WO1992011947A1 - Deflecteur centrifuge de solides - Google Patents

Deflecteur centrifuge de solides Download PDF

Info

Publication number
WO1992011947A1
WO1992011947A1 PCT/AU1992/000013 AU9200013W WO9211947A1 WO 1992011947 A1 WO1992011947 A1 WO 1992011947A1 AU 9200013 W AU9200013 W AU 9200013W WO 9211947 A1 WO9211947 A1 WO 9211947A1
Authority
WO
WIPO (PCT)
Prior art keywords
basket
centrifuge
solids
air
cascade
Prior art date
Application number
PCT/AU1992/000013
Other languages
English (en)
Inventor
Gordon Francis Eastaughffe
Original Assignee
W.D.T. (Engineers) Pty. Ltd.
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 W.D.T. (Engineers) Pty. Ltd. filed Critical W.D.T. (Engineers) Pty. Ltd.
Publication of WO1992011947A1 publication Critical patent/WO1992011947A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/12—Other accessories for centrifuges for drying or washing the separated solid particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/02—Other accessories for centrifuges for cooling, heating, or heat insulating
    • 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

  • This invention relates to improvements in continuous flow centrifuges used for the separation of solids from solid-liquid mixtures.
  • the solids which have been separated from the mixture are discharged from the open end of the rotating bowl or basket which forms the separating or drainage mechanism in the centrifuge.
  • the solids which are thus discharged are collected in a stationary casing which surrounds the rotating bowl or basket before exiting from the centrifuge.
  • the invention will be described as applying to the sugar crystals which are being separated from the adhering molasses or syrup by means of a conical perforate basket continuous centrifuge such as is employed for this duty in a sugar mill or refinery.
  • a conical perforate basket continuous centrifuge such as is employed for this duty in a sugar mill or refinery.
  • the centrifuge solids deflector of this invention may be applied to any continuous centrifuge in which a solid is separated from a surrounding liquid.
  • Another object is to improve the drying and cooling of the sugar crystals before discharge from the centrifuge by the evaporation of surface moisture from the sugar crystals under the influence of the air flow through the discharge sections of the rotating basket and stationary casing.
  • a further object is to provide separation into individual crystals of any agglomeration of sugar crystals (discharged from the separating surfaces of the centrifuge basket) by the action of the air flow through the discharge section of the rotating basket.
  • the present invention comprises:-
  • a backward inclined radial cascade forming the discharge section of a rotating perforate continuous centrifuge basket, and which constrains the discharge of the sugar crystals to take place in a direction generally opposite to the direction of rotation of the basket;
  • a radial fan affixed to and rotating with the basket and which discharges air co-current with the flow of the sugar crystals through the cascade and which acts to increase the velocity of the sugar crystals relative to the said cascade and in an opposite direction to the rotation of the basket.
  • a discharge section of the casing surrounding the basket which receives the discharge of the mixture of the sugar crystals and air from the cascade and directs the mixture in the direction of a separating section of the casing.
  • a section of the casing which is shaped to separate the sugar crystals from the air flow before discharge from the centrifuge casing by an alteration in the flow direction of the air.
  • an external fan is used to extract the air from the centrifuge after the separation of the air from the sugar.
  • the volume of air flowing through the fan and cascade may be varied to provide the required acceleration of the sugar crystals through the cascade to suit the peripheral velocity of the basket rim.
  • the optimal condition is for the 'sum of the vectors of the periheral velocity at the basket rim and the maximum discharge velocity of the sugar crystals from the cascade to equal zero (i.e. the discharge velocity is zero relative to the stationary casing) .
  • the discharge velocity of the sugar crystals may vary from the optimal condition but the operating conditions are satisfied if such discharge velocity (relative to the stationary casing) is less than the velocity at which sugar crystals suffer damage by impact or abrasion.
  • the temperature and humidity of the air flowing through the fan and cascade may be varied to suit the temperature and dryness conditions required for the sugar crystal.
  • FIG. 1 shows a partly broken away viev; of a continuous sugar centrifuge incorporating the centrifuge solids deflector.
  • FIG. 2 shows a plan view in part section of the radial cascade which forms the discharge section of the rotating basket, and also the radial fan which is affixed to and rotates with the basket.
  • FIG. 3 Shows a view of a continuous sugar centrifuge including a fan extracting air from the compartment 6 via opening 13 and outlet 15.
  • the unit consists of a conical perforate basket 3 mounted on axial bearings 5 and rotated at high speed by an electric motor drive 7.
  • a fixed casing forming two compartments 4 and 6 supports the whole rotating assembly.
  • Inlet for massecuite at 1 leads to an accelerating chamber 2 which is affixed to and rotates with the perforate basket 3.
  • the massecuite flows from the lower end of the chamber 2 and passes up the inner surface of basket 3 under the gravitational effect of the rotating perforate basket 3.
  • This gravitational effect causes the liquid portion of the massecuite (i.e. molasses or syrup) to separate from the solid portion of the massecuite (i.e. sugar) and to flow outwards through the perforations in the basket 3 into a molasses (or syrup) compartment 4.
  • the sugar continues up the inner surface of basket 3 and is discharged from the upper edge of basket 3 to the sugar compartment 6.
  • the sugar is discharged from the upper edge of the perforate basket 3 at the maximum velocity which it attains during the separating process.
  • the crystals of sugar upon reaching the upper edge of the perforate basket 3 enter an annulus 9, where the crystals are entrained with air being discharged from a radial fan 10 which is affixed to and rotates, with the per orate basket 5 3.
  • the mixture of sugar crystals and air enters a backward inclined radial cascade 11 which forms the discharge section of the rotating perforate basket.
  • the mixture is discharged from the cascade 11 in a direction generally opposite to the direction of -L Q rotation of the basket 3 into the sugar compartment 6.
  • the lower boundary of the cascade 11 is formed by the upper surface of the basket 3; the upper boundary of the cascade 11 is formed by the outer edge of the backing plate of the fan 10.
  • the mixture of air and sugar is separated into its components at 5 the exit from the compartment 6, with the air exiting through opening 13 and the sugar, because of its higher specific gravity, through the opening 14.
  • the opening 13 which forms part of the sugar compartment 6 is connected with an annular duct 16 by a 0 series of tubes as shown typically by tube 17 which are open to allow the passage of air.
  • Each tube (as is shown in Fig. 1) also acts as a structural member to support membrane 18 which forms the outer support for bearing assembly 19.
  • a flanged connection 15 exhausts air from the duct 16.
  • An external fan 20 may be used to exhaust the said air via connection 15 from duct 16.
  • the perforate basket 3 is normally internally lined with a renewable perforate sheet metal filtering surface.
  • a damper 22 is used to control the quantity of air discharged from fan 10.
  • the air supplied to fan 10 may in all cases have the temperature and humidity controlled if so required by the process.
  • the controlling would be external to the centrifuge.
  • the components of the centrifuge solids deflector may be made of any suitable material, such as metal, or may be of moulded plastic or sintered metallic powders.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Déflecteur centrifuge de solides comprenant une cascade radiale inclinée vers l'arrière (11) et comportant un ventilateur radial (9) qui est fixé au panier (3) de l'appareil et tourne avec lui selon un mouvement centrifuge continu. Le dispositif peut servir à réduire la vitesse de solides évacués du panier d'une centrifugeuse continue.
PCT/AU1992/000013 1991-01-14 1992-01-13 Deflecteur centrifuge de solides WO1992011947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPK418191 1991-01-14
AUPK4181 1991-01-14

