EP1243313A2 - Appareil et procédé pour mélanger un gaz avec un liquide ou un liquide avec un liquide - Google Patents

Appareil et procédé pour mélanger un gaz avec un liquide ou un liquide avec un liquide Download PDF

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Publication number
EP1243313A2
EP1243313A2 EP02006458A EP02006458A EP1243313A2 EP 1243313 A2 EP1243313 A2 EP 1243313A2 EP 02006458 A EP02006458 A EP 02006458A EP 02006458 A EP02006458 A EP 02006458A EP 1243313 A2 EP1243313 A2 EP 1243313A2
Authority
EP
European Patent Office
Prior art keywords
liquid
propeller
gas
gaseous
blade
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Withdrawn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
EP02006458A
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German (de)
English (en)
Other versions
EP1243313A3 (fr
Inventor
Alberto Amici
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.)
R T N Srl
Original Assignee
R T N Srl
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 R T N Srl filed Critical R T N Srl
Publication of EP1243313A2 publication Critical patent/EP1243313A2/fr
Publication of EP1243313A3 publication Critical patent/EP1243313A3/fr
Withdrawn legal-status Critical Current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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2331—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 introduction of the gas along the axis of the stirrer or along the stirrer 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
    • B01F23/40—Mixing liquids with liquids; Emulsifying
    • B01F23/43—Mixing liquids with liquids; Emulsifying using driven stirrers
    • B01F23/431—Mixing liquids with liquids; Emulsifying using driven stirrers the liquids being introduced from the outside through or along the axis of a rotating stirrer, e.g. the stirrer rotating due to the reaction of the introduced liquid
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller

Definitions

  • This invention relates to a device and the corresponding method for mixing a gas with a liquid or a liquid with a liquid.
  • the said device comprises a ship's propeller which contains a channel that places the upper surface of the blades in communication with the environment containing a gas or liquid to be mixed with a liquid.
  • the said device draws the gas, such as air, from the external environment (or a liquid) using the negative pressure generated on the upper surface of the propeller blades immersed in the liquid, such as water, when the propeller is rotated, the said negative pressure being sufficient to suck in the said air.
  • the air thus aspirated will be effectively mixed with the liquid mass by the effect of the vortex caused by the rotating propeller, which breaks up the air into a myriad of bubbles, thus greatly increasing the exchange surface.
  • Processes which require two fluids, especially a gas and a liquid, to be mixed are used in various industrial systems (the chemical, food, water treatment and aquaculture industries, etc.).
  • the purpose of this invention is to overcome the drawbacks of the known art by providing a device that is easy and cheap to instal, requires little maintenance, does not produce spray, is not prone to clogging, and guarantees excellent mixing of a gas or liquid with a liquid.
  • the method in accordance with the invention can be conveniently used in all cases in which it is necessary to mix a liquid with a gas or another fluid, such as (by way of example but not of limitation) activated-sludge biological treatment plants for urban wastewater or uses in the chemical industry.
  • a gas or another fluid such as (by way of example but not of limitation) activated-sludge biological treatment plants for urban wastewater or uses in the chemical industry.
  • airfoil profiles means any profile that generates negative pressure when it moves in a fluid.
  • a ship's propeller exploits the same effect, because the blade has a profile (3a) which generates the same type of flow in the liquid; when it rotates, it therefore creates negative pressure on the upper surface of the blades of the said propeller.
  • the present invention is based on exploitation of that principle.
  • the said gas will be aspirated as a result of the negative pressure created on the upper surface of the blades.
  • the gas aspirated in this way enters the stream of liquid and mixes with it, mixing being aided by the fact that the said gas is in a highly vortical fluid, with the result that the exchange surface is very large.
  • the diagram in fig. 2 shows the direction and magnitude of the forces which act on airfoil (3a) of the said cross-section (3) of blade (4) when the said blade advances in the liquid at velocity V, having an angle of attack ⁇ .
  • the resultant F of the said forces can be broken down into a force P, which constitutes the propulsive thrust, and a force R, which constitutes the fraction due to generation of lift and resistance to the advance of the blade in the liquid (drag).
  • the diagram in fig. 3 shows the pressure trend along airfoil (3a) of the said cross-section (3), the said pressure trend being correlated with the force trend shown in fig. 2.
  • a possible form of embodiment of a device in accordance with the invention which is shown in fig. 4 by way of example but not of limitation, comprises:
  • the gas follows the route indicated by arrows (19), (19a) and (19b), enters opening (12) in support (10) and reaches blades (4), then exits through openings (7), passing through cavity (18), cavity (14a) in hub (14) and pipes (6) in blades (4).
  • the gas follows the said route indicated by arrows (19), (19a) and (19b) due to the difference in pressure between the environment from which the said gas is drawn and area (5) of the upper surface of blade (4), the said pressure difference being due to the rotation of propeller (1), which receives the necessary power from drive shaft (8) which connects the said propeller (1) to the motor.
  • the gas which exits from openings (7) in blades (4) mixes with the liquid in the area of greatest vorticity, and consequently breaks up into a myriad of bubbles which maximise the contact surface between liquid and gas.
  • the device to which the invention relates presents various advantages over the known art; in particular it is not prone to clogging and, as it operates totally immersed in the liquid and the gas passes through a pipe, without creating liquid-gas exchange surfaces in communication with the free surface, it does not create spray, and is also much quieter.
  • the device in accordance with the invention could be used in all fields in which a gas needs to be mixed thoroughly with a liquid, as in the case of the water treatment industry.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP02006458A 2001-03-23 2002-03-22 Appareil et procédé pour mélanger un gaz avec un liquide ou un liquide avec un liquide Withdrawn EP1243313A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPC010014 2001-03-23
IT2001PC000014A ITPC20010014A1 (it) 2001-03-23 2001-03-23 Dispositivo e metodo per miscelare un gas con un liquido o un liquidocon un liquido.

Publications (2)

Publication Number Publication Date
EP1243313A2 true EP1243313A2 (fr) 2002-09-25
EP1243313A3 EP1243313A3 (fr) 2004-09-01

Family

ID=11451706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02006458A Withdrawn EP1243313A3 (fr) 2001-03-23 2002-03-22 Appareil et procédé pour mélanger un gaz avec un liquide ou un liquide avec un liquide

Country Status (2)

Country Link
EP (1) EP1243313A3 (fr)
IT (1) ITPC20010014A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005056296B3 (de) * 2005-11-24 2007-04-12 Huppmann Ag Maischgefäß für die Bierherstellung und Flügelrotor für ein Maischgefäß
EP1765486B1 (fr) * 2004-06-21 2009-09-02 Blair H. Hills Appareil d'aeration diffusee
US8056887B2 (en) 2006-01-30 2011-11-15 Hills Blair H Apparatus for surface mixing of gasses and liquids
WO2012038054A1 (fr) * 2010-09-21 2012-03-29 EKATO Rühr- und Mischtechnik GmbH Pale agitatrice et dispositif agitateur
US8146894B2 (en) 2004-06-21 2012-04-03 Hills Blair H Apparatus for mixing gasses and liquids
EP3685910A2 (fr) 2019-01-25 2020-07-29 EKATO Rühr- und Mischtechnik GmbH Dispositif formant organe d'agitation
CN111804041A (zh) * 2020-08-31 2020-10-23 烟台熙成环保技术有限公司 一种废水处理用微滤机及其废水处理方法
RU2801134C2 (ru) * 2019-01-25 2023-08-02 Экато Рюр- Унд Миштехник Гмбх Устройство перемешивающей установки

