EP1534415B1 - Vorrichtung und verfahren zum kontinuierlichen mischen von komponenten - Google Patents

Vorrichtung und verfahren zum kontinuierlichen mischen von komponenten Download PDF

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Publication number
EP1534415B1
EP1534415B1 EP03733725A EP03733725A EP1534415B1 EP 1534415 B1 EP1534415 B1 EP 1534415B1 EP 03733725 A EP03733725 A EP 03733725A EP 03733725 A EP03733725 A EP 03733725A EP 1534415 B1 EP1534415 B1 EP 1534415B1
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EP
European Patent Office
Prior art keywords
components
mixing chamber
mixing
mass flow
volume
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.)
Expired - Lifetime
Application number
EP03733725A
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English (en)
French (fr)
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EP1534415A1 (de
Inventor
Jan-Olov Forslund
Per Stenson
Johan Sjöholm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Land & Sjo Food Technology AB
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Land & Sjo Food Technology AB
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Publication date
Application filed by Land & Sjo Food Technology AB filed Critical Land & Sjo Food Technology AB
Publication of EP1534415A1 publication Critical patent/EP1534415A1/de
Application granted granted Critical
Publication of EP1534415B1 publication Critical patent/EP1534415B1/de
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • 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
    • B01F23/50—Mixing liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles
    • B01F35/53—Mixing receptacles characterised by the configuration of the interior, e.g. baffles for facilitating the mixing of components

