WO1989008502A1 - Separateur centrifuge - Google Patents

Separateur centrifuge Download PDF

Info

Publication number
WO1989008502A1
WO1989008502A1 PCT/SE1989/000099 SE8900099W WO8908502A1 WO 1989008502 A1 WO1989008502 A1 WO 1989008502A1 SE 8900099 W SE8900099 W SE 8900099W WO 8908502 A1 WO8908502 A1 WO 8908502A1
Authority
WO
WIPO (PCT)
Prior art keywords
department
rotor
liquid
centrifugal separator
inlet chamber
Prior art date
Application number
PCT/SE1989/000099
Other languages
English (en)
Inventor
Per Karlsson
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 WO1989008502A1 publication Critical patent/WO1989008502A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention concerns a centrifugal separator comprisisng a rotor, which forms a first inlet chamber for a liquid mixture of components, which are to be separated in the rotor, a separation chamber, which communicates with the first inlet chamber, outlets of the separation chamber for components separated therein, and a second inlet chamber for an additional liquid.
  • This inlet chamber is separated from the first inlet chamber and via a passage it communicates with a, during operation, liquid filled part of the separation chamber.
  • the centrifugal separator also comprises devices for the supply of the liquid mixture and the additional liquid to the respective inlet chambers.
  • the two devices for the supply of the liquid mixture and the additional liquid are arranged stationary, the device for the supply of the additional liquid being arranged within the device for the supply of the liquid mixture.
  • the former device then is inserted through an opening in the rotating wall separating the two inlet chambers and opens in the second inlet chamber, in which entraining means are arranged.
  • the highest possible pressure of the additional liquid at the orifice of the passage, caused by rotation of liquid present during operation in the passage and in the entrainment chamber, is limited in these centrifugal separators by the radius of said opening in the rotating wall, since the entrainment chamber cannot be filled radially inwards further than to this radius.
  • the density of the supplied additional liquid is lower than the density of the supplied liquid mixture, whereby one often cannot obtain a pressure in the additional liquid sufficient to get a flow through the passage.
  • US 2,599,619 shows a supply device for an additional liquid in which this liquid is supplied through channels in the driving shaft of the rotor.
  • the additional liquid can be supplied at a high pressure.
  • the supplied additional liquid has a very high temperature. If this liquid is conducted through the driving shaft, the latter and the bearings supporting the shaft are heated. This often means a serious reduction of the life of the bearings.
  • the object of the present invention is to provide a centrifugal separator of the kind initially described, in which the additional liquid can be suppplied at a high pressure even at a high temperature without reduction of the life of the bearings.
  • this object can be achieved in that the second inlet chamber by means of a partition, which is connected to the rotor and surrounds its rotational axis, is divided into two departments, a first one of which is arranged to receive an additional liquid from one of said supply device and a second one of which communicates with the first department via a centrally located opening in the partition and with the separation chamber via said passage; that a preferably stationary pump device extends radially outwards into said first department and forms at least one pump channel having an inlet end located in a part of the first department, which is filled with liquid when additional liquid is supplied during operation; and that said pump device in cooperation with said partition is arranged essentially to shut off the second department from communication with the surroundings of the rotor and from other spaces in the rotor, enabling a liquid pressure to be built up in the second department which is higher than the liquid pressure prevailing in the first department.
  • the additional liquid is brought to rotate with the rotor in the first department.
  • the energy thus obtained in the entrained additional liquid is recovered in the form of pressure energy by means of the stationary pump device.
  • the additional liquid is again brought to rotate with the rotor.
  • the pressure from the liquid rotating in the second department is added to and acts together with the pressure obtained by the stationary pump device and gives a high pressure at the orifice of the passage in the separation chamber without the need of being supplied via the driving shaft of the rotor.
  • fig. 1 shows an axial longitudinal section through an embodiment thereof
  • fig. 2 shows a section through a preferred embodiment of the pump device in fig. 1 seen axially.
  • the centrifugal separator shown in figure 1 has a rotor 1, which is arranged in a casing 2 and is supported and driven by a driving shaft 3. Through a central opening 4 in one (in the figure the upper) end of the rotor a stationary device 5 in the shape of a tube is inserted for the supply of a liquid mixture of different components, which are to be separated in a separation chamber 6 within the rotor 1.
  • a distributor 7 is arranged connected to the rotor, the distributor surrounding the device 5 and forming together with it and other rotor parts a first inlet chamber 8, in which the device 5 opens.
  • a stack 9 of a number of conical separation discs is arranged around the distributor 7.
  • the main separation Is taking place.
  • a specific heavier component in the liquid mixture then flows radially outwards in these gaps and is accumulated in the radially outermost part of the separation chamber, wherefro it is thrown out through nozzles 10 arranged in the outer wall 11 of the rotor 1.
  • a specific lighter component in the liquid mixture flows during separation radially inwards and further towards a central outlet 4.
  • the outlet is designed as an overflow outlet, which at the same time constitutes the opening through which the inlet device 5 is inserted into the rotor.
  • a device 12 Centrally within and coaxially with the outlet device 5 a device 12 is arranged for the supply of an additional liquid to the rotor.
