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WO1988002664A1 - Separateur centrifuge pourvu d'un organe d'evacuation fixe - Google Patents

Separateur centrifuge pourvu d'un organe d'evacuation fixe Download PDF

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Publication number
WO1988002664A1
WO1988002664A1 PCT/SE1987/000471 SE8700471W WO8802664A1 WO 1988002664 A1 WO1988002664 A1 WO 1988002664A1 SE 8700471 W SE8700471 W SE 8700471W WO 8802664 A1 WO8802664 A1 WO 8802664A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
inlet opening
rotor
centrifugal separator
liquid
Prior art date
Application number
PCT/SE1987/000471
Other languages
English (en)
Inventor
Jon Eiken
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 WO1988002664A1 publication Critical patent/WO1988002664A1/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

Definitions

  • the present invention concerns a centrifugal separator having a rotor with a separation chamber and with a discharge chamber for a liquid separated in the separation chamber.
  • the centrifugal separator also has a stationary discharge member comprising an essentially circular disc being arranged coaxially with the rotor in the discharge chamber and having a peripheral inlet and a central outlet.
  • the inlet is formed by at least one projection projecting radially out from the periphery of the disc and having an inlet opening directed tangentially in a direction opposite to the rotational direction of the rotor and an inlet channel connecting the inlet opening to an internal space in the disc.
  • Liquid separated during operation and present in the discharge chamber forms a rotating liquid body having a liquid surface directed radially inwards, and means are arranged to keep this liquid surface during operation at a predetermined radial level outside the circular part of the discharge member.
  • Centrifugal separators of this kind are used for many different purposes.
  • One advantage with the same is that the described outlet device for a separated component forms a centripetal pump, which makes it possible to transport the discharged component in tubes connected to the stationary discharge member without use of separate pump devices.
  • a separation process in which a separated component has a very high viscosity, can be found in connection with the refinery of vegetabilic oils containing fatty acids.
  • the fatty acids are neutralized by mixing natrium hydroxide and water into the oil to be neutralized, the natrium hydroxide reacting with the fatty acids and forming a soap mass.
  • This soup mass which normally is separated from the neutralized vegetabilic oil in centrifugal separators, has a very high flow resistance, and a large effect is needed just for the discharge of the soap mass out of the centrifugal separator.
  • the object of the present invention is to provide a centrifugal separator of the initially described kind, in which the problem discussed above concerning a great consumption of effect can be reduced.
  • This object may be achieved by designing the space within said circular disc, which constitutes a part of the stationary outlet member of the centrifugal separator, ring shaped such that it encloses the rotational axis of the rotor and extends radially essentially from the centre of the disc to the outer periphery of the disc.
  • paring discs of the type here in question said space within the disc is divided into separate channels, each of which usually extends spirally from the periphery of the disc to the centre of it and the central outlet located there.
  • the disc at said inlet opening is provided with a radially inner edge and a radially outer sharp edge, only the latter of which is situated at such a radial level that during operation it is immersed into the liquid body in the discharge chamber of the rotor.
  • the consumption of effect is reduced at the entrance of the separated liquid in the channel.
  • Fig. 1 schematically shows an axial section through a part of a centrifugal separator according to the invention
  • Fig. 2 shows a section along the line II-II in figure 1
  • Fig. 3 shows in section an enlarged part of the centrifugal separator in fig 1
  • Fig. 4a, b and c shows axial sections along the line IV-IV through three alternative embodiments of the part shown in figure 3 of the centrifugal separator.
  • FIG 1 there is shown a part of a centrifugal separator comprising a rotor, which has a lower part 1 and an upper part 2, which are joint together axially by means of a locking ring 3.
  • a valve slide 4 arranged inside the rotor.
  • This valve slide delimits together with the upper part 2 a separation chamber 5 and is arranged to open and close an upper passage towards the outlet openings 6 for a component, which has been separated from a mixture supplied to the rotor and been accumulated at the periphery of the separation chamber 5.
  • the valve slide 4 delimits together with the lower part 1 a closing chamber 7, which is provided with an inlet 8 and a throttled outlet 9 for a so called closing liquid.
  • the valve slide 4 Upon rotation of the rotor the valve slide 4 is pressed by the pressure from the closing liquid present in the closing chamber 7 by the influence of the centrifugal force into sealing abutment against an annular gasket 10 arranged in the upper part 2.
  • a stack of discs 11 comprising a number of conical separating discs between a distributor 12 and an upper disc 13.
  • the rotor is mounted on a hollow shaft, through which the liquid mixture, which is to be centrifugally treated, can be supplied to the separation chamber 5.
  • the upper disc forms at its in the figure shown upper end a centrally located first discharge chamber 15 for a specific lighter liquid component separated in the separating chamber 5.
  • This first discharge chamber 15 is in connection with the separation chamber 5 via a first overflow outlet 16, over which the specific lighter component can flow out of the separation chamber 5.
  • the upper part 2 of the rotor forms a centrally located second discharge chamber 17, to which a specific heavier separated liquid component can flow out of the radially outermost part of the separation chamber 5 via a passage 18 and a second overflow outlet 19.
