EP2598690B1 - Approach system of a machine for producing a fibrous web - Google Patents

Approach system of a machine for producing a fibrous web Download PDF

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Publication number
EP2598690B1
EP2598690B1 EP11724243.8A EP11724243A EP2598690B1 EP 2598690 B1 EP2598690 B1 EP 2598690B1 EP 11724243 A EP11724243 A EP 11724243A EP 2598690 B1 EP2598690 B1 EP 2598690B1
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Prior art keywords
stream
consistency
cleaning
consistency stream
low
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EP11724243.8A
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German (de)
French (fr)
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EP2598690A1 (en
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Günther Kriechbaum
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
    • 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
    • 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
    • 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

Definitions

  • the invention relates to a method for producing a pulp suspension for producing a paper, board, tissue or another fibrous web according to the preamble of claim 1.
  • the invention also relates to an arrangement for producing a pulp suspension for producing a paper, board, tissue or another fibrous web according to the preamble of claim 5.
  • the previously processed high-consistency accept is diluted with the collected in the paper machine white water, cleaned and degassed before it can be fed to the headbox of the paper machine.
  • Fresh water is used to an ever smaller extent usually only in the paper machine used.
  • the object of the invention is therefore to reduce the effort in the constant part with sufficient ventilation. According to the invention, this object is solved by the features of claim 1 and 5, respectively.
  • the high-consistency stream is degassed for the first time and in particular once after a mixing following the purification with a partial flow of the low-consistency stream.
  • the high-consistency stream is passed through a degassing device for the first time and in particular once after a mixing device following the cleaning device.
  • the cleaning devices may consist of several stages. It is also possible that only one or more mixing devices are upstream and / or downstream of the cleaning device.
  • the degassed portion of the headbox total supplied amount of fluid is about 85 to 90%.
  • the air content after degassing of the high-consistency stream is generally below 0.1% and the air content of the white water around 2%, the maximum air content of less than 0.5% generally required for the headbox can be easily met.
  • the cleaning devices such as cleaners or sorters, are often designed for relatively high consistency streams without exploiting their potential. Therefore, the consistency of the high consistency stream immediately before cleaning is between 1.5 and 3.5%, preferably over 2%.
  • degassing does not necessarily have to take place immediately after the cleaning, it is advantageous for degassing the largest possible portion of the pulp suspension if the high-consistency stream is degassed after the last mixing following the cleaning with a partial stream of the low-consistency stream.
  • the consistency of the high-consistency stream immediately before degassing is between 1 and 1.5%.
  • the low-consistency stream is not degassed before mixing with the high-consistency stream or passed through no degassing.
  • headboxes in which, as in the EP1645684 described, mixed to regulate the basis weight cross-profile of the fibrous web to be produced streams of different consistency.
  • an overflow stream with degassed pulp suspension is branched off from the degassing device, which is mixed with it after the high-consistency stream has been cleaned.
  • the high-consistency stream is passed to the last mixing device via a cleaning unit to headbox.
  • This cleaning unit can also act degassing depending on the design.
  • the reject of at least one usually arranged immediately before the headbox cleaning unit of high-consistency or low-consistency stream is passed to another cleaning unit the Accept is preferably performed to degasification.
  • the high-consistency stream 1 is combined in a manner known per se from fibers and fillers in accordance with the specifications of the papermaker, ie in predetermined mixing ratios in a mixing chest and mixed. Thereafter, the high consistency stream 1 has a consistency of 3-4% and an air content in the range of about 3%.
  • the high-consistency stream 1 is subsequently diluted several times, in this case specifically in two mixing devices 3, 4 with a partial stream of the low-consistency stream 2.
  • a cleaning and a one-time degassing of the high-consistency stream 1 before it reaches the headbox 10 of the paper machine From the headbox 10, the finished pulp suspension for sheet formation is placed on or between the former screens of the following former via one or more nozzles.
  • the white water is collected and recycled as a low-consistency stream 2 in the constant part of the machine, so that as little fiber and fillers are lost and little fresh water is needed.
  • the entire white water used for dilution in the mixing devices 3,4 and directly at the headbox 10 is not degassed.
  • this After the first mixing device 3 for dilution of the high-consistency stream 1, this has a consistency of less than 3.5%, which allows the cleaning in a following cleaning device 5 in the form of a centrifugal separator.
  • the relatively high consistency reduces due to the low throughput investment costs for the cleaning device 5, but is not so high that the efficiency of the cleaning device 5 is too much affected.
  • the degassing device 6 includes an overflow, the overflow stream is returned to the immediately preceding mixing device 4 and the high-consistency stream 1 is mixed.
  • this at least partially degassed overflow current is not again performed by the cleaning device 4 contrary to the prior art, which relieves them.
  • the high-consistency stream 1 is passed to the headbox 10 for safety via an additional cleaning unit 7 in the form of a vertical sight with a built-in screen basket (pressure sorter).
  • a partial flow of white water is fed directly to the headbox 10, this is done via a cleaning unit 9 also in the form of a vertical seal with built-in screen basket (pressure sorter).
  • the basis weight cross profile can be influenced at the headbox 10 in a known manner.
  • the reject of the two cleaning units 7, 9 in front of the headbox 10 is recirculated to increase the yield in a further purification unit 8 and its accept in the degassing device 6.
  • the high consistency stream 1 is passed in front of the cleaning device 5, before the degassing device 6 and before the last cleaning unit 7 via a respective fuel pump 11,12,13.
  • the number of required pumps is reduced by at least one.
  • the amount of low-consistency stream 2 (white water) fed via the cleaning unit 9 to the headbox 10 directly via a low-consistency pump 14 usually comprises 10 to 15% of the total quantity of fluid supplied to the headbox 10.
  • the white water usually has an air content of about 2% and the air content of 85% to 90% constituting high consistency stream 1 is less than 0.1%, can easily without degassing of the white water total air content of less than 0.5% Headbox 10 can be ensured.

