EP1122358B2 - Sorter for cleaning a fibre suspension - Google Patents

Sorter for cleaning a fibre suspension Download PDF

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Publication number
EP1122358B2
EP1122358B2 EP01101559A EP01101559A EP1122358B2 EP 1122358 B2 EP1122358 B2 EP 1122358B2 EP 01101559 A EP01101559 A EP 01101559A EP 01101559 A EP01101559 A EP 01101559A EP 1122358 B2 EP1122358 B2 EP 1122358B2
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EP
European Patent Office
Prior art keywords
rotor
screen
sorter
basket
accept
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EP01101559A
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German (de)
French (fr)
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EP1122358B1 (en
EP1122358A2 (en
EP1122358A3 (en
Inventor
Helmuth Dipl.Ing.Dr. Gabl
Axel Dipl.Ing. Pichler
Alexander Dipl.Ing. Gscheider
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Andritz AG
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Andritz AG
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Priority to AT01101559T priority Critical patent/ATE299965T1/en
Publication of EP1122358A2 publication Critical patent/EP1122358A2/en
Publication of EP1122358A3 publication Critical patent/EP1122358A3/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a sorter for cleaning a pulp suspension, wherein in the inlet area an additional screen basket is provided for presorting.
  • Sorters are machines used in the paper industry for cleaning a stock suspension consisting of water, fibers and dirt particles.
  • a feed stream is passed through a sieve device, wherein the accept flow, consisting of water and fibers, flows through the sieve.
  • a partial stream, called the reject stream, consisting of water, fibers and contaminants, is generally withdrawn at the end opposite the feed stream.
  • the reject stream consisting of water, fibers and contaminants.
  • the sorter there is a separation of solid particles present in liquid.
  • the liquid is separated from the solid.
  • such a sorter is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually provided with holes or vertical slots and a rotating rotor.
  • the task of the rotor is to keep the sieve slots free, which is achieved by wings that rotate just short of the sieve surface.
  • the accept stream is collected in a so-called accept space, which is often conical, and drawn off radially at one point.
  • the reject flow is generally conducted at the opposite side of the feed basket of the screen basket in a generally annular Rejektraum and subtracted tangentially from this.
  • Such a sorter is eg from the US 4,268,381 known.
  • the disadvantage of these sorting machines is that the risk of clogging at low flow velocities occurs due to a relatively large rejection space.
  • the aim of the invention is therefore to provide an improvement in the flow conditions in the sorter, in order to achieve a reduction of the energy used with increased production and dirt separation.
  • the invention is therefore characterized in that arranged in the presorting in the inlet stream, rotating vanes are provided and the additional screen basket has the same diameter as the screen basket of the further sorting stage. This can avoid false currents and a flow of coarse particles directly into the fine particle area. Furthermore, the rotating abrasive blades of the rotor prevent the highly abrasive heavy parts from striking the surface of the screen and damaging them
  • An advantageous development of the invention is characterized in that the additional screen basket rotates with the rotor, wherein the additional screen basket can also be designed to be stationary.
  • An advantageous embodiment of the invention is characterized in that the accept space is configured double conical.
  • An advantageous development of the invention is characterized in that the sorter is designed as a double machine.
  • a favorable development of the invention is characterized in that the feed takes place axially through the rotor.
  • a favorable embodiment of the invention is characterized in that the drive-side rotor part in its height is equal to or greater than the on and flowed through, the drive side facing away from the rotor part.
  • a favorable embodiment of the invention is characterized in that the feed takes place centrally from the side.
  • An advantageous embodiment of the invention is characterized in that the sorter is arranged horizontally.
  • a favorable development of the invention is characterized in that several blades are provided distributed over the height and / or circumference of the rotor.
