EP3004456B1 - Approach system device - Google Patents

Approach system device Download PDF

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Publication number
EP3004456B1
EP3004456B1 EP14724097.2A EP14724097A EP3004456B1 EP 3004456 B1 EP3004456 B1 EP 3004456B1 EP 14724097 A EP14724097 A EP 14724097A EP 3004456 B1 EP3004456 B1 EP 3004456B1
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EP
European Patent Office
Prior art keywords
suspension
dilution
nozzle
mixing
mixing vessel
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EP14724097.2A
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German (de)
French (fr)
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EP3004456A1 (en
Inventor
Axel Erzler
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Voith Patent GmbH
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Voith Patent GmbH
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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
    • D21D5/26—De-aeration of paper stock
    • 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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
    • 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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/08—Regulating consistency
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a device for diluting a, suitable for the production of a paper, board, tissue or another fibrous web pulp suspension with a dilution liquid, which is arranged after a cleaning device for the removal of impurities from the pulp suspension.
  • the highly consistent pulp suspension formed essentially of processed fibers and fillers is diluted with the collected in the paper machine white water and then the headbox
  • the headbox Such a plant is for example from the EP 1 595 998 A1 known.
  • the white water originating in particular from the former of the paper machine contains a relatively high proportion of gas.
  • a degassing is often required.
  • the consistency of the pulp suspension to be cleaned should be as high as possible. Therefore, a re-dilution is often necessary.
  • the redilution takes place via a mixing device that is part of a white water collection container. From there, the pulp suspension must then be conveyed via a pump to the degassing device. This requires a large pumping capacity and conversions are very expensive.
  • the object of the invention is therefore to allow a simple and comprehensive mixing in the dilution.
  • the mixing container can be positioned very close to the cleaning device, resulting in a very compact arrangement.
  • the mixing container can simultaneously serve as a transport space for the diluted pulp suspension to form a following unit. In extreme cases, the mixing space itself is formed by a connecting line.
  • the cleaning device is formed by a plurality of preferably parallel hydrocyclones.
  • Hydrocyclones are well suited to concentrate by centrifugal forces heavy parts and light parts in pulp suspensions and to discharge via the outlet or the separator.
  • the mixing container has an elongated shape and is preferably cylindrical, with one end forming the outlet of the mixing device.
  • the cleaning device is formed by several or even a plurality of hydrocyclones, the purified pulp suspension of each hydrocyclone can be guided over a, preferably separate suspension nozzle in the mixing vessel.
  • the pulp suspension flows in the mixing container in the direction of outlet, it is advantageous for a gradual supply of purified pulp suspension, when the suspension nozzles are arranged side by side in the longitudinal extension of the mixing container.
  • the suspension nozzles and / or the dilution nozzles are arranged at the bottom of the mixing container or at a side surface of the mixing container and towards the center or after aligned above
  • each suspension nozzle is associated with a dilution nozzle.
  • the dilution nozzle associated with a suspension nozzle can follow the outlet or else the dilution nozzle assigned to a suspension nozzle can be arranged such that the jets of both nozzles meet, which provides additional turbulence.
  • the diluted pulp suspension from the outlet of the mixing container is as possible directly guided into a degassing device. Since the pulp suspension can flow through the mixing device, the continuation of the same is hardly affected to the degassing. As a result, no pump between the mixing device and degassing is required.
  • the dilution liquid should at least essentially be formed by white water.
  • the pulp suspension is then advantageously conveyed by a headbox pump to the headbox of the machine.
  • the pulp suspension 1 is injected at high pressure into a white water collecting tank 10 and prediluted by mixing with the white water 3.
  • the prediluted pulp suspension 1 is conveyed by means of suspension pump 7 to a cleaning device, which is formed by a plurality of hydrocyclones 4.
  • a cleaning device which is formed by a plurality of hydrocyclones 4.
  • several parallel hydrocyclones 4 are combined to form a compact cleaner stage.
  • the hydrocyclones 4 described here are used to clean a pulp suspension 1 with a consistency between 2 and 3% of heavy parts. Because of the high consistency, the cleaning device can be made smaller.
  • the fixed housing of the hydrocyclone 4 encloses an elongated chamber with a circular cross-section. At one end of the chamber is an inlet through which the pulp suspension 1 to be cleaned is injected tangentially at a pressure of up to 4 or even 6 bar into a cylindrical inlet section of the chamber. As a result, the pulp suspension 1 is brought to a circular path, wherein the pulp suspension 1 is pressed against the wall of the chamber.
  • dilution liquid is passed into the chamber in the region of the heavy-part separator via a feed line. This allows the trouble-free use of the hydrocyclone 4, even at high fabric densities, as sought here.
  • the existing in the middle of the chamber, purified from the heavy parts pulp suspension 1 is discharged as a lightweight component on the light-part drain.
  • the thus cleaned pulp suspension 1 passes immediately after the cleaning device in a further mixing device 6.
  • This mixing device 6 is essentially formed by a cylindrical mixing container 14, in which via suspension nozzles 11, the purified pulp suspension 1 is introduced.
  • dilution liquid 3 from the white water collecting container 10 is also injected into the mixing container 14 via a plurality of dilution nozzles 12.
  • the white water is conveyed by a dilution pump 8 from the white water collecting container 10 to the further mixing device 6.
  • the purified pulp suspension 1 of the hydrocyclones 4 is injected separately and on the other hand each suspension nozzle 11 is assigned a dilution nozzle 12.
  • each suspension nozzle 11 is assigned a dilution nozzle 12.
  • the degassing device 5 the degassing takes place in a known manner by the connection with a vacuum source 15.
  • the thus degassed pulp suspension 1 is then transported by headbox pump 9 to the headbox of the paper machine.
  • the invention thus also enables a simple retrofitting of existing systems with a re-dilution.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Verdünnung einer, für die Herstellung einer Papier-, Karton-, Tissue- oder einen anderen Faserstoffbahn geeigneten Faserstoffsuspension mit einer Verdünnungsflüssigkeit, welche nach einer Reinigungsvorrichtung zur Entfernung von Störstoffen aus der Faserstoffsuspension angeordnet ist.The invention relates to a device for diluting a, suitable for the production of a paper, board, tissue or another fibrous web pulp suspension with a dilution liquid, which is arranged after a cleaning device for the removal of impurities from the pulp suspension.