Description

Die Erfindung betrifft ein Verfahren zur Erzeugung einer Faserstoffsuspension zur Herstellung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for producing a pulp suspension for producing a paper, board, tissue or another fibrous web according to the preamble of claim 1.

Die Erfindung betrifft auch eine Anordnung zur Erzeugung einer Faserstoffsuspension zur Herstellung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn gemäß dem Oberbegriff des Anspruchs 5.The invention also relates to an arrangement for producing a pulp suspension for producing a paper, board, tissue or another fibrous web according to the preamble of claim 5.

Im konstanten Teil von Papiermaschinen wird der vorher aufbereitete hochkonsistente Gutstoff mit dem in der Papiermaschine aufgefangenen Siebwasser verdünnt, gereinigt und entgast, bevor eine Zuführung zum Stoffauflauf der Papiermaschine erfolgen kann.In the constant part of paper machines, the previously processed high-consistency accept is diluted with the collected in the paper machine white water, cleaned and degassed before it can be fed to the headbox of the paper machine.

Hierzu ist es beispielsweise aus der W02004/072365 bekannt, das gesamte Siebwasser vor dessen Beimischung durch eine Entgasungsvorrichtung zu leiten. Es ist des Weiteren bekannt, den Aufwand für die Reinigung des Gutstoffes zu vermindern, indem dieser in zwei Stufen verdünnt wird und die Reinigung bereits nach der ersten Verdünnung erfolgt. Auf diese Weise kann die durch die Reinigungsvorrichtung geführt Fluidmenge wegen der relativ hohen Konsistenz minimiert werden.For this it is for example from the W02004 / 072365 known to direct the entire white water before its admixture through a degassing. It is also known, the cost of cleaning the accept Dilute it by diluting it in two stages and cleaning it after the first dilution. In this way, the amount of fluid passed through the cleaning device can be minimized because of the relatively high consistency.

Falls das Siebwasser nicht bereits vor der Zumischung entgast wurde, so erfolgt im Fall der zweistufigen Verdünnung sowohl eine Entgasung des gereinigten Hochkonsistenzstromes nach der ersten Verdünnung, als auch eine Entgasung des Niedrigkonsistenzstromes für die zweite Verdünnung.If the white water has not already been degassed before admixing, in the case of the two-stage dilution both degassing of the purified high-consistency stream after the first dilution and degassing of the low-consistency stream for the second dilution are carried out.

