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EP1124003B1 - Screen for purification of fibrous pulp - Google Patents

Screen for purification of fibrous pulp Download PDF

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Publication number
EP1124003B1
EP1124003B1 EP01101939A EP01101939A EP1124003B1 EP 1124003 B1 EP1124003 B1 EP 1124003B1 EP 01101939 A EP01101939 A EP 01101939A EP 01101939 A EP01101939 A EP 01101939A EP 1124003 B1 EP1124003 B1 EP 1124003B1
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EP
European Patent Office
Prior art keywords
rotor
screen
area
baffle
infeed
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.)
Expired - Lifetime
Application number
EP01101939A
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German (de)
French (fr)
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EP1124003A2 (en
EP1124003A3 (en
Inventor
Helmuth Dipl.-Ing. Dr. Gabl
Axel Dipl.-Ing. Pichler
Alexander Dipl.-Ing. Gscheider
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Andritz AG
Original Assignee
Andritz AG
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Publication date
Application filed by Andritz AG filed Critical Andritz AG
Priority to AT01101939T priority Critical patent/ATE295446T1/en
Publication of EP1124003A2 publication Critical patent/EP1124003A2/en
Publication of EP1124003A3 publication Critical patent/EP1124003A3/en
Application granted granted Critical
Publication of EP1124003B1 publication Critical patent/EP1124003B1/en
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Classifications