Im Konstantteil von Papiermaschinen wird die im Wesentlichen von aufbereiteten Fasern und Füllstoffen gebildete, hochkonsistente Faserstoffsuspension mit dem in der Papiermaschine aufgefangenen Siebwasser verdünnt und anschließend dem Stoffauflauf Eine derartige Anlage ist zum Beispiel aus der EP 1 595 998 A1 bekannt.In the constant part of paper machines, the highly consistent pulp suspension formed essentially of processed fibers and fillers is diluted with the collected in the paper machine white water and then the headbox Such a plant is for example from the EP 1 595 998 A1 known.

Das insbesondere aus dem Former der Papiermaschine stammende Siebwasser enthält einen relativ hohen Gasanteil. Um den Prozess der Herstellung der Faserstoffbahn sowie deren Qualität nicht zu beeinträchtigen, ist daher häufig eine Entgasung erforderlich.
Zur Minimierung des Aufwandes für die Reinigung soll die Stoffdichte der zu reinigenden Faserstoffsuspension möglichst hoch sein. Daher ist oft eine Nachverdünnung nötig. Die Nachverdünnung erfolgt dabei über eine Mischvorrichtung, die Teil eines Siebwassersammelbehälters ist. Von dort muss die Faserstoffsuspension dann über eine Pumpe zur Entgasungsvorrichtung gefördert werden.
Dies erfordert eine große Pumpleistung und Umbauten sind sehr aufwendig.
Die Aufgabe der Erfindung ist es daher eine einfache und umfassende Vermischung bei der Verdünnung zu ermöglichen.The white water originating in particular from the former of the paper machine contains a relatively high proportion of gas. In order not to interfere with the process of manufacturing the fibrous web and its quality, therefore, a degassing is often required.
To minimize the effort for cleaning, the consistency of the pulp suspension to be cleaned should be as high as possible. Therefore, a re-dilution is often necessary. The redilution takes place via a mixing device that is part of a white water collection container. From there, the pulp suspension must then be conveyed via a pump to the degassing device.
This requires a large pumping capacity and conversions are very expensive.
The object of the invention is therefore to allow a simple and comprehensive mixing in the dilution.