Frischwasser kommt dabei in immer geringer werdendem Umfang meist nur noch im Bereich der Papiermaschine zum Einsatz.Fresh water is used to an ever smaller extent usually only in the paper machine used.

Bei beiden Ausführungen ist der Aufwand insbesondere für die Entgasung relativ hoch.In both versions, the effort is relatively high, especially for the degassing.

Die Aufgabe der Erfindung ist es daher den Aufwand im Konstantteil bei ausreichender Entlüftung zu vermindern. Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 bzw. 5 gelöst.The object of the invention is therefore to reduce the effort in the constant part with sufficient ventilation. According to the invention, this object is solved by the features of claim 1 and 5, respectively.

Erfindungsgemäß wird der Hochkonsistenzstrom erstmalig und insbesondere einmalig nach einer, der Reinigung folgendenden Vermischung mit einem Teilstrom des Niedrigkonsistenzstromes entgast.According to the invention, the high-consistency stream is degassed for the first time and in particular once after a mixing following the purification with a partial flow of the low-consistency stream.

Auf diese Weise entfällt die Entgasung des Niedrigkonsistenzstromes vor der Beimischung. Auch die Belastung der Reinigungsvorrichtung sowie der Entgasungsvorrichtung bleiben wegen der hohen Stoffdichte nach der ersten Verdünnung relativ gering.In this way, the degassing of the low-consistency stream prior to admixture is eliminated. The load of the cleaning device and the degassing remain relatively low because of the high consistency after the first dilution.

Hinsichtlich der Anordnung ist dementsprechend wesentlich, dass der Hochkonsistenzstrom erstmalig und insbesondere einmalig nach einer, der Reinigungsvorrichtung folgendenden Mischvorrichtung durch eine Entgasungsvorrichtung geführt wird.With regard to the arrangement, it is accordingly essential that the high-consistency stream is passed through a degassing device for the first time and in particular once after a mixing device following the cleaning device.

Dabei kann die Reinigungsvorrichtungen aus mehreren Stufen bestehen. Es ebenso möglich, dass der Reinigungsvorrichtung nur eine oder mehrere Mischvorrichtungen vor und/oder nachgelagert sind.The cleaning devices may consist of several stages. It is also possible that only one or more mixing devices are upstream and / or downstream of the cleaning device.

Hierbei wird bewusst auf eine Entgasung des nach der Entgasung des Hochkonsistenzstromes zugeführten Teilstroms des Niedrigkonsistenzstromes verzichtet. Dies ist hinnehmbar, da der überwiegende Teil der dem Stoffauflauf zugeführten Fluidmenge entgast wird. Selbst bei einem Stoffauflauf mit direkt zugeführtem Verdünnungswasser liegt der entgaste Anteil an der dem Stoffauflauf insgesamt zugeführten Fluidmenge bei etwa 85 bis 90%.
Da der Luftgehalt nach der Entgasung des Hochkonsistenzstromes in der Regel unter 0,1% und der Luftgehalt des Siebwassers bei rund 2% liegen, kann so der im Allgemeinen beim Stoffauflauf geforderte maximale Luftgehalt von weniger als 0,5% problemlos eingehalten werden.In this case, it is deliberately dispensed with a degassing of the supplied after degassing of the high-consistency stream partial flow of the low-consistency stream. This is acceptable, since the vast majority of the headbox supplied amount of fluid is degassed. Even with a headbox with directly supplied dilution water, the degassed portion of the headbox total supplied amount of fluid is about 85 to 90%.
As the air content after degassing of the high-consistency stream is generally below 0.1% and the air content of the white water around 2%, the maximum air content of less than 0.5% generally required for the headbox can be easily met.

Im Ergebnis kann so auf eine zweite Entgasungsvorrichtung verzichtet werden.
Die Reinigungsvorrichtungen, wie Cleaner oder Sortierer sind oft für Ströme mit relativ hoher Konsistenz ausgelegt, ohne dass dessen Potential genutzt wird. Daher liegt die Stoffdichte des Hochkonsistenzstromes unmittelbar vor der Reinigung zwischen 1,5 und 3,5%, vorzugsweise über 2%.As a result, it is possible to dispense with a second degassing device.
The cleaning devices, such as cleaners or sorters, are often designed for relatively high consistency streams without exploiting their potential. Therefore, the consistency of the high consistency stream immediately before cleaning is between 1.5 and 3.5%, preferably over 2%.

