EP1280606A1 - Solid bowl centrifuge for separating mixtures of liquids and solids - Google Patents

Solid bowl centrifuge for separating mixtures of liquids and solids

Info

Publication number
EP1280606A1
EP1280606A1 EP01936331A EP01936331A EP1280606A1 EP 1280606 A1 EP1280606 A1 EP 1280606A1 EP 01936331 A EP01936331 A EP 01936331A EP 01936331 A EP01936331 A EP 01936331A EP 1280606 A1 EP1280606 A1 EP 1280606A1
Authority
EP
European Patent Office
Prior art keywords
centrifuge
liquid
drum
ring cup
weir
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.)
Granted
Application number
EP01936331A
Other languages
German (de)
French (fr)
Other versions
EP1280606B1 (en
Inventor
Bernward Feldkamp
Reinhold Schilp
Ralf MÜLLER
Manfred Seifert
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.)
Baker Hughes Deutschland GmbH
Original Assignee
Baker Hughes Deutschland 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 Baker Hughes Deutschland GmbH filed Critical Baker Hughes Deutschland GmbH
Publication of EP1280606A1 publication Critical patent/EP1280606A1/en
Application granted granted Critical
Publication of EP1280606B1 publication Critical patent/EP1280606B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • 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
    • 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 centrifuge for separating solid-liquid mixtures with thick material discharge openings arranged in the drum shell at one end region and with liquid drain openings arranged in the end wall at the other end region of the centrifuge drum and with a weir that can be adjusted or adjusted from outside the centrifuge drum Changing the liquid level in the centrifuge drum during centrifuge operation.
  • Known solid bowl centrifuges of this type are mostly designed as screw centrifuges, in which a conveyor screw rotates in the drum shell at a speed deviating from the drum speed to transport solids.
  • a centrifugal force forms a liquid ring inside the drum, the inside diameter of which the radial arrangement of the liquid discharge openings, which are evenly distributed around the circumference of the drum end wall, or of the height of radially adjustable weir disks is determined, by means of whose adjustment the liquid level or the pond depth in the centrifuge drum can be changed.
  • a weir is known from DE-A-39 21 327 which consists of elements such as flaps, There are slides, wedges, etc., which are arranged in the region of the centrate drain openings distributed around the circumference of the drum end wall and which rotate with the drum.
  • the rotating adjusting elements are connected via mechanical connecting elements with the non-rotating adjusting device such as.
  • Such a weir system has not established itself in solid bowl centrifuges.
  • a solid bowl centrifuge with a controllable weir for the discharge of the liquid phase is known.
  • a stationary but axially displaceable throttle disc is arranged outside the drum opposite the drain openings for the liquid phase.
  • the throttle disk presses the liquid outflow from the weir openings directly against the rotating drum front wall, i.e. H. the throttle disc exerts a braking effect on the centrifuge drum - similar to an eddy current brake - which must be compensated for by an increased drive power of the centrifuge.
  • the invention has for its object to provide a solid bowl centrifuge with a simply constructed continuously adjustable liquid To create a weir with which the liquid level in the centrifuge drum can be controlled and regulated reliably and with the lowest possible energy consumption during centrifuge operation.
  • the adjustable weir consists of a connected to the centrifuge housing and the liquid Drain openings of the drum from the outside with a fixed covering, d. H. not co-rotating, but also not axially displaceable ring cup into which the centrate liquid initially runs freely out of the outlet openings on the drum-side wall.
  • the liquid then emerges from the ring cup through at least one passage opening arranged on the ring circumference, the size of which can be changed by an adjusting device, with a comparatively low circumferential speed into the liquid collecting chamber of the centrifuge housing.
  • An energy-consuming post-acceleration of the centrate liquid on the outer side of the drum front does not occur.
  • the liquid level in the fixed, non-rotating ring cup determines the liquid level in the centrifuge drum.
  • the adjusting device for adjusting the liquid level in the ring cup and thus also in the centrifuge drum can be made according to a further feature of the invention from a concentric
  • Ring cup arranged ring-shaped pinhole consist of the by their twisting the free cross-section of the passage opening (s) of the ring cup more or less covers.
  • the annular perforated diaphragm can also be arranged such that the axial cross-section of the free cross-section of the passage opening (s) of the ring cup is more or less covered.
  • the adjusting device can also consist of an adjusting drive, which engages with a sliding bolt on an edge region of the ring cup, while the opposite ring cup edge is articulated on the centrifuge housing, so that the ring cup is displaced into an obliquely widening oblique position by shifting the sliding bolt Outlet slot is positionable.
  • FIG. 1 shows a section of the longitudinal section through a full-jacket centrifuge according to the invention with the controllable weir for setting the liquid level in the centrifuge drum,
  • Fig. 2 excerpts of the centrifuge of Fig. 1 with a variant of the controllable weir
  • FIG 3 shows a section of the longitudinal section through such a centrifuge with a weir with an oblique annular gap or an oblique outlet slot as a further variant of the controllable weir.
  • the screw centrifuge of all figures has a rotatably mounted drum casing 10, within which a screw conveyor 11 is coaxially rotatably mounted, which rotates in the drum in the same direction of rotation, but with a rotational speed that differs from the drum speed. number rotates.
