[go: up one dir, main page]

WO2001051165A1 - Decanteur pour separer deux phases liquides de densite differente - Google Patents

Decanteur pour separer deux phases liquides de densite differente Download PDF

Info

Publication number
WO2001051165A1
WO2001051165A1 PCT/EP2000/013081 EP0013081W WO0151165A1 WO 2001051165 A1 WO2001051165 A1 WO 2001051165A1 EP 0013081 W EP0013081 W EP 0013081W WO 0151165 A1 WO0151165 A1 WO 0151165A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
decanter
intermediate layer
screw
conveying
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.)
Ceased
Application number
PCT/EP2000/013081
Other languages
German (de)
English (en)
Inventor
Rainer Frische
Bernd Best
Karlheinz Brunner
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.)
Dr Frische GmbH
Original Assignee
Dr Frische GmbH
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 Dr Frische GmbH filed Critical Dr Frische GmbH
Priority to AU2001228431A priority Critical patent/AU2001228431A1/en
Publication of WO2001051165A1 publication Critical patent/WO2001051165A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B04B1/20—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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0217—Separation of non-miscible liquids by centrifugal force
    • 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
    • B04B2001/205—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 special construction of screw thread, e.g. segments, height

Definitions

  • Two-phase separating decanters are able to separate immiscible liquids, which have different densities, into a light phase and a heavy phase and to continuously discharge them separately. If the liquid mixture to be separated contains finely divided solids, these can be separated off and discharged together with one of the two phases. Three-phase decanters are also capable of this, although they separate the separated solids.
  • Two-phase and three-phase decanters have been proposed for a wide variety of uses and in a wide variety of designs, with two-phase decanters being used in many cases not for liquid-liquid separation, but as standard for liquid-solid separation.
  • a beam deflector prevents the suspension to be separated from being fed into the discharge channels for the heavy liquid phase located on the same decanter side.
  • a typical example of the use of two-phase decanters is the extraction of olive oil from finely ground olives.
  • the aqueous olive pulp is separated into a pure oil phase as the light phase and an amniotic fluid phase containing solid particles as the heavier phase.
  • the decanter continuously carries out these two phases separately.
  • a two-phase decanter contains a screw conveyor with a screw body 2 as the conveying element. According to the schematic representation in FIG. 1, this is arranged within a centrifuge drum 1 or a centrifugal cylinder.
  • the screw conveyor has a slightly higher speed than the drum, so that it exerts a conveying effect corresponding to its direction of rotation.
  • An equivalent alternative measure to this is to design the screw conveyor for an opposite conveying direction and to run it at a slightly lower speed than that of the drum.
  • a so-called immersion disk 3 is attached to the screw conveyor between the entry point E of the undivided pulp and the exit point of the heavy, solid-containing liquid phase.
  • This immersion disk 3 is mounted radially and tightly on the screw body 2.
  • the diameter of the disc 3 is dimensioned such that the heavy phase W containing deoiled solids F, as required by the screw, can pass through the annular gap between the immersion disc 3 and the centrifuge drum 1, but not the light, floating inside, in the centrifugal field Olphase O.
  • weirs 4, 5 essentially represent perforated disk closures of the centrifuge drum 1, the opening diameter of the oil weir 5 being a few Is set millimeter narrower than that of weir 4 for the difficult phase.
  • a higher liquid level is established on the above-mentioned immersion disk 3 on the oil side than on the water side.
  • the operation of the decanter can be set so that the separation zone between the heavy phase and the light phase has a smaller radius than the immersion disk 3.
  • the heavy phase (water phase) containing solids flows through under the immersion disk, whereas the light phase (oil phase) accumulates on the immersion disk.
