EP0431427A2 - Procédé et dispositif d'évacuation de liquides d'une centrifugeuse - Google Patents

Procédé et dispositif d'évacuation de liquides d'une centrifugeuse Download PDF

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Publication number
EP0431427A2
EP0431427A2 EP90122454A EP90122454A EP0431427A2 EP 0431427 A2 EP0431427 A2 EP 0431427A2 EP 90122454 A EP90122454 A EP 90122454A EP 90122454 A EP90122454 A EP 90122454A EP 0431427 A2 EP0431427 A2 EP 0431427A2
Authority
EP
European Patent Office
Prior art keywords
liquid
peeling
peeling tube
tube
drum
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Withdrawn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
EP90122454A
Other languages
German (de)
English (en)
Other versions
EP0431427A3 (en
Inventor
Otto Dipl.-Ing. Büttner
Bruno Dipl.-Ing. Hegnauer
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei 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 Krauss Maffei AG filed Critical Krauss Maffei AG
Publication of EP0431427A2 publication Critical patent/EP0431427A2/fr
Publication of EP0431427A3 publication Critical patent/EP0431427A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
    • B04B11/082—Skimmers for discharging liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/04—Periodical feeding or discharging; Control arrangements therefor
    • B04B11/043—Load indication with or without control arrangements

Definitions

  • the invention relates to a method for withdrawing liquid from a centrifuge according to the preamble of claim 1.
  • centrifuges for separating suspensions in particular in sedimentation centrifuges, it is necessary to regularly remove the liquid that accumulates above the solid layer that is being deposited.
  • a liquid peeling tube is moved into the liquid in the centrifuge drum and the liquid drawn off.
  • the invention is based on the object of specifying a method for operating a centrifuge in which the peeling process can be optimized for liquids.
  • the peeling process is controlled by a sensor which monitors the filling level in the centrifuge drum and / or the surface quality of the filling material, it can be reliably stopped when the liquid has been drawn off. As a result, the duration of the peeling process can be optimized on the one hand, and on the other hand, if the peeling pipe is arranged inside the drum, the peeling pipe can be brought up to the solid surface, so that no liquid residues remain in the drum.
  • FIG. 1 schematically shows a longitudinal section through the drum of a sedimentation centrifuge
  • Fig. 2 shows schematically a cross section through the drum of a sedimentation centrifuge
  • Figure 3 shows the detailed view of one end of a liquid peeling tube.
  • Figure 1 shows a longitudinal section through a drum centrifuge.
  • the suspension to be separated is introduced into the drum chamber via a filling tube 10 and separated by centrifugation into a solid fraction 20 which is deposited on the drum wall 30 and a liquid 40. After the separation process, the liquid 40 is drawn off to the outside through a movable liquid peeling pipe 50.
  • the liquid 40 is not drawn directly from the interior of the drum, but from a ring cup 70 which communicates and rotates with the drum, the movable liquid peeling tube 50 being arranged outside the drum so that it enters the ring cup 70 can be inserted .
  • the ring cup 70 is connected via openings (not shown) to the drum interior. If necessary, the openings can be provided with filter elements.
  • the surface of the material to be separated is monitored by means of a sensor 60 which determines the fill level h and / or the surface quality of the material to be separated.
  • a sensor 60 which determines the fill level h and / or the surface quality of the material to be separated.
  • a sensor is known for example from DE-OS 37 26 227.
  • the liquid peeling tube 50 is pivoted into the liquid 40 after the separation process. There is the risk that on the one hand the liquid peeling tube 50 is not immersed far enough so that the liquid 40 is not or only partially drawn off, or immersed to the extent that a solid portion is also removed.
  • the liquid peeling tube 50 is displaced towards the solid surface at a constant speed during the removal process and at the same time the fill level h of the separating material layer and / or its surface quality is monitored via the sensor 60. If the height h no longer shows any change over time or if a change in the surface condition is indicated, the peeling process is interrupted and the liquid peeling tube 50 is withdrawn.
  • the liquid peeling tube 50 is not immersed in the liquid 40 at a constant speed but with a constant force, whereby the above-mentioned criteria are also used to interrupt the peeling process.
  • FIG. 3 shows a detail of a device that can be used to carry out the method.
  • the liquid peeling pipe 50 is suspended in a bearing (not shown) pivotably in the direction of the arrow and dips into the liquid 40 with the beveled end 50a.
  • buoyancy surfaces 80 At the end 50a of the liquid peeling tube 50 are buoyancy surfaces 80 which, when the drum is rotating, generate a force which counteracts the immersion of the liquid peeling tube 50.
  • the liquid peeling pipe 50 biased towards the liquid surface by a constant force or a constant torque, for example by a spring device, a hydraulic device or by its own weight.
  • the shape of the buoyancy surfaces 80 is adapted to the speed of rotation of the drum in such a way that the buoyancy generated and the constant force of the liquid peeling pipe 50 act in opposition and hold the liquid peeling pipe 50 in the liquid 40.
  • a skid 90 can also be provided at the end of the liquid peeling tube 50 facing the solid portion 20, which prevents impacts when the liquid peeling tube 50 hits the liquid 40 or the solid.
  • the sensor 60 can be dispensed with if the liquid peeling tube 50 is provided with an angle of rotation sensor which determines the angular position of the liquid peeling tube 50, so that the change in the liquid level can be determined on the basis of the angular position. It is advisable to provide the part of the liquid peeling tube 50 facing the surface of the filling material with a sensor for determining the surface properties of the filling material, so that the solids content can be reliably detected.