  • FIG. 1 an embodiment of the invention with an area for an integrated pre-sorting
  • Fig. 2 shows a further embodiment of the invention
  • Fig. 3 shows an alternative embodiment of the invention
  • 4 shows an embodiment of a twin machine
  • FIG. 5 shows a diagram of the dependence of the specific energy on the screen flow
  • FIG. 6 shows a diagram of the dirt point reduction for screen flow.
  • Fig. 1 now shows the upper part of a sorter 1, which is arranged vertically, with an integrated presorting.
  • the sorter 1 is fed via the inlet nozzle 2, the pulp suspension.
  • a presorting region 10 is provided in the upper region of the sorter 1, into which the suspension passes through a sieve 11.
  • the flow of pulp suspension in the pre-sorting is thus carried out from outside to inside.
  • a rotor 12 runs, which is connected to the rotor 4 via an extension 13.
  • the rotor can also run inside the screen.
  • the heavy parts leave the Vorsortier Complex through a nozzle 14.
  • the rotor 12 can in Vorsortier Scheme 10 both in the feed stream (as shown) or in the accept stream, which is then fed to a further fine sorting in the lower part of the sorter 1 run. Runs the rotor 12 in the feed stream, so the strongly abrasive acting heavy parts are held on the surface of the screen 11 by the rotating cleaning blades of the rotor 12 and damage them.
  • Fig. 2 shows a sorter 1, which is fed through a feed nozzle 2, a pulp suspension for cleaning.
  • an installation 3 is provided, which is shown here as a truncated cone.
  • the "tip" of the truncated cone points here in the direction of the rotor 4.
  • For optimal deflection of the flank angle ⁇ of the truncated cone is between 10 ° and 60 °.
  • the pulp suspension enters the space between the rotor 4 and the sieve 5 and is conveyed through the sieve into the acceptance space 6.
  • the housing of the accepting space is of biconical design, that is, the housing tapers approximately from the upper edge of the accepting outlet 7 conically towards the reject space, the angle of the accepting space being designed for a constant flow rate assuming uniform outflow through the sieve.
  • the rotor 4 of the sorter 1 is designed for a uniform Siebanströmung, which causes a low thickening behavior on the screen height. It has the shape of a parabola, so that the axial flow rate within the screen basket remains constant assuming uniform outflow through the screen. Alternatively, the shape of the rotor can also be approximated by a cone shape.
  • the reject space is configured such that flow velocities greater than 2.5 m / sec are present with or without additional introduction of stirring energy through the rotor. As a result, a blockage is virtually avoided.
  • Fig. 3 shows an analog arrangement of a sorter 1, wherein here the inlet nozzle 2 is arranged so that the suspension is fed parallel to the wall of the truncated cone 3.
  • Fig. 4 shows the execution of a top machine, as it is designed for high production rates.
  • the rotor becomes e.g. designed as a double parabolic rotor 4, 4 'or double bevel rotor.
  • the Rejektabzug 8, 8 'and the strainer 5, 5' is provided in duplicate.
  • the accept space 6, 6 ' is biconical, i. in turn, that the housing approximately tapers conically from the upper edge of the accept outlet to the reject space.
  • the stock suspension is in turn supplied via the supply pipe 2 and guided axially through the rotor in the illustrated embodiment.
  • the drive-side rotor part 4 in the height L1 is equal to or greater than the on and flowed through, the drive side remote rotor part 4 'with the height L2.
  • the suspension emerges in the central region through openings 9 from the rotor part 4 'through which it flows and is distributed here in both directions.
  • it passes through the strainer basket 5, 5 'into the accepting space 6, 6', which is likewise designed to be double-conical.
  • the reject flows both upwards and downwards and is discharged here from the machine in a reject space 8, 8 '.
  • the feed can also be made centrally from one side.
  • the accept outlet may be either double, i. above (7 ') or below (7) or simply be mounted centrally.
  • the sorting machine can also be performed in a lying form.
  • Fig. 5 shows the diagram of the energy demand on the Sieb thoroughlyströmung, in which case a curve for previous sorter and a curve for the sorter according to the invention is shown with a conical installation in the inlet space.

