WO2010057755A1 - Constant part having decoupling - Google Patents

Constant part having decoupling Download PDF

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Publication number
WO2010057755A1
WO2010057755A1 PCT/EP2009/064340 EP2009064340W WO2010057755A1 WO 2010057755 A1 WO2010057755 A1 WO 2010057755A1 EP 2009064340 W EP2009064340 W EP 2009064340W WO 2010057755 A1 WO2010057755 A1 WO 2010057755A1
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Prior art keywords
consistency
mixing device
low
consistency stream
stream
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PCT/EP2009/064340
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German (de)
French (fr)
Inventor
Karl-Heinz Beuermann
Erwin Binder
Hermann Schmid
Christian Bangert
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Voith Patent Gmbh
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Publication of WO2010057755A1 publication Critical patent/WO2010057755A1/en

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Classifications

    • 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
    • D21D5/02—Straining or screening the pulp
    • 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 an arrangement for producing a finished pulp suspension for producing a paper, cardboard, tissue or other fibrous web from at least one high consistency stream containing fiber and filler and at least one low consistency stream in the constant part of a machine for producing the fibrous web, wherein at least a high-consistency stream and at least one low consistency stream is passed through a respective cleaning device and then before a headbox of the machine in a mixing device.
  • the highly consistent accept is diluted with the white water collected in the paper machine and then fed to the headbox.
  • the accept is usually conducted at higher pressure in the white water.
  • the object of the invention is therefore to improve the stability of the system with the least possible effort.
  • this object is achieved in that, characterized in that at least one of the guided into the mixing device flows between the cleaning device and mixing device, a collecting container for hydraulic decoupling is arranged.
  • the system container is opened via the collecting container so that, in particular, pulsations in the stream are no longer transported. This leads to a substantial improvement in the stability of the process and is especially for high instability streams.
  • the high-consistency stream from a high-consistency collecting tank arranged above the mixing device to the mixing device and / or the low-consistency stream from a low consistency arranged above the mixing device Collection container is passed to the mixing device.
  • the low-consistency stream is usually white water originating in particular from the former of the paper machine, which, however, contains a relatively high proportion of gas.
  • the white water is passed through a degassing device. In this case, a substantial part of the air present in the white water is removed by means of vacuum or via a mechanical separation by utilizing centrifugal forces.
  • the low consistency stream should be at least predominantly, preferably exclusively white water, i. in particular be formed without or at least minimized addition of clear filtrate or fresh water.
  • the consistency of the high consistency stream is before any pre-dilution generally between 1, 2 and 4%, preferably between 2.1 and 3.5%.
  • the consistency of the low consistency stream is generally between 0.1 and 1%, preferably between 0.25 and 0.6%.
  • the pressure of the streams conducted into the mixing device varies in size and in particular the pressure of the mixture fed into the mixing device High consistency stream is higher than that of the low consistency stream.
  • a mixing device described in DE 100 50 109 is particularly suitable. It is essential in this case that the mixing of the streams takes place via an injection of the high-consistency stream, the entry speed of the high-consistency stream preferably being 3 to 15 times the flow velocity of the low-consistency stream.
  • the pressure of the high-consistency stream conducted into the mixing device is higher by 1 bar, preferably by 0.8 bar, than that of the low-consistency stream.
  • the maximum pressure difference is approx. 2.5 bar.
  • a pump should be arranged between the collecting container and the mixing device.
  • a pump can be omitted if between the respective sump and the mixing device, a sufficiently large height difference is present. To create the pressures required at the headbox but also to minimize the pressures of the supplied streams required at the mixing device, it is further advantageous if a headbox pump is present between the mixing device and headbox.
  • the collecting container can be made open at the top.
  • the high-consistency stream 1 in a manner known per se is essentially composed of fibrous materials and fillers corresponding to
  • Venting device 11 in the form of a cyclone or a centrifuge and a cleaning device 10 transported to a high-consistency collection container 3.
  • the resulting white water 15 is collected and returned to the constant part.
  • the use of white water 15 to form a low consistency stream 2 is not only associated with savings over the use of fresh water, but it can also be reused in the white water contained fiber and fillers.
  • the consistency of the white water 15 is about 0.2% here.
  • the collected white water contains 15 impurities and a relatively large amount of air, which is why this is transported by a pump 16 via a degassing device 17 and a cleaning device 14 to a low-consistency collecting container 4.