Definitions

  • the present invention generally relates to a device and a method for mixing at least two components and, more specifically, to such a device and such a method for continuously mixing said components.
  • the components When mixing components, such as liquids and/or powders, the components are usually brought together in a container, such as a tank, followed by stirring.
  • a container such as a tank
  • a device is used for continuous feeding of a powder component into a continuous flow of a liquid component.
  • one object of the present invention is to provide a better device and a better method for continuous mixing of components.
  • Another object is that the device and the method should ensure homogeneous mixing of said components.
  • a device for continuous mixing of at least two components, which device is characterised by a mixing chamber for receiving a volume of said components, means for continuously conveying an inflow of said components to the mixing chamber, means for continuously conveying an outflow of a mixture of said components from the mixing chamber and a stirring means, the mixing chamber having a bottom portion which tapers from a polygonal base to a bottom, and the stirring means being adapted to generate, in said volume, a mass flow directed to said bottom.
  • continuous mixing refers to simultaneous supply of said components and discharge of said mixture.
  • the design of the bottom portion in combination with said mass flow produces a flow pattern that promotes homogeneous mixing of the components.
  • the flow pattern in the mixing chamber also prevents forming of turbulence or a vortex, which makes it possible to avoid undesirable introduction of air into the volume.
  • the stirring means is adapted to generate a mass flow which is considerably higher than the inflow and the outflow. This ensures a comparatively high internal turnover of the components in the mixing chamber, which further promotes homogeneous, continuous mixing of the components. In particular, it is possible to ensure homogeneous mixing of an inflow of components even if the inflow comprises a small flow of one of the components and a considerably greater flow of one of the other components.
  • the mass flow is preferably at least ten times greater than said inflow and said outflow.
  • the mixing chamber is defined by a substantially cubic housing, said bottom portion being formed by a corner portion of said housing. This ensures that the entire volume contained in the mixing chamber cannot be set in rotation by the stirring means, which implies that substantially all the force of the stirring means can be focused on the generation of said mass flow.
  • the device is preferably adapted for mixing components of which at least one is a liquid component.
  • the device can be adapted for mixing components of which at least one is a powder component.
  • the bottom portion of the device has a triangular base.
  • the bottom portion of the device has a quadrangular base.
  • the base of the bottom portion tapers towards a bottom in the form of a point.
  • a method for continuous mixing of at least two components comprising the steps of continuously conveying an inflow of said components to a mixing chamber with a bottom portion which tapers from a polygonal base to a bottom, generating a mass flow, directed to said bottom, in a volume which is contained in said mixing chamber and which is formed by the components conveyed to the mixing chamber, and continuously conveying an outflow of a mixture of said components from the mixing chamber.
  • the step of generating a mass flow comprises adjusting of the mass flow so as to make it considerably higher than said inflow and said outflow. This results in an advantageously high internal turnover of the components, which further promotes homogeneous mixing of the components.
  • the mass flow is adjusted so as to be at least ten times greater than said inflow and said outflow.
  • the inventive device will be described for continuous mixing of a liquid component and a powder component. It will be understood, however, that the present invention is not limited to continuous mixing of this combination of components.
  • the invention is also applicable to continuous mixing of more than two components and continuous mixing of, for example, exclusively liquid components.
  • the invention also comprises applications, in which one or more gas components are mixed with one or more liquid components.
  • the base 8 of the bottom portion 7 forms a quadrangle, but according to the present invention the base 8 may also have some other polygonal design.
  • the bottom 9 is in the form of a point 10, but it will be appreciated that the bottom 9 may have another design.
  • the bottom can, for example, constitute the narrow end of a bottom portion in the form of a truncated pyramid.
  • the supply means 4 comprises a supply pipe 11 which is connected to the mixing chamber 3 in an upper portion thereof. It will be understood that the supply means can be arranged for supplying said components in the form of separate partial flows and that the supply means does not necessarily have to be connected to the mixing chamber in the upper portion thereof.
  • the discharge means 5 comprises a discharge pipe 12 which is connected to the bottom portion 7 of the mixing chamber 3. Naturally, the discharge means can also be connected to the mixing chamber in some other position.
  • the stirring means 6 comprises a shaft 13, which is rotatable by means of a driving mechanism (not shown) and which extends vertically towards the point 10 of the bottom portion 7, and an agitator or blade means 14, which is supported by the shaft and which is arranged substantially in the centre of the mixing chamber 3.
  • This blade means can be designed in a number of ways and the blade means 14 shown in Fig. 1 is only a non-limiting example of a convenient design.
  • the supply means 4 is activated. This results in a continuous inflow of the components to the mixing chamber 3 through the supply pipe 11, which will fill the mixing chamber 3 to a given volume consisting of said components.
  • the stirring means 6 is activated, the shaft 13 causing the blade means 14 to rotate.
  • the blade means 14 is adapted to engage the volume of components contained in the mixing chamber 3 to generate a mass flow directed to the bottom 9 of the mixing chamber 3.
  • the stirring means 6 thus generates a mass flow directed to the bottom 9. From there, the mass flow is deflected and forced upwards in the mixing chamber 3. Now the mass flow is divided into partial flows, which substantially follow a corner edge 15 each of the pyramid-shaped bottom portion 7. The different mass flows are then continuously forced upwards in the mixing chamber 3 until they finally sink back down, under the influence of gravity, into the rest of the volume contained in the mixing chamber 3.
  • the mass flow generated in the mixing chamber 3 is preferably so intense that the partial flows are pressed all the way up to the top of the mixing chamber, where they recombine and then sink down in the volume. The components are thus circulated cyclically in the mixing chamber 3, thereby ensuring homogeneous mixing of the components.
  • the supply means 4 and the discharge means 5 can be arranged for intermittent operation. However, in order to provide continuous mixing, they have to be activated for simultaneous continuous supply and discharge, respectively. It goes without saying that exceptions are made for the start when the mixing chamber 3 is to be filled with the components and the terminal phase when the components are to be evacuated from the mixing chamber 3 in mixed condition.
  • the stirring means 6 should be adapted to generate a mass flow that is considerably greater than the inflow of components to the mixing chamber 3 and the outflow of the homogeneous mixture from the mixing chamber 3.
