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EP2202052A1 - Method and device for dehydrating and dispersing a fibrous material - Google Patents

Method and device for dehydrating and dispersing a fibrous material Download PDF

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Publication number
EP2202052A1
EP2202052A1 EP09015772A EP09015772A EP2202052A1 EP 2202052 A1 EP2202052 A1 EP 2202052A1 EP 09015772 A EP09015772 A EP 09015772A EP 09015772 A EP09015772 A EP 09015772A EP 2202052 A1 EP2202052 A1 EP 2202052A1
Authority
EP
European Patent Office
Prior art keywords
screw
dewatering
plug screw
pulp
plug
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09015772A
Other languages
German (de)
French (fr)
Other versions
EP2202052B1 (en
Inventor
Friedrich Hoppl
Alexander Dipl. Ing. Gscheider
Peter Dipl. Ing. Janisch
Gerhard Knes
Gernot Weilharter
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Andritz AG
Original Assignee
Andritz AG
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Publication date
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Publication of EP2202052A1 publication Critical patent/EP2202052A1/en
Application granted granted Critical
Publication of EP2202052B1 publication Critical patent/EP2202052B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/004—Methods of beating or refining including disperging or deflaking

Definitions

  • the invention relates to a method for dewatering and dispersing a pulp, in particular a paper pulp, in which the pulp is fed to a Disperger for dispersion via a plug screw and a feed screw directly adjacent to the plug screw. It also relates to a device for carrying out the method.
  • Such a method and such a device are for example from the AT 411 604 B known.
  • the pre-dewatered pulp suspension to be treated is dehydrated in a screw press and fed to a disperser via a shaft of a plug screw or, subsequently, a feed screw.
  • the task of a plug screw is to produce before the Disperger from the pulp a plug, which serves as a vapor barrier. This vapor barrier is necessary so that steam that is fed in Disperger or a feed screw before the Disperger, can not escape in the direction of screw extruder.
  • the pre-dewatering in front of the screw press is usually carried out by disc filters, belt presses, disc presses or drum thickeners.
  • the final dewatering via the screw press before the disperser has the disadvantage that the achievable degree of dewatering of the pulp suspension is limited or can be compensated by the dewatering in the screw press consistency fluctuations of the pulp difficult. It would therefore be desirable to be able to improve the dewatering of the pulp suspension prior to dispersion without, however, having to expend additional energy.
  • the aim of the invention is to propose a method with which an improved compared to the prior art drainage is enabled and this with the same energy consumption.
  • the method according to the invention is characterized in that the pulp is first pre-dewatered in a dewatering unit in front of the stuffing screw and then additionally dewatered in the stuffing screw.
  • the pulp is very strongly compressed or compressed to produce the plug in the plug screw. This pressure is used within the scope of this invention for additional drainage without the need for additional energy. Ideally, energy can be saved compared to conventional systems. Due to the additional dewatering in the plug screw, the dry content can be increased and consistency fluctuations of the fiber can be compensated. Alternatively, a possibly upstream screw press can be made smaller and therefore more energy-efficient (lower dry-run content necessary as the dewatering screw can raise it to the desired value).
  • the pre-dewatering of the pulp can be carried out before the stuffing screw with a disc filter, wherein a direct subsequent dewatering step is performed with the plug screw. So no further dewatering steps are carried out between the disc filter and the plug screw. A screw press in front of the screw conveyor is therefore no longer provided in this embodiment, resulting in significant energy and cost savings.
  • the pre-dewatered pulp is dewatered via drainage openings in a plug screw housing.
  • the resulting filtrate can then be easily collected via a Filtratwanne under the plug screw.
  • the pre-dewatered pulp can also be dewatered via drainage openings in a plug screw hollow shaft.
  • the filtrate can be well discharged via the hollow shaft.
  • the pulp is dewatered from both sides, ie via the drainage openings in the plug screw housing and via the drainage openings in the plug screw hollow shaft.
  • the pulp after the stuffing screw steam preferably in the feed screw, is supplied.
  • the pulp is heated and thereby improves the dispersion in Disperger.
  • the invention also provides a corresponding device for dewatering and dispersion of a pulp with a plug screw, a feed screw and a disperser, wherein the plug screw is connected directly to the feed screw and the feed screw is arranged directly in front of the disperser.
  • the plug screw on drainage openings for dewatering of the pulp, wherein before the plug screw, a dewatering unit for pre-dewatering of the pulp is arranged.
  • the dewatering unit for pre-dewatering a disc filter, wherein after the disc filter directly the stuffing screw is arranged. So no further dewatering units, such as a screw press, are arranged in front of the stuffing screw. The absence of a screw press leads to significant energy and cost savings.
  • the drainage openings are arranged in the plug screw housing.
  • the drainage openings for maintenance and cleaning work are easily accessible.
  • the drainage openings are provided in the region of the plug screw housing, in which the Faserstoffpfropfen forms during operation, since there prevail the highest dewatering pressures.
  • the drainage openings are arranged in the hollow shaft shell of the stuffing screw hollow shaft. As a result, the filtrate can be removed particularly easily through the hollow shaft.
