EP2658656B1 - Centrifugeuse à vis sans fin et à bol plein, munie d'un déversoir - Google Patents

Centrifugeuse à vis sans fin et à bol plein, munie d'un déversoir Download PDF

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Publication number
EP2658656B1
EP2658656B1 EP11794487.6A EP11794487A EP2658656B1 EP 2658656 B1 EP2658656 B1 EP 2658656B1 EP 11794487 A EP11794487 A EP 11794487A EP 2658656 B1 EP2658656 B1 EP 2658656B1
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EP
European Patent Office
Prior art keywords
solid
drum
screw centrifuge
bowl screw
rotation
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.)
Active
Application number
EP11794487.6A
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German (de)
English (en)
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EP2658656A1 (fr
Inventor
Stefan Terholsen
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 date
Application filed by GEA Mechanical Equipment GmbH filed Critical GEA Mechanical Equipment GmbH
Publication of EP2658656A1 publication Critical patent/EP2658656A1/fr
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Publication of EP2658656B1 publication Critical patent/EP2658656B1/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
    • 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
    • B04B2001/2075—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 means for recovering the energy of the outflowing liquid
    • 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 solid bowl screw centrifuge according to the preamble of claim 1.
  • Solid bowl centrifuges are known in various embodiments.
  • Nozzles on solid bowl centrifuges and their effect of energy saving with a corresponding orientation inclined to the drum axis are further from the DE 39 04 151 A1 known.
  • baffles can be assigned, which give the liquid emerging from the drum a spin, the recoil effect occurring is to be used to save energy.
  • the baffles are attached to the outside of the overflow weir, for example to the weir plates. They are for example formed as flat sheets, which are aligned parallel to the drum rotation axis, wherein the plane in which lie the flat sheets, the drum axis does not intersect and approximately at an angle of about 45 ° with the radially extending straight line, which in each case by the drum rotation axis and the respective passage opening extends.
  • the object of the invention is to provide a solid shell screw centrifuge optimized with regard to energy saving, which can also be regarded as advantageous from a hygienic point of view.
  • Liquids with fibrous solids may, in a complicated designed passage opening to the problem that the fibers get stuck on exit from the housing in certain areas, so provided for receiving the weir plate grooves. This can happen especially during shutdowns, when the liquid ring collapses suddenly due to small centrifugal forces but constant gravitational force and the drum empties spontaneously.
  • housings as a device for the discharge of liquid as have been variously proposed in the prior art, product deposits can easily form, since a near-surface layer flow is formed, which can not rinse the central regions of the housing of solids. Due to the open design of the drainage channels, the o.g. Disadvantages avoided.
  • the variants of the invention with the open drainage channel is also advantageous in that the present invention leaves the overflow weir directly to the weir plates on the drum cover and only the liquid, which has already left the rotating system on the overflow weir, is deflected in the circumferential direction. After emerging from the drum, no clearing effect can occur any more, but the entire outgoing liquid jet is deflected by the deflector in the circumferential direction.
  • the chosen constructions also avoid that the liquid contained in the housing exert too high unwanted additional centrifugal forces on the drum.
  • the outlet or discharge channels can not fill with liquid, it forms only a relatively thin layer of liquid that exerts relatively little additional forces.
  • the inclined passage openings in the end-face drum wall combined with a weir plate without outlet element or with a weir plate which has a "grooved" contour and in particular the embedded in the drum wall insert have the advantage that the required space in the axial direction for the rotor relative is small. This makes it possible to minimize the use of material for the rotor, the frame carrying the rotor and the housing surrounding the rotor. In addition, the storage distance is shortened, which can be due to the improved machine dynamics properties achieve higher speeds of the centrifuge, as the speed-limiting natural frequencies shift to higher values.