Publications (1)

Publication Number Publication Date
WO1992011947A1 true WO1992011947A1 (fr) 1992-07-23

Family

ID=3775177

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1992/000013 WO1992011947A1 (fr) 1991-01-14 1992-01-13 Deflecteur centrifuge de solides

Country Status (1)

Country Link
WO (1) WO1992011947A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7204795B2 (en) * 2001-07-19 2007-04-17 Westfalia Separator Ag Deviation ring for a self-distributing centrifuge

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1180328A (en) * 1928-02-17 1928-08-14 Albert John Squire. John Julius Lindman Improvements in or relating to cream separators
GB369195A (en) * 1929-10-02 1932-03-17 Sharples Specialty Co Improvements in or relating to centrifugal separation
GB891481A (en) * 1957-03-19 1962-03-14 Hawksley & Sons Ltd Improvements relating to centrifuges
US3301708A (en) * 1964-05-05 1967-01-31 Buckau Wolf Maschf R Apparatus for separating crystals from sugar syrup
US3604769A (en) * 1968-09-23 1971-09-14 Cryogenic Technology Inc Temperature-controlled spindle for centrifuges and similar apparatus
US3650465A (en) * 1968-11-16 1972-03-21 Broadbent & Sons Ltd Thomas Discharge of solid particles from centrifugal machines
GB1321007A (en) * 1970-05-29 1973-06-20 Halder J Method and apparatus for continuous centrifuging
US3791577A (en) * 1972-08-08 1974-02-12 J Lacher Centrifuge and rotating discharge means therefor
AU7752781A (en) * 1980-12-03 1982-06-10 Bird Machine Company, Inc. Centrifuge

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1180328A (en) * 1928-02-17 1928-08-14 Albert John Squire. John Julius Lindman Improvements in or relating to cream separators
GB369195A (en) * 1929-10-02 1932-03-17 Sharples Specialty Co Improvements in or relating to centrifugal separation
GB891481A (en) * 1957-03-19 1962-03-14 Hawksley & Sons Ltd Improvements relating to centrifuges
US3301708A (en) * 1964-05-05 1967-01-31 Buckau Wolf Maschf R Apparatus for separating crystals from sugar syrup
US3604769A (en) * 1968-09-23 1971-09-14 Cryogenic Technology Inc Temperature-controlled spindle for centrifuges and similar apparatus
US3650465A (en) * 1968-11-16 1972-03-21 Broadbent & Sons Ltd Thomas Discharge of solid particles from centrifugal machines
GB1321007A (en) * 1970-05-29 1973-06-20 Halder J Method and apparatus for continuous centrifuging
US3791577A (en) * 1972-08-08 1974-02-12 J Lacher Centrifuge and rotating discharge means therefor
AU7752781A (en) * 1980-12-03 1982-06-10 Bird Machine Company, Inc. Centrifuge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7204795B2 (en) * 2001-07-19 2007-04-17 Westfalia Separator Ag Deviation ring for a self-distributing centrifuge

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