EP0516921A1 - Gasing stirrer - Google Patents
Gasing stirrer Download PDFInfo
- Publication number
- EP0516921A1 EP0516921A1 EP92102519A EP92102519A EP0516921A1 EP 0516921 A1 EP0516921 A1 EP 0516921A1 EP 92102519 A EP92102519 A EP 92102519A EP 92102519 A EP92102519 A EP 92102519A EP 0516921 A1 EP0516921 A1 EP 0516921A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow
- openings
- blades
- gas
- gassing
- 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.)
- Granted
Links
Images
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
- B01F23/20—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
- 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
- B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis
- B01F27/1151—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis with holes on the surface
Definitions
- the invention relates to a gassing stirrer with a rotatable hollow shaft and at least one hollow stirring element arranged thereon, the hollow space of which is connected to the hollow shaft and has openings towards the liquid to be gassed.
- stirrers are generally already known as hollow stirrers.
- the stirring elements of such hollow stirrers are designed as tubular stirrers or three-way stirrers (see F. Kneule, Stirring, Practice of Process Engineering, Volume 1, German Society for Technical Appliances, Frankfurt / Main, 1986, pp. 76, 77).
- Pipe stirrers consist of hollow tubular pieces protruding radially from the rotatable hollow shaft, while the three-stirrer consists of a hollow triangular disk, at the corners of which corresponding openings are provided for the gas to exit.
- These hollow stirrers are self-gassing stirrers, ie they suck gas from the space above the liquid and distribute it in the liquid due to the suction effect created by the stirrer rotation.
- the gas throughput can be independent of the stirring power or Stirrer speed vary.
- gas can be dispersed by means of forced gassing even with a higher liquid viscosity.
- the broad spectrum of bubbles forming in low-viscosity liquids has a disadvantage in the case of the known forced gassing by means of lances or single or multi-ring showers. This means that the gas bubbles generated have very different diameters. Large bubbles form in the trailing area of the agitator blades, which escape very quickly from the liquid and thus make only a minor contribution to the desired exchange of gas and liquid.
- the object of the present invention is to provide a gassing stirrer of the type mentioned at the beginning, with which the effectiveness of the gassing of liquids and thus an improvement in the exchange of substances is achieved, while on the other hand the simplest possible construction should be ensured.
- the stirring element has at least one flow-inducing blade and in that the openings are arranged in the region of the outward flow directed from the inside.
- An essential feature of this invention is that the gas under pressure flows through cavities in these stirring elements to suitable openings arranged on the periphery and is dispersed here in the form of bubbles. It is crucial that the formation of the bubbles at these openings, which can preferably be designed as circular bores or as narrow slits, takes place under the effect of the liquid flowing out from the agitator - that is, from the inside to the outside -, causing smaller bubbles than in the case of Bubbles form in still liquid.
- these openings are arranged in the agitator in such a way that the bubbles formed are transported away from the agitator with the outward flow directed from the inside and then in a large area in the gas to be fumigated Volume of liquid to be distributed.
- the openings must be arranged outside the blades additionally provided according to the invention, ie stirrer blades or stirrer blades. This arrangement avoids, according to the invention, that the bubbles formed can get into the vacuum region behind the leaves and lead there to the undesirable gas cushions, particularly in the case of highly viscous media.
- the direct removal of the bubbles formed away from the stirrer avoids that - as with conventional gassing - the stirrer is flushed with gas at high gas throughputs to such an extent that the stirrer is flooded.
- the risk of flooding occurs, if at all, only with significantly higher gas throughputs than with conventional gassing, since only a part of the total dispersed gas reaches the vicinity of the agitator with the circulating or suction flow and therefore less gas gets into the Can accumulate negative pressure areas behind the blades of the agitator.
- the gas can be introduced into the liquid on the one hand by forced gassing and on the other hand by self-gassing with the gassing stirrer according to the invention.
- the flooding point is shifted to higher gas throughputs at the same speed of rotation of the stirrer, ie significantly more gas can be dispersed in the reactor volume than in conventional, for example radially acting, stirring elements.
- the fact that the bubbles are generated under the action of the radial or tangential shear field of the liquid flowing out of the agitator creates bubbles which are both smaller and less widely varying in diameter.
- volumetric transport coefficient k 1 ⁇ a which is a measure of the intensity of the mass transfer
- k 1 ⁇ a is a measure of the intensity of the mass transfer
- the gas outlet openings are provided on the outside in a circular disk at the top and / or bottom in the required size (for example the diameter of the bore).
- the gas is passed through the hollow shaft and through suitable cavities in this disk to these openings.
- the disc can be equipped on the top and / or bottom with straight or curved blades pointing in the radial direction.
- This agitator is similar to a Rushton turbine.
- the blades must not reach the radius of the circular disks on which the openings (bores or slots) are located.
- the shear effect of the inside-out boundary layer flow between the blades, both of the circulation flow generated from above and below by the stirring element, is optimally used to produce small bubbles and thus to create larger interfaces between gas and liquid.
- the end face of the disk is additionally provided with bores in order to be able to disperse even more gas if necessary.
- These bubbles, which are formed on the end face, are also subject to a shear effect, which is exerted here by the tangential shear field between the rotating stirring element and the liquid set in rotation.
- the gassing stirrer has the advantage that only one hollow shaft is required. If necessary, several gassing devices of the type described can be attached to this hollow shaft if this is necessary, for example, in slim stirred reactors to maintain a uniform and well-mixed volume of liquid.
- FIG. 1 and 2 show a first embodiment of the invention Gassing stirrer 10.
- a stirrer 14 connects centrally to a hollow shaft 12 shown here in section.
- the stirring element 14 consists essentially of a disk with a corresponding cavity 16 which is connected to the hollow shaft 12.
- 8 blades 22 are arranged radially in a star shape, wherein, as can be seen in FIG. 2, the blades 22 are arranged on both sides of the disk in these embodiments.
- corresponding openings 18, here designed as bores are arranged on the top and bottom of the disk, through which the gas flowing into the hollow shaft along the arrow direction according to FIG. 2 and flowing through the hollow disk is indicated to the liquid .
- the blades 22 do not protrude into the outer radius of the disk 14, in which the openings 18 are arranged. This ensures that the fluid flow displaced by the blades 22 and flowing radially outward along the disk shears off the bubbles directly at the openings 18 and transports them to the outside in the outflow direction.
- openings 20 are also provided on the outer edge of the hollow disk. There, the bubbles are sheared off due to the tangential flow component of the fluid flow flowing around the stirring element 14.
- FIG. 3 A variation of the stirring element discussed above is shown in FIG. 3. This differs essentially in that instead of the just aligned blades 22 it has curved blades 22, as can be seen in FIG. 3.