Erfindungsgemäß wurde die Aufgabe durch die Merkmale des Anspruchs 1 gelöst.According to the invention the object has been solved by the features of claim 1.

Dies führt vor allem beim Versprühen der Fluide zu einer intensiven Vermischung und bereits zu einer Vorentgasung.
Außerdem kann der Mischbehälter sehr nah zur Reinigungsvorrichtung positioniert werden, was zu einer sehr kompakten Anordnung führt. Des Weiteren kann der Mischbehälter so gleichzeitig als Transportraum der verdünnten Faserstoffsuspension zu einer folgenden Einheit dienen. Im Extremfall wird der Mischraum selbst von einer Verbindungsleitung gebildet.This leads to an intensive mixing and even to a pre-degassing, especially when spraying the fluids.
In addition, the mixing container can be positioned very close to the cleaning device, resulting in a very compact arrangement. In addition, the mixing container can simultaneously serve as a transport space for the diluted pulp suspension to form a following unit. In extreme cases, the mixing space itself is formed by a connecting line.

Im Interesse einer intensiven Reinigung der Faserstoffsuspension und der Behandlung großer Mengen an Faserstoffsuspension ist die Reinigungsvorrichtung von mehreren, vorzugsweise parallel geschalteten Hydrozyklonen gebildet. Hydrozyklone sind gut geeignet, um durch Zentrifugalkräfte Schwerteile und Leichtteile in Faserstoffsuspensionen zu konzentrieren und über den Auslauf bzw. den Abscheider abzuleiten.In the interest of intensive cleaning of the pulp suspension and the treatment of large amounts of pulp suspension, the cleaning device is formed by a plurality of preferably parallel hydrocyclones. Hydrocyclones are well suited to concentrate by centrifugal forces heavy parts and light parts in pulp suspensions and to discharge via the outlet or the separator.

Um eine gute Vermischung der Fluide und die Anordnung von möglichst vielen Suspensions- und/oder Verdünnungs-Düsen zu ermöglichen, ist es von Vorteil, wenn der Mischbehälter eine längliche Form hat und vorzugsweise zylindrisch ausgebildet ist, wobei ein Ende den Auslass der Mischvorrichtung bildet. Insbesondere da die Reinigungsvorrichtung von mehreren oder gar einer Vielzahl von Hydrozyklonen gebildet wird, kann die gereinigte Faserstoffsuspension jedes Hydrozyklons so über eine, vorzugsweise separate Suspensions-Düse in den Mischbehälter geführt werden.In order to allow a good mixing of the fluids and the arrangement of as many suspension and / or dilution nozzles, it is advantageous if the mixing container has an elongated shape and is preferably cylindrical, with one end forming the outlet of the mixing device. In particular, since the cleaning device is formed by several or even a plurality of hydrocyclones, the purified pulp suspension of each hydrocyclone can be guided over a, preferably separate suspension nozzle in the mixing vessel.

Da die Faserstoffsuspension im Mischbehälter in Richtung Auslass strömt, ist es für eine stufenweise Zuführung von gereinigter Faserstoffsuspension vorteilhaft, wenn die Suspensions-Düsen in Längserstreckung des Mischbehälters nebeneinander angeordnet sind.Since the pulp suspension flows in the mixing container in the direction of outlet, it is advantageous for a gradual supply of purified pulp suspension, when the suspension nozzles are arranged side by side in the longitudinal extension of the mixing container.

Damit die eingedüsten Fluide an einer Begrenzungswand des Mischraums abprallen und zusätzlich versprüht werden, was Vermischung und Entgasung zusätzlich fördert, sind die Suspensions-Düsen und/oder die Verdünnungs-Düsen am Boden des Mischbehälters oder an einer Seitenfläche des Mischbehälters angeordnet und zur Mitte oder nach oben ausgerichtetSo that the injected fluids rebound at a boundary wall of the mixing chamber and are additionally sprayed, which additionally promotes mixing and degassing, the suspension nozzles and / or the dilution nozzles are arranged at the bottom of the mixing container or at a side surface of the mixing container and towards the center or after aligned above

Des Weiteren kann die Vermischung der Fluide noch dadurch unterstützt werden, dass möglichst jeder Suspensions-Düse eine Verdünnungs-Düse zugeordnet ist. Auch hierbei ergibt sich eine stufenweise Verdünnung der zum Auslass fließenden Faserstoffsuspension.Furthermore, the mixing of the fluids can still be supported by the fact that as far as possible each suspension nozzle is associated with a dilution nozzle. Here, too, results in a gradual dilution of the pulp suspension flowing to the outlet.