  • Oil floating during operation and separating as a light phase then flows in the direction of the oil weir 5 against the direction of conveyance of the screw and exits through it.
  • the direction of conveyance of the screw for the solid is indicated here by the screw spirals 2a, which are only indicated schematically.
  • Westfalia Separator AG offers two-phase decanters, which are basically constructed as shown schematically in FIG. 1 (type designations CA 226, CA 366, CA 450 and CA 505). These decanters are designed as decanters with a generally horizontal drum. However, there are also decanters that work, for example, with the drum standing vertically, whereby, due to the high speeds, the conditions in centrifugal operation do not differ from those with the drum standing horizontally or at an angle. In the meantime, numerous different screw shapes and enema agents have been implemented for the porridge which has not yet been separated.
  • an inlet pipe 6, felt by the screw body 2, with a downstream distributor (not shown) attached to the screw body 2 is provided as an example of a possible embodiment of the inlet means.
  • the inlet means or the inlet means can also include inlet tube parts protruding into the space between the spiral flights of the screw.
  • the present invention can be applied to other implementations, as will become apparent to those skilled in the art from the following description.
  • the oil loss occurs due to the fact that on the drum wall centrifugally separated solids capture oil which can be spun off and this oil and the solids get through the screw conveyor under the plunger 3 into the discharge zone of the deoiled mass.
  • a common countermeasure against this oil loss is to remove the spun off solids in the de-oiled zone of the decanter, e.g. B. by a special shape of the screw conveyor, to circulate and so at least parts of the release closed oil. In a number of cases, such measures have also significantly improved the oil yield.
  • DE-PS 933 380 also acts mechanically on the separated solid.
  • This document describes a special centrifuge equipped with a set of plates in its inner separation space.
  • the concentrically perforated drum carries on its outer wall differently shaped and aligned blades which extend into the sludge from separated solids moving through the drum holes and process them and request them towards the sludge discharge point.
  • a decanter i.e. a solid-bowl screw centrifuge with continuous solids discharge, which separates two liquid phases from a starting mixture which may contain solids and in which the quality and yield of the lighter phase floating in the centrifugal field can be further approximated or improved to the theoretically possible value.
  • the intermediate layer is created as shown in the example of an oil-containing pulp to be separated: If the oil-containing inflow to be separated is fed into the rotating cylinder drum of the decanter, solid and heavy aqueous phase migrate to the outer wall of the cylinder, while oil droplets float up and form the inside in the centrifuge drum lying oil phase. At least at times the mixed layer Z (FIG. 1) consisting of both phases is located between the deoiled water phase and the anhydrous oil phase.
  • this phase mixture apparently does not behave like a liquid, but rather like a slurry of solids, as the inventors determined.
  • One measure to suppress the indicated conveyance of the intermediate phase Z against the immersion disk is to change the screw helix in the area of the intermediate layer to be expected and thus not at all, or not only in the area of the spun off solid that lies further away. In this way, the screw spiral can be left out in the area of the intermediate phase Z and the conveying capacity on the intermediate layer can be reduced in this area.
  • the transfer of oil that can be thrown off under the immersion disk can, however, be significantly reduced in particular by the fact that internals are attached to the screw body in front of the immersion disk, the conveying elements of which act against the conveying direction of the screw helix and which are also narrowly limited in the expected separation zone area between the liquid heavy phase and liquid oil phase provide this output.
  • Such internals can not only be provided between the coils, but can also be installed in the mentioned recesses in the coil. According to a preferred embodiment, these internals are designed similar to turbine blades. Mechanical internals, which act specifically on the intermediate layer, also increase their dwell time in the centrifugal field, so that the separation result is also improved as a result.
