EP2598251B1 - Solid bowl screw centrifuge having an overflow weir - Google Patents

Solid bowl screw centrifuge having an overflow weir Download PDF

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Publication number
EP2598251B1
EP2598251B1 EP11735650.1A EP11735650A EP2598251B1 EP 2598251 B1 EP2598251 B1 EP 2598251B1 EP 11735650 A EP11735650 A EP 11735650A EP 2598251 B1 EP2598251 B1 EP 2598251B1
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EP
European Patent Office
Prior art keywords
wall
solid
screw centrifuge
weir
centrifuge according
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EP11735650.1A
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German (de)
French (fr)
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EP2598251A2 (en
Inventor
Stefan Terholsen
Jürgen HERMELER
Ludger HORSTKÖTTER
Kathrin Quiter
Jürgen TEIGELER
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GEA Mechanical Equipment GmbH
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GEA Mechanical Equipment GmbH
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    • 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.
  • the JP 11 197547 A discloses a solid bowl screw centrifuge having at least one drain for discharging clarified liquid from a drum having at least one or more passages in a drum cover, each of which is associated with a weir plate defining an overflow weir at each of its radially inner edges Furthermore, at least one deflection device is formed in the drum cover, so that an emerging liquid flow is deflected in the radial direction.
  • 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 invention has, starting from this prior art, the task of creating a further optimized in terms of energy conservation solid bowl screw centrifuge.
  • the deflection device designed such that an escaping fluid flow while maintaining the overflow weir on the weir edge directly in the axial extension of the passage opening experiences a twist in the circumferential direction.
  • baffle is at least partially directly in the axial extension of the area of the passage opening not covered by the respective weir plate axially outside the passage opening and this covers axially in whole or in part.
  • 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.
  • Fig. 2 should clarify the basic structure of a solid bowl centrifuge. The drive together with control, a hood and other obvious for the expert elements are not shown here.
  • Fig. 2 shows a solid bowl screw centrifuge 1 with a rotatable about a rotation axis D 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 promotes the ejected solid to the conical portion out of the drum 3 to the solids discharge 13.
  • the liquid flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is derived there through a weir, the passage openings 15 in a drum cover 17, wherein each passage opening 15 is associated with a weir plate 19, which here radially adjustably mounted on the outside of the drum cover.
  • the inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21.
  • the drum cover or the at least one weir plate on the drum cover by the drum cover and the weir plate of Fig. 1 be replaced.
  • the drum lid 17 also has passage openings 15, to each of which a weir plate 19 is assigned.
  • the weir plates 19 are preferably directly outside the drum cover 17 aligned parallel to this.
  • the weir plates 19 in turn form at their relative to the axis of rotation D inner radius R k each have an overflow edge and thus an overflow weir 21.
  • a deflector 23 is preferably attached on the outside of each of the weir plates 19, a deflector 23 is preferably attached.
  • the deflecting device 23 preferably has in each case a supporting wall 25 extending parallel to the weir plate-an axial wall section-and a deflecting wall 27 oriented at right angles thereto.
  • the axial wall section may be flat or rounded.
  • the connecting line between the support wall 25 and the weir plate 19 carries the reference numeral 31.
  • the support wall 25 is preferably aligned with the overflow edge at the radius R k of the weir plate 19. This advantageously ensures that the actual weir 21 is not changed in its position, it is still formed by the inner edge or overflow edge R k of the weir plates 15 , This has the advantage that the advantageous properties of such overflow weir 21 are maintained on a weir plate 19.
  • connection line 31 radially further outwards, for example, 0, 5 mm to 3 mm further out.
  • the baffle 27 causes the actual deflection of the exiting product flow or the imposition of a twist in the circumferential direction, but does not change the position of the weir or the overflow edge.
  • the baffle 27 merely causes the liquid, which has flowed over the overflow weir, is deflected from the axial direction.
  • a deflection of the liquid jet is achieved substantially in the circumferential direction, resulting in an overall energy savings over a liquid leakage in the axial direction.
  • the baffle has an arcuate wall portion 27a and a subsequent planar wall portion 27b.
  • the arcuate portion 27a causes a deflection of the liquid phase flowing in the axial direction X from the drum 3 in the circumferential direction or the imposition of a twist in the circumferential direction (against the direction of rotation).
  • the flat wall portion 27b forwards the product flow one piece in this direction.
  • the arcuate portion 27a is dimensioned such that substantially the deflection of the product flow from the axial direction X takes place here against the direction of rotation U, so that a recoil effect results, which results in an energy saving or energy recovery.
  • the selected deflection angle ⁇ - which corresponds to the orientation of the planar wall section relative to the axial direction - is preferably less than 90 °, preferably the deflection angle ⁇ is approximately 70 to 85 °.
  • the deflection angle ⁇ is preferably smaller than 90 °, it is ensured in a simple manner that not too much of the drum 1 flowing out or exiting liquid is deflected so far from the axial direction that the liquid splashes against the outside of the drum cover 17 again which would mean a certain loss of energy.
  • the baffle 27 at least partially lies directly in the axial extension outside the passage opening and this covers completely or partially axially on the radius of the passage opening.
  • weir plate 17 and the deflector 23 are materially interconnected and thus form a structural unit.
  • the weir plates 17 and the deflector 23 mounted thereon are radially adjustable together, e.g. by means of screws (not shown), with which the weir plates 19 are screwed to the drum cover 17 respectively.
  • a plurality of screw holes 29 are preferably distributed radially offset from each other on the weir plates, so that by a suitable choice of screw holes 29 in a simple manner, the radial position of the weir plates 19 on the drum cover 17 is adjustable.
  • the construction according to the invention can be cleaned well. By maintaining the position of the overflow weir 21 is avoided that forms a space in which easily soiling can settle.