- the stirring element shapes shown here are only advantageous Refinements within the scope of the inventive concept.
- Another configuration can consist, for example, of that, similarly to the hollow stirrer, corresponding short tube sections extending radially from the hollow shaft are arranged, on which corresponding blades are welded vertically standing or also beveled in the inner region, beyond which the ends of the short tube sections extend.
- the vertical positions of the blades are a blade stirrer modified according to this invention.
- it is an inclined blade stirrer modified according to the invention.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
Description
Die Erfindung betrifft einen Begasungsrührer mit einer drehbaren Hohlwelle und mindestens einem daran angeordneten hohlen Rührorgan, wobei dessen Hohlraum mit der Hohlwelle in Verbindung steht und zur zu begasenden Flüssigkeit hin Öffnungen aufweist.The invention relates to a gassing stirrer with a rotatable hollow shaft and at least one hollow stirring element arranged thereon, the hollow space of which is connected to the hollow shaft and has openings towards the liquid to be gassed.
Derartige Rührer sind im allgemeinen bereits als Hohlrührer bekannt. Die Rührorgane derartiger Hohlrührer sind als Rohrrührer bzw. Dreikantrührer ausgeführt (vgl. F. Kneule, Rühren, Praxis der Verfahrenstechnik, Band 1, Deutsche Gesellschaft für technisches Apparatewesen, Frankfurt/Main, 1986, S. 76, 77). Rohrrührer bestehen aus radial von der drehbaren Hohlwelle abstehenden hohlen Rohrstücken, während der Dreikantrührer aus einer hohlen Dreieckscheibe besteht, an deren Ecken entsprechende Öffnungen zum Austritt des Gases vorgesehen sind. Diese Hohlrührer sind selbstbegasende Rührorgane, d.h. daß sie infolge der durch die Rührerrotation entstehende Sogwirkung aus dem Raum über der Flüssigkeit Gas ansaugen und in der Flüssigkeit verteilen. Sie werden insbesondere in niedrigviskosen Flüssigkeiten für den Fall eingesetzt, daß der von ihnen bewirkte Gasdurchsatz für eine gewünschte Reaktion ausreicht. Zum anderen setzt die Begasung erst bei Überschreiten einer Mindestdrehzahl ein. Diese ist dann erreicht, wenn der in den Rühreröffnungen sich aufgrund der Rotationsgeschwindigkeit des Rührers einstellende Geschwindigkeitsdruck den hydrostatischen Druck überwindet. Die Effizienz der Selbstbegasung nach dieser vorbekannten Methode wird im wesentlichen einerseits durch den steigenden hydrostatischen Druck (Füllhöhe) und andererseits durch steigende Viskosität der Flüssigkeit beeinträchtigt. Hierdurch bedingt lassen sich derartige Begasungsrührer im allgemeinen beispielsweise in Fermentern nicht einsetzen.Such stirrers are generally already known as hollow stirrers. The stirring elements of such hollow stirrers are designed as tubular stirrers or three-way stirrers (see F. Kneule, Stirring, Practice of Process Engineering, Volume 1, German Society for Technical Appliances, Frankfurt / Main, 1986, pp. 76, 77). Pipe stirrers consist of hollow tubular pieces protruding radially from the rotatable hollow shaft, while the three-stirrer consists of a hollow triangular disk, at the corners of which corresponding openings are provided for the gas to exit. These hollow stirrers are self-gassing stirrers, ie they suck gas from the space above the liquid and distribute it in the liquid due to the suction effect created by the stirrer rotation. They are used in particular in low-viscosity liquids in the event that the gas throughput caused by them is sufficient for a desired reaction. On the other hand, fumigation only starts when a minimum speed is exceeded. This is achieved when the speed pressure established in the stirrer openings due to the rotational speed of the stirrer overcomes the hydrostatic pressure. The efficiency of self-gassing according to this previously known method is essentially impaired on the one hand by the increasing hydrostatic pressure (filling level) and on the other hand by the increasing viscosity of the liquid. As a result, such gassing stirrers cannot generally be used, for example, in fermenters.
Eine weitere Möglichkeit der Selbstbegasung besteht darin, die Drehzahl eines konventionellen Rührorgans soweit zu erhöhen, daß sich von der Oberfläche des zu rührenden Fluids bis zum Rührorgang eine Trombe ausbildet. Eine derartige sogenannte Trombenbegasung scheidet jedoch in zahlreichen Anwendungsfällen aus verfahrenstechnischen Gründen aus. Darüber hinaus ist diese bei Einsatz von hochviskosen Flüssigkeiten auch nicht realisierbar.Another possibility of self-gassing is to increase the speed of a conventional stirring device to such an extent that a drum forms from the surface of the fluid to be stirred up to the stirring process. Such a so-called gassing of fumes, however, is ruled out in numerous applications for procedural reasons. In addition, this cannot be achieved when using highly viscous liquids.
Im Vergleich zur Selbstbegasung lassen sich größere Gasmengen nach dem Prinzip der Zwangsbegasung dispergieren. Bei der Zwangsbegasung wird dem Rührorgan fremdverdichtetes Gas insbesondere von unten her mit Hilfe statischer Gasverteiler zugeführt. Als statische Gasverteiler werden üblicherweise einfache, nach oben offene Rohre, Ein- bzw. Mehrringbrausen oder auch poröse Platten eingesetzt. Das auf diese Weise zugeführte Gas wird hauptsächlich mit radial wirkenden Rührorganen dispergiert. Das Gas gelangt dabei zu einem Großteil in die Sogströmung des Rührorgans und wird insbesondere in der von den Rührerblättern oder Rührerarmen erzeugten turbulenten Nachlaufströmung (Wirbelschleppen) zerteilt.In comparison to self-gassing, larger amounts of gas can be dispersed using the principle of forced gassing. In the case of forced gassing, externally compressed gas is fed to the agitator, in particular from below, using static gas distributors. Simple, upwardly open pipes, single or multi-ring showers or even porous plates are usually used as static gas distributors. The gas supplied in this way is mainly dispersed with radially acting stirring elements. A large part of the gas enters the suction flow of the agitator and is broken up in particular in the turbulent wake flow generated by the agitator blades or agitator arms (vortices).