  • the conveyor elements are arranged in a ring around the screw body. They are built in such a way that the light phase (oil) flowing against the screw conveyor can be discharged without disturbance.
  • the heavy (aqueous) phase flowing helically in the conveying direction of the screws is not impeded in its flow direction.
  • the outer radius of the internals according to the invention is preferably less than the outer radius of the immersion disk. It should at least be dimensioned in such a way that a flowable, heavy liquid (aqueous) zone is always present between it and the solid thrown off by the centrifuge and conveyed by the screw body.
  • such an installation can consist of a thin rod or tube which is fastened in the screw body and projects radially into the centrifuge drum, at the end of this tube or rod having an inclined metal plate as the wing element.
  • the wing element like the screw body, rotates in comparison to the centrifuge drum with the difference in speed between the drum and the screw body higher or lower speed.
  • Several of these blades can be radially attached to the screw body, forming one or more feed wheels around the screw body. Like the screw, they can also be installed in a spiral between the helix.
  • a starch-adhesive mixture is to be separated into the solid phase starch and a liquid phase in the form of a muddy corn adhesive layer.
  • This layer of sludge forms during the separation of the supplied starch-adhesive mixture as a phase of lower settling capacity and, due to its slow movement to the point of application, hinders the separation of the supplied mixture.
  • two band screws are used, of which the screw, which extends approximately to the drum wall, has two strands of opposite pitch. The starch is cleared out with one strand, the adhesive and water sludge with the other strand in the opposite direction.
  • the additional inner screw now only ensures that the mud layer is quicker to theirs Host location is moved than it would otherwise move to this host location.
  • the formation of the sludge layer is counteracted by its accelerated discharge.
  • the phase was separated into the specifically lighter oil phase and the heavy aqueous solid suspension without the use of the conveying elements after the usual optimized setting of the adjustable decanter weir disc.
  • the separated oil contained about 3 to 4% by volume of water that can be flung off and about 1% by volume of solid that could be flung off.
  • the de-oiled solid still contained small floating oil droplets at the decanter discharge. A large number of other oil droplets were also observed under the microscope, which represented the oil released and thus capable of being thrown off.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne un décanteur pour séparer deux phases liquides de densité différente à partir d'un mélange de départ contenant éventuellement des solides. Ledit décanteur comprend un conduit d'entrée (6) par lequel le mélange de départ est introduit dans la zone d'une vis sans fin (2), un disque plongeur (3) placé devant le point de sortie pour la phase liquide de la plus haute densité se trouvant radialement vers l'extérieur, un déversoir (4) monté en aval du disque plongeur, pour cette phase la plus lourde, et un autre déversoir (5) se trouvant au point de sortie de la phase la plus légère, c'est-à-dire présentant la densité la plus faible. Dans ou entre les spires (2a) de la vis sans fin (2), des moyens mécaniques (7, 8, 9, 10, 11) sont placés dans la zone d'une couche intermédiaire (Z) qui correspond à la couche de mélange de phases au niveau de la zone de séparation entre la phase liquide la plus légère et la phase liquide la plus lourde, dans le champ centrifuge. Ces moyens mécaniques sont placés au moins dans la zone de la couche intermédiaire (Z) se trouvant devant le disque plongeur et ils empêchent le passage du mélange de phase de la couche intermédiaire (Z) jusqu'à la zone située sous le disque plongeur (3).
PCT/EP2000/013081 2000-01-11 2000-12-21 Decanteur pour separer deux phases liquides de densite differente Ceased WO2001051165A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001228431A AU2001228431A1 (en) 2000-01-11 2000-12-21 Decanter for separating two liquid phases having different densities