  • the drainage holes may be provided both in the plug screw housing and in the hollow shaft.
  • a system according to the prior art is shown.
  • the pulp to be treated is pre-dewatered in a pre-dewatering device 11 1 and fed to a screw press 7 for further dewatering.
  • the pre-dewatering device 11 can be formed by a disk filter 11 'or by a belt press, a disk press or a drum thickener.
  • the screw press 7 is driven by the screw press drive 8.
  • the dewatered pulp falls through the shaft 6 in the underlying stuffing screw 1.
  • the plug screw 1 is driven by the plug screw drive 5.
  • the pulp is compressed, so that forms a gas-tight Faserstoffpfropfen 10, which serves as a vapor barrier, in particular in the end region of the screw plug.
  • this pulp plug 10 is facilitated by the conical plug screw housing 13, which tapers towards the plug screw end.
  • the vapor barrier is necessary so that steam which is supplied in the disperser 2 or in the feed screw 9 can not escape in the direction of the screw press 7.
  • the feed screw 9 can have special claws or mandrels in the inlet region, which rasp the fibrous plug 10 coming out of the plug screw 1, so that as rapid as possible heating of the resulting fiber flakes is made possible.
  • steam is introduced into the feed screw 9, so that the fibrous material is heated directly in front of the disperser 2.
  • the feed screw 9 is thus also a heating and mixing device.
  • the disperser 2 can be opened by pivoting away the feed screw 9.
  • the dash-dotted representation shows the weggeschwenkte feed screw 9 '.
  • the disperser 2 is connected via a Dispergergetriebe 3 with the motor 4.
  • Fig. 2 shows a side view of the device according to the invention.
  • the plug screw 1 is as in FIG. 1 is arranged after a pre-dewatering device 11 and a screw press 7 and is located directly in front of the feed screw 9 and is directly connected to this.
  • the feed screw 9 is in turn connected directly to the disperser 2 and may also supply means 15, 15 'for steam. Of course, the steam can also be supplied directly in the disperser 2.
  • the plug screw 1 has drainage openings 12, 12 'for dewatering the fibrous material.
  • the dewatering openings 12 are located in the plug screw housing 13.
  • the plug screw 1 a Stopfschneckenhohlwelle 14, wherein in the hollow shaft casing 16 also drainage openings 12 'are provided.
  • the water or the filtrate can be discharged via the stuffing screw hollow shaft 14 from the screw conveyor 1 and discharged via the drainage line 18.
  • the filtrate from the drainage openings 12 of the plug screw housing 13 is collected and removed via the collecting container 19.
  • Fig. 2 the drainage openings 12, 12 'over the entire length of the plug screw housing 13 and the Stopfschneckenhohlwelle 14 are arranged.
  • the drainage openings 12, 12 ' are preferably located in the last third or in the region of the stuffing screw 1, in which the Faserstoffpfropfen 10 forms. This is advantageous because the highest dewatering pressures prevail there.
  • the pulp is pre-dewatering after a pre-drainage in the pre-dewatering device 11 and a Screw press 7 fed to further drainage.
  • the partially dewatered pulp then falls over the shaft 6 into the fabric screw 1, in which a Faserstoffpfropfen 10 is formed with simultaneous further drainage.
  • the resulting in the plug screw 1 filtrate is discharged through the drainage holes 12 in the plug screw housing 13 and via the drainage holes 12 'in the plug screw hollow shaft 14.
  • the drainage in the plug screw 1 can be controlled via the valve 17.
  • After the valve 17 may also be provided a vacuum device for generating negative pressure.
  • the dewatering in the plug screw 1 is supported by the suction effect in the stuffing screw hollow shaft 14 and in the collecting container 19.
  • Fig. 3 shows a side view of another variant of the device according to the invention.
  • the construction is in the Fig. 2 Similarly, however, the pre-dewatering device 11 is connected directly to the plug screw 1.
  • a dewatering screw 7 is no longer provided, since a sufficient dry content of the pulp can be achieved by the combination of the pre-dewatering device 11 with the screw conveyor 1.
  • disc filters 11 ', belt presses, disk presses or drum thickeners come into question as pre-dewatering devices 11.
  • a disc filter 11 'with vacuum-assisted drainage according to the German patent application DE 10 2008 022 206 A1 is particularly suitable as a pre-dewatering device 11, as can be achieved with this disc filter 11 'particularly high dry contents.
  • Fig. 4 a section through the plug screw 1 according to the invention is shown. It can be seen clearly the drainage holes 12 'in the hollow shaft shell 16 of the plug screw hollow shaft 14. On the plug screw hollow shaft 14, the screw 20 for the promotion and Compression of the pulp attached.
  • the fibrous plug 10 is formed in the area between the plug screw hollow shaft 14 and the plug screw housing 13.
  • the drainage holes 12 in the plug screw housing 13 are provided in the present example only on the underside of the plug screw 1, but preferably they are arranged on the entire circumference.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtration Of Liquid (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

The method involves supplying a fibrous material over a stiffening screw (1), and dispensing a feed screw (9) directly by a dispenser (2), where the feed screw is provided adjacent to the stiffening screw. The fibrous material is pre-dehydrated in dehydrating modules (7, 11) before the stiffening screw and is dehydrated in the stiffening screw. An initial dehydration of the fibrous material is performed by a disc filter before the stiffening screw, and a directly processed dehydration process is performed by the stiffening screw. An independent claim is also included for a device for dehydrating and dispersing fibrous material, comprising a stiffing screw.

