022-05-13 中国石油化工股份有限公司 气泡发生装置、气液鼓泡反应装置及方法
CN114733459A (zh) * 2022-04-01 2022-07-12 北京化工大学 一种非均相纳米分散体强化反应装置及方法
WO2022218636A1 (fr) 2021-04-15 2022-10-20 Messer Se & Co. Kgaa Dispositif et procédé de dispersion de gaz dans des liquides
DE102021004050A1 (de) 2021-08-05 2023-02-09 Messer Se & Co. Kgaa Vorrichtung und Verfahren zum Trennen von Fluidgemischen

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JP7190375B2 (ja) * 2018-09-13 2022-12-15 リンナイ株式会社 気液混合装置
KR102132815B1 (ko) * 2018-09-19 2020-07-21 공성욱 미세 기포 발생 장치
EP3747534A1 (fr) 2019-06-03 2020-12-09 Watermax AG Dispositif et procédé de génération de nanobulles
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CN112661278A (zh) * 2020-11-18 2021-04-16 江苏大学 一种气泡粒径可调的微纳米气泡发生器及调节方法

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CN107207287B (zh) * 2014-12-24 2021-02-02 威立雅水务解决方案与技术支持公司 用于注入含有溶解气体的加压水的优化喷嘴
CN108816035A (zh) * 2018-06-28 2018-11-16 广东名航环保技术有限公司 微纳米氧气泡协同载体生物vocs废气处理方法及系统
CN109157993B (zh) * 2018-08-24 2021-05-18 上海洁晟环保科技有限公司 一种微纳气泡产生器及产生方法
CN109157993A (zh) * 2018-08-24 2019-01-08 上海洁晟环保科技有限公司 一种微纳气泡产生器及产生方法
CN110479127A (zh) * 2019-07-18 2019-11-22 中国矿业大学 一种微纳米泡发生装置及生成微纳米泡的方法
CN114471207A (zh) * 2020-10-26 2022-05-13 中国石油化工股份有限公司 气泡发生装置、气液鼓泡反应装置及方法
CN114471207B (zh) * 2020-10-26 2023-04-07 中国石油化工股份有限公司 气泡发生装置、气液鼓泡反应装置及方法
WO2022218636A1 (fr) 2021-04-15 2022-10-20 Messer Se & Co. Kgaa Dispositif et procédé de dispersion de gaz dans des liquides
DE102021001986A1 (de) 2021-04-15 2022-10-20 Messer Austria Gmbh Vorrichtung und Verfahren zum Dispergieren von Gasen in Flüssigkeiten
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WO2023011843A1 (fr) 2021-08-05 2023-02-09 Messer Se & Co. Kgaa Dispositif et procédé pour séparer des mélanges de fluides
CN113960038A (zh) * 2021-10-25 2022-01-21 重庆大学 Pdms光刻微纳米气泡制备方法及微纳米气泡试验方法
CN114733459A (zh) * 2022-04-01 2022-07-12 北京化工大学 一种非均相纳米分散体强化反应装置及方法
CN114733459B (zh) * 2022-04-01 2023-08-08 北京化工大学 一种非均相纳米分散体强化反应装置及方法

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