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113210B (de) * 1957-02-14 1961-08-31 Patentauswertung Vogelbusch Ge Vorrichtung zur feinsten Verteilung von Gasen in Fluessigkeiten
DE1189522B (de) * 1957-04-20 1965-03-25 Patentauswertung Vogelbusch Ge Vorrichtung zur feinsten Verteilung von Gasen in Fluessigkeiten
DE1230399B (de) * 1962-08-07 1966-12-15 Weinrich Heinrich Dr Ing Vorrichtung zum Begasen von Fluessigkeiten
DE1244121B (de) * 1962-05-30 1967-07-13 Escher Wyss Gmbh Vorrichtung zum intensiven Begasen von Fluessigkeiten
DE1278409B (de) * 1965-10-11 1968-09-26 Weinrich Heinrich Dr Ing Vorrichtung zum Begasen von Fluessigkeiten
DE1457186A1 (de) * 1965-10-19 1970-06-04 Weinrich Heinrich Dr Ing Umwaelzpropeller zur Gaseintragung in Fluessigkeiten
DE2500887A1 (de) * 1975-01-10 1976-07-15 Linde Ag Ruehrer
GB1449410A (en) * 1973-08-29 1976-09-15 Ja Ro Ab Oy Apparatus for dispersing a medium in another medium
GB1494731A (en) * 1973-12-12 1977-12-14 Boc International Ltd Dissolving gases
EP0015050A1 (fr) * 1979-01-29 1980-09-03 General Signal Corporation Appareil pour le mélange de fluides
JPS63310628A (ja) * 1987-02-21 1988-12-19 ▲土▼田　正志 プロペラ型運搬装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113210B (de) * 1957-02-14 1961-08-31 Patentauswertung Vogelbusch Ge Vorrichtung zur feinsten Verteilung von Gasen in Fluessigkeiten
DE1189522B (de) * 1957-04-20 1965-03-25 Patentauswertung Vogelbusch Ge Vorrichtung zur feinsten Verteilung von Gasen in Fluessigkeiten
DE1244121B (de) * 1962-05-30 1967-07-13 Escher Wyss Gmbh Vorrichtung zum intensiven Begasen von Fluessigkeiten
DE1230399B (de) * 1962-08-07 1966-12-15 Weinrich Heinrich Dr Ing Vorrichtung zum Begasen von Fluessigkeiten
DE1278409B (de) * 1965-10-11 1968-09-26 Weinrich Heinrich Dr Ing Vorrichtung zum Begasen von Fluessigkeiten
DE1457186A1 (de) * 1965-10-19 1970-06-04 Weinrich Heinrich Dr Ing Umwaelzpropeller zur Gaseintragung in Fluessigkeiten
GB1449410A (en) * 1973-08-29 1976-09-15 Ja Ro Ab Oy Apparatus for dispersing a medium in another medium
GB1494731A (en) * 1973-12-12 1977-12-14 Boc International Ltd Dissolving gases
DE2500887A1 (de) * 1975-01-10 1976-07-15 Linde Ag Ruehrer
EP0015050A1 (fr) * 1979-01-29 1980-09-03 General Signal Corporation Appareil pour le mélange de fluides
JPS63310628A (ja) * 1987-02-21 1988-12-19 ▲土▼田　正志 プロペラ型運搬装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DICKEY D S: "SUCCEED AT STIRRED-TANK-REACTOR DESIGN" CHEM. ENGINEERING PROGR., AMERICAN INST. OF CHEM. ENGINEERS, NEW YORK, USA, vol. 87, no. 12, 1 December 1991 (1991-12-01), pages 22-31, XP000243999 ISSN: 0360-7275 *
PATENT ABSTRACTS OF JAPAN vol. 0131, no. 51 (C-584), 12 April 1989 (1989-04-12) -& JP 63 310628 A (MASASHI TSUCHIDA), 19 December 1988 (1988-12-19) *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1765486B1 (fr) * 2004-06-21 2009-09-02 Blair H. Hills Appareil d'aeration diffusee
US8146894B2 (en) 2004-06-21 2012-04-03 Hills Blair H Apparatus for mixing gasses and liquids
US8585023B2 (en) 2004-06-21 2013-11-19 Blair H. Hills Apparatus for mixing gasses and liquids
DE102005056296B3 (de) * 2005-11-24 2007-04-12 Huppmann Ag Maischgefäß für die Bierherstellung und Flügelrotor für ein Maischgefäß
US8056887B2 (en) 2006-01-30 2011-11-15 Hills Blair H Apparatus for surface mixing of gasses and liquids
WO2012038054A1 (fr) * 2010-09-21 2012-03-29 EKATO Rühr- und Mischtechnik GmbH Pale agitatrice et dispositif agitateur
EP3685910A2 (fr) 2019-01-25 2020-07-29 EKATO Rühr- und Mischtechnik GmbH Dispositif formant organe d'agitation
DE102019101934A1 (de) 2019-01-25 2020-07-30 EKATO Rühr- und Mischtechnik GmbH Rührorganvorrichtung
CN111495228A (zh) * 2019-01-25 2020-08-07 艾卡多搅拌及混合工程有限公司 搅拌装置
EP3685910A3 (fr) * 2019-01-25 2020-11-11 EKATO Rühr- und Mischtechnik GmbH Dispositif formant organe d'agitation
US11623185B2 (en) 2019-01-25 2023-04-11 Ekato Rühr-und Mischtechnik GmbH Stirring element device
RU2801134C2 (ru) * 2019-01-25 2023-08-02 Экато Рюр- Унд Миштехник Гмбх Устройство перемешивающей установки
CN111804041A (zh) * 2020-08-31 2020-10-23 烟台熙成环保技术有限公司 一种废水处理用微滤机及其废水处理方法

Also Published As

Publication number Publication date
EP1243313A3 (fr) 2004-09-01
ITPC20010014A1 (it) 2002-09-23

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