Description

Die Erfindung betrifft ein Verfahren zur Entwässerung und Dispergierung eines Faserstoffes, insbesondere eines Papierfaserstoffes, bei dem der Faserstoff über eine Stopfschnecke und eine direkt an die Stopfschnecke anschließende Zuführschnecke einem Disperger zur Dispergierung zugeführt wird. Sie betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for dewatering and dispersing a pulp, in particular a paper pulp, in which the pulp is fed to a Disperger for dispersion via a plug screw and a feed screw directly adjacent to the plug screw. It also relates to a device for carrying out the method.

Ein derartiges Verfahren bzw. eine derartige Vorrichtung sind z.B. aus der AT 411 604 B bekannt. Hier wird die zu behandelnde vorentwässerte Faserstoffsuspension in einer Schneckenpresse entwässert und über einen Schacht einer Stopfschnecke bzw. in weiterer Folge einer Zuführschnecke einem Disperger zugeführt. Die Aufgabe einer Stopfschnecke ist es, vor dem Disperger aus dem Faserstoff einen Propfen zu erzeugen, der als Dampfsperre dient. Diese Dampfsperre ist notwendig, damit Dampf, der im Disperger oder einer Zuführschnecke vor dem Disperger zugeführt wird, nicht in Richtung Schneckenpresse entweichen kann. Die Vorentwässerung vor der Schneckenpresse erfolgt in der Regel durch Scheibenfilter, Siebbandpressen, Scheibenpressen oder Trommeleindickern.Such a method and such a device are for example from the AT 411 604 B known. Here, the pre-dewatered pulp suspension to be treated is dehydrated in a screw press and fed to a disperser via a shaft of a plug screw or, subsequently, a feed screw. The task of a plug screw is to produce before the Disperger from the pulp a plug, which serves as a vapor barrier. This vapor barrier is necessary so that steam that is fed in Disperger or a feed screw before the Disperger, can not escape in the direction of screw extruder. The pre-dewatering in front of the screw press is usually carried out by disc filters, belt presses, disc presses or drum thickeners.

Die endgültige Entwässerung über die Schneckenpresse vor dem Disperger hat den Nachteil, dass der erreichbare Entwässerungsgrad der Faserstoffsuspension begrenzt ist bzw. können durch die Entwässerung in der Schneckenpresse Konsistenzschwankungen des Faserstoffes nur schwer ausgeglichen werden. Es wäre daher wünschenswert, wenn man die Entwässerung der Faserstoffsuspension vor der Dispergierung verbessern könnte, ohne jedoch zusätzlich Energie aufwenden zu müssen.The final dewatering via the screw press before the disperser has the disadvantage that the achievable degree of dewatering of the pulp suspension is limited or can be compensated by the dewatering in the screw press consistency fluctuations of the pulp difficult. It would therefore be desirable to be able to improve the dewatering of the pulp suspension prior to dispersion without, however, having to expend additional energy.

Ziel der Erfindung ist es, ein Verfahren vorzuschlagen, mit dem eine gegenüber dem Stand der Technik verbesserte Entwässerung ermöglicht wird und dies bei gleichem Energieaufwand.The aim of the invention is to propose a method with which an improved compared to the prior art drainage is enabled and this with the same energy consumption.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass der Faserstoff zuerst in einem Entwässerungsaggregat vor der Stopfschnecke vorentwässert und danach in der Stopfschnecke zusätzlich entwässert wird.The method according to the invention is characterized in that the pulp is first pre-dewatered in a dewatering unit in front of the stuffing screw and then additionally dewatered in the stuffing screw.

Der Faserstoff wird zur Erzeugung des Pfropfens in der Stopfschnecke sehr stark zusammengepresst bzw. komprimiert. Dieser Druck wird im Rahmen dieser Erfindung für eine zusätzliche Entwässerung verwendet, ohne dass dabei zusätzliche Energie aufgewendet werden muss. Im Idealfall kann gegenüber herkömmlichen Systemen sogar Energie eingespart werden. Durch die zusätzliche Entwässerung in der Stopfschnecke kann der Trockengehalt erhöht und Konsistenzschwankungen des Faserstoffes ausgeglichen werden. Beziehungsweise kann eine eventuell vorgeschaltete Schneckenpresse kleiner und daher energiesparender ausgeführt werden (geringerer Auslauftrockengehalt notwendig, da die Entwässerungsstopfschnecke diesen auf den gewünschten Wert anheben kann).The pulp is very strongly compressed or compressed to produce the plug in the plug screw. This pressure is used within the scope of this invention for additional drainage without the need for additional energy. Ideally, energy can be saved compared to conventional systems. Due to the additional dewatering in the plug screw, the dry content can be increased and consistency fluctuations of the fiber can be compensated. Alternatively, a possibly upstream screw press can be made smaller and therefore more energy-efficient (lower dry-run content necessary as the dewatering screw can raise it to the desired value).