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  • Centrifugal Separators (AREA)

Description

Die Erfindung betrifft eine Vollmantel-Schneckenzentrifuge nach dem Oberbegriff des Anspruchs 1.The invention relates to a solid bowl screw centrifuge according to the preamble of claim 1.

Vollmantel-Schneckenzentrifugen sind in verschiedensten Ausführungsformen bekannt.Solid bowl centrifuges are known in various embodiments.

So offenbart die DE 102 03 652 B4 eine Vollmantel-Schneckenzentrifuge mit einer Einrichtung zum Ableiten geklärter Flüssigkeit aus einer Trommel, die einen Trommeldeckel mit einem Durchlass aufweist, dem eine Drosseleinrichtung, insbesondere eine Drosselscheibe, zugeordnet ist, deren Abstand zum Durchlass veränderlich ist. Dabei sind dem Durchlass ferner Düsen zum Auslass der geklärten Flüssigkeit zugeordnet, welche zur Energieeinsparung geneigt zur Radialrichtung durch die Trommelachse ausgerichtet sind.So revealed the DE 102 03 652 B4 a solid bowl screw centrifuge with a device for discharging clarified liquid from a drum having a drum cover with a passage to which a throttle device, in particular a throttle plate, is assigned, whose distance from the passage is variable. In this case, the passage further nozzles are assigned to the outlet of the clarified liquid, which are aligned for energy saving inclined to the radial direction through the drum axis.

Düsen an Vollmantelschneckenzentrifugen und ihr Effekt der Energieeinsparung bei entsprechender Ausrichtung geneigt zur Trommelachse sind ferner aus der DE 39 04 151 A1 bekannt.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.

Die JP 11 197547 A offenbart eine Vollmantel-Schneckenzentrifuge mit wenigstens einem Ablauf zum Ableiten geklärter Flüssigkeit aus einer Trommel, der wenigstens einen oder mehrere Durchlässe in einem Trommeldeckel aufweist, dem oder denen jeweils eine Wehrplatte zugeordnet ist, die an ihrer radialen Innenkante jeweils ein Überlaufwehr bilden, wobei außen an dem Trommeldeckel ferner wenigstens eine Ablenkeinrichtung ausgebildet ist, so dass ein austretender Flüssigkeitsstrom in radialer Richtung abgelenkt wird.The JP 11 197547 A discloses a solid bowl screw centrifuge having at least one drain for discharging clarified liquid from a drum having at least one or more passages in a drum cover, each of which is associated with a weir plate defining an overflow weir at each of its radially inner edges Furthermore, at least one deflection device is formed in the drum cover, so that an emerging liquid flow is deflected in the radial direction.