  • the design with an insert embedded in the drum wall offers the advantage that adjustments of the inner contour to product properties and also to operating parameters, such as, for example, the throughput capacity are possible without changing the drum wall.
  • the inserts can also be easily exchanged.
  • the figures below is partially associated with a schematic representation of a coordinate system in the center of which the axis of rotation D of a centrifuge drum is located and in which the arrow U indicates the direction of rotation of a centrifuge drum.
  • Fig. 1 should first clarify the basic structure of a solid bowl centrifuge. The drive together with control, a hood and other for the expert obvious elements are not shown here.
  • Fig. 1 shows a solid bowl screw centrifuge 1 with a preferably horizontal axis of rotation D rotatable drum 3, in which a likewise rotatable screw 5 is arranged.
  • the drum 3 and the screw 5 each have a substantially cylindrical portion and a conically tapered portion here.
  • An axially extending centric inlet pipe 7 serves to supply the centrifuged material via a distributor 9 into the centrifugal space 11 between the screw 5 and the drum 3.
  • the screw 5 rotates at a slightly lower or greater speed than the drum 3 and conveys the ejected solid to the conical portion out of the drum 3 to the solids discharge 13th
  • each passage opening 15 flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is discharged through a weir having passage openings 15 in a drum cover 17, each passage opening 15 is associated with a weir plate 19, which here radially adjustable on the outside the drum lid is attached.
  • the inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21.
  • the passage opening 15 and the weir plate 19 with the overflow weir 21 form in Fig. 1 each in their interaction a "means 23 for the discharge of liquid from the centrifuge drum" from. It is preferably provided to provide not only one of these devices 23 on the drum cover, but to distribute at least one radius in each case several of these devices in the circumferential direction.
  • a radial adjustability of the weir plates 19 can also be achieved, for example, simply via hole patterns 37 (see FIG Fig. 5 ) with selectable radial holes or bores on the weir plate and corresponding bores on the drum cover and bolts or the like. Realized to thereby allow easy adjustment of the liquid level diameter in the drum.
  • the hole patterns are for simplicity only in Fig. 5 illustrated, but preferably provided in all versions.
  • the drum cover and / or the at least one device 23 for the discharge of liquid from the centrifuge drum by a corresponding device 23 'of Fig. 2 to 14 be replaced.
  • the 3 and 4 show plan views of two different devices 23 'and Fig. 2 shows a section through a corresponding device 23 '.
  • modified devices 23 'for discharging liquid from a centrifuge drum which in turn comprise one or more passage openings (s) 15 in a drum cover 17 at a certain radius outside the axis of rotation D and in each case one the associated passage opening 15 completely or partially covering weir plate 19.
  • the devices 23 'further each have a discharge channel 25, which is formed on the respective weir plate 19 and / or formed integrally therewith.
  • the weir plate 19 of Fig. 2 to 4 is preferably directly outside the drum cover 17 aligned parallel to the drum cover 17 at.
  • the weir 21 is placed in this area on a further outward at the bottom of the recess radius R27.
  • the material recess 27 on the outside of the weir plate 19 preferably merges into the discharge channel 25 in alignment. It thus forms the beginning of the discharge channel 25 itself.
  • the discharge channel 25 can (see Fig. 5 ) consist only of the material recess 27 when the weir plate 19 is sufficiently thick and the material recess accordingly in an inclination angle ⁇ (see Fig. 6 ) is aligned with the direction of rotation U.
  • the material recess is lengthened by a groove element 29 extending the weir plate on its side facing away from the drum 1.
  • the discharge channel 25 is designed to be open at least on its radially inward-pointing side and preferably also on its end remote from the weir plate 19.
  • the discharge channel has lateral deflection walls 31a, 31b, which may be flat or curved.