  • the solid-liquid mixture 12 to be thickened or to be dewatered (FIG. 3), such as, for. B. Sewage sludge is introduced into the centrifuge drum 10 via the screw carrier.
  • the controllable weir for the discharge of the centrate consists of a fixed, ie non-rotating ring cup 20 connected to the left side of the centrifuge housing 18 and covering the liquid drain openings 13 of the centrifuge drum 10 from the outside at a distance 19, which is at least one by a ring ring
  • the adjusting device has a passage opening 19 or 21 which can be changed in size and through which the centrate exits into the collecting chamber 15.
  • the diameter of the non-rotating ring cup 20 corresponds approximately to the diameter of the circle that surrounds all the centrate drain openings 13 of the centrifuge drum 10.
  • the centrate drain openings 13 can be equipped with weir disks 22 on their outer periphery.
  • the adjustment device for the controllable weir consists of an annular perforated aperture 23 arranged concentrically to the ring cup 20, which, by means of its rotation by means of element 24, more or less covers the free cross section of the passage opening (s 21 of the ring cup 20, according to FIG 2 the adjustment device from an annular perforated diaphragm 25 which is arranged concentrically to the ring cup 20 and which, due to its axial displacement by means of the organ 26, more or less covers the free cross-section of the passage opening / s 21 of the ring cup 20.
  • the ring cup 20 and the perforated plate are 23 and 25 respectively attached to the centrifuge housing wall 18.
  • the actuator 24 or 26 can be actuated, for example, by a hydraulic cylinder, pneumatic cylinder, actuator, threaded bushing, etc.
  • the ring cup 20 can be brought into a deviating from the vertical tilt or inclined position that the ring cup 20 at an edge area, for. B. is articulated on the lower edge area to at least one joint 27 and on the opposite edge area engages via a further joint 28 a sliding bolt 29 which is axially displaceable by an actuator 30.
  • the ring cup 20 can be positioned in an inclined position, so that a corresponding obliquely widening annular gap or outlet slot 19 is created, through which the centrate exits the ring cup 20 at a greatly reduced peripheral speed into the collecting chamber 15 of the centrifuge housing.
  • the passage capacity of the widening outlet slot 19 over the entire slot circumference is greater than with a few weir openings.
  • the oblique centrate outlet slot 19 widens downward in the direction of the centrate outlet chute, which also achieves self-cleaning of the outlet slot 19, ie the risk that the outlet slot could become clogged with solids that are still contained in the centrate is minimized .
  • a braking effect exerted by the ring cup 20 on the drum end wall 14 and material wear are minimized.
  • the actuator for automatic control of the weir i.e. H. to adjust the effective width of the outlet slot 19 or 21 assigned to the ring cup 20, etc.
  • the actuator for automatic control of the weir i.e. H. to adjust the effective width of the outlet slot 19 or 21 assigned to the ring cup 20, etc.
  • the actuator for automatic control of the weir i.e. H. to adjust the effective width of the outlet slot 19 or 21 assigned to the ring cup 20, etc.
  • the actuator for automatic control of the weir i.e. H. to adjust the effective width of the outlet slot 19 or 21 assigned to the ring cup 20, etc.
  • the automatically controllable weir according to the invention can be used in screw centrifuges with and without a baffle plate (negative / positive pool), and already installed centrifuges can be retrofitted with the automatically controllable weir.

Abstract

In order to separate solid-liquid mixtures in a solid bowl centrifuge containing a simply designed, adjustable weir for draining the liquid which makes it possible to control or adjust the level of the liquid in the centrifuge basket (10) during the operation of the centrifuge with the least possible expenditure of energy, the invention proposes to realize the adjustable weir in the form of a stationary, i.e., non-rotating, annular cup (20) that is connected to the centrifuge housing (18) and covers the liquid drain openings (13) of the basket (10) from the outside at a certain distance, wherein the annular cup contains at least one through-opening on its circumference, the size of which can be varied, and where the liquid drains into the liquid collection chamber (15) of the centrifuge housing through the aforementioned through-opening.

Description

Vollmantelzentrifuge zur Trennung von Feststoff-Flüssigkeitsgemischen Solid bowl centrifuge for the separation of solid-liquid mixtures
B E S C H R E I B U N GDESCRIPTION
Die Erfindung betrifft eine Vollmantelzentrifuge zur Trennung von Feststoff-Flüssigkeitsgemischen mit im Trommelmantel an einem Endbereich angeordneten Dickstoff-Austragsöffnungen und mit in der Stirnwandung am anderen Endbereich der Zentrifugentrommel ange- ordneten Flüssigkeits-Ablauföffnungen und mit einem von außerhalb der Zentrifugentrommel her verstellbaren Wehr zum Einstellen bzw. Verändern des Flüssigkeitsstandes in der Zentrifugentrommel während des Zentrifugenbetriebes.The invention relates to a solid-bowl centrifuge for separating solid-liquid mixtures with thick material discharge openings arranged in the drum shell at one end region and with liquid drain openings arranged in the end wall at the other end region of the centrifuge drum and with a weir that can be adjusted or adjusted from outside the centrifuge drum Changing the liquid level in the centrifuge drum during centrifuge operation.
