EP0993862A1 - Self-sucking rotary dispersing device - Google Patents

Self-sucking rotary dispersing device Download PDF

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Publication number
EP0993862A1
EP0993862A1 EP99120397A EP99120397A EP0993862A1 EP 0993862 A1 EP0993862 A1 EP 0993862A1 EP 99120397 A EP99120397 A EP 99120397A EP 99120397 A EP99120397 A EP 99120397A EP 0993862 A1 EP0993862 A1 EP 0993862A1
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EP
European Patent Office
Prior art keywords
self
gas
dispersing device
priming
hollow shaft
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EP99120397A
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German (de)
French (fr)
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EP0993862B1 (en
EP0993862B2 (en
Inventor
Peter Dipl.-Ing. Forschner
Rainer Dr.-Ing. Krebs
Hans-Jürgen Dipl.-Ing. Weis
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EKATO Ruehr und Mischtechnik GmbH
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EKATO Ruehr und Mischtechnik GmbH
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    • 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
    • B01F23/23311—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 through a hollow stirrer axis
    • 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
    • B01F27/111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow
    • 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
    • B01F23/20—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
    • B01F23/23314—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 through a hollow stirrer element
    • 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
    • B01F23/2335—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 direction of introduction of the gas relative to the stirrer
    • B01F23/23354—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 direction of introduction of the gas relative to the stirrer the gas being driven away from the rotating 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/15—Stirrers with tubes for guiding the 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2335—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 direction of introduction of the gas relative to the stirrer
    • B01F23/23352—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 direction of introduction of the gas relative to the stirrer the gas moving perpendicular to the axis of rotation

Definitions

  • the invention therefore aims to overcome the difficulties described above a powerful, self - priming dispersing device for gases and To provide liquids or two-phase turbines, which has a higher mass transfer with the cheapest possible Performance / entry ratios and speed of the dispersing device allowed.
  • Dispersing device are therefore several gas channels with the Hollow shaft connected via gas channel openings allow the gas to be dispersed to be discharged.
  • the invention By separately guiding the gas to be dispersed within the self-priming disperser the invention is therefore the dispersing device according to the Invention no restrictions by predetermined phase relationships Subject to gas / liquid. So you get according to the invention an extremely powerful and one high self-priming rotating dispersing device or self-priming Two phase turbine.
  • the gas channels run approximately radial to the hollow shaft.
  • the gas channels under run at an acute angle to the radial which preferably in a range of greater than 0 and less than 25 ° lies and is in particular about 15 °.
  • gas channels can be in the form of impellers be trained to pump the fluid thereby intensify.
  • each gas channel opening lies in a plane at an acute angle for gas channel wall, which is preferably in one area are from 30 ° to 60 ° and in particular is approximately 50 °. This allows the mass transfer due to the enlarged Improve contact areas even further.
  • rotating dispersing device are the gas channels arranged at regular angular intervals in the circumferential direction, in order to be as uniform as possible in the circumferential direction Ensure mixing of gas and liquid.
  • the self-priming, rotating dispersing device is a cover plate on the top and bottom of the gas channels provided which is axially to the rotationally driven Hollow shaft are spaced and between them in cooperation chambers are formed with the gas channels.
  • the bottom cover plate can be a closed and form surface connected to the hollow shaft.
  • the top Cover plate preferably forms a liquid suction gap in cooperation with the outer surface of the hollow shaft. Liquid enters the chambers via this suction gap between the two axially spaced washers and the outer surfaces of the gas channels, the one intensive agitation movement to strengthen the mass transfer is granted.
  • the gas channel openings are preferably opposite the direction of rotation of the hollow shaft, so that the intensive mixing of gas and liquid on the area of the gas channels facing away from the flow.
  • the underside cover plate 6 forms a closed surface and is firmly connected to the outer wall of the hollow shaft 2 and the corresponding outer surface of the gas channels 3.
  • the top cover plate 5 is designed as an annular body and concentrically surrounds the hollow shaft 2 and forms an annular gap 7 between the outer wall of the hollow shaft 2, which serves for liquid suction into the chambers 8 delimited between the two cover plates 5 and 6 and the gas channels 3.
  • the cover plates 5 and 6 can be integrally connected to the gas channels 3 accordingly.
  • the largest outer diameter of the dispersing device 1 is denoted by D 2 and is measured between the outer edges of two opposite gas channel mouth openings.
  • the dispersing device 1 due to the stall at the gas channel openings 4 generates a negative pressure, through which gas from the gas space and the gas channels 3 against the static liquid level is sucked in above the dispersing device 1.
  • This sucked in and to be dispersed gas is inside the dispersing device 1 in a line system without Mixing with liquid through the gas channel openings 4 and there is a mixture of gas and liquid to be dispersed outside the Dispersing device 1 in the area around the gas channel openings 4.
  • the gas channels 3 cause rotation the hollow shaft 2 intensive liquid delivery and agitation also in cooperation with the chambers 8.
  • the gas channels 3 have a curved course and have an impeller-like shape. As a result, the fluid delivery can be further increased.
  • the radius of curvature is in a range E 2/3 to 3D 2, preferably at about D 2/2.
  • the Gas channels 3 a cross section, which, starting from the Connection to the hollow shaft 2 in the gas flow direction gets bigger. This allows the mass transfer from gas to liquid. Also receives one also further favorable mass transfer ratios, that the gas channel orifices 4 against the Direction of rotation of the hollow shaft 2 are directed.
  • Dispersing device 1 are essentially the basic construction elements consistent with the embodiment designed according to Figure 1. These parts are therefore below not explained again, but only the differences compared to the design according to the figure 1. Essentially only the gas channels 3 'have a figure 1 different design.
  • Figure 4 shows another embodiment variant in the form a modification to the embodiment of the dispersing device 1 according to Figure 3.
  • the gas channels 3 '' ' In deviation from this which communicating in the hollow interior of the hollow shaft 2 Connected gas channels 3 '' 'essentially one constant cross-section over its entire course starting from the hollow shaft 2 to the gas channel opening 4.Otherwise, the gas channels 3 '' ' also essentially radial to the hollow shaft 2 and each have an opening cross section in the area of Gas channel opening 4 in a plane below one acute angle ⁇ to the gas duct wall.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Dowels (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Catching Or Destruction (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The rotary dispersal turbine has a rotating hollow shaft (2) which operates as the gas inlet. Gas flows from the hollow shaft through radial passages (3) to the peripheral gas outlets (4) which rotate within the liquid.

