EP1122358B1 - Sorter for cleaning a fibre suspension - Google Patents

Sorter for cleaning a fibre suspension Download PDF

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Publication number
EP1122358B1
EP1122358B1 EP01101559A EP01101559A EP1122358B1 EP 1122358 B1 EP1122358 B1 EP 1122358B1 EP 01101559 A EP01101559 A EP 01101559A EP 01101559 A EP01101559 A EP 01101559A EP 1122358 B1 EP1122358 B1 EP 1122358B1
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EP
European Patent Office
Prior art keywords
rotor
sorter
screen basket
screen
infeed
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EP01101559A
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German (de)
French (fr)
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EP1122358A3 (en
EP1122358B2 (en
EP1122358A2 (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 and in the inlet area an additional screen basket is provided for presorting.
  • Graders are machines used in the paper industry for cleaning a pulp suspension consisting of water, fiber and Dirt particles exists.
  • a feed stream over a Led sieve device wherein the accept current, consisting of water and fibers through which the sieve passes.
  • a partial flow, called Reject current, consisting of water, fibers and contaminants, is in the general at the opposite end of the feed stream deducted.
  • Reject current consisting of water, fibers and contaminants.
  • a separation of in Liquid present solid particles.
  • the liquid separated from the solid is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical sieve basket, usually with holes or vertical slots provided and a rotating rotor.
  • the task of the rotor consists in keeping the sieve slots free, which is close to the Siebober constitutional rotating wings is achieved.
  • the accept current is in a so-called acceptance space, which is often conical, collected and withdrawn radially at one point.
  • the reject current becomes generally at the opposite side of the inlet of the Screen basket in a mostly annular Rejektraum out and out deducted tangentially.
  • Such a sorter is e.g. from the US 4,268,381 known.
  • the disadvantage of these sorting machines is that by a relatively large Rejektraum the risk of Clogging occurs at low flow rates. Furthermore, occurs an uneven flow of the screen basket as well uneven flow conditions in the acceptance space, especially in the Range of the accepts exit.
  • EP-A-955 406 a Grader with a pre-sorting area with an additional screen basket known.
  • the aim of the invention is therefore to improve the To create flow conditions in the sorter, so that one Reduction of the energy used with increased production and To achieve dirt separation.
  • the invention is therefore characterized in that in Vorsortier Scheme arranged 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 cause false currents and a Avoid coarse particle flow directly into the fine particle area. Furthermore, by the rotating cleaning blades of the rotor severely abrasive particles are held on the surface of the machine Open sieves and damage them
  • An advantageous development of the invention is characterized in that 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 that the acceptance space is configured double conical.
  • An advantageous development of the invention is characterized in that that the sorter is designed as a double machine.
  • a favorable development of the invention is characterized in that that the feed takes place axially through the rotor.
  • a favorable embodiment of the invention is characterized in that that the drive-side rotor part in height equal to or greater than that on and flowed through, the drive side facing away from rotor part.
  • a favorable embodiment of the invention is characterized in that that the inlet takes place in the middle of the side.
  • An advantageous development of the invention is characterized in that that the acceptance outlet is provided in duplicate.
  • An advantageous embodiment of the invention is characterized in that that the sorter is arranged horizontally.
  • a favorable development of the invention is characterized in that that the rotor distributes several wings over height and / or circumference are provided.
  • Fig. 1 shows an embodiment of the invention with an area for an integrated pre-sorting
  • Fig. 2 another Embodiment of the invention
  • Fig. 3 shows an alternative embodiment of 4
  • Fig. 5 a Diagram of the dependence of specific energy on Sieb malströmung
  • Fig. 6 is a diagram of Schmutzticianredulement represents the Sieb thoroughlyströmung.
  • Fig. 1 now shows the upper part of a sorter 1 arranged vertically is, with an integrated presorting.
  • the sorter 1 over fed to the inlet nozzle 2, the pulp suspension.
  • a Vorsortier Scheme 10 is provided in the suspension passes through a sieve 11.
  • the flow of Pulp suspension in the presorting thus takes place from the outside Inside. This allows specific heavy parts and large area Contaminants from polluted or highly polluted Fibers result, are well removed.
  • Outside the screen 11, i.e. on the inlet side runs a rotor 12, which with the rotor 4 over a projection 13 is connected. In an alternative embodiment can the rotor also run inside the screen.
  • Vorsortier Council Leave the heavy parts 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 Acceptance current, which then a further fine sorting in the lower range the sorter 1 is supplied, run. Does the rotor 12 in the feed stream, so by the rotating cleaning blades of the rotor 12, the strong Abrasive abrasive particles are held on the surface of the Turn sieves 11 open and damage them.
  • Fig. 2 shows a sorter 1, the through an inlet nozzle 2 a Pulp suspension is supplied for cleaning.
  • an installation 3 is provided, which is shown here as a truncated cone is.
  • the "tip" of the truncated cone points here in the direction of the rotor 4th
  • the flank angle ⁇ of the truncated cone between 10 ° and 60 °.
  • the pulp suspension enters the room between the rotor 4 and sieve 5 and is passed through the sieve in the Acceptance room 6 promoted.
  • the housing of the acceptance space is doppelkonisch executed, that is, the housing tapers approximately from the Upper edge of the accept outlet 7 conically towards the Rejektraum out, where the angle of acceptance space for a constant flow velocity assuming uniform outflow through the sieve is designed.
  • the rotor 4 of the sorter 1 is for a uniform Siebanströmung, which causes a low thickening behavior above the screen height, designed. It has the shape of a parabola, so that the axial Flow rate within the screen basket at assumed uniform outflow through the sieve remains constant. alternative The shape of the rotor can also be approximated by a cone shape.
  • Fig. 3 shows an analog arrangement of a sorter 1, wherein here the Inlet nozzle 2 is arranged so that the suspension is parallel to the wall the truncated cone 3 is supplied. As a result, the energy loss, which is otherwise present at flow deflection, be avoided.
  • Fig. 4 shows the execution of a top machine, as they are for high Production services is carried out.
  • the rotor becomes e.g. when Double parabolic rotor 4, 4 'or double bevel rotor executed.
  • the Rejektabzug 8, 8 'and the strainer 5, 5' is in duplicate intended.
  • the accept space 6, 6 ' is designed doppelkonisch, i.e. turn, that the housing approximately from the top of the Acceptance outlet tapers conically towards the rejection space.
  • the Substance suspension is in turn fed via the supply nozzle 2 here and guided axially through the rotor in the illustrated embodiment.
  • the drive-side rotor part 4 in the Height L1 equal to or greater than the on and flowed through, the drive side remote rotor part 4 'with the height L2.
  • the suspension occurs in middle region through openings 9 from the flow-through rotor part 4 ' and is distributed here in both directions.
  • She acts like one simple sorter through the strainer 5, 5 'through into the accept space 6, 6 ', which is also designed doppelkonisch here.
  • the reject flows both up and down and is here in one Reject space 8, 8 'discharged from the machine.
  • the inlet can also be done 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 do this also be executed in a lying form.
  • Fig. 5 shows the diagram of the energy demand over the Sieb thoroughlyströmung, here a curve for previous sorter and a Curve for the sorter according to the invention with a tapered installation is shown in the Zulaufraum.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Centrifugal Separators (AREA)