  • the degassing device 17 may be performed mechanically in the form of a centrifuge or a cyclone or connected to a vacuum source. As a result, the degassing device 17 reduces the content of free air in the white water 15 to less than 1, preferably less than 0.3% by volume.
  • the low-consistency collecting container 4 is designed to be open at the top so that a hydraulic decoupling results via this system opening. With that hydraulic instabilities in the low-consistency stream 2, in particular collected by the previous cleaning device 14.
  • the high consistency stream 1 passes through a pump 21 and from the outlet 8 of the
  • Low-consistency collecting container 4 passes the low-consistency stream 2 via a pump 20 in a mixing device. 5
  • the consistency of the high consistency stream 1 is lowered to about 1, 2%, which is necessary or advantageous for the functioning of the headbox 6 of the paper machine.
  • This premixing can be carried out, for example, via a mixing device 5 described in DE 100 500 109, in which the high-consistency stream 1 is passed into the low-consistency stream 2 at a flow rate of 3 to 15 times the flow rate.
  • a headbox pump 9 finally conveys the pulp suspension of the mixing device 5 to the headbox 6, to which a further low-consistency stream 2 for cross-sectional control is guided.
  • This further low-consistency stream 2 reaches the headbox 6 via a pump 19 and a cleaning device 18 acting as a police filter.
  • the headbox 6 brings the pulp suspension via one or more nozzles on a forming wire of the following former for sheet formation.
  • the already prediluted high-consistency stream 1 is usually combined with the further low-consistency stream 2.
  • the low-consistency stream 2 is fed into a low-consistency current cross-distributor and the high-consistency stream 1 into a high-consistency current cross-distributor.
  • transverse distributor is described, for example, in EP 0029 905, but also in DE 10 234 559.
  • the headbox 6 can, as described in EP 1 645 684 or DE 10 2004 049 261, have a control of the basis weight cross-section.
  • Both reservoir 3.4 are executed here open.
  • the respective collection container 3,4 also works as a degassing device, so that the respectively preceding degassing device 11, 17 can be omitted. About the negative pressure in the suspension or the white water 15 existing air is sucked.
  • the low-consistency stream 2 at the inlet of the mixing device 5 has an approximately absolute pressure between 0.1 and 0.3 bar and the high-consistency stream 1 has a pressure that is about 1 bar higher.
  • the influence of any negative pressure source of the collecting container 3.4 is to be considered.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to an arrangement for producing a finished pulp suspension for manufacturing a paper, cardboard, tissue, or other pulp web from at least one high-consistency flow (1) containing pulp and filler and at least one low-consistency flow (2) in the constant part of a machine for manufacturing the pulp web, wherein at least one high-consistency flow (1) and at least one low-consistency flow (2) are conducted through one cleaning device (10,14) each and then are conducted into a mixing device (5) still before a headbox (6) of the machine. The flow of the pulp suspension to the headbox (6) should be stabilized as result of an accumulating tank (3,4) being arranged between the cleaning device (10,14) and mixing device (5) for the purpose of hydraulic decoupling at least for one of the flows (1,2) fed into the mixing device (5).

Description

Konstantteil mit Entkopplung Constant part with decoupling
Die Erfindung betrifft eine Anordnung zur Erzeugung einer fertigen Faserstoffsuspension zur Herstellung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn aus wenigstens einem, Faser- und Füllstoff enthaltenden Hochkonsistenzstrom sowie zumindest einem Niedrigkonsistenzstrom im Konstantteil einer Maschine zur Herstellung der Faserstoffbahn, wobei wenigstens ein Hochkonsistenzstrom und wenigstens ein Niedrigkonsistenzstrom durch jeweils eine Reinigungsvorrichtung und danach noch vor einem Stoffauflauf der Maschine in eine Mischvorrichtung geführt wird.The invention relates to an arrangement for producing a finished pulp suspension for producing a paper, cardboard, tissue or other fibrous web from at least one high consistency stream containing fiber and filler and at least one low consistency stream in the constant part of a machine for producing the fibrous web, wherein at least a high-consistency stream and at least one low consistency stream is passed through a respective cleaning device and then before a headbox of the machine in a mixing device.
Im konstanten Teil von Papiermaschinen wird der hochkonsistente Gutstoff mit dem in der Papiermaschine aufgefangenen Siebwasser verdünnt und anschließend dem Stoffauflauf zugeführt.In the constant section of paper machines, the highly consistent accept is diluted with the white water collected in the paper machine and then fed to the headbox.
