EP0203442A2 - Centrifugeuse décanteuse à bol plein comportant un dispositif de clarification finale - Google Patents

Centrifugeuse décanteuse à bol plein comportant un dispositif de clarification finale Download PDF

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Publication number
EP0203442A2
EP0203442A2 EP86106453A EP86106453A EP0203442A2 EP 0203442 A2 EP0203442 A2 EP 0203442A2 EP 86106453 A EP86106453 A EP 86106453A EP 86106453 A EP86106453 A EP 86106453A EP 0203442 A2 EP0203442 A2 EP 0203442A2
Authority
EP
European Patent Office
Prior art keywords
screw
clarifying
drum
cylindrical
dehumidifying
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86106453A
Other languages
German (de)
English (en)
Other versions
EP0203442A3 (fr
Inventor
Wolfgang Dr. Bender
Dieter Dipl.-Ing. Mrotzek
Bernd Prof. Dr. Koglin
Karl-Heinz Dipl.-Ing. Steiner
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.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0203442A2 publication Critical patent/EP0203442A2/fr
Publication of EP0203442A3 publication Critical patent/EP0203442A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the invention relates to a solid-bowl screw centrifuge, consisting of a cylindrical clarifying part, a conical dehumidifying part, a single- or multi-course, leading or lagging band or full-leaf screw, a suspension inlet opening at the end of the clarifying part or between the clarifying and dehumidifying part, and an overflow weir or a peeling pipe Liquid drain on the clarification section and a solids discharge on the dehumidification section.
  • Centrifuges of this type are used in process engineering to separate solid and liquid phases in suspensions. The separation is based on the fact that the solid sediments outwards by the centrifugal force and that in the conical / cylindrical rotating drum a screw running at a slightly different speed conveys the settled solid for discharge at the dehumidifying part.
  • Ullmanns Encylopadie der Technischen Chemie Volume 1, 3rd edition, 1951; F. Ch. Alt, W. Gösele, application criteria for decanters, Chem. - Ing. -Techn. 54 ( 1982) 5, 425-430, W. Stahl, Th. Langeloh: To improve clarification in decanting centrifuges, Chem. -Ing. -Techn. 55 (1983) 4, 324-325; DE-OS 2 321 653; GM 1 760 883).
  • the invention is based on the object: in a solid-bowl screw centrifuge of the type described at the outset to improve the degree of separation by means of special internals.
  • the screw is attached to a cylindrical hollow screw core in the cylindrical clarifying part, the outer surface of which is wholly or partly equipped with a radially flow-through secondary clarifier and that the liquid drain is located directly on or within the screw core.
  • the secondary clarifier preferably consists of a filter medium applied to the perforated screw core.
  • the secondary clarification device can consist of a lamella separator with a large number of slanted slats which are arranged parallel to one another on the screw core.
  • a backwashing process is advantageously provided at the end of the clarifying part. This backwashing process is preferably designed as a siphon that opens automatically at periodic intervals during operation of the centrifuge.
  • a drum 2 is rotatably arranged in a housing 1. Within the drum 2 there is a rotatably arranged screw conveyor 3. The drum 2 and the screw 3 rotate at slightly different speeds, so that there is a low frequency difference between the drum and the screw.
  • Drum 2 and screw 3 are tapered towards solids discharge 4 (dehumidifying part 11).
  • the drum and screw are cylindrical - (clarifying part 1).
  • the suspension the solid phase of which is to be separated, enters the centrifuge space through the axial suspension inlet 5, which is carried out up to approximately the boundary between clarifying part 1 and dehumidifying part 11 (arrows 6).
  • the specifically heavier solid 7 is thrown outwards and conveyed to the solid discharge 4 due to the relative movement of the drum 2 and screw 3.
  • the liquid phase forms the sump 8.
  • the clarified liquid (Rltrat) is drawn off in the clarifying section with a peeling tube 9 and conveyed out of the centrifuge through a tube 10 concentric with the suspension inlet 5.
  • a secondary clarifier is installed in the clarifying part 1 in the flow direction in front of the peeling tube 9. It consists of a perforated (perforations 11) filter drum 12 which simultaneously forms the screw core in the clarifying part 1.
  • the filter drum 12 is covered with a suitable filter medium, e.g. a filter cloth, covered.
  • the peeling tube 9 is - as already mentioned above - inside the filter drum 12.
  • the outer surface of the filter drum 12 can be divided into individual filter elements, e.g. Filter bags to be divided.
  • the filter medium must be cleaned from time to time to avoid clogging (laying). Backwashing of the filter is provided for this purpose.
  • Backwashing can take place by interrupting the suspension supply after reaching a certain liquid level in the drum 12 and at the same time adding backwashing liquid (filtrate) from the filtrate time.
  • backwashing liquid filtrate
  • the normal removal of filtrate with the help of the peeling tube 9 remains blocked.
  • the liquid then flowing backwards through the filter medium to the front weir ensures that the fine particles in the filter medium are rinsed off.
  • the siphon overflow is - as shown in Figure 1 - slightly within the level of the peeling pipe.
  • a backwashing device With such a backwashing device, a rapid emptying of the drum 2 is possible with increased backwashing of the filter, provided that the filtrate is discharged at a radius such that sufficient liquid can accumulate inside the screw core.
  • the backwashing siphon 13 could also be replaced by an adjustable peeling device. In this way, the backwashing process with the suspension feed closed, e.g. periodically initiated easily.
  • Such a device would also offer the advantage that the sump (remaining volume of the liquid) can be skimmed off before the centrifuge stops.
  • the solid-bowl screw centrifuge according to FIG. 2 is in principle constructed similarly to the centrifuge according to FIG. 1.
  • the secondary clarification device in the cylindrical clarifying part 1 does not consist of a filter here but a lamella separator 14.
  • the lamella separator 14 is formed by a large number of inclined slats 15 arranged parallel to one another on the screw core .
  • the separating fins 15 are spaced e.g. 1 mm at an angle of inclination of 30 ° to 60 ° on the screw core 12.
  • the plate pack acts like a static plate separator or plate separator.
  • the particles deposited in the lamella 15 are thrown back into the drum as a coherent layer as soon as a certain layer thickness is reached or exceeded.
  • the outlet for the clarified liquid is designed as an adjustable overflow weir 16.
  • filter media or lamella separator depends primarily on the material system to be separated. If the density difference between solid and liquid is low, the filter system for post-curing will be cheaper. At higher density differences, the clarification with fins should be superior. In the case of very fine particles whose backwashing from the filter medium is difficult, filter aids, for example based on cellulose, can also be used. However, their density should then be lower or at most the same as the density of the suspension.