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 and 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.Graders are machines used in the paper industry for cleaning a pulp suspension consisting of water, fiber and Dirt particles exists. In this case, a feed stream over a Led sieve device, wherein the accept current, consisting of water and fibers through which the sieve passes. A partial flow, called Reject current, consisting of water, fibers and contaminants, is in the general at the opposite end of the feed stream deducted. Thus, in the sorters, a separation of in Liquid present solid particles. In contrast, at the Filtration the liquid separated from the solid. In general, a Such sorter is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical sieve basket, usually with holes or vertical slots provided and a rotating rotor. The task of the rotor consists in keeping the sieve slots free, which is close to the Sieboberfläche rotating wings is achieved. The accept current is in a so-called acceptance space, which is often conical, collected and withdrawn radially at one point. The reject current becomes generally at the opposite side of the inlet of the Screen basket in a mostly annular Rejektraum out and out deducted tangentially. Such a sorter is e.g. from the US 4,268,381 known. The disadvantage of these sorting machines is that by a relatively large Rejektraum the risk of Clogging occurs at low flow rates. Furthermore, occurs an uneven flow of the screen basket as well uneven flow conditions in the acceptance space, especially in the Range of the accepts exit. Furthermore, from EP-A-955 406 a Grader with a pre-sorting area 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 improve the To create flow conditions in the sorter, so that one Reduction of the energy used with increased production and To achieve 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 in Vorsortierbereich arranged 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 cause false currents and a Avoid coarse particle flow directly into the fine particle area. Furthermore, by the rotating cleaning blades of the rotor severely abrasive particles are held on the surface of the machine Open sieves and damage 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 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 that the acceptance 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 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 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 that the drive-side rotor part in height equal to or greater than that on and flowed through, the drive side facing away from 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 that the inlet takes place in the middle of 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 that the acceptance 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 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 that the rotor distributes several wings over height and / or circumference are provided.