Derartige bekannte Vollmantelzentrifugen sind meistens als Schnek- kenzentrifugen ausgebildet, bei denen im Trommelmantel mit von der Trommeldrehzahl abweichender Drehzahl eine Förderschnecke zum Feststofftransport rotiert. Im Betrieb bildet sich unter der Einwirkung der Zentrifugalkraft innerhalb der Trommel ein Flüssigkeitsring aus, dessen Innendurchmesser der radialen Anordnung der um den Umfang der Trommelstirnwand gleichmäßig verteilten Flüssigkeits- Ablauföffnungen bzw. von der Höhe radial einstellbarer Wehrscheiben bestimmt ist, durch deren Verstellung das Flüssigkeitsniveau bzw. die Teichtiefe in der Zentrifugentrommel verändert werden kann.Known solid bowl centrifuges of this type are mostly designed as screw centrifuges, in which a conveyor screw rotates in the drum shell at a speed deviating from the drum speed to transport solids. During operation, a centrifugal force forms a liquid ring inside the drum, the inside diameter of which the radial arrangement of the liquid discharge openings, which are evenly distributed around the circumference of the drum end wall, or of the height of radially adjustable weir disks is determined, by means of whose adjustment the liquid level or the pond depth in the centrifuge drum can be changed.
Es ist schon vorgeschlagen worden, bei Vollmantelzentrifugen das Wehr zur Einstellung des Flüssigkeitsstandes in der Zentrifugentrommel während des Zentrifugenbetriebes durch eine außerhalb der Trommel angeordnete Verstelleinrichtung zu steuern. So ist aus der DE-A-39 21 327 ein Wehr bekannt, das aus Elementen wie Klappen, Schieber, Keile etc. besteht, die im Bereich der um den Umfang der Trommelstirnwand verteilten Zentratablauföffnungen angeordnet sind und die mit der Trommel mitrotieren. Die mitrotierenden Verstellelemente stehen über mechanische Verbindungselemente mit der nicht mitrotierenden Verstelleinrichtung wie z. B. einem axial verstellbaren zentralen Stellring in Wirkverbindung, durch dessen Stellung während des Zentrifugenbetriebes Einfluß auf die Zentratabflußmenge bzw. auf den Zentratabflußwiderstand und damit auf den Flüssigkeitsstand in der Zentrifugentrommel genommen werden kann. Ein solches Wehrsystem hat sich bei Vollmantelzentrifugen aber nicht durchgesetzt.It has already been proposed to control the weir for adjusting the liquid level in the centrifuge drum during centrifuge operation by means of an adjusting device arranged outside the drum. A weir is known from DE-A-39 21 327 which consists of elements such as flaps, There are slides, wedges, etc., which are arranged in the region of the centrate drain openings distributed around the circumference of the drum end wall and which rotate with the drum. The rotating adjusting elements are connected via mechanical connecting elements with the non-rotating adjusting device such as. B. an axially adjustable central collar in operative connection, by its position during centrifuge operation influence on the centrate flow rate or on the centrate flow resistance and thus on the liquid level in the centrifuge drum can be taken. Such a weir system has not established itself in solid bowl centrifuges.
Ferner ist aus der DE-A-43 20 265 eine Vollmantelzentrifuge mit einem regelbaren Wehr für den Ablauf der Flüssigphase bekannt. Dabei ist außerhalb der Trommel den Ablauföffnungen für die Flüssigphase gegenüberliegend eine stillstehende, aber axial verschiebbare Drosselscheibe angeordnet. Dabei bestimmt der freie Querschnitt zwischen den mit der Trommel mitrotierenden Zentratab- schleuderöffnungen und der achsparallel und planparallel verschieb- baren Drosselscheibe den Abflußquerschnitt für die Flüssigkeit und auch deren Standhöhe in der Trommel. Abgesehen davon, daß die Einrichtung zur achsparallelen Führung und Verschiebung der zur Trommelstirnwand planparallelen stillstehenden Drosselscheibe nicht außerhalb des Naß- und Schmutzteils der Zentrifuge angeordnet ist, drückt die Drosselscheibe den Flüssigkeitsausfluß aus den Wehröffnungen direkt gegen die rotierende Trommelstirnwand, d. h. die Drosselscheibe übt auf die Zentrifugentrommel - ähnlich wie bei einer Wirbelstrombremse - eine Bremswirkung aus, was durch eine erhöhte Antriebsleistung der Zentrifuge kompensiert werden muß.Furthermore, from DE-A-43 20 265 a solid bowl centrifuge with a controllable weir for the discharge of the liquid phase is known. A stationary but axially displaceable throttle disc is arranged outside the drum opposite the drain openings for the liquid phase. The free cross-section between the centrifuge centrifuge orifices rotating with the drum and the throttle disk, which can be displaced parallel and plane-parallel, determines the discharge cross-section for the liquid and also its standing height in the drum. Apart from the fact that the device for axially parallel guidance and displacement of the stationary throttle disk, which is plane-parallel to the drum front wall, is not arranged outside the wet and dirty part of the centrifuge, the throttle disk presses the liquid outflow from the weir openings directly against the rotating drum front wall, i.e. H. the throttle disc exerts a braking effect on the centrifuge drum - similar to an eddy current brake - which must be compensated for by an increased drive power of the centrifuge.