Abstract

A pulp suspension cleaning screen comprises a basket (11) in the infeed area for pre-screening.

Description

Die Erfindung betrifft einen Sortierer zur Reinigung einer Faserstoffsuspensionwobei im Zulaufbereich ein zusätzlicher Siebkorb zur Vorsortierung vorgesehen ist.The invention relates to a sorter for cleaning a pulp suspension, wherein in the inlet area an additional screen basket is provided for presorting.

Sortierer sind in der Papierindustrie eingesetzte Maschinen zur Reinigung einer Stoffsuspension, die aus Wasser, Faserstoffen und Schmutzpartikeln besteht. Dabei wird ein Zulaufstrom über eine Siebvorrichtung geführt, wobei der Akzeptstrom, bestehend aus Wasser und Fasern, durch das Sieb hindurchströmt. Ein Teilstrom, genannt Rejektstrom, bestehend aus Wasser, Fasern und Schmutzstoffen, wird im allgemeinen an dem dem Zulaufstrom gegenüberliegenden Ende abgezogen. Somit erfolgt bei den Sortierern eine Auftrennung von in Flüssigkeit vorliegenden festen Partikeln. Im Gegensatz dazu wird bei der Filtration die Flüssigkeit vom Feststoff abgetrennt. Im allgemeinen ist ein derartiger Sortierer rotationssymmetrisch ausgeführt und besteht aus einem Gehäuse mit einem tangential angeordneten Zulauf, einem zylindrischen Siebkorb, meist mit Löchern oder senkrechten Schlitzen versehen und einem sich drehenden Rotor. Die Aufgabe des Rotors besteht in der Freihaltung der Siebschlitze, was durch knapp an der Sieboberfläche rotierende Flügel erreicht wird. Der Akzeptstrom wird in einem sogenannten Akzeptraum, der oft konisch ausgeführt ist, gesammelt und an einer Stelle radial abgezogen. Der Rejekt-Strom wird im allgemeinen an der dem Zulauf gegenüberliegenden Seite des Siebkorbes in einem meist ringförmigen Rejektraum geführt und aus diesem tangential abgezogen. Ein derartiger Sortierer ist z.B. aus der US 4,268,381 bekannt. Der Nachteil dieser Sortiermaschinen besteht darin, dass durch einen relativ groß ausgeführten Rejektraum die Gefahr des Verstopfens bei geringen Strömungsgeschwindigkeiten auftritt. Weiters tritt eine ungleichmäßige Anströmung des Siebkorbes sowie ungleichmäßige Strömungsbedingungen im Akzeptraum, speziell im Bereich des Gutstoffaustritts. Weiters ist aus der EP-A-955 406 ein Sortierer mit einem Vorsortierbereich mit einem zusätzlichen Siebkorb bekannt.Sorters are machines used in the paper industry for cleaning a stock suspension consisting of water, fibers and dirt particles. In this case, a feed stream is passed through a sieve device, wherein the accept flow, consisting of water and fibers, flows through the sieve. A partial stream, called the reject stream, consisting of water, fibers and contaminants, is generally withdrawn at the end opposite the feed stream. Thus, in the sorters, there is a separation of solid particles present in liquid. In contrast, during filtration, the liquid is separated from the solid. In general, such a sorter is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually provided with holes or vertical slots and a rotating rotor. The task of the rotor is to keep the sieve slots free, which is achieved by wings that rotate just short of the sieve surface. The accept stream is collected in a so-called accept space, which is often conical, and drawn off radially at one point. The reject flow is generally conducted at the opposite side of the feed basket of the screen basket in a generally annular Rejektraum and subtracted tangentially from this. Such a sorter is eg from the US 4,268,381 known. The disadvantage of these sorting machines is that the risk of clogging at low flow velocities occurs due to a relatively large rejection space. Furthermore, there is an uneven flow of the screen basket and uneven flow conditions in the acceptance space, especially in the area of the accepts exit. Furthermore, is from the EP-A-955406 a sorter with a Vorsortierbereich with an additional screen basket known.

Ziel der Erfindung ist es daher, eine Verbesserung der Strömungsverhältnisse im Sortierer zu schaffen, um damit eine Verringerung der eingesetzten Energie bei gesteigerter Produktion und Schmutzabscheidung zu erreichen.The aim of the invention is therefore to provide an improvement in the flow conditions in the sorter, in order to achieve a reduction of the energy used with increased production and dirt separation.