Landscapes

  • Centrifugal Separators (AREA)
EP86106453A 1985-05-25 1986-05-13 Centrifugeuse décanteuse à bol plein comportant un dispositif de clarification finale Withdrawn EP0203442A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3518885 1985-05-25
DE19853518885 DE3518885A1 (de) 1985-05-25 1985-05-25 Vollmantelschneckenzentrifuge mit nachklaervorrichtung

Publications (2)

Publication Number Publication Date
EP0203442A2 true EP0203442A2 (fr) 1986-12-03
EP0203442A3 EP0203442A3 (fr) 1988-05-25

Family

ID=6271656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86106453A Withdrawn EP0203442A3 (fr) 1985-05-25 1986-05-13 Centrifugeuse décanteuse à bol plein comportant un dispositif de clarification finale

Country Status (3)

Country Link
US (1) US4714456A (fr)
EP (1) EP0203442A3 (fr)
DE (1) DE3518885A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0535658A1 (fr) * 1991-09-30 1993-04-07 LINDE-KCA-Dresden GmbH Réacteur pour le traitement des matériaux solides et liquides à contre-courant
WO2013135233A3 (fr) * 2012-03-10 2014-06-12 Flottweg Se Centrifugeuse à tambour présentant un dispositif d'accélération à l'entrée et un dispositif de freinage à la sortie

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK154540C (da) * 1986-05-06 1989-04-24 Alfa Laval Separation As Dekantercentrifuge
DE4005755A1 (de) * 1989-10-17 1991-04-18 Kloeckner Humboldt Deutz Ag Vollmantel-schneckenzentrifuge
US5067939A (en) * 1990-03-21 1991-11-26 Bird Machine Company Conveyorless clarifier
US5403486A (en) * 1991-12-31 1995-04-04 Baker Hughes Incorporated Accelerator system in a centrifuge
DE4328369A1 (de) * 1993-08-25 1995-03-02 Kloeckner Humboldt Deutz Ag Zentrifuge
US5364335A (en) * 1993-12-07 1994-11-15 Dorr-Oliver Incorporated Disc-decanter centrifuge
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
CN1088629C (zh) * 1999-11-08 2002-08-07 吕资谷 静流式卧式螺旋离心机
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
US6561965B1 (en) 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
DE102010020901A1 (de) 2010-05-18 2011-11-24 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge
CN103586141B (zh) * 2012-08-15 2016-09-28 钦州鑫能源科技有限公司 离心分离装置
EP3106230B8 (fr) * 2015-06-19 2020-04-15 Andritz S.A.S. Centrifuge de décantation
WO2023175538A1 (fr) * 2022-03-15 2023-09-21 Flsmidth A/S Décanteur centrifuge à lamelles pour récupération de fines améliorée