In einer günstigen Ausführung des Verfahrens kann die Vorentwässerung des Faserstoffes vor der Stopfschnecke mit einem Scheibenfilter durchgeführt werden, wobei ein direkt nachfolgender Entwässerungsschritt mit der Stopfschnecke durchgeführt wird. Zwischen dem Scheibenfilter und der Stopfschnecke werden also keine weiteren Entwässerungsschritte durchgeführt. Eine Schneckenpresse vor der Stopfschnecke ist somit bei dieser Ausführung nicht mehr vorgesehen, was zu erheblichen Energie- und Kosteneinsparungen führt.In a favorable embodiment of the method, the pre-dewatering of the pulp can be carried out before the stuffing screw with a disc filter, wherein a direct subsequent dewatering step is performed with the plug screw. So no further dewatering steps are carried out between the disc filter and the plug screw. A screw press in front of the screw conveyor is therefore no longer provided in this embodiment, resulting in significant energy and cost savings.

Vorteilhafterweise wird der vorentwässerte Faserstoff über Entwässerungsöffnungen in einem Stopfschneckengehäuse entwässert. Das anfallende Filtrat kann dann einfach über eine Filtratwanne unter der Stopfschnecke aufgefangen werden.Advantageously, the pre-dewatered pulp is dewatered via drainage openings in a plug screw housing. The resulting filtrate can then be easily collected via a Filtratwanne under the plug screw.

Der vorentwässerte Faserstoff kann auch über Entwässerungsöffnungen in einer Stopfschneckenhohlwelle entwässert werden. Das Filtrat kann dabei gut über die Hohlwelle abgeleitet werden. Es ist natürlich auch denkbar, dass der Faserstoff von beiden Seiten, also über die Entwässerungsöffnungen im Stopfschneckengehäuse und über die Entwässerungsöffnungen in der Stopfschneckenhohlwelle entwässert wird.The pre-dewatered pulp can also be dewatered via drainage openings in a plug screw hollow shaft. The filtrate can be well discharged via the hollow shaft. Of course, it is also conceivable that the pulp is dewatered from both sides, ie via the drainage openings in the plug screw housing and via the drainage openings in the plug screw hollow shaft.

Es ist vorteilhaft, wenn die Entwässerung in der Stopfschnecke im letzten Drittel der Stopfschnecke durchgeführt wird, da im Endabschnitt der höchste Entwässerungsdruck und somit die beste Entwässerungsleistung vorherrscht.It is advantageous if the dewatering in the plug screw is carried out in the last third of the plug screw, since in the end portion of the highest dewatering pressure and thus the best dewatering performance prevails.

Es ist sinnvoll, wenn dem Faserstoff nach der Stopfschnecke Dampf, vorzugsweise im Bereich der Zuführschnecke, zugeführt wird. Durch die Dampfzufuhr wird der Faserstoff erwärmt und dadurch die Dispergierung im Disperger verbessert.It is useful if the pulp after the stuffing screw steam, preferably in the feed screw, is supplied. By the steam supply, the pulp is heated and thereby improves the dispersion in Disperger.

Gegenstand der Erfindung bildet auch eine entsprechende Vorrichtung zur Entwässerung und Dispergierung eines Faserstoffes mit einer Stopfschnecke, einer Zuführschnecke und einem Disperger, wobei die Stopfschnecke direkt mit der Zuführschnecke verbunden ist und die Zuführschnecke direkt vor dem Disperger angeordnet ist. Erfindungsgemäß weist bei dieser Vorrichtung die Stopfschnecke Entwässerungsöffnungen zur Entwässerung des Faserstoffes auf, wobei vor der Stopfschnecke ein Entwässerungsaggregat zur Vorentwässerung des Faserstoffes angeordnet ist.The invention also provides a corresponding device for dewatering and dispersion of a pulp with a plug screw, a feed screw and a disperser, wherein the plug screw is connected directly to the feed screw and the feed screw is arranged directly in front of the disperser. According to the invention, in this device, the plug screw on drainage openings for dewatering of the pulp, wherein before the plug screw, a dewatering unit for pre-dewatering of the pulp is arranged.

In einer vorteilhaften Ausführungsform der Vorrichtung ist das Entwässerungsaggregat zur Vorentwässerung ein Scheibenfilter, wobei nach dem Scheibenfilter unmittelbar die Stopfschnecke angeordnet ist. Vor der Stopfschnecke sind also keine weiteren Entwässerungsaggregate, wie beispielsweise eine Schneckenpresse, angeordnet. Der Verzicht auf eine Schneckenpresse führt zu erheblichen Energie- und Kosteneinsparungen.In an advantageous embodiment of the device, the dewatering unit for pre-dewatering a disc filter, wherein after the disc filter directly the stuffing screw is arranged. So no further dewatering units, such as a screw press, are arranged in front of the stuffing screw. The absence of a screw press leads to significant energy and cost savings.