  • the mass flow is at least ten times greater than said inflow and said outflow.
  • the design of the bottom portion 7 contributes to producing a flow pattern in the mixing chamber 3 that is favourable for homogeneous mixing of the supplied components. This in combination with the comparatively high internal turnover of the components in the mixing chamber 3 ensures homogeneous mixing of the components. As already mentioned, the comparatively high internal turnover is achieved by ensuring that the mass flow generated by the stirring means 6 is considerably higher than the inflow of components and the outflow of the homogeneous mixture.
  • the inventive device 1 thus allows continuous mixing of components. Furthermore, the inventive device 1 has a comparatively high degree of efficiency. This again is due to the design of the bottom portion 7. Its quadrangular base 8 imparts a geometric shape to the bottom portion 7 such that the partial volume of the components contained therein cannot be set in rotation when the stirring means 6 engages said partial volume. Provided that the rest of the housing 2 has a suitable design, it will thus be possible to ensure that substantially all the force is focused on the generation of the mass flow when the blade means 14 engages the components.
  • the device 1 comprises a housing 2, which internally defines a mixing chamber 3, supply means 4, discharge means 5 and a stirring means 6.
  • the housing 2 is substantially in the form of a cube placed on its edge, which results in the mixing chamber 3 having a bottom portion 7 formed by a corner edge of the housing 2.
  • the bottom portion 7 thus tapers from a triangular base 8 to a bottom 9 in the form of a point 10.
  • the base 8 is indicated by a dot-dashed line.
  • the supply means 4 comprises a first supply pipe 11a and a second supply pipe 11b, which is concentrically arranged inside the first supply pipe 11a. It will be appreciated, however, that the supply means can be arranged in other positions and be designed differently.
  • the discharge means 5 is arranged in the bottom portion 7 of the mixing chamber 3.
  • the discharge means 5 comprises a discharge pipe 12 which is connected to the bottom portion 7 of the mixing chamber 3.
  • the stirring means 6 comprises a rotatable shaft 13, which extends from the upper portion 16 into the mixing chamber 3, and a blade means 14, which is supported by the shaft 13 and which is arranged substantially in the centre of the mixing chamber 3.
  • the shaft 13 thus extends through a central portion of said upper portion towards the point of the bottom portion.
  • the stirring means 6 also comprises a driving mechanism (not shown) for rotating the shaft 13. It goes without saying that the shaft can also support two or more blade means.
  • the blade means 14 can also be arranged closer to the bottom so that the inventive device can be operated at a lower degree of filling.
  • the discharge means 5 can also comprise connecting pipes and pumps (not shown).
  • the preferred embodiment of the inventive device 1 is intended for mixing of a liquid component and a powder component.
  • the liquid component is added continuously to the mixing chamber 3 through the first supply pipe 11a whereas the powder component is added continuously through the second supply pipe 11b.
  • Fig. 4 illustrates the device 1 described with reference to Figs 2 and 3 in operation.
  • the mass flow P3 is preferably so intense that the partial flows P4 reach the upper portion 16 of the mixing chamber 3, where they recombine and sink back down in the volume V under the influence of gravity.
  • the mass flow P3 generated by the blade means 14 of the stirring means 6 is considerably higher than the inflow P1 of components and the outflow P2 of the mixture, a high internal turnover is obtained which further promotes homogeneous mixing of the components.
  • the mass flow P3 is preferably at least ten times greater than the inflow P1 and the outflow P2.
  • a device 1 is provided for continuous mixing with a high capacity.
  • reliable homogeneous mixing is obtained of an inflow P1 comprising a small flow of one of the components and a great flow of one of the other components.
  • the geometric design of the mixing chamber 3 ensures that the volume V will not be set in rotation when engaged by the blade means 14. More specifically, this is achieved thanks to the fact that the mixing chamber 3 is not rotationally symmetric in the direction of rotation of the blade means 14. Consequently, substantially all the force can be focused on the generation of the mass flow P3, which results in an inventive device with a comparatively high degree of efficiency.
  • the powder component which is supplied to the mixing chamber 3 through the second supply pipe 11b sinks down onto the surface of the volume V and is then drawn down into the volume V owing to the mass flow P3 generated by the blade means 14. Since the blade means 14 does not set the volume V in rotation, it is also ensured that the powder component falling down onto the surface of the volume V is not flung out to the sides of the mixing chamber 3 by the centrifugal force.
  • the geometric design of the mixing chamber 3 thus ensures efficient introduction of the powder component into the volume V.
  • the powder component tends to agglomerate. Such agglomerates will, however, be drawn down into the volume V to the blade means 14 to be disintegrated before they are entrained by the mass flow P3 directed to the bottom 9.
  • the liquid component is supplied through an annular supply pipe 11a which surrounds the supply pipe 11b of the powder component. Owing to this, the powder component is wetted which prevents dust formation.
  • a device 1 which allows continuous mixing of at least two components. More specifically, a continuous inflow P1 of the components is supplied to a mixing chamber 3, from which a corresponding outflow P2 of the components in mixed condition is discharged.
  • the mixing chamber 3 has a bottom portion 7 which tapers from a polygonal base 8 to a bottom 9, a stirring means 6 generating a mass flow P3 which is directed to the bottom 9 and which advantageously is considerably higher than the inflow P1 and the outflow P2 in the mixing chamber.
  • the geometric design of the bottom portion 7 in combination with the comparatively great mass flow P3 ensures homogeneous mixing of the components.
  • the design of the bottom portion also makes it possible to ensure that the volume contained in the mixing chamber is not set in rotation by the stirring means. As a result, the frictional losses in the mixing chamber will be low and substantially all the force can be focused on the generation of the mass flow directed to the bottom, which results in a high degree of efficiency of the device. This reduces the energy transmitted to the volume and thus also a resultant temperature increase in the volume.
  • stirring means does not set the volume in rotation, no conventional turbulence or vortex forms at the surface of the volume. This makes it possible to prevent air from being added to the volume, which may be preferable in some applications.
  • the inventive device also allows reliable continuous and homogeneous mixing of components already at a comparatively low degree of filling of the mixing chamber. Consequently, the volume of components contained in the mixing chamber may have a considerably lower surface level than that shown in Fig. 4 . It should be noted, however, that the flow pattern may be somewhat different if the inventive device operates at a lower filling degree.
  • the inventive device can, for example, be used for mixing a gas component with a liquid component.
  • the device is not apt to let in air into the volume.
  • the gas component has to be introduced into the liquid component under the surface thereof.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Claims (12)