Die Erfindung ist daher dadurch gekennzeichnet, dass im Vorsortierbereich im Zulaufstrom angeordnete, rotierende Flügel vorgesehen sind und der zusätzliche Siebkorb denselben Durchmesser aufweist, wie der Siebkorb der weiteren Sortierstufe. Dadurch können Fehlströme und ein Fluss grober Partikel direkt in den Feinpartikelbereich vermeiden werden. Weiters werden durch die rotierenden Reinigungsflügel des Rotors die stark abrasiv wirkenden Schwerteile abgehalten auf der Oberfläche des Siebes aufzuschlagen und diese zu beschädigenThe invention is therefore characterized in that arranged in the presorting in the inlet stream, rotating vanes are provided and the additional screen basket has the same diameter as the screen basket of the further sorting stage. This can avoid false currents and a flow of coarse particles directly into the fine particle area. Furthermore, the rotating abrasive blades of the rotor prevent the highly abrasive heavy parts from striking the surface of the screen and damaging them

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass der zusätzliche Siebkorb mit dem Rotor mitrotiert, wobei der zusätzliche Siebkorb auch feststehend ausgebildet sein kann.An advantageous development of the invention is characterized in that the additional screen basket rotates with the rotor, wherein the additional screen basket can also be designed to be stationary.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Akzeptraum doppelt konisch ausgestaltet ist.An advantageous embodiment of the invention is characterized in that the accept space is configured double conical.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass der Sortierer als Doppelmaschine ausgebildet ist.An advantageous development of the invention is characterized in that the sorter is designed as a double machine.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass der Zulauf achsial durch den Rotor erfolgt.A favorable development of the invention is characterized in that the feed takes place axially through the rotor.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der antriebsseitige Rotorteil in seiner Höhe gleich oder größer als der an- und durchgeströmte, der Antriebsseite abgewandte Rotorteil ist.A favorable embodiment of the invention is characterized in that the drive-side rotor part in its height is equal to or greater than the on and flowed through, the drive side facing away from the rotor part.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Zulauf mittig von der Seite erfolgt.A favorable embodiment of the invention is characterized in that the feed takes place centrally from the side.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass der Akzeptauslass zweifach vorgesehen ist.An advantageous development of the invention is characterized in that the accept outlet is provided in duplicate.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Sortierer liegend angeordnet ist.An advantageous embodiment of the invention is characterized in that the sorter is arranged horizontally.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass am Rotor mehrere Flügel über Höhe und/oder Umfang verteilt vorgesehen sind.A favorable development of the invention is characterized in that several blades are provided distributed over the height and / or circumference of the rotor.

Die Erfindung wird nun im folgenden an Hand der Zeichnungen beispielhaft beschrieben, wo bei Fig. 1 eine Ausgestaltung der Erfindung mit einem Bereich für eine integrierte Vorsortierung, Fig. 2 eine weitere Ausgestaltung der Erfindung, Fig. 3 eine alternative Ausgestaltung der Erfindung, Fig. 4 eine Ausführung einer Doppelmaschine, Fig. 5 ein Diagramm der Abhängigkeit der spezifischen Energie zur Siebdurchströmung und Fig. 6 ein Diagramm der Schmutzpunktreduktion zur Siebdurchströmung darstellt.The invention will now be described by way of example with reference to the drawings, where in Fig. 1 an embodiment of the invention with an area for an integrated pre-sorting, Fig. 2 shows a further embodiment of the invention, Fig. 3 shows an alternative embodiment of the invention, 4 shows an embodiment of a twin machine, FIG. 5 shows a diagram of the dependence of the specific energy on the screen flow, and FIG. 6 shows a diagram of the dirt point reduction for screen flow.