Zur Vermischung wird dabei meist der Gutstoff mit höherem Druck in das Siebwasser geführt.For mixing, the accept is usually conducted at higher pressure in the white water.
Vorher müssen die Ströme jedoch noch gereinigt werden, was hydraulischeBefore that, however, the streams still have to be cleaned, which is hydraulic
Instabilitäten mit sich bringen kann. Diese können dann bis zum Stoffauflauf durchschlagen und die Qualität der herzustellenden Faserstoffbahn beeinträchtigen.Instabilities can bring. These can then penetrate to the headbox and affect the quality of the fibrous web to be produced.
Die Aufgabe der Erfindung ist es daher, die Stabilität des Systems mit möglichst wenig Aufwand zu verbessern.The object of the invention is therefore to improve the stability of the system with the least possible effort.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass, dadurch gekennzeichnet, dass zumindest bei einem der in die Mischvorrichtung geführten Ströme zwischen Reinigungsvorrichtung und Mischvorrichtung ein Sammelbehälter zur hydraulischen Entkopplung angeordnet ist.According to the invention, this object is achieved in that, characterized in that at least one of the guided into the mixing device flows between the cleaning device and mixing device, a collecting container for hydraulic decoupling is arranged.
Über den Sammelbehälter kommt es zur Systemöffnung, so dass insbesondere Pulsationen im Strom nicht weitertransportiert werden. Dies führt zu einer wesentlichen Verbesserung der Stabilität des Prozesses und ist vor allem bei Strömen mit hoher Instabilität einzusetzen.The system container is opened via the collecting container so that, in particular, pulsations in the stream are no longer transported. This leads to a substantial improvement in the stability of the process and is especially for high instability streams.
In Abhängigkeit von den Anforderungen der Mischvorrichtung, der Beschaffenheit der Ströme sowie der speziellen Erfordernisse der Anordnung kann es von Vorteil sein, wenn der Hochkonsistenzstrom aus einem über der Mischvorrichtung angeordneten Hochkonsistenz-Sammelbehälter zur Mischvorrichtung und/oder der Niedrigkonsistenzstrom aus einem über der Mischvorrichtung angeordneten Niedrigkonsistenz-Sammelbehälter zur Mischvorrichtung geleitet wird.Depending on the requirements of the mixing device, the nature of the streams and the specific requirements of the arrangement, it may be advantageous if the high-consistency stream from a high-consistency collecting tank arranged above the mixing device to the mixing device and / or the low-consistency stream from a low consistency arranged above the mixing device Collection container is passed to the mixing device.
Eine umfassende Verbesserung der Stabilität ergibt sich jedoch, wenn der zur Mischvorrichtung geführte Hoch- sowie der Niedrigkonsistenzstrom nach der Reinigungsvorrichtung jeweils in einen Sammelbehälter geleitet werden.However, a complete improvement in stability results when the high and low consistency streams conducted to the mixing device are each directed into a sump after the cleaning device.
Bei dem Niedrigkonsistenzstrom handelt es sich meist um insbesondere aus dem Former der Papiermaschine stammendes Siebwasser, welches allerdings einen relativ hohen Gasanteil enthält. Um den Prozess der Herstellung der Faserstoffbahn sowie deren Qualität nicht zu beeinträchtigen, wird das Siebwasser durch eine Entgasungsvorrichtung geleitet. Dabei wird ein wesentlicher Teil der im Siebwasser vorhandenen Luft mit Hilfe von Vakuum oder über eine mechanische Trennung unter Ausnutzung von Zentrifugalkräften entfernt.The low-consistency stream is usually white water originating in particular from the former of the paper machine, which, however, contains a relatively high proportion of gas. In order not to impair the process of producing the fibrous web and its quality, the white water is passed through a degassing device. In this case, a substantial part of the air present in the white water is removed by means of vacuum or via a mechanical separation by utilizing centrifugal forces.
Zur Reduzierung der Kosten sollte der Niedrigkonsistenzstrom zumindest überwiegend, vorzugsweise ausschließlich von Siebwasser, d.h. insbesondere ohne oder zumindest minimierter Zugabe von Klarfiltrat oder Frischwasser gebildet werden.To reduce costs, the low consistency stream should be at least predominantly, preferably exclusively white water, i. in particular be formed without or at least minimized addition of clear filtrate or fresh water.