Die Veröffentlichung "Patent Abstracts of Japan", Nummer 11179236 A , offenbart demgegenüber, dass Durchlassöffnungen im Trommeldeckel, die jeweils teilweise von einer Wehrplatte verschlossen sind, welche ein Überlaufwehr bilden, Leitbleche zugeordnet werden können, welche der aus der Trommel austretenden Flüssigkeit einen Drall geben, wobei der auftretende Rückstoßeffekt zur Energieeinsparung genutzt werden soll. Die Leitbleche sind an der Außenseite des Überlaufwehrs beispielsweise an den Wehrplatten angebracht. Sie sind beispielsweise als ebene Bleche ausgebildet, welche parallel zur Trommeldrehachse ausgerichtet sind, wobei die Ebene, in welcher die ebenen Bleche liegen, die Trommelachse nicht schneidet und etwa einen Winkel von etwa 45° mit der radial verlaufenden Gerade einschließt, welche jeweils durch die Trommeldrehachse und die jeweilige Durchlassöffnung verläuft.The publication "Patent Abstracts of Japan", number 11179236 A discloses, in contrast, that passage openings in the drum cover, which are each partially closed by a weir plate, which form an overflow weir, baffles can be assigned, which give the fluid 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.

Die Erfindung hat ausgehend von diesem Stand der Technik die Aufgabe, eine hinsichtlich der Energieeinsparung weiter optimierte Vollmantel-Schneckenzentrifuge zu schaffen.The invention has, starting from this prior art, the task of creating a further optimized in terms of energy conservation solid bowl screw centrifuge.

Die Erfindung löst diese Aufgabe durch den Gegenstand des Anspruchs 1.The invention solves this problem by the subject matter of claim 1.

Danach ist - vorzugsweise an der Wehrplatte - die Ablenkeinrichtung derart ausgestaltet, dass ein austretender Flüssigkeitsstrom unter Beibehaltung des Überlaufwehrs an der Wehrkante direkt in axialer Verlängerung der Durchtrittsöffnung einen Drall in Umfangsrichtung erfährt.Thereafter - preferably on the weir plate - the deflection device designed such that an escaping fluid flow while maintaining the overflow weir on the weir edge directly in the axial extension of the passage opening experiences a twist in the circumferential direction.

Erreicht werden kann dies nach einer ganz besonders bevorzugten Ausführungsform beispielsweise dadurch, dass die Ablenkwand jedenfalls teilweise direkt in axialer Verlängerung des von der jeweiligen Wehrplatte nicht abgedeckten Bereichs der Durchlassöffnung axial außen vor der Durchlassöffnung liegt und diese axial ganz oder teilweise abdeckt.This can be achieved according to a particularly preferred embodiment, for example, by the fact that the baffle is at least partially directly in the axial extension of the area of the passage opening not covered by the respective weir plate axially outside the passage opening and this covers axially in whole or in part.

Es ist auch zwar bekannt - so aus der US 2004/0072668 A1 oder der WO 2008/138345 A1 - anstelle eines Überlaufwehr an der Wehrplatte der Durchlassöffnung ein Gehäuse zuzuordnen, wobei dann das Überlaufwehr oder eine Düse in einer Schrägseite des Gehäuses an der Durchlassöffnung ausgebildet werden. Diese Konstruktionen bringen jedoch den Nachteil mit sich, dass an der Außenseite des Trommeldeckels mit rotierende Flüssigkeitskammern gebildet werden, die einen Teil des rotierenden Systems bilden, so dass sich in den Flüssigkeitskammern noch der Klär- oder Trennvorgang fortsetzt. Aus diesem Trennvorgang können unerwünschte Ablagerungen in den Kammern resultieren, welche Reinigungsprobleme mit sich bringen.It is also known - so from the US 2004/0072668 A1 or the WO 2008/138345 A1 - Instead of an overflow weir on the weir plate of the passage opening to assign a housing, in which case the overflow weir or a nozzle are formed in a sloping side of the housing at the passage opening. However, these constructions have the disadvantage that are formed on the outside of the drum cover with rotating fluid chambers that form part of the rotating system, so that in the fluid chambers, the clarification or separation process continues. From this separation process undesirable deposits in the chambers can result, which bring cleaning problems with it.

Es ist daher vorteilhaft, dass die vorliegende Erfindung das Überlaufwehr an sich direkt an den Wehrplatten am Trommeldeckel belässt und erst die Flüssigkeit, welche das rotierende System bereits über das Überlaufwehr verlassen hat, in Umfangsrichtung umgelenkt wird. Nach dem Austritt aus der Trommel kann kein Kläreffekt mehr auftreten, der gesamte austretende Flüssigkeitsstrahl wird vielmehr durch die Ablenkeinrichtung in Umfangsrichtung abgelenkt.It is therefore advantageous 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.

Weitere vorteilhafte Ausgestaltungen sind den übrigen Unteransprüchen zu entnehmen.Further advantageous embodiments can be found in the remaining subclaims.

