EP0445169A1 - Dispositif permettant de melanger un gaz et un liquide - Google Patents

Dispositif permettant de melanger un gaz et un liquide

Info

Publication number
EP0445169A1
EP0445169A1 EP89913017A EP89913017A EP0445169A1 EP 0445169 A1 EP0445169 A1 EP 0445169A1 EP 89913017 A EP89913017 A EP 89913017A EP 89913017 A EP89913017 A EP 89913017A EP 0445169 A1 EP0445169 A1 EP 0445169A1
Authority
EP
European Patent Office
Prior art keywords
gas
liquid
mixture
restrictor
passage
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Withdrawn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
EP89913017A
Other languages
German (de)
English (en)
Inventor
Stephen Terence Dunne
Terence Edward Weston
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.)
DUNNE MILLER WESTON Ltd
Original Assignee
DUNNE MILLER WESTON 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 GB888827197A external-priority patent/GB8827197D0/en
Priority claimed from GB898901648A external-priority patent/GB8901648D0/en
Priority claimed from GB898906512A external-priority patent/GB8906512D0/en
Priority claimed from GB898909312A external-priority patent/GB8909312D0/en
Application filed by DUNNE MILLER WESTON Ltd filed Critical DUNNE MILLER WESTON Ltd
Publication of EP0445169A1 publication Critical patent/EP0445169A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1284—Mixing devices
    • 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
    • B01F25/3122—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof the material flowing at a supersonic velocity thereby creating shock waves
    • 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
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • 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
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • 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
    • B01F25/40—Static mixers
    • B01F25/45—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521—Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0018—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam
    • B05B7/0025—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply
    • B05B7/0031—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply with disturbing means promoting mixing, e.g. balls, crowns
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • 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
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • 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

  • This invention relates to a device for mixing a liquid with a gas to produce a fine foam.
  • Venturi tubes where for instance air is sucked into a pipe in the form of bubbles containing liquid, or liquid is sprayed into a Venturi-shaped tube containing gas. Velocities are kept above laminar flow levels to ensure turbulent flow and hence good mixing. Other mixing devices use blades and other mechanical devices with moving parts to mix the two phases.
  • aerator used to aerate slurry on farms to accelerate the digestion of noxious bacteria and reduce the smell.
  • the liquid to be aerated is pumped through a nozzle to increase its velocity and hence lower its pressure. After passing through the nozzle it enters a 'T' piece with a connection to an air supply at right angles to the flow of liquid. Air is dragged into the liquid flow in the manner of an ejector. The mixed flow is then passed through a long barrel the size of which ensures that the flow is turbulent r and hence rigorous mixing takes place.
  • a Venturi tube is used to drag oxygen into a flow of water. hen this mixture expands in the expansion section of .the Venturi tube vigorous mixing takes place because of the positive pressure gradient.
  • Yet another aerating device works by pumping liquid to a mixing head which contains a large number of stainless steel pins on both a stator and rotor.
  • the rotor mixes the ingredients ⁇ and at the same time compressed air is introduced into the head to aerate the mix to a foam.
  • mixing is achieved by mechanical means.
  • a device for mixing a liquid with a gas to produce a fine foam comprising: means for feeding a liquid under pressure along a passage, gas inlet means for admitting gas into the passage to mix with the liquid, and a sized restrictor through which the mixture is forced to pass, causing the mixture to reach substantially a supersonic velocity downstream of the restrictor, whereby the shock waves resulting from the subsequent decelaration of the mixture cause the mixture to be further broken up to produce a fine foam.
  • the passage may be a tube containing the liquid with one or more openings, in which gas is allowed to pass and mix with the liquid to form bubbles.
  • the resultant mixture is then passed through a carefully sized convergent-divergent nozzle which ensures that the mixed flow is first forced to go supersonic and then forced to pass through shock waves as it decelerates back to subsonic.
  • Pre ixing of the liquid gas mixture can be enhanced by passing the mixture through an orifice or other mixing device upstream of the supersonic nozzle.
  • only one orifice is used. At the entrance to the orifice vigorous mixing ensures that a relatively fine mix is exhausted at the orifice exit. Choking of the mixture takes place at the exit (sonic velocity) and as the mixture expands downstream of the exit it goes supersonic for a short distance and finally passes through shock waves as it decelerates to a subsonic condition .
  • a Venturi tube is used to suck gas into the liquid stream. This mixture is then passed through a supersonic nozzle.
  • the supersonic nozzle is a convergent-divergent or de-Laval nozzle.
  • large Mach numbers ratio of velocity to sonic velocity
  • the gas will have to be separated from the liquid mixture at a later stage.
  • the device in accordance with the invention uses the little known phenomena of choking in gas-liquid mixtures. This phenomena is described below.
  • This phenomena of supersonic flow and its associated shock waves is used in the present invention to break gas-liquid mixtures into fine foams.
  • Figure 1 is a sectional view of a device in accordance with one embodiment of the invention.
  • Figure 2 is a device similar to Figure 1 but incorporating a Venturi gas inlet
  • Figure 3 is a further device but incorporating a de-Laval nozzle. Detailed description
  • liquid 1 is forced along a tube 2 in which openings 4 are located from which gas 3 is injected into the liquid stream.
  • the resultant bubbly mixture is passed through a pre-mixing orifice 6, which breaks up the bubbles and mixes the two constituents further and increases the volumetric ratio of gas to liquid because of the associated pressure reduction and expansion of the gas.
  • the resultant mixture which should preferably be near to 50% gas in volumetric terms, is then passed through a sized restrictor in the form of a second orifice 7 where the mixture reaches sonic conditions. As the mixture leaves orifice 7 and expands into the increased space, it goes supersonic and then decelerates to subsonic through shock waves, resulting in a foamy mixture 9.
  • the number of orifices used can vary depending on factors such as the gas to liquid ratios, the type of gas and liquid, and the flow rates.
  • liquid 1 is forced along a tube 2 and into a Venturi 11 in which openings 4 are located from which gas 3 is injected into the liquid stream.
  • the resultant bubbly mixture is further broken up in the expansion section of the Venturi, resulting in an even finer mixture which should preferably be near to 50% gas in volumetric terms.
  • This is then passed through an orifice 7 where the mixture reaches sonic conditions. As the mixture leaves orifice 7 and expands into the increased space it again decelerates and passes through shock waves, resulting in a foamy mixture 9.
  • liquid 1 is forced along a tube 2 to which openings 4 are located from which gas 3 is injected into ' the liquid stream.
  • the resultant bubbly mixture is passed through a pre-mixing orifice 6 which again breaks up the bubbles, and mixes the two constituents further, and increases the volumetric ratio of gas to liquid.
  • the resultant mixture again near to 50% gas in volumetric terms, is then passed through a de Laval convergent divergent nozzle 12 where the mixture reaches sonic conditions at the throat. As the mixture leaves nozzle 12 and expands into the increased space it again goes supersonic and then declerates to subsonic through shock waves, resulting in a foamy mixture 9.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)