In einer weiteren vorteilhaften Ausführungsform der Vorrichtung sind die Entwässerungsöffnungen im Stopfschneckengehäuse angeordnet. Dadurch sind die Entwässerungsöffnungen für Wartungs- und Reinigungsarbeiten leicht zugänglich. Vorzugsweise sind dabei die Entwässerungsöffnungen in dem Bereich des Stopfschneckengehäuses vorgesehen, in dem sich im Betrieb der Faserstoffpfropfen bildet, da dort die höchsten Entwässerungsdrücke vorherrschen.In a further advantageous embodiment of the device, the drainage openings are arranged in the plug screw housing. As a result, the drainage openings for maintenance and cleaning work are easily accessible. Preferably, the drainage openings are provided in the region of the plug screw housing, in which the Faserstoffpfropfen forms during operation, since there prevail the highest dewatering pressures.

Es ist auch denkbar, dass die Entwässerungsöffnungen im Hohlwellenmantel der Stopfschneckenhohlwelle angeordnet sind. Dadurch kann das Filtrat besonders einfach durch die Hohlwelle abgeführt werden. Natürlich können die Entwässerungsöffnungen sowohl im Stopfschneckengehäuse als auch in der Hohlwelle vorgesehen sein.It is also conceivable that the drainage openings are arranged in the hollow shaft shell of the stuffing screw hollow shaft. As a result, the filtrate can be removed particularly easily through the hollow shaft. Of course, the drainage holes may be provided both in the plug screw housing and in the hollow shaft.

Im Folgenden wird die Erfindung anhand von Zeichnungen beschrieben. Es zeigt:

  • Fig. 1 eine schematische Draufsicht auf eine Anlage nach dem Stand der Technik;
  • Fig. 2 eine Seitenansicht der erfindungsgemäßen Vorrichtung;
  • Fig. 3 eine Seitenansicht einer weiteren Variante der erfindungsgemäßen Vorrichtung;
  • Fig. 4 eine Detailansicht der erfindungsgemäßen Stopfschnecke;
In the following the invention will be described with reference to drawings. It shows:
  • Fig. 1 a schematic plan view of a plant according to the prior art;
  • Fig. 2 a side view of the device according to the invention;
  • Fig. 3 a side view of another variant of the device according to the invention;
  • Fig. 4 a detailed view of the plug screw according to the invention;

Die gleichen Bezugszeichen aller Figuren bezeichnen die gleichen Bauteile.The same reference numerals of all figures denote the same components.

In Fig. 1 ist eine Anlage nach dem Stand der Technik dargestellt. Hier wird der zu behandelnde Faserstoff in einer Vorentwässerungseinrichtung 11 1 vorentwässert und einer Schneckenpresse 7 zur weiteren Entwässerung zugeführt. Die Vorentwässerungseinrichtung 11 kann durch einen Scheibenfilter 11' oder durch eine Siebbandpresse, eine Scheibenpresse oder einen Trommeleindicker gebildet werden. Die Schneckenpresse 7 wird über den Schneckenpressenantrieb 8 angetrieben. Anschließend fällt der entwässerte Faserstoff durch den Schacht 6 in die darunter befindliche Stopfschnecke 1. Die Stopfschnecke 1 wird über den Stopfschneckenantrieb 5 angetrieben. In der Stopfschnecke 1 wird der Faserstoff komprimiert, sodass sich insbesondere im Endbereich der Stopfschnecke ein gasdichter Faserstoffpfropfen 10 bildet, der als Dampfsperre dient. Die Bildung dieses Faserstoffpfropfens 10 wird durch das konische Stopfschneckengehäuse 13, welches sich zum Stopfschneckenende hin verjüngt, begünstigt. Die Dampfsperre ist notwendig, damit Dampf, der im Disperger 2 oder in der Zuführschnecke 9 zugeführt wird, nicht in Richtung Schneckenpresse 7 entweichen kann. Nach der Stopfschnecke 1 folgt die Zuführschnecke 9, die den Faserstoff dem Disperger 2 zuführt. Die Zuführschnecke 9 kann dabei im Einlaßbereich spezielle Krallen oder Dorne aufweisen, die den aus der Stopfschnecke 1 kommenden Faserstoffpfropfen 10 aufraspeln, damit eine möglichst rasche Aufheizung der dabei entstandenen Faserflocken ermöglicht wird. Über die Leitungen 15 und 15' wird Dampf in die Zuführschnecke 9 eingeleitet, sodass der Faserstoff direkt vor dem Disperger 2 erhitzt wird. Die Zuführschnecke 9 ist somit auch eine Heiz- und Mischeinrichtung. Für Wartungsarbeiten kann der Disperger 2 durch wegschwenken der Zuführschnecke 9 geöffnet werden. Die strichpunktierte Darstellung zeigt die weggeschwenkte Zuführschnecke 9'.In Fig. 1 a system according to the prior art is shown. Here, the pulp to be treated is pre-dewatered in a pre-dewatering device 11 1 and fed to a screw press 7 for further dewatering. The pre-dewatering device 11 can be formed by a disk filter 11 'or by a belt press, a disk press or a drum thickener. The screw press 7 is driven by the screw press drive 8. Subsequently, the dewatered pulp falls through the shaft 6 in the underlying stuffing screw 1. The plug screw 1 is driven by the plug screw drive 5. In the stuffing screw 1, the pulp is compressed, so that forms a gas-tight Faserstoffpfropfen 10, which serves as a vapor barrier, in particular in the end region of the screw plug. The formation of this pulp plug 10 is facilitated by the conical plug screw housing 13, which tapers towards the plug screw end. The vapor barrier is necessary so that steam which is supplied in the disperser 2 or in the feed screw 9 can not escape in the direction of the screw press 7. After the stuffing screw 1 follows the feed screw 9, which feeds the pulp to the disperser 2. The feed screw 9 can have special claws or mandrels in the inlet region, which rasp the fibrous plug 10 coming out of the plug screw 1, so that as rapid as possible heating of the resulting fiber flakes is made possible. Via the lines 15 and 15 ', steam is introduced into the feed screw 9, so that the fibrous material is heated directly in front of the disperser 2. The feed screw 9 is thus also a heating and mixing device. For maintenance work, the disperser 2 can be opened by pivoting away the feed screw 9. The dash-dotted representation shows the weggeschwenkte feed screw 9 '.

