WO1991003319A1 - Separateur centrifuge - Google Patents

Separateur centrifuge Download PDF

Info

Publication number
WO1991003319A1
WO1991003319A1 PCT/SE1990/000553 SE9000553W WO9103319A1 WO 1991003319 A1 WO1991003319 A1 WO 1991003319A1 SE 9000553 W SE9000553 W SE 9000553W WO 9103319 A1 WO9103319 A1 WO 9103319A1
Authority
WO
WIPO (PCT)
Prior art keywords
outlet
rotor
chamber
slide
liquid
Prior art date
Application number
PCT/SE1990/000553
Other languages
English (en)
Inventor
Ulf EKLÖF
Original Assignee
Alfa-Laval Separation Ab
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 Alfa-Laval Separation Ab filed Critical Alfa-Laval Separation Ab
Publication of WO1991003319A1 publication Critical patent/WO1991003319A1/fr

Links

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
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge

Definitions

  • the present invention concerns a centrifugal separator com ⁇ prising a rotor, which forms an inlet for a liquid mixture of components, which shall be separated, a separation chamber connected to the inlet, and at least two outlets from the separation chamber, a first outlet of which being located at the centre of the separation chamber and a second outlet being located radially outside the first outlet.
  • the rotor also forms a central annular outlet chamber, which via passages is connec ⁇ ted to the second outlet and is limited by an end wall of the rotor provided with a central opening, through which the separa ⁇ tion chamber is connected to the surroundings of the rotor.
  • the centrifugal separator also comprises a stationary outlet device, which extends into the rotor through the central opening and into the outlet chamber and forms at least one inlet channel, which with one of its ends opens in a, during operation, liquid filled part of the outlet chamber and with its other end opens outside the rotor.
  • Centrifugal separators of this kind are used inter alia in production of vegetable oil and in cleaning of animal oil from water and are disclosed by the Swedish patent publication number 348.121 (corresponding to US 3.752.389), for instance.
  • the centrifugal separator shown in the Swedish patent publica ⁇ tion 348.121 has a rotor with a third outlet located at the greatest radius of the separation chamber. This outlet is opened intermittently, often at equal time intervals, to let out solid particles accumulated at the periphery of the separation chamber. Each time these outlets are opened such a disturbance occurs, which may cause the interface to be displaced past the outlet for the specific heavy component. When such a displace- ment occurs also the specific lighter component flows out through the second outlet.
  • the density of the liquid body decreases in the passages between the second outlet and the outlet chamber and due to this also the counter pressure against the flow through the second outlet created by this liquid body decreases.
  • the supply of the mixture of components has to be interrupted and already separated specific heavier components be supplied to the separation chamber so that a new radial layer of this component is built up in the radially outer part of the separation chamber, whereby the said interface is displaced radially inwards and eventually is located radially inside the second outlet again.
  • the liquid mixture of components can be supplied to the rotor again and the separation can continue.
  • the object of the present invention is to accomplish a centri ⁇ fugal separator, in which said equilibrium can be restored in an easy manner without the need of interruption of the supply of the liquid mixture of the components.
  • a centrifugal separator of the kind initially described is designed according to the invention, with a stationary outlet device which axially outside the end wall of the rotor comprises a part which has a sealing ring surrounding the rotational axis of the rotor.
  • the rotor supports an annular slide, which is arranged to rotate with the rotor and is axially movable relative to the rotor around and outside the central opening in the end wall.
  • This annular slide has a circumferen ⁇ tial wall, which is arranged during axial movement relative to the rotor to seal against the rotor outside and around the central opening, and an annular element extending radially inwards from the circumferential wall between the end wall of the rotor and the sealing surface of the outlet device. Together with the end wall of the rotor the slide forms a radially inwards open groove arranged to receive liquidj which flows out of the outlet chamber through the central opening in the end wall.
  • the annular slide is arranged to be pressed axially relative to the rotor by the rotating liquid in the said groove into sealing abutment against the sealing surface of the outlet device.
  • the sealing surface consists of an annular cirular surface, which has a radial extension and which is concentrical to the rotational axis of the rotor.
  • a throttled passage is suitably arranged beteen the groove and the surroundings of the rotor at the greatest radius of the groove for the drainage of liquid present in the groove.
  • the centrifugal separator shown in the figure comprises a rotor having an upper part 1 and a lower part 2, which are joined together axially by a locking ring 3. Inside the lower part 2 an axially movable valve slide 4 is arranged, which during separation normally abuts sealingly against the upper part 1 and together with it delimits a separation chamber 5.