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  • Centrifugal Separators (AREA)
EP19900122454 1989-12-04 1990-11-26 Method and device for withdrawing liquids from a centrifuge Withdrawn EP0431427A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940053 1989-12-04
DE3940053A DE3940053A1 (de) 1989-12-04 1989-12-04 Verfahren und vorrichtung zum abziehen von fluessigkeiten aus einer zentrifuge

Publications (2)

Publication Number Publication Date
EP0431427A2 true EP0431427A2 (fr) 1991-06-12
EP0431427A3 EP0431427A3 (en) 1992-03-11

Family

ID=6394775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900122454 Withdrawn EP0431427A3 (en) 1989-12-04 1990-11-26 Method and device for withdrawing liquids from a centrifuge

Country Status (4)

Country Link
US (1) US5090953A (fr)
EP (1) EP0431427A3 (fr)
JP (1) JPH03181346A (fr)
DE (1) DE3940053A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3326705A1 (fr) * 2016-11-21 2018-05-30 Andritz KMPT GmbH Centrifugeuse filtrante

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5190515A (en) * 1992-01-13 1993-03-02 Eastman Kodak Company Vacuum degassing apparatus
CA2094620A1 (fr) * 1993-04-21 1994-10-22 Earl Gingras Interface de sortie du liquide reglable au moyen d'un outil, pour separateur centrifuge
SE502682C2 (sv) * 1994-04-21 1995-12-11 Tetra Laval Holdings & Finance Utmatningsorgan för centrifugalseparator
SE9600299D0 (sv) * 1996-01-29 1996-01-29 Tetra Laval Holdings & Finance Utloppsanordning och en centrifugalseparator försedd med en sådan utloppsanordning
CN100417428C (zh) * 2003-09-30 2008-09-10 博奥生物有限公司 离心分离的仪器和方法
DE102005028832A1 (de) * 2005-06-15 2006-12-28 Fima Maschinenbau Gmbh Zentrifugenvorrichtung mit verbesserter Prozessanalysetechnologie
JP2015226861A (ja) * 2014-05-30 2015-12-17 株式会社松本機械製作所 遠心分離機

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US370383A (en) * 1887-09-27 Indelible ink
GB487249A (en) * 1936-02-28 1938-06-16 Erkensator G M B H Improvements in centrifuges for purifying paper pulp
DE656125C (de) * 1936-02-29 1938-01-29 Erkensator G M B H Verfahren und Vorrichtung zum Abfuehren der leichteren Verunreinigungen aus Papierstoffreinigungsschleudern mittels Schaelrohre
CH205508A (de) * 1938-11-28 1939-06-30 Cham Ag Maschf Auslaufeinrichtung an Zentrifugen mit Schälvorrichtung.
US2692725A (en) * 1952-03-19 1954-10-26 Swift & Co Centrifuging apparatus
US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
US3703983A (en) * 1971-01-28 1972-11-28 Laval Separator Co De Method and apparatus for centrifuging fluid mixtures and selectively removing liquid material therefrom
US3734398A (en) * 1971-02-26 1973-05-22 Pennwalt Corp Basket centrifuge with material removing means
DE2603610A1 (de) * 1976-01-30 1977-08-04 Krauss Maffei Ag Zentrifugentrommel mit seitenfiltration
US4516987A (en) * 1983-07-21 1985-05-14 Sundstrand Corporation Deaerator usable in a system for a steam powered torpedo and deaerating method
DE3726227A1 (de) * 1987-08-07 1989-02-16 Krauss Maffei Ag Vorrichtung zum ergebnisabhaengigen steuern einer filterzentrifuge
DE3822225C1 (fr) * 1988-07-01 1989-07-20 Laboratorium Prof. Dr. Rudolf Berthold, 7547 Wildbad, De

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3326705A1 (fr) * 2016-11-21 2018-05-30 Andritz KMPT GmbH Centrifugeuse filtrante

Also Published As

Publication number Publication date
US5090953A (en) 1992-02-25
JPH03181346A (ja) 1991-08-07
DE3940053A1 (de) 1991-06-06
EP0431427A3 (en) 1992-03-11

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