EP0640398A2 - Centrifugeuse - Google Patents

Centrifugeuse Download PDF

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Publication number
EP0640398A2
EP0640398A2 EP94112821A EP94112821A EP0640398A2 EP 0640398 A2 EP0640398 A2 EP 0640398A2 EP 94112821 A EP94112821 A EP 94112821A EP 94112821 A EP94112821 A EP 94112821A EP 0640398 A2 EP0640398 A2 EP 0640398A2
Authority
EP
European Patent Office
Prior art keywords
peeling
centrifuge
liquid
channel
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Withdrawn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
EP94112821A
Other languages
German (de)
English (en)
Other versions
EP0640398A3 (fr
Inventor
Bernward Dipl.-Ing. Feldkamp
Peter Dr. Stelter
Bernd Dipl.-Ing. Schlieperskötter
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.)
Kloeckner Humboldt Deutz AG
Original Assignee
Kloeckner Humboldt Deutz 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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Publication of EP0640398A2 publication Critical patent/EP0640398A2/fr
Publication of EP0640398A3 publication Critical patent/EP0640398A3/fr
Withdrawn legal-status Critical Current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
    • 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 is directed to a centrifuge, in particular to a screw centrifuge, for the separation of liquid-solid mixtures, consisting of a centrifuge drum which is rotatably mounted about its longitudinal axis, with means for feeding the mixture to be separated into the centrifuge drum, with openings in the Centrifuge drum for the discharge of the separated heavy substances (solid) and with a peeling disc for the discharge of the light substances (liquid) from the centrifuge drum, wherein the peeling disc has at least one peeling channel which extends from the periphery of the peeling disc to the center of the peeling disc in one leads in the axial direction discharge channel.
  • the focus is on dewatering the solid as a preliminary stage to thermal drying.
  • the liquid phase flows out of the centrifuge over the weir plates of the centrifuge at high circumferential speed, during which a strong turbulence occurs with the gas (normally air) present in the centrifuge.
  • each peeling channel is assigned a discharge channel, the effective cross section of which can be changed by means of a throttle body.
  • the liquid volume flow discharged through the peeling channels can thus be regulated and adapted to the inlet quantities, so that it is ensured that the entry opening of the peeling channels always remain within the liquid.
  • turbulence can continue to arise within the peeling channels, combined with the suction of gas (air), even with strong throttling behind the peeling disc and thus a small volume flow within the peeling channels.
  • This has the advantage over the throttling behind the peeling disc, that the inlet cross-section is always adapted to the volume flow to be discharged and is not larger than necessary.
  • the peeling channel is according to the invention in the direction of drum rotation, i. H. Crescent-shaped in the direction of liquid rotation and runs divergently from the inlet area on the periphery of the peeling disk to the outlet area in the center of the peeling disk. H. its cross-sectional area increases.
  • the cross-sectional area ratio of the inlet area to the outlet area is advantageously less than 1, preferably less than 0.1.
  • the inventive design of the peeling channel not only advantageously adapts the liquid volume flow to the quantity to be discharged with the aim that the inlet opening of the peeling channel is always immersed in the liquid and no gas (air) is sucked into the peeling channel, but rather in the liquid-containing kinetic energy is converted into potential energy in a soft course with high efficiency and liquid shocks and cavitation are largely suppressed by avoiding turbulence.