  • the cross section of the discharge channel 25 - see, for example Fig. 2 - can be designed in different ways. It is essential that the discharge channel 25 is radially open inwards towards the axis of rotation D, preferably completely (in particular in the direction of flow of the exiting liquid). Especially the completely inwardly open design is insensitive to contamination, the Contamination tendency can be further reduced by rounding off corner areas of the discharge channel 25.
  • the cross section of the discharge channel 25 can be correspondingly angular ( Fig. 3 ) or rather rounded ( Fig. 4 ).
  • the cross-section can be constant over the length of the discharge channel or change.
  • the drainage channel 25 is formed on structurally particularly simple and cost-effective and again insensitive to contamination only in that the weir plates 19 each have no elongated channel member 29 but that only the material recess 27 is provided on the weir plate whose side walls 31a, 31b in the circumferential direction not are axially aligned but opposite to the direction of rotation obliquely or bent, so as to deflect the exiting flow against the rotational direction.
  • the weir plates 19 of FIGS. 5 and 6 Due to their configuration, for the sake of simplicity, they are also referred to below as "grooved" weir plates 19.
  • the overflow weir 21 of the embodiments according to the Fig. 2 to 6 is located at the inlet of the liquid in the material recess 27 of the weir plate 19, which thus determines the diameter of the liquid level in the drum.
  • the angle ⁇ is less than 0 °, for example, less than -30 ° (not shown), even if this occurs an exit of the liquid phase in the direction of the drum cover itself.
  • FIGS. 7 and 8 show further embodiments of outlet elements, which have a radially inwardly open discharge channel 25.
  • the gutter element 29 of the discharge channel has a shape running concentrically on a circular arc section with a constant radius. Therefore, in particular, the bottom wall 35, in whole or in sections, has a rounded shape, in particular concentric with the center of rotation.
  • Fig. 2 to 8 Embodiments relate to which in any case wholly open drainage channels 25 in a weir plate 19 and preferably in an axial groove-like extension - channel element 29 - the weir plate 19 are formed, it is also conceivable to redirect the liquid flowing out of the drum 1 in the circumferential direction in that the drum cover itself has passage openings 15 which do not extend in the axial direction, but which are inclined relative to the longitudinal axis D of the drum by an angle ⁇ .
  • the passage openings 15 are thus, for example, although cylindrical in itself, but oriented obliquely to the axis of rotation, wherein the angle ⁇ between the axis of rotation D and the central axis of the passage openings 15 in any case in sections greater than 0 ° and smaller than 90 °.
  • the passage opening can also be curved in itself. Mixed forms of the described embodiments are readily feasible.
  • Each of the "inclined" passage openings 15 is preferably covered by a corresponding weir plate 19 up to a predetermined radius.
  • this covering weir plate 19 each have a "straight" overflow edge or weir edge 21, which is on a predetermined, preferably by means of hole patterns or the like. Adjustable radius.
  • the "inclined" passage openings with weir plates 19 in the manner of Fig. 2 to 8 to combine, ie with weir plates having a kind of discharge channel 25, at least in the form of a groove contour, in order to achieve such a particularly advantageous discharge behavior.
  • FIGS. 11 and 12 Versions with inclined passage openings 15 in the front-side drum wall 17 and weir plates 19, a "grooved" beveled contour of the type Fig. 6 or 7 exhibit.
  • Fig. 13 further shows an embodiment, which advantageously the inclined passage openings 15 in the end-side drum wall 17 in each case with one of the weir plates 19 with a channel element 29 in the manner of Fig. 2 or 3 combined.
  • the Fig. 14 also illustrates the ability to insert into the openings 15 of the drum cover inserts 41, for example, threaded inserts which are screwed into screw holes of the drum cover 17, these inserts can be used even in axial bores of the drum cover and then in turn may have holes 43 which are inclined are aligned to the drum axis D and D '.
  • the inserts 41 in the drum wall or in the drum cover can be configured in various ways.
  • the axial extent of the insert 41 of the axial thickness of the drum wall and the axial thickness of the drum cover correspond ( Fig. 14 ).