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 below with reference to the drawings described by way of example where Fig. 1 shows an embodiment of the invention with an area for an integrated pre-sorting, Fig. 2 another Embodiment of the invention, Fig. 3 shows an alternative embodiment of 4, an embodiment of a twin machine, Fig. 5 a Diagram of the dependence of specific energy on Siebdurchströmung and Fig. 6 is a diagram of Schmutzpunktreduktion represents the Siebdurchströmung.

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 arranged vertically is, with an integrated presorting. Here is the sorter 1 over fed to the inlet nozzle 2, the pulp suspension. To be in the area the presorting to perform a heavy separation, is in top portion of the sorter 1 a Vorsortierbereich 10 is provided in the suspension passes through a sieve 11. The flow of Pulp suspension in the presorting thus takes place from the outside Inside. This allows specific heavy parts and large area Contaminants from polluted or highly polluted Fibers result, are well removed. Outside the screen 11, i.e. on the inlet side, runs a rotor 12, which with the rotor 4 over a projection 13 is connected. In an alternative embodiment can the rotor also run inside the screen. Leave the heavy parts the Vorsortierbereich through a nozzle 14. The rotor 12 can in Vorsortierbereich 10 both in the feed stream (as shown) or in the Acceptance current, which then a further fine sorting in the lower range the sorter 1 is supplied, run. Does the rotor 12 in the feed stream, so by the rotating cleaning blades of the rotor 12, the strong Abrasive abrasive particles are held on the surface of the Turn sieves 11 open 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. This is on the one hand a longer life of the baskets in Presorting achieved on the other hand, by the targeted barrier means Presort basket a sustained holding of heavy parts in the achieved centrifugal Nachsortierbereich. This causes the rotors, since they rotate in the accepts of the first stage, longer at the start edges be loaded, a lower abrasion and energy absorption have and thus employed closer to the screen surface of the screen 5 can be without damaging the rotor or the Sieboberfläche be triggered. The separate discharge of coarse and smaller impurities leads to increased performance (Throughput and increase in effectiveness) compared to conventional Sorting machines. For high production, this too Variant can be performed with a double bevel rotor. The illustrated Design also allows a better, easier seal as well 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, the through an inlet nozzle 2 a Pulp suspension is supplied for cleaning. In the area of Zulaufes an installation 3 is provided, which is shown here as a truncated cone is. The "tip" of the truncated cone points here in the direction of the rotor 4th For optimum deflection, the flank angle α of the truncated cone between 10 ° and 60 °. The pulp suspension enters the room between the rotor 4 and sieve 5 and is passed through the sieve in the Acceptance room 6 promoted. The housing of the acceptance space is doppelkonisch executed, that is, the housing tapers approximately from the Upper edge of the accept outlet 7 conically towards the Rejektraum out, where the angle of acceptance space for a constant flow velocity assuming uniform outflow through the sieve is designed.