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10000789A DE10000789A1 (de) 2000-01-11 2000-01-11 Zweiphasendekanter zum Trennen zweier flüssigr Phasen unterschiedlicher Dichte
DE10000789.9 2000-01-11

Publications (1)

Publication Number Publication Date
WO2001051165A1 true WO2001051165A1 (fr) 2001-07-19

Family

ID=7627154

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/013081 Ceased WO2001051165A1 (fr) 2000-01-11 2000-12-21 Decanteur pour separer deux phases liquides de densite differente

Country Status (3)

Country Link
AU (1) AU2001228431A1 (fr)
DE (1) DE10000789A1 (fr)
WO (1) WO2001051165A1 (fr)

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578456A (en) * 1946-07-31 1951-12-11 Centrifuge Mechanical Equipmen Centrifugal separator
DE913880C (de) * 1952-03-18 1954-06-21 Starcosa Maschinen Und Appbau Trennschleuder
DE933380C (de) * 1952-05-28 1955-09-22 Separator Ab Verfahren und Schleuder zur Trennung eines Gemisches von Feststoffen und zwei Fluessigkeiten
EP0015210A1 (fr) * 1979-02-23 1980-09-03 Pierre Laurent Saget Appareil perfectionné pour la séparation centrifuge d'au moins deux phases liquides et une phase sédimentaire d'un mélange
US4245777A (en) * 1979-08-30 1981-01-20 Pennwalt Corporation Centrifuge apparatus
US4361490A (en) * 1979-10-31 1982-11-30 Pierre Saget Process for centrifugal separation and apparatus for carrying it out, applicable to a mixture of phases of any states
DE3301099A1 (de) * 1983-01-14 1984-12-06 KHD Humboldt Wedag AG, 5000 Köln Vorrichtung zur entfeuchtung von schlamm im zentrifugalfeld einer vollmantel-zentrifuge
US4519907A (en) * 1983-12-19 1985-05-28 Rexnord Inc. Grit settling basin including vane pump
US5156751A (en) * 1991-03-29 1992-10-20 Miller Neal J Three stage centrifuge and method for separating water and solids from petroleum products
DE4119003A1 (de) * 1991-06-08 1992-12-10 Kloeckner Humboldt Deutz Ag Schneckenzentrifuge
EP0565268A2 (fr) * 1992-04-06 1993-10-13 Alfa Laval Separation Inc. Centrifugeur décanteur comportant des filets de vis discontinues dans sa partie conique de déchargement du bol
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
WO1997023295A1 (fr) * 1995-12-21 1997-07-03 Alfa Laval Separation Ab Centrifugeuse de decantation
EP0856360A2 (fr) * 1996-12-05 1998-08-05 Cornello Centrifughe S.r.l. Vis pour séparateur centrifuge de l'huile d'olive

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2257467A1 (de) * 1972-11-23 1974-05-30 Jaroslawzew Horizontalabsetzschleuder zur trennung von dreikomponentensystemen
JPS62152556A (ja) * 1985-12-27 1987-07-07 Kotobuki Tekkosho:Kk ダブルカントデカンタによる３相分離装置
DE4205885C1 (en) * 1992-02-26 1993-03-18 Bernard 4358 Haltern De Meinken System for sepg. oil slops or emulsions into water, petrol, oil and solids - in which slop oil is heated in circuit comprising heater, column and pump and slop oil from bottom of column is cooled and sepd. into clean oil phase and solid phase
DE4324770C2 (de) * 1992-07-23 1997-06-12 Peter Schmidt Vorrichtung zur Trennung von Flüssigkeitsgemischen
DE4420760C1 (de) * 1993-07-01 1995-05-11 Gerd Wurster Verfahren und Anlage zur Wiederaufarbeitung oder Aufkonzentration verbrauchter tensidhaltiger Eisenphosphatierbäder

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578456A (en) * 1946-07-31 1951-12-11 Centrifuge Mechanical Equipmen Centrifugal separator
DE913880C (de) * 1952-03-18 1954-06-21 Starcosa Maschinen Und Appbau Trennschleuder
DE933380C (de) * 1952-05-28 1955-09-22 Separator Ab Verfahren und Schleuder zur Trennung eines Gemisches von Feststoffen und zwei Fluessigkeiten
EP0015210A1 (fr) * 1979-02-23 1980-09-03 Pierre Laurent Saget Appareil perfectionné pour la séparation centrifuge d'au moins deux phases liquides et une phase sédimentaire d'un mélange
US4245777A (en) * 1979-08-30 1981-01-20 Pennwalt Corporation Centrifuge apparatus
US4361490A (en) * 1979-10-31 1982-11-30 Pierre Saget Process for centrifugal separation and apparatus for carrying it out, applicable to a mixture of phases of any states
DE3301099A1 (de) * 1983-01-14 1984-12-06 KHD Humboldt Wedag AG, 5000 Köln Vorrichtung zur entfeuchtung von schlamm im zentrifugalfeld einer vollmantel-zentrifuge
US4519907A (en) * 1983-12-19 1985-05-28 Rexnord Inc. Grit settling basin including vane pump
US5156751A (en) * 1991-03-29 1992-10-20 Miller Neal J Three stage centrifuge and method for separating water and solids from petroleum products
DE4119003A1 (de) * 1991-06-08 1992-12-10 Kloeckner Humboldt Deutz Ag Schneckenzentrifuge
US5310399A (en) * 1991-08-20 1994-05-10 Kotobuki Techrex Ltd. Sedimentation centrifuge containing screw conveyor with fins
EP0565268A2 (fr) * 1992-04-06 1993-10-13 Alfa Laval Separation Inc. Centrifugeur décanteur comportant des filets de vis discontinues dans sa partie conique de déchargement du bol
WO1997023295A1 (fr) * 1995-12-21 1997-07-03 Alfa Laval Separation Ab Centrifugeuse de decantation
EP0856360A2 (fr) * 1996-12-05 1998-08-05 Cornello Centrifughe S.r.l. Vis pour séparateur centrifuge de l'huile d'olive

