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
  • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
• • 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
  • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
  • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
  • B01F23/23363—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced above the stirrer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
  • B01F27/93—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with rotary discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
  • B01F33/80—Mixing plants; Combinations of mixers
  • B01F33/82—Combinations of dissimilar mixers
  • B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
  • B01F33/80—Mixing plants; Combinations of mixers
  • B01F33/834—Mixing in several steps, e.g. successive steps

Definitions

• the present invention is in the field of devices for the production of small diameter bubbles in a liquid.
• small diameter bubble means a bubble with a diameter of less than 5 mm.
• mini-bubbles in a liquid finds a large number of applications.
• mini-bubbles aims at ensuring a homogeneous mixture of liquids or solid particles in a liquid.
• the present invention aims in particular to solve the aforementioned problems. It relates to a device for the production of mini-bubbles as defined in claim 1.
• the mixing space constitutes a first place for the formation of bubbles.
• the bubbles have characteristics fairly close to those produced with the devices of the prior art.
• the second area where bubbles form in contact with the gas-liquid mixture is the bubbles.
• the bubbles formed in the mixing space undergo a reduction in their diameter.
• the mini bubbles thus produced have a narrow diameter distribution.
• the device according to the invention makes it possible to obtain bubbles of very small diameter, p. ex. 0.05 mm.
• the very small bubbles obtained with the device according to the invention can be trapped in the liquid, they do not rise to the surface, which makes it possible to conserve an aerated liquid.
• the device according to the invention makes it possible to produce the mini-bubbles very quickly and to distribute them very homogeneously in the liquid.
• the invention also offers possibilities of efficient applications in fields such as the aeration of slurry or the elimination of hydrocarbons in seas, lakes or rivers, the generation of mini-bubbles resulting in a thrust of the hydrocarbons in direction of the water surface.
• the disc is designed to be driven in rotation by the displacement of the liquid. This mode can be applied for the production of mini-bubbles in a river.
• the disc is preferably provided with blades.
• the mixing space is open.
• the gas-liquid mixture is entrained towards the disc, for example thanks to the vortex generated around the shaft during its rotation.
• the shaft is hollow so as also to act as a gas inlet in the mixing space.
• the contact surface of the disc has either grooves or longitudinal projections, each of them having one end directed, or even terminating, towards the periphery of the disc.
• the grooves / projections have several functions. They promote in particular the reduction in the diameter of the bubbles produced in the mixing space and the ejection of the mini-bubbles in a direction substantially perpendicular to the main axis of the device.
• the opposite face of the disc has a relief suitable for attracting a portion of the mini-bubbles in a direction substantially identical to that of the main axis of the device.
• Figure 1 shows a first variant with a closed mixing space
• FIG. 2 represents a second variant very close to the first.
• FIG. 3 represents a third variant with a shaft arranged outside the mixing space.
• FIG. 4 represents a fourth variant operating without a tree
• Figure 5 shows a fifth variant
• Figure 6 shows a sixth variant with an open mixing space
• Figure 7 shows a seventh variant with two discs
• FIG. 8 represents an embodiment of the face of the disc opposite to the contact face
• FIG. 9 represents a first embodiment of the contact face of the disc
• FIG. 10 represents a second embodiment of the contact face of the disc
• FIG. 11 represents a third embodiment of the contact face of the disc
• FIG. 12 represents a fourth embodiment of the contact face of the disc
• FIG. 13 shows a fifth embodiment of the contact face of the disc.
• FIG. 14 shows a sixth embodiment of the face of the disc opposite the contact face.
• FIG. 15 represents a seventh embodiment of the contact face of the disc
• FIG. 16 represents an eighth embodiment of the contact face of the disc
• FIG. 17 represents a ninth embodiment of the contact face of the disc
• Figure 18 shows the disc of Figure 17, opposite side.
• the device shown in Figure 1 comprises a disc 1 fixed to a hollow shaft 3 driven by a motor 2 disposed outside the liquid 26. Near the disc 1 is a closed mixing space 5 which includes an inlet 9 liquid and an outlet passage 8. The portion of the shaft 3 disposed in the mixing space 5 comprises a gas inlet 4.
• the device operates as follows: The rotation of the disc 1 driven by the shaft 3 - motor 2 assembly induces a vortex phenomenon around the shaft 3, which results in an aspiration of the gas (eg atmospheric air ) and liquid 26 in the mixing space 5.
