EP1901849B1 - Centrifugeuse a vis sans fin, a bol plein et a trois phases, et procede pour reguler le processus de separation - Google Patents

Centrifugeuse a vis sans fin, a bol plein et a trois phases, et procede pour reguler le processus de separation Download PDF

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Publication number
EP1901849B1
EP1901849B1 EP06754000.5A EP06754000A EP1901849B1 EP 1901849 B1 EP1901849 B1 EP 1901849B1 EP 06754000 A EP06754000 A EP 06754000A EP 1901849 B1 EP1901849 B1 EP 1901849B1
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EP
European Patent Office
Prior art keywords
drum
phase
skimmer
chamber
disk
Prior art date
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Active
Application number
EP06754000.5A
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German (de)
English (en)
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EP1901849A1 (fr
Inventor
Wolf-Diethard Sudhues
Tore Hartmann
Ulrich Horbach
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.)
GEA Mechanical Equipment GmbH
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GEA Mechanical Equipment GmbH
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Publication of EP1901849A1 publication Critical patent/EP1901849A1/fr
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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
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • 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
    • B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
    • 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 invention relates to a three-phase solid bowl screw centrifuge (three-phase decanter) according to the preamble of claim 1.
  • the prior art the DE 27 07 111 A1 , the US 3,623,656 , the WO 03/074185A1 , the DE 195 00 600 C1 , the DE 102 23 802 A1 , the DE 38 22 983 A1 , the WO 02/062483 A1 and the DE 26 17 692 Algenannt.
  • the US 3,623,656 shows a three-phase decanter, with the two liquid phases and a solid phase are derived from the drum.
  • the liquid outlets can be adjusted by a conversion of the machine when the machine stops.
  • the WO 03/074185A1 shows a three-phase decanter, with the two liquid phases and a solid phase are derived from the drum also. With a weir, the flow rate of the heavier liquid phase can be adjusted.
  • the DE 38 22 983 A1 shows a three-phase decanter, with the two liquid phases and a solid phase are derived from the drum also, wherein one liquid phase is discharged through a weir and the other through a paring disc.
  • the DE 195 00 600 C1 and the DE 102 23 802 A1 show two-phase decanter, in which the liquid is discharged from a chamber by means of a paring disc.
  • the WO 02/062483 A1 shows a method of operating a solid bowl centrifuge.
  • the DE 26 17 692 A1 discloses a solid bowl centrifuge with multiple disc paces made up of separator plates and multiple screw sections.
  • Conversion parts are generally available for adapting to the respective product properties or for adapting the process to the respective conditions in the case of three-phase separating decanters.
  • the invention has the object of reducing the design effort to create a slightly changed in itself product properties adaptable three-phase decanter.
  • the invention solves this problem by the subject matter of claim 1.
  • the separation zone can be easily moved in the drum, which also leads to a change in the liquid level.
  • One by changing the characteristics of the product otherwise actually Required conversion can be omitted by utilizing the given control range usually.
  • the design effort to create the annular chamber is low.
  • the annular chamber as means for changing the pressure in the annular chamber on a fluid line for supplying a fluid, in particular a gas in the annular chamber.
  • the overflow for the other phase can be realized by radial discharge pipes, which pass through the drum shell or lid.
  • This basic structure can be realized in particular in two variants: in one, the heavier liquid phase is diverted through the discharge tube and the lighter one through the paring disc and the other the lighter liquid phase through the discharge tube and the heavier one through the paring disc. Both variants allow a good control of the process, but lead to different control characteristics. It is also a method for operating a three-phase solid bowl screw centrifuge conceivable in which the regulation of the separation process in the drum in the simplest way by changing the pressure in the annular chamber as a control variable. This variant is preferred because a simple and good control of the separation process is possible.
  • the regulation of the separation process in the drum takes place as a controlled variable as a function of the concentration in the solid phase or in one or both of the liquid phases derived.
  • the invention is also particularly suitable for phase separation in the recovery of hydrometals such as e.g. Cobalt, nickel, copper.
  • the formation of emulsions in the extraction can not be avoided.
  • the extraction and the emulsion consist of three phases, an organic phase, aqueous phase and solids.
  • the open settling tanks of the extraction are susceptible to contamination from the air. These different dust concentrations lead to a density difference of the individual phases in the emulsion.
  • the decanter according to the invention provides a remedy.
  • the separation diameter within the decanter can be adjusted online by applying pressure to the annulus. This separates the emulsion cleanly into the three phases.
  • hydrometals such as e.g. Cobalt, nickel, copper thus offers considerable advantages.
  • Fig. 1 and 5 show parts of three-phase solid bowl screw centrifuges, which has a rotatably mounted (bearing 17) drum 1 - here with a horizontal axis of rotation - and arranged in the drum 1 rotatable screw 2 with a screw body 3, on which a rotating screw blade 4 is arranged.
  • the drum 1 and the screw 2 rotate at different speeds n, m about the same axis of rotation (at the diameter D 0 ).
  • a bearing 16 is arranged between drum 1 and screw body 3.
  • the second bearing of the screw is located on the solid side (not shown here).
