EP0140672A2 - Décanteuses centrifuges - Google Patents

Décanteuses centrifuges Download PDF

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Publication number
EP0140672A2
EP0140672A2 EP84307277A EP84307277A EP0140672A2 EP 0140672 A2 EP0140672 A2 EP 0140672A2 EP 84307277 A EP84307277 A EP 84307277A EP 84307277 A EP84307277 A EP 84307277A EP 0140672 A2 EP0140672 A2 EP 0140672A2
Authority
EP
European Patent Office
Prior art keywords
bowl
liquid
solids
carrier liquid
cylindrical portion
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Withdrawn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
EP84307277A
Other languages
German (de)
English (en)
Other versions
EP0140672A3 (en
Inventor
Geoffrey Luther Grimwood
John Wright
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.)
Thomas Broadbent and Sons Ltd
Original Assignee
Thomas Broadbent and Sons 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 Thomas Broadbent and Sons Ltd filed Critical Thomas Broadbent and Sons Ltd
Publication of EP0140672A2 publication Critical patent/EP0140672A2/fr
Publication of EP0140672A3 publication Critical patent/EP0140672A3/en
Withdrawn legal-status Critical Current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
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/04—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • 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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • 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
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2041—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with baffles, plates, vanes or discs attached to the conveying screw
    • 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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the contamination of the solids can be reduced by applying a wash liquid to the solids as they leave the carrier liquid. This is relatively ineffective, the wash liquid to solids contact time being short, the wash liquid being lost in the centrate and solids tending to be washed back into the carrier liquid.
  • a further liquid is introduced into the-bowl which is both immiscible with and of higher specific gravity than the carrier liquid to establish at the periphery of the bowl a body of this further liquid defining a transfer zone disposed radially outwardly of the body of carrier liquid, the solids -separated from the carrier liquid by centrifugal action moving into said transfer zone where carrier liquid adhering to the solids particles is displaced by the second liquid of higher specific gravity, the solids particles being scrolled through said transfer zone to the solids outlet of the bowl.
  • means are provided adjacent the solids discharge end of the bowl for isolating the body of carrier liquid from the frusto-conical portion of the bowl, so that when the solids are scrolled from the transfer zone up the frusto-conical portion of the bowl to the solids discharge outlet, they are not re-contaminated by carrier liquid.
  • the latter means comprises a disc carried by the-conveyor and disposed adjacent the solids discharge end of the bowl, the outside diameter of-said - disc being such that it extends into said body of further liquid and the inside diameter being such that it extends radially inwardly of the radially inner surface of said body of carrier liquid.
  • the centrifuge of Fig. 1 comprises essentially a solid bowl 10 which is adapted to be rotated about a horizontal axis 12 by drive means (not shown).
  • the bowl 10 has a radial end wall 14, a cylindrical side wall portion 16 and a frusto-conical side wall portion 18.
  • a helical screw conveyor 20 Coaxially mounted within the bowl, for rotation at a slightly different speed thereto, is a helical screw conveyor 20 which is adapted to scroll solids deposited on the inner periphery of the bowl towards a solids discharge outlet 22 dispersed downstream of the frusto-conical portion 18 in the conveying direction.
  • the radial wall 14 at the other end of the bowl contains a liquid discharge orifice 24.
  • Liquid slurry to be separated is introduced into the interior of the bowl by way of a feed pipe 26 and apertures 28 in the conveyor 20.
  • the bowl of Fig. 2 is similar to that of Fig. 1 except that it contains a cylindrical screen portion 30 between the frusto-conical portion and the solid discharge outlet 22.
  • Both of these decanting centrifuges subject the slurry to be separated to high radial acceleration or 'G' forces, thus separating the heavier solids 32 (which are moved to the periphery of the bowl by this 'G' force to be scrolled by the conveyor 20 to the solids discharge outlet 22) from the lighter carrier liquid that flows to the liquid outlet 24.
  • the present "state of the art” washing is applied by the wash feed pipe 34 to deliver wash liquid via outlet pipes 38a to the solids being scrolled across the screen 30, the contaminated wash liquid being collected in the screen section 40a of the outer casing-40.
  • wash liquid 42 which is of a higher specific gravity than the carrier liquid and immiscible therewith, is introduced via the wash feed pipe 34 through wash inflow pipes 44 and, under the resulting 'G' force, fills the bowl until excess wash liquid flows from the liquid outlet 24 (or is removed by a rotating collector trough and skimmer pipe, or other known means).
  • wash zone 46 is established at the periphery of the bowl.
  • a radial separating disc 52 rigidly mouted to the conveyor trunnion for rotation therewith, has an outside diameter greater than the diameter of the bore of-the cylindrical bowl portion 16 minus Y, and an inner diameter less than the bore diameter of the cylindrical bowl-portion minus (X + Y), in order to maintain the separation of the wash liquid and centrate at the liquid discharge end of the bowl.
  • the wash liquid zone level- is maintained by providing the required flow of wash liquid to the wash feed pipe 34 - the supply being either fresh wash liquid or wash liquid re-circulated (by tank, pump or similar known means) from used overflow wash liquid recovered from a wash section of the casing - or a combination of both.
  • This embodiment of the invention has the disadvantage that the solids pass briefly through the carrier liquid (slurry) zone 48 again as they are scrolled through the conical bowl-section 18 to the solids discharge outlet 22 and some re-contamination by the carrier liquid can therefore occur. Tests show, however, that this level of re-contamination is low and a substantial improvement in washing occurs by this method - which is added to the advantages that the wash liquid does not mix with the carrier liquid, is not lost to the centrate and can be re-circulated and re-used.
  • Fig. 4 shows a preferred embodiment in accordance with this invention that overcomes the disadvantage of re-contamination of the solids which can happen with the embodiment of Fig. 3.
  • a second liquid separating disc 54 again rigidly attached to the conveyor 20, is fitted near to-the solids discharge end of the centrifuge.
  • the disc 54 is dimensioned so that its outside diameter is greater than the diameter of the interface between the wash and carrier liquids in the bowl end and its inner diameter is less than the diameter of the free surface of rotation of the carrier liquid. Wash liquid is introduced during start-up via the wash input pipes 44 to the final wash zone 46a near the solids discharge end of the centrifuge as described above, to establish the washing zones 46 and 46a.
  • the slurry passes via a feed pipe 26 and feed port-28 to the bowl near the liquid discharge end of the centrifuge, with the carrier liquid flowing (left to right) towards the solids discharge end con-currently with the scrolling of the solids in the same direction by the conveyor - 20.
  • the centrate returns (right to left) via axial channels 60 to discharge via the liquid outlet 24.
  • a separating disc 62 separates the centrate from the slurry zone 64.
  • the present invention is applicable also to this type of con-current flow centrifuge and overcomes the disadvantages of the present known methods of washing.
  • Fig. 6 shows one embodiment in accordance with this invention applied to a con-current flow decanting centrifuge.
  • separating discs 52 and 54 are fitted near the liquid discharge and solids discharge ends of the decanter and are fixed to the conveyor 20 to define the wash zone 46 and to isolate the final wash zone 46a from the slurry zone 48.
  • a containment disc 66 is fitted to the bowl to provide compartments for the wash liquid 42 and centrate, the former discharging from the wash liquids outlet pipes-68 and the latter from the liquid outlet 24 (the liquid-outlets now having opposite roles to those shown in Fig. 4).
  • One application for this invention is the washing of cuttings from oil and gas wells, particularly those drilled with oil based drilling fluids.
  • the disposal of oil wet cuttings represents a loss of oil and an environmental hazard (particularly offshore).
  • the removal of the surplus oil on the surface of the cuttings and the replacement-of this by-a wash liquid is both economic and environmentally sound.