    • 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 Fibrous suspension.
  • 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.
  • such a sorter designed rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually with holes or vertical slots provided and a rotating rotor. The task of the rotor is to keep the Sieve slots, which by just at the Siebober constitutional rotating wings is reached.
  • the accept stream is in a so-called acceptance space, which is often conical, collected and radial in one place deducted.
  • the reject stream is generally at the inlet opposite side of the screen basket in a mostly annular Reject space out and subtracted tangentially from this.
  • Such a Sorter is e.g. from US 4,268,381.
  • the disadvantage of this Sorting machines is that by a relatively large Executed Rejektraum the risk of clogging at low Flow rates occurs. Furthermore, an uneven occurs Flow of the strainer basket and uneven Flow conditions in acceptance space, especially in the area of Acceptance, on.
  • Another sorter is known from WO 97/41296 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 the inlet area between pipe socket and the free end of the rotor a closed stationary installation is provided, the pulp suspension in the Space between parabolic rotor and cylindrical sieve deflects, wherein the stationary installation can be rotationally symmetrical. This will significantly improve the flow conditions and subsequently achieved a reduction in the energy used.
  • An advantageous development of the invention is characterized in that that the installation a cone, a truncated cone, hemisphere, spherical segment, Sphere layer, paraboloid or bivalve hyperboloid.
  • a favorable embodiment of the invention is characterized in that that when installed as a cone or truncated cone, the cone angle ⁇ between 10 ° and 60 °.
  • a favorable development of the invention is characterized in that that the axis of the inlet nozzle is arranged parallel to the conical surface is. This allows the flow to be better managed and the Energy losses are further reduced.
  • a favorable alternative embodiment of the invention is characterized characterized in that the installation is a spiral body, wherein the Slope of the spiral can be chosen such that the Flow velocity in the inlet area over the entire Bin width is constant.
  • a favorable development of the invention is characterized in that that distributed on the rotor several wings over height and / or circumference are provided.
  • Fig. 1 shows an embodiment of the invention
  • Fig. 2 an alternative embodiment of the invention
  • Fig. 3 shows an embodiment of a Double machine
  • Fig. 4 shows a further variant of the invention
  • Fig. 5 a 3-D representation of a variant of the invention
  • Fig. 6 shows the area for a integrated presorting
  • Fig. 7 is a diagram of the dependence of specific energy for Sieb dieströmung
  • Fig. 8 is a diagram of Dirt point reduction for Sieb prepareströmung represents.
  • Fig. 1 shows a sorter 1, 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 in the direction of the rotor 4.
  • the Installation 3 can be designed both as a hollow body, as well as a solid body be.
  • the flank angle is ⁇ of Truncated cone between 10 ° and 60 °.
  • the pulp suspension enters the Space between rotor 4 and sieve 5 and passes through the sieve promoted into the accept space 6.
  • the housing of the acceptance space is Double-conical executed, i. the case tapers off 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. He has the form of a parabola, so that the axial Flow rate within the screen basket at assumed uniform outflow through the sieve remains constant.
  • the shape of the rotor can also be approximated by a cone shape.
  • Fig. 2 shows an analog arrangement of a sorter 1, wherein here the Inlet nozzle 2 is arranged so that the suspension parallel to Cloak of the truncated cone 3 is supplied. This allows the Energy loss that otherwise exists in flow diversion, be avoided.
  • Fig. 3 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 ca from the top of the Acceptance outlet 7, 7 'tapers conically towards the Rejektraum.
  • the pulp suspension is in turn fed via the supply nozzle 2 and in the illustrated embodiment axially guided by the rotor.
  • This type of flow is the drive-side rotor part 4 in 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 the middle Area through openings 9 from the perfused rotor part 4 'and is distributed here in both directions. It occurs like a simple one Sorter through the strainer 5, 5 'through into the accept space 6, 6', the here also doppelkonisch executed.
  • the reject flows both up and down and is here in a Rejektraum 8, 8 ' removed from the machine.
  • the Feed also in the middle from one side.
  • the accept outlet can either twice, i. above (7 ') or below (7) or simply in the middle to be appropriate.
  • the sorting machine can also be in lying form be executed.
  • Fig. 4 shows a variant of the invention, wherein as installation a perpendicular standing, about 270 ° circumferential sheet 3 'is provided.
  • This Sheet 3 ' deflects the flow of material from the inlet 2 by means of its spiral shape coming evenly into the screen basket 5.
  • Fig. 4 is this type of installation 3 'shown in plan. It can be seen that the sheet 3 'at Point 16 begins and then spirally around the midpoint (the axis) goes to point 17.
  • the room 15 (shown hatched) between Sheet 3 'and outer wall of the sorter can remain free. Essential is that the flow area is continuously reduced and thus given a largely uniform flow velocity is adapted to the inflow of the suspension in the strainer 5 is.
  • Fig. 5 shows the 3-D representation of a further variant of the invention.
  • Installation 3 "is attached to the lid, with the surface spiraling in Direction of the screen basket runs.
  • the pulp suspension is from the Inlet 2 ago on the screen basket facing surface directly into the Guided strainer, whereby the outflow is taken into account here, too, that the flow rate is practically constant. Thereby Energy losses can be minimized.
  • Fig. 6 now shows the upper part of a sorter 1 with an integrated Presorting.
  • the sorter 1 via the inlet nozzle 2 the Supplied pulp suspension.
  • a Vorsortier Scheme 10 provided in the suspension passes through a sieve 11. This allows specific heavy parts and large-scale contaminations that come from polluted or high contaminated pulp, be removed well.
  • a rotor 12 runs along with the rotor 4 via a Extension 13 is connected. The heavy parts leave the pre-sorting area through a nozzle 14.
  • the rotor 12 can in Vorsortier Scheme 10 both in the feed stream (as shown) or in the accept stream, then a further fine sorting in the lower part of the Sorter 1 is fed, run. Does the rotor 12 in the feed stream, so become strong by the rotating cleaning blades of the rotor 12 Abrasive abrasive particles are held on the surface of the Turn sieves 11 open and damage them.
  • Fig. 7 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)
  • Combined Means For Separation Of Solids (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

A screen for cleaning a pulp suspension includes a stationary installation in the infeed area between the infeed branch and the free end of the rotor.</PTEXT>

Description

Die Erfindung betrifft einen Sortierer zur Reinigung einer Faserstoffsuspension.The invention relates to a sorter for cleaning a Fibrous suspension.