Der Erfindung liegt die Aufgabe zugrunde, eine Vollmantelzentrifuge mit einem einfach gebauten stufenlos verstellbaren Flüssigkeitsab- lauf-Wehr zu schaffen, mit dem das Flüssigkeitsniveau in der Zentrifugentrommel betriebssicher und bei kleinstmöglichem Energieaufwand während des Zentrifugenbetriebes gesteuert bzw. geregelt werden kann.The invention has for its object to provide a solid bowl centrifuge with a simply constructed continuously adjustable liquid To create a weir with which the liquid level in the centrifuge drum can be controlled and regulated reliably and with the lowest possible energy consumption during centrifuge operation.
Diese Aufgabe wird erfindungsgemäß mit einer Zentrifuge mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.This object is achieved with a centrifuge with the features of claim 1. Advantageous embodiments of the invention are specified in the subclaims.
Charakteristisch für die erfindungsgemäße Zentrifuge ist, daß die von den Feststoffen befreite Zentratflüssigkeit nach Verlassen der Trommelstirnwandöffnungen bzw. des Wehrs nicht mit hoher Geschwindigkeit unmittelbar in das Zentrifugengehäuse abgeschleudert wird, sondern das verstellbare Wehr besteht aus einer mit dem Zentrifugenge- häuse verbundenen und die Flüssigkeits-Ablauföffnungen der Trommel von außen mit Abstand abdeckenden feststehenden, d. h. nicht mitrotierenden, aber auch nicht axial zu verschiebenden Ringtasse, in welche die Zentratflüssigkeit aus den trommelstimwandseitigen Ablauföffnungen zunächst frei ausläuft. Aus der Ringtasse tritt dann die Flüssigkeit durch wenigstens eine am Ringumfang angeordnete Durchtrittsöffnung, deren Größe durch eine Verstelleinrichtung veränderbar ist, mit vergleichsweise geringer Umfangsgeschwindigkeit in die Flüssigkeits-Auffangkammer des Zentrifugengehäuses aus. Eine energieaufzehrende Nachbeschleunigung der Zentratflüssigkeit an der äußeren Trommelstirnwandseite tritt dabei nicht auf. Dabei bestimmt der Flüssigkeitsstand in der feststehenden, nicht mitrotierenden Ringtasse den Flüssigkeitsstand in der Zentrifugentrommel.It is characteristic of the centrifuge according to the invention that the centrate liquid freed of the solids is not thrown directly into the centrifuge housing at high speed after leaving the drum front wall openings or the weir, but the adjustable weir consists of a connected to the centrifuge housing and the liquid Drain openings of the drum from the outside with a fixed covering, d. H. not co-rotating, but also not axially displaceable ring cup into which the centrate liquid initially runs freely out of the outlet openings on the drum-side wall. The liquid then emerges from the ring cup through at least one passage opening arranged on the ring circumference, the size of which can be changed by an adjusting device, with a comparatively low circumferential speed into the liquid collecting chamber of the centrifuge housing. An energy-consuming post-acceleration of the centrate liquid on the outer side of the drum front does not occur. The liquid level in the fixed, non-rotating ring cup determines the liquid level in the centrifuge drum.
Die Verstelleinrichtung zur Einstellung des Flüssigkeitsstandes in der Ringtasse und damit auch in der Zentrifugentrommel kann nach einem weiteren Merkmal der Erfindung aus einer konzentrisch zurThe adjusting device for adjusting the liquid level in the ring cup and thus also in the centrifuge drum can be made according to a further feature of the invention from a concentric
Ringtasse angeordneten ringförmigen Lochblende bestehen, die durch ihre Verdrehung den freien Querschnitt der Durchtrittsöffnung/en der Ringtasse mehr oder weniger weit abdeckt. Die ringförmige Lochblende kann aber auch so angeordnet sein, daß durch ihre Axialverschiebung der freie Querschnitt der Durchtrittsöffnung/en der Ringtasse mehr oder weniger weit abgedeckt wird. Die Verstelleinrichtung kann auch aus einem VerStellantrieb bestehen, der mit einem Verschiebebolzen an einem Randbereich der Ringtasse angreift, während der gegenüberliegende Ringtassenrand am Zentrifugengehäuse angelenkt ist, so daß durch Verschiebung des Verschie- bebolzens die Ringtasse in eine von der Vertikalen abweichende Schräglage mit sich schräg erweiterndem Auslaufschlitz positionierbar ist.Ring cup arranged ring-shaped pinhole consist of the by their twisting the free cross-section of the passage opening (s) of the ring cup more or less covers. However, the annular perforated diaphragm can also be arranged such that the axial cross-section of the free cross-section of the passage opening (s) of the ring cup is more or less covered. The adjusting device can also consist of an adjusting drive, which engages with a sliding bolt on an edge region of the ring cup, while the opposite ring cup edge is articulated on the centrifuge housing, so that the ring cup is displaced into an obliquely widening oblique position by shifting the sliding bolt Outlet slot is positionable.