Description

Die Erfindung befaßt sich mit einer selbstansaugenden, rotierenden Dispergiervorrichtung für Gase und Flüssigkeiten mit einer drehangetriebenen Hohlwelle zur Gasansaugung. Insbesondere bezieht sich die Erfindung auf eine selbstansaugende Zweiphasenturbine zur Durchmischung von Gasen und Flüssigkeiten.The invention is concerned with a self-priming, rotating dispersing device for gases and liquids with a rotary driven hollow shaft for gas intake. In particular, the invention relates to a self-priming Two-phase turbine for mixing gases and liquids.

Bei üblichen Dispergiervorrichtungen oder selbstansaugenden Zweiphasenturbinen der vorstehend genannten Art erfolgt die Gasansaugung über die drehangetriebene Hohlwelle und in den Innenraum der Turbine wird auch Flüssigkeit eingeleitet, so daß die Durchmischung von Gas und Flüssigkeit innerhalb des Turbinenraums erfolgt. Eine solche selbstansaugende Zweiphasenturbine arbeitet bis zu einem Phasenverhältnis Gas/Flüssigkeit von etwa 25/30 % zufriedenstellend. Bei größeren Phasenverhältnissen ist die selbstansaugende Zweiphasenturbine überflutet und selbst bei einer Drehzahlsteigerung ist kein höherer Leistungseintrag mehr möglich, da die angesaugte Gasmenge in Ruhe verharrt und ein höherer Stoffübergang nicht mehr möglich ist. Daher ist die übliche, selbstansaugende Zweiphasenturbine bauartbedingt hinsichtlich des Stoffübergangs durch das vorgegebene Phasenverhältnis Gas/Flüssigkeit beschränkt. With conventional dispersing devices or self-priming Two-phase turbines of the type mentioned above take place Gas intake via the rotating hollow shaft and into the Liquid is also introduced into the interior of the turbine, so that the mixing of gas and liquid within of the turbine space. Such a self-priming Two-phase turbine works up to a phase relationship Gas / liquid of about 25/30% satisfactory. At larger phase relationships is the self-priming Two-phase turbine flooded and even with an increase in speed a higher power input is no longer possible, since the amount of gas sucked in remains at rest and a higher one Mass transfer is no longer possible. Hence the Usual, self-priming two-phase turbine due to its design with regard to the mass transfer by the given Limited gas / liquid phase ratio.

Die Erfindung zielt daher darauf ab, unter Überwindung der zuvor geschilderten Schwierigkeiten eine leistungsstarke, selbstansaugende Dispergiervorrichtung für Gase und Flüssigkeiten bzw. Zweiphasenturbine bereitzustellen, welche einen höheren Stoffübergang bei möglichst günstigen Leistungs-/Eintragsverhältnissen und Drehzahl der Dispergiervorrichtung gestattet.The invention therefore aims to overcome the difficulties described above a powerful, self - priming dispersing device for gases and To provide liquids or two-phase turbines, which has a higher mass transfer with the cheapest possible Performance / entry ratios and speed of the dispersing device allowed.

Nach der Erfindung wird hierzu eine selbstansaugende, rotierende Dispergiervorrichtung für Gase und Flüssigkeiten mit einer drehangetriebenen Hohlwelle zur Gasansaugung bereitgestellt, welche sich dadurch auszeichnet, daß das zu dispergierende Gas von der Hohlwelle über hiermit in kommunizierender Verbindung stehende Gaskanäle getrennt von der Flüssigkeit zu in Umfangsrichtung beabstandeten Gaskanal-Mündungsöffnungen strömt, an welchem die Vermischung von Gas und Flüssigkeit außerhalb der Dispergiervorrichtung erfolgt.According to the invention, a self-priming, rotating dispersing device for gases and liquids with a rotary driven hollow shaft for gas intake Provided, which is characterized in that the gas to be dispersed from the hollow shaft via this communicating gas channels separated from the liquid to be circumferentially spaced Gas channel orifices flows at which the mixing of gas and liquid outside the disperser he follows.

Bei der erfindungsgemäßen, selbstansaugenden rotierenden Dispergiervorrichtung sind daher mehrere Gaskanäle mit der Hohlwelle verbunden, die über Gaskanal-Mündungsöffnungen eine Ausleitung des zu dispergierenden Gases gestatten. An den Gaskanal-Mündungsöffnungen wird durch den Strömungsabriß ein Unterdruck erzeugt, welcher ermöglicht, daß das Gas aus dem Gasraum entgegen der statischen Flüssigkeitshöhe über der Dispergiervorrichtung angesaugt wird. Somit wird eine ständige Gasansaugung bei der erfindungsgemäßen Dispergiervorrichtung unabhängig von dem Phasenverhältnis Gas/Flüssigkeit aufgrund der Strömungsabrißerscheinung an der Gaskanal-Mündungsöffnung gewährleistet. Ferner erfolgt bei der erfindungsgemäßen Dispergiervorrichtung die Vermischung von Gas und Flüssigkeit außerhalb des Innenraums der Dispergiervorrichtung, nämlich in dem Bereich der Gaskanal-Mündungsöffnungen, da die bei der erfindungsgemäßen Dispergiervorrichtung vorgesehenen Gaskanäle nur zu dispergierendes Gas und keine Flüssigkeit führen. Bei der Drehbewegung der Dispergiervorrichtung erzeugen die Gaskanäle ferner eine intensive Flüssigkeitsförderung, Flüssigkeitsbewegung und Flüssigkeitsumwälzung, so daß man einen hohen Stoffübergang durch die intensive Kontaktierung der bewegten Flüssigkeit mit dem angesaugten und dispergierten Gas erreicht.In the self-priming rotating according to the invention Dispersing device are therefore several gas channels with the Hollow shaft connected via gas channel openings allow the gas to be dispersed to be discharged. On the gas channel orifices is caused by the stall creates a vacuum that allows the Gas from the gas space against the static liquid level is sucked in above the dispersing device. Consequently is a constant gas intake in the invention Dispersing device regardless of the phase ratio Gas / liquid due to the stall phenomenon of the gas channel opening. It also takes place in the dispersing device according to the invention Mixing of gas and liquid outside the interior the dispersing device, namely in the area of Gas channel orifices, since those in the invention Dispersing device provided gas channels only lead to dispersing gas and no liquid. At the rotational movement of the dispersing device produce the Gas channels also an intensive fluid delivery, Fluid movement and circulation, so that one a high mass transfer due to the intensive contact the moving liquid with the sucked and dispersed Gas reached.

Durch die getrennte Führung des zu dispergierenden Gases innerhalb der selbstansaugenden Dispergiervorrichtung nach der Erfindung ist daher die Dispergiervorrichtung nach der Erfindung keinen Beschränkungen durch vorbestimmte Phasenverhältnisse Gas/Flüssigkeit unterworfen. Somit erhält man nach der Erfindung eine äußerst leistungsfähige und einen hohen Stoffübergang verwirklichende selbstansaugende, rotierende Dispergiervorrichtung bzw. selbstansaugende Zweiphasenturbine.By separately guiding the gas to be dispersed within the self-priming disperser the invention is therefore the dispersing device according to the Invention no restrictions by predetermined phase relationships Subject to gas / liquid. So you get according to the invention an extremely powerful and one high self-priming rotating dispersing device or self-priming Two phase turbine.

Eine weitere Leistungssteigerung einer solchen selbstansaugenden Dispergiervorrichtung und weitere Verbesserungen hinsichtlich des Wirkungsgrades lassen sich durch entsprechende Gestaltungen der Gaskanäle verwirklichen. Hierfür gibt es zahlreiche Möglichkeiten.Another increase in performance of such a self-priming Dispersing device and other improvements in terms of efficiency implement corresponding designs of the gas channels. There are numerous options for this.

Bei einer Ausführungsform verlaufen die Gaskanäle etwa radial zur Hohlwelle. Alternativ können die Gaskanäle unter einem spitzen Winkel zur Radialen verlaufen, welcher vorzugsweise in einem Bereich von größer 0 und kleiner 25° liegt und insbesondere etwa 15° beträgt.In one embodiment, the gas channels run approximately radial to the hollow shaft. Alternatively, the gas channels under run at an acute angle to the radial, which preferably in a range of greater than 0 and less than 25 ° lies and is in particular about 15 °.

Weiterhin können die Gaskanäle in Form von Rührflügeln ausgebildet werden, um die Flüssigkeitsförderung hierdurch zu intensivieren.Furthermore, the gas channels can be in the form of impellers be trained to pump the fluid thereby intensify.

Vorzugsweise sind bei der selbstansaugenden, rotierenden Dispergiervorrichtung nach der Erfindung die Gaskanäle mit einem gekrümmten Verlauf ausgebildet, so daß sie eine strömungsgünstige Profilierung hinsichtlich einer intensiven Flüssigkeitsförderung haben. Der Krümmungsradius hierbei kann in einem Bereich von D23 bis 3D2, vorzugsweise etwa bei etwa D2/2 liegen. Mit D2 ist der größte Durchmesser der Dispergiervorrichtung bezeichnet, welcher zwischen den Außenkanten von zwei gegenüberliegenden Gaskanalmündungsöffnungen gemessen wird.In the case of the self-priming, rotating dispersing device according to the invention, the gas channels are preferably designed with a curved course, so that they have a streamlined profile with regard to intensive liquid delivery. The radius of curvature here can be in a range from D 2 3 to 3D 2 , preferably approximately D 2/2 . D 2 denotes the largest diameter of the dispersing device, which is measured between the outer edges of two opposite gas channel mouth openings.

Insbesondere können die Gaskanäle einen Querschnitt haben, welcher ausgehend von der Hohlwelle zur Gaskanalmündungsöffnung größer wird. Hierdurch läßt sich die Ansaugung von Gas aus dem Gasraum aufgrund der Strömungsabrißerscheinung und des hierdurch erzeugten Unterdrucks im Gaskanalsystem verstärken.In particular, the gas channels can have a cross section, which starts from the hollow shaft to the gas channel opening gets bigger. This allows the suction of Gas from the gas space due to the stall phenomenon and the resulting negative pressure in the gas duct system reinforce.

Insbesondere liegt der Öffnungsquerschnitt jeder Gaskanal-Mündungsöffnung in einer Ebene unter einem spitzen Winkel zur Gaskanalwandung, welcher vorzugsweise in einem Bereich von 30° bis 60° liegen und insbesondere etwa 50° beträgt. Hierdurch läßt sich der Stoffübergang aufgrund der vergrößerten Kontaktflächen noch weiter verbessern.In particular, the opening cross-section of each gas channel opening lies in a plane at an acute angle for gas channel wall, which is preferably in one area are from 30 ° to 60 ° and in particular is approximately 50 °. This allows the mass transfer due to the enlarged Improve contact areas even further.

Gemäß einer bevorzugten Ausführungsform der selbstansaugenden, rotierenden Dispergiervorrichtung sind die Gaskanäle in regelmäßigen Winkelabständen in Umfangsrichtung angeordnet, um eine möglichst in Umfangsrichtung gleichförmige Durchmischung von Gas und Flüssigkeit zu gewährleisten.According to a preferred embodiment of the self-priming, rotating dispersing device are the gas channels arranged at regular angular intervals in the circumferential direction, in order to be as uniform as possible in the circumferential direction Ensure mixing of gas and liquid.

Gemäß einer weiteren Ausgestaltungsform der selbstansaugenden, rotierenden Dispergiervorrichtung nach der Erfindung ist oberseitig und unterseitig der Gaskanäle eine Deckscheibe vorgesehen, welche axial zur drehangetriebenen Hohlwelle beabstandet sind und zwischen denen im Zusammenwirken mit den Gaskanälen Kammern gebildet werden. Die unterseitige Deckscheibe kann hierbei eine geschlossene und mit der Hohlwelle verbundene Fläche bilden. Die oberseitige Deckscheibe bildet vorzugsweise einen Flüssigkeits-Ansaugspalt im Zusammenwirken mit der Außenfläche der Hohlwelle. Über diesen Ansaugspalt wird Flüssigkeit in die Kammern zwischen den beiden axial beabstandeten Deckscheiben und den Außenflächen der Gaskanäle eingeleitet, der eine intensive Agitationsbewegung zur Verstärkung des Stoffübergangs erteilt wird.According to a further embodiment of the self-priming, rotating dispersing device according to the invention is a cover plate on the top and bottom of the gas channels provided which is axially to the rotationally driven Hollow shaft are spaced and between them in cooperation chambers are formed with the gas channels. The bottom cover plate can be a closed and form surface connected to the hollow shaft. The top Cover plate preferably forms a liquid suction gap in cooperation with the outer surface of the hollow shaft. Liquid enters the chambers via this suction gap between the two axially spaced washers and the outer surfaces of the gas channels, the one intensive agitation movement to strengthen the mass transfer is granted.

Vorzugsweise sind die Gaskanal-Mündungsöffnungen entgegen der Drehrichtung der Hohlwelle gerichtet, so daß die intensive Durchmischung von Gas und Flüssigkeit an dem strömungsabgewandten Bereich der Gaskanäle erfolgt.The gas channel openings are preferably opposite the direction of rotation of the hollow shaft, so that the intensive mixing of gas and liquid on the area of the gas channels facing away from the flow.

Die Erfindung wird nachstehend an Hand von bevorzugten Ausführungsformen unter Bezugnahme auf die beigefügte Zeichnung näher erläutert. Darin zeigt:

Fig. 1
eine schematische perspektivische Ansicht einer ersten Ausführungsform einer selbstansaugenden, rotierenden Dispergiervorrichtung oder einer selbstansaugenden Zweiphasenturbine nach der Erfindung,
Fig. 2
eine schematische Draufsicht auf eine Ausführungsvariante einer Dispergiervorrichtung nach der Erfindung,
Fig. 3
eine schematische Draufsicht auf eine weitere Ausführungsvariante einer Dispergiervorrichtung nach der Erfindung, und
Fig. 4
eine schematische Draufsicht auf eine weitere Ausführungsform einer Dispergiervorrichtung nach der Erfindung.
The invention is explained below with reference to preferred embodiments with reference to the accompanying drawings. It shows:
Fig. 1
2 shows a schematic perspective view of a first embodiment of a self-priming, rotating dispersing device or a self-priming two-phase turbine according to the invention,
Fig. 2
2 shows a schematic top view of an embodiment variant of a dispersing device according to the invention,
Fig. 3
is a schematic plan view of a further embodiment of a dispersing device according to the invention, and
Fig. 4
is a schematic plan view of a further embodiment of a dispersing device according to the invention.