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. 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 einen 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, auf. Ein weiterer Sortierer ist aus der WO 97/41296 bekannt. Hier wird in einem horizontalen Sortierer ein zylindrischer Rotor vorgesehen, wobei die Suspensionszufuhr über einen mittig angebrachten Stutzen und einen Zylinderspalt erfolgt, an dessem Ende eine Schwertteilabscheidung vorgesehen ist. Durch diese Anordnung wird mit den Schwerteilen auch ein erheblicher Anteil der Suspension mit ausgetragen. Die restliche Suspension wird in Richtung Rotor geleitet, wobei hier zusätzliche Schaufeln vorgesehen sind und die Supension mit hohem Energieaufwand in den kleinen Spalt zwischen Rotor und Siebkorb geführt werden muss. Die US 3 053 391 zeigt einen Sortierer, bei dem Suspension von aussen durch ein Sieb nach innen geführt wird, wobei am äußeren Umfang des Siebkorbes rotierende Schaber vorgesehen sind. Auch hier ist ein hoher Energieaufwand nötig und es erfolgt eine ungleichmäßige Anströmung der Suspension über die Höhe des Siebkorbes.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. In general, such a sorter designed rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually with holes or vertical slots provided and a rotating rotor. The task of the rotor is to keep the Sieve slots, which by just at the Sieboberfläche rotating wings is reached. The accept stream is in a so-called acceptance space, which is often conical, collected and radial in one place deducted. The reject stream is generally at the inlet opposite side of the screen basket in a mostly annular Reject space out and subtracted tangentially from this. Such a Sorter is e.g. from US 4,268,381. The disadvantage of this Sorting machines is that by a relatively large Executed Rejektraum the risk of clogging at low Flow rates occurs. Furthermore, an uneven occurs Flow of the strainer basket and uneven Flow conditions in acceptance space, especially in the area of Acceptance, on. Another sorter is known from WO 97/41296 known. Here, in a horizontal sorter, becomes a cylindrical rotor provided, the suspension supply via a centrally mounted Spigot and a cylinder gap takes place, at its end a Sword part separation is provided. By this arrangement is with the heavy parts also a significant proportion of the suspension discharged. The remaining suspension is directed towards the rotor, here additional blades are provided and the suspension with high energy consumption in the small gap between rotor and strainer basket must be led. US 3,053,391 shows a sorter in which Suspension is led from the outside through a sieve inwards, whereby on outer circumference of the screen basket rotating scraper are provided. Again, a high energy consumption is necessary and there is a Uneven flow of the suspension over the height of the Screen basket.

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 Zulaufbereich zwischen Rohrstutzen und dem freien Ende des Rotors ein geschlossener stationärer Einbau vorgesehen ist, der die Faserstoffsuspension in den Raum zwischen parabelförmigen Rotor und zylindrischen Sieb umlenkt, wobei der stationäre Einbau rotationssymmetrisch ausgeführt sein kann. Dadurch wird eine wesentliche Verbesserung der Strömungsverhältnisse und in weiterer Folge eine Verringerung der eingesetzten Energie erreicht.The invention is therefore characterized in that in the inlet area between pipe socket and the free end of the rotor a closed stationary installation is provided, the pulp suspension in the Space between parabolic rotor and cylindrical sieve deflects, wherein the stationary installation can be rotationally symmetrical. This will significantly improve the flow conditions and subsequently achieved a reduction in the energy used.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass der Einbau ein Kegel, ein Kegelstumpf, Halbkugel, Kugelsegment, Kugelschicht, Paraboloid oder zweischaliges Hyperboloid ist. An advantageous development of the invention is characterized in that that the installation a cone, a truncated cone, hemisphere, spherical segment, Sphere layer, paraboloid or bivalve hyperboloid.

Eine günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass bei einem Einbau als Kegel oder Kegelstumpf der Kegelwinkel α zwischen 10° und 60° beträgt.A favorable embodiment of the invention is characterized in that that when installed as a cone or truncated cone, the cone angle α between 10 ° and 60 °.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, dass die Achse des Zulaufstutzens parallel zum Kegelmantel angeordnet ist. Dadurch kann die Strömung besser geführt werden und die Energieverluste weiter verringert werden.A favorable development of the invention is characterized in that that the axis of the inlet nozzle is arranged parallel to the conical surface is. This allows the flow to be better managed and the Energy losses are further reduced.

Eine günstige alternative Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der Einbau ein spiralförmiger Körper ist, wobei die Steigung der Spirale derart gewählt werden kann, dass die Strömungsgeschwindigkeit im Zulaufbereich über der gesamten Sortierkorbbreite konstant ist. A favorable alternative embodiment of the invention is characterized characterized in that the installation is a spiral body, wherein the Slope of the spiral can be chosen such that the Flow velocity in the inlet area over the entire Bin width is constant.