Landscapes

  • Centrifugal Separators (AREA)

Claims (16)

  1. Centrifugeuse à vis à bol plein dotée d'au moins un dispositif (23') pour évacuer un liquide clarifié d'un tambour rotatif (3),
    a. le dispositif (23') comportant au moins une ou plusieurs ouvertures de passage (15) dans un couvercle de tambour (17),
    b. une plaque de barrage (19) étant associée à chacune desdites au moins une ouverture de passage (15), laquelle présente et forme chaque fois un déversoir (21) sur son bord intérieur radial,
    caractérisée en ce que
    c. la plaque de barrage (19) présente un évidement de matériau, lequel forme au moins une partie d'une rigole d'évacuation (25) ou une rigole d'évacuation complète (25),
    d. la rigole d'évacuation (25) étant formée de manière à dévier le flux sortant du tambour à l'encontre d'une direction de rotation et à un angle β > 0° et β <= 90° par rapport à l'axe de rotation ainsi que non en direction du couvercle de tambour.
  2. Centrifugeuse à vis à bol plein selon la revendication 1, caractérisée en ce que l'évidement de matériau (27) se prolonge, sur le côté extérieur (45) de la plaque de barrage (19) éloigné de l'intérieur du tambour, de préférence en alignement, par un élément de rigole (29) rapporté ou formé sur la plaque de barrage, de sorte que la rigole d'évacuation (25) est formée de l'évidement de matériau (27) et de l'élément de rigole (29).
  3. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la rigole d'évacuation (25) est réalisée ouverte au moins sur son côté tourné radialement vers l'intérieur.
  4. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la rigole d'évacuation (25) est réalisée ouverte à son extrémité éloignée de la plaque de barrage (19).
  5. Centrifugeuse à vis à bol plein selon l'une ou plusieurs des revendications précédentes, caractérisée en ce que l'élément de rigole (29) est réalisé ouvert radialement vers l'intérieur en totalité ou sur certaines parties.
  6. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la rigole d'évacuation (25) présente des parois de déviation latérales (31a, 31b) qui sont orientées de telle sorte qu'elles dévient le flux sortant du tambour d'un angle γ par rapport à la direction ou au plan de rotation (U).
  7. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la section transversale de la rigole d'évacuation (25) est polygonale ou arrondie.
  8. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la rigole d'évacuation (25) présente une paroi de fond (35) qui s'étend en ligne droite dans la direction tangentielle (U).
  9. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la plaque de barrage (19) ne présente pas d'élément de rigole (29) qui la prolonge sur son côté éloigné du couvercle de tambour, mais seulement l'évidement de matériau (27), dont les parois latérales (31a, 31b) ne sont pas orientées axialement, mais inclinées ou incurvées par rapport à la direction ou au plan de rotation (U), afin de dévier le flux sortant quelque peu ou entièrement dans la direction ou le plan de rotation, de sorte que les plaques de barrage présentent une forme rainurée.
  10. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la sortie de liquide de la rigole d'évacuation (25) est inclinée d'un angle γ par rapport au plan de rotation.
  11. Centrifugeuse à vis à bol plein selon la revendication 10, caractérisée en ce que l'angle γ est tel que : γ >= 0° et γ < 90°.
  12. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que la paroi de fond (35, 35') de la rigole d'évacuation (25) présente sur toute sa longueur ou sur certaines parties une forme arrondie, en particulier s'étendant concentriquement au centre de rotation.
  13. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes ou selon le préambule de la revendication 1, caractérisée en ce que le couvercle de tambour (17) présente une ou plusieurs ouvertures de passage (15) qui sont chacune inclinées par rapport à l'axe longitudinal (D) du tambour (1), pour dévier le liquide sortant à l'encontre de la direction de rotation dans la direction ou le plan circonférentiel, d'un angle δ qui est dans tous les cas, sur certaines parties ou de préférence entièrement, supérieur à 0° et inférieur à 90° et qui est en particulier tel que : δ >= 20° et δ <= 60°.
  14. Centrifugeuse à vis à bol plein selon la revendication 13, caractérisée en ce que chacune des ouvertures de passage inclinées (15) est partiellement recouverte par une plaque de barrage (19) correspondante.
  15. Centrifugeuse à vis à bol plein selon l'une des revendications précédentes, caractérisée en ce que dans chacune desdites une ou plusieurs ouvertures de passage (15) est inséré un insert (41) dont le contour intérieur est incliné d'un angle δ par rapport à l'axe de rotation (D) du tambour.
  16. Centrifugeuse à vis à bol plein selon l'une des revendications 13 à 15, caractérisée en ce que l'angle δ est égal à l'angle β.
EP11794487.6A 2010-12-27 2011-12-13 Centrifugeuse à vis sans fin et à bol plein, munie d'un déversoir Active EP2658656B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010061563A DE102010061563A1 (de) 2010-12-27 2010-12-27 Vollmantel-Schneckenzentrifuge mit Überlaufwehr
PCT/EP2011/072539 WO2012089492A1 (fr) 2010-12-27 2011-12-13 Centrifugeuse à vis sans fin et à bol plein, munie d'un déversoir