Die Stoffdichte des Hochkonsistenzstromes liegt vor einer etwaigen Vorverdünnung im Allgemeinen zwischen 1 ,2 und 4%, vorzugsweise zwischen 2,1 und 3,5 %. Im Gegensatz dazu liegt die Stoffdichte des Niedrigkonsistenzstromes im Allgemeinen zwischen 0,1 und 1 %, vorzugsweise zwischen 0,25 und 0,6 %.The consistency of the high consistency stream is before any pre-dilution generally between 1, 2 and 4%, preferably between 2.1 and 3.5%. In contrast, the consistency of the low consistency stream is generally between 0.1 and 1%, preferably between 0.25 and 0.6%.
Für die Vermischung ist es je nach Ausgestaltung der Mischvorrichtung meist von Vorteil, wenn der Druck der in die Mischvorrichtung geleiteten Ströme verschieden groß und insbesondere der Druck des in die Mischvorrichtung geleiteten Hochkonsistenzstromes höher als der des Niedrigkonsistenzstromes ist. Hierfür eignet sich insbesondere eine in der DE 100 50 109 beschriebene Mischvorrichtung. Wesentlich ist bei dieser, dass die Durchmischung der Ströme über eine Eindüsung des Hochkonsistenzstromes erfolgt, wobei die Eintrittsgeschwindigkeit des Hochkonsistenzstromes vorzugsweise das 3- bis 15fache der Strömungsgeschwindigkeit des Niedrigkonsistenzstromes beträgt.Depending on the design of the mixing device, it is usually advantageous for mixing if the pressure of the streams conducted into the mixing device varies in size and in particular the pressure of the mixture fed into the mixing device High consistency stream is higher than that of the low consistency stream. For this purpose, a mixing device described in DE 100 50 109 is particularly suitable. It is essential in this case that the mixing of the streams takes place via an injection of the high-consistency stream, the entry speed of the high-consistency stream preferably being 3 to 15 times the flow velocity of the low-consistency stream.
In den meisten Fällen genügt es, wenn der Druck des in die Mischvorrichtung geleiteten Hochkonsistenzstromes um 1 bar höher, vorzugsweise um 0,8 bar höher als der des Niedrigkonsistenzstromes ist.In most cases, it is sufficient if the pressure of the high-consistency stream conducted into the mixing device is higher by 1 bar, preferably by 0.8 bar, than that of the low-consistency stream.
Der maximale Druckunterschied liegt bei ca. 2,5 bar.The maximum pressure difference is approx. 2.5 bar.
Für den Aufbau des erforderlichen Drucks sollte zwischen Sammelbehälter und Mischvorrichtung jeweils eine Pumpe angeordnet sein.To build up the required pressure, a pump should be arranged between the collecting container and the mixing device.
Eine Pumpe kann entfallen, wenn zwischen dem jeweiligen Sammelbehälter und der Mischvorrichtung eine ausreichend große Höhendifferenz vorhanden ist. Zur Schaffung der am Stoffauflauf erforderlichen Drücke aber auch zur Minimierung der an der Mischvorrichtung erforderlichen Drücke der zugeführten Ströme ist es des Weiteren von Vorteil, wenn zwischen Mischvorrichtung und Stoffauflauf eine Stoffauflaufpumpe vorhanden ist.A pump can be omitted if between the respective sump and the mixing device, a sufficiently large height difference is present. To create the pressures required at the headbox but also to minimize the pressures of the supplied streams required at the mixing device, it is further advantageous if a headbox pump is present between the mixing device and headbox.
Eine optimale Nutzung der Sammelbehälter ergibt sich, wenn dieser zur Entlüftung der darin befindlichen Suspension bzw. des Siebwassers mit einer Unterdruckquelle verbunden sind.An optimal use of the collection results when it is connected for venting the suspension therein or the white water with a vacuum source.
Falls jedoch eine Entlüftung bereits vor dem Sammelbehälter erfolgt oder nicht erforderlich ist, dann kann der Aufwand für den Sammelbehälter vermindert werden, indem der Luftdruck im Sammelbehälter dem Umgebungsluftdruck entspricht. Im einfachsten Fall kann der Sammelbehälter nach oben offen ausgeführt werden.However, if a vent already takes place before the sump or is not required, then the cost of the sump can be reduced by the air pressure in the sump corresponds to the ambient air pressure. In the simplest case, the collecting container can be made open at the top.
