EP0421200B1 - Procédé et appareil de centrifugation de matière à forte viscosité - Google Patents

Procédé et appareil de centrifugation de matière à forte viscosité Download PDF

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Publication number
EP0421200B1
EP0421200B1 EP90118113A EP90118113A EP0421200B1 EP 0421200 B1 EP0421200 B1 EP 0421200B1 EP 90118113 A EP90118113 A EP 90118113A EP 90118113 A EP90118113 A EP 90118113A EP 0421200 B1 EP0421200 B1 EP 0421200B1
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EP
European Patent Office
Prior art keywords
centrifuge
centrifuging
housing
solid material
stage
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
EP90118113A
Other languages
German (de)
English (en)
Other versions
EP0421200A2 (fr
EP0421200A3 (en
Inventor
Dieter Dipl.-Ing. Frässdorf
Paul Heinz Dr.-Ing. Franzen
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.)
BWS Technologie GmbH
Original Assignee
Dorr Oliver Deutschland GmbH
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Filing date
Publication date
Application filed by Dorr Oliver Deutschland GmbH filed Critical Dorr Oliver Deutschland GmbH
Publication of EP0421200A2 publication Critical patent/EP0421200A2/fr
Publication of EP0421200A3 publication Critical patent/EP0421200A3/de
Application granted granted Critical
Publication of EP0421200B1 publication Critical patent/EP0421200B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B30/00—Crystallisation; Crystallising apparatus; Separating crystals from mother liquors ; Evaporating or boiling sugar juice
    • C13B30/04—Separating crystals from mother liquor
    • C13B30/06—Separating crystals from mother liquor by centrifugal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering

Definitions

  • Double centrifuges of the type mentioned above are used to carry out two centrifugal stages which are necessary or desired in terms of process technology as effectively as possible, energy-saving and at the same time requiring as little space or floor space as possible.
  • An example of this is the double centrifuge described in DE-A-34 15 519 for the continuous spinning of the second sugar filling mass of the so-called B sugar.
  • a further development consists in the two centrifugal drums, e.g. in DE-A-36 22 959, while maintaining the same process steps from above, to thereby avoid or dampen vibrations that result from the inevitable unbalance as a result of an uneven distribution of the filling materials.
  • the invention has for its object, according to the known method with at least two spin stages spatially one above the other in a common housing, i.e. With a minimal footprint, this can also be done for highly viscous or / and lumpy suspensions, especially with a sugar filling product.
  • centrifuged material supplied is reduced and homogenized in its viscosity by shear force before entering the preliminary centrifugation. that it can be supplied as a pre-spinning filler.
  • the viscosity for example, of a sugar filling product to be treated in two or more centrifugal stages arranged one above the other is so high that even with a central task in the first spin stage, ie in a pre-accelerator usually present there, a uniform distribution of the filling mass on the top sieve drum can only be achieved to a limited extent. This means that if a double centrifuge with a drive according to DE-A-34 15 519 is used for such a product, the resulting unbalances would be extremely difficult to control. This is the reason why such double centrifuges are not used for such centrifuged goods.
  • the additional process step according to the invention in which the centrifuged material is subjected to a shear force action in a mixing and homogenizing device before it enters the pre-accelerator of the first centrifugal stage, has also made it possible to also make highly viscous or / and lumpy suspensions, such as, for example, refill sugar to treat in two or more centrifugal stages lying one above the other, so that the advantages of this space-saving procedure can also be used for such difficult products. Due to the mechanical influence of shear force-producing mixing tools in the mixing and homogenizing stage, it is possible - by using the tixotropy of a suspension - to reduce the viscosity to such an extent that a even distribution is achieved even with off-center feeding. Under the action of shear, a suspension with lumps or other inhomogeneities is homogenized to such an extent that a creamy filling mass is formed.
  • auxiliary medium to it before the viscosity is reduced and homogenized.
  • the purpose of this auxiliary medium is to provide the amount of liquid that may be required to achieve a predetermined viscosity. But it can also serve as a lubricant.
  • the filtrate spun off from the preliminary centrifugation can advantageously also be used in the case of sugar secondary product filling compound.
  • auxiliary medium preferably to a temperature between 40 and 70 ° C.
  • a continuously operating sieve centrifuge with at least two centrifugal drums which are arranged at a distance from one another and are connected to one another via a common centrifuge shaft driven from above and are housed in a common centrifuge housing, in which the centrifugal material to be treated coming from a feed line is an accelerator, is used to carry out the method according to the invention
  • the upper centrifugal drum can be fed via a control valve and a feed line, in which a mixing and. on the centrifuge housing between the control valve and the feed line
  • Homogenizing device is arranged with a rotor rotating in a housing with bottom and opening and a separate, external drive motor.
  • the centrifuged material to be treated is fed to the mixing and homogenizing device via the control valve.
  • the separate, external drive motor is also advantageous, since with this design a rotor speed that is independent of the spin speed can be freely selected and regulated.
  • the direct construction of the mixing and homogenizing device on the centrifuge lid is also advantageous, since this eliminates the need for pipes and conveying devices.
  • a two-stage centrifuge device is known from US-A-3, 074, 821, which provides a mixer before each centrifuge stage. These mixers are not comparable with the mixing and homogenizing device according to the invention but correspond to the usual mashers.
  • a particularly advantageous embodiment of the invention is that the mixing and homogenizing device is attached to the centrifuge housing by means of a base, that the rotor rotates about a vertical axis and is designed as a pot with a plate and pot wall, the upper edge of which consists of a flange and has a lid formed ring slot and the plate is provided with mixing tools generating shear forces.
  • the centrifugal material can be placed exactly on the inner surface of the plate of the rotor.
  • the centrifuged material which is reduced in viscosity and homogenized by the mixing tools, is guided upwards on the pot wall and into the interior of the housing via the ring slot formed by the flange of the rotor and a cover headed.
  • the advantages of a rotor speed which can be selected independently of the spin speed are shown. This means that it can be optimally matched to the material to be treated.
  • the suspension would not be liquefied or would not liquefy sufficiently; if the speed was too high, the centrifuged goods would be damaged, for example, in the case of a sugar secondary product filling mass, the crystals would break apart if the speed of the mixing tools was above 10 m / s.
  • a possible reflux of the already reduced and homogenized filling compound can be prevented by connecting a downwardly facing collar to the flange of the rotor at a distance from the wall of the pot and by a cylinder engaging in the free space thereby formed, which engages on the floor the housing is attached.
  • a helix which is guided from top to bottom and ends in the lower part in the region of the housing opening can be provided between the housing and the cylinder.
  • connection of the mixing and homogenizing device to the feed line of the centrifuge is carried out in such a way that that a feed to the feed line connects to the housing opening via a sliding plate and that the feed consists of a tube, a rubber sleeve, a tubular sight glass and a connection.
  • a guide cone connected to the control valve opens into the rotor and to this a line for the auxiliary medium is connected, which preferably opens tangentially.
  • the guide cone is guided through the cover of the rotor in the middle and with great play.
  • the double centrifuge 1 housed in a centrifuge housing 2 has the two superimposed centrifugal drums 3 and 4, which are driven by a common centrifuge shaft with an overhead motor 6. Both centrifugal drums 3 and 4 are each provided with a pre-accelerator 7.
  • a mixing and homogenizing device 8 between the control valve 11 and the feed line 9, specifically arranged directly on the centrifuge housing 2.
  • the feed line 9 leads to the pre-accelerator 7 of the upper centrifugal drum 3.
  • the centrifuged material to be treated is fed to the mixing and homogenizing device 8 by means of a feed line 10 and a control valve 11.
  • An auxiliary medium can be added to the centrifuged material by means of a line 12.
  • the mixing and homogenizing device 8 is placed on the centrifuge housing 2 with its housing 16 and a base 14.
  • a rotor 13 is provided within the housing 16 and is driven by a separate, external drive motor 22.
  • the motor 22 is attached to a floor 15.
  • the rotor 13 consists essentially of a pot 18, on the plate 20 mixing tools 17 are attached.
  • the pot 18 is provided with a lid 25 which is supported on spacers 24 and thus forms an annular slot 19 as an outlet opening.
  • the spacers 24 are seated on a flange 26 of the cylindrical cup wall 23.
  • a downwardly projecting, cylindrical collar is attached to the outer circumference of the flange 26, which together with the cup wall 23 forms a free space.
  • a cylinder 28 protrudes into this free space, the lower side of which is firmly connected to the floor 15.
  • the feed 31 consists of a tube 32 to which a cylindrical sight glass 34 is connected by means of a rubber sleeve 33. This in turn is connected to the upper end of the feed line 9, not shown in FIG. 2, by means of a connecting sleeve 35.
  • the mixing and homogenizing device 8 is closed at the top by a seal 39 by means of a cover 38.
  • a guide cone 36 is tightly connected to the cover 38 and projects through the cover 25 into the pot 18 with play.
  • the line 12 for the auxiliary medium opens into this guide cone (preferably tangentially).
  • the control valve 11 is connected to the guide cone 36 by means of a flange 37.
  • the poorly flowing spun material for example a sugar secondary product filling mass, falls on the center of the inner surface 40 of the plate 20, which rotates with its hub 21.
  • the mixing tools 17 ensure a reduction in the viscosity and intimate homogenization of the centrifuged material, the auxiliary agent added via the line 12 simultaneously improving the homogenization and thus the reduction in the viscosity as a lubricant.
  • the initially highly viscous centrifugal material receives a flowable or creamy consistency in the mixing and homogenizing device, so that it can emerge from the bowl 18 of the rotor 13 via the ring slot 19 and thus reach the helix 29.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Centrifugal Separators (AREA)
  • Beans For Foods Or Fodder (AREA)