  • the separation chamber is divided into a number of interspaces by means of a stack of conical separation discs 6. These discs rest on a so called distributor 7 , which in turn rests on the lower part 2.
  • the distributor 7 delimits a central inlet chamber 8 connected to the separation chamber 5 via inlet channels 9. Into the central inlet chamber 8 a stationary inlet tube 10 extends for the liquid mixture of components to be separated.
  • the lower part 2 has a number of outlet openings in the shape of holes. During separation these holes are mainly cut off from communication with the separation chamber 5 but an annular gap between the holes 11 and the separation chamber 5 can intermittently be opened by moving the valve slide 4 axially.
  • the valve slide 4 and the lower part 2 delimits them between a so called closing chamber 12 for closing liquid.
  • the closing chamber 12 has a central inlet 13 and a peripheral throttled outlet 14 having considerable less flow capacity than the inlet.
  • the inlet communicates with an annular supply chamber 15, in which a certain radial liquid level is maintained by means of a stationary supply device 16.
  • the closing liquid present in the closing chamber 12, the inlet 13 and the supply chamber 15 and rotating with the rotor, presses the valve slide axially against an annular gasket, which is arranged in a groove in the upper part of the periphery of the separation chamber.
  • a conical intermediate wall 17 is arranged extending radially outwards to a radially outer part of the separation chamber 5.
  • this intermediate wall 17 has two annular flanges 18 and 19, by means of which the intermediate wall forms a radially inwards open outlet chamber 20.
  • the radial inner edge 21 of the lower flange 18 constitutes ⁇ during operation of the rotor, a first outlet in the form of an overflow outlet, over which a specific lighter, during operation separated component flows out of the separation chamber into the outlet chamber 20.
  • the upper part 1 has an internal annular flange 22 and an annular end wall 23.
  • the intermediate wall 17 and the upper part 1 forms thembetween a number of radially extending passages 25.
  • the radially outer openings of these form a second outlet 26 from the separation chamber 5 at a radially outer part of the same.
  • the radially inner ends of the passages 25 open at the radially inner edge 27 of the flange 22 of the upper part 1.
  • This edge 27 forms an overflow outlet for liquid flowing out of the separation chamber 5 through the passages 25 towards an outlet chamber 24.
  • a stationary outlet device 28 and 29, respectively, is arranged supported by the inlet tube 10.
  • the outlet devices 28 and 29 extend with this internal channels 30 and 31 respectively radially outwards to a radial level somewhat outside the level of the edge of the flange 21 and 27, respectively, over which liquid flows into the outlet chamber 20 and 24 respectively.
  • the outlet devices 28 and 29 are designed as outlet conduits 32 and 33 respec ⁇ tively, extending axially out of the rotor through a central opening 34 in the end wall 23.
  • the outlet conduits are coaxial to the inlet tube 10.
  • the outlet device 33 has a radially extending part 35.
  • the rotor On the outside of the part of the upper part, which constitutes the wall of the outlet chamber, the rotor supports an annular slide 36 rotating with the rotor, the slide being arranged axially movable relative to the rotor around and outside the central opening 34 in the end wall 23.
  • the slide 36 abuts sealingly against the outside of a circumferential wall of the outlet chamber. Together with the end wall 23, the slide 36 forms a radially inwards ooen annular groove 37, which is axially limited by the end wall 23 and by a radially extending element 38 of the slide 36.
  • the slide 36 is axially movable towards the part 35 so that it sealingly can abut against the part 35.
  • a throttled passage 39 between the same and the surroundings of the rotor to the drainage of a liquid present in the groove 37.
  • the rotor Upon start of the centrifugal separator, the rotor is brought to rotate and the separation chamber is closed by supplying closing liquid to the closing chamber through the supply device 16, the supply chamber 15 and the inlet 13.
  • the separation chamber 5 When the separation chamber 5 has been closed, the liquid mixture of components, which are to be separated, can be supplied to the separation chamber 5 through the inlet tube 10, the inlet chamber 8 and the inlet channels 9.
  • the separation chamber 5 is filled up and the rotor reaches operational number of revolutions and the conditions in the separation chamber are stabili ⁇ ied. The components in the liquid mixture are separated under the influence of the centrifugal forces acting on the same.
  • the separation is mainly taking place in the interspaces between the conical separation discs 6.
  • specific heavier components are thrown radially outwards and are accumu ⁇ lated in a radially outer part of the separation chamber 5, the specific most heavy components, such as solid particles, being accumulated at the greatest radius of the separation chamber, while a specific lighter component flows radially inwards in the interspaces.