  • both the drum 1 and the screw 2 e.g. conical.
  • a Feststoffaustrag 24 for the transported by the screw to this end of the drum 1 solid phase S is arranged, whereas two separable from each other in the centrifugal liquid phases LL and HL - a lighter and a heavier liquid phase - in the opposite cylindrical end of the drum 1, which is closed by a drum cover 5, are derived from the drum 1.
  • a baffle plate 18 may for example be arranged on the worm body 3 in the transition region to the tapering section.
  • An inlet pipe 19 here extends, for example, from the cylindrical end of the drum 1 into the drum 1. It opens into a distributor 20, via which the product is passed into the drum 1.
  • the drum cover 5 has a plurality of the drum cover axially penetrating openings or openings 21, 22. Preferably, between four and eight such openings on a circle of a predetermined diameter circumferentially distributed in the drum cover 5 are formed.
  • first openings 21 - A portion of these openings - hereinafter referred to as first openings 21 - is formed in the manner of one-sided closed recesses (or in the manner of blind holes) and serves to drain the heavier liquid phase HL and a portion of these openings - hereinafter referred to as second openings 22 - serves to discharge the lighter liquid phase LL.
  • the regions of the decanter 1 arranged downstream of the first and second openings are quasi "interchanged" or the separating rifle is located in front of the openings leading to the paring disc 9.
  • This discharge radius for the heavier phase HL is not variable during operation or during a running process, but it can be changed or set at a standstill of the drum 1 by exchanging the discharge tube 8 and the tube against one with a different length.
  • the derivative of the lighter liquid phase LL takes place after passing through the second openings 22 by means of a paring disc 9, which is arranged in a peel chamber 10 upstream of the drum shell, which connects axially to the drum interior and whose inner diameter is equal to or - preferably - smaller than that Inner diameter of the drum 1 in its cylindrical portion.
  • the light liquid phase LL is discharged through this peeling disk 9 and a subsequent discharge channel 23 from the drum.
  • the peeling disk 9 are connected to the interior of the drum - see also Figs. 2 and 3 - in the peeling chamber 10 axially upstream two regulating disks 11, 12 of the same inner diameter, which extend radially from outside to inside and between which a siphon disk 13 dives extends in the peeling chamber 10 from the inner periphery thereof to the outside and whose outer diameter is at a larger radius relative to the rotational axis D of the drum 1 than the inner diameter of the two Regulierusionn 11, 12th
  • the regulating blade 11 facing the cutting-edge gun provides an overflow diameter for the easy liquid phase LL.
  • annular chamber 14 thus forms during operation.
  • annular chamber 14 opens a fluid supply line 15 through which a fluid, e.g. a gas can be passed into the annular chamber 14.
  • a fluid e.g. a gas
  • the overflow diameter of the lighter phase can be preset.
  • the layer thickness of the lighter phase becomes larger and the outflow velocity smaller (longer sedimentation time).
  • the degree of clarification of the lighter phase is thus increased or better.
  • the crossed hatching indicates a mixed phase or separation zone region.
  • the drain pressure of the lighter phase can be largely varied independently of the chamber pressure.
  • the pressure in the annular chamber 14 is increased to further shift the separation zone in the interior of the drum to a larger radius. This usually causes a greater layer thickness and a better degree of clarification of the lighter phase or a better phase separation.
  • the diagram of FIG. 4 shows the behavior at a constant speed.
  • the liquid filling in the drum 1 is not constant due to the change in pressure.
  • D in each case the diameter in the drum on both sides of the axis of rotation is designated.
  • the diameter D_tubes (diameter of discharge pipes) and D_Scheideburg are kept constant during operation, although they are per se changeable (by replacement). Constant are also the inner diameter of the drum and the inner diameter of the solids discharge, which are usually not changeable by conversion.
  • the diameter on which the separation zone lies increases with the pressure.
  • the liquid level D_Spiegelstand decreases inversely proportional to the pressure.
  • Fig. 2 and 3 show the conditions in the drum schematically at two different pressures.
  • control range is smaller in this type of control and can only be used if a change in the drum speed during operation is permitted at all.
  • the diameter of the separation zone then increases with the speed (not shown here).
  • FIG. 5 Another embodiment shows Fig. 5 ,
  • the heavier liquid phase is discharged via the regulating disk arrangement and the peeling disk 9, and the lighter liquid phase via the discharge pipe 8, which is achieved in that the dividing disk-like separating gun is arranged in each case in front of the continuous, second openings 26 open on both sides.
  • the separating rifle 6 thus directs the heavy liquid phase HL to the paring disc, whereas the light phase is discharged into the blind-hole-like or at one end closed first openings 25 via the discharge tubes 8.
  • Fig. 6 shows the state of higher pressure
  • Fig. 7 the state after a pressure drop in the annular chamber 14th
  • control variable for example - preferably - the concentration distribution of any of the derived phases is used.
  • the pressure of the heavy liquid phase in the light increases, the pressure is reduced to further shift the separation zone in the interior of the drum to a larger radiance. This usually causes a greater layer thickness and a better degree of clarification of the lighter phase.
  • Fig. 8 The corresponding control behavior is illustrated Fig. 8 using an example analogous to Fig. 4 , In turn, the different diameters depending on the pressure in the annular chamber 14 are worn.
  • control range is smaller in this type of control and can only be used if a change in the drum speed during operation is permitted at all.