Die Erfindung und deren weiteren Merkmale und Vorteile werden an- hand der in den Figuren schematisch dargestellten Ausführungsbeispiele näher erläutert. Es zeigt:The invention and its further features and advantages are explained in more detail with reference to the exemplary embodiments shown schematically in the figures. It shows:
Fig. 1 ausschnittsweise den Längsschnitt durch eine erfindungsgemäße Vollmantelzentrifuge mit dem regelbaren Wehr für die Einstel- lung des Flüssigkeitsstandes in der Zentrifugentrommel,1 shows a section of the longitudinal section through a full-jacket centrifuge according to the invention with the controllable weir for setting the liquid level in the centrifuge drum,
Fig. 2 ausschnittsweise die Zentrifuge der Fig. 1 mit einer Variante des regelbaren Wehrs, undFig. 2 excerpts of the centrifuge of Fig. 1 with a variant of the controllable weir, and
Fig. 3 ausschnittsweise den Längsschnitt durch eine solche Zentrifuge mit einem Wehr mit schrägem Ringspalt bzw. schrägem Auslaufschlitz als weitere Variante des regelbaren Wehrs.3 shows a section of the longitudinal section through such a centrifuge with a weir with an oblique annular gap or an oblique outlet slot as a further variant of the controllable weir.
Die Schneckenzentrifuge aller Figuren weist einen drehbar gelagerten Trommelmantel 10 auf, innerhalb dessen koaxial eine Förderschnecke 1 1 drehbar gelagert ist, die in der Trommel in gleicher Drehrichtung, aber mit von der Trommeldrehzahl abweichender Dreh- zahl rotiert. Das einzudickende bzw. zu entwässernde Feststoff-Flüssigkeitsgemisch 12 (Fig. 3) wie z. B. Klärschlamm wird über den Schneckentragkörper in die Zentrifugentrommel 10 eingeleitet. Im Betrieb der Schneckenzentrifuge bildet sich unter der Einwirkung der Zentrifugalkraft innerhalb der Trommel 10 ein Flüssigkeitsring aus, wobei die an die Trommelwandung sedimentierten schweren Stoffe mit Hilfe der Förderschnecke 1 1 nach rechts transportiert, vom nicht dargestellten rechten konischen Trommelmantelteil aus der Suspensionsflüssigkeit ausgehoben und von der Förderschnecke zu den ebenfalls nicht dargestellten Feststoff- bzw. Dickstoff-Austragsöff- nungen gefördert werden, während die von den Feststoffen befreite Flüssigkeit (Zentrat) aus der Zentrifugentrommel 10 über Flüssigkeits-Ablauföffnungen 13 abläuft, die in der am linken Trommelende angebrachten Trommelstirnwand 14 gleichmäßig um den Umfang verteilt angeordnet sind. Das aus den Öffnungen 13 austretende Zentrat wird in einer Auffangkammer 15 des Zentrifugengehäuses 16 aufgefangen und von dort über eine Schurre 17 nach unten abgeleitet.The screw centrifuge of all figures has a rotatably mounted drum casing 10, within which a screw conveyor 11 is coaxially rotatably mounted, which rotates in the drum in the same direction of rotation, but with a rotational speed that differs from the drum speed. number rotates. The solid-liquid mixture 12 to be thickened or to be dewatered (FIG. 3), such as, for. B. Sewage sludge is introduced into the centrifuge drum 10 via the screw carrier. During operation of the screw centrifuge, a liquid ring forms under the action of the centrifugal force inside the drum 10, the heavy substances sedimented on the drum wall being transported to the right with the aid of the screw conveyor 11, lifted out of the suspension liquid by the right-hand conical drum shell part and not shown Conveyor screw are conveyed to the solid or thick material discharge openings, which are also not shown, while the liquid (centrate) freed from the solid runs out of the centrifuge drum 10 via liquid drain openings 13, which uniformly rotates around the drum end wall 14 attached to the left end of the drum the circumference is distributed. The centrate emerging from the openings 13 is collected in a collecting chamber 15 of the centrifuge housing 16 and from there is discharged downwards via a chute 17.