Der Disperger 2 ist über ein Dispergergetriebe 3 mit dem Motor 4 verbunden.The disperser 2 is connected via a Dispergergetriebe 3 with the motor 4.

Fig. 2 zeigt eine Seitenansicht der erfindungsgemäßen Vorrichtung. Die Stopfschnecke 1 ist dabei wie in Figur 1 nach einer Vorentwässerungseinrichtung 11 und einer Schneckenpresse 7 angeordnet und befindet sich direkt vor der Zuführschnecke 9 und ist mit dieser direkt verbunden. Die Zuführschnecke 9 ist wiederum direkt mit dem Disperger 2 verbunden und kann auch Zuführeinrichtungen 15, 15' für Dampf aufweisen. Der Dampf kann natürlich auch direkt im Disperger 2 zugeführt werden. Wesentlich bei dieser erfindungsgemäßen Vorrichtung ist, dass die Stopfschnecke 1 Entwässerungsöffnungen 12, 12' zur Entwässerung des Faserstoffes aufweist. Die Entwässerungsöffnungen 12 befinden sich dabei im Stopfschneckengehäuse 13. Im vorliegenden Beispiel weist die Stopfschnecke 1 eine Stopfschneckenhohlwelle 14 auf, wobei im Hohlwellenmantel 16 ebenfalls Entwässerungsöffnungen 12' vorgesehen sind. Das Wasser bzw. das Filtrat kann dabei über die Stopfschneckenhohlwelle 14 aus der Stopfschnecke 1 abgeleitet und über die Entwässerungsleitung 18 abgeführt werden. Das Filtrat aus den Entwässerungsöffnungen 12 des Stopfschneckengehäuses 13 wird über den Auffangbehälter 19 aufgefangen und abgeführt. Fig. 2 shows a side view of the device according to the invention. The plug screw 1 is as in FIG. 1 is arranged after a pre-dewatering device 11 and a screw press 7 and is located directly in front of the feed screw 9 and is directly connected to this. The feed screw 9 is in turn connected directly to the disperser 2 and may also supply means 15, 15 'for steam. Of course, the steam can also be supplied directly in the disperser 2. It is essential with this device according to the invention that the plug screw 1 has drainage openings 12, 12 'for dewatering the fibrous material. The dewatering openings 12 are located in the plug screw housing 13. In the present example, the plug screw 1 a Stopfschneckenhohlwelle 14, wherein in the hollow shaft casing 16 also drainage openings 12 'are provided. The water or the filtrate can be discharged via the stuffing screw hollow shaft 14 from the screw conveyor 1 and discharged via the drainage line 18. The filtrate from the drainage openings 12 of the plug screw housing 13 is collected and removed via the collecting container 19.

In Fig. 2 sind die Entwässerungsöffnungen 12, 12' über die gesamte Länge des Stopfschneckengehäuses 13 und der Stopfschneckenhohlwelle 14 angeordnet. Es ist aber auch denkbar, dass sich die Entwässerungsöffnungen 12, 12' vorzugsweise im letzten Drittel bzw. im Bereich der Stopfschnecke 1, in dem sich der Faserstoffpfropfen 10 bildet, befinden. Dies ist vorteilhaft, da dort die höchsten Entwässerungsdrücke vorherrschen.In Fig. 2 the drainage openings 12, 12 'over the entire length of the plug screw housing 13 and the Stopfschneckenhohlwelle 14 are arranged. However, it is also conceivable that the drainage openings 12, 12 'are preferably located in the last third or in the region of the stuffing screw 1, in which the Faserstoffpfropfen 10 forms. This is advantageous because the highest dewatering pressures prevail there.