Landscapes

  • Centrifugal Separators (AREA)

Claims (7)

  1. Centrifugeuse à vis à bol plein à trois phases, comprenant :
    a. un tambour (1) rotatif et une vis sans fin (2) disposée dans le tambour (1),
    b. au moins une sortie de solides à l'extrémité axiale du tambour (1) et, à son autre extrémité axiale, au moins deux sorties de liquide ou davantage pour des phases liquides de densité différente, une phase liquide légère (LL) et une phase liquide lourde (HL),
    c. une sortie de liquide présentant un disque racleur (9) disposé dans une chambre de turbine centripète (10) et l'autre sortie de liquide étant conçue comme un trop-plein,
    caractérisée en ce que
    d. le disque racleur (9) est précédé de deux disques régulateurs (11, 12), de préférence de diamètre intérieur égal, qui s'étendent dans le sens radial de l'extérieur vers l'intérieur et entre lesquels plonge un disque à siphon (13) qui s'étend vers l'extérieur dans la chambre de turbine centripète (10) à partir de la circonférence intérieure de celle-ci,
    e. de sorte qu'il se crée en fonctionnement entre le disque à siphon (13) et le disque racleur (9) formant les délimitations axiales, le rayon intérieur de la phase liquide légère dans cette zone axiale et l'enveloppe intérieure de la chambre de turbine centripète (10) une chambre annulaire (14)
    f. dans laquelle au moins une conduite de liquide débouche pour modifier la pression dans la chambre annulaire afin de déplacer la zone de séparation et/ou la profondeur de l'anneau liquide dans le tambour,
    g. des premières et deuxièmes ouvertures axiales (21, 22 ; 25, 26) étant prévues dans le couvercle du tambour et un déversoir de séparation en forme de disque de séparation est associé aux premières ou deuxièmes ouvertures,
    h. et le déversoir de séparation (6) étant dimensionné de telle façon que la phase liquide lourde puisse être amenée par le déversoir de séparation (6) en forme de disque de séparation dans au moins un espace d'évacuation (7) dans lequel au moins un tube d'évacuation (8) traversant l'enveloppe du tambour sert de trop-plein.
  2. Centrifugeuse à vis à bol plein à trois phases selon la revendication 1, caractérisée en ce qu'une partie des premières ou deuxièmes ouvertures (21, 22 ; 25, 26) forment des chambres fermées en forme de trou borgne à leur extrémité axiale.
  3. Centrifugeuse à vis à bol plein à trois phases selon l'une des revendications précédentes, caractérisée en ce que le déversoir de séparation est disposé de telle façon que la phase liquide légère soit amenée vers le disque racleur (9) en fonctionnement.
  4. Centrifugeuse à vis à bol plein à trois phases selon l'une des revendications précédentes, caractérisée en ce que le déversoir de séparation (6) est disposé de telle façon que la phase liquide légère puisse être amenée dans l'espace d'évacuation (7), dans lequel un tube d'évacuation (8) traversant l'enveloppe du tambour sert de trop-plein.
  5. Centrifugeuse à vis à bol plein à trois phases selon l'une des revendications précédentes, caractérisée en ce que le déversoir de séparation est disposé de telle façon que la phase liquide lourde soit amenée au disque racleur (9) en fonctionnement.