Also Published As

Publication number Publication date
AU2001228431A1 (en) 2001-07-24
DE10000789A1 (de) 2001-07-12

Similar Documents

Publication Publication Date Title
DE754339C (de) Verfahren und Vorrichtung zum Entfernen von schweren Teilchen unter Fliehkraftwirkung aus einer Aufschwemmung, insbesondere von Zellstoff, Papierstoff u. dgl.
DE69328817T2 (de) Dekantierzentrifuge zur hochgradigen Eindickung
DE970982C (de) Zentrifugalseparator, vorzugsweise zum Trennen von zwei verschiedenen Arten von in einer Fluessigkeit suspendierten festen Bestandteilen voneinander
DE69315109T2 (de) Schneckenzentrifuge mit unterbrochenen Schneckenwendeln im konischen Austragsmantelteil
DE3202294C1 (de) Kontinuierlich arbeitender Vollmantel-Gegenstrom-Zentrifugalextraktor
DE2612696A1 (de) Vollmantel-dekantierzentrifuge
EP0018474A2 (fr) Centrifuge pour la séparation continue de mélanges liquide-particules solides
DE2103829A1 (de) Zentrifuge
EP1337343B1 (fr) Vis sans fin pour centrifugeuse a vis a bol plein et procede d'extraction d'huile au moyen d'une centrifugeuse a vis a bol plein
DE3414078A1 (de) Zentrifuge mit hoher kapazitaet
DE69811014T2 (de) Zentrifuge mit heftig bewegtem Feststoffkuchen
DE102019102623A1 (de) Verfahren zum Klären einer Suspension von Feststoffen
DE69704963T2 (de) Horizontale Zentrifuge für eine optimale Ölextraktion
DE3318793A1 (de) Vorrichtung zum entfeuchten von schlamm
EP1968749B1 (fr) Centrifugeuse a vis sans fin a bol plein
DE69307604T2 (de) Ohne Zugabe von Trinkwasser arbeitende Zentrifuge zum Abscheiden von Öl aus Ölschlämmen
DE1024438B (de) Verfahren zum Abscheiden von Feststoffen aus einer Fluessigkeit
DE3301099C2 (fr)
DE1076042B (de) Kontinuierlich arbeitende Vollmantel-Zentrifuge, insbesondere fuer die Staerketrennung
DE102018113135A1 (de) Vorrichtung zur Klärschlammentwässerung
DE60124554T2 (de) Zentrifugalabscheider
DE2208093A1 (de) Zentrifuge
EP1260273B1 (fr) Centrifugeuse à vis
EP0076476A2 (fr) Décanteur centrifuge
EP1383607B1 (fr) Centrifugeuse a vis a paroi pleine et procede d'extraction d'huile a l'aide d'une centrifugeuse a vis a paroi pleine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AU AZ BA BG BR CA CN CZ DZ EE GE HR HU ID IL IN JP KP KR LT LV MA MK MX NO NZ PL RO RU SI SK UA US VN YU ZA

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP