EP0031549A1 - Kontinuierlich arbeitende Zentrifuge - Google Patents

Kontinuierlich arbeitende Zentrifuge Download PDF

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Publication number
EP0031549A1
EP0031549A1 EP80107986A EP80107986A EP0031549A1 EP 0031549 A1 EP0031549 A1 EP 0031549A1 EP 80107986 A EP80107986 A EP 80107986A EP 80107986 A EP80107986 A EP 80107986A EP 0031549 A1 EP0031549 A1 EP 0031549A1
Authority
EP
European Patent Office
Prior art keywords
drum
wall
collecting wall
solids
centrifuge according
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Withdrawn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
EP80107986A
Other languages
English (en)
French (fr)
Inventor
Hendrikus Johannes Maria Bogaard
Dirk Hoks
Gerrit Albert Riethorst
82 Buntlaan
Johan Frederik Witte
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.)
VERENIGDE MACHINEFABRIEKEN STORK NV
Original Assignee
VERENIGDE MACHINEFABRIEKEN STORK NV
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 VERENIGDE MACHINEFABRIEKEN STORK NV filed Critical VERENIGDE MACHINEFABRIEKEN STORK NV
Publication of EP0031549A1 publication Critical patent/EP0031549A1/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Withdrawn legal-status Critical Current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
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/02—Casings; Lids
    • B04B7/04—Casings facilitating discharge

Definitions

  • the invention relates to a continuously working centrifuge for separating a mixture of solids and of a liquid, with a centrifugal drum, with supply means for the mixture to be separated and with discharge means for conveying the solids along the wall of the drum to a discharge rim of the drum, the solids also under influence of the centrifugal force passing the rim of the drum and leaving the drum.
  • the solids leaving the drum have at the moment of passing the discharge rim of the drum an absolute velocity which is the same as the circumferential velocity of said discharge rim.
  • the direction of the discharge solids corresponds with the direction of the tangent, to the discharge rim in the point of discharge.
  • t .re is the problem that the crystals can easily be damaged as result of collisions with the wall of the casing of the cen- trifu g al and as a result of collisions of the solids with each other.
  • a collecting wall for the solids is arran- g ed, the portion of said collecting wall lying in the region of the plane through the discharge rim of the drum making in the points of intersection of the tangents to the discharge rim and the wall, a small angle with the relevant tangents. Owing to this measure the effect of collision of the solids against the wall is very small and the solids are led along the wall, so that they loose there velocity by friction and by resistance offered by the surrounding air,
  • the collecting wall in the region of the plane through the discharge rim of the drum is lying in the immediate vicinity of the discharge rim.
  • the wall is arranged as near to the discharge rim of the drum as possible, a solid moving tangentially in relation to the discharge rim will deviate only a little from the tangent in the point of contact of that solid and the wall.
  • the collecting wall consists of a cylindrical wall lying co-axially with the drum,
  • the effect aimed at according to the invention can also be obtained if the portion of the collecting wall which is struck by the discharged solids is substantially perpendicular to the axis of the drum.
  • the collecting wall can be in the shape of a surface of revolution, which in a section through the axis has a curved shape.
  • the outer edge portion of the curved surface of revolution forms a transitional portion to a wall lying co-axially with the drum.
  • the solids are led along a curved portion of the wall and at least reach the portion lying co-axially with the drum, from which portion the solids can be easily removed in a direction parallel to the axis of the drum.
  • the collecting wall is lying near the discharge rim of the drum, moreover one has the advantage that the solids which are reflected by the collecting wall deviate with their direction of movement only very little from the direction of movement of the solids just leaving the discharge rim and not being collected by the collecting wall.
  • the collecting wall is in the shape of a part of a conical surface.
  • the collecting wall is mounted by means of adjustable supports, such that the collecting wall can be adjusted in axial direction in relation to the centrifugal drum.
  • the collecting wall is attached by means of these supports for example to the frame of the centrifuge, the collecting wall can be adjusted easily in axial direction and so the place can be determined where the solids will contact the collecting wall,
  • the collecting wall at its inner side is covered with a resilient layer.
  • the resilient layer can form a whole or can be composed of separate elements.
  • the collecting wall at its inner side is smooth or provided with a layer repelling incrustation. Then the risk of incrustation is minimal.
  • means can be provided for heating the collecting wall.
  • the collecting wall conveying means for conveying the collected solids At the lower end of the collecting wall conveying means for conveying the collected solids is provided. So, the collecting solids can be discharged continuously,
  • the conveying means consists of a vibrating conveyor extending around the centrifugal drum.
  • the risk that crystal fracture will occur during the conveying is minimal.
  • the collecting wall can be supported by a frame which is connected to the vibrating conveyor.
  • the collecting wall also will be vibrated, which will diminish the risk of incrustation of crystals on the collecting wall further.
  • the collecting wall is fixed to a support which is mounted co-axially with the axis of the drum and is mounted for rotation in the same direction as the centrifugal drum, however, with a smaller velocity, such that the relative velocity of the solids in relation to the collecting wall is so small, that the risk of fracture of the crystals is further diminished,
  • the centrifuge shown in figure 1 consists of a frame 1 in which a centrifugal drum 2 is supported by means of a shaft 3.
  • the drum 2 is driven through rope pullys 4 and 5 and a rope 6 by an electric motor 7.
  • the drum has a conical seeve wall 8.
  • Inside the drum 2 is arranged a distributing device 9 consisting of a conical cup 10 which rotates with a velocity which is differing somewhatframthe velocity of the centrifugal drum.
  • the mixture to be separated is centrally supplied to this cup through a pipe 11.
  • the distribution device further has a number of vanes 12 between which ducts 13 are lying which adjoins ducts 14 which end on different heights of the wall 8.
  • the material in the cup 10 is divided in right amounts so that through the ducts 14 on every location in the drum the right amount can be supplied.
  • the distribution device is driven by means of a planetary drive means which is arranged inside the shaft 3 and is not shown in particular.
  • the drive shaft 15 of the drive means is driven by means of a pulley 16, a rope 17 and a pulley 18 by an electric motor 19.
  • the conical cup 10 has two distributing devices 9, one of these devices is shown on the left side. Just in advance of the distributing device is arranged a scraper 20. On the right side the scraper 20 is shown which is lying just in advance of the other distributing device and this scraper scrapes the solids which are deposited by the first mentioned distributing device.
  • the mixture which is supplied and in this case consists of a sugar massecuite,is supplied through ducts 13 between the vanes 12 and through the ducts 14 to the seeve wall 8.
  • the sugar is resting on the seeve wall 8 and the liquid is thrown to the outside through the wall 8 and is collected inside the centrifugal casing 21.
  • the liquid, indicated with 22 is discharged through the discharge duct 23.
  • the distributing device 9 and the corresponding scraper 20 move very slowly along the surface of the seeve wall 8 and so the sugar is for some time in rest on the wall 8, before being removed by the scraper 20.
  • the inclination of the wall 8 is such that the sugar is just kept in rest
  • the material of the scraper 20 however, has a lower coefficient of friction than the wall 8 and as soon as the sugar particles are lifted from the wall by the scraper 20 r the friction is not sufficient anymore to keep the particles in rest against the influence of the centrifugal force. Then the particles move in outward direction and are discharged near the upper edge of the scraper 20, said upper edge being at the same height as the discharge rim of the drum 2, The particles which leave the upper edge of the scraper have a very large tangential velocity. These particles are collected by the hood like collecting wall 25 as will be described in the following.
  • the particles which are deflected by the walls 25 are collected on the vibrating conveyor which consists of a ring like trough extending around the centrifugal drum and supported by inclined springs 28 and which is driven by a vibrating device.
  • the sugar collected in the trough 27 is conveyed around the drum to a discharge opening 29 which adjoins a discharge pipe 30,
  • the hood like collecting wall 25 is arranged as near as possible to the drum,
  • the horizontal distance between the discharge rim of the drum at 24 and the portion of the collecting wall 25 lying on the same height is as small as possible.
  • this portion of the collecting wall 25 makes an angle with the axis of the drum which differs only very little from 90°.
  • the particles leaving the drum both seen in a horizontal as well in a ver-. tical plane substantially tangentially contact the collecting wall 25,
  • the effect of the collision of the particles is very small and the particles are gradually.collected by the collecting wall and retarded, Moreover the effect of collision between the particles are smaller when the collecting wall is as near to the discharge rim of the drum as possible,
  • FIG 2 schematically the discharge rim of the drum is indicated with 31. Further are shown a collecting wall 32 lying in the immediate vicinity of the drum and a collecting wall 3 lying on a larger distance of the drum. At 34 a particle leaves the discharge rim 31 along a tangent 35 to the drum. When a particle is reflected it has after reflection of the collecting wall 32 the direction 36, It is clear that a reflected particle which moves in the direction 36 has mainly the same direction of movement as a particle that is not yet reflected. The effect of the collision between these particles is not very important.
  • a particle which leaves the drum at 38 and contacts the collecting wall 32 at 39, will be deflected and then get the direction of the vector 40.
  • the velocity of the collision with the wall is indicated by the vector 41,
  • the component 42 of the vector 41 which is directed perpendicular to the wall has a definite value and as a result of the collision the energy in the direction of the vector 42 gets lost.
  • the particle will contact the wall at 43 and has about the same velocity as in the preceding case and the velocity is indicated by the vector 44,
  • the component directed perpendicularly to.the wall is indicated with 45 and the component directed along the wall is indicated with 46,
  • the component 45 directed perpendicularly to the wall is greater than the corresponding vector 42 from the preceding case, So, here more energy is lost and so the risk of fracturing as a result of the collision is greater.
  • the nearer the collecting wall is to the discharge rim of the drum the smaller the effect of the collistion between the particles and the smaller the effect of the collision against the wall is.
  • Figure 3 shows schematically from above and in a vertical section the velocity vectors.
  • the rim of the drum is indicated with 47
  • a particle discharged from the drum leaves the drum in the direction of the vector 48 and contacts the collecting wall 25 at 49
  • the velocity vector of the further moving particle is indicated with 50 and when the particle is deflected along the wall the path is indicated by the vector 51.
  • the collecting wall is indicated with 25 and in a vertical section through the vector 48 the wall has the shape 25'.
  • a particle which contacts the wall at 49' changes in direction and gets substantially the direction of the vector 52.
  • the particles discharged from the drum are changing their direction by influence of the wallin two planes and as a result the particles will describe a screw like path along the collecting wall and the velocity will decrease under influence of the friction till they leave the wall 25 in vertical direction and are collected on the conveyor 27.
  • the vibrating conveyor 27 is also used for supporting the wall 25.
  • the wall 25 is attached to the trough 27.
  • the vibrating conveyor 27 is driven by means of a crank mechanism 54 whichis driven through a worm drive by an electric motor 56.
  • the wall 25 rotates in relation to the frame 1.
  • the wall 25 for example can rotate at a velocity which is half the velocity of the drum 2. So, the relative velocity of the particles in relation to the collecting wall 25 is smaller and so the effect of the collision becomes smaller and the risk of fracturing also becomes smaller.