  • the partial disks forming the peeling disks are advantageously arranged on tubes which are inserted into one another and which are guided axially from the outside into the centrifuge drum and can be rotated relative to one another from the outside. In this way, it is possible to change the cross-section of the peeling channel in a simple manner from the outside, even during operation of the centrifuge, by rotating the tubes, and thus to adapt the peeling channel to fluctuating operating states of the centrifuge.
  • the inner tube is at the same time also the feed tube through which the mixture to be separated is fed into the centrifuge drum from the outside.
  • Fig. 1 shows a screw centrifuge (10) with an elongated centrifuge drum (11) and a coaxial inside the centrifuge drum (11) rotating screw conveyor (12), with solids discharge openings (13) at the end of the conical part of the centrifuge drum (11) and with a peeling disc (14) arranged at the opposite end of the centrifuge drum (11) for discharging the liquid.
  • the peeling disc (14) is formed from two individual discs (15, 16) which are arranged at a distance from one another on tubes (17, 24) which are inserted into one another, so that there is between the individual discs (15, 16) forms a gap.
  • the individual disks (15, 16) have inner disks (18, 19) screwed on, which, due to their geometry (crescent-shaped contour) and arrangement on the individual disks, have a radial distance from one another and the gap formed by the individual disks (15, 16) partially fill out.
  • These inner disks (18, 19) form the peeling channel (20) in connection with the individual disks (15, 16), which runs from the periphery of the peeling disk to the center of the peeling disk (14).
  • the dimension of the peeling disc (20) is constant in the axial direction and corresponds to the distance between the individual discs (15, 16). In the radial direction, the dimension of the The peeling channel (20) is determined by the radial distance between the inner disks (18, 19), the crescent-shaped curvature of the two inner disks (18, 19) being designed so that the peeling channel (20) from the periphery of the peeling disk (14) to it Center wider and thus the cross section of the peeling channel (14) is constantly increasing.
  • the individual disks (15, 16) forming the peeling disk (14) are placed on each of the nested tubes (17, 24) - in the exemplary embodiment shown, the single disk (15) on the tube (17) and the single disk (16) on the tube (24) - and firmly connected to them, for example by welding.
  • the two nested pipes (17, 24) form a discharge channel (22) between them, which is connected to the peeling channel (20) and which functions - the discharge of the liquid - even when the pipes (17, 24) are rotated against each other maintains and is led out of the centrifuge drum (11) with the two tubes (17, 24).
  • the tubes (17, 24) leading from the outside into the centrifuge drum (11) - the inner tube (17) serves as a feed tube for feeding the suspension to be separated in the direction of arrow 23 into the centrifuge drum (11) - can be rotated relative to one another from the outside and thus also the individual disks (15, 16) attached to the pipe reels (17, 24), whereby the radial distance of the inner disks (18, 19) arranged on individual disks (15, 16) and thus the cross section of the peeling channel (20) changes.
  • the peeling disc (19) described in this exemplary embodiment consists of a total of four parts, the two individual discs (15, 16) on each of the inner discs (18, 19), the base area of which corresponds to approximately half of the one individual disc (15, 16) , is attached.
  • Such a peeling disc (14) can be produced with simple means, in particular the shape of the peeling channel can be adapted to the requirements of the liquid to be discharged by simply replacing the inner discs (18, 19) with correspondingly differently shaped inner discs.
  • the inner disks it is also possible to use more than two inner disks, the inner disks then being able to be arranged axially or radially next to one another. According to the invention, it is also possible to dispense entirely with the inner panes. In this latter case, the peeling channel contours must then be machined out of the individual disks by a metalworking process, for example by milling.