Fig. 1 zeigt nun den oberen Teil eines Sortierers 1, der vertikal angeordnet ist, mit einer integrierten Vorsortierung. Hierbei wird dem Sortierer 1 über den Zulaufstutzen 2 die Faserstoffsuspension zugeführt. Um im Bereich der Vorsortierung eine Schwerteilabscheidung durchzuführen, ist im oberen Bereich des Sortierers 1 ein Vorsortierbereich 10 vorgesehen, in den die Suspension durch ein Sieb 11 hindurchtritt. Die Strömung der Faserstoffsuspension bei der Vorsortierung erfolgt somit von außen nach innen. Damit können spezifisch schwere Teile und großflächige Verunreinigungen, die aus verschmutzten bzw. hoch verschmutzten Faserstoffen resultieren, gut entfernt werden. Außerhalb des Siebes 11, d.h. auf der Zulaufseite, läuft ein Rotor 12 mit, der mit dem Rotor 4 über einen Fortsatz 13 verbunden ist. Bei einer alternativen Ausführung kann der Rotor auch innerhalb des Siebes laufen. Die Schwerteile verlassen den Vorsortierbereich durch einen Stutzen 14. Der Rotor 12 kann im Vorsortierbereich 10 sowohl im Zulaufstrom (wie dargestellt) oder auch im Akzeptstrom, der dann einer weiteren Feinsortierung im unteren Bereich des Sortierers 1 zugeführt wird, laufen. Läuft der Rotor 12 im Zulaufstrom, so werden durch die rotierenden Reinigungsflügel des Rotors 12 die stark abrasiv wirkenden Schwerteile abgehalten auf der Oberfläche des Siebes 11 aufzuschlagen und diese zu beschädigen.Fig. 1 now shows the upper part of a sorter 1, which is arranged vertically, with an integrated presorting. Here, the sorter 1 is fed via the inlet nozzle 2, the pulp suspension. In order to carry out heavy particle separation in the area of presorting, a presorting region 10 is provided in the upper region of the sorter 1, into which the suspension passes through a sieve 11. The flow of pulp suspension in the pre-sorting is thus carried out from outside to inside. Thus, specific heavy parts and large-scale impurities resulting from contaminated or highly contaminated fibers can be removed well. Outside the screen 11, ie on the inlet side, a rotor 12 runs, which is connected to the rotor 4 via an extension 13. In an alternative embodiment The rotor can also run inside the screen. The heavy parts leave the Vorsortierbereich through a nozzle 14. The rotor 12 can in Vorsortierbereich 10 both in the feed stream (as shown) or in the accept stream, which is then fed to a further fine sorting in the lower part of the sorter 1 run. Runs the rotor 12 in the feed stream, so the strongly abrasive acting heavy parts are held on the surface of the screen 11 by the rotating cleaning blades of the rotor 12 and damage them.

Hiebei werden die spezifisch schweren Teile nach außen zentrifugiert. Damit wird einerseits eine längere Standzeit der Siebkörbe im Vorsortierbereich erzielt, anderseits wird durch die gezielte Barriere mittels Vorsortierkorb eine nachhaltige Abhaltung von Schwerteilen im zentrifugalen Nachsortierbereich erreicht. Dies bewirkt, daß die Rotoren, da sie im Gutstoff der ersten Stufe rotieren, länger an den Anlaufkanten belastet werden, eine geringere Abrasion und Energieaufnahme aufweisen und damit näher zur Sieboberfläche des Siebes 5 angestellt werden können, ohne daß Beschädigungen des Rotors oder der Sieboberfläche ausgelöst werden. Die getrennte Abführung von groben und kleineren Verunreinigungen führt zur Leistungssteigerungen (Durchsatz und Effektivitätssteigerung) gegenüber herkömmlichen Sortiermaschinen. Für hohe Produktionsleistungen kann auch diese Variante mit einem Doppelkegelrotor ausgeführt werden. Die dargestellte Ausführung ermöglicht weiters eine bessere, einfachere Abdichtung sowie eine bessere zugänglichkeit zur Reinigung.Hiebei the specific heavy parts are centrifuged outwards. On the one hand, a longer service life of the screen baskets in the pre-sorting area is achieved, on the other hand a sustainable holding of heavy parts in the centrifugal re-sorting area is achieved by the targeted barrier by means of presort basket. This causes the rotors, since they rotate in the accepts of the first stage are charged longer at the start edges, have a lower abrasion and energy absorption and thus can be made closer to the screen surface of the screen 5, without causing damage to the rotor or Sieboberfläche become. The separate removal of coarse and smaller impurities leads to increased performance (throughput and increased efficiency) compared to conventional sorting machines. For high production rates, this variant can also be designed with a double bevel rotor. The illustrated embodiment further allows a better, easier seal and better accessibility for cleaning.