Bei den Mischvorrichtungen ist es im Interesse einer guten Durchmischung vorteilhaft, wenn eine Eindüsung des Hochkonsistenzstromes in den Niedrigkonsistenzstrom erfolgt, wobei die Eintrittsgeschwindigkeit des Hochkonsistenzstromes 3 bis 15 mal größer sein sollte als die Strömungsgeschwindigkeit des Niedrigkonsistenzstromes.In the mixing devices, it is advantageous in the interest of a good mixing, if an injection of the high-consistency stream into the low-consistency stream, wherein the entry velocity of the high-consistency stream should be 3 to 15 times greater than the flow rate of the low-consistency stream.

Da die Entgasung nicht unbedingt unmittelbar nach der Reinigung erfolgen muss, ist es zur Entgasung eines möglichst großen Anteils der Faserstoffsuspension von Vorteil, wenn der Hochkonsistenzstrom nach der letzten, der Reinigung folgenden Vermischung mit einem Teilstrom des Niedrigkonsistenzstromes entgast wird.Since degassing does not necessarily have to take place immediately after the cleaning, it is advantageous for degassing the largest possible portion of the pulp suspension if the high-consistency stream is degassed after the last mixing following the cleaning with a partial stream of the low-consistency stream.

Dies bedeutet für die Anordnung, dass der Hochkonsistenzstrom nach der letzten, der Reinigungsvorrichtung folgenden Mischvorrichtung durch eine Entgasungsvorrichtung geführt wird.This means for the arrangement that the high-consistency stream is passed through a degassing device after the last mixing device following the cleaning device.

Zur Gewährleistung einer hohen Effizienz der Entgasung liegt die Stoffdichte des Hochkonsistenzstromes unmittelbar vor der Entgasung zwischen 1 und 1,5%.To ensure a high degassing efficiency, the consistency of the high-consistency stream immediately before degassing is between 1 and 1.5%.

Um den Aufwand für die Entgasung minimal zu halten, wird der Niedrigkonsistenzstrom vor der Vermischung mit dem Hochkonsistenzstrom nicht entgast bzw. durch keine Entgasungsvorrichtung geführt.In order to keep the effort for the degassing minimal, the low-consistency stream is not degassed before mixing with the high-consistency stream or passed through no degassing.

Dies gilt auch für Stoffaufläufe bei denen, wie in der EP1645684 beschrieben, zur Regelung des Flächengewichtsquerprofils der herzustellenden Faserstoffbahn Ströme unterschiedlicher Konsistenz vermischt werden.
Dabei wird ein Teilstrom des Niedrigkonsistenzstromes ohne Entgasung aber vorzugsweise über eine Reinigungseinheit zum Stoffauflauf der Maschine geführt.This also applies to headboxes in which, as in the EP1645684 described, mixed to regulate the basis weight cross-profile of the fibrous web to be produced streams of different consistency.
In this case, a partial flow of the low-consistency stream without degassing but preferably via a cleaning unit to the headbox of the machine.

Wegen der Schwankungen beim zu- und abgeführten Fluid wird aus der Entgasungsvorrichtung ein Überlaufstrom mit entgaster Faserstoffsuspension abgezweigt, welcher erst nach der Reinigung des Hochkonsistenzstromes diesem beigemischt wird. Bezüglich der Anordnung bedeutet dies, dass der Überlaufstrom der Entgasungsvorrichtung zu einer der Reinigungsvorrichtung des Hochkonsistenzstromes folgenden Mischvorrichtung geleitet wird. Dies entlastet die Reinigungsvorrichtung zusätzlich.Because of the fluctuations in the incoming and outgoing fluid, an overflow stream with degassed pulp suspension is branched off from the degassing device, which is mixed with it after the high-consistency stream has been cleaned. With regard to the arrangement, this means that the overflow stream of the degassing device is passed to a mixing device following the cleaning device of the high-consistency stream. This additionally relieves the cleaning device.