Dabei kann die, einer Suspensions-Düse zugeordnete Verdünnungs-Düse in Richtung Auslass folgen oder aber die einer Suspensions-Düse zugeordnete Verdünnungs-Düse so angeordnet sein, dass sich die Strahlen beider Düsen treffen, was für zusätzliche Verwirbelung sorgt.In this case, the dilution nozzle associated with a suspension nozzle can follow the outlet or else the dilution nozzle assigned to a suspension nozzle can be arranged such that the jets of both nozzles meet, which provides additional turbulence.

Zur Minimierung des Aufwandes sowie des Raumbedarfs wird die verdünnte Faserstoffsuspension vom Auslass des Mischbehälters möglichst unmittelbar in eine Entgasungsvorrichtung geführt.
Da die Faserstoffsuspension die Mischvorrichtung durchströmen kann, wird die Weiterführung derselben zur Entgasungsvorrichtung kaum beeinträchtigt. Infolgedessen ist auch keine Pumpe zwischen Mischvorrichtung und Entgasungsvorrichtung erforderlich.To minimize the effort and space requirements, the diluted pulp suspension from the outlet of the mixing container is as possible directly guided into a degassing device.
Since the pulp suspension can flow through the mixing device, the continuation of the same is hardly affected to the degassing. As a result, no pump between the mixing device and degassing is required.

Die Verdünnungsflüssigkeit sollte zumindest im Wesentlichen von Siebwasser gebildet werden.The dilution liquid should at least essentially be formed by white water.

Nach der Entgasungsvorrichtung wird die Faserstoffsuspension dann mit Vorteil von einer Stoffauflaufpumpe zum Stoffauflauf der Maschine gefördert.After the degassing device, the pulp suspension is then advantageously conveyed by a headbox pump to the headbox of the machine.

Nachfolgend soll die Erfindung an mehreren Ausführungsbeispielen näher erläutert werden.The invention will be explained in more detail below with reference to several exemplary embodiments become.

In der beigefügten Zeichnung zeigt

  • Figur 1: ein Anlagenschema,
  • Figur 2: eine Cleanerstufe mit Verdünnungsdüsen 12,
  • Figur 3: einen Querschnitt durch einen Mischbehälter 14,
  • Figur 4: mehrere Cleanerstufen mit Verdünnungsdüsen 12 und folgender Entgasungsvorrichtung 5 und
  • Figur 5: einen Querschnitt durch einen anderen Mischbehälter 14.
In the attached drawing shows
  • FIG. 1 : a plant scheme,
  • FIG. 2 a cleaner stage with dilution nozzles 12,
  • FIG. 3 a cross-section through a mixing container 14,
  • FIG. 4 several cleaner stages with dilution nozzles 12 and the following degassing device 5 and
  • FIG. 5 a cross-section through another mixing container 14.

Bei dem in Figur 1 gezeigten Konstantteil einer Papiermaschine wird die Faserstoffsuspension 1 mit hohem Druck in einen Siebwasser-Sammelbehälter 10 eingedüst und durch die Vermischung mit dem Siebwasser 3 vorverdünnt. Von dem in Einströmrichtung der Faserstoffsuspension folgenden Auslauf dieser Mischvorrichtung 2 wird die vorverdünnte Faserstoffsuspension 1 mittels Suspensions-Pumpe 7 zu einer Reinigungsvorrichtung gefördert, die von einer Vielzahl von Hydrozyklonen 4 gebildet wird. Wie in Figur 2 und 4 gezeigt, werden dabei mehrere parallel geschaltete Hydrozyklonen 4 zu einer kompakten Cleanerstufe zusammengefasst.At the in FIG. 1 shown constant part of a paper machine, the pulp suspension 1 is injected at high pressure into a white water collecting tank 10 and prediluted by mixing with the white water 3. From the following in the inflow direction of the pulp suspension outlet of this mixing device 2, the prediluted pulp suspension 1 is conveyed by means of suspension pump 7 to a cleaning device, which is formed by a plurality of hydrocyclones 4. As in FIG. 2 and 4 shown, several parallel hydrocyclones 4 are combined to form a compact cleaner stage.