Landscapes

  • Centrifugal Separators (AREA)
EP80107986A 1979-12-20 1980-12-17 Kontinuierlich arbeitende Zentrifuge Withdrawn EP0031549A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL7909207 1979-12-20
NL7909207 1979-12-20

Publications (1)

Publication Number Publication Date
EP0031549A1 true EP0031549A1 (de) 1981-07-08

Family

ID=19834359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80107986A Withdrawn EP0031549A1 (de) 1979-12-20 1980-12-17 Kontinuierlich arbeitende Zentrifuge

Country Status (1)

Country Link
EP (1) EP0031549A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742740A1 (de) * 1994-02-08 1996-11-20 Stg Holdings Pty. Ltd. Zentrifugale trennvorrichtung
AU697570B2 (en) * 1994-02-08 1998-10-08 Stg Holdings Pty Ltd Centrifugal separations apparatus
US6267899B1 (en) 1997-04-22 2001-07-31 Stg-Fcb Holdings Pty Ltd. Centrifugal separation apparatus and method of using the same
US7204795B2 (en) * 2001-07-19 2007-04-17 Westfalia Separator Ag Deviation ring for a self-distributing centrifuge

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1293761A (en) * 1968-11-16 1972-10-25 Broadbent & Sons Ltd Thomas Improvements in or relating to the discharge of solid particles from centrifugal machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1293761A (en) * 1968-11-16 1972-10-25 Broadbent & Sons Ltd Thomas Improvements in or relating to the discharge of solid particles from centrifugal machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742740A1 (de) * 1994-02-08 1996-11-20 Stg Holdings Pty. Ltd. Zentrifugale trennvorrichtung
EP0742740A4 (de) * 1994-02-08 1998-04-22 Stg Holdings Pty Ltd Zentrifugale trennvorrichtung
AU697570B2 (en) * 1994-02-08 1998-10-08 Stg Holdings Pty Ltd Centrifugal separations apparatus
US6267899B1 (en) 1997-04-22 2001-07-31 Stg-Fcb Holdings Pty Ltd. Centrifugal separation apparatus and method of using the same
US7204795B2 (en) * 2001-07-19 2007-04-17 Westfalia Separator Ag Deviation ring for a self-distributing centrifuge

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): BE CH DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19811101

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19831105

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HOKS, DIRK

Inventor name: WITTE, JOHAN FREDERIK

Inventor name: BOGAARD, HENDRIKUS JOHANNES MARIA

Inventor name: BUNTLAAN 82

Inventor name: RIETHORST, GERRIT ALBERT