Bei der Zwangsbegasung läßt sich im Unterschied zur Selbstbegasung der Gasdurchsatz unabhängig von der Rührleistung bzw. der Rührerdrehzahl variieren. Zum anderen kann mittels Zwangsbegasung Gas auch bei höherer Flüssigkeitsviskosität dispergiert werden. Nachteilig wirkt sich jedoch bei der bekannten Zwangsbegasung mittels Lanzen oder Ein- bzw. Mehrringbrausen das sich in niedrigviskosen Flüssigkeiten bildende breite Blasenspektrum aus. Das bedeutet, daß die erzeugten Gasblasen sehr unterschiedliche Durchmesser aufweisen. So bilden sich im Nachlaufgebiet der Rührerblätter Großblasen, die sehr schnell aus der Flüssigkeit entweichen und damit nur einen geringeren Beitrag zu einem unter Umständen gewünschten Stoffaustausch zwischen Gas und Flüssigkeit liefern. Der in höherviskosen Flüssigkeiten entstehende Feinblasenanteil ist andererseits aufgrund seiner sehr hohen Verweilzeiten häufig sehr schnell von der Wertstoffkomponente, die übertragen werden soll, entreichert, so daß er für den Rest der Verweilzeit nur ein nicht nutzbares Totvolumen darstellt. Ein weiterer Nachteil dieses Standes der Technik besteht darin, daß der zugeführte Gasvolumenstrom bei gegebener Drehzahl der Rührorgane durch den sogenannten Überflutungspunkt des Rührorgans begrenzt ist. Bei dem Betriebszustand der Überflutung wird das Rührorgan praktisch vollständig vom Gas umspült. Eine Steigerung des Gasdurchsatzes über diesen Überflutungspunkt hinaus führt zur Abnahme der spezifischen Grenzfläche zwischen dem Gas und der Flüssigkeit und zu einem insgesamt ungünstigen und ungenügenden Strömungszustand im Rührbehälter, so daß der Stoffübergang negativ beeinträchtigt wird. Dadurch ist der Betriebsbereich der üblichen Begasungsrührer durch den Überflutungspunkt begrenzt.In the case of forced gassing, in contrast to self-gassing, the gas throughput can be independent of the stirring power or Stirrer speed vary. On the other hand, gas can be dispersed by means of forced gassing even with a higher liquid viscosity. However, the broad spectrum of bubbles forming in low-viscosity liquids has a disadvantage in the case of the known forced gassing by means of lances or single or multi-ring showers. This means that the gas bubbles generated have very different diameters. Large bubbles form in the trailing area of the agitator blades, which escape very quickly from the liquid and thus make only a minor contribution to the desired exchange of gas and liquid. On the other hand, due to its very long residence times, the proportion of fine bubbles formed in higher-viscosity liquids is often very quickly removed from the valuable substance component that is to be transferred, so that it represents only an unusable dead volume for the rest of the residence time. Another disadvantage of this prior art is that the gas volume flow supplied is limited by the so-called flooding point of the stirring element at a given speed of the stirring elements. In the operating state of the flooding, the stirring element is practically completely flushed by the gas. An increase in the gas throughput beyond this flood point leads to a decrease in the specific interface between the gas and the liquid and to an overall unfavorable and insufficient flow state in the stirred tank, so that the mass transfer is adversely affected. As a result, the operating range of conventional gassing stirrers is limited by the flood point.
Insbesondere zur Verbesserung der Zwangsbegasung hochviskoser Flüssigkeiten wurde in neuerer Zeit ein Begasungssystem entwickelt, bei dem die Gasdispergierung und die Flüssigkeitsumwälzung von unterschiedlichen Organen übernommen wurde (F. Kneule, a.a.O. S. 79-81). Bei diesem System wird das Gas durch eine Hohlwelle einem rotierenden Düsenkranz zugeführt, wobei radial an diesem angeordnete Kapillaren dafür sorgen, daß im Flüssigkeitsscherfeld Blasen mit einheitlichen Größenspektrum erzeugt werden. Für die Umwälzung und Verteilung dieser Blasen im Reaktorvolumen sorgen konventionelle Rührorgane, die auf einer zweiten Welle montiert sind. Der wesentliche Nachteil dieser Anordnung liegt in dem aufwendigen Aufbau, da hier zwei konzentrisch gelagerte Wellen benötigt werden, die in der Regel mit zwei verschiedenen Drehzahlen angetrieben werden.In particular to improve the forced gassing of highly viscous liquids, a gassing system has recently been developed in which the gas dispersion and the liquid circulation have been carried out by different organs (F. Kneule, op. Cit. Pp. 79-81). In this system, the gas is fed through a hollow shaft to a rotating nozzle ring, with radial on this arranged capillaries ensure that bubbles with a uniform size spectrum are generated in the liquid shear field. Conventional stirring elements mounted on a second shaft ensure that these bubbles are circulated and distributed in the reactor volume. The main disadvantage of this arrangement is the complex structure, since two concentrically mounted shafts are required, which are usually driven at two different speeds.
Aufgabe der vorliegenden Erfindung ist es, einen Begasungsrrnhrer der eingangs angegebenen Art an die Hand zu geben, mit dem einerseits die Effektivität der Begasung von Flüssigkeiten und damit eine Verbesserung des Stoffaustausches erreicht wird, wobei andererseits ein möglichst einfacher konstruktiver Aufbau gewährleistet sein soll.The object of the present invention is to provide a gassing stirrer of the type mentioned at the beginning, with which the effectiveness of the gassing of liquids and thus an improvement in the exchange of substances is achieved, while on the other hand the simplest possible construction should be ensured.
Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das Rührorgan mindestens ein eine Strömung induzierendes Blatt aufweist und daß die Öffnungen im Bereich der von innen nach außen gerichteten Ablaufströmung angeordnet sind. Ein wesentliches Merkmal dieser Erfindung besteht darin, daß das unter Überdruck stehende Gas durch Hohlräume in diesen Rührorganen bis zu geeigneten, an der Peripherie angeordneten Öffnungen strömt und hier in Form von Blasen dispergiert wird. Entscheidend ist es, daß sich die Bildung der Blasen an diesen Öffnungen, die bevorzugt als kreisrunde Bohrungen oder als enge Schlitze ausgebildet sein können, unter der Wirkung der vom Rührorgan - also von innen nach außen - abströmenden Flüssigkeit vollzieht, wodurch kleinere Blasen als bei der Blasenbildung in ruhender Flüssigkeit entstehen. Von wesentlicher Bedeutung ist es ferner, daß diese Öffnungen beim Rührorgan so angeordnet sind, daß die gebildeten Blasen mit der von innen nach außen gerichteten Ablaufströmung vom Rührorgan wegtransportiert und dann großräumig in dem zu begasenden Flüssigkeitsvolumen verteilt werden. Um dies zu gewährleisten, müssen die Öffnungen außerhalb der erfindungsgemäß zusätzlich vorgesehenen Blätter, d.h. Rührerblätter oder Rührerschaufeln, angeordnet sein. Durch diese Anordnung wird erfindungsgemäß vermieden, daß die gebildeten Blasen in das Unterdruckgebiet hinter den Blättern gelangen können und dort, insbesondere bei hochviskosen Medien, zu den unerwünschten Gaspolstern führen. Durch den unmittelbaren Abtransport der gebildeten Blasen vom Rührer weg, wird vermieden, daß - wie bei der konventionellen Begasung - das Rührorgan bei hohen Gasdurchsätzen soweit mit Gas umspült wird, daß es zur Überflutung des Rührorgans kommt. Die Gefahr der Überflutung tritt, wenn überhaupt, erst bei wesentlich größeren Gasdurchsätzen als bei konventioneller Begasung auf, da nur noch ein Teil des insgesamt dispergierten Gases mit der Umlauf- bzw. Ansaugströmung in die Nähe des Rührorgans gelangt und sich damit entsprechend weniger Gas in den Unterdruckgebieten hinter den Blättern des Rührorgans ansammeln kann.According to the invention, this object is achieved in that the stirring element has at least one flow-inducing blade and in that the openings are arranged in the region of the outward flow directed from the inside. An essential feature of this invention is that the gas under pressure flows through cavities in these stirring elements to suitable openings arranged on the periphery and is dispersed here in the form of bubbles. It is crucial that the formation of the bubbles at these openings, which can preferably be designed as circular bores or as narrow slits, takes place under the effect of the liquid flowing out from the agitator - that is, from the inside to the outside -, causing smaller bubbles than in the case of Bubbles form in still liquid. It is also essential that these openings are arranged in the agitator in such a way that the bubbles formed are transported away from the agitator with the outward flow directed from the inside and then in a large area in the gas to be fumigated Volume of liquid to be distributed. In order to ensure this, the openings must be arranged outside the blades additionally provided according to the invention, ie stirrer blades or stirrer blades. This arrangement avoids, according to the invention, that the bubbles formed can get into the vacuum region behind the leaves and lead there to the undesirable gas cushions, particularly in the case of highly viscous media. The direct removal of the bubbles formed away from the stirrer avoids that - as with conventional gassing - the stirrer is flushed with gas at high gas throughputs to such an extent that the stirrer is flooded. The risk of flooding occurs, if at all, only with significantly higher gas throughputs than with conventional gassing, since only a part of the total dispersed gas reaches the vicinity of the agitator with the circulating or suction flow and therefore less gas gets into the Can accumulate negative pressure areas behind the blades of the agitator.
Das Gas kann einerseits durch Zwangsbegasung und andererseits auch durch Selbstbegasung mit dem erfindungsgemäßen Begasungsrührer in die Flüssigkeit eingebracht werden.The gas can be introduced into the liquid on the one hand by forced gassing and on the other hand by self-gassing with the gassing stirrer according to the invention.
Mittels des erfindungsgemäßen Begasungsrührers wird also der Überflutungspunkt bei gleicher Drehzahl des Rührers zu höheren Gasdurchsätzen verschoben, d.h., es kann wesentlich mehr Gas im Reaktorvolumen dispergiert werden als bei konventionellen, beispielsweise radial wirkenden, Rührorganen. Dadurch, daß die Blasen unter der Wirkung des radialen bzw. tangentialen Scherfeldes der vom Rührorgan abströmenden Flüssigkeit erzeugt werden, entstehen sowohl kleinere als auch im Durchmesser weniger stark variierende Blasen. Infolge der hierdurch vergrößerten spezifischen Grenzfläche ergibt sich eine erhebliche Steigerung des Stoffaustausches zwischen der dispers verteilten Gasphase und der Flüssigkeit. Eine deutliche Verbesserung des sogenannten volumetrischen Transportkoeffizienten k₁ · a, der ein Maß für die Intensität des Stoffübergangs darstellt, läßt sich mit der neuen Methode im Vergleich zu den konventionellen Begasungsverfahren insbesondere bei höherviskosen newtonschen und nicht zuletzt höherviskosen strukturviskosen, nicht-newtonschen Flüssigkeiten erzielen. Dies gelingt ebenso für die Begasung nicht koaliszierender Flüssigkeiten, in denen die mit dem neuen Verfahren erzeugten kleineren Primärblasen im wesentlichen stabil dispergiert bleiben und dann für den Stoffaustausch eine entsprechend große Austauschfläche zur Verfügung steht.By means of the gassing stirrer according to the invention, the flooding point is shifted to higher gas throughputs at the same speed of rotation of the stirrer, ie significantly more gas can be dispersed in the reactor volume than in conventional, for example radially acting, stirring elements. The fact that the bubbles are generated under the action of the radial or tangential shear field of the liquid flowing out of the agitator creates bubbles which are both smaller and less widely varying in diameter. As a result of the specific interface that is enlarged as a result, there is a considerable increase in the mass exchange between the dispersed gas phase and the liquid. A significant improvement in the so-called volumetric transport coefficient k 1 · a, which is a measure of the intensity of the mass transfer, can be achieved with the new method compared to the conventional gassing process, particularly in the case of more viscous Newtonian and, not least, more viscous, structurally viscous, non-Newtonian liquids. This also works for the fumigation of non-coalescing liquids, in which the smaller primary bubbles produced with the new process remain essentially stable and then a correspondingly large exchange surface is available for the mass transfer.
Gemäß einer zweckmäßigen Ausführungsform werden die Gasaustrittsöffnungen außenliegend in einer kreisrunden Scheibe oben und/oder unten in der erforderlichen Größe (z.B. Durchmesser der Bohrung) angebracht. Das Gas wird durch die Hohlwelle und durch geeignete Hohlräume in dieser Scheibe zu diesen Öffnungen geleitet. Die Scheibe kann an der Oberseite und/oder Unterseite mit in radialer Richtung zeigenden geraden oder gekrümmten Blättern bestückt sein. Damit ähnelt dieses Rührorgan einer Rushton-Turbine. Jedoch dürfen bei dem erfindungsgemäßen Begasungsrührer die Blätter nicht bis zum Radius der kreisrunden Scheiben heranreichen, auf dem sich die Öffnungen (Bohrungen oder Schlitze) befinden. Aufgrund dieser Anordnung der Bohrungen wird die Scherwirkung der von innen nach außen gerichteten Grenzschichtströmung zwischen den Blättern sowohl der von oben als auch von unten vom Rührorgan erzeugten Umlaufströmung optimal zur Erzeugung kleiner Blasen und damit zur Schaffung größerer Grenzflächen zwischen Gas und Flüssigkeit ausgenutzt. Darüber hinaus wird gemäß einer weiteren Ausgestaltung der Erfindung auch die Stirnseite der Scheibe zusätzlich mit Bohrungen versehen, um erforderlichenfalls noch mehr Gas dispergieren zu können. Auch diese, an der Stirnfläche gebildeten Blasen, unterliegen einer Scherwirkung, die hierbei durch das tangentiale Scherfeld zwischen dem rotierenden Rührorgan und der in Rotation versetzten Flüssigkeit ausgeübt wird.According to an expedient embodiment, the gas outlet openings are provided on the outside in a circular disk at the top and / or bottom in the required size (for example the diameter of the bore). The gas is passed through the hollow shaft and through suitable cavities in this disk to these openings. The disc can be equipped on the top and / or bottom with straight or curved blades pointing in the radial direction. This agitator is similar to a Rushton turbine. However, in the gassing stirrer according to the invention, the blades must not reach the radius of the circular disks on which the openings (bores or slots) are located. Because of this arrangement of the bores, the shear effect of the inside-out boundary layer flow between the blades, both of the circulation flow generated from above and below by the stirring element, is optimally used to produce small bubbles and thus to create larger interfaces between gas and liquid. In addition, according to a further embodiment of the invention, the end face of the disk is additionally provided with bores in order to be able to disperse even more gas if necessary. These bubbles, which are formed on the end face, are also subject to a shear effect, which is exerted here by the tangential shear field between the rotating stirring element and the liquid set in rotation.