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 distributed on the rotor 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, Fig. 2 eine alternative Ausgestaltung der Erfindung, Fig. 3 eine Ausführung einer Doppelmaschine, Fig. 4 eine weitere Variante der Erfindung, Fig. 5 eine 3-D-Darstellung einer Variante der Erfindung, Fig. 6 den Bereich für eine integrierte Vorsortierung, Fig. 7 ein Diagramm der Abhängigkeit der spezifischen Energie zur Siebdurchströmung und Fig. 8 ein Diagramm der Schmutzpunktreduktion zur Siebdurchströmung darstellt.The invention will now be exemplified with reference to the drawings where in Fig. 1 shows an embodiment of the invention, Fig. 2 an alternative embodiment of the invention, Fig. 3 shows an embodiment of a Double machine, Fig. 4 shows a further variant of the invention, Fig. 5 a 3-D representation of a variant of the invention, Fig. 6 shows the area for a integrated presorting, Fig. 7 is a diagram of the dependence of specific energy for Siebdurchströmung and Fig. 8 is a diagram of Dirt point reduction for Siebdurchströmung represents.

Fig. 1 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 in Richtung des Rotors 4. Der Einbau 3 kann sowohl als Hohlkörper, als auch als Vollkörper ausgebildet sein. 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 doppel-konisch ausgeführt, d.h. das Gehäuse verjüngt sich etwa ab der Ober-kante 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. 1 shows a sorter 1, 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 in the direction of the rotor 4. The Installation 3 can be designed both as a hollow body, as well as a solid body be. For optimal deflection, the flank angle is α of Truncated cone between 10 ° and 60 °. The pulp suspension enters the Space between rotor 4 and sieve 5 and passes through the sieve promoted into the accept space 6. The housing of the acceptance space is Double-conical executed, i. the case tapers off 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 achsiale 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. He has the form 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. 2 zeigt eine analoge Anordnung eines Sortierers 1, wobei hier der Zulaufstutzen 2 so angeordnet ist, daß die Suspension parallel zum Mantel des Kegelstumpfes 3 zugeführt wird. Dadurch kann der Energieverlust, der sonst bei Strömungsumlenkung vorhanden ist, vermieden werden.Fig. 2 shows an analog arrangement of a sorter 1, wherein here the Inlet nozzle 2 is arranged so that the suspension parallel to Cloak of the truncated cone 3 is supplied. This allows the Energy loss that otherwise exists in flow diversion, be avoided.

Fig. 3 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 7, 7' 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. 3 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 ca from the top of the Acceptance outlet 7, 7 'tapers conically towards the Rejektraum. The pulp suspension is in turn fed via the supply nozzle 2 and in the illustrated embodiment axially guided by the rotor. at This type of flow is the drive-side rotor part 4 in 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 the middle Area through openings 9 from the perfused rotor part 4 'and is distributed here in both directions. It occurs like a simple one Sorter through the strainer 5, 5 'through into the accept space 6, 6', the here also doppelkonisch executed. The reject flows both up and down and is here in a Rejektraum 8, 8 ' removed from the machine. In another embodiment, the Feed also in the middle from one side. The accept outlet can either twice, i. above (7 ') or below (7) or simply in the middle to be appropriate. The sorting machine can also be in lying form be executed.

Fig. 4 zeigt eine Variante der Erfindung, wobei als Einbau ein senkrecht stehendes, um ca. 270° umlaufendes Blech 3' vorgesehen ist. Dieses Blech 3' lenkt mittels seiner Spiralform den Stofffluss vom Einlauf 2 kommend gleichmäßig in den Siebkorb 5. In Fig. 4 ist diese Art des Einbaus 3' in Aufsicht dargestellt. Es ist erkennbar, dass das Blech 3' bei Punkt 16 beginnt und dann spiralförmig um den Mittelpunkt (die Achse) bis zu Punkt 17 verläuft. Der Raum 15 (schraffiert dargestellt) zwischen Blech 3' und Außenwand des Sortierers kann dabei frei bleiben. Wesentlich ist, dass sich der Strömungsquerschnitt kontinuierlich verringert und somit eine weitestgehend gleichmäßige Strömungsgeschwindigkeit gegeben ist, die an den Zufluss der Suspension in den Siebkorb 5 angepasst ist.Fig. 4 shows a variant of the invention, wherein as installation a perpendicular standing, about 270 ° circumferential sheet 3 'is provided. This Sheet 3 'deflects the flow of material from the inlet 2 by means of its spiral shape coming evenly into the screen basket 5. In Fig. 4 is this type of installation 3 'shown in plan. It can be seen that the sheet 3 'at Point 16 begins and then spirally around the midpoint (the axis) goes to point 17. The room 15 (shown hatched) between Sheet 3 'and outer wall of the sorter can remain free. Essential is that the flow area is continuously reduced and thus given a largely uniform flow velocity is adapted to the inflow of the suspension in the strainer 5 is.