Claims (10)

  1. Procédé pour centrifuger un produit de centrifugation dans au moins deux étages de centrifugation travaillant en continu, comportant un premier étage de centrifugation, la pré-centrifugation, étage auquel on envoie le produit à centrifuger à traiter, sans dispositif de transport, simplement par gravité, comportant un malaxage pour le produit à centrifuger sortant de la pré-centrifugation et comportant un deuxième étage de centrifugation, la post-centrifugation, étage auquel est envoyé le produit à centrifuger, malaxé, sortant de la pré-centrifugation, de même sans dispositif de transport, simplement par gravité, étant entendu que la pré-centrifugation et la post-centrifugation sont disposées, dans l'espace, l'une au-dessus de l'autre, et, ensemble avec le malaxage, dans un carter commun de centrifugation,
    caractérisé en ce que,
    pour centrifuger un produit de centrifugation se présentant sous la forme d'une suspension à forte viscosité et/ou ayant tendance à la formation de grumeaux, en particulier d'une masse-cuite du dernier jet de sucrerie, on abaisse la viscosité du produit à centrifuger amené et on homogénise le produit, avant son entrée par gravité dans la pré-centrifugation, de telle façon qu'il puisse être envoyé à la pré-centrifugation sous la forme d'une pâte liquide épaisse.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'un adjuvant est ajouté au produit à centrifuger avant l'abaissement de sa viscosité et avant son homogénéisation.
  3. Procédé suivant la revendication 2, caractérisé en ce qu'on utilise comme adjuvant le filtrat séparé par centrifugation au cours de la pré-centrifugation.
  4. Procédé suivant la revendication 2 ou la revendication 3, caractérisé en ce que l'adjuvant est chauffé, de préférence à une température comprise entre 40 et 70°C.
  5. Centrifugeuse à tamis (1) travaillant en continu, pour mettre en oeuvre un procédé suivant l'une quelconque des revendications 1 à 4, comportant au moins deux tambours de centrifugation (3, 4) disposés à une certaine distance l'un au-dessus de l'autre, reliés entre eux par un arbre de centrifugeuse (5) entraîné par le haut, et placés dans un carter (2) de centrifugeuse commun, étant entendu que le produit à traiter par centrifugation, arrivant depuis une conduite d'alimentation (10), peut être envoyé, en passant par une soupape de réglage (11) et un conduit d'alimentation (9), à un accélérateur (7) du tambour supérieur de centrifugation (3),
    caractérisée en ce que, sur le carter (2) de centrifugeuse, entre la soupape de réglage (11) et le conduit d'alimentation, est placé un dispositif (8) de mélangeage et d'homogénéisation, comportant un rotor (13), tournant dans un carter (16) comportant un fond (15) et une ouverture (30) de carter, ce dispositif (8) comportant un moteur d'entraînement (22) séparé, situé à l'extérieur.
  6. Centrifugeuse suivant la revendication 5, caractérisée en ce que le dispositif (8) de mélangeage et d'homogénéisation est fixé, au moyen d'un socle (14), sur le carter (2) de centrifugeuse, en ce que le rotor (13) tourne autour d'un axe vertical et est réalisé sous la forme d'un pot (18), comportant un plateau (20) et une paroi (23), et dont le bord supérieur présente une fente annulaire (19) formée par une bride (26) et un couvercle (25), et dont le plateau (20) est équipé d'outils de mélangeage (17) créant des efforts de cisaillement.
  7. Centrifugeuse suivant la revendication 5 ou la revendication 6, caractérisée en ce que, sur la bride (26) du rotor (13), une collerette (27), tournée vers le bas, se raccorde à la paroi (23) du pot, et en ce que, dans le volume libre ainsi créé, s'engage un cylindre (28), qui est fixé sur le fond (15) du carter (16).
  8. Centrifugeuse suivant l'une quelconque des revendications 5 à 7, caractérisée en ce qu'entre le carter (16) et le cylindre (28), il est prévu une hélice (29), allant de haut en bas et qui se termine, à sa partie inférieure, dans la zone de l'ouverture (30) du carter, et en ce que, sur l'ouverture (30) du carter, une alimentation (31) se raccorde, par l'intermédiaire d'une tôle déflectrice (41), au conduit d'alimentation (9).
  9. Centrifugeuse suivant la revendication 8, caractérisée en ce que l'alimentation (31) est constituée d'un tube (32), d'un manchon de caoutchouc (33), d'un regard en verre (34) de forme cylindrique, et d'un manchon de liaison (35).
  10. Centrifugeuse suivant l'une quelconque des revendications 5 à 9, caractérisée en ce que, dans le rotor (13), débouche un cône déflecteur (36) relié à la soupape de réglage (11) et en ce que, sur celui-ci, est raccordé une conduite (12) pour l'adjuvant, conduite qui débouche, de préférence, tangentiellement.
EP90118113A 1989-10-04 1990-09-20 Procédé et appareil de centrifugation de matière à forte viscosité Expired - Lifetime EP0421200B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933136 1989-10-04
DE3933136A DE3933136A1 (de) 1989-10-04 1989-10-04 Verfahren und vorrichtung zum schleudern eines hochviskosen schleudergutes