  • an interface is created between the specific heavier components and the specific lighter component.
  • this interface is located at a radial level somewhat outside the conical discs 6 but inside the second outlet 26, through which a specific heavy component flows out of the separation chamber 5.
  • the most heavy components are let out intermittently when need arises or at equal time intervals through the holes 11. This is taking place by interrupting the supply of closing liquid to the closing chamber.
  • the closing liquid present in the closing chamber flows out through the throttled outlet 14, whereby the closing chamber is emptied.
  • the valve slide 4 is brought by the pressure from the liquid in the separation chamber 5 to move in a way such that an annular gap between the separation chamber 5 and the holes 11 is opened. After a predetermined time period closing liquid is supplied to the closing chamber again and the annular gap is closed.
  • a specific heavier liquid component flows out through the second outlet 26, through the passages 25 over the inner edge 27 of the flange 22 into the outlet chamber 2 .
  • the discharge device arranged in this outlet chamber 24 discharges this component out of the outlet chamber through the internal channels 31.
  • the flow capacity of the outlet device depends on the radial extension of the part of the same extending radially outwards into the rota ⁇ ting liquid body present in the outlet chamber 24. During normal operation an equilibrium will appear, at which the flow into the outlet chamber 24 equals the flow out of the same through the outlet device. At this equilibrium, the rotating liquid body in the outlet chamber 24 extends radially inwards to a radial level samewhat outside the radial inner edge 27 of the flange 22.
  • the specific lighter liquid component flows out of the separa ⁇ tion chamber 5 through the first outlet at the inner edge 21 of the lower flange 18 into the outlet chamber 20. In the same way as the specific heavier liquid component is discharged out of the outlet chamber 24 this liquid component is discharged out of the outlet chamber 20 through the internal channels 30 in the outlet device 28.
  • the said equilibrium at which the interface in the separation chamber 5 between the specific heavier components and the specific lighter component is located at a radial level somewhat outside the conical separation discs 6 but inside the second outlet 26, are exposed to disturbances, as mentioned above.
  • a disturbance occurs for instance upon discharge of specific heavier particles through the holes 11. If this disturbance results in that the interface is displaced radially outwards past the second outlet 26 the equilibrium cannot be maintained but both the specific heavier and the specific lighter liquid component flows out through the second outlet 26 at a very high flow through the passages 25 into the outlet chamber 24. This flow is higher than the maximum capacity of the outlet device 29, whereby the outlet chamber is rapidly filled up and liquid flows out through the central opening 3 .
  • the liquid flowing out through the opening 34 is collected in the annular groove 37 forming a rotating liquid therein.
  • the liquid body acts with a pressure on the radial element 38 and brings the slide 36 to move towards the part 35 and presses the slide to sealing abut ⁇ ment against the same.
  • the slide cuts off the connection between the outlet chamber 24 and the surroundings of the rotor. This makes it possible to fill the different chambers in the rotor even further radially inwards than to the radially outer edge of the opening 34.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Séparateur centrifuge doté d'un rotor, lequel forme une admission (8) pour un mélange liquide de composants, une chambre de séparation (5), une première sortie (21) située au centre dans la chambre de séparation (5) et une seconde sortie (26) située radialement à l'extérieur de la première sortie (21), ainsi qu'une chambre de sortie centrale (24), laquelle est reliée par l'intermédiaire de passages à ladite seconde sortie (26) et communique avec le milieu du rotor par l'intermédiaire d'un orifice central se trouvant dans une paroi terminale (23) délimitant la chambre de sortie (24). Un dispositif (29, 33, 35) de sortie fixe est agencé centralement dans ladite chambre de sortie (24). Afin de rétablir l'équilibre dans le séparateur centrifuge lorsque l'interface entre un composant lourd et un composant léger se trouvant dans ladite chambre de séparation (5) a été déplacé radialement vers l'extérieur au-delà de la seconde sortie (26), ledit séparateur centrifuge est doté d'une coulisse (36) mobile axialement, entourant l'orifice (34). Ladite coulisse (36) comporte une gorge (37) dans laquelle du liquide tournant accumulé exerce une pression contre un élément radial (38) de ladite coulisse (36) et amène cette dernière (36) à se déplacer axialement en position d'étanchéité contre une partie (39) dudit dispositif (29, 33, 35) de sortie.
PCT/SE1990/000553 1989-09-06 1990-08-29 Separateur centrifuge WO1991003319A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8902930A SE464501B (sv) 1989-09-06 1989-09-06 Centrifugalseparator
SE8902930-0 1989-09-06