In konstruktiver Hinsicht weist der Begasungsrührer den Vorteil auf, daß nur eine Hohlwelle benötigt wird. An dieser Hohlwelle können nach Bedarf mehrere Begasungsorgane der beschriebenen Art angebracht werden, wenn dies zum Beispiel in schlanken Rührreaktoren zur Aufrechterhaltung eines gleichmäßig und gut durchmischten Flüssigkeitsvolumens notwendig ist.In terms of design, the gassing stirrer has the advantage that only one hollow shaft is required. If necessary, several gassing devices of the type described can be attached to this hollow shaft if this is necessary, for example, in slim stirred reactors to maintain a uniform and well-mixed volume of liquid.
Von Vorteil ist es ferner, daß die geometrische Form von bislang bekannten und üblichen Begasungsrührern im wesentlichen beibehalten werden kann, und insofern bewährte Gestaltungselemente bei der konstruktiven Ausführung der neuen Begasungssysteme übernommen werden.It is also advantageous that the geometric shape of previously known and customary gassing stirrers can essentially be retained, and in this respect proven design elements can be adopted in the design of the new gassing systems.
Weitere Einzelheiten und Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Diskussion der anhand der Figuren 1-3 erläuterten Ausführungsbeispiele. Es zeigen:
- Fig. 1:
- eine perspektivische Ansicht eines teilweise dargestellten Begasungsrührers gemäß einer ersten Ausführungsform der vorliegenden Erfindung;
- Fig. 2:
- einen Schnitt durch den Begasungsrührer gemäß der in Fig. 1 dargestellten Ausführungsform und
- Fig. 3:
- eine perspektivische Ansicht einer weiteren Ausführungsform des erfindungsgemäßen Begasungsrührers.
- Fig. 1:
- a perspective view of a gas stirrer partially shown according to a first embodiment of the present invention;
- Fig. 2:
- a section through the gassing stirrer according to the embodiment shown in Fig. 1 and
- Fig. 3:
- a perspective view of another embodiment of the gassing stirrer according to the invention.
Die Figuren 1 und 2 zeigen eine erste Ausführungform des erfindungsgemäßen Begasungsrührers 10. An eine hier geschnitten dargestellte Hohlwelle 12 schließt zentrisch ein Rührorgan 14 an. Das Rührorgan 14 besteht im wesentlichen aus einer Scheibe mit einem entsprechenden Hohlraum 16, welcher mit der Hohlwelle 12 in Verbindung steht. Auf der Scheibe sind 8 Blätter 22 sternförmig radial angeordnet, wobei, wie der Fig. 2 zu entnehmen ist, die Blätter 22 in diesen Ausführungsformen auf beiden Seiten der Scheibe angeordnet sind. Am äußeren Radius der kreisförmigen Hohlscheibe 14 sind an der Ober- und Unterseite der Scheibe entsprechende hier als Bohrungen ausgeführte Öffnungen 18 angeordnet, durch die das in der Hohlwelle entlang der Pfeilrichtung gemäß Fig. 2 einströmende und durch die Hohlscheibe weiterströmende Gas an die Flüssigkeit angegeben wird.Figures 1 and 2 show a first embodiment of the
Wichtig ist es, daß die Blätter 22 nicht in den äußeren Radius der Scheibe 14, in welchem die Öffnungen 18 angeordnet sind, hineinragt. Hierdurch ist gewährleistet, daß die durch die Blätter 22 verdrängte und radial entlang der Scheibe nach außen strömende Fluidströmung die Blasen unmittelbar an den Öffnungen 18 abschert und in Abströmrichtung mit nach außen transportiert.It is important that the
Gemäß der hier diskutierten Ausführungsform sind auch am äußeren Rand der Hohlscheibe Öffnungen 20 vorgesehen. Dort erfolgt ein Abscheren der Blasen aufgrund der Tangentialströmungskomponente der das Rührorgan 14 umströmenden Fluidströmung.According to the embodiment discussed here,
Eine Variation des zuvor diskutieren Rührorgans ist in Fig. 3 dargestellt. Dieses unterscheidet sich im wesentlichen dadurch, daß es anstatt der gerade ausgerichteten Blätter 22 in sich gekrümmte Blätter 22, wie sie der Fig. 3 zu entnehmen sind, aufweist.A variation of the stirring element discussed above is shown in FIG. 3. This differs essentially in that instead of the just aligned
Die hier dargestellten Rührorganformen bilden nur vorteilhafte Ausgestaltungen im Rahmen des Erfindungsgedankens. Eine andere Ausgestaltung kann beispielsweise darin bestehen,
daß ähnlich dem Hohlrührer entsprechende strahlenförmig von der Hohlwelle abgehende Kurzrohrstücke angeordnet sind, auf denen im inneren Bereich entsprechende Blätter senkrecht stehend oder auch angeschrägt angeschweißt sind, über welche die Enden der kurzen Rohrstücke hinausreichen. Bei Senkrechtstellen der Blätter handelt es sich um einen gemäß dieser Erfindung abgewandelten Blattrührer. Bei schräg angestellten Blättern handelt es sich um einen gemäß der Erfindung abgewandelten Schrägblattrührer.The stirring element shapes shown here are only advantageous Refinements within the scope of the inventive concept. Another configuration can consist, for example, of
that, similarly to the hollow stirrer, corresponding short tube sections extending radially from the hollow shaft are arranged, on which corresponding blades are welded vertically standing or also beveled in the inner region, beyond which the ends of the short tube sections extend. The vertical positions of the blades are a blade stirrer modified according to this invention. In the case of inclined blades, it is an inclined blade stirrer modified according to the invention.