Das regelbare Wehr für den Ablauf des Zentrats besteht aus einer mit der linken Zentrifugengehäuse-Seitenwand 18 verbundenen und die Flüssigkeits-Ablauföffnungen 13 der Zentrifugentrommel 10 von außen mit Abstand 19 abdeckenden feststehenden, d. h. nicht mitrotierenden Ringtasse 20, die an ihrem Ringumfang wenigstens eine durch eine Verstelleinrichtung in ihrer Größe veränderbare Durchtrittsöffnung 19 bzw. 21 aufweist, durch welche das Zentrat in die Auffangkammer 15 austritt. Der Durchmesser der nicht mitrotierenden Ringtasse 20 entspricht etwa dem Durchmesser des Kreises, der alle Zentrat-Ablauföffnungen 13 der Zentrifugentrommel 10 umschließt. In Fig. 1 ist zu erkennen, daß die Zentrat-Ablauföffnungen 13 an ihrer Außenperipherie noch mit Wehrscheiben 22 ausgestattet sein können. Während nach Fig. 1 die Verstelleinrichtung für das regelbare Wehr aus einer konzentrisch zur Ringtasse 20 angeordneten ringförmigen Lochblende 23 besteht, die durch ihre Verdrehung mittels Organ 24 den freien Querschnitt der Durchtrittsöffnung(en 21 der Ringtasse 20 mehr oder weniger weit abdeckt, besteht nach Fig. 2 die Verstelleinrichtung aus einer konzentrisch zur Ringtasse 20 angeordneten ringförmigen Lochblende 25, die durch ihre Axialverschiebung mittels Organ 26 den freien Querschnitt der Durchtrittsöffnung/en 21 der Ring- tasse 20 mehr oder weniger weit abdeckt. Ringtasse 20 und Lochblende 23 bzw. 25 sind an der Zentrifugengehäusewand 18 befestigt. Das Stellorgan 24 bzw. 26 kann z. B. durch einen Hydraulikzylinder, Pneumatikzylinder, Stellmotor, Gewindebuchse etc. betätigt werden.The controllable weir for the discharge of the centrate consists of a fixed, ie non-rotating ring cup 20 connected to the left side of the centrifuge housing 18 and covering the liquid drain openings 13 of the centrifuge drum 10 from the outside at a distance 19, which is at least one by a ring ring The adjusting device has a passage opening 19 or 21 which can be changed in size and through which the centrate exits into the collecting chamber 15. The diameter of the non-rotating ring cup 20 corresponds approximately to the diameter of the circle that surrounds all the centrate drain openings 13 of the centrifuge drum 10. In Fig. 1 it can be seen that the centrate drain openings 13 can be equipped with weir disks 22 on their outer periphery. 1, the adjustment device for the controllable weir consists of an annular perforated aperture 23 arranged concentrically to the ring cup 20, which, by means of its rotation by means of element 24, more or less covers the free cross section of the passage opening (s 21 of the ring cup 20, according to FIG 2 the adjustment device from an annular perforated diaphragm 25 which is arranged concentrically to the ring cup 20 and which, due to its axial displacement by means of the organ 26, more or less covers the free cross-section of the passage opening / s 21 of the ring cup 20. The ring cup 20 and the perforated plate are 23 and 25 respectively attached to the centrifuge housing wall 18. The actuator 24 or 26 can be actuated, for example, by a hydraulic cylinder, pneumatic cylinder, actuator, threaded bushing, etc.
Nach Fig. 3 kann die Ringtasse 20 dadurch in eine von der Vertikalen abweichende Kipp- bzw. Schrägstellung gebracht werden, daß die Ringtasse 20 an einem Randbereich, z. B. am unteren Randbereich an wenigstens einem Gelenk 27 angelenkt ist und am gegenüberliegenden Randbereich über ein weiteres Gelenk 28 ein Verschiebebol- zen 29 angreift, der von einem Stellantrieb 30 axial verschiebbar ist. Auf diese Weise ist die Ringtasse 20 in eine Schräglage positionierbar, so daß ein entsprechend schräger sich erweiternder Ringspalt bzw. Auslaufschlitz 19 entsteht, durch den das Zentrat aus der Ringtasse 20 mit stark reduzierter Umfangsgeschwindigkeit in die Auf- fangkammer 15 des Zentrifugengehäuses austritt. Die Durchlaß-Kapazität des sich erweiternden Auslaufschlitzes 19 am gesamten Schlitzumfang ist größer als bei einzelnen wenigen Wehröffnungen. Mit Vorteil erweitert sich der schräge Zentrat-Auslaufschlitz 19 nach unten in Richtung zur Zentratablaufschurre, womit auch eine Selbst- reinigung des Auslaufschlitzes 19 erreicht wird, d. h. die Gefahr, daß der Auslaufschlitz mit Feststoff verstopfen könnte, der noch im Zentrat enthalten ist, ist minimiert. Außerdem sind beim erfindungsgemäßen regelbaren Wehr eine von der Ringtasse 20 auf dei Trommelstirnwand 14 ausgeübte Bremswirkung sowie ein Materialverschleiß minimiert.According to Fig. 3, the ring cup 20 can be brought into a deviating from the vertical tilt or inclined position that the ring cup 20 at an edge area, for. B. is articulated on the lower edge area to at least one joint 27 and on the opposite edge area engages via a further joint 28 a sliding bolt 29 which is axially displaceable by an actuator 30. In this way, the ring cup 20 can be positioned in an inclined position, so that a corresponding obliquely widening annular gap or outlet slot 19 is created, through which the centrate exits the ring cup 20 at a greatly reduced peripheral speed into the collecting chamber 15 of the centrifuge housing. The passage capacity of the widening outlet slot 19 over the entire slot circumference is greater than with a few weir openings. Advantageously, the oblique centrate outlet slot 19 widens downward in the direction of the centrate outlet chute, which also achieves self-cleaning of the outlet slot 19, ie the risk that the outlet slot could become clogged with solids that are still contained in the centrate is minimized , In addition, in the controllable weir according to the invention, a braking effect exerted by the ring cup 20 on the drum end wall 14 and material wear are minimized.