Nachfolgend wird die Erfindung unter Bezug auf die Zeichnung näher beschrieben. Es zeigt:

  • Fig. 1 einen schematisch dargestellten Trommeldeckel einer erfindungsgemäßen Vollmantel-Schneckenzentrifuge; und
  • Fig. 2 eine schematische Ansicht einer bekannten Vollmantel-Schneckenzentrifuge.
The invention will be described in more detail with reference to the drawing. It shows:
  • Fig. 1 a drum cover shown schematically a solid bowl screw centrifuge according to the invention; and
  • Fig. 2 a schematic view of a known solid bowl screw centrifuge.

Fig. 2 soll den grundsätzlichen Aufbau einer Vollmantel-Schneckenzentrifuge verdeutlichen. Der Antrieb nebst Steuerung, eine Haube und weitere für den Fachmann selbstverständliche Elemente sind hier nicht dargestellt. Fig. 2 should clarify the basic structure of a solid bowl centrifuge. The drive together with control, a hood and other obvious for the expert elements are not shown here.

Fig. 2 zeigt eine Vollmantel-Schneckenzentrifuge 1 mit einer um eine Drehachse D drehbaren Trommel 3, in der eine ebenfalls drehbare Schnecke 5 angeordnet ist. Die Trommel 3 und die Schnecke 5 weisen jeweils einen im Wesentlichen zylindrischen Abschnitt und einen sich hier konisch verjüngenden Abschnitt auf. Fig. 2 shows a solid bowl screw centrifuge 1 with a rotatable about a rotation axis D 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.

Ein sich axial erstreckendes zentrisches Einlaufrohr 7 dient zur Zuleitung des Schleudergutes über einen Verteiler 9 in den Schleuderraum 11 zwischen der Schnecke 5 und der Trommel 3.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.

Wird beispielsweise ein schlammiger Brei in die Zentrifuge geleitet, setzen sich an der Trommelwandung gröbere Feststoffpartikel ab. Weiter nach innen hin bildet sich eine Flüssigkeitsphase aus.If, for example, a muddy slurry is fed into the centrifuge, coarser solid particles settle on the drum wall. Further inward, a liquid phase forms.

Die Schnecke 5 rotiert mit einer etwas kleineren oder größeren Geschwindigkeit als die Trommel 3 und fördert den ausgeschleuderten Feststoff zum konischen Abschnitt hin aus der Trommel 3 zum Feststoffaustrag 13. Die Flüssigkeit strömt dagegen zum größeren Trommeldurchmesser am hinteren Ende des zylindrischen Abschnittes der Trommel 3 und wird dort durch über ein Wehr abgeleitet, das Durchlassöffnungen 15 in einem Trommeldeckel 17 aufweist, wobei jeder Durchlassöffnung 15 eine Wehrplatte 19 zugeordnet ist, welche hier radial verstellbar an der Außenseite des Trommeldeckels angebracht ist. Die innere radiale Kante der Wehrplatte definiert damit eine Überlaufkante und damit auch das eigentliche Wehr bzw. Überlaufwehr 21.The screw 5 rotates at a slightly lower or greater speed than the drum 3 and promotes the ejected solid to the conical portion out of the drum 3 to the solids discharge 13. The liquid, however, flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is derived there through a weir, the passage openings 15 in a drum cover 17, wherein each passage opening 15 is associated with a weir plate 19, which here radially adjustably mounted on the outside of the drum cover. The inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21.

Erfindungsgemäß kann z.B. bei einer Vollmantel-Schneckenzentrifuge nach Art der Fig. 2 der Trommeldeckel bzw. die wenigstens eine Wehrplatte am Trommeldeckel durch den Trommeldeckel bzw. die Wehrplatte der Fig. 1 ersetzt werden.According to the invention, for example, in a solid bowl centrifuge on the type of Fig. 2 the drum cover or the at least one weir plate on the drum cover by the drum cover and the weir plate of Fig. 1 be replaced.

Nach Fig. 1 weist der Trommeldeckel 17 ebenfalls Durchlassöffnungen 15 auf, denen jeweils eine Wehrplatte 19 zugeordnet ist. Die Wehrplatten 19 liegen vorzugsweise direkt außen am Trommeldeckel 17 parallel ausgerichtet an diesem an.To Fig. 1 The drum lid 17 also has passage openings 15, to each of which a weir plate 19 is assigned. The weir plates 19 are preferably directly outside the drum cover 17 aligned parallel to this.