Fig. 2 zeigt einen Sortierer 1, dem durch einen Zulaufstutzen 2 eine Faserstoffsuspension zur Reinigung zugeführt wird. Im Bereich des Zulaufes ist ein Einbau 3 vorgesehen, der hier als Kegelstumpf dargestellt ist. Die "Spitze" des Kegelstumpfes weist hier in Richtung des Rotors 4. Zur optimalen Umlenkung beträgt der Flankenwinkel α des Kegelstumpfes zwischen 10° und 60°. Die Faserstoffsuspension tritt in den Raum zwischen Rotor 4 und Sieb 5 ein und wird durch das Sieb hindurch in den Akzeptraum 6 gefördert. Das Gehäuse des Akzeptraumes ist doppelkonisch ausgeführt, d.h., das Gehäuse verjüngt sich etwa ab der Oberkante des Akzeptauslasses 7 konisch zum Rejektraum hin , wobei der Winkel des Akzeptraumes für eine gleichbleibende Strömungsgeschwindigkeit bei angenommener gleichförmiger Ausströmung durch das Sieb ausgelegt ist.Fig. 2 shows a sorter 1, which is fed through a feed nozzle 2, a pulp suspension for cleaning. In the area of the inlet, an installation 3 is provided, which is shown here as a truncated cone. The "tip" of the truncated cone points here in the direction of the rotor 4. For optimal deflection of the flank angle α of the truncated cone is between 10 ° and 60 °. The pulp suspension enters the space between the rotor 4 and the sieve 5 and is conveyed through the sieve into the acceptance space 6. The housing of the accepting space is of biconical design, that is, the housing tapers approximately from the upper edge of the accepting outlet 7 conically towards the reject space, the angle of the accepting space being designed for a constant flow rate assuming uniform outflow through the sieve.

Der Rotor 4 des Sortierers 1 ist dabei für eine gleichmäßige Siebanströmung, die ein geringes Eindickverhalten über der Siebhöhe bedingt, ausgelegt. Er weist die Form einer Parabel auf, so daß die axiale Strömungsgeschwindigkeit innerhalb des Siebkorbes bei angenommener gleichförmiger Ausströmung durch das Sieb konstant bleibt. Alternativ kann die Form des Rotors auch über eine Konusform angenähert werden.The rotor 4 of the sorter 1 is designed for a uniform Siebanströmung, which causes a low thickening behavior on the screen height. It has the shape of a parabola, so that the axial flow rate within the screen basket remains constant assuming uniform outflow through the screen. Alternatively, the shape of the rotor can also be approximated by a cone shape.

Um das Rejekt entsprechend abführen zu können, wird der Rejektraum derart ausgestaltet, daß Strömungsgeschwindigkeiten größer 2,5 m / sek mit oder ohne zusätzlicher Einbringung von Rührenergie durch den Rotor vorliegen. Dadurch wird eine Verstopfung praktisch vermieden.In order to be able to discharge the reject correspondingly, the reject space is configured such that flow velocities greater than 2.5 m / sec are present with or without additional introduction of stirring energy through the rotor. As a result, a blockage is virtually avoided.

Fig. 3 zeigt eine analoge Anordnung eines Sortierers 1, wobei hier der Zulaufstutzen 2 so angeordnet ist, daß die Suspension parallel zur Wand des Kegelstumpfes 3 zugeführt wird. Dadurch kann der Energieverlust, der sonst bei Strömungsumlenkung vorhanden ist, vermieden werden.Fig. 3 shows an analog arrangement of a sorter 1, wherein here the inlet nozzle 2 is arranged so that the suspension is fed parallel to the wall of the truncated cone 3. As a result, the energy loss that is otherwise present in flow deflection can be avoided.