  6. Centrifugeuse à vis à bol plein à trois phases selon l'une des revendications précédentes, caractérisée en ce que le disque racleur (9) est disposé dans la chambre de turbine centripète (10), qui se raccorde dans le sens axial à l'intérieur du tambour et dont le diamètre intérieur est égal ou, de préférence, inférieur au diamètre intérieur du tambour (1) dans la partie cylindrique de celui-ci et en ce que les deux disques régulateurs (11, 12) et le disque à siphon (13) sont montés en amont du disque racleur (9) dans la chambre de turbine centripète (10).
  7. Centrifugeuse à vis à bol plein à trois phases selon l'une des revendications précédentes, caractérisée en ce que plusieurs, en particulier entre quatre et huit, premières et deuxièmes ouvertures (21, 22) sont réparties sur la circonférence du couvercle du tambour en un cercle imaginaire, chaque deuxième ouverture étant associée à l'un des canaux de séparation.
EP06754000.5A 2005-06-14 2006-05-31 Centrifugeuse a vis sans fin, a bol plein et a trois phases, et procede pour reguler le processus de separation Active EP1901849B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005027553A DE102005027553A1 (de) 2005-06-14 2005-06-14 Drei-Phasen-Vollmantel-Schneckenzentrifuge und Verfahren zur Regelung des Trennprozesses
PCT/EP2006/005172 WO2006133804A1 (fr) 2005-06-14 2006-05-31 Centrifugeuse a vis sans fin, a bol plein et a trois phases, et procede pour reguler le processus de separation

Publications (2)

Publication Number Publication Date
EP1901849A1 EP1901849A1 (fr) 2008-03-26
EP1901849B1 true EP1901849B1 (fr) 2018-08-29

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EP06754000.5A Active EP1901849B1 (fr) 2005-06-14 2006-05-31 Centrifugeuse a vis sans fin, a bol plein et a trois phases, et procede pour reguler le processus de separation

Country Status (8)

Country Link
US (1) US8523749B2 (fr)
EP (1) EP1901849B1 (fr)
CN (1) CN101203318B (fr)
AU (1) AU2006257485B2 (fr)
CA (1) CA2612022C (fr)
DE (1) DE102005027553A1 (fr)
DK (1) DK1901849T3 (fr)
WO (1) WO2006133804A1 (fr)

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DE102006006178A1 (de) * 2006-02-10 2007-08-16 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge und Verfahren zu deren Betrieb
SE531141C2 (sv) * 2007-05-10 2009-01-07 Alfa Laval Corp Ab Centrifugalseparator med transportörgänga som förhindrar avskiljda partiklar att täppa till rotorns insida
SE534278C2 (sv) * 2009-02-17 2011-06-28 Alfa Laval Corp Ab Ett kontinuerligt förfarande för isolering av oljor från alger eller mikroorganismer

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DE102005027553A1 (de) 2006-12-28
WO2006133804A1 (fr) 2006-12-21
US8523749B2 (en) 2013-09-03
CA2612022C (fr) 2014-08-19
DK1901849T3 (en) 2018-12-17
CN101203318B (zh) 2012-01-11
CA2612022A1 (fr) 2006-12-21
AU2006257485B2 (en) 2011-06-02
EP1901849A1 (fr) 2008-03-26
AU2006257485A1 (en) 2006-12-21
US20100105536A1 (en) 2010-04-29
CN101203318A (zh) 2008-06-18

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