In Figur 1 ist in einer perspektivischen Ansicht eine insgesamt mit 1 bezeichnete selbstansaugende, rotierende Dispergiervorrichtung oder eine selbstansaugende Zweiphasenturbine gezeigt. Die Dispergiervorrichtung 1 weist eine zentrale Hohlwelle 2 auf, welche über einen nicht näher dargestellten Drehantrieb in die mit dem Pfeil angedeutete Drehrichtung angetrieben wird. In den von der Hohlwelle 2 gebildeten Hohlraum wird Gas oder zu dispergierendes Gas angesaugt. Mit dem durch die Hohlwelle 2 begrenzten Innenraum stehen mehrere in Umfangsrichtung vorzugsweise in regelmäßigen Winkelabständen angeordnete Gaskanäle 3 in kommunizierender Verbindung, welche Gaskanal-Mündungsöffnungen 4 haben, die bei dem dargestellten Beispiel entgegen der Drehrichtung der Hohlwelle 2 gerichtet sind. Oberseitig und unterseitig ist bei der Dispergiervorrichtung 1 jeweils eine Deckscheibe 5, 6 angeordnet. Die unterseitige Deckscheibe 6 bildet eine geschlossene Fläche und ist mit der Außenwand der Hohlwelle 2 und den entsprechenden Außenfläche der Gaskanäle 3 fest verbunden. Die oberseitige Deckscheibe 5 ist als Ringkörper ausgebildet und umgibt die Hohlwelle 2 konzentrisch und bildet zwischen der Außenwand der Hohlwelle 2 einen Ringspalt 7, welcher zur Flüssigkeitsansaugung in die zwischen den beiden Deckscheiben 5 und 6 und die Gaskanäle 3 begrenzten Kammern 8 dient. Die Deckscheiben 5 und 6 können integral mit den Gaskanälen 3 entsprechend verbunden sein. Der größte Außendurchmesser der Dispergiervorrichtung 1 ist mit D2 bezeichnet und wird zwischen den Außenkanten von zwei gegenüberliegenden Gaskanalmündungsöffnungen gemessen.FIG. 1 shows a perspective view of a self-priming, rotating dispersing device, generally designated 1, or a self-priming two-phase turbine. The dispersing device 1 has a central hollow shaft 2, which is driven in the direction of rotation indicated by the arrow via a rotary drive, not shown. Gas or gas to be dispersed is sucked into the cavity formed by the hollow shaft 2. With the inner space delimited by the hollow shaft 2, a plurality of gas channels 3, which are preferably arranged at regular angular intervals in the circumferential direction, are in communicating connection and have gas channel mouth openings 4 which, in the example shown, are directed against the direction of rotation of the hollow shaft 2. A cover plate 5, 6 is arranged on the top and bottom of the dispersing device 1. The underside cover plate 6 forms a closed surface and is firmly connected to the outer wall of the hollow shaft 2 and the corresponding outer surface of the gas channels 3. The top cover plate 5 is designed as an annular body and concentrically surrounds the hollow shaft 2 and forms an annular gap 7 between the outer wall of the hollow shaft 2, which serves for liquid suction into the chambers 8 delimited between the two cover plates 5 and 6 and the gas channels 3. The cover plates 5 and 6 can be integrally connected to the gas channels 3 accordingly. The largest outer diameter of the dispersing device 1 is denoted by D 2 and is measured between the outer edges of two opposite gas channel mouth openings.

Bei der erfindungsgemäßen Dispergiervorrichtung 1 wird durch den Strömungsabriß an den Gaskanal-Mündungsöffnungen 4 ein Unterdruck erzeugt, durch welchen Gas aus dem Gasraum und den Gaskanälen 3 entgegen der statischen Flüssigkeitshöhe über der Dispergiervorrichtung 1 angesaugt wird. Dieses angesaugte und zu dispergierende Gas wird innerhalb der Dispergiervorrichtung 1 in einem Leitungssystem ohne Vermischung mit Flüssigkeit über die Gaskanal-Mündungsöffnungen 4 ausgeleitet und es erfolgt eine Vermischung von zu dispergierendem Gas und Flüssigkeit außerhalb der Dispergiervorrichtung 1 im Bereich um die Gaskanal-Mündungsöffnungen 4. Die Gaskanäle 3 bewirken bei der Drehbewegung der Hohlwelle 2 eine intensive Flüssigkeitsförderung und Agitation auch im Zusammenwirken mit den Kammern 8. Somit wird ein intensiver Kontakt zwischen dem über die Gaskanal-Mündungsöffnungen 4 austretenden, über die Hohlwelle 2 selbstangesaugten Gas und der intensiv bewegten Flüssigkeit um die Gaskanal-Mündungsöffnungen 4 erreicht. Hierdurch erhält man einen hohen Stoffübergang bei der erfindungsgemäßen Dispergiervorrichtung 1.In the dispersing device 1 according to the invention due to the stall at the gas channel openings 4 generates a negative pressure, through which gas from the gas space and the gas channels 3 against the static liquid level is sucked in above the dispersing device 1. This sucked in and to be dispersed gas is inside the dispersing device 1 in a line system without Mixing with liquid through the gas channel openings 4 and there is a mixture of gas and liquid to be dispersed outside the Dispersing device 1 in the area around the gas channel openings 4. The gas channels 3 cause rotation the hollow shaft 2 intensive liquid delivery and agitation also in cooperation with the chambers 8. Thus an intensive contact between the over the Gas channel orifices 4 emerging, over the Hollow shaft 2 self-sucked gas and the intensely moving Liquid around the gas channel orifices 4 reached. This gives you a high mass transfer at Dispersing device 1 according to the invention.