Nach einem weiteren Merkmal der Erfindung kann das Stellorgan zur automatischen Regelung des Wehrs, d. h. zur Verstellung der wirksamen Breite des der Ringtasse 20 zugeordneten Auslaufschlitzes 19 bzw. 21 etc. mit Meßwertgebern verbunden sein zur Messung von Menge und/oder TS-Gehalt und/oder Zähigkeit des eingedickten Feststoffaustrages und/oder von Menge/Konzentration des Schlammzulaufes und/oder von Trübung des Zentratablaufes. Auf diese Weise kann z. B. der Trockensubstanzgehalt TS des aus der Zentrifuge ausgetragenen Dickstoffs durch Regeleingriff auf die Flüssigkeits- standhöhe in der Zentrifugentrommel 10 automatisch geregelt, z. B. auf einen konstanten Wert geregelt werden, wobei eine größere Auslaufschlitz-Durchtrittsöffnung an der Ringtasse 20 eine niedrigere Flüssigkeitsstandhöhe sowie einen höheren TS-Gehalt des ausgetragenen Dickstoffs ergibt, und umgekehrt. Die Differenzdrehzahl zwi- sehen Trommel 10 und Förderschnecke 1 1 muß dazu nicht geändert werden, so daß aufwendige Differenzdrehzahlantriebe entfallen können. Außerdem ist das erfindungsgemäße automatisch regelbare Wehr bei Schneckenzentrifugen mit und ohne Stauscheibe (negative/ positive pool) anwendbar, und bereits installierte Zentrifugen können mit dem erfindungsgemäßen automatisch regelbaren Wehr nachgerüstet werden. According to a further feature of the invention, the actuator for automatic control of the weir, i.e. H. to adjust the effective width of the outlet slot 19 or 21 assigned to the ring cup 20, etc., be connected to sensors for measuring the amount and / or TS content and / or toughness of the thickened solids discharge and / or the amount / concentration of the sludge inlet and / or of turbidity in the centrate drain. In this way, e.g. B. the dry matter content TS of the thick matter discharged from the centrifuge is automatically regulated by control intervention on the liquid level in the centrifuge drum 10, e.g. B. can be controlled to a constant value, with a larger outlet slot passage opening on the ring cup 20 results in a lower liquid level and a higher dry matter content of the discharged thick matter, and vice versa. The differential speed between see drum 10 and screw conveyor 1 1 does not have to be changed, so that complex differential speed drives can be omitted. In addition, the automatically controllable weir according to the invention can be used in screw centrifuges with and without a baffle plate (negative / positive pool), and already installed centrifuges can be retrofitted with the automatically controllable weir.

Claims

Vollmantelzentrifuge zur Trennung von Feststoff-FlüssigkeitsgemischenA N S P R Ü C H E Solid bowl centrifuge for the separation of solid-liquid mixturesA NSPR Ü CHE
1. Vollmantelzentrifuge zur Trennung von Feststoff-Flüssigkeitsgemischen mit im Trommelmantel (10) an einem Endbereich angeordneten Dickstoff-Austragsöffnungen und mit in der Stirnwandung (14) am anderen Endbereich der Zentrifugentrommel ange- ordneten Flüssigkeits-Ablauföffnungen (13) und mit einem von außerhalb der Zentrifugentrommel her verstellbaren Wehr zum Einstellen bzw. Verändern des Flüssigkeitsstandes in der Zentrifugentrommel (10) während des Zentrifugenbetriebes, dadurch gekennzeichnet, daß das verstellbare Wehr aus einer mit dem Zentrifugengehäuse (18) verbundenen und die Flüssigkeits-Ablauföffnungen (13) der Zentrifugentrommel (10) von außen mit Abstand abdeckenden feststehenden, d. h. nicht mitrotierenden Ringtasse (20) besteht, die an ihrem Ringumfang wenigstens eine durch eine Verstelleinrichtung (24, 26, 30) in ih- rer Größe veränderbare Durchtrittsöffnung aufweist, durch welche die Flüssigkeit in die Flüssigkeits-Auffangkammer (15) des Zentrifugengehäuses austritt.1. Solid bowl centrifuge for separating solid-liquid mixtures with thick material discharge openings arranged in the drum shell (10) at one end region and with liquid drain openings (13) arranged in the end wall (14) at the other end region of the centrifuge drum and with one from outside the Centrifuge drum adjustable weir for adjusting or changing the liquid level in the centrifuge drum (10) during centrifuge operation, characterized in that the adjustable weir consists of a liquid discharge openings (13) of the centrifuge drum (10) connected to the centrifuge housing (18) and from the outside with a fixed covering, d. H. there is a non-rotating ring cup (20), which has at least one passage opening of which the size can be changed by means of an adjusting device (24, 26, 30) through which the liquid exits into the liquid collecting chamber (15) of the centrifuge housing.
2. Zentrifuge nach Anspruch 1 , dadurch gekennzeichnet, daß der Durchmesser der feststehenden Ringtasse (20) etwa dem Durchmesser des Kreises entspricht, der alle Flüssigkeits-Ablauföffnungen (13) der Zentrifugentrommel (10) umschließt, und daß zwischen der freien Stirnseite der Ringtasse und der be- nachbarten Trommelstirnwandung ein freier Ringspalt (19) gebildet ist.2. Centrifuge according to claim 1, characterized in that the diameter of the fixed ring cup (20) corresponds approximately to the diameter of the circle which surrounds all liquid drain openings (13) of the centrifuge drum (10), and that between the free end face of the ring cup and the adjacent free end wall (19) is formed.