Publications (2)

Publication Number Publication Date
EP2658656A1 EP2658656A1 (fr) 2013-11-06
EP2658656B1 true EP2658656B1 (fr) 2018-01-31

Family

ID=45319113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11794487.6A Active EP2658656B1 (fr) 2010-12-27 2011-12-13 Centrifugeuse à vis sans fin et à bol plein, munie d'un déversoir

Country Status (4)

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EP (1) EP2658656B1 (fr)
DE (1) DE102010061563A1 (fr)
DK (1) DK2658656T3 (fr)
WO (1) WO2012089492A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK176946B1 (da) * 2007-05-09 2010-06-14 Alfa Laval Corp Ab Centrifugalseparator og et væskefaseafløbsportelement
DK200801848A (en) * 2008-12-30 2010-07-01 Alfa Laval Corp Ab A decanter centrifuge and a decanter centrifuge discharge port memeber.
EP2659985B2 (fr) * 2011-07-29 2019-11-06 Flottweg SE Centrifugeuse à vis a bol plein dotée d'un bord faisant barrage
PL2551021T3 (pl) * 2011-07-29 2017-02-28 Andritz S.A.S. Wirówka i człon otworu wypływowego wirówki do zmniejszenia mocy
DE102012106226A1 (de) 2012-07-11 2014-01-16 Gea Mechanical Equipment Gmbh Vollmantel-Schneckenzentrifuge mit Überlaufwehr
JP5220950B1 (ja) 2012-11-02 2013-06-26 巴工業株式会社 分離液噴射ノズル付き遠心分離機
DK2789395T4 (da) 2013-04-08 2020-02-10 Flottweg Se Dekantercentrifuge med en energigenvindingsenhed
JP2017018868A (ja) * 2015-07-08 2017-01-26 株式会社Ihi 遠心分離装置
DE102017130904B4 (de) * 2017-12-21 2019-07-11 Flottweg Se Auslassvorrichtung einer Vollmantelschneckenzentrifuge mit einem Umlenkgerinne

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56129842U (fr) * 1980-03-03 1981-10-02
DE3822983A1 (de) * 1988-07-07 1990-01-11 Hiller Gmbh Vollmantel-schneckenzentrifuge
DE3900415A1 (de) 1989-01-09 1990-07-12 Teves Gmbh Alfred Unterdruck-bremskraftverstaerker
DE3904151A1 (de) 1989-02-11 1990-08-16 Heckmann Wolfgang Zentrifuge
JP3543597B2 (ja) 1997-12-22 2004-07-14 株式会社クボタ 横型遠心分離機における分離水の排出装置
DE10203652B4 (de) 2002-01-30 2006-10-19 Westfalia Separator Ag Vollmantel-Schneckenzentrifuge mit einem Wehr
US20040072668A1 (en) 2002-10-15 2004-04-15 Baker Hughes Incorporated Liquid phase discharge port incorporating chamber nozzle device for centrifuge
DK176946B1 (da) 2007-05-09 2010-06-14 Alfa Laval Corp Ab Centrifugalseparator og et væskefaseafløbsportelement
JP5009764B2 (ja) * 2007-12-06 2012-08-22 巴工業株式会社 横型遠心分離装置およびダム形成部材

Also Published As

Publication number Publication date
EP2658656A1 (fr) 2013-11-06
DE102010061563A1 (de) 2012-06-28
WO2012089492A1 (fr) 2012-07-05
DK2658656T3 (en) 2018-05-07

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