EP0445169A1 - Liquid-gas mixing device - Google Patents
Liquid-gas mixing deviceInfo
- 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- Withdrawn
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).Device for mixing liquids and gases to obtain a light foam, which is used for gas ventilation or cleaning, comprising a tubular passage (2), through which a pressurized liquid passes, and which is provided with openings (4) for the introduction of gas. The mixture thus obtained is pushed through a premix opening (6) and then a curved passage (7) to give it a supersonic speed, so that the subsequent shock waves produce a light foam. The gas can be introduced via a venturi (11) and the curved passage can be a convergent-divergent Laval injector (12).
Description
Claims
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 |
GB8901648 | 1989-01-26 | ||
GB898901648A GB8901648D0 (en) | 1989-01-26 | 1989-01-26 | Improved flow discharge valve |
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 (en) | 1991-09-11 |
Family
ID=27516863
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89913017A Withdrawn EP0445169A1 (en) | 1988-11-22 | 1989-11-22 | Liquid-gas mixing device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0445169A1 (en) |
AU (1) | AU4625089A (en) |
WO (1) | WO1990005583A1 (en) |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992003218A1 (en) * | 1990-08-27 | 1992-03-05 | The University Of Newcastle Research Associates Limited | Aeration of liquids |
DE4029982C2 (en) | 1990-09-21 | 2000-08-10 | Steinecker Anton Entwicklung | Device for gassing a liquid |
DE4235558C1 (en) * | 1992-10-22 | 1994-05-11 | Fischtechnik Fredelsloh Dr Ger | Vertical reactor for dissolving gas in liq., and esp. oxygen@ in water - liquid and gas pass downwards through number of perforated plates at velocity chosen so that limited bubble zone is formed beneath each plate |
US6116516A (en) | 1996-05-13 | 2000-09-12 | Universidad De Sevilla | Stabilized capillary microjet and devices and methods for producing same |
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 |
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 |
US6189803B1 (en) | 1996-05-13 | 2001-02-20 | University Of Seville | Fuel injection nozzle and method of use |
US6187214B1 (en) | 1996-05-13 | 2001-02-13 | Universidad De Seville | Method and device for production of components for microfabrication |
US6595202B2 (en) | 1996-05-13 | 2003-07-22 | Universidad De Sevilla | Device and method for creating aerosols for drug delivery |
US6792940B2 (en) | 1996-05-13 | 2004-09-21 | Universidad De Sevilla | Device and method for creating aerosols for drug delivery |
US6405936B1 (en) | 1996-05-13 | 2002-06-18 | Universidad De Sevilla | Stabilized capillary microjet and devices and methods for producing same |
US6386463B1 (en) | 1996-05-13 | 2002-05-14 | Universidad De Sevilla | Fuel injection nozzle and method of use |
ES2140998B1 (en) * | 1996-05-13 | 2000-10-16 | Univ Sevilla | LIQUID ATOMIZATION PROCEDURE. |
EP1039965A1 (en) * | 1997-12-17 | 2000-10-04 | Universidad de Sevilla | Device and method for aeration of fluids |
AU745904B2 (en) * | 1997-12-17 | 2002-04-11 | Universidad De Sevilla | Device and method for creating spherical particles of uniform size |
ATE234144T1 (en) | 1998-09-28 | 2003-03-15 | Alstom Switzerland Ltd | JET PUMP FOR COMPRESSING A TWO-PHASE MIXTURE USING SUPERSONIC FLOW |
KR20000029169A (en) * | 1998-10-21 | 2000-05-25 | 조안 엠. 젤사;로버트 지. 호헨스타인;도로시 엠. 보어 | A process for intensifying the rate of transfer between a gas phase and a liquid phase in a plug flow tubular reactor |
US6450189B1 (en) | 1998-11-13 | 2002-09-17 | Universidad De Sevilla | Method and device for production of components for microfabrication |
IT251656Y1 (en) * | 2000-01-27 | 2003-12-18 | Zenit Spa | DIAPHRAGM OF ADJUSTMENT OF THE USEFUL PASSAGE LIGHT IN IMMERSED DEVICES FOR THE OXYGENATION OF WHITE AND WASTE COLLECTION TANKS |
AU2001238633A1 (en) * | 2000-02-23 | 2001-09-03 | Baker Hughes Incorporated | Sparging nozzle assembly for aerated reaction vessels and method for operating such vessels |
DE10100867A1 (en) * | 2001-01-11 | 2002-07-25 | Buender Glas Gmbh | Method and device for producing an aerosol |
GB201006080D0 (en) * | 2010-04-13 | 2010-05-26 | Univ Salford The | Aerosol spray device |
CA2810160C (en) * | 2010-06-09 | 2016-04-12 | The Procter & Gamble Company | Semi-continuous feed production of liquid personal care compositions |
DE102012100315A1 (en) * | 2012-01-15 | 2013-07-18 | Uwe Werner | Reagent-free, energetic process and associated plant for the preparation of humin-containing suspensions |
RU2631878C1 (en) * | 2016-09-16 | 2017-09-28 | Общество с ограниченной ответственностью "ХАММЕЛЬ" | Gas-liquid mixture dispergation device |
BR102017011253A2 (en) * | 2017-05-29 | 2019-03-26 | Felipe Leite Almeida | MULTIDirectional Biphasic VENTURIC NOZZLE |
CN108980823B (en) * | 2018-09-26 | 2023-10-10 | 洛阳帝博石化装备有限公司 | High-efficiency energy-saving combustion nozzle |
FR3091277B1 (en) * | 2018-12-26 | 2021-07-23 | Orege | Method and device for improving the biodegradability of a sludge |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE445683A (en) * | 1940-06-17 | |||
GB2076672A (en) * | 1980-02-18 | 1981-12-09 | Unilever Ltd | Making foam |
FR2484862B1 (en) * | 1980-06-18 | 1984-09-14 | Inst Nat Rech Chimique | PROCESS AND DEVICE FOR TRANSFERRING GAS IN A LIQUID APPLICABLE IN PARTICULAR TO WATER TREATMENT, BIOTECHNOLOGY AND THE CHEMICAL INDUSTRY |
CA1180734A (en) * | 1981-04-21 | 1985-01-08 | David R.P. Simpkins | Atomizer |
FR2561539B1 (en) * | 1984-03-20 | 1988-09-16 | Raffinage Cie Francaise | DEVICE FOR SPRAYING A LIQUID IN A GAS STREAM WITH MULTIPLE SUCCESSIVE VENTURIS AND APPLICATIONS THEREOF |
-
1989
- 1989-11-22 EP EP89913017A patent/EP0445169A1/en not_active Withdrawn
- 1989-11-22 AU AU46250/89A patent/AU4625089A/en not_active Abandoned
- 1989-11-22 WO PCT/GB1989/001395 patent/WO1990005583A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9005583A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU4625089A (en) | 1990-06-12 |
WO1990005583A1 (en) | 1990-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19910503 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES FR GB IT LI LU NL SE |
|
17Q | First examination report despatched |
Effective date: 19920609 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19921020 |