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  • Centrifugal Separators (AREA)
  • Photoreceptors In Electrophotography (AREA)
EP84307277A 1983-10-28 1984-10-23 Improvements in decanting type centrifuges Withdrawn EP0140672A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8328894 1983-10-28
GB838328894A GB8328894D0 (en) 1983-10-28 1983-10-28 Decanting type centrifuges

Publications (2)

Publication Number Publication Date
EP0140672A2 true EP0140672A2 (fr) 1985-05-08
EP0140672A3 EP0140672A3 (en) 1985-10-23

Family

ID=10550899

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84307277A Withdrawn EP0140672A3 (en) 1983-10-28 1984-10-23 Improvements in decanting type centrifuges

Country Status (4)

Country Link
EP (1) EP0140672A3 (fr)
JP (1) JPS60110353A (fr)
GB (2) GB8328894D0 (fr)
NO (1) NO844285L (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405125A3 (en) * 1989-06-29 1991-04-17 Kloeckner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for the post-treatment of heavy phase material in the heavy phase discharge zone of a screw decanter
EP0488086A3 (en) * 1990-11-27 1992-08-26 Tsukishima Kikai Co. Ltd. Decanter centrifuge
EP0574364A1 (fr) * 1992-06-11 1993-12-15 RAPANELLI FIORAVANTE S.p.A. Centrifugeuse pour la séparation d'huile de suspensions huileuses, travaillant sans addition d'eau potable
ES2065839A2 (es) * 1992-04-24 1995-02-16 Nuova Maip Macchine Agric Dispositivo de regulacion del nivel de salida de componentes liquidos de productos en separadores centrifugos y metodo de separacion.
WO1996000129A1 (fr) * 1994-06-27 1996-01-04 Amoco Corporation Configuration de conduite de lavage dans une centrifugeuse a vis
EP0704248A1 (fr) * 1994-09-29 1996-04-03 Nuova M.A.I.P., Macchine Agricole Industriali Pieralisi S.P.A. Procédé et dispositif pour l'extraction centrifuge d'huile de premier et second pressages
EP0785029A1 (fr) * 1996-01-18 1997-07-23 RAPANELLI FIORAVANTE S.p.A. Centrifugeuse horizontale pour l'extraction optimale d'huile
ES2116857A1 (es) * 1993-10-22 1998-07-16 Alfa Laval Spa Aparato para separar una o dos fases fluidas de una fase solida, en particular para separar agua de vegetacion y aceite de residuos.
EP0746414B1 (fr) * 1994-02-23 1998-11-04 Swift-Eckrich, Inc. procede permettant de degraisser des viandes
WO2025147745A1 (fr) * 2024-01-11 2025-07-17 Alcoa Of Australia Limited Manipulation de matériaux

