EP1884591A1 - Method for feeding a fibrous material suspension into a headbox - Google Patents

Method for feeding a fibrous material suspension into a headbox Download PDF

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Publication number
EP1884591A1
EP1884591A1 EP07013179A EP07013179A EP1884591A1 EP 1884591 A1 EP1884591 A1 EP 1884591A1 EP 07013179 A EP07013179 A EP 07013179A EP 07013179 A EP07013179 A EP 07013179A EP 1884591 A1 EP1