Fig. 5 zeigt die 3-D-Darstellung einer weiteren Variante der Erfindung. Der Einbau 3" ist am Deckel angebracht, wobei die Oberfläche spiralförmig in Richtung des Siebkorbes verläuft. Die Faserstoffsuspension wird vom Einlauf 2 her an der dem Siebkorb zugewandten Fläche direkt in den Siebkorb gelenkt, wobei auch hier der Abfluss derart berücksichtigt ist, dass die Strömungsgeschwindigkeit praktisch konstant ist. Dadurch können Energieverluste minimiert werden.Fig. 5 shows the 3-D representation of a further variant of the invention. Of the Installation 3 "is attached to the lid, with the surface spiraling in Direction of the screen basket runs. The pulp suspension is from the Inlet 2 ago on the screen basket facing surface directly into the Guided strainer, whereby the outflow is taken into account here, too, that the flow rate is practically constant. Thereby Energy losses can be minimized.

Fig. 6 zeigt nun den oberen Teil eines Sortierers 1 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. Damit können spezifisch schwere Teile und großflächige Verunreingigungen, die aus verschmutzten bzw. hoch verschmutzten Faserstoffen resultieren, gut entfernt werden. Außerhalb des Siebes 11 läuft ein Rotor 12 mit, der mit dem Rotor 4 über einen Fortsatz 13 verbunden ist. 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. 6 now shows the upper part of a sorter 1 with an integrated Presorting. Here, the sorter 1 via the inlet nozzle 2 the Supplied pulp suspension. In order to pre-sort a Heavy separation is at the top of the Sorter 1 a Vorsortierbereich 10 provided in the suspension passes through a sieve 11. This allows specific heavy parts and large-scale contaminations that come from polluted or high contaminated pulp, be removed well. Outside of the screen 11, a rotor 12 runs along with the rotor 4 via a Extension 13 is connected. The heavy parts leave the pre-sorting area through a nozzle 14. The rotor 12 can in Vorsortierbereich 10 both in the feed stream (as shown) or in the accept stream, then a further fine sorting in the lower part of the Sorter 1 is fed, run. Does the rotor 12 in the feed stream, so become strong by the rotating cleaning blades of the rotor 12 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. 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, have a lower abrasion and energy intake and thus employed closer to the screen surface of the screen 5 can be without damaging the rotor or the Sieboberfläche to be triggered. The separate discharge of coarse and smaller impurities leads to increased performance (throughput and increase in efficiency) compared to conventional sorting machines. For high production rates, this variant can also be equipped with a Bicone rotor are running.

Fig. 7 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. 7 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. 8 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. 8, 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 (18)

  1. Screen for cleaning a pulp suspension, with a parabolic rotor, a stationary cylindrical screen basket and an accept area arranged outside of it as well as a reject outlet, where the pulp suspension is led to the inner area of the screen basket between the rotor and the screen, characterized by a closed, stationary baffle (3, 3', 3") being provided in the infeed area between the tube branch (2) and the free end of the rotor (4), which deflects the pulp suspension to the area between the parabolic rotor (4) and the cylindrical screen (5).
  2. Device according to Claim 1, characterized by the baffle (3) being designed rotationally symmetrically.
  3. Device according to Claim 2, characterized by the baffle (3) being a cone, truncated cone, hemisphere, spherical segment, spherical segment between two parallel circles, a paraboloid, or a hyperboloid of two sheets.
  4. Device according to Claim 2, with a baffle in the form of a cone or truncated cone, characterized by the cone angle α amounting to between 10° and 60°.
  5. Device according to Claim 4, characterized by the axis of the infeed branch (2) being arranged in parallel to the cone shell.
  6. Device according to Claim 1, characterized by the baffle (3', 3") being a spiral-shaped body.
  7. Device according to Claim 6, characterized by the pitch of the spiral being selected such that the flow speed in the infeed area is kept constant over the entire screen basket width.
  8. Device according to one of the Claims 1 to 7, characterized by the baffle (3, 3', 3") being arranged centrically.
  9. Device according to one of claims 1 to 7, characterized by the accept area (6, 6') being designed double-conically.
  10. Device according to Claim 1 to 9, characterized by the screen (1) being designed as double machine.
  11. Device according to Claim 10, characterized by the infeed taking place axially through the rotor (4).
  12. Device according to Claim 11, 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 side, and into which and through which the pulp flows.
  13. Device according to Claim 12, characterized by the infeed taking place centrally from the side.
  14. Device according to one of the Claims 10 to 13, characterized by two accept discharges (7, 7') being provided.
  15. Device according to one of the Claims 1 to 14, characterized by the screen (1) being arranged horizontally.
  16. Device according to one of the Claims 1 to 15, characterized by a screen basket (11) which turns together with the rotor (12) being provided for pre-screening in the infeed area.
  17. Device according to Claim 16, characterized by rotating blades being provided in the pre-screening area (10).
  18. Device according to one of the Claims 1 to 17, characterized by the rotor (4, 4') having several blades arranged at different heights and/or distributed over the circumference.
EP01101939A 2000-02-03 2001-01-29 Screen for purification of fibrous pulp Expired - Lifetime EP1124003B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT01101939T ATE295446T1 (en) 2000-02-03 2001-01-29 SCREENER FOR CLEANING A FIBER SUSPENSION