Um Störungen beim Stoffauflauf und damit bei der Herstellung der Faserstoffbahn zu vermeiden, wird der Hochkonsistenzstrom nach der letzten Mischvorrichtung über eine Reinigungseinheit zum Stoffauflauf geführt. Dabei kann diese Reinigungseinheit je nach Ausführung auch entgasend wirken.To avoid disturbances in the headbox and thus in the production of the fibrous web, the high-consistency stream is passed to the last mixing device via a cleaning unit to headbox. This cleaning unit can also act degassing depending on the design.

Zur möglichst umfassenden Nutzung der Faser- und Füllstoffe ist es vorteilhaft, wenn das Reject wenigstens einer meist unmittelbar vor dem Stoffauflauf angeordneten Reinigungseinheit des Hochkonsistenz- oder des Niedrigkonsistenzstromes zu einer weiteren Reinigungseinheit geleitet wird, dessen Accept vorzugsweise zur Entgasungsvorrichtung geführt wird.For the widest possible use of the fibers and fillers, it is advantageous if the reject of at least one usually arranged immediately before the headbox cleaning unit of high-consistency or low-consistency stream is passed to another cleaning unit, the Accept is preferably performed to degasification.

Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur eine schematische Darstellung des Konstantteils einer Papiermaschine.The invention will be explained in more detail with reference to an exemplary embodiment. In the accompanying drawing, the figure shows a schematic representation of the constant part of a paper machine.

Im konstanten Teil der Papiermaschine wird der Hochkonsistenzstrom 1 in an sich bekannter Weise aus Faser- und Füllstoffen entsprechend den Vorgaben des Papiermachers, d.h. in vorbestimmten Mischungsverhältnissen in einer Mischbütte zusammengeführt und gemischt.
Danach hat der Hochkonsistenzstrom 1 eine Stoffdichte von 3 - 4% und einen Luftgehalt im Bereich von ungefähr 3%.In the constant part of the paper machine, the high-consistency stream 1 is combined in a manner known per se from fibers and fillers in accordance with the specifications of the papermaker, ie in predetermined mixing ratios in a mixing chest and mixed.
Thereafter, the high consistency stream 1 has a consistency of 3-4% and an air content in the range of about 3%.

Im Konstantteil wird der Hochkonsistenzstrom 1 anschließend mehrfach, hier konkret in zwei Mischvorrichtungen 3,4 mit einem Teilstrom des Niedrigkonsistenzstromes 2 verdünnt. Außerdem erfolgt eine Reinigung sowie eine einmalige Entgasung des Hochkonsistenzstromes 1 bevor dieser zum Stoffauflauf 10 der Papiermaschine gelangt.
Vom Stoffauflauf 10 wird die fertige Faserstoffsuspension zur Blattbildung über eine oder mehrere Düsen auf oder zwischen die Formersiebe des folgenden Formers gebracht.
Im Former sowie nachfolgenden Einheiten der Maschine wird das Siebwasser aufgefangen und als Niedrigkonsistenzstrom 2 in den Konstantteil der Maschine zurückgeführt, so dass möglichst wenig Faser- und Füllstoffe verloren gehen und wenig Frischwasser benötigt wird.In the constant part, the high-consistency stream 1 is subsequently diluted several times, in this case specifically in two mixing devices 3, 4 with a partial stream of the low-consistency stream 2. In addition, a cleaning and a one-time degassing of the high-consistency stream 1 before it reaches the headbox 10 of the paper machine.
From the headbox 10, the finished pulp suspension for sheet formation is placed on or between the former screens of the following former via one or more nozzles.
In the former and subsequent units of the machine, the white water is collected and recycled as a low-consistency stream 2 in the constant part of the machine, so that as little fiber and fillers are lost and little fresh water is needed.

Zur Minimierung des Aufwandes wird das gesamte zur Verdünnung in den Mischvorrichtungen 3,4 sowie direkt beim Stoffauflauf 10 eingesetzte Siebwasser nicht entgast.To minimize the effort, the entire white water used for dilution in the mixing devices 3,4 and directly at the headbox 10 is not degassed.