Claims (7)
dadurch gekennzeichnet,
daß das Rührorgan (14) mindestens ein eine Strömung induzierendes Blatt (22) aufweist und daß die Öffnungen (18; 20) im Bereich der von innen nach außen gerichteten Ablaufströmung angeordnet sind.Aeration stirrer with a rotatable hollow shaft and at least one hollow stirrer arranged thereon, the hollow space of which is connected to the hollow shaft and has openings towards the liquid to be gassed,
characterized,
that the stirring element (14) has at least one flow-inducing blade (22) and that the openings (18; 20) are arranged in the region of the outward flow directed from the inside.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE9106768U DE9106768U1 (en) | 1991-06-03 | 1991-06-03 | Gassing stirrer |
DE9106768U | 1991-06-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0516921A1 true EP0516921A1 (en) | 1992-12-09 |
EP0516921B1 EP0516921B1 (en) | 1995-06-14 |
Family
ID=6867886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92102519A Expired - Lifetime EP0516921B1 (en) | 1991-06-03 | 1992-02-14 | Gasing stirrer |
Country Status (4)
Country | Link |
---|---|
US (1) | US5318360A (en) |
EP (1) | EP0516921B1 (en) |
AT (1) | ATE123664T1 (en) |
DE (2) | DE9106768U1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9316251U1 (en) * | 1993-10-25 | 1994-02-10 | Charatjan, Manuela, 76332 Bad Herrenalb | Device for stirring or for stirring and simultaneously gassing liquids, suspensions and heterogeneous fluids |
EP0754489A1 (en) * | 1995-07-20 | 1997-01-22 | Air Products And Chemicals, Inc. | Method and apparatus to improve gas dispersion and gas mass transfer in a stirred tank reactor |
CN107926732A (en) * | 2017-10-31 | 2018-04-20 | 贵港市瑞成科技有限公司 | A kind of swill bucket |
Families Citing this family (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH686874A5 (en) * | 1992-01-31 | 1996-07-31 | V Zug Ag | Device for introducing a gas into a liquid. |
GB9213513D0 (en) * | 1992-06-25 | 1992-08-12 | Thames Water Utilities | A nozzle |
US5511881A (en) * | 1995-01-06 | 1996-04-30 | General Signal Corporation | Impeller system and method for enhanced-flow pumping of liquids |
US5925293A (en) | 1996-10-04 | 1999-07-20 | General Signal Corporation | Mixer sparging apparatus |
US5944496A (en) | 1996-12-03 | 1999-08-31 | Cooper; Paul V. | Molten metal pump with a flexible coupling and cement-free metal-transfer conduit connection |
US5951243A (en) | 1997-07-03 | 1999-09-14 | Cooper; Paul V. | Rotor bearing system for molten metal pumps |
AUPO881797A0 (en) * | 1997-08-20 | 1997-09-18 | Lewis, Michael Anthony | The twin vortex aerator and safety mixer |
US6093000A (en) | 1998-08-11 | 2000-07-25 | Cooper; Paul V | Molten metal pump with monolithic rotor |
US6280079B1 (en) * | 1998-12-24 | 2001-08-28 | United Microelectronics Corp. | Method of mixing slurries |
US6303074B1 (en) | 1999-05-14 | 2001-10-16 | Paul V. Cooper | Mixed flow rotor for molten metal pumping device |
US6318705B1 (en) | 2000-01-14 | 2001-11-20 | Jet, Inc. | Aspirator |
US6689310B1 (en) | 2000-05-12 | 2004-02-10 | Paul V. Cooper | Molten metal degassing device and impellers therefor |
US6723276B1 (en) | 2000-08-28 | 2004-04-20 | Paul V. Cooper | Scrap melter and impeller |
AT5698U1 (en) * | 2001-11-23 | 2002-10-25 | Hermann Boeck | DEVICE AND METHOD FOR MIXING LIQUID, TEMPERATURE AND / OR GIANT MEDIA |
FR2834652B1 (en) * | 2002-01-11 | 2004-02-27 | Atofina | AGITATION DEVICE IN PARTICULAR FOR THE DISPERSION OR EMULSIFICATION OF TWO NON-MISCIBLE LIQUIDS |
US7470392B2 (en) | 2003-07-14 | 2008-12-30 | Cooper Paul V | Molten metal pump components |
US20070253807A1 (en) | 2006-04-28 | 2007-11-01 | Cooper Paul V | Gas-transfer foot |
US20050013715A1 (en) | 2003-07-14 | 2005-01-20 | Cooper Paul V. | System for releasing gas into molten metal |
US7731891B2 (en) | 2002-07-12 | 2010-06-08 | Cooper Paul V | Couplings for molten metal devices |
US7402276B2 (en) | 2003-07-14 | 2008-07-22 | Cooper Paul V | Pump with rotating inlet |
US7906068B2 (en) | 2003-07-14 | 2011-03-15 | Cooper Paul V | Support post system for molten metal pump |
DE102004039960A1 (en) * | 2004-08-18 | 2006-02-23 | Bayer Materialscience Ag | Stirring device and method for carrying out a gas-liquid reaction |
CN100340329C (en) * | 2004-10-29 | 2007-10-03 | 中国石油化工股份有限公司 | Self air feeding type gas liquid mixing blade |
JP4824962B2 (en) * | 2005-07-25 | 2011-11-30 | 越後製菓株式会社 | Centrifugal dehydrator |
US8366312B1 (en) * | 2006-08-01 | 2013-02-05 | United Services Automobile Association (Usaa) | Systems to store and agitate fuel |
US8056886B2 (en) * | 2007-01-02 | 2011-11-15 | Jet Inc. | Aspirator |
US20080199321A1 (en) * | 2007-02-16 | 2008-08-21 | Spx Corporation | Parabolic radial flow impeller with tilted or offset blades |
EP2153886A4 (en) * | 2007-05-22 | 2014-09-10 | Toshiba Kk | Device and method for producing micro gas bubbles |
US9409232B2 (en) | 2007-06-21 | 2016-08-09 | Molten Metal Equipment Innovations, Llc | Molten metal transfer vessel and method of construction |
US8337746B2 (en) | 2007-06-21 | 2012-12-25 | Cooper Paul V | Transferring molten metal from one structure to another |
US9410744B2 (en) | 2010-05-12 | 2016-08-09 | Molten Metal Equipment Innovations, Llc | Vessel transfer insert and system |
US8613884B2 (en) | 2007-06-21 | 2013-12-24 | Paul V. Cooper | Launder transfer insert and system |
US9156087B2 (en) | 2007-06-21 | 2015-10-13 | Molten Metal Equipment Innovations, Llc | Molten metal transfer system and rotor |
US9643247B2 (en) | 2007-06-21 | 2017-05-09 | Molten Metal Equipment Innovations, Llc | Molten metal transfer and degassing system |
US8366993B2 (en) | 2007-06-21 | 2013-02-05 | Cooper Paul V | System and method for degassing molten metal |