Publications (3)

Publication Number Publication Date
EP0421200A2 EP0421200A2 (fr) 1991-04-10
EP0421200A3 EP0421200A3 (en) 1991-11-06
EP0421200B1 true EP0421200B1 (fr) 1994-11-30

Family

ID=6390822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90118113A Expired - Lifetime EP0421200B1 (fr) 1989-10-04 1990-09-20 Procédé et appareil de centrifugation de matière à forte viscosité

Country Status (4)

Country Link
US (1) US5300013A (fr)
EP (1) EP0421200B1 (fr)
AT (1) ATE114509T1 (fr)
DE (1) DE3933136A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU667793B3 (en) * 1995-03-07 1996-04-04 Stg Holdings Pty Ltd Centrifugal separations apparatus and blending apparatus therefor
US6267899B1 (en) 1997-04-22 2001-07-31 Stg-Fcb Holdings Pty Ltd. Centrifugal separation apparatus and method of using the same
US5914145A (en) * 1997-07-30 1999-06-22 Packer; Scott Method for removing contaminants from food
US6095965A (en) * 1997-08-06 2000-08-01 Sortech Separation Technologies Ltd. Centrifugal separator for dry components
US6439394B1 (en) 2000-02-17 2002-08-27 Sortech Separation Technologies, Ltd. Separator for dry separation of powders
DE10343376B4 (de) * 2003-09-17 2008-01-24 Braunschweigische Maschinenbauanstalt Ag Kontinuierlich arbeitende Siebzentrifuge sowie Verfahren zur Aufbereitung von Kristallsuspensionen

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US617466A (en) * 1899-01-10 Apparatus for separating precious metals from their ores
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US2542456A (en) * 1947-08-26 1951-02-20 Laval Separator Co De Standardizing centrifugally separable product
DE901011C (de) * 1952-05-30 1954-01-07 Siemens Ag Verbrennungskraftmaschine
GB794949A (en) * 1956-08-09 1958-05-14 Hepworth Machine Company Inc Improvements in or relating to centrifugal strainer separators for continuous sugar drying
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US3048559A (en) * 1958-12-10 1962-08-07 Columbian Carbon Method of compounding carbon black and rubber
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DE2014519B2 (de) * 1970-03-25 1977-02-03 Palyi, Leslie, Don Mills, Ontario (Kanada) Vorrichtung zum befeuchten von getreide
US3811614A (en) * 1973-06-05 1974-05-21 Atlantic Richfield Co Method for centrifuging of tar sands froth
US3998382A (en) * 1974-11-01 1976-12-21 Klockner-Humboldt-Deutz Aktiengesellschaft Mechanism for degasification of a viscous liquid by means of centrifugal action
GB1584776A (en) * 1976-08-06 1981-02-18 Gordon M Centrifugal homogeniser
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DE3622959C2 (de) * 1986-07-09 1996-12-12 Dorr Oliver Deutschland Kontinuierlich arbeitende Siebzentrifuge mit obenliegendem Antrieb

Also Published As

Publication number Publication date
ATE114509T1 (de) 1994-12-15
EP0421200A2 (fr) 1991-04-10
DE3933136A1 (de) 1991-04-18
US5300013A (en) 1994-04-05
EP0421200A3 (en) 1991-11-06
DE3933136C2 (fr) 1992-03-19

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