Bei der in Figur 1 dargestellten Ausführungsform der Dispergiervorrichtung 1 haben die Gaskanäle 3 einen gekrümmten Verlauf und haben eine rührflügelähnliche Gestalt. Hierdurch kann die Flüssigkeitsförderung weiter verstärkt werden. Der Krümmungsradius liegt in einem Bereich D2/3 bis 3D2, vorzugsweise bei etwa D2/2.In the embodiment of the dispersing device 1 shown in FIG. 1, the gas channels 3 have a curved course and have an impeller-like shape. As a result, the fluid delivery can be further increased. The radius of curvature is in a range E 2/3 to 3D 2, preferably at about D 2/2.

Wie ebenfalls aus Figur 1 zu ersehen ist, haben die Gaskanäle 3 einen Querschnitt, welcher ausgehend von der Anschlußverbindung mit der Hohlwelle 2 in Gasströmungsrichtung größer wird. Hierdurch läßt sich der Stoffübergang von Gas zu Flüssigkeit noch weiter verstärkten. Auch erhält man ferner noch dadurch günstige Stoffübergangsverhältnisse, daß die Gaskanal-Mündungsöffnungen 4 entgegen der Drehrichtung der Hohlwelle 2 gerichtet sind.As can also be seen from Figure 1, the Gas channels 3 a cross section, which, starting from the Connection to the hollow shaft 2 in the gas flow direction gets bigger. This allows the mass transfer from gas to liquid. Also receives one also further favorable mass transfer ratios, that the gas channel orifices 4 against the Direction of rotation of the hollow shaft 2 are directed.

Bei der Ausführungsform der in Figur 2 dargestellten Dispergiervorrichtung 1 sind im wesentlichen die Grundkonstruktionselemente übereinstimmend mit der Ausführungsform nach Figur 1 ausgelegt. Diese Teile werden daher nachstehend nicht nochmals näher erläutert, sondern lediglich die Unterschiede gegenüber der Ausgestaltung nach Figur 1.Im wesentlichen haben nur die Gaskanäle 3' eine von Figur 1 abweichende Ausgestaltungsform.In the embodiment shown in Figure 2 Dispersing device 1 are essentially the basic construction elements consistent with the embodiment designed according to Figure 1. These parts are therefore below not explained again, but only the differences compared to the design according to the figure 1. Essentially only the gas channels 3 'have a figure 1 different design.

Wie aus Figur 2 zu ersehen ist, haben die Gaskanäle 3' einen geradlinigen Verlauf und verlaufen unter einem spitzen Winkel α zur Radialen. Dieser spitze Winkel α liegt vorzugsweise in einem Bereich von größer 0 und kleiner 25° und beträgt vorzugsweise etwa 15°. Auch diese Gaskanäle 3' haben wie in Figur 1 einen Querschnitt, welcher ausgehend von der Hohlwelle 2 zur Gaskanal-Mündungsöffnung 4 größer wird. Der Öffnungsquerschnitt jeder Gaskanal-Mündungsöffnung 4 liegt in einer Ebene unter einem spitzen Winkel β zur Gaskanalwandung, welcher vorzugsweise innerhalb eines Winkelbereiches von 30° bis 60° liegt und insbesondere etwa 50° beträgt.As can be seen from Figure 2, the gas channels 3 ' a straight line and run under one acute angle α to the radial. This acute angle α lies preferably in a range of greater than 0 and less than 25 ° and is preferably about 15 °. These gas channels 3 ' have a cross section as in Figure 1, which starts from the hollow shaft 2 to the gas channel opening 4 larger becomes. The opening cross section of each gas channel opening 4 lies in a plane at an acute angle β for gas channel wall, which is preferably within a Angular range from 30 ° to 60 ° and in particular approximately Is 50 °.

Die Dispergiervorrichtung nach Figur 3 weist ebenfalls in Umfangsrichtung in regelmäßigen Winkelabständen angeordnete Gaskanäle 3'' auf, welche ähnlich wie bei Figur 2 einen geradlinigen Verlauf haben sowie einen Querschnitt besitzen, welcher ausgehend von der Hohlwelle 2 zur Gaskanal-Mündungsöffnung 4 größer wird. Auch ist der Öffnungsquerschnitt jeder Gaskanal-Mündungsöffnung 4 in einer Ebene unter einem spitzen Winkel β zur Gaskanalwandung angeordnet, welcher vorzugsweise in einem Bereich von 30° bis 60° liegt und insbesondere etwa 50° beträgt. In Abweichung von der Ausführungsform nach Abbildung 2 verlaufen aber die Gaskanäle 3'' etwa radial zur Hohlwelle 2. Ansonsten stimmen alle weiteren Einzelheiten der in Figur 3 gezeigten Dispergiervorrichtung 1 im wesentlichen mit jenen überein, welche im Zusammenhang mit Figur 1 zuvor erläutert wurden.The dispersing device according to FIG Arranged circumferentially at regular angular intervals Gas channels 3 '', which similar to Figure 2 one have a straight course and a cross-section, which starting from the hollow shaft 2 to the gas channel opening 4 gets bigger. Also the opening cross section each gas channel opening 4 in one plane arranged at an acute angle β to the gas duct wall, which is preferably in a range from 30 ° to 60 ° lies and is in particular about 50 °. In deviation from the embodiment of Figure 2, however, run Gas channels 3 '' approximately radial to the hollow shaft 2. Otherwise vote all further details of those shown in Figure 3 Dispersing device 1 essentially corresponds to those which were previously explained in connection with Figure 1.