US9205490B2 (en) | 2007-06-21 | 2015-12-08 | Molten Metal Equipment Innovations, Llc | Transfer well system and method for making same |
CN101444715B (en) * | 2008-11-27 | 2011-07-06 | 华东理工大学 | Self-suction mixing reactor |
US8535603B2 (en) | 2009-08-07 | 2013-09-17 | Paul V. Cooper | Rotary degasser and rotor therefor |
US8444911B2 (en) | 2009-08-07 | 2013-05-21 | Paul V. Cooper | Shaft and post tensioning device |
US10428821B2 (en) | 2009-08-07 | 2019-10-01 | Molten Metal Equipment Innovations, Llc | Quick submergence molten metal pump |
US8449814B2 (en) | 2009-08-07 | 2013-05-28 | Paul V. Cooper | Systems and methods for melting scrap metal |
US8524146B2 (en) | 2009-08-07 | 2013-09-03 | Paul V. Cooper | Rotary degassers and components therefor |
US8714914B2 (en) | 2009-09-08 | 2014-05-06 | Paul V. Cooper | Molten metal pump filter |
US9108244B2 (en) | 2009-09-09 | 2015-08-18 | Paul V. Cooper | Immersion heater for molten metal |
CN102452540B (en) * | 2010-10-15 | 2014-01-01 | 中国石油化工股份有限公司 | Method for treating malodorous waste gas discharged by storage tanks |
CN102451625B (en) * | 2010-10-15 | 2014-01-01 | 中国石油化工股份有限公司 | Self-suction gas-liquid mixing impeller |
CN102451610B (en) * | 2010-10-15 | 2014-01-01 | 中国石油化工股份有限公司 | Treatment method for nitrogen oxide tail gas discharged from industrial production furnace, and apparatus thereof |
CN102580653B (en) * | 2011-12-27 | 2014-06-25 | 杭州海虹精细化工有限公司 | ADC (azodicarbonamide) chlorine oxidation process with self-priming stirring function |
US9903383B2 (en) | 2013-03-13 | 2018-02-27 | Molten Metal Equipment Innovations, Llc | Molten metal rotor with hardened top |
US9011761B2 (en) | 2013-03-14 | 2015-04-21 | Paul V. Cooper | Ladle with transfer conduit |
US10052688B2 (en) | 2013-03-15 | 2018-08-21 | Molten Metal Equipment Innovations, Llc | Transfer pump launder system |
US10138892B2 (en) | 2014-07-02 | 2018-11-27 | Molten Metal Equipment Innovations, Llc | Rotor and rotor shaft for molten metal |
US10947980B2 (en) | 2015-02-02 | 2021-03-16 | Molten Metal Equipment Innovations, Llc | Molten metal rotor with hardened blade tips |
US10267314B2 (en) | 2016-01-13 | 2019-04-23 | Molten Metal Equipment Innovations, Llc | Tensioned support shaft and other molten metal devices |
CN105566622B (en) * | 2016-02-23 | 2017-05-31 | 扬州惠通化工科技股份有限公司 | A kind of fat polymerization reaction system |
JP6169772B1 (en) * | 2016-12-07 | 2017-07-26 | マイクロ波化学株式会社 | Stirring blade and processing device |
US11149747B2 (en) | 2017-11-17 | 2021-10-19 | Molten Metal Equipment Innovations, Llc | Tensioned support post and other molten metal devices |
US11358216B2 (en) | 2019-05-17 | 2022-06-14 | Molten Metal Equipment Innovations, Llc | System for melting solid metal |
CN111252914B (en) * | 2020-01-18 | 2020-11-17 | 海兴县新源化工有限公司 | Phosphorus-free corrosion and scale inhibitor, preparation device and preparation method |
US20220347635A1 (en) * | 2021-04-29 | 2022-11-03 | Metso Outotec Finland Oy | Impeller, a diffuser and an arrangement using such impeller and diffuser in a flotation tank |
US11873845B2 (en) | 2021-05-28 | 2024-01-16 | Molten Metal Equipment Innovations, Llc | Molten metal transfer device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE900087C (en) * | 1951-01-11 | 1953-12-21 | Sinner A G | Rotary ventilator for the finest distribution of air in a liquid |
DE1189952B (en) * | 1959-06-30 | 1965-04-01 | Basf Ag | Device for gassing liquids in a pressure vessel |
DE2005593B2 (en) * | 1970-02-07 | 1971-07-29 | Waste water aerating agitator | |
US3650513A (en) * | 1969-04-04 | 1972-03-21 | Frank D Werner | Aeration device |
DE2544204A1 (en) * | 1975-10-03 | 1977-04-14 | Bayer Ag | Simultaneous stirring and bubbling of gas through liquids - with mechanical stirrers with hollow shafts |
EP0364678A1 (en) * | 1988-09-26 | 1990-04-25 | Dyckerhoff & Widmann Aktiengesellschaft | Process for composting waste in liquid form |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US573473A (en) * | 1896-12-22 | Powder-mixing device | ||
US720513A (en) * | 1901-12-11 | 1903-02-10 | American Butter Separator Company | Churn. |
US1084210A (en) * | 1912-11-19 | 1914-01-13 | Minerals Separation Ltd | Apparatus for agitating and aerating liquids or pulps. |
US1093751A (en) * | 1913-10-24 | 1914-04-21 | Burlington Separator Co | Butter-separator. |
US1413724A (en) * | 1916-07-03 | 1922-04-25 | Groch Frank | Ore concentrator |
US1374446A (en) * | 1918-10-16 | 1921-04-12 | William E Greenawalt | Apparatus for treating liquids with gases |
US1417883A (en) * | 1921-10-03 | 1922-05-30 | Air O Mix Inc | Aerating and mixing device |
US1853067A (en) * | 1930-03-06 | 1932-04-12 | Alfred Charles Hutton | Agitator |
US2031590A (en) * | 1931-10-05 | 1936-02-25 | Arthur C Daman | Flotation apparatus |
US1925777A (en) * | 1932-01-14 | 1933-09-05 | Fred A Carter | Aerating stirrer |
US2288063A (en) * | 1940-10-28 | 1942-06-30 | Jr George W Ashlock | Drink mixing device |
BE525439A (en) * | 1953-03-13 | |||
GB832526A (en) * | 1956-09-27 | 1960-04-13 | Metalurski Inst Pri Tehniski F | Stirrers for flotation cells or agitators |
FR1158406A (en) * | 1956-10-16 | 1958-06-13 | Metalurski Inst Pri Tehniski F | Flotation cell or agitator for flotation and flotation process |
DE1083771B (en) * | 1958-08-08 | 1960-06-23 | Hefefabrik Weingarten G M B H | Device for intensive aeration and gassing of liquids |
DE1244121B (en) * | 1962-05-30 | 1967-07-13 | Escher Wyss Gmbh | Device for intensive gassing of liquids |
GB1206074A (en) * | 1969-03-12 | 1970-09-23 | Kyowa Hakko Kogyo Kk | Agitating apparatus |
US3782702A (en) * | 1969-12-29 | 1974-01-01 | R King | Apparatus for mixing and treating fluids |
DE2006313A1 (en) * | 1970-02-12 | 1971-03-11 | Krupp Gmbh | Device for gassing liquids below the surface |