Die hier beschriebenen Hydrozyklone 4 dienen der Reinigung einer Faserstoffsuspension 1 mit einer Stoffdichte zwischen 2 und 3% von Schwerteilen. Wegen der hohen Stoffdichte kann die Reinigungsvorrichtung kleiner ausgeführt werden.The hydrocyclones 4 described here are used to clean a pulp suspension 1 with a consistency between 2 and 3% of heavy parts. Because of the high consistency, the cleaning device can be made smaller.

Das feststehende Gehäuse des Hydrozyklons 4 umschließt eine längliche Kammer mit kreisförmigem Querschnitt.
An einem Ende der Kammer befindet sich ein Einlauf, über den die zu reinigende Faserstoffsuspension 1 tangential mit einem Druck von bis zu 4 oder sogar 6 bar in einen zylindrischen Einlaufabschnitt der Kammer eingedüst wird. Hierdurch wird die Faserstoffsuspension 1 auf eine kreisförmige Bahn gebracht, wobei die Faserstoffsuspension 1 gegen die Wand der Kammer gedrückt wird.The fixed housing of the hydrocyclone 4 encloses an elongated chamber with a circular cross-section.
At one end of the chamber is an inlet through which the pulp suspension 1 to be cleaned is injected tangentially at a pressure of up to 4 or even 6 bar into a cylindrical inlet section of the chamber. As a result, the pulp suspension 1 is brought to a circular path, wherein the pulp suspension 1 is pressed against the wall of the chamber.

Durch die dabei wirkenden Zentrifugal- und Fliehkräfte reichern sich die Schwerteile an der Wand der Kammer und die Leichtteile in der Mitte der Kammer an.
Auf diese Weise gelangen die Schwerteile an der Wand der Kammer spiralförmig zum gegenüberliegenden, hier dem unteren Ende der Kammer mit dem Schwerteil-Abscheider, über den die Schwerteile aus dem Hydrozyklon 4 abgeführt werden.By acting centrifugal and centrifugal forces accumulate the heavy parts on the wall of the chamber and the light parts in the middle of the chamber.
In this way, the heavy parts reach the wall of the chamber spirally to the opposite, here the lower end of the chamber with the heavy part separator, through which the heavy parts are removed from the hydrocyclone 4.

Um Verstopfungen des Schwerteil-Abscheiders entgegenzuwirken, wird im Bereich des Schwerteil-Abscheiders über eine Zuleitung Verdünnungsflüssigkeit in die Kammer geleitet.
Dies erlaubt den störungsfreien Einsatz des Hydrozyklons 4 auch bei hohen Stoffdichten, wie hier angestrebt.To counteract blockages of the heavy-part separator, dilution liquid is passed into the chamber in the region of the heavy-part separator via a feed line.
This allows the trouble-free use of the hydrocyclone 4, even at high fabric densities, as sought here.

Die in der Mitte der Kammer vorhandene, von den Schwerteilen gereinigte Faserstoffsuspension 1 wird als Leichtteil-Komponente über den Leichtteil-Abfluss abgeführt.The existing in the middle of the chamber, purified from the heavy parts pulp suspension 1 is discharged as a lightweight component on the light-part drain.