Nach der ersten Mischvorrichtung 3 zur Verdünnung des Hochkonsistenzstromes 1 hat dieser eine Stoffdichte von weniger als 3,5%, was die Reinigung in einer folgenden Reinigungsvorrichtung 5 in Form eines Zentrifugal-Abscheiders erlaubt. Die relativ hohe Stoffdichte vermindert wegen des geringen Durchsatzes die Investitionskosten für die Reinigungsvorrichtung 5, ist aber nicht so hoch, daß der Wirkungsgrad der Reinigungsvorrichtung 5 zu stark beeinträchtigt wird.After the first mixing device 3 for dilution of the high-consistency stream 1, this has a consistency of less than 3.5%, which allows the cleaning in a following cleaning device 5 in the form of a centrifugal separator. The relatively high consistency reduces due to the low throughput investment costs for the cleaning device 5, but is not so high that the efficiency of the cleaning device 5 is too much affected.

Im Anschluss an die Reinigung erfolgt eine weitere Verdünnung des Hochkonsistenzstromes 1 in einer folgenden Mischvorrichtung 4, was die Stoffdichte auf 1 bis 1,5 % verringert.Subsequent to the purification, a further dilution of the high-consistency stream 1 takes place in a following mixing device 4, which reduces the consistency to 1 to 1.5%.

Erst danach wird der Hochkonsistenzstrom 1 zu einer Entgasungsvorrichtung 6 geführt, in der das Fluid unter Unterdruck bis an die Siedelinie gebracht und so entgast wird.Only then is the high-consistency stream 1 fed to a degassing device 6 in which the fluid is brought under reduced pressure to the boiling point and thus degassed.

Zum Ausgleich von Durchsatz-Schwankungen enthält die Entgasungsvorrichtung 6 einen Überlauf, dessen Überlaufstrom zur unmittelbar vorangegangenen Mischvorrichtung 4 zurückgeführt und dem Hochkonsistenzstrom 1 zugemischt wird. Somit wird dieser zumindest teilweise entgaste Überlaufstrom entgegen dem bisherigen Stand der Technik nicht noch einmal durch die Reinigungsvorrichtung 4 geführt, was diese entlastet.To compensate for throughput fluctuations, the degassing device 6 includes an overflow, the overflow stream is returned to the immediately preceding mixing device 4 and the high-consistency stream 1 is mixed. Thus, this at least partially degassed overflow current is not again performed by the cleaning device 4 contrary to the prior art, which relieves them.

Nach der Entgasungsvorrichtung 6 wird der Hochkonsistenzstrom 1 zur Sicherheit über eine zusätzliche Reinigungseinheit 7 in Form eines Vertikalsichters mit eingebautem Siebkorb (Drucksortierer) zum Stoffauflauf 10 geleitet.After the degassing device 6, the high-consistency stream 1 is passed to the headbox 10 for safety via an additional cleaning unit 7 in the form of a vertical sight with a built-in screen basket (pressure sorter).

Falls, wie in der Figur angedeutet, ein Teilstrom des Siebwassers direkt zum Stoffauflauf 10 geführt wird, so erfolgt dies über eine Reinigungseinheit 9 ebenfalls in Form einesVertikalsichters mit eingebautem Siebkorb (Drucksortierer).If, as indicated in the figure, a partial flow of white water is fed directly to the headbox 10, this is done via a cleaning unit 9 also in the form of a vertical seal with built-in screen basket (pressure sorter).

Mit Hilfe des Siebwassers kann so das Flächengewichtsquerprofil am Stoffauflauf 10 in bekannter Weise beeinflusst werden.With the help of the white water so the basis weight cross profile can be influenced at the headbox 10 in a known manner.

Das Reject der beiden Reinigungseinheiten 7,9 vor dem Stoffauflauf 10 wird zur Erhöhung der Ausbeute in eine weitere Reinigungseinheit 8 und deren Accept in die Entgasungsvorrichtung 6 zurückgeführt.The reject of the two cleaning units 7, 9 in front of the headbox 10 is recirculated to increase the yield in a further purification unit 8 and its accept in the degassing device 6.

Zur Schaffung der erforderlichen Drücke wird der Hochkonsistenzstrom 1 vor der Reinigungsvorrichtung 5, vor der Entgasungsvorrichtung 6 und vor der letzten Reinigungseinheit 7 über jeweils eine Stoffpumpe 11,12,13 geleitet.To create the required pressures, the high consistency stream 1 is passed in front of the cleaning device 5, before the degassing device 6 and before the last cleaning unit 7 via a respective fuel pump 11,12,13.