• the gas and / or the liquid can be actively introduced, eg under pressure, into the mixing space 5.
• the gas-liquid mixture thus obtained is entrained towards the outlet passage 8 and contacts a face 6 of the disc 1, which has the effect of producing bubbles of diameter smaller than those already generated in the mixing space 5.
• the device represented in FIG. 2 differs from that of FIG. 1 only in that the gas connection 12 is immersed in the liquid 26 and that the device comprises a gas chamber 18 traversed by the hollow shaft 3, the latter comprising at the gas chamber a gas inlet orifice 19.
• the device of FIG. 3 is characterized by a mixing space 5 devoid of a shaft 3.
• the entry of gas into the space 5 being produced by a gas inlet (not shown) arranged on a wall surrounding the space mixing 5.
• the device illustrated in FIG. 4 is completely devoid of a tree.
• a blade system 21 is fixed on the face 7 of the disc 1 which is opposite to the contact face 6. The rotation of the disc is ensured via the blade system 21 which is driven by the movement of the liquid 26.
• a convex variant of the contact face 6 of the disc 1 will also be noted.
• the device of FIG. 5 shows a full shaft 3, the gas being sucked in by a venturi disposed before the mixing space 5, the liquid inlet 9 being located in an adjacent duct and communicating with the mixing space 5 by by means of a pumping element 23, blades eg
• FIG. 6 shows a device with an open mixing space 5, the gas being conveyed in the shaft 3 via a gas chamber 18.
• the gas-liquid mixture is entrained in the direction of the disc 1 by the vortex 13 generated along the shaft 3.
• Above the gas inlet 4 is a vortex cut-off element 25. Its presence leads the vortex to the gas inlet 4.
• FIG. 7 presents a device different from that of FIG. 6 in the sense that it comprises a second disc 1 ".
• Two gas inlets 4 are arranged on the portion of the shaft 3 which is located between the two discs 1, The free end of the shaft 3 comprises a second vortex cut-off element 25.
• An additional gas inlet 4 is disposed on the shaft 3 between the second disc 1 'and the second vortex cut-off element 25 .
• FIG. 8 shows an example of the face 7 of the disc 1 opposite the contact face 6. It has three ramps forming arcs of a circle.
• FIG. 9 shows an example of the contact face 6 of the disc 1 with grooves 14 one end of which 15 is disposed on the periphery of the disc 1 and the other end of which tangentially ends in a circle of small diameter surrounding the center of the disc 1.
• FIG. 10 shows another example of the contact face 6 of the disc with radial grooves 14, the section of the grooves being substantially circular.
• FIG. 11 shows a variant identical to that of Figure 9 with the exception that the section of the grooves is square.
• FIG. 12 shows another example of the contact face 6 of the disc with two sets of grooves, namely a set of radial grooves and a set of short grooves arranged obliquely towards the periphery of the disc 1.
• FIGS. 13 to 15 show other examples of the contact face 6 of the disc with longitudinal projections 16.
• the grooves / protrusions have one end terminating on the periphery of the disc. According to other variants not illustrated of the invention, the grooves / projections only extend over part of the radius of the disc.
• the disc with conical fins 16 shown in FIG. 16 offers the advantage of creating a very powerful vortex inside the apparatus while transmitting a minimum of power to the output of the disc.
• This disc makes it possible to reduce the size of the bubbles and to make them in a small container without them coalescing because of the proximity of the walls.
• the conical disc illustrated in FIGS. 17 and 18 comprises on the envelope of the cone a series of grooves 28 distributed radially.
• This configuration has the advantage of diffusing the microbubbles downwards and of having a particularly high "quantity of gas introduced" installed power "ratio.
• Another advantage is the little mixing of the liquid (very important for wine, or in sewage treatment plants so as not to break the flocs)
• the size of the bubbles is larger than with a finned disc (0.5 mm approximately).
• the device according to the invention for the extraction of gas in a liquid, for example in oil.
• the gas is removed inside the vortex.
• the means which are normally used to inject a gas eg the shaft 3
• the latter can be achieved by suction by means of a vacuum pump.
• the length of the device varies between a few centimeters and a few meters and the diameter of the disc between one and a few tens of centimeters.

Applications Claiming Priority (3)

Publications (1)

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ID=32831670

Family Applications (1)

Country Status (2)

Cited By (1)

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Family Cites Families (4)

• 2004
  • 2004-02-10 WO PCT/CH2004/000075 patent/WO2004069395A1/fr not_active Application Discontinuation
  • 2004-02-10 EP EP04709564A patent/EP1594599A1/de not_active Withdrawn

Non-Patent Citations (1)

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