Die Wehrplatten 19 bilden wiederum an ihrem relativ zur Drehachse D inneren Radius Rk jeweils eine Überlaufkante und damit ein Überlaufwehr 21 aus.The weir plates 19 in turn form at their relative to the axis of rotation D inner radius R k each have an overflow edge and thus an overflow weir 21.

Außen ist an vorzugsweise jeder der Wehrplatten 19 eine Ablenkeinrichtung 23 angebracht. Die Ablenkeinrichtung 23 weist jeweils vorzugsweise eine sich parallel zur Wehrplatte erstreckende Stützwand 25 auf - einen Axialwandabschnitt - und eine hierzu rechtwinklig ausgerichtete Ablenkwand 27. Der Axialwandabschnitt kann eben oder aber auch gerundet ausgebildet sein. Die Verbindungslinie zwischen der Stützwand 25 und der Wehrplatte 19 trägt das Bezugszeichen 31.On the outside of each of the weir plates 19, a deflector 23 is preferably attached. The deflecting device 23 preferably has in each case a supporting wall 25 extending parallel to the weir plate-an axial wall section-and a deflecting wall 27 oriented at right angles thereto. The axial wall section may be flat or rounded. The connecting line between the support wall 25 and the weir plate 19 carries the reference numeral 31.

Die Stützwand 25 fluchtet vorzugsweise mit der Überlaufkante am Radius Rk der Wehrplatte 19. Hierdurch wird vorteilhaft erreicht, dass das eigentliche Wehr 21 hinsichtlich seiner Lage nicht verändert wird, es wird nach wie vor von der Innenkante bzw. Überlaufkante Rk der Wehrplatten 15 gebildet. Dies bringt den Vorteil mit sich, dass die vorteilhaften Eigenschaften eines derartigen Überlaufwehrs 21 an einer Wehrplatte 19 beibehalten werden.The support wall 25 is preferably aligned with the overflow edge at the radius R k of the weir plate 19. This advantageously ensures that the actual weir 21 is not changed in its position, it is still formed by the inner edge or overflow edge R k of the weir plates 15 , This has the advantage that the advantageous properties of such overflow weir 21 are maintained on a weir plate 19.

Es ist auch denkbar, dass die Stützwand 25 etwas radial nach außen relativ zur Stützwand versetzt ist, so dass die Verbindungslinie 31 radial etwas weiter außen, z.B. 0, 5 mm bis 3 mm weiter außen verläuft.It is also conceivable that the support wall 25 is offset slightly radially outwardly relative to the support wall, so that the connection line 31 radially further outwards, for example, 0, 5 mm to 3 mm further out.

Die Ablenkwand 27 bewirkt dagegen die eigentliche Ablenkung des austretenden Produktstroms bzw. das Aufprägen eines Dralls in Umfangsrichtung, verändert aber die Lage des Wehres bzw. der Überlaufkante nicht. Die Ablenkwand 27 bewirkt lediglich, dass die Flüssigkeit, welche das Überlaufwehr überströmt hat, aus der Axialrichtung umgelenkt wird. Derart wird ein Ablenken des Flüssigkeitsstrahls im Wesentlichen in Umfangsrichtung erreicht, was insgesamt in einer Energieeinsparung gegenüber einem Flüssigkeitsaustritt in Axialrichtung resultiert.In contrast, the baffle 27 causes the actual deflection of the exiting product flow or the imposition of a twist in the circumferential direction, but does not change the position of the weir or the overflow edge. The baffle 27 merely causes the liquid, which has flowed over the overflow weir, is deflected from the axial direction. Thus, a deflection of the liquid jet is achieved substantially in the circumferential direction, resulting in an overall energy savings over a liquid leakage in the axial direction.

Um dies zu erreichen, ist es vorteilhaft, wenn die Ablenkwand einen bogenförmigen Wandabschnitt 27a aufweist und einen sich daran anschließenden ebenen Wandabschnitt 27b.To achieve this, it is advantageous if the baffle has an arcuate wall portion 27a and a subsequent planar wall portion 27b.