Durch den Einsatz nur einer Entgasungsvorrichtung 6 verringert sich so die Anzahl erforderlicher Pumpen um zumindest eine.By using only one degassing device 6, the number of required pumps is reduced by at least one.

Die über die Reinigungseinheit 9 dem Stoffauflauf 10 direkt über eine Niedrigkonsistenzpumpe 14 zugeführte Menge an Niedrigkonsistenzstrom 2 (Siebwasser) umfasst üblicherweise 10 bis 15% der dem Stoffauflauf 10 insgesamt zugeführten Fluidmenge.The amount of low-consistency stream 2 (white water) fed via the cleaning unit 9 to the headbox 10 directly via a low-consistency pump 14 usually comprises 10 to 15% of the total quantity of fluid supplied to the headbox 10.

Da das Siebwasser in der Regel etwa einen Luftgehalt von 2% aufweist und der Luftgehalt des 85 bis 90% ausmachenden Hochkonsistenzstromes 1 kleiner als 0,1 % ist, kann problemlos auch ohne Entgasung des Siebwassers insgesamt ein Luftgehalt von weniger als 0,5% beim Stoffauflauf 10 gewährleistet werden.Since the white water usually has an air content of about 2% and the air content of 85% to 90% constituting high consistency stream 1 is less than 0.1%, can easily without degassing of the white water total air content of less than 0.5% Headbox 10 can be ensured.

Des Weiteren erfolgt eine effiziente Nutzung der Reinigungsvorrichtung 5, da diese mit einem relativ hohen Stoffgehalt passiert und der Überlaufstrom der Entgasungsvorrichtung 6 erst nach der Reinigungsvorrichtung 5 zum Hochkonsistenzstrom 1 zugemischt wird.Furthermore, there is an efficient use of the cleaning device 5, since this happens with a relatively high substance content and the overflow stream of the degassing device 6 is added to the high-consistency stream 1 only after the cleaning device 5.

Claims (9)

  1. Method for producing a fibrous stock suspension for producing a paper, cardboard, tissue or another fibrous web by mixing at least one high-consistency stream (1) which is formed from prepared fibrous material and filler with at least one low-consistency stream (2) which is preferably formed from fresh water or white water in a machine for producing the fibrous web, the high-consistency stream (1) being cleaned and being mixed before and after said cleaning with at least one part stream of the low-consistency stream (2), the high-consistency stream (1) being de-gassed for the first time after mixing with a part stream of the low-consistency stream (2), which mixing follows the cleaning, characterized in that the consistency of the high-consistency stream (1) lies between 1.5 and 3.5% immediately before the cleaning and between 1 and 1.5% immediately before the de-gassing, an overflow stream which accumulates during the de-gassing is admixed to the high-consistency stream (1) only after the cleaning of the said high-consistency stream (1) and the low-consistency stream (2) is not de-gassed before the mixing with the high-consistency stream (1).
  2. Method according to Claim 1, characterized in that the high-consistency stream (1) is de-gassed after the last mixing with a part stream of the low-consistency stream (2), which mixing follows the cleaning.
  3. Method according to Claim 1 or 2, characterized in that a part stream of the low-consistency stream (2) for regulating the cross-machine grammage profile of the fibrous web to be produced is guided to the headbox (10) of the machine.
  4. Method according to one of the preceding claims, characterized in that the consistency of the high-consistency stream (1) lies above 2% immediately before the cleaning.
  5. Arrangement for producing a fibrous stock suspension for producing a paper, cardboard, tissue or another fibrous web from at least one high-consistency stream (1) which is formed from prepared fibrous material and filler and at least one low-consistency stream (2) which is preferably formed from fresh water or white water in the approach system of a machine for producing the fibrous web, the high-consistency stream (1) being guided through at least one cleaning apparatus (5) and, before and after the said cleaning apparatus (5), being diluted with a part stream of the low-consistency stream (2) in at least in each case one mixing apparatus (3, 4), in particular for carrying out the method according to one of the preceding claims, the high-consistency stream (1) being guided through a de-gassing apparatus (6) for the first time after a mixing apparatus (4) which follows the cleaning apparatus (5), and the high-consistency stream (1) being guided after the last mixing apparatus (4) via a cleaning unit (7) to the headbox (10), characterized in that an overflow stream of the de-gassing apparatus (6) is guided to a mixing apparatus (4) which follows the cleaning apparatus (5) of the high-consistency stream (1).
  6. Arrangement according to Claim 5, characterized in that the high-consistency stream (1) is guided through a de-gassing apparatus (6) after the last mixing apparatus (4) which follows the cleaning apparatus (5).
  7. Arrangement according to Claim 5 or 6, characterized in that the low-consistency stream (2) is not guided through a de-gassing apparatus before the mixing apparatus (3, 4).
  8. Arrangement according to one of Claims 5 to 7, characterized in that a part stream of the low-consistency stream (2) for regulating the cross-machine grammage profile of the fibrous web to be produced is preferably guided via a cleaning unit (9) to the headbox (10) of the machine.
  9. Arrangement according to one of Claims 5 to 8, characterized in that the reject stream of at least one cleaning unit (7, 9) is guided to a further cleaning unit (8), the accept stream of which is preferably guided to the de-gassing apparatus (6).
EP11724243.8A 2010-07-30 2011-06-10 Approach system of a machine for producing a fibrous web Not-in-force EP2598690B1 (en)