  • each discharge chamber there is arranged a stationary outlet member, a first discharge member 20 and a second discharge member 21, respectively.
  • These discharge members are formed as circular discs provided with peripheral inlets, a first inlet 22 and a second inlet 23, which are connected to central outlets, a first outlet 24 and a second outlet 25, respectively.
  • the discharge members 20, 21 extend essentially perpendicularly to the axis of rotation radially so far out that they during operation partly are located in a rotating liquid body present in the discharge chamber 15j 17, respectively.
  • the second discharge member 21 has a projection 26 projecting radially out of the periphery of the disc (fig. 2), in which a second inlet 23 is arranged with an inlet opening directed towards the rotational direction of the rotor.
  • the discharge chamber 17 is provided with internal wings 28 directed radially inwards for the entrainment of the liquid present in the discharge chamber.
  • the design of the projection 26 can be seen in figure 3, which shows an enlarged section through the same.
  • the projection 26 forms an inlet opening 29 directed towards the rotational direction of the rotor and an inlet channel 30, which connects the inlet opening 29 to the space 27 of the disc 21.
  • the inlet opening 29 is delimited by a radially inner edge 31, which is parallel to the axis of rotation of the rotor and during operation is located radially inside the liquid body rotating in the discharge chamber 17, and a radially outer sharp edge 32 located radially outside this liquid surface and consequently it is immersed into the liquid body.
  • the form of the outer edge 32 is then preferably arcuated or designed such that it together with the inner edge forms a triangle or a rectangle.
  • the radius of the circular disc increases in the rotational direction of the rotor.
  • the circumferential surface of the circular disc can be planned or arcuated in this circular sector 33.
  • the projection 34 is designed in a second circular sector with a radius which decreases from the inlet opening in the rotational direction of the rotor.
  • centrifugal separator according to the invention shown in the figures functions in the following manner:
  • the separation chamber 5 In connection with starting of a centrifugal separator of this kind and bringing the rotor to rotate, the separation chamber 5 is closed by supplying closing liquid to the closing chamber 7 through the inlet 8. As soon as the separation chamber 5 is closed, the liquid mixture, which is to be centrifugally treated, is supplied to the separation chamber through the hollow shaft 14. When the rotor has reached the rotational speed of operation and the separation chamber 5 has been filled up, the components contained in the liquid mixture are separated by the influence of centrifugal forces acting on the same. The separation is then mainly taking place in the intermediate spaces between the conical discs in the disc stack 11. During separation a specific heavier liquid component is thrown radially out towards the periphery of the separation chamber 5 where it is accumulated, while a specific lighter liquid component flows radially inwards in these intermediate spaces.
  • centrifugally treated liquid mixture also contains specific heavy particles, these are accumulated at the outermost periphery of the separation chamber 5.
  • the specific lighter liquid component flows over to the first discharge chamber 15 via the overflow outlet 16, which thereby will be determining for the radial level of the free liquid surface in the separation chamber 5.
  • the light liquid component is discharged under pressure out of the centrifugal rotor via the stationary discharge member 20, which in this case consists of a conventional paring disc.
  • the specific heavier liquid component which has been accumulated at the periphery of the separation chamber, flows radially inwards through the passage 8 and further via the overflow outlet 19 into the outlet chamber 17.
  • it forms a cylindrical liquid body, which is kept In rotation inter alia by means of the entraining means 28 (fig. 2).
  • the discharge member 21 is immersed into the rotating liquid body only with its radially projecting projection 26, while the circular disc of the discharge member is located ra ⁇ dially inside the rotating liquid body.
  • the friction between the outside of the discharge member 21 and the rotating liquid body will be low.
  • the space 27 is designed such that it encloses the rotational axis of the rotor and extends radially from the centre outlet 25 to the radially outermost part of the circular disc.
  • the specific heavier component is permitted to choose by itself the flow path through the discharge member 21 between the inlet channel 30 and the central outlet 25. This seems to result in the lowest possible flow resistance for the discharge of the heavy liquid component.
  • the free liquid surface of the liquid body in the discharge chamber 17 can take a form, which differs from the pure circular cylindrical.
  • the radius of the circumferential surface of the circular disc increases in the rotational direction of the liquid body in a circular sector upstream the inlet opening 29.
  • the discharge capacity of the inlet opening 29 can be used maximally without any risk for the circular disc coming into contact with the liquid body.
  • the projection suitably has such a form that it behind the inlet opening 29 extends in the rotational direction of the rotor along a circular sector which is less than 45°, and its outer radius being decreasing successively behind the inlet opening 29.
  • the rotating liquid body leaves the projection close to the inlet opening 29.
  • the projection with a sharp edge (not shown) located in the rotational direction of the liquid body after the inlet opening 29, from which the liquid body leaves the projection 26.
  • an interface between the specific lighter and the specific heavier liquid component in the separation chamber is adjusted during operation, the radial position of which Is determined inter alia by the position of the two overflow outlets 16 and 19.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