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 for a uniform Siebanströmung, which causes a low thickening behavior above the screen height, designed. It has the shape of a parabola, so that the axial Flow rate within the screen basket at assumed uniform outflow through the sieve remains constant. alternative 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 discharge the reject accordingly, the Rejektraum designed such that flow rates greater than 2.5 m / sec with or without additional introduction of stirring energy by the rotor available. 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 parallel to the wall the truncated cone 3 is supplied. As a result, the energy loss, which is otherwise present at flow deflection, 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 they are for high Production services is carried out. At this time, the rotor becomes e.g. when Double parabolic rotor 4, 4 'or double bevel rotor executed. Also the Rejektabzug 8, 8 'and the strainer 5, 5' is in duplicate intended. Again, the accept space 6, 6 'is designed doppelkonisch, i.e. turn, that the housing approximately from the top of the Acceptance outlet tapers conically towards the rejection space. The Substance suspension is in turn fed via the supply nozzle 2 here 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 equal to or greater than the on and flowed through, the drive side remote rotor part 4 'with the height L2. The suspension occurs in middle region through openings 9 from the flow-through rotor part 4 ' and is distributed here in both directions. She acts like one simple sorter through the strainer 5, 5 'through into the accept space 6, 6 ', which is also designed doppelkonisch here. The reject flows both up and down and is here in one Reject space 8, 8 'discharged from the machine. With another Embodiment, the inlet can also be done 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 do this also be executed 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 over the Siebdurchströmung, here a curve for previous sorter and a Curve for the sorter according to the invention with a tapered installation is shown in the Zulaufraum.

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 on the Siebdurchströmung shown. Here it can be seen that by a conical installation in Zulaufraum also the Schmutzpunktreduktion be substantially increased could, while reducing the specific energy requirement.

Claims (11)

  1. Screen for cleaning a pulp suspension, where an additional screen basket (11) is provided in the infeed area for pre-screening, characterized by rotating blades (12) in the infeed flow being provided in the pre-screening area (10) and by the additional screen basket (11) having the same diameter as the screen basket (5) of the further screening stage.
  2. Device according to Claim 1, characterized by the additional screen basket (11) turning together with the rotor (12).
  3. Device according to Claim 1, characterized by the additional screen basket (11) being fixed.
  4. Device according to one of the Claims 1 to 3, characterized by the accept chamber (6) being designed double-conically.
  5. Device according to one of the Claims 1 to 4, characterized by the screen (1) being designed as double machine.
  6. Device according to Claim 5, characterized by the infeed taking place axially through the rotor (4).
  7. Device according to Claim 6, 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.
  8. Device according to Claim 7, characterized by the infeed taking place centrally from the side.
  9. Device according to one of the Claims 5 to 8, characterized by two accept discharges (7, 7') being provided.
  10. Device according to one of the Claims 1 to 9, characterized by the screen (1) being arranged horizontally.
  11. Device according to one of the Claims 1 to 10, 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
AT0016600A AT408771B (en) 2000-02-03 2000-02-03 SORTER FOR CLEANING A FIBER SUSPENSION
AT166002000 2000-02-03

Publications (4)

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

Family

ID=3653490

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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

Citations (2)

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Publication number Priority date Publication date Assignee Title
US4302327A (en) * 1980-03-17 1981-11-24 The Black Clawson Company Center flow screening apparatus
WO1995006159A1 (en) * 1993-08-20 1995-03-02 Valmet Corporation Method and pressure screen for screening fibre suspension

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US3053391A (en) * 1959-08-17 1962-09-11 Bird Machine Co Apparatus for screening
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
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4302327A (en) * 1980-03-17 1981-11-24 The Black Clawson Company Center flow screening apparatus
WO1995006159A1 (en) * 1993-08-20 1995-03-02 Valmet Corporation Method and pressure screen for screening fibre suspension

Also Published As

Publication number Publication date
DE50106745D1 (en) 2005-08-25
CN1320741A (en) 2001-11-07
BR0100352A (en) 2001-10-02
AT408771B (en) 2002-03-25
ATE299965T1 (en) 2005-08-15
EP1122358A3 (en) 2001-11-21
CA2332679A1 (en) 2001-08-03
ATA1662000A (en) 2001-07-15
EP1122358B2 (en) 2008-01-02
CN1180160C (en) 2004-12-15
MXPA01001293A (en) 2005-08-16
EP1122358A2 (en) 2001-08-08
ES2246260T5 (en) 2008-05-01
ES2246260T3 (en) 2006-02-16

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