Fig. 4 zeigt die Ausführung einer Topmaschine, wie sie für hohe Produktionsleistungen ausgeführt wird. Dabei wird der Rotor z.B. als Doppelparabel-Rotor 4, 4' oder Doppelkegelrotor ausgeführt. Auch der Rejektabzug 8, 8' und der Siebkorb 5, 5' ist in zweifacher Ausfertigung vorgesehen. Auch hier ist der Akzeptraum 6, 6' doppelkonisch ausgeführt, d.h. wiederum, daß sich das Gehäuse ca. von der Oberkante des Akzeptauslasses zum Rejektraum hin konisch verjüngt. Die Stoffsuspension wird hier wiederum über den Zufuhrstutzen 2 zugeführt und in der dargestellten Ausführungsform axial durch den Rotor geführt. Bei dieser Art der Anströmung ist der antriebsseitige Rotorteil 4 in der Höhe L1 gleich oder größer als der an- und durchgeströmte, der Antriebsseite abgewandte Rotorteil 4' mit der Höhe L2. Die Suspension tritt im mittleren Bereich durch Öffnungen 9 aus dem durchströmten Rotorteil 4' aus und wird hier in beide Richtungen verteilt. Sie tritt wie bei einem einfachen Sortierer durch den Siebkorb 5, 5' hindurch in den Akzeptraum 6, 6', der hier ebenfalls doppelkonisch ausgeführt ist. Das Rejekt strömt sowohl nach oben als auch nach unten und wird hier in einem Rejektraum 8, 8' aus der Maschine abgeführt. Bei einer anderen Ausführungsform kann der Zulauf auch mittig von einer Seite her erfolgen. Der Akzeptauslaß kann entweder zweifach, d.h. oben (7') bzw. unten (7) oder auch einfach mittig angebracht sein. Die Sortiermaschine kann dabei auch in liegender Form ausgeführt werden.Fig. 4 shows the execution of a top machine, as it is designed for high production rates. At this time, the rotor becomes e.g. designed as a double parabolic rotor 4, 4 'or double bevel rotor. Also, the Rejektabzug 8, 8 'and the strainer 5, 5' is provided in duplicate. Again, the accept space 6, 6 'is biconical, i. in turn, that the housing approximately tapers conically from the upper edge of the accept outlet to the reject space. The stock suspension is in turn supplied via the supply pipe 2 and guided axially through the rotor in the illustrated embodiment. In this type of flow, the drive-side rotor part 4 in the height L1 is equal to or greater than the on and flowed through, the drive side remote rotor part 4 'with the height L2. The suspension emerges in the central region through openings 9 from the rotor part 4 'through which it flows and is distributed here in both directions. As with a simple sorter, it passes through the strainer basket 5, 5 'into the accepting space 6, 6', which is likewise designed to be double-conical. The reject flows both upwards and downwards and is discharged here from the machine in a reject space 8, 8 '. In another embodiment, the feed can also be made centrally from one side. The accept outlet may be either double, i. above (7 ') or below (7) or simply be mounted centrally. The sorting machine can also be performed in a lying form.

Fig. 5 zeigt das Diagramm des Energiebedarfs über die Siebdurchströmung, wobei hier eine Kurve für bisherige Sortierer und eine Kurve für den Sortierer gemäß der Erfindung mit einem kegeligen Einbau im Zulaufraum dargestellt ist.Fig. 5 shows the diagram of the energy demand on the Siebdurchströmung, in which case a curve for previous sorter and a curve for the sorter according to the invention is shown with a conical installation in the inlet space.

In Fig. 6 ist die Schmutzpunktreduktion über der Siebdurchströmung dargestellt. Hier ist erkennbar, daß durch einen kegeligen Einbau im Zulaufraum auch die Schmutzpunktreduktion wesentlich erhöht werden konnte, bei gleichzeitiger Senkung des spezifischen Energiebedarfs.In Fig. 6, the Schmutzpunktreduktion is shown on the Siebdurchströmung. Here it can be seen that by a conical installation in Zulaufraum the Schmutzpunktreduktion could be significantly increased, while reducing the specific energy consumption.

Claims (8)

  1. Screen for cleaning a pulp suspension, with a rotor (4, 4'), an inlet branch (2), an accept chamber (6,6'), and a reject discharge (8, 8'), where an additional screen basket (11) is provided in the infeed area for prescreening, with a rotor (12) with rotating blades that is connected to rotor (4, 4') being provided in the prescreening area (10) in the infeed flow and the additional screen basket (11) having the same diameter as the screen basket (5) of the further screening stage, characterized by the additional screening basket (11) turning together with the rotor (12) that is provided with blades.
  2. Device according to Claim 1, characterized by the accept chamber (6) being designed double-conically.
  3. Device according to one of Claims 1 or 2, characterized by the screen (1) being designed as double machine.
  4. Device according to Claim 3, characterized by the infeed taking place axially through the rotor (4).
  5. Device according to Claim 4, characterized by the drive-side rotor part (4) being of the same height as or higher than the rotor part (4') facing away from the drive and into which and through which the pulp flows.
  6. Device according to one of the Claims 3 to 5, characterized by two accept discharges (7, 7') being provided.
  7. Device according to one of the Claims 1 to 6, characterized by the screen (1) being arranged horizontally.
  8. Device according to one of the Claims 1 to 7, characterized by the rotor (4, 4') having several blades arranged at different heights and/or distributed over the circumference.
EP01101559A 2000-02-03 2001-01-25 Sorter for cleaning a fibre suspension Expired - Lifetime EP1122358B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT01101559T ATE299965T1 (en) 2000-02-03 2001-01-25 SCREENER FOR CLEANING A FIBER SUSPENSION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT166002000 2000-02-03
AT0016600A AT408771B (en) 2000-02-03 2000-02-03 SORTER FOR CLEANING A FIBER SUSPENSION