Der bogenförmige Abschnitt 27a bewirkt eine Umlenkung der in Axialrichtung X aus der Trommel 3 fließenden Flüssigkeitsphase in Umfangsrichtung bzw. das Aufprägen eines Dralls in Umfangsrichtung (gegen die Drehrichtung). Der ebene Wandabschnitt 27b leitet den Produktstrom ein Stück in dieser Richtung weiter. Vorzugsweise ist der bogenförmige Abschnitt 27a derart bemessen, dass im Wesentlichen hier die Umlenkung des Produktstroms aus der Axialrichtung X gegen die Drehrichtung U erfolgt, so dass ein Rückstoßeffekt entsteht, welcher in einer Energieeinsparung bzw. Energierückgewinnung resultiert.The arcuate portion 27a causes a deflection of the liquid phase flowing in the axial direction X from the drum 3 in the circumferential direction or the imposition of a twist in the circumferential direction (against the direction of rotation). The flat wall portion 27b forwards the product flow one piece in this direction. Preferably, the arcuate portion 27a is dimensioned such that substantially the deflection of the product flow from the axial direction X takes place here against the direction of rotation U, so that a recoil effect results, which results in an energy saving or energy recovery.

Der gewählte Umlenkwinkel α - welcher der Ausrichtung des ebenen Wandabschnittes relativ zur Axialrichtung entspricht - ist bevorzugt kleiner als 90°, vorzugsweise beträgt der Umlenkwinkel α ca. 70 bis 85°. Indem der Umlenkwinkel α vorzugsweise kleiner ist als 90°, wird auf einfache Weise sichergestellt, dass nicht zu viel an aus der Trommel 1 abströmender bzw. austretender Flüssigkeit derart weit aus der Axialrichtung umgelenkt wird, dass die Flüssigkeit wieder gegen die Außenseite des Trommeldeckels 17 spritzt, was wiederum einen gewissen Energieverlust bedeuten würde.The selected deflection angle α - which corresponds to the orientation of the planar wall section relative to the axial direction - is preferably less than 90 °, preferably the deflection angle α is approximately 70 to 85 °. By the deflection angle α is preferably smaller than 90 °, it is ensured in a simple manner that not too much of the drum 1 flowing out or exiting liquid is deflected so far from the axial direction that the liquid splashes against the outside of the drum cover 17 again which would mean a certain loss of energy.

Besonders vorteilhaft ist, dass die Ablenkwand 27 jedenfalls teilweise direkt in axialer Verlängerung außen vor der Durchlassöffnung liegt und diese axial auf dem Radius der Durchlassöffnung ganz oder teilweise abdeckt.It is particularly advantageous that the baffle 27 at least partially lies directly in the axial extension outside the passage opening and this covers completely or partially axially on the radius of the passage opening.

Derart wird gegenüber der gattungsgemäßen JP 11 - 179236 der Vorteil erreicht, dass ein größerer Anteil der ausströmenden Flüssigkeit bereits auf dem geringeren Radius der Durchlassöffnung in Umfangsrichtung umgelenkt wird, so dass eine größere Energieeinsparung erreicht wird als in dieser Schrift, nach welcher die Umlenkung stets auf einem größeren Radius erfolgt. Andererseits wird durch die Erfindung sichergestellt, dass sich die radiale Lage des eigentlichen Wehrs nicht verändert sondern nach wie vor durch die Kante der Wehrplatten definiert wird.Such will be compared to the generic JP 11-179236 achieves the advantage that a larger proportion of the outflowing liquid is already deflected in the circumferential direction at the smaller radius of the passage opening, so that a greater energy saving is achieved than in this document, after which the deflection always takes place over a larger radius. On the other hand, it is ensured by the invention that the radial position of the actual weir is not changed but is still defined by the edge of the weir plates.

Es ist besonders vorteilhaft, wenn die Wehrplatte 17 und die Ablenkeinrichtung 23 stoffschlüssig miteinander verbunden sind und derart eine bauliche Einheit bilden.It is particularly advantageous if the weir plate 17 and the deflector 23 are materially interconnected and thus form a structural unit.

Vorzugsweise sind die Wehrplatten 17 und die daran angebrachte Ablenkeinrichtung 23 gemeinsam radial verstellbar, z.B. mit Hilfe von Schrauben (nicht dargestellt), mit denen die Wehrplatten 19 jeweils an den Trommeldeckel 17 geschraubt werden. Dabei sind an den Wehrplatten jeweils vorzugsweise mehrere Schraubbohrungen 29 radial zueinander versetzt verteilt, so dass durch eine geeignete Wahl der Schraubbohrungen 29 auf einfache Weise die radiale Position der Wehrplatten 19 am Trommeldeckel 17 einstellbar ist.Preferably, the weir plates 17 and the deflector 23 mounted thereon are radially adjustable together, e.g. by means of screws (not shown), with which the weir plates 19 are screwed to the drum cover 17 respectively. In this case, a plurality of screw holes 29 are preferably distributed radially offset from each other on the weir plates, so that by a suitable choice of screw holes 29 in a simple manner, the radial position of the weir plates 19 on the drum cover 17 is adjustable.