Séparateur centrifuge comprenant un rotor avec une chambre de séparation (5) et une chambre d'évacuation (17) pour l'évacuation d'un liquide séparé dans la chambre de séparation. La séparation centrifuge comprend également un organe d'évacuation fixe en forme de disque circulaire pourvu d'une admission périphérique (23) et d'une évacuation centrale (25), disposé dans la chambre d'évacuation (17) et coaxial avec le rotor. L'admission (23) est formée par au moins une saillie se projetant depuis la périphérie du disque et présentant un orifice d'admission orienté de façon essentiellement tangentielle dans la direction opposée à la rotation du rotor, et un canal d'admission (30) reliant l'orifice d'admission (29) à un espace pratiqué dans le disque. Le liquide séparé présent dans la chambre d'évacuation (17) forme un corps liquide en rotation qui présente une surface liquide radialement vers l'intérieur, ce corps liquide étant maintenu à un niveau radial prédéterminé à l'extérieur du disque circulaire. L'espace (27) pratiqué à l'intérieur du disque circulaire a la forme d'un anneau, entoure l'axe de rotation du rotor et s'étend radialement depuis l'évacuation centrale du disque vers la circonférence externe du disque.
PCT/SE1987/000471 1986-10-15 1987-10-15 Separateur centrifuge pourvu d'un organe d'evacuation fixe WO1988002664A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8604366A SE454954B (sv) 1986-10-15 1986-10-15 Centrifugalseparator innefattande ett i utmatningskammaren anordnat stationert utmatningsorgan i form av en huvudsakligen cirkuler skiva
SE8604366-8 1986-10-15

Publications (1)

Publication Number Publication Date
WO1988002664A1 true WO1988002664A1 (fr) 1988-04-21

Family

ID=20365926

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000471 WO1988002664A1 (fr) 1986-10-15 1987-10-15 Separateur centrifuge pourvu d'un organe d'evacuation fixe

Country Status (2)

Country Link
SE (1) SE454954B (fr)
WO (1) WO1988002664A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007983A1 (fr) * 1989-01-13 1990-07-26 Alfa-Laval Separation Ab Separateur centrifuge pourvu d'un dispositif servant a la transformation de l'energie cinetique en energie de pression
WO1994006565A1 (fr) * 1992-09-21 1994-03-31 Alfa Laval Separation Ab Separateur centrifuge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE529611C2 (sv) 2006-02-13 2007-10-02 Alfa Laval Corp Ab Centrifugalseparator
SE529609C2 (sv) 2006-02-13 2007-10-02 Alfa Laval Corp Ab Centrifugalseparator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE88047C1 (fr) *
GB494211A (en) * 1936-12-10 1938-10-21 Separator Ab Improvements in paring or skimming devices for centrifugal separators

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE88047C1 (fr) *
GB494211A (en) * 1936-12-10 1938-10-21 Separator Ab Improvements in paring or skimming devices for centrifugal separators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990007983A1 (fr) * 1989-01-13 1990-07-26 Alfa-Laval Separation Ab Separateur centrifuge pourvu d'un dispositif servant a la transformation de l'energie cinetique en energie de pression
US5160311A (en) * 1989-01-13 1992-11-03 Alfa-Laval Separation Ab Centrifugal separator having a device for the transformation of kinetic energy to pressure energy
WO1994006565A1 (fr) * 1992-09-21 1994-03-31 Alfa Laval Separation Ab Separateur centrifuge
US5405307A (en) * 1992-09-21 1995-04-11 Alfa Laval Separation Ab Centrifugal separator with a paring device

Also Published As

Publication number Publication date
SE8604366D0 (sv) 1986-10-15
SE8604366L (sv) 1988-04-16
SE454954B (sv) 1988-06-13

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