Publications (4)

Publication Number Publication Date
EP1122358A2 EP1122358A2 (en) 2001-08-08
EP1122358A3 EP1122358A3 (en) 2001-11-21
EP1122358B1 EP1122358B1 (en) 2005-07-20
EP1122358B2 true EP1122358B2 (en) 2008-01-02

Family

ID=3653490

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101559A Expired - Lifetime EP1122358B2 (en) 2000-02-03 2001-01-25 Sorter for cleaning a fibre suspension

Country Status (8)

Country Link
EP (1) EP1122358B2 (en)
CN (1) CN1180160C (en)
AT (2) AT408771B (en)
BR (1) BR0100352A (en)
CA (1) CA2332679A1 (en)
DE (1) DE50106745D1 (en)
ES (1) ES2246260T5 (en)
MX (1) MXPA01001293A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10115298A1 (en) * 2001-03-28 2002-10-17 Voith Paper Patent Gmbh Pressure sorter for removing contaminants from a paper fiber suspension containing contaminants
AT413390B (en) 2003-03-27 2006-02-15 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
AT413110B (en) * 2003-10-15 2005-11-15 Andritz Ag Maschf SORTER
CN110787517B (en) * 2019-11-28 2020-10-30 广东吉康环境系统科技有限公司 Sludge drying pretreatment device
CN113648693B (en) * 2021-07-14 2022-12-27 安徽金星钛白（集团）有限公司 Primary filter for preventing blockage during blanking of metatitanic acid storage tank

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053391A (en) * 1959-08-17 1962-09-11 Bird Machine Co Apparatus for screening
US4302327A (en) * 1980-03-17 1981-11-24 The Black Clawson Company Center flow screening apparatus
DE3703831A1 (en) * 1987-02-07 1988-09-08 Voith Gmbh J M PLASTIC SORTER
SE464640B (en) * 1988-06-16 1991-05-27 Kamyr Ab DEVICE FOR SILENCE OF A SUSPENSION OF A FIBER CELLULOSAMASSA
FI902968A (en) * 1990-06-13 1991-12-14 Sunds Defibrator Jylha Oy SIKTENHET FOER SORTERING AV MASSOR, SAERSKILT PAPPERSMASSA.
DE4135854A1 (en) * 1991-10-31 1993-05-06 J.M. Voith Gmbh, 7920 Heidenheim, De SORTER
FI93979C (en) * 1993-08-20 1995-06-26 Tampella Oy Valmet Method and pressure sorter for sorting pulp
US5575395A (en) * 1994-07-15 1996-11-19 A. Ahlstrom Corporation Method and apparatus for screening fibrous suspensions
US5884774A (en) * 1996-03-11 1999-03-23 Aikawa Iron Works Co., Ltd. Papermaking screen
SE507481C2 (en) * 1996-05-02 1998-06-15 Alfa Laval Ab Device for separating impurities from fiber pulp suspensions
SE511786C2 (en) * 1998-03-06 1999-11-22 Sunds Defibrator Ind Ab Screening device with two screening chambers for separating fiber suspensions

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Publication number Publication date
BR0100352A (en) 2001-10-02
ATA1662000A (en) 2001-07-15
CA2332679A1 (en) 2001-08-03
CN1320741A (en) 2001-11-07
EP1122358B1 (en) 2005-07-20
EP1122358A2 (en) 2001-08-08
ATE299965T1 (en) 2005-08-15
CN1180160C (en) 2004-12-15
DE50106745D1 (en) 2005-08-25
EP1122358A3 (en) 2001-11-21
AT408771B (en) 2002-03-25
ES2246260T5 (en) 2008-05-01
MXPA01001293A (en) 2005-08-16
ES2246260T3 (en) 2006-02-16

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