US3814396A (en) * | 1972-02-16 | 1974-06-04 | Envirotech Corp | Aeration apparatus |
US3917763A (en) * | 1972-09-05 | 1975-11-04 | Werner Frank D | Aerator |
US3984001A (en) * | 1974-03-25 | 1976-10-05 | Mitsui Mining & Smelting Co., Ltd. | Bubble-dispersing apparatus |
US3992491A (en) * | 1975-09-30 | 1976-11-16 | Fmc Corporation | Rotating gas diffuser |
FR2402472A1 (en) * | 1977-09-13 | 1979-04-06 | Alsthom Atlantique | APPARATUS FOR HOLDING SOLID PRODUCTS IN SUSPENSION AND METHOD OF USE |
-
1991
- 1991-06-03 DE DE9106768U patent/DE9106768U1/en not_active Expired - Lifetime
-
1992
- 1992-02-14 DE DE59202500T patent/DE59202500D1/en not_active Expired - Fee Related
- 1992-02-14 EP EP92102519A patent/EP0516921B1/en not_active Expired - Lifetime
- 1992-02-14 AT AT92102519T patent/ATE123664T1/en not_active IP Right Cessation
- 1992-06-02 US US07/892,089 patent/US5318360A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE900087C (en) * | 1951-01-11 | 1953-12-21 | Sinner A G | Rotary ventilator for the finest distribution of air in a liquid |
DE1189952B (en) * | 1959-06-30 | 1965-04-01 | Basf Ag | Device for gassing liquids in a pressure vessel |
US3650513A (en) * | 1969-04-04 | 1972-03-21 | Frank D Werner | Aeration device |
DE2005593B2 (en) * | 1970-02-07 | 1971-07-29 | Waste water aerating agitator | |
DE2544204A1 (en) * | 1975-10-03 | 1977-04-14 | Bayer Ag | Simultaneous stirring and bubbling of gas through liquids - with mechanical stirrers with hollow shafts |
EP0364678A1 (en) * | 1988-09-26 | 1990-04-25 | Dyckerhoff & Widmann Aktiengesellschaft | Process for composting waste in liquid form |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9316251U1 (en) * | 1993-10-25 | 1994-02-10 | Charatjan, Manuela, 76332 Bad Herrenalb | Device for stirring or for stirring and simultaneously gassing liquids, suspensions and heterogeneous fluids |
EP0754489A1 (en) * | 1995-07-20 | 1997-01-22 | Air Products And Chemicals, Inc. | Method and apparatus to improve gas dispersion and gas mass transfer in a stirred tank reactor |
CN107926732A (en) * | 2017-10-31 | 2018-04-20 | 贵港市瑞成科技有限公司 | A kind of swill bucket |
Also Published As
Publication number | Publication date |
---|---|
DE9106768U1 (en) | 1991-07-25 |
DE59202500D1 (en) | 1995-07-20 |
EP0516921B1 (en) | 1995-06-14 |
ATE123664T1 (en) | 1995-06-15 |
US5318360A (en) | 1994-06-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0516921B1 (en) | Gasing stirrer | |
DE68915059T2 (en) | Mixing device. | |
DE69505159T2 (en) | Method and apparatus for mixing a gaseous chemical substance into fiber suspensions | |
EP2613871B1 (en) | Stirrer | |
DE2722826A1 (en) | DEVICE FOR INJECTION OF GAS INTO A LIQUID | |
DE2461032B2 (en) | Device for gassing and circulating e.g. aqueous liquids | |
DE69608694T2 (en) | SUBMERSIBLE MIXER | |
DE2307328A1 (en) | VENTILATION METHOD AND DEVICE | |
DE102008022907A1 (en) | Multi-Component Mixing Apparatus | |
DE2643691C2 (en) | Aeration stirrer | |
DE1542213C3 (en) | Tubular reactor | |
EP0587714B1 (en) | Device for dispersing, suspending or emulsifying gases, liquids and/or free-flowing solid substances | |
DE4220239C2 (en) | Mixing device | |
DE69830064T2 (en) | Improved mixing and ventilation device | |
DE3001829C2 (en) | ||
EP0006597B1 (en) | Process and apparatus for the aeration of water | |
DE2627600C2 (en) | Device for the discontinuous mixing of at least two substances | |
EP3334519B1 (en) | Device and method for dispersing at least one substance in a fluid | |
DE2127338C2 (en) | Device for the continuous mixing or conversion of liquids | |
EP1964604A2 (en) | Method and device for continuous production of a mixture composed of at least two different flow-capable phases | |
EP0201927B1 (en) | Device for mixing and dispersing at least two media | |
DE1964308B2 (en) | Device for gassing and circulating liquids | |
DE2260249C3 (en) | Fermentation vessel with a horizontal longitudinal axis | |
DE2544204A1 (en) | Simultaneous stirring and bubbling of gas through liquids - with mechanical stirrers with hollow shafts | |
DE8234623U1 (en) | STIRRING DEVICE |
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 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19930128 |
|
17Q | First examination report despatched |
Effective date: 19940316 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT Effective date: 19950614 Ref country code: DK Effective date: 19950614 Ref country code: GB Effective date: 19950614 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19950614 Ref country code: BE Effective date: 19950614 |
|
REF | Corresponds to: |
Ref document number: 123664 Country of ref document: AT Date of ref document: 19950615 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 59202500 Country of ref document: DE Date of ref document: 19950720 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950914 |
|
ET | Fr: translation filed | ||
GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 19950614 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19960229 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20050217 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20050218 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 20050221 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 20050222 Year of fee payment: 14 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20050225 Year of fee payment: 14 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060214 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060228 Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060901 Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060901 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20060901 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20061031 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20060228 |