Besonders vorteilhaft ist, dass sich die erfindungsgemäße Konstruktion gut reinigen lässt. Durch das Beibehalten der Lage des Überlaufwehrs 21 wird vermieden, dass sich ein Raum bildet, in welchem sich leicht Verschmutzungen absetzen können.It is particularly advantageous that the construction according to the invention can be cleaned well. By maintaining the position of the overflow weir 21 is avoided that forms a space in which easily soiling can settle.

Bezugszeichenreference numeral

Vollmantel-SchneckenzentrifugeSolid bowl centrifuge
11
Trommeldrum
33
Schneckeslug
55
Einlaufrohrinlet pipe
77
Verteilerdistributor
99
Schleuderraumcentrifugal chamber
1111
Feststoffaustragsolids
1313
DurchlassöffnungenPassage openings
1515
Trommeldeckeldrum lid
1717
Wehrplatteweir plate
1919
ÜberlaufwehrOverflow weir
2121
AblenkeinrichtungDeflector
2323
Stützwandretaining wall
2525
Ablenkwandbaffle
2727
Bohrungendrilling
2929
Drehachseaxis of rotation
DD
Radiusradius
Rk R k

Claims (10)

  1. A solid-wall screw centrifuge, comprising at least one discharge for discharging clarified fluid from a drum (3) which comprises at least one or several passages (15) in a drum cover (17), which is or are respectively associated with a weir plate (19), which respectively form an overflow weir (21) on their radial inner edge, with further at least one deflecting device (23) being arranged on the outside on the drum cover (17), which deflecting device is arranged in such a way that an exiting fluid flow is deflected in the circumferential direction or subjected to a twist in the circumferential direction, characterized in that the at least one deflecting device (23) is arranged in such a way that by maintaining the overflow weir (21) the escaping fluid flow is deflected in the circumferential direction at the overflow edge of the at least one weir plate (19), directly in the axial extension of the region of the passage opening (15) which is not covered by the respective weir plate.
  2. A solid-wall screw centrifuge according to claim 1, characterized in that the deflecting device (23) is disposed in any case partly directly in axial extension on the outside before the passage opening on its radius and axially fully or partly covers said opening directly in axial extension of the region not covered by the respective weir plate.
  3. A solid-wall screw centrifuge according to claim 1, characterized in that one deflecting device (23) is respectively attached to several, preferably all, of the weir plates (19).
  4. A solid-wall screw centrifuge according to claim 1 or 2, characterized in that the at least one deflecting device (23) respectively comprises a support wall (25) and a deflecting wall (27) which is aligned angularly in relation to said support wall.
  5. A solid-wall screw centrifuge according to claim 3, characterized in that the support wall (25) is arranged as an axial wall section, and that the deflecting wall (27) is arranged at a right angle to the support wall (25).
  6. A solid-wall screw centrifuge according to one of the preceding claims, characterized in that the support wall (25) is in alignment with the overflow edge on the radius Rk of the weir plate (19) forming the overflow weir (21).
  7. A solid-wall screw centrifuge according to one of the preceding claims, characterized in that the deflecting wall (27) comprises an arc-shaped wall section (27a).
  8. A solid-wall screw centrifuge according to claim 7, characterized in that the deflecting wall (27) further comprises a flat wall section (27b) adjacent to the arc-shaped wall section (27a).
  9. A solid-wall screw centrifuge according to claim 8, characterized in that the arc-shaped section (27a) is arranged in such a way that it produces a deflection of the fluid phase flowing in the axial direction X from the drum 3 substantially into the circumferential direction.
  10. A solid-wall screw centrifuge according to one of the claims 7 or 8, characterized in that the arc-shaped section (27a) is dimensioned in such a way that a deflection of the product flow occurs from the axial direction X against the rotational direction U about a deflecting angle α which is smaller than 90° or equal to 90°, and is preferably approx. 70 to 85°.
EP11735650.1A 2010-07-28 2011-07-25 Solid bowl screw centrifuge having an overflow weir Active EP2598251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010032503A DE102010032503A1 (en) 2010-07-28 2010-07-28 Solid bowl centrifuge with overflow weir
PCT/EP2011/062722 WO2012013624A2 (en) 2010-07-28 2011-07-25 Fully jacketed screw centrifuge having an overflow weir

Publications (2)

Publication Number Publication Date
EP2598251A2 EP2598251A2 (en) 2013-06-05
EP2598251B1 true EP2598251B1 (en) 2016-11-02

