EP0523202A1 - System for generating microbubbles in a liquid mass - Google Patents

System for generating microbubbles in a liquid mass Download PDF

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Publication number
EP0523202A1
EP0523202A1 EP92902926A EP92902926A EP0523202A1 EP 0523202 A1 EP0523202 A1 EP 0523202A1 EP 92902926 A EP92902926 A EP 92902926A EP 92902926 A EP92902926 A EP 92902926A EP 0523202 A1 EP0523202 A1 EP 0523202A1
Authority
EP
European Patent Office
Prior art keywords
porous
diffuser
liquid mass
diffusers
orifices
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92902926A
Other languages
German (de)
English (en)
French (fr)
Inventor
Dionisio Rodriguez Martinez
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FILTROCESA SA
Original Assignee
FILTROCESA SA
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
Application filed by FILTROCESA SA filed Critical FILTROCESA SA
Publication of EP0523202A1 publication Critical patent/EP0523202A1/en
Withdrawn legal-status Critical Current

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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
    • B01F23/231—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
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
    • 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
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • 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

Definitions

  • the invention relates to a system designed to homogenize a liquid mass by injecting air bubbles into the actual liquid mass, thereby to disturb the same and attain a uniform homogeneity thereof.
  • the system can be applied to electrolytic processes, gas transfers, water purification, fish farms and so forth.
  • the parts are anodized in a horizontal arrangement because of the scarce height of the tanks (usually between 2 and 3 m).
  • the upward travel of the bubbles injected into the electrolyte barely takes enough time for them to come together before reaching the surface, and therefore the methods used in injecting air bubbles can be deemed to be acceptable.
  • the anodizing process is carried out with the parts in a vertical arrangement, which means that the systems usually employed to inject air into the electrolyte are no longer valid, inasmuch as the bubbles produced gradually come together as they travel up the approximately 6 or 7 m and, becoming increasingly larger, and preventing not only homogenization of the electrolyte and correct anodizing, but correct uniformity of the conductivity of the actual electrolyte.
  • the effect sought by injecting bubbles is for the latter to have as small a diameter as possible and the least possible kinetic energy, viz. the lowest possible speed, so that the bubbles remain unaltered as they travel up the tank, preventing as best as possible their coming together.
  • the means used to produce bubbles comprised making manifold orifices along the piping, which orifices had a diameter ranging between 1 and 3 mm, thus being unduly large.
  • Spanish patent of invention 9001093 claims a homogenization device using a porous diffuser, such device comprising a gas distributing element in which various injectors are inserted through which the high-speed gas moves, the porous elements or diffusers being precisely arranged to cover the injectors, all such that on injecting the gas into the said diffusers, the said gas may spread throughout the porous mass, and the speed lowered to suitable circulation values through the pores.
  • the gas On exiting through the diffusers, the gas produces bubbles that are evenly spread throughout the surface of the diffusers and evenly transferred and homogenized in the liquid mass.
  • the branches making up the ducts where the porous diffusers are arranged are mounted in series and therefore the loss of head is important, prevents the last diffusers in each branch to evacuate the water passed through the same, this leading on the one hand to the placing of check valves preventing the entry of water into the ducting when blowing stops, and on the other, in order for blowing at the last diffusers on each branch to be appropriate, to a larger quantity of air being blown which causes the first diffusers in the branches to inject more air than should be.
  • patent 4,048,072 that is designed for this same purpose, provides that the bubbles exit through an enveloping chamber lying between an external lattice and an internal concentric tube, such chamber being full of a grained product, such as pebbles.
  • the pressure at which this is effected must be the normal working pressure, in order for the air to move the water that shall have flooded the inside of the diffuser, which must naturally be immersed in a liquid medium, but will do so at the sector close to the air inlet up to wherever the injected air pressure is equal to the internal water pressure, which means that bubbles will only exit through a sector close to the entrance to the diffuser rather than through the whole of the same.
  • both these US patents are able to homogenize a gas or air in the liquid or water, but are unable to provide high quality homogenization for want of sufficient dispersion that could be appropriate if they were applied to certain processes, namely electrolytic processes.
  • These processes require the size of the bubbles to be as little as possible and equal at different depth levels, and at the same time a perfectly uniform distribution of the microbubbles throughout the mass. All of this is aimed at achieving a uniform distribution of the current, modifying the conductivity of the electrolyte as little as possible, and homogenizing the temperature thereof as much as possible.
  • the system subject hereof has been designed to fully solve the above problems, affording in such respect a simple and efficient solution, relying in the first place on the fact that the installation will be structured with lattices rather than arranging the branches in series as in conventional installations, the said lattice arrangement being such that the porous diffusers are arranged in parallel thereby to avoid the problems posed by the above-mentioned series arrangement.
  • the air will not exit directly through the porous diffusers, as is usually the case, and thus before reaching such porous diffusers, the air shall pass through a number of orifices provided in a concentric tube in the porous diffuser, which orifices lead into a common ducting, before reaching the actual porous diffuser, to equalize the pressures.
  • These concentric tubes naturally define a chamber that can never be filled with liquid, moreover ensuring a uniform air pressure.
  • the said concentric tube orifices linking the chamber defined in the tube with the common chamber provided before reaching the porous diffuser are specifically arranged on the lower sector, thereby for the useful surface through which the bubbles exit to be located on the upper half of the porous diffuser, whereas approximately the lower half remains as a useless surface through which no bubbles will exit, this causing the said bubbles to rise through the liquid mass up to the latter's surface without coming together.
  • the section of the orifices on each main branch has also been provided to be greater than the sum of the surface of the above-mentioned calibrated or outlet orifices in order to cause overpressures in the conduits thereby to achieve a correct outlet of the air.
  • FIGS show part of a general installation forming a lattice with branches (1) or fluid distribution conduits, with the porous diffusers (2) arranged in parallel, and the relevant communication orifices (3) provided on the main branches (1).
  • Figure 2 shows a cross-section of a porous diffuser (2), such comprising a tubular body (4), obviously made of porous material, inside which is concentrically arranged a tube (5) preferably made of plastic, such as PVC, the lower part of which is provided with a number of calibrated orifices (6) leading into a common and linear chamber (7) before reaching the actual body (4) of the general porous diffuser (2).
  • the section of the orifices on each main branch must be greater than the sum of the surface of the outlet orifices (6) in order to cause overpressures in the conduits and for outlet of the air to be correct.
  • the air entering the chamber formed by the concentric tube (5) reaches the latter's orifices (6) and before arriving at the porous body or diffuser (4) enters a linear and common chamber (7) that, as aforesaid, joins all the orifices (6), thereby for the pressures to be equalized.
  • the said diffuser when immersed in a liquid, the latter shall pass into the tube (5) through the lower sector, this being where the orifices (7) are provided, until it reaches a certain height, which is when the pressures of the air or gas lying inside the actual tube (5) and of the water or liquid flooding the diffuser shall be balanced, and therefore the latter shall never be fully flooded, as compared with the diffusers described in the US patents referred to as state of the art.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Nanotechnology (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
EP92902926A 1991-01-18 1992-01-17 System for generating microbubbles in a liquid mass Withdrawn EP0523202A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9100133A ES2027605A6 (es) 1991-01-18 1991-01-18 Sistema de generacion de microburbujas en una masa liquida.
ES9100133 1991-01-18