Nachfolgend soll die Erfindung an einem Ausführungsbeispiel näher erläutert werden. - A -The invention will be explained in more detail with reference to an exemplary embodiment. - A -
In der beigefügten Zeichnung zeigt die Figur ein Anlagenschema des Konstantteils einer Papiermaschine.In the accompanying drawing, the figure shows a plant schematic of the constant part of a paper machine.
Im konstanten Teil der Papiermaschine wird der Hochkonsistenzstrom 1 in an sich bekannter Weise im Wesentlichen aus Faser- und Füllstoffen entsprechend denIn the constant part of the paper machine, the high-consistency stream 1 in a manner known per se is essentially composed of fibrous materials and fillers corresponding to
Vorgaben des Papiermachers, d.h. in vorbestimmten Mischungsverhältnissen in einer Stoffbütte 13 zusammengeführt und gemischt.Specifications of the papermaker, i. in predetermined mixing ratios in a Stoffbütte 13 merged and mixed.
Von dieser Stoffbütte 13 wird ein Hochkonsistenzstrom 1 mit einer Stoffdichte von beispielsweise 2,5% mit Hilfe einer Pumpe 12 über eine mechanischeFrom this Stoffbütte 13 is a high-consistency stream 1 with a consistency of for example 2.5% by means of a pump 12 via a mechanical
Entlüftungsvorrichtung 11 in Form eines Zyklons oder einer Zentrifuge und eine Reinigungsvorrichtung 10 zu einem Hochkonsistenz-Sammelbehälter 3 befördert.Venting device 11 in the form of a cyclone or a centrifuge and a cleaning device 10 transported to a high-consistency collection container 3.
Im Former der sich an den Konstantteil anschließenden Papiermaschine sowie nachfolgenden Einheiten wird das anfallende Siebwasser 15 aufgefangen und in den Konstantteil zurückgeführt.In the former of the adjoining the constant part paper machine and subsequent units, the resulting white water 15 is collected and returned to the constant part.
Die Verwendung von Siebwasser 15 zur Bildung eines Niedrigkonsistenzstromes 2 ist nicht nur mit Einsparungen gegenüber dem Einsatz von Frischwasser verbunden, sondern es können auch die im Siebwasser enthaltenen Faser- und Füllstoffe wiederverwendet werden. Die Stoffdichte des Siebwassers 15 liegt hier bei ca. 0,2%.The use of white water 15 to form a low consistency stream 2 is not only associated with savings over the use of fresh water, but it can also be reused in the white water contained fiber and fillers. The consistency of the white water 15 is about 0.2% here.
Allerdings enthält das aufgefangene Siebwasser 15 Verunreinigungen und relativ viel Luft, weshalb dieses von einer Pumpe 16 über eine Entgasungsvorrichtung 17 sowie eine Reinigungsvorrichtung 14 zu einem Niedrigkonsistenz-Sammelbehälters 4 befördert wird.However, the collected white water contains 15 impurities and a relatively large amount of air, which is why this is transported by a pump 16 via a degassing device 17 and a cleaning device 14 to a low-consistency collecting container 4.
Die Entgasungsvorrichtung 17 kann mechanisch in Form einer Zentrifuge oder eines Zyklons ausgeführt oder mit einer Unterdruckquelle verbunden sein. Im Ergebnis reduziert die Entgasungsvorrichtung 17 den Gehalt an freier Luft im Siebwasser 15 auf weniger als 1 , vorzugsweise weniger als 0,3 Vol%.The degassing device 17 may be performed mechanically in the form of a centrifuge or a cyclone or connected to a vacuum source. As a result, the degassing device 17 reduces the content of free air in the white water 15 to less than 1, preferably less than 0.3% by volume.
Der Niedrigkonsistenz-Sammelbehälter 4 ist nach oben offen ausgeführt, so dass sich über diese Systemöffnung eine hydraulische Entkopplung ergibt. Damit werden hydraulische Instabilitäten im Niedrigkonsistenzstrom 2, insbesondere von der vorherigen Reinigungsvorrichtung 14 aufgefangen.The low-consistency collecting container 4 is designed to be open at the top so that a hydraulic decoupling results via this system opening. With that hydraulic instabilities in the low-consistency stream 2, in particular collected by the previous cleaning device 14.