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622794A (en) * 1948-09-16 1952-12-23 Sharples Corp Centrifugal separator
DE965027C (de) * 1951-05-16 1957-05-29 Separator Ab Zentrifuge zum Trennen adsorbierender und/oder neutralisierender Feststoffe aus mineralischen, pflanzlichen oder tierischen OElen
DE1760883U (de) * 1957-12-06 1958-01-30 Krauss Maffei Ag Zentrifuge zum trennen von suspensionen mit einem gegenueber der fluessigkeit spezifisch leichreren feststoff.
FR1441639A (fr) * 1965-04-27 1966-06-10 Sharples France Perfectionnements apportés aux appareils séparateurs centrifuges à vis extractrice
FR1449063A (fr) * 1965-07-02 1966-08-12 Sharples France Perfectionnements apportés aux appareils séparateurs centrifuges, notamment du type à vis d'extraction
FR1449064A (fr) * 1965-07-02 1966-08-12 Sharples France Perfectionnements apportés aux appareils centrifuges, plus spécialement à vis d'extraction
DE1482721A1 (de) * 1964-07-18 1969-06-12 Thrige Titan As Separator
FR2227031A1 (fr) * 1973-04-28 1974-11-22 Bayer Ag

Family Cites Families (14)

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Publication number Priority date Publication date Assignee Title
DE1020575B (de) * 1954-06-15 1957-12-05 Const Guinard Kontinuierlich arbeitende Vollmantel-Zentrifuge mit Feststoffaustrag durch eine Transportschnecke
DE1976574U (de) * 1963-06-01 1968-01-04 Voith Gmbh J M Schneckenzentrifuge.
DE1432822A1 (de) * 1963-09-28 1969-05-29 Kloeckner Humboldt Deutz Ag Vollmantelzentrifuge zur kontinuierlichen Trennung von Feststoff-Fluessigkeits-Gemischen
US3348767A (en) * 1965-04-19 1967-10-24 Bird Machine Co Centrifugal separator
US3501346A (en) * 1966-12-22 1970-03-17 Sugar Cane Growers Coop Treatment of sugar mill clarifier mud
US3575709A (en) * 1968-08-20 1971-04-20 Bird Machine Co Method of cleaning sugar crystals
DE2147406A1 (de) * 1971-09-22 1973-04-05 Flottweg Werk Bruckmayer Schnecke fuer eine vollmantelschneckenzentrifuge
US3795361A (en) * 1972-09-06 1974-03-05 Pennwalt Corp Centrifuge apparatus
SU539611A1 (ru) * 1974-06-25 1976-12-25 Проектный И Научно-Исследовательский Институт "Гипроникель" Пакет сепарирующих тарелок к центрифуге
SE398868B (sv) * 1976-07-23 1978-01-23 Weibull Ab Ingenjorsfirman Nils Anordning for utmatning av stortgods ur ett forradsutrymme
US4209128A (en) * 1979-04-06 1980-06-24 Yara Engineering Corporation Methods and apparatus for classifying fine particle solids
US4334647A (en) * 1980-12-03 1982-06-15 Bird Machine Company, Inc. Centrifuges
DE3202294C1 (de) * 1982-01-26 1983-04-21 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor
DE3216393A1 (de) * 1982-05-03 1983-11-03 Bayer Ag, 5090 Leverkusen Schneckenzentrifuge mit waschvorrichtung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2622794A (en) * 1948-09-16 1952-12-23 Sharples Corp Centrifugal separator
DE965027C (de) * 1951-05-16 1957-05-29 Separator Ab Zentrifuge zum Trennen adsorbierender und/oder neutralisierender Feststoffe aus mineralischen, pflanzlichen oder tierischen OElen
DE1760883U (de) * 1957-12-06 1958-01-30 Krauss Maffei Ag Zentrifuge zum trennen von suspensionen mit einem gegenueber der fluessigkeit spezifisch leichreren feststoff.
DE1482721A1 (de) * 1964-07-18 1969-06-12 Thrige Titan As Separator
FR1441639A (fr) * 1965-04-27 1966-06-10 Sharples France Perfectionnements apportés aux appareils séparateurs centrifuges à vis extractrice
FR1449063A (fr) * 1965-07-02 1966-08-12 Sharples France Perfectionnements apportés aux appareils séparateurs centrifuges, notamment du type à vis d'extraction
FR1449064A (fr) * 1965-07-02 1966-08-12 Sharples France Perfectionnements apportés aux appareils centrifuges, plus spécialement à vis d'extraction
FR2227031A1 (fr) * 1973-04-28 1974-11-22 Bayer Ag

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0535658A1 (fr) * 1991-09-30 1993-04-07 LINDE-KCA-Dresden GmbH Réacteur pour le traitement des matériaux solides et liquides à contre-courant
WO2013135233A3 (fr) * 2012-03-10 2014-06-12 Flottweg Se Centrifugeuse à tambour présentant un dispositif d'accélération à l'entrée et un dispositif de freinage à la sortie

Also Published As

Publication number Publication date
US4714456A (en) 1987-12-22
DE3518885A1 (de) 1986-11-27
EP0203442A3 (fr) 1988-05-25

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Inventor name: STEINER, KARL-HEINZ, DIPL.-ING.

Inventor name: MROTZEK, DIETER, DIPL.-ING.

Inventor name: BENDER, WOLFGANG, DR.

Inventor name: KOGLIN, BERND, PROF. DR.