  1. Vorrichtung zum kontinuierlichen Mischen mindestens zweier Komponenten, gekennzeichnet durch
    eine Mischkammer (3) zum Aufnehmen eines Volumens (V) der Komponenten,
    ein Mittel (4) zum kontinuierlichen Transportieren eines Zuflusses (P1) der Komponenten zu der Mischkammer (3),
    ein Mittel (5) zum kontinuierlichen Transportieren eines Abflusses (P2) eines Gemisches der Komponenten aus der Mischkammer (3) und
    ein Rührmittel (6),
    wobei die Mischkammer (3) einen unteren Abschnitt (7) aufweist, der sich von einer polygonalen Basis (8) aus zu einem Boden (9) hin verjüngt, und
    wobei das Rührmittel (6) dafür geeignet ist, in dem Volumen (V) einen Massefluss (P3) zu erzeugen, der auf den Boden (9) gerichtet ist.
  2. Vorrichtung nach Anspruch 1, wobei das Rührmittel so konfiguriert ist, dass der Massefluss (P3) beträchtlich höher ist als der Zufluss (P1) und der Abfluss (P2).
  3. Vorrichtung nach Anspruch 2, wobei das Rührmittel so konfiguriert ist, dass der Massefluss (P3) mindestens zehnmal größer ist als der Zufluss (P1) und der Abfluss (P2).
  4. Vorrichtung nach einem der Ansprüche 1-3, wobei die Mischkammer (3) durch ein im Wesentlichen würfelförmiges Gehäuse (2) definiert wird, wobei der untere Abschnitt (7) durch einen Eckabschnitt des Gehäuses (2) gebildet wird.
  5. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Vorrichtung zum Mischen von Komponenten geeignet ist, von denen mindestens eine eine flüssige Komponente ist.
  6. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Vorrichtung zum Mischen von Komponenten geeignet ist, von denen mindestens eine eine Pulverkomponente ist.
  7. Vorrichtung nach einem der vorangehenden Ansprüche, wobei der untere Abschnitt (7) eine dreieckige Basis (8) aufweist.
  8. Vorrichtung nach einem der Ansprüche 1-6, wobei der untere Abschnitt (7) eine viereckige Basis (8) aufweist.
  9. Vorrichtung nach einem der vorangehenden Ansprüche, wobei die Basis (8) des unteren Abschnitts (7) sich in Richtung des Bodens (9) in Form einer Spitze (10) verjüngt.
  10. Verfahren zum kontinuierlichen Mischen mindestens zweier Komponenten, das folgende Schritte umfasst:
    kontinuierliches Transportieren eines Zuflusses (P1) der Komponenten zu einer Mischkammer (3) mit einem unteren Abschnitt (7), der sich von einer polygonalen Basis (8) aus zu einem Boden (9) hin verjüngt,
    Erzeugen, mit Hilfe eines Rührmittels (6), eines auf den Boden (9) gerichteten Masseflusses (P3) in einem Volumen (V), das in der Mischkammer (3) enthalten ist und das durch die Komponenten gebildet wird, die zu der Mischkammer (3) transportiert werden, und
    kontinuierliches Transportieren eines Abflusses (P2) eines Gemisches der Komponenten aus der Mischkammer (3).
  11. Verfahren nach Anspruch 10, wobei der Schritt des Erzeugens eines Masseflusses (P3) umfasst, den Massefluss (P3) so einzustellen, dass er beträchtlich höher ist als der Zufluss (P1) und der Abfluss (P2).
  12. Verfahren nach Anspruch 11, wobei der Massefluss (P3) so eingestellt wird, dass er mindestens zehnmal größer ist als der Zufluss (P1) und der Abfluss (P2).
EP03733725A 2002-06-12 2003-06-06 Vorrichtung und verfahren zum kontinuierlichen mischen von komponenten Expired - Lifetime EP1534415B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0201816A SE522476C2 (sv) 2002-06-12 2002-06-12 Anordning och metod för kontinuerlig blandning av komponenter
SE0201816 2002-06-12
PCT/SE2003/000968 WO2003106006A1 (en) 2002-06-12 2003-06-06 Device and method for continuous mixing of components