Figur 4 zeigt eine weitere Ausführungsvariante in Form einer Abwandlung gegenüber der Ausführungsform der Dispergiervorrichtung 1 nach Figur 3. In Abweichung hiervon haben die in dem hohlen Innenraum der Hohlwelle 2 in kommunizierender Verbindung stehenden Gaskanäle 3''' einen im wesentlichen konstanten Querschnitt über ihren gesamten Verlauf hinweg ausgehend von der Hohlwelle 2 bis zur Gaskanal-Mündungsöffnung 4. Ansonsten verlaufen die Gaskanäle 3''' ebenfalls im wesentlichen radial zur Hohlwelle 2 und besitzen jeweils einen Öffnungsquerschnitt im Bereich der Gaskanal-Mündungsöffnung 4 in einer Ebene unter einem spitzen Winkel β zur Gaskanalwandung.Figure 4 shows another embodiment variant in the form a modification to the embodiment of the dispersing device 1 according to Figure 3. In deviation from this which communicating in the hollow interior of the hollow shaft 2 Connected gas channels 3 '' 'essentially one constant cross-section over its entire course starting from the hollow shaft 2 to the gas channel opening 4.Otherwise, the gas channels 3 '' ' also essentially radial to the hollow shaft 2 and each have an opening cross section in the area of Gas channel opening 4 in a plane below one acute angle β to the gas duct wall.

Die Erfindung ist natürlich nicht auf die voranstehend beschriebenen Ausführungsformen und deren Einzelheiten beschränkt, sondern es sind zahlreiche Abänderungen und Modifikationen möglich, die der Fachmann im Bedarfsfall treffen wird, ohne den Erfindungsgedanken zu verlaufen. Insbesondere sind Kombinationen von unterschiedlich ausgestalteten Gaskanälen mit entsprechend unterschiedlicher Anordnung zur Hohlwelle möglich, wobei insbesondere auch kombinierte Verläufe von geradlinig und gekrümmt in Betracht kommen sowie auch Kombinationen mit abgestuft verlaufenden Querschnitten der Gaskanäle. Alle diese Ausführungsvarianten und Weiterbildungen werden vom Schutzgegenstand nach der Erfindung mit umfaßt. The invention is of course not based on those described above Embodiments and their details limited but there are numerous changes and Modifications possible, which the specialist in case of need will meet without getting lost in the idea of the invention. In particular, combinations of are different designed gas channels with correspondingly different Arrangement to the hollow shaft possible, in particular also combined courses of straight and curved in Consider as well as combinations with graded running cross sections of the gas channels. All these Design variants and further training are from Subject of protection according to the invention includes.

BezugszeichenlisteReference list

11
Dispergiervorrichtung insgesamtTotal dispersing device
22nd
HohlwelleHollow shaft
33rd
Gaskanäle in Figur 1Gas channels in Figure 1
3'3 '
Gaskanäle in Figur 2Gas channels in Figure 2
3''3 ''
Gaskanäle in Figur 3Gas channels in Figure 3
3'''3 '' '
Gaskanäle in Figur 4Gas channels in Figure 4
44th
Gaskanal-MündungsöffnungenGas channel mouth openings
55
Deckscheibe obenTop cover disc
66
Deckscheibe untenCover plate below
77
RingspaltAnnular gap
88th
Kammerchamber
D2 D 2
Außendurchmesser der Dispergiervorrichtung 1Outside diameter of the dispersing device 1

Claims (13)