Publications (1)

Publication Number Publication Date
EP0523202A1 true EP0523202A1 (en) 1993-01-20

Family

ID=8270838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92902926A Withdrawn EP0523202A1 (en) 1991-01-18 1992-01-17 System for generating microbubbles in a liquid mass

Country Status (6)

Country Link
EP (1) EP0523202A1 (es)
JP (1) JPH05505342A (es)
AU (1) AU1176992A (es)
CA (1) CA2078565A1 (es)
ES (1) ES2027605A6 (es)
WO (1) WO1992012788A1 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003024578A1 (en) * 2001-09-14 2003-03-27 Oxsea Vision As Device for oxygenating sea water

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1020820A3 (nl) * 2012-07-05 2014-05-06 Atlas Copco Airpower Nv Beluchtingstoestel, een gebruik ervan, en waterzuiveringsinstallatie met een dergelijk beluchtingstoestel.
WO2017187646A1 (ja) * 2016-04-29 2017-11-02 憲司 久木野 気泡の粒径分布を任意に調整できるナノサイズ気泡発生装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1271718A (fr) * 1960-08-06 1961-09-15 Montage des éléments diffuseurs pour l'épuration des eaux
US3279773A (en) * 1963-10-31 1966-10-18 Albert L Schwartz Gas distributing structure
US3911068A (en) * 1973-07-02 1975-10-07 Jock Hamilton Pool chlorination diffuser
DE3744608A1 (de) * 1987-12-31 1989-07-13 Schumacher Sche Fab Verwalt Vorrichtung zum begasen von fluessigkeiten
US4960546B1 (en) * 1989-04-19 1996-04-09 Environmental Dynamics Inc Diffuser mounting arrangement for waste water aeration systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9212788A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003024578A1 (en) * 2001-09-14 2003-03-27 Oxsea Vision As Device for oxygenating sea water
US7318901B2 (en) 2001-09-14 2008-01-15 Oxsea Vision As Device for oxygenating sea water

Also Published As

Publication number Publication date
CA2078565A1 (en) 1992-07-19
AU1176992A (en) 1992-08-27
WO1992012788A1 (es) 1992-08-06
ES2027605A6 (es) 1992-06-01
JPH05505342A (ja) 1993-08-12

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