  • a wall 13 Centrally in the first inlet chamber 8 a wall 13 is arranged fixedly connected to the rotor, the wall surrounding the rotational axis of the rotor and forming a second inlet chamber 14 and having a central opening 15, which is turned towards the above mentioned opening 4 and through which the supply device 12 extends.
  • a partition 16 In the second inlet chamber 14 a partition 16 is arranged dividing the same in a first department 17 in which the device 12 opens, and a second department 18.
  • entraining means 19 are arranged which in the shown example consist of a number of wings distributed in the circumferential direction.
  • a stationary pump device 20 is arranged, which has at least one pump channel 21 extending from radially outer parts of the first department 17 radially inwards towards a central part of a second department 18.
  • This department 18 communicates with the first department 17 via a central opening 22 in the partition 16.
  • From the second department at least one passage 23 extends radially outwards and opens in its opposite end in a radially outer, during operation, liquid filled part of the separation chamber 6. Through this passage 23 the additional liquid is supplied to the separation chamber 6 from the second department 18.
  • the pump device 20 is fixedly connected to parts, which form the device 12.
  • the central part of the second department 18 is essentially closed but communicates with the radially innermost part of the first department 17 via a throttled evacuating channel 24.
  • the pump channels 21 in the pump device 20 shown in figure 2 are formed by the curve shaped channel walls 25 having an axial extension. At the periphery of the pump device the pump channels 21 have an essential tangential direction, whereas they at their radially innermost parts have an essential radial direction. Furthermore, the pump channels 21 are diverging.
  • centrifugal separator of the kind, to which the Invention is to be referred, is presumed to be known, and therefore only the function of parts interesting for the invention is described in the following.
  • the additional liquid is supplied to the separation chamber Intermittently whereas it is supplied continuously in other applications.
  • the present invention is applicable upon intermittent as well as continuous supply of the additional liquid.
  • the additional liquid supplied through the device 12 flows into the first department 17 where it comes into contact with the wings 19 arranged therein and is effectively given the rotational speed of the rotor.
  • the rotating liquid present in this department 17 forms a rotating liquid body with a radially inwards turned free liquid surface.
  • the stationary pump device 20 arranged in this department then extends with its pump channels 21 radially out into the rotating liquid body.
  • the additional liquid is then made to flow radially inwards in the pump channels towards a central part of the second department 18.
  • the first department 17 is gradually filled up radially inwards, the capacity of the pump device 20 increasing until the capacity of the pump device 20 equals the flow of the supplied additional liquid.
  • the second department 18 is upon the supply of the additional liquid filled up all the way to the centre.
  • the additional liquid entering the first department 17 gets, as a result of the rotation obtained therein, an increased energy content.
  • this is recovered by giving the liquid leaving the same a high pressure.
  • the embodiment of the pump device 20 according to fig. 2 which has diverging pump channels 21, which are tangentlally directed at the periphery of the pumping device 20 and radially directed towards the centre, effectively recovers the energy content of the rotating liquid body in the first department 17. Namely, this also can transform a relatively large amount of the kinetic energy in the liquid rotating in the first department 17 to pressure energy, the liquid leaving the pump device 20 being not rotating noteworthly.
  • the rotating liquid body in the second department 18 and in the passage 23 acts as a consequence of the centrifugal force at a pressure at the orifice of the passage 23 at the periphery of the separation chamber 6, which Is added to the pressure in the liquid at the outlet of the pump device 20.
  • an additional liquid can be supplied to the periphery of the separation chamber 6 even though a high pressure prevails there.
  • the pump device 20 is arranged stationary. Naturally, it is possible to arrange the pump device 20 partly entrained.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Le séparateur centrifuge décrit comprend un rotor (1), qui forme une première chambre d'entrée (8) pour un mélange liquide de composants, une chambre de séparation (6), des sorties (4, 10) pour les composants séparés et une seconde chambre d'entrée (14) pour un liquide additionnel. Cette seconde chambre d'entrée (14) est séparée de la première chambre d'entrée (8) et communique via un passage (23) avec une partie radialement externe de la chambre de séparation (6). Le séparateur centrifuge comporte également des dispositifs (5, 12) servant à acheminer le mélange liquide et le liquide additionnel dans les chambres d'entrée respectives. Pour permettre un acheminement du liquide additionnel à une pression élevée, la seconde chambre d'entrée (14) est divisée par une cloison (16) en un premier compartiment (17) destiné à recevoir le liquide additionnel provenant d'un dispositif d'acheminement (12) et en un second compartiment (18) qui communique avec le premier compartiment via une ouverture centrale (22) et avec la chambre de séparation (6) via ledit passage (23). Dans le premier compartiment (17) est placé un dispositif à pompe (20) formant au moins un canal de pompe. Le dispositif à pompe (20) coupe conjointement avec la cloison (16) la communication du second compartiment (18) avec les environs du rotor et avec les autres espaces du rotor.
PCT/SE1989/000099 1988-03-11 1989-03-03 Separateur centrifuge WO1989008502A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8800892A SE460707B (sv) 1988-03-11 1988-03-11 Centrifugalseparator med inloppsorgan innefattande pumpanordning foer ytterligare vaetska
SE8800892-5 1988-03-11