Vom Abfluss 7 des Hochkonsistenz-Sammelbehälters 3 gelangt der Hochkonsistenzstrom 1 über eine Pumpe 21 und vom Abfluss 8 desFrom the outflow 7 of the high-consistency collecting container 3, the high consistency stream 1 passes through a pump 21 and from the outlet 8 of the
Niedrigkonsistenz-Sammelbehälters 4 gelangt der Niedrigkonsistenzstrom 2 über eine Pumpe 20 in eine Mischvorrichtung 5.Low-consistency collecting container 4 passes the low-consistency stream 2 via a pump 20 in a mixing device. 5
In dieser Mischvorrichtung 5 wird die Stoffdichte des Hochkonsistenzstromes 1 auf ca. 1 ,2 % abgesenkt, was für das Funktionieren des Stoffauflaufs 6 der Papiermaschine notwendig oder vorteilhaft ist.In this mixing device 5, the consistency of the high consistency stream 1 is lowered to about 1, 2%, which is necessary or advantageous for the functioning of the headbox 6 of the paper machine.
Diese Vormischung kann beispielsweise über eine in der DE 100 500 109 beschriebene Mischvorrichtung 5 erfolgen, bei der der Hochkonsistenzstrom 1 mit der 3- bis 15fachen Strömungsgeschwindigkeit in den Niedrigkonsistenzstrom 2 geleitet wird.This premixing can be carried out, for example, via a mixing device 5 described in DE 100 500 109, in which the high-consistency stream 1 is passed into the low-consistency stream 2 at a flow rate of 3 to 15 times the flow rate.
Eine Stoffauflaufpumpe 9 befördert die Faserstoffsuspension der Mischvorrichtung 5 schließlich zum Stoffauflauf 6, an den auch ein weiterer Niedrigkonsistenzstrom 2 zur Querprofilregelung geführt wird. Dieser weitere Niedrigkonsistenzstrom 2 gelangt hier über eine Pumpe 19 sowie eine als Polizeifilter fungierende Reinigungsvorrichtung 18 zum Stoffauflauf 6.A headbox pump 9 finally conveys the pulp suspension of the mixing device 5 to the headbox 6, to which a further low-consistency stream 2 for cross-sectional control is guided. This further low-consistency stream 2 reaches the headbox 6 via a pump 19 and a cleaning device 18 acting as a police filter.
Der Stoffauflauf 6 bringt die Faserstoffsuspension über eine oder mehrere Düsen auf ein Formersieb des folgenden Formers zur Blattbildung.The headbox 6 brings the pulp suspension via one or more nozzles on a forming wire of the following former for sheet formation.
Im Stoffauflauf 6 wird der bereits vorverdünnte Hochkonsistenzstrom 1 meist mit dem weiteren Niedrigkonsistenzstrom 2 zusammengeführt. Um dabei gleichmäßige Faserverteilung quer zur Papiermaschine gewährleisten zu können, wird der Niedrigkonsistenzstrom 2 in einen Niedrigkonsistenzstrom-Querverteiler und der Hochkonsistenzstrom 1 in einen Hochkonsistenzstrom-Querverteiler geführt.In the headbox 6, the already prediluted high-consistency stream 1 is usually combined with the further low-consistency stream 2. In order to be able to ensure uniform fiber distribution across the paper machine, the low-consistency stream 2 is fed into a low-consistency current cross-distributor and the high-consistency stream 1 into a high-consistency current cross-distributor.
Beschrieben wird ein derartiger Querverteiler zum Beispiel in der EP 0029 905, aber auch in der DE 10 234 559. Der Stoffauflauf 6 kann dabei, wie in der EP 1 645 684 oder der DE 10 2004 049 261 beschrieben, eine Regelung des Flächengewichtsquerprofils aufweisen.Such a transverse distributor is described, for example, in EP 0029 905, but also in DE 10 234 559. The headbox 6 can, as described in EP 1 645 684 or DE 10 2004 049 261, have a control of the basis weight cross-section.
Beide Sammelbehälter 3,4 sind hier offen ausgeführt.Both reservoir 3.4 are executed here open.