Landscapes

  • Centrifugal Separators (AREA)
EP94112821A 1993-08-25 1994-08-17 Centrifugeuse. Withdrawn EP0640398A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4328369 1993-08-25
DE19934328369 DE4328369A1 (de) 1993-08-25 1993-08-25 Zentrifuge

Publications (2)

Publication Number Publication Date
EP0640398A2 true EP0640398A2 (fr) 1995-03-01
EP0640398A3 EP0640398A3 (fr) 1995-05-31

Family

ID=6495844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94112821A Withdrawn EP0640398A3 (fr) 1993-08-25 1994-08-17 Centrifugeuse.

Country Status (3)

Country Link
EP (1) EP0640398A3 (fr)
JP (1) JPH07163907A (fr)
DE (1) DE4328369A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5800332A (en) * 1996-07-03 1998-09-01 Hensley; Gary L. Decanting centrifuge employing elements with differing rates of rotation
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
WO2000041813A1 (fr) * 1999-01-11 2000-07-20 Westfalia Separator Ag Centrifugeuse comportant deux disques de raclage
WO2003024606A1 (fr) * 2001-09-05 2003-03-27 Westfalia Separator Ag Dispositif racleur a disque d'evacuation de liquide d'un tambour de centrifugeuse
US6986733B2 (en) * 2001-10-02 2006-01-17 Westfalia Separator Industry Gmbh Solid bowl helical conveyor centrifuge with a pressurized housing
US7056273B2 (en) * 2002-05-29 2006-06-06 Westfalia Separator Ag Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof
US7255670B2 (en) * 2004-03-04 2007-08-14 Hutchison Hayes, L.P. Three phase decanter centrifuge
US7510519B2 (en) * 2003-08-08 2009-03-31 Westfalia Separator Ag Solid bowl screw centrifuge comprising a centripetal pump with a throtting device
US20100041535A1 (en) * 2006-02-10 2010-02-18 Westfalia Separator Ag Solid-bowl screw centrifuge and process for its operation
US20140341714A1 (en) * 2013-04-23 2014-11-20 Andritz Frautech S.R.L. Device For Drawing Off Fluid Of A Centrifugation Device
DE102018114843A1 (de) * 2018-03-21 2019-09-26 Gea Mechanical Equipment Gmbh Zentrifuge mit einer Schälscheibe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB494211A (en) * 1936-12-10 1938-10-21 Separator Ab Improvements in paring or skimming devices for centrifugal separators
EP0068869A2 (fr) * 1981-06-30 1983-01-05 Alfa-Laval Separation A/S Centrifugeuse comportant un disque d'écumage pour l'évacuation d'une phase liquide
DE3936150A1 (de) * 1988-12-07 1990-06-13 Nagema Veb K Schaelscheibe fuer zentrifugalseparatoren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1942490U (de) * 1966-03-08 1966-07-14 Flottweg Motoren Werk Dr Georg Vollmantelzentrifuge mit einer schaelscheibe.
DE3518885A1 (de) * 1985-05-25 1986-11-27 Bayer Ag, 5090 Leverkusen Vollmantelschneckenzentrifuge mit nachklaervorrichtung
DE3833063C1 (en) * 1988-09-29 1989-10-05 Westfalia Separator Ag, 4740 Oelde, De Skimming disc for discharging fluids from centrifuge drums

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB494211A (en) * 1936-12-10 1938-10-21 Separator Ab Improvements in paring or skimming devices for centrifugal separators
EP0068869A2 (fr) * 1981-06-30 1983-01-05 Alfa-Laval Separation A/S Centrifugeuse comportant un disque d'écumage pour l'évacuation d'une phase liquide
DE3936150A1 (de) * 1988-12-07 1990-06-13 Nagema Veb K Schaelscheibe fuer zentrifugalseparatoren

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5800332A (en) * 1996-07-03 1998-09-01 Hensley; Gary L. Decanting centrifuge employing elements with differing rates of rotation
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
WO2000041813A1 (fr) * 1999-01-11 2000-07-20 Westfalia Separator Ag Centrifugeuse comportant deux disques de raclage
AU750491B2 (en) * 1999-01-11 2002-07-18 Westfalia Separator Ag Centrifuge comprising two stripping discs
US6623417B1 (en) * 1999-01-11 2003-09-23 Westfalia Separator Ag Centrifuge having a rotatable sleeve and a restriction point
WO2003024606A1 (fr) * 2001-09-05 2003-03-27 Westfalia Separator Ag Dispositif racleur a disque d'evacuation de liquide d'un tambour de centrifugeuse
US6986733B2 (en) * 2001-10-02 2006-01-17 Westfalia Separator Industry Gmbh Solid bowl helical conveyor centrifuge with a pressurized housing
US7056273B2 (en) * 2002-05-29 2006-06-06 Westfalia Separator Ag Solid bowl screw centrifuge comprising a peeling disk, and method for the operation thereof
US7510519B2 (en) * 2003-08-08 2009-03-31 Westfalia Separator Ag Solid bowl screw centrifuge comprising a centripetal pump with a throtting device
US7255670B2 (en) * 2004-03-04 2007-08-14 Hutchison Hayes, L.P. Three phase decanter centrifuge
US20100041535A1 (en) * 2006-02-10 2010-02-18 Westfalia Separator Ag Solid-bowl screw centrifuge and process for its operation
US8444541B2 (en) * 2006-02-10 2013-05-21 Gea Mechanical Equipment Gmbh Solid-bowl centrifuge having a liquid discharge sealed such that a pond level in a separation space remains unchanged when pressurization occurs
US20140341714A1 (en) * 2013-04-23 2014-11-20 Andritz Frautech S.R.L. Device For Drawing Off Fluid Of A Centrifugation Device
US9856879B2 (en) * 2013-04-23 2018-01-02 Andritz Frautech S.R.L. Centrifugation device with adjustable vanes
DE102018114843A1 (de) * 2018-03-21 2019-09-26 Gea Mechanical Equipment Gmbh Zentrifuge mit einer Schälscheibe

Also Published As

Publication number Publication date
DE4328369A1 (de) 1995-03-02
JPH07163907A (ja) 1995-06-27
EP0640398A3 (fr) 1995-05-31

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