Im Betrieb wird der Faserstoff nach einer Vorentwässerung in der Vorentwässerungseinrichtung 11 vorentwässert und einer Schneckenpresse 7 zur weiteren Entwässerung zugeführt. Der teilweise entwässerte Faserstoff fällt danach über den Schacht 6 in die Stoffschnecke 1, in der ein Faserstoffpfropfen 10 bei gleichzeitiger weiterer Entwässerung gebildet wird. Das in der Stopfschnecke 1 anfallende Filtrat wird über die Entwässerungsöffnungen 12 im Stopfschneckengehäuse 13 und über die Entwässerungsöffnungen 12' in der Stopfschneckenhohlwelle 14 abgeführt. Die Entwässerung in der Stopfschnecke 1 kann dabei über das Ventil 17 gesteuert werden. Nach dem Ventil 17 kann auch eine Vakuumvorrichtung zur Unterdruckerzeugung vorgesehen sein. Die Entwässerung in der Stopfschnecke 1 wird dabei durch die Saugwirkung in der Stopfschneckenhohlwelle 14 bzw. im Auffangbehälter 19 unterstützt.In operation, the pulp is pre-dewatering after a pre-drainage in the pre-dewatering device 11 and a Screw press 7 fed to further drainage. The partially dewatered pulp then falls over the shaft 6 into the fabric screw 1, in which a Faserstoffpfropfen 10 is formed with simultaneous further drainage. The resulting in the plug screw 1 filtrate is discharged through the drainage holes 12 in the plug screw housing 13 and via the drainage holes 12 'in the plug screw hollow shaft 14. The drainage in the plug screw 1 can be controlled via the valve 17. After the valve 17 may also be provided a vacuum device for generating negative pressure. The dewatering in the plug screw 1 is supported by the suction effect in the stuffing screw hollow shaft 14 and in the collecting container 19.

Fig. 3 zeigt eine Seitenansicht einer weiteren Variante der erfindungsgemäßen Vorrichtung. Der Aufbau ist dem in Fig. 2 ähnlich, jedoch ist die Vorentwässerungseinrichtung 11 direkt mit der Stopfschnecke 1 verbunden. Eine Entwässerungsschnecke 7 ist nicht mehr vorgesehen, da durch die Kombination der Vorentwässerungseinrichtung 11 mit der Stopfschnecke 1 ein ausreichender Trockengehalt des Faserstoffes erreicht werden kann. Als Vorentwässerungseinrichtungen 11 kommen beispielsweise Scheibenfilter 11', Siebbandpressen, Scheibenpressen oder Trommeleindickern in Frage. Fig. 3 shows a side view of another variant of the device according to the invention. The construction is in the Fig. 2 Similarly, however, the pre-dewatering device 11 is connected directly to the plug screw 1. A dewatering screw 7 is no longer provided, since a sufficient dry content of the pulp can be achieved by the combination of the pre-dewatering device 11 with the screw conveyor 1. For example, disc filters 11 ', belt presses, disk presses or drum thickeners come into question as pre-dewatering devices 11.

Ein Scheibenfilter 11' mit vakuumunterstützter Entwässerung gemäß der deutschen Patentanmeldung DE 10 2008 022 206 A1 eignet sich besonders gut als Vorentwässerungseinrichtung 11, da sich mit diesem Scheibenfilter 11' besonders hohe Trockengehalte erreichen lassen.A disc filter 11 'with vacuum-assisted drainage according to the German patent application DE 10 2008 022 206 A1 is particularly suitable as a pre-dewatering device 11, as can be achieved with this disc filter 11 'particularly high dry contents.

In Fig. 4 ist ein Schnitt durch die erfindungsgemäßen Stopfschnecke 1 dargestellt. Man erkennt dabei deutlich die Entwässerungsöffnungen 12' im Hohlwellenmantel 16 der Stopfenschneckenhohlwelle 14. Auf der Stopfenschneckenhohlwelle 14 ist die Schnecke 20 zur Förderung und Komprimierung des Faserstoffes befestigt. Der Faserstoffpfropfen 10 wird im Bereich zwischen der Stopfenschneckenhohlwelle 14 und dem Stopfenschneckengehäuse 13 gebildet. Die Entwässerungsöffnungen 12 im Stopfenschneckengehäuse 13 sind im vorliegenden Beispiel nur an der Unterseite der Stopfenschnecke 1 vorgesehen, vorzugsweise sind sie aber am gesamten Umfang angeordnet.In Fig. 4 a section through the plug screw 1 according to the invention is shown. It can be seen clearly the drainage holes 12 'in the hollow shaft shell 16 of the plug screw hollow shaft 14. On the plug screw hollow shaft 14, the screw 20 for the promotion and Compression of the pulp attached. The fibrous plug 10 is formed in the area between the plug screw hollow shaft 14 and the plug screw housing 13. The drainage holes 12 in the plug screw housing 13 are provided in the present example only on the underside of the plug screw 1, but preferably they are arranged on the entire circumference.

Die in den Zeichnungen dargestellten Ausführungsformen stellen lediglich eine bevorzugte Ausführung der Erfindung dar. Die Erfindung umfasst auch andere Ausführungsformen, bei denen beispielsweise die Entwässerungsöffnungen 12, 12' nur in der Stopfenschneckenhohlwelle 14 oder nur im Stopfenschneckengehäuse 13 vorgesehen sind.The embodiments shown in the drawings represent only a preferred embodiment of the invention. The invention also encompasses other embodiments in which, for example, the drainage openings 12, 12 'are provided only in the plug screw hollow shaft 14 or only in the plug screw housing 13.