Abstract

Dispositif permettant de mélanger des liquides et des gaz pour obtenir une mousse légère, qui sert à l'aération ou au nettoyage au gaz, comprenant un passage tubulaire (2), au travers duquel passe un liquide sous pression, et qui est muni d'ouvertures (4) pour l'introduction du gaz. Le mélange ainsi obtenu est poussé au travers d'une ouverture de prémélange (6) puis d'un passage cintré (7) pour lui donner une vitesse supersonique, de sorte que les ondes de choc ultérieures produisent une mousse légère. On peut introduire le gaz par le biais d'un venturi (11) et le passage cintré peut être un injecteur convergent-divergent de Laval (12).
EP89913017A 1988-11-22 1989-11-22 Dispositif permettant de melanger un gaz et un liquide Withdrawn EP0445169A1 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
GB8827197 1988-11-22
GB888827197A GB8827197D0 (en) 1988-11-22 1988-11-22 Gas driven regulator for controlling flow of liquids
GB8828750 1988-12-08
GB888828750A GB8828750D0 (en) 1988-11-22 1988-12-08 Improved flow discharge valve
GB898901648A GB8901648D0 (en) 1989-01-26 1989-01-26 Improved flow discharge valve
GB8901648 1989-01-26
GB8906512 1989-03-21
GB898906512A GB8906512D0 (en) 1988-11-22 1989-03-21 Improved flow discharge valve
GB898909312A GB8909312D0 (en) 1988-11-22 1989-04-24 Liquid-gas mixing device
GB8909312 1989-04-24

Publications (1)

Publication Number Publication Date
EP0445169A1 true EP0445169A1 (fr) 1991-09-11

Family

ID=27516863

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89913017A Withdrawn EP0445169A1 (fr) 1988-11-22 1989-11-22 Dispositif permettant de melanger un gaz et un liquide

Country Status (3)

Country Link
EP (1) EP0445169A1 (fr)
AU (1) AU4625089A (fr)
WO (1) WO1990005583A1 (fr)