Publications (1)

Publication Number Publication Date
WO1991003319A1 true WO1991003319A1 (fr) 1991-03-21

Family

ID=20376810

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000553 WO1991003319A1 (fr) 1989-09-06 1990-08-29 Separateur centrifuge

Country Status (2)

Country Link
SE (1) SE464501B (fr)
WO (1) WO1991003319A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6623417B1 (en) * 1999-01-11 2003-09-23 Westfalia Separator Ag Centrifuge having a rotatable sleeve and a restriction point
US20130065744A1 (en) * 2010-03-19 2013-03-14 Per Karlsson Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145556B (de) * 1961-09-25 1963-03-14 Westfalia Separator Ag Selbstoeffnende Schleudertrommel
DE1212889B (de) * 1962-04-02 1966-03-17 Mitsubishi Kakoki Kk Zentrifuge mit Tellereinsatz und intermittierendem Schlammaustrag
US3752389A (en) * 1970-12-07 1973-08-14 Alfa Laval Ab Centrifugal separator with control means
WO1986002021A1 (fr) * 1984-10-08 1986-04-10 Alfa-Laval Separation Ab Separateur centrifuge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1145556B (de) * 1961-09-25 1963-03-14 Westfalia Separator Ag Selbstoeffnende Schleudertrommel
DE1212889B (de) * 1962-04-02 1966-03-17 Mitsubishi Kakoki Kk Zentrifuge mit Tellereinsatz und intermittierendem Schlammaustrag
US3752389A (en) * 1970-12-07 1973-08-14 Alfa Laval Ab Centrifugal separator with control means
WO1986002021A1 (fr) * 1984-10-08 1986-04-10 Alfa-Laval Separation Ab Separateur centrifuge

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6623417B1 (en) * 1999-01-11 2003-09-23 Westfalia Separator Ag Centrifuge having a rotatable sleeve and a restriction point
US20130065744A1 (en) * 2010-03-19 2013-03-14 Per Karlsson Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge
US8702576B2 (en) * 2010-03-19 2014-04-22 Alfa Laval Corporate Ab Device and method for monitoring and adjusting the radial position of an interface layer in a nozzle centrifuge

Also Published As

Publication number Publication date
SE464501B (sv) 1991-05-06
SE8902930L (sv) 1991-03-07
SE8902930D0 (sv) 1989-09-06

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