Applications Claiming Priority (2)

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DE201010038694 DE102010038694A1 (en) 2010-07-30 2010-07-30 constant part
PCT/EP2011/059668 WO2012013407A1 (en) 2010-07-30 2011-06-10 Approach system of a machine for producing a fibrous web

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EP2598690A1 EP2598690A1 (en) 2013-06-05
EP2598690B1 true EP2598690B1 (en) 2014-04-23

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EP (1) EP2598690B1 (en)
CN (1) CN103154362B (en)
DE (1) DE102010038694A1 (en)
WO (1) WO2012013407A1 (en)

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DE102013206638A1 (en) * 2013-04-15 2014-10-30 Voith Patent Gmbh Pressure sorter reject treatment
DE102013210004A1 (en) * 2013-05-29 2014-05-15 Voith Patent Gmbh constant part
DE102013209998A1 (en) * 2013-05-29 2014-05-22 Voith Patent Gmbh Constant part mixer
CN107447567A (en) * 2017-09-30 2017-12-08 枣庄市恒宇纸业有限公司 A kind of processing unit of papermaking equipment slurry

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FI93314C (en) * 1991-10-16 1995-03-27 Ahlstroem Oy The gas separation tank
FI103676B1 (en) * 1998-06-10 1999-08-13 Valmet Corp Process arrangement for the short circulation in a paper or tub machine
EP1218587B1 (en) * 1999-09-21 2006-06-21 Metso Paper, Inc. Regulation system for the short circulation and headbox of a paper machine or equivalent
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
FI115539B (en) * 2001-02-23 2005-05-31 Metso Automation Oy Method and apparatus for controlling in a paper machine or the corresponding short circulation
FI111391B (en) * 2001-04-23 2003-07-15 Metso Paper Inc Process and process arrangement in the short circulation of a paper machine
FI111467B (en) * 2001-09-07 2003-07-31 Metso Paper Inc Ventilation arrangement in connection with a paper machine or the like
FI113971B (en) 2003-02-11 2004-07-15 Metso Paper Inc Stock treatment apparatus for treatment of stock passed to headbox of paper machine, comprises accept line of hydrocyclone plant and connected with stock line of stock fed from second stock chest
FI119111B (en) * 2004-03-15 2008-07-31 Metso Paper Inc A method for monitoring and controlling the papermaking process
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DE102007038089A1 (en) * 2007-08-11 2009-02-12 Voith Patent Gmbh constant part
DE102007038090A1 (en) * 2007-08-11 2009-02-12 Voith Patent Gmbh Constant part IV
DE102008061970A1 (en) * 2008-12-12 2010-06-17 Voith Patent Gmbh Approach flow sorting

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Publication number Publication date
CN103154362A (en) 2013-06-12
CN103154362B (en) 2015-10-21
EP2598690A1 (en) 2013-06-05
DE102010038694A1 (en) 2012-02-02
WO2012013407A1 (en) 2012-02-02

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