Publications (1)

Publication Number Publication Date
WO1989008502A1 true WO1989008502A1 (fr) 1989-09-21

Family

ID=20371666

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000099 WO1989008502A1 (fr) 1988-03-11 1989-03-03 Separateur centrifuge

Country Status (2)

Country Link
SE (1) SE460707B (fr)
WO (1) WO1989008502A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1887476A (en) * 1929-09-28 1932-11-08 Laval Separator Co De Centrifugal separator
DE596797C (de) * 1929-01-03 1934-05-11 Harold William Fawcett Schleudertrommel mit an ihrem Umfang angeordneten, radial nach aussen fuehrenden Austrittsoeffnungen fuer die aus der Schleuderfluessigkeit ausgeschiedenen festen Bestandteile
US2599619A (en) * 1947-06-13 1952-06-10 Separator Ab Method and apparatus for centrifugal separation
DE1949876B2 (fr) * 1968-10-14 1980-02-28 Alfa-Laval Ab, Tumba (Schweden)
US4430071A (en) * 1982-05-27 1984-02-07 Dorr-Oliver Incorporated Feed seal for bottom feed centrifuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596797C (de) * 1929-01-03 1934-05-11 Harold William Fawcett Schleudertrommel mit an ihrem Umfang angeordneten, radial nach aussen fuehrenden Austrittsoeffnungen fuer die aus der Schleuderfluessigkeit ausgeschiedenen festen Bestandteile
US1887476A (en) * 1929-09-28 1932-11-08 Laval Separator Co De Centrifugal separator
US2599619A (en) * 1947-06-13 1952-06-10 Separator Ab Method and apparatus for centrifugal separation
DE1949876B2 (fr) * 1968-10-14 1980-02-28 Alfa-Laval Ab, Tumba (Schweden)
US4430071A (en) * 1982-05-27 1984-02-07 Dorr-Oliver Incorporated Feed seal for bottom feed centrifuge

Also Published As

Publication number Publication date
SE8800892L (sv) 1989-09-12
SE460707B (sv) 1989-11-13
SE8800892D0 (sv) 1988-03-11

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