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6572524B1 (en) * 2000-07-14 2003-06-03 Alfa Laval Inc. Decanter centrifuge having a heavy phase solids baffle
WO2015154181A1 (fr) * 2014-04-07 2015-10-15 Kayden Industries Limited Partnership Procédé et système de récupération de matériau de lestage et fabrication d'un fluide de forage lesté
JP6795605B2 (ja) * 2016-10-06 2020-12-02 株式会社Ｉｈｉ回転機械エンジニアリング 固液分離方法および固液分離システム

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB708590A (en) * 1951-05-16 1954-05-05 Separator Ab Improvements in or relating to the elimination of solid materials from oils
GB726596A (en) * 1952-05-14 1955-03-23 Separator Ab Improvements in or relating to centrifuges for separating, sludge containing liquids
FR1067028A (fr) * 1952-06-26 1954-06-11 Procédé et dispositif de machine centrifugeuse pour extraire, filtrer, séparer, assécher les liquides et les solides
US3228594A (en) * 1965-02-05 1966-01-11 Clifford L Amero Centrifugal separator
DE1918130C3 (de) * 1968-04-18 1980-06-12 Mario De Dr.-Ing. Genua Martini (Italien) Vollmantel-Schneckenzentrifuge
US3623656A (en) * 1970-01-30 1971-11-30 Pennwalt Corp Three-phase centrifuge
GB1391059A (en) * 1971-04-28 1975-04-16 Ici Ltd Process and apparatus for separating solids from slurries
DE2901607C2 (de) * 1979-01-17 1981-03-12 Westfalia Separator Ag, 4740 Oelde Vollmantelschneckenzentrifuge
GB2083381B (en) * 1980-09-09 1983-08-17 Alfa Laval Separation As Uniflow decanter centrifuge
DE3202294C1 (de) * 1982-01-26 1983-04-21 Westfalia Separator Ag, 4740 Oelde Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0405125A3 (en) * 1989-06-29 1991-04-17 Kloeckner-Humboldt-Deutz Aktiengesellschaft Method and apparatus for the post-treatment of heavy phase material in the heavy phase discharge zone of a screw decanter
EP0488086A3 (en) * 1990-11-27 1992-08-26 Tsukishima Kikai Co. Ltd. Decanter centrifuge
US5306225A (en) * 1990-11-27 1994-04-26 Tsukishima Kikai Co., Ltd. Decanter centrifuge having a disc-like dip weir with a hole
ES2065839A2 (es) * 1992-04-24 1995-02-16 Nuova Maip Macchine Agric Dispositivo de regulacion del nivel de salida de componentes liquidos de productos en separadores centrifugos y metodo de separacion.
EP0574364A1 (fr) * 1992-06-11 1993-12-15 RAPANELLI FIORAVANTE S.p.A. Centrifugeuse pour la séparation d'huile de suspensions huileuses, travaillant sans addition d'eau potable
ES2116857A1 (es) * 1993-10-22 1998-07-16 Alfa Laval Spa Aparato para separar una o dos fases fluidas de una fase solida, en particular para separar agua de vegetacion y aceite de residuos.
EP0746414B1 (fr) * 1994-02-23 1998-11-04 Swift-Eckrich, Inc. procede permettant de degraisser des viandes
WO1996000129A1 (fr) * 1994-06-27 1996-01-04 Amoco Corporation Configuration de conduite de lavage dans une centrifugeuse a vis
EP0704248A1 (fr) * 1994-09-29 1996-04-03 Nuova M.A.I.P., Macchine Agricole Industriali Pieralisi S.P.A. Procédé et dispositif pour l'extraction centrifuge d'huile de premier et second pressages
EP0785029A1 (fr) * 1996-01-18 1997-07-23 RAPANELLI FIORAVANTE S.p.A. Centrifugeuse horizontale pour l'extraction optimale d'huile
WO2025147745A1 (fr) * 2024-01-11 2025-07-17 Alcoa Of Australia Limited Manipulation de matériaux

Also Published As

Publication number Publication date
GB2148750A (en) 1985-06-05
GB8328894D0 (en) 1983-11-30
GB8426815D0 (en) 1984-11-28
NO844285L (no) 1985-04-29
JPS60110353A (ja) 1985-06-15
EP0140672A3 (en) 1985-10-23

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Inventor name: GRIMWOOD, GEOFFREY LUTHER

Inventor name: WRIGHT, JOHN