Sie können jedoch ebenso geschlossen realisiert werden, wobei dann eine Unterdruckquelle mit dem Innenraum verbunden sein sollte. Auf diese Weise arbeitet der betreffende Sammelbehälter 3,4 auch als Entgasungsvorrichtung, so dass die jeweils davor liegende Entgasungsvorrichtung 11 ,17 entfallen kann. Über den Unterdruck wird die in der Suspension bzw. dem Siebwasser 15 vorhandene Luft abgesaugt.However, they can also be realized closed, in which case a vacuum source should be connected to the interior. In this way, the respective collection container 3,4 also works as a degassing device, so that the respectively preceding degassing device 11, 17 can be omitted. About the negative pressure in the suspension or the white water 15 existing air is sucked.
Über die Pumpen 20,21 sollte gewährleistet werden, dass der Niedrigkonsistenzstrom 2 am Einlass der Mischvorrichtung 5 etwa einen Absolutdruck zwischen 0,1 und 0,3 bar und der Hochkonsistenzstrom 1 einen um etwa 1 bar höheren Druck hat. Dabei ist insbesondere der Einfluss einer etwaigen Unterdruckquelle des Sammelbehälters 3,4 zu berücksichtigen. It should be ensured via the pumps 20, 21 that the low-consistency stream 2 at the inlet of the mixing device 5 has an approximately absolute pressure between 0.1 and 0.3 bar and the high-consistency stream 1 has a pressure that is about 1 bar higher. In particular, the influence of any negative pressure source of the collecting container 3.4 is to be considered.

Claims

Patentansprüche claims
1. Anordnung zur Erzeugung einer Faserstoffsuspension zur Herstellung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn aus wenigstens einem, Faser- und Füllstoff enthaltenden Hochkonsistenzstrom (1 ) sowie zumindest einem Niedrigkonsistenzstrom (2) im Konstantteil einer Maschine zur Herstellung der Faserstoffbahn, wobei wenigstens ein Hochkonsistenzstrom (1 ) und wenigstens ein Niedrigkonsistenzstrom (2) durch jeweils eine Reinigungsvorrichtung (10,14) und danach noch vor einem Stoffauflauf (6) der Maschine in eine Mischvorrichtung (5) geführt wird, dadurch gekennzeichnet, dass zumindest bei einem der in die Mischvorrichtung (5) geführten Ströme (1 ,2) zwischen Reinigungsvorrichtung (10,14) und Mischvorrichtung (5) ein Sammelbehälter (3,4) anordnet ist.1. Arrangement for producing a pulp suspension for producing a paper, board, tissue or another fibrous web from at least one fiber and filler-containing high-consistency stream (1) and at least one low-consistency stream (2) in the constant part of a machine for producing the fibrous web , wherein at least one high-consistency stream (1) and at least one low-consistency stream (2) are passed through a respective cleaning device (10, 14) and then before a headbox (6) of the machine into a mixing device (5), characterized in that at least at one of the in the mixing device (5) guided streams (1, 2) between the cleaning device (10,14) and mixing device (5) a collecting container (3,4) is arranged.
2. Anordnung nach Anspruch 1 , dadurch gekennzeichnet, dass der zur2. Arrangement according to claim 1, characterized in that the
Mischvorrichtung (5) geführte Hoch- (1 ) sowie der Niedrigkonsistenzstrom (2) nach der Reinigungsvorrichtung (10,14) in einen Sammelbehälter (3,4) geleitet werden.Mixing device (5) guided high (1) and the low-consistency stream (2) after the cleaning device (10,14) in a collecting container (3,4) are passed.
3. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der3. Arrangement according to claim 1 or 2, characterized in that the
Sammelbehälter (3,4) zur Entgasung der zugeführten Flüssigkeit mit einer Unterdruckquelle verbunden ist.Sump (3,4) for degassing the supplied liquid is connected to a vacuum source.
4. Anordnung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Luftdruck im Sammelbehälter (3,4) dem Umgebungsluftdruck entspricht.4. Arrangement according to claim 1 or 2, characterized in that the air pressure in the collecting container (3,4) corresponds to the ambient air pressure.
5. Anordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass zwischen Sammelbehälter (3,4) und Mischvorrichtung (5) eine Pumpe (20,21 ) angeordnet ist. 5. Arrangement according to one of the preceding claims, characterized in that between the collecting container (3,4) and mixing device (5), a pump (20,21) is arranged.
PCT/EP2009/064340 2008-11-21 2009-10-30 Constant part having decoupling WO2010057755A1 (en)

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