Claims (11)

Verfahren zur Entwässerung und Dispergierung eines Faserstoffes, bei dem der Faserstoff über eine Stopfschnecke (1) und eine direkt an die Stopfschnecke (1) anschließende Zuführschnecke (9) einem Disperger (2) zur Dispergierung zugeführt wird, dadurch gekennzeichnet, dass der Faserstoff zuerst in einem Entwässerungsaggregat (11,11',7) vor der Stopfschnecke (1) vorentwässert und danach in der Stopfschnecke (1) zusätzlich entwässert wird.Process for dewatering and dispersing a pulp, in which the pulp is fed via a stuffing screw (1) and a feed screw (9) directly adjoining the stuffing screw (1) to a disperser (2) for dispersion, characterized in that the pulp is first introduced in a dewatering unit (11,11 ', 7) before the plug screw (1) pre-dewatered and then dewatered in the plug screw (1). Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Vorentwässerung des Faserstoffes vor der Stopfschnecke (1) mit einem Scheibenfilter (11') durchgeführt wird und ein direkt nachfolgender Entwässerungsschritt mit der Stopfschnecke (1) durchgeführt wird.A method according to claim 1, characterized in that the pre-dewatering of the pulp in front of the stuffing screw (1) with a disc filter (11 ') is performed and a directly subsequent dewatering step with the plug screw (1) is performed. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der vorentwässerte Faserstoff über Entwässerungsöffnungen (12) in einem Stopfschneckengehäuse (13) entwässert wird.A method according to claim 1 or 2, characterized in that the pre-dewatered pulp via drainage openings (12) is dewatered in a plug screw housing (13). Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der vorentwässerte Faserstoff über Entwässerungsöffnungen (12') in einer Stopfschneckenhohlwelle (14) entwässert wird.Method according to one of claims 1 to 3, characterized in that the pre-dewatered pulp via dewatering openings (12 ') is dewatered in a Stopfschneckenhohlwelle (14). Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Entwässerung in der Stopfschnecke (1) im letzten Drittel des Stopfschneckengehäuses (13) durchgeführt wird.Method according to one of the preceding claims, characterized in that the drainage in the plug screw (1) in the last third of the plug screw housing (13) is performed. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dem Faserstoff nach der Stopfschnecke (1) Dampf, vorzugsweise im Bereich der Zuführschnecke (9), zugeführt wird.Method according to one of the preceding claims, characterized in that the fibrous material after the plug screw (1) steam, preferably in the region of the feed screw (9), is supplied. Vorrichtung zur Entwässerung und Dispergierung eines Faserstoffes mit einer Stopfschnecke (1), einer Zuführschnecke (9) und einem Disperger (2), wobei die Stopfschnecke (1) direkt mit der Zuführschnecke (9) verbunden ist und die Zuführschnecke (9) direkt vor dem Disperger (2) angeordnet ist, dadurch gekennzeichnet, dass die Stopfschnecke (1) Entwässerungsöffnungen (12, 12', 12") zur Entwässerung des Faserstoffes aufweist und dass vor der Stopfschnecke (1) ein Entwässerungsaggregat (11, 11', 7) zur Vorentwässerung des Faserstoffes angeordnet ist.Apparatus for dewatering and dispersing a pulp with a stuffing screw (1), a feed screw (9) and a disperser (2), wherein the stuffing screw (1) is directly connected to the feed screw (9) and the feed screw (9) directly in front of Disperger (2) is arranged, characterized in that the plug screw (1) drainage openings (12, 12 ', 12 ") for dewatering of the pulp and that before the plug screw (1) a dewatering unit (11, 11', 7) for Pre-dewatering of the pulp is arranged. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass das Entwässerungsaggregat zur Vorentwässerung ein Scheibenfilter (11') ist und dass nach dem Scheibenfilter (11') unmittelbar die Stopfschnecke (1) angeordnet ist.Apparatus according to claim 7, characterized in that the dewatering unit for pre-dewatering a disc filter (11 ') and that after the disc filter (11') directly the plug screw (1) is arranged. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Stopfschnecke (1) ein Stopfschneckengehäuse (13) aufweist und dass die Entwässerungsöffnungen (12) im Stopfschneckengehäuse (13) angeordnet sind.Apparatus according to claim 7 or 8, characterized in that the plug screw (1) has a plug screw housing (13) and that the drainage openings (12) in the plug screw housing (13) are arranged. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Entwässerungsöffnungen (12) in dem Bereich des Stopfschneckengehäuses (13) vorgesehen sind, in dem sich im Betrieb ein Faserstoffpfropfen (10) bildet.Apparatus according to claim 9, characterized in that the drainage openings (12) in the region of the plug screw housing (13) are provided, in which forms a Faserstoffpfropfen (10) during operation. Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die Stopfschnecke (12) eine Stopfschneckenhohlwelle (14) zur Abfuhr von Filtrat aufweist und dass die Entwässerungsöffnungen (12') im Hohlwellenmantel (16) angeordnet sind.Device according to one of claims 7 to 10, characterized in that the plug screw (12) has a Stopfschneckenhohlwelle (14) for the removal of filtrate and that the drainage openings (12 ') in the hollow shaft casing (16) are arranged.
EP20090015772 2008-12-29 2009-12-21 Method and device for dehydrating and dispersing a fibrous material Active EP2202052B1 (en)

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AT20182008A AT507837B1 (en) 2008-12-29 2008-12-29 METHOD AND DEVICE FOR DRAINING AND DISPERSING A FIBROUS MATERIAL

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CN101768890A (en) 2010-07-07
EP2202052B1 (en) 2013-09-18

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