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EP11735650.1A Active EP2598251B1 (en) 2010-07-28 2011-07-25 Solid bowl screw centrifuge having an overflow weir

Country Status (8)

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US (1) US9333514B2 (en)
EP (1) EP2598251B1 (en)
CN (1) CN102958615B (en)
BR (1) BR112013003655B1 (en)
DE (1) DE102010032503A1 (en)
DK (1) DK2598251T3 (en)
SG (1) SG185472A1 (en)
WO (1) WO2012013624A2 (en)

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DK176946B1 (en) * 2007-05-09 2010-06-14 Alfa Laval Corp Ab Centrifugal separator and a liquid phase drain port element
BRPI0917414A2 (en) * 2008-08-15 2015-12-01 M Il L C centrifuge
DK200801848A (en) * 2008-12-30 2010-07-01 Alfa Laval Corp Ab A decanter centrifuge and a decanter centrifuge discharge port memeber.
DE102012106226A1 (en) 2012-07-11 2014-01-16 Gea Mechanical Equipment Gmbh Solid bowl centrifuge with overflow weir
DE102012014563B4 (en) 2012-07-23 2014-12-11 Flottweg Se Solid bowl screw centrifuge with an energy recovery device
JP5220950B1 (en) * 2012-11-02 2013-06-26 巴工業株式会社 Centrifugal separator with separation liquid injection nozzle
DE102013001436A1 (en) 2013-01-29 2014-07-31 Flottweg Se Solid bowl centrifuge with a weir edge
EP2789395B2 (en) 2013-04-08 2019-11-06 Flottweg SE Solid bowl screw centrifuge with an energy recovery device
GB2513358A (en) * 2013-04-24 2014-10-29 Nat Oilwell Varco Lp A centrifuge and a control system therefor
DE102014108722A1 (en) 2014-04-30 2015-11-05 Hiller Gmbh screw centrifuge
DK3398687T3 (en) * 2017-05-04 2020-04-20 Andritz Sas decanter centrifuge
DE102017130904B4 (en) * 2017-12-21 2019-07-11 Flottweg Se Outlet device of a solid bowl screw centrifuge with a deflection chute
FR3121061B1 (en) 2021-03-26 2023-08-04 Safran Aircraft Engines METHOD FOR MANUFACTURING A METAL ALLOY PART FOR A TURBOMACHINE

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US5147277A (en) 1991-03-19 1992-09-15 Baker Hughes Incorporated Power-efficient liquid-solid separating centrifuge
JPH11197547A (en) 1998-01-13 1999-07-27 Kubota Corp Device of discharging separated water in a horizontal type centrifugal separator
WO2010076750A1 (en) 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body

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DE3900415A1 (en) 1989-01-09 1990-07-12 Teves Gmbh Alfred Partial vacuum brake booster
JP3543597B2 (en) 1997-12-22 2004-07-14 株式会社クボタ Separation water discharge device in horizontal centrifuge
JPH11197548A (en) * 1998-01-13 1999-07-27 Kubota Corp Discharge device of separated water in a horizontal type centrifugal separator
DE10203652B4 (en) 2002-01-30 2006-10-19 Westfalia Separator Ag Solid bowl centrifuge with a weir
US20040072668A1 (en) 2002-10-15 2004-04-15 Baker Hughes Incorporated Liquid phase discharge port incorporating chamber nozzle device for centrifuge
DK176946B1 (en) * 2007-05-09 2010-06-14 Alfa Laval Corp Ab Centrifugal separator and a liquid phase drain port element

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Publication number Priority date Publication date Assignee Title
US5147277A (en) 1991-03-19 1992-09-15 Baker Hughes Incorporated Power-efficient liquid-solid separating centrifuge
JPH11197547A (en) 1998-01-13 1999-07-27 Kubota Corp Device of discharging separated water in a horizontal type centrifugal separator
WO2010076750A1 (en) 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body

Also Published As

Publication number Publication date
SG185472A1 (en) 2012-12-28
CN102958615B (en) 2014-12-10
BR112013003655A2 (en) 2016-09-06
EP2598251A2 (en) 2013-06-05
WO2012013624A3 (en) 2012-03-29
DK2598251T3 (en) 2017-02-13
WO2012013624A2 (en) 2012-02-02
US20140051565A1 (en) 2014-02-20
BR112013003655B1 (en) 2020-12-08
US9333514B2 (en) 2016-05-10
DE102010032503A1 (en) 2012-02-02
CN102958615A (en) 2013-03-06

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