Selbstansaugende, rotierende Dispergiervorrichtung für Gase und Flüssigkeiten (selbstansaugende Zweiphasenturbine) mit einer drehangetriebenen Hohlwelle (2) zur Gasansaugung, dadurch gekennzeichnet, daß das zu dispergierende Gas von der Hohlwelle (2) über hiermit in kommunizierender Verbindung stehende Gaskanäle (3, 3', 3'', 3''') getrennt von der Flüssigkeit zu in Umfangsrichtung beabstandeten Gaskanal-Mündungsöffnungen (4) strömt, an welchen die Vermischung von Gas und Flüssigkeit außerhalb der Dispergiervorrichtung (1) erfolgt.Self-priming, rotating dispersing device for gases and liquids (self-priming two-phase turbine) with a rotationally driven hollow shaft (2) for gas suction, characterized in that the gas to be dispersed from the hollow shaft (2) via gas channels (3, 3 ', 3 in communicating therewith) '', 3 ''') flows separately from the liquid to circumferentially spaced gas channel openings (4) at which the gas and liquid are mixed outside the dispersing device (1). Selbstansaugende, rotierende Dispergiervorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Gaskanäle (3'', 3''') etwa radial zur Hohlwelle (2) verlaufen.Self-priming, rotating dispersing device according to claim 1, characterized in that the gas channels (3 '', 3 ''') run approximately radially to the hollow shaft (2). Selbstansaugende, rotierende Dispergiervorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Gaskanäle (3') unter einem spitzen Winkel (α) zur Radialen verlaufen, welcher vorzugsweise in einem Bereich von größer 0 und kleiner 25° liegt, und insbesondere etwa 15°, beträgt. Self-priming, rotating dispersing device according to claim 1, characterized in that the gas channels (3 ') run at an acute angle (α) to the radial, which is preferably in a range from greater than 0 and less than 25 °, and in particular about 15 ° . Selbstansaugende, rotierende Dispergiervorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Gaskanäle (3, 3',3'', 3''') in Form von Rührflügeln ausgebildet sind.Self-priming, rotating dispersing device according to one of claims 1 to 3, characterized in that the gas channels (3, 3 ', 3'',3''') are designed in the form of stirring blades. Selbstansaugende, rotierende Dispergiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Gaskanäle (3) einen gekrümmten Verlauf haben.Self-priming, rotating dispersing device according to one of the preceding claims, characterized in that the gas channels (3) have a curved course. Selbstansaugende, rotierende Dispergiervorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß der Krümmungsradius in einem Bereich von D2/3 bis 3D2, vorzugsweise bei etwa D2/2 liegt, wobei D2 der größte Durchmesser zwischen den Außenkanten von zwei gegenüberliegenden Gaskanalmündungsöffnungen ist.Self-priming, rotating dispersing device according to claim 5, characterized in that the radius of curvature is in a range from D 2/3 to 3D 2 , preferably approximately D 2/2 , D 2 being the largest diameter between the outer edges of two opposite gas channel mouth openings. Selbstansaugende, rotierende Dispergiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Gaskanäle (3, 3', 3'') einen Querschnitt haben, welcher ausgehend von der Hohlwelle (2) zur Gaskanal-Mündungsöffnung (4) größer wird.Self-priming, rotating dispersing device according to one of the preceding claims, characterized in that the gas channels (3, 3 ', 3'') have a cross section which increases from the hollow shaft (2) to the gas channel opening (4). Selbstansaugende, rotierende Dispergiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Öffnungsquerschnitt jeder Gaskanal-Mündungsöffnung (4) in einer Ebene unter einem spitzen Winkel (β) zur Gaskanalwandung angeordnet ist, welcher vorzugsweise in einem Bereich von 30° bis 60° liegt, insbesondere etwa 50° beträgt.Self-priming, rotating dispersion device according to one of the preceding claims, characterized in that the opening cross section of each gas channel opening (4) is arranged in a plane at an acute angle (β) to the gas channel wall, which is preferably in a range from 30 ° to 60 ° , in particular about 50 °. Selbstansaugende, rotierende Dispergiervorrichtung nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Gaskanäle (3, 3', 3'', 3''') in regelmäßigen Winkelabständen in Umfangsrichtung angeordnet sind. Self-rotating dispersing device according to one of the preceding claims, characterized in that the gas channels (3, 3 ', 3', 3 '''') are arranged at regular angular intervals in the circumferential direction. Selbstansaugende, rotierende Dispergiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Gaskanal-Mündungsöffnungen (4) entgegen der Drehrichtung der Hohlwelle (2) gerichtet sind.Self-priming, rotating dispersing device according to one of the preceding claims, characterized in that the gas channel openings (4) are directed against the direction of rotation of the hollow shaft (2). Selbstansaugende, rotierende Dispergiervorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß oberseitig und unterseitig der Gaskanäle (3, 3', 3'', 3''') eine Deckscheibe (5, 6) vorgesehen ist.Self-priming, rotating dispersing device according to one of the preceding claims, characterized in that a cover plate (5, 6) is provided on the top and bottom of the gas channels (3, 3 ', 3'',3'''). Selbstansaugende, rotierende Dispergiervorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die oberseitige Deckscheibe (5) einen Flüssigkeitsansaugspalt (7) im Zusammenwirken mit der Außenfläche der Hohlwelle (2) bildet.Self-priming, rotating dispersing device according to claim 11, characterized in that the top cover disc (5) forms a liquid suction gap (7) in cooperation with the outer surface of the hollow shaft (2). Selbstansaugende, rotierende Dispergiervorrichtung nach Anspruch 11 oder 12, dadurch gekennzeichnet, daß die unterseitige Deckscheibe (6) eine geschlossene und mit der Außenfläche der Hohlwelle (2) verbundene Fläche bildet.Self-priming, rotating dispersing device according to claim 11 or 12, characterized in that the cover plate (6) on the underside forms a closed surface which is connected to the outer surface of the hollow shaft (2).
EP99120397A 1998-10-13 1999-10-13 Self-sucking rotatable dispersing device Expired - Lifetime EP0993862B2 (en)

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DK0993862T4 (en) 2007-05-07
DK0993862T3 (en) 2003-09-29
EP0993862B1 (en) 2003-06-04
DE59905813D1 (en) 2003-07-10
US6394430B1 (en) 2002-05-28
EP0993862B2 (en) 2006-12-27
ATE242043T1 (en) 2003-06-15
DE29818255U1 (en) 2000-02-17

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