Die so gereinigte Faserstoffsuspension 1 gelangt unmittelbar nach der Reinigungsvorrichtung in eine weitere Mischvorrichtung 6. Diese Mischvorrichtung 6 wird im Wesentlichen von einem zylindrischen Mischbehälter 14 gebildet, in den über Suspensions-Düsen 11 die gereinigte Faserstoffsuspension 1 eingebracht wird. Zur Verdünnung wird über mehrere Verdünnungs-Düsen 12 außerdem Verdünnungsflüssigkeit 3 aus dem Siebwasser-Sammelbehälter 10 in den Mischbehälter 14 eingedüst. Hierzu wird das Siebwasser von einer Verdünnungs-Pumpe 8 vom Siebwasser-Sammelbehälter 10 zur weiteren Mischvorrichtung 6 gefördert.
Um im Mischbehälter 14 eine umfassende Vermischung zu erreichen, wird einerseits die gereinigte Faserstoffsuspension 1 der Hydrozyklone 4 separat eingedüst und anderseits jeder Suspension-Düse 11 eine Verdünnungs-Düse 12 zugeordnet.
Wie in Figur 3 zu erkennen, können die Suspensions-Düsen 11 und die Verdünnungs-Düsen 12 auf gegenüberliegenden Seitenwänden des Mischbehälters 14 angeordnet werden. Dies führt dazu, dass die Strahlen der Suspensions-Düsen 11 jeweils mit dem Strahl der zugeordneten Verdünnungs-Düse 12 zusammentreffen. Die vom Zusammentreffen ausgehende Verwirbelung führt zu einer intensiven Vermischung.
Demgegenüber befinden sich bei Figur 5 die Suspensions-Düsen 11 und die Verdünnungs-Düsen 12 im Boden des Mischbehälters 14. Die von diesen Düsen 11,12 ausgehenden Strahlen sind dabei nach oben gerichtet, so dass sie an der Innenwand der Mischbehälters 14 abprallen. Hierbei können die Suspensionsdüsen 11 und die jeweils zugeordnete Verdünnungs-Düse 12 bezüglich der Zylinderachse des Mischbehälters 14 hintereinander oder wie hier dargestellt nebeneinander angeordnet werden.The thus cleaned pulp suspension 1 passes immediately after the cleaning device in a further mixing device 6. This mixing device 6 is essentially formed by a cylindrical mixing container 14, in which via suspension nozzles 11, the purified pulp suspension 1 is introduced. For dilution, dilution liquid 3 from the white water collecting container 10 is also injected into the mixing container 14 via a plurality of dilution nozzles 12. For this purpose, the white water is conveyed by a dilution pump 8 from the white water collecting container 10 to the further mixing device 6.
In order to achieve a thorough mixing in the mixing tank 14, on the one hand the purified pulp suspension 1 of the hydrocyclones 4 is injected separately and on the other hand each suspension nozzle 11 is assigned a dilution nozzle 12.
As in FIG. 3 to recognize the suspension nozzles 11 and the Dilution nozzles 12 are arranged on opposite side walls of the mixing container 14. This results in that the jets of the suspension nozzles 11 each coincide with the jet of the associated dilution nozzle 12. The turbulence emanating from the meeting leads to an intensive mixing.
In contrast, are at FIG. 5 the suspension nozzles 11 and the dilution nozzles 12 in the bottom of the mixing container 14. The outgoing of these nozzles 11,12 rays are directed upwards so that they rebound on the inner wall of the mixing container 14. Here, the suspension nozzles 11 and the respective associated dilution nozzle 12 with respect to the cylinder axis of the mixing container 14 in a row or as shown here are arranged side by side.

Da der Strom der Faserstoffsuspension 1 möglichst wenig von der weiteren Mischvorrichtung 6 beeinträchtigt wird, gelangt die Faserstoffsuspension 1 gemäß
Figur 4 ohne zusätzliche Pumpe von der Nachverdünnung über den Auslass 13 des Mischbehälters 14 direkt zu einer Entgasungsvorrichtung 5.Since the flow of the pulp suspension 1 is impaired as little as possible by the further mixing device 6, the pulp suspension 1 passes according to
FIG. 4 without additional pump from the redilution via the outlet 13 of the mixing container 14 directly to a degassing. 5

In der Entgasungsvorrichtung 5 erfolgt die Entgasung in bekannter Weise durch die Verbindung mit einer Unterdruckquelle 15. Die so entgaste Faserstoffsuspension 1 wird dann mittels Stoffauflaufpumpe 9 zum Stoffauflauf der Papiermaschine befördert.In the degassing device 5, the degassing takes place in a known manner by the connection with a vacuum source 15. The thus degassed pulp suspension 1 is then transported by headbox pump 9 to the headbox of the paper machine.

Die Erfindung ermöglicht somit auch eine einfache Nachrüstung bestehender Anlagen mit einer Nachverdünnung.The invention thus also enables a simple retrofitting of existing systems with a re-dilution.