3. Zentrifuge nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß die wenigstens eine an der feststehenden Ringtasse (20) angeordnete Flüssigkeits-Durchtrittsöffnung (19) aus einem sich insbesondere nach unten erweiternden schrägen Ringspalt bzw. Auslaufschlitz besteht.3. Centrifuge according to claims 1 or 2, characterized in that the at least one on the fixed ring cup (20) arranged liquid passage opening (19) consists of an in particular downwardly widening oblique annular gap or outlet slot.
4. Zentrifuge nach Anspruch 1 , dadurch gekennzeichnet, daß die4. Centrifuge according to claim 1, characterized in that the
Verstelleinrichtung aus einer konzentrisch zur Ringtasse (20) angeordneten Lochblende (23) besteht, die durch ihre Verdre- hung den freien Querschnitt der Durchtrittsöffnung/en (21 ) derAdjusting device consists of a perforated diaphragm (23) arranged concentrically to the ring cup (20), which, due to its rotation, provides the free cross section of the passage opening (s) (21)
Ringtasse (20) mehr oder weniger weit abdeckt.Ring cup (20) covers more or less far.
5. Zentrifuge nach Anspruch 1 , dadurch gekennzeichnet, daß die Verstelleinrichtung aus einer konzentrisch zur Ringtasse (20) angeordneten Lochblende (25) besteht, die durch ihre Axialverschiebung den freien Querschnitt der Durchtrittsöffnung/en (21 ) der Ringtasse (20) mehr oder weniger weit abdeckt.5. Centrifuge according to claim 1, characterized in that the adjusting device consists of a concentric to the ring cup (20) arranged aperture plate (25), the free cross section of the passage opening / s (21) of the ring cup (20) more or less by their axial displacement covers wide.
6. Zentrifuge nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß die Ringtasse (20) sowie die Lochblende (23, 25) der Verstelleinrichtung an der der Trommelstirnwand (14) mit den Flüssigkeits-Ablauföffnungen (13) benachbarten Zentrifugenge- häusewand (18) befestigt sind. 6. Centrifuge according to claims 1 to 5, characterized in that the ring cup (20) and the perforated diaphragm (23, 25) of the adjusting device on the drum end wall (14) with the liquid drain openings (13) adjacent centrifuge housing wall (18th ) are attached.
7. Zentrifuge nach Anspruch 6, dadurch gekennzeichnet, daß außerhalb der Zentrifugengehäusewand (18) ein Stellorgan (24, 26) angeordnet ist, das mit der innerhalb der Gehäusewand verstellbaren Lochblende (23, 25) in Wirkverbindung steht.7. Centrifuge according to claim 6, characterized in that outside the centrifuge housing wall (18) an actuator (24, 26) is arranged which is operatively connected to the adjustable inside the housing wall perforated diaphragm (23, 25).
8. Zentrifuge nach Anspruch 7, dadurch gekennzeichnet, daß das Stellorgan (24, 26) einen Stellmotor (30), einen Hydraulikzylinder, einen Pneumatikzylinder, eine Gewindebuchse etc. aufweist.8. Centrifuge according to claim 7, characterized in that the actuator (24, 26) has a servomotor (30), a hydraulic cylinder, a pneumatic cylinder, a threaded bush etc.
9. Zentrifuge nach Anspruch 8, dadurch gekennzeichnet, daß das Stellorgan zur automatischen Verstellung des Wehrs, d. h. zur Verstellung der wirksamen Breite des der Ringtasse (20) zugeordneten Auslaufschlitzes (19 bzw. 21 ) mit Meßwertgebern verbunden ist zur Messung von Menge und/oder TS-Gehalt und/oder Zähigkeit des eingedickten Feststoffaustrages und/oder von Menge/Konzentration des Schlammzulaufes und/oder von Trübung des Zentratablaufes. 9. Centrifuge according to claim 8, characterized in that the actuator for automatic adjustment of the weir, ie for adjusting the effective width of the ring cup (20) associated outlet slot (19 or 21) is connected to sensors for measuring the amount and / or TS content and / or viscosity of the thickened solids discharge and / or of the amount / concentration of the sludge feed and / or of turbidity of the centrate drain.
1/31.3
2/3 2.3
3/3 3.3
EP01936331A 2000-05-05 2001-05-07 Solid bowl centrifuge for separating mixtures of liquids and solids Expired - Lifetime EP1280606B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10021983A DE10021983A1 (en) 2000-05-05 2000-05-05 Solid bowl centrifuge has an adjustable weir consisting of an annular plate connected to the centrifuge housing and fixed to cover the liquid openings of the centrifuge drum from the outside
DE10021983 2000-05-05
PCT/EP2001/005160 WO2001085349A1 (en) 2000-05-05 2001-05-07 Solid bowl centrifuge for separating mixtures of liquids and solids

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EP1280606A1 true EP1280606A1 (en) 2003-02-05
EP1280606B1 EP1280606B1 (en) 2003-09-24

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EP (1) EP1280606B1 (en)
AT (1) ATE250462T1 (en)
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DE (2) DE10021983A1 (en)
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AU6226601A (en) 2001-11-20
ATE250462T1 (en) 2003-10-15
DE50100690D1 (en) 2003-10-30
DE10021983A1 (en) 2001-11-08
WO2001085349A1 (en) 2001-11-15
EP1280606B1 (en) 2003-09-24
DK1280606T3 (en) 2004-01-12
US20040058796A1 (en) 2004-03-25

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