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX9100829A (es) * 1990-08-27 1992-04-01 Univ The Newcastle Research As Aparato de aireacion con difusor
DE4029982C2 (de) 1990-09-21 2000-08-10 Steinecker Anton Entwicklung Vorrichtung zum Begasen einer Flüssigkeit
DE4235558C1 (de) * 1992-10-22 1994-05-11 Fischtechnik Fredelsloh Dr Ger Verfahren und Vorrichtung zum Lösen eines Gases in einer Flüssigkeit
US6386463B1 (en) 1996-05-13 2002-05-14 Universidad De Sevilla Fuel injection nozzle and method of use
US6116516A (en) 1996-05-13 2000-09-12 Universidad De Sevilla Stabilized capillary microjet and devices and methods for producing same
US6196525B1 (en) 1996-05-13 2001-03-06 Universidad De Sevilla Device and method for fluid aeration via gas forced through a liquid within an orifice of a pressure chamber
US6299145B1 (en) 1996-05-13 2001-10-09 Universidad De Sevilla Device and method for fluid aeration via gas forced through a liquid within an orifice of a pressure chamber
US6405936B1 (en) 1996-05-13 2002-06-18 Universidad De Sevilla Stabilized capillary microjet and devices and methods for producing same
US6187214B1 (en) 1996-05-13 2001-02-13 Universidad De Seville Method and device for production of components for microfabrication
US6792940B2 (en) 1996-05-13 2004-09-21 Universidad De Sevilla Device and method for creating aerosols for drug delivery
US6189803B1 (en) 1996-05-13 2001-02-20 University Of Seville Fuel injection nozzle and method of use
US6595202B2 (en) 1996-05-13 2003-07-22 Universidad De Sevilla Device and method for creating aerosols for drug delivery
ES2140998B1 (es) 1996-05-13 2000-10-16 Univ Sevilla Procedimiento de atomizacion de liquidos.
AU745698B2 (en) * 1997-12-17 2002-03-28 Universidad De Sevilla Device and method for aeration of fluids
EP1037858A1 (fr) * 1997-12-17 2000-09-27 Universidad de Sevilla Dispositif et procede pour creer des particules spheriques de taille uniforme
EP0990464B1 (fr) * 1998-09-28 2003-03-12 ALSTOM (Switzerland) Ltd Pompe à jet pour la compression d'un mélange biphasé par écoulement supersonique
CN1251783A (zh) * 1998-10-21 2000-05-03 普拉塞尔技术有限公司 采用高强度管式反应器强化快速平推流反应的方法
US6450189B1 (en) 1998-11-13 2002-09-17 Universidad De Sevilla Method and device for production of components for microfabrication
IT251656Y1 (it) * 2000-01-27 2003-12-18 Zenit Spa Diaframma di regolazione della luce utile di passaggio in dispositiviimmersi per la ossigenazione di vasche di raccolta di acque bianche e
WO2001062392A1 (fr) * 2000-02-23 2001-08-30 Baker Hughes Incorporated Dispositif de buse d'injection destine a des recipients de reaction aeres et procede de fonctionnement de tels recipients
DE10100867A1 (de) * 2001-01-11 2002-07-25 Buender Glas Gmbh Verfahren und Vorrichtung zum Erzeugen eines Aerosols
FR2860735B1 (fr) * 2003-10-10 2006-12-22 Degremont Buse de detente d'eau pressurisee pour generer des microbules dans une installation de flottation
GB201006080D0 (en) * 2010-04-13 2010-05-26 Univ Salford The Aerosol spray device
MX2012014091A (es) 2010-06-09 2013-01-29 Procter & Gamble Produccion de alimentacion semicontinua de composiciones liquidas para el cuidado personal.
DE102012100315A1 (de) * 2012-01-15 2013-07-18 Uwe Werner Reagensloses, energetisches Verfahren und dazugehörige Anlage zur Herstellung von huminhaltigen Suspensionen
RU2631878C1 (ru) * 2016-09-16 2017-09-28 Общество с ограниченной ответственностью "ХАММЕЛЬ" Устройство диспергирования газожидкостной смеси
BR102017011253A2 (pt) * 2017-05-29 2019-03-26 Felipe Leite Almeida Bocal venturico bifásico multidirecional
CN108980823B (zh) * 2018-09-26 2023-10-10 洛阳帝博石化装备有限公司 一种高效节能型燃烧喷嘴
FR3091277B1 (fr) * 2018-12-26 2021-07-23 Orege Procédé et dispositif d’amélioration de la biodégradabilité d’une boue
FR3091276B1 (fr) 2018-12-26 2021-06-18 Orege Procédé et dispositif de méthanisation améliorés

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE445683A (fr) * 1940-06-17
GB2076672A (en) * 1980-02-18 1981-12-09 Unilever Ltd Making foam
FR2484862B1 (fr) * 1980-06-18 1984-09-14 Inst Nat Rech Chimique Procede et dispositif pour le transfert de gaz dans un liquide applicable en particulier au traitement des eaux, en biotechnologie et dans l'industrie chimique
CA1180734A (fr) * 1981-04-21 1985-01-08 David R.P. Simpkins Atomiseur
FR2561539B1 (fr) * 1984-03-20 1988-09-16 Raffinage Cie Francaise Dispositif de pulverisation d'un liquide dans un flux gazeux a plusieurs venturis successifs et applications de ce dispositif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9005583A1 *

Also Published As

Publication number Publication date
AU4625089A (en) 1990-06-12
WO1990005583A1 (fr) 1990-05-31

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