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1702000 2000-02-03
AT0017000A AT408772B (en) 2000-02-03 2000-02-03 SORTER FOR CLEANING A FIBER SUSPENSION

Publications (3)

Publication Number Publication Date
EP1124003A2 EP1124003A2 (en) 2001-08-16
EP1124003A3 EP1124003A3 (en) 2001-11-21
EP1124003B1 true EP1124003B1 (en) 2005-05-11

Family

ID=3655604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01101939A Expired - Lifetime EP1124003B1 (en) 2000-02-03 2001-01-29 Screen for purification of fibrous pulp

Country Status (9)

Country Link
US (1) US6631809B2 (en)
EP (1) EP1124003B1 (en)
CN (1) CN1180159C (en)
AT (2) AT408772B (en)
BR (1) BR0100354A (en)
CA (1) CA2333800A1 (en)
DE (1) DE50106153D1 (en)
ES (1) ES2242662T3 (en)
MX (1) MXPA01001294A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2444486C (en) * 2001-04-16 2013-04-02 J & L Fiber Services, Inc. Screen cylinder and method
DE10233364C1 (en) * 2002-07-23 2003-12-24 Voith Paper Patent Gmbh Pressure sorter for sieving a fiber suspension
AT413390B (en) 2003-03-27 2006-02-15 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
JP2005171449A (en) * 2003-12-15 2005-06-30 Aikawa Iron Works Co Ltd Screen device for papermaking
DE102011079230A1 (en) * 2011-07-15 2013-01-17 Voith Patent Gmbh pressure screens

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
SU606635A1 (en) * 1976-02-11 1978-05-15 Государственный проектно-конструкторский институт "Гипромашуглеобогащение" Screen
US4268381A (en) * 1979-05-03 1981-05-19 Uniweld Inc. Rotary pulp screening device of the vertical pressure type
CA1238604A (en) * 1983-12-12 1988-06-28 Anthony W. Hooper Rotary pulp screen of the vertical pressure type having pulp stock feed at different axial positions on the screen
US5061370A (en) * 1990-03-20 1991-10-29 Quebec And Ontario Paper Company Ltd. Screening device for slurries with improved rotor and hub design
DE4135854A1 (en) * 1991-10-31 1993-05-06 J.M. Voith Gmbh, 7920 Heidenheim, De SORTER
FI91648C (en) * 1993-01-11 1994-07-25 Tampella Oy Valmet An arrangement in a pressure sorter for separating impurities from the pulp fed to it
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

Also Published As

Publication number Publication date
CN1180159C (en) 2004-12-15
EP1124003A2 (en) 2001-08-16
ATE295446T1 (en) 2005-05-15
AT408772B (en) 2002-03-25
DE50106153D1 (en) 2005-06-16
US20010022284A1 (en) 2001-09-20
BR0100354A (en) 2001-10-02
ES2242662T3 (en) 2005-11-16
CN1314515A (en) 2001-09-26
MXPA01001294A (en) 2005-08-16
ATA1702000A (en) 2001-07-15
EP1124003A3 (en) 2001-11-21
US6631809B2 (en) 2003-10-14
CA2333800A1 (en) 2001-08-03

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