Publications (2)

Publication Number Publication Date
EP1534415A1 EP1534415A1 (de) 2005-06-01
EP1534415B1 true EP1534415B1 (de) 2010-01-20

Family

ID=20288182

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03733725A Expired - Lifetime EP1534415B1 (de) 2002-06-12 2003-06-06 Vorrichtung und verfahren zum kontinuierlichen mischen von komponenten

Country Status (7)

Country Link
EP (1) EP1534415B1 (de)
AT (1) ATE455586T1 (de)
AU (1) AU2003239008A1 (de)
DE (1) DE60331075D1 (de)
DK (1) DK1534415T3 (de)
SE (1) SE522476C2 (de)
WO (1) WO2003106006A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1070851A (en) * 1963-08-14 1967-06-07 Nat Distillers Chem Corp Continuous process for sodium dispersions
GB1261914A (en) * 1968-03-25 1972-01-26 Silverson Machines Ltd Improvements in mixing apparatus

Also Published As

Publication number Publication date
WO2003106006A1 (en) 2003-12-24
SE522476C2 (sv) 2004-02-10
EP1534415A1 (de) 2005-06-01
DK1534415T3 (da) 2010-05-03
SE0201816L (sv) 2003-12-13
AU2003239008A1 (en) 2003-12-31
DE60331075D1 (de) 2010-03-11
ATE455586T1 (de) 2010-02-15
SE0201816D0 (sv) 2002-06-12

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