Claims (9)

  1. Device for diluting a fibre-material suspension (1), suitable for the production of a paper, cardboard, tissue, or other fibrous web, using a dilution liquid (3), said device being composed of a purifying device, formed from a plurality of hydrocyclones (4), for removing extraneous materials from the fibre-material suspension (1), of a mixing device (6) having a mixing vessel (14) having an outlet (13), and of a de-gassing device (5), wherein the purified fibre-material suspension (1) of each hydrocyclone (4) is guided by way of a suspension nozzle (11) into the mixing vessel (14) into which the dilution liquid (3) by way of at least one dilution nozzle (12) is also directed, wherein the suspension nozzles (11) and/or the dilution nozzles (12) are disposed on the base of the mixing vessel (14) or on an end face of the mixing vessel (14), and the outlet (13) of the mixing vessel (14), without a pump, leads directly into the de-gassing device (5) that is connected to a negative-pressure source.
  2. Device according to Claim 1, characterized in that the purifying device is formed by a plurality of hydrocyclones (4) that are connected in parallel.
  3. Device according to Claim 1 or 2, characterized in that the mixing vessel (14) has an elongate shape and is preferably configured so as to be cylindrical, wherein one end forms the outlet (13) of the mixing device (6).
  4. Device according to Claim 2 or 3, characterized in that the purified fibre-material suspension (1) of each hydrocyclone (4) is guided into the mixing vessel (14) by way of a separate suspension nozzle (11).
  5. Device according to Claims 3 and 4, characterized in that the suspension nozzles (11) are disposed beside one another in the longitudinal extent of the mixing vessel (10).
  6. Device according to one of the preceding claims, characterized in that each suspension nozzle (11) is preferably assigned one dilution nozzle (12).
  7. Device according to Claim 6, characterized in that the dilution nozzle (12) that is assigned to a suspension nozzle (11) is sequential to the latter in the direction of the outlet (13).
  8. Device according to Claim 6, characterized in that the dilution nozzle (12) that is assigned to a suspension nozzle (11) is disposed such that the jets of both nozzles (11, 12) meet.
  9. Device according to one of the preceding claims, characterized in that the dilution liquid (3) is formed at least substantially by white water.
EP14724097.2A 2013-05-29 2014-05-16 Approach system device Not-in-force EP3004456B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013209998.3A DE102013209998A1 (en) 2013-05-29 2013-05-29 Constant part mixer
PCT/EP2014/060053 WO2014191227A1 (en) 2013-05-29 2014-05-16 Approach system mixing device

Publications (2)

Publication Number Publication Date
EP3004456A1 EP3004456A1 (en) 2016-04-13
EP3004456B1 true EP3004456B1 (en) 2017-02-01

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Application Number Title Priority Date Filing Date
EP14724097.2A Not-in-force EP3004456B1 (en) 2013-05-29 2014-05-16 Approach system device

Country Status (4)

Country Link
EP (1) EP3004456B1 (en)
CN (1) CN105247134B (en)
DE (1) DE102013209998A1 (en)
WO (1) WO2014191227A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020110467A1 (en) * 2020-04-17 2021-10-21 Voith Patent Gmbh Hydrocyclone plant

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4146469A (en) * 1977-10-11 1979-03-27 Clark & Vicario Corporation Mounting of cleaners in papermaking system
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
FI115540B (en) * 2000-12-29 2005-05-31 Metso Paper Inc Apparatus for introducing pulp into a headbox of a paper machine or the like
AT414244B (en) * 2004-05-13 2006-10-15 Andritz Ag Maschf METHOD AND DEVICE FOR THE MIXTURE OF SUBSTANCES
DE102004042341B4 (en) * 2004-09-01 2007-04-12 Voith Patent Gmbh System and method for feeding a pulp suspension to a headbox
DE102008054897A1 (en) * 2008-12-18 2010-07-01 Voith Patent Gmbh Headbox for a machine for producing a fibrous web
DE102010038694A1 (en) * 2010-07-30 2012-02-02 Voith Patent Gmbh constant part

Also Published As

Publication number Publication date
CN105247134A (en) 2016-01-13
EP3004456A1 (en) 2016-04-13
DE102013209998A1 (en) 2014-05-22
CN105247134B (en) 2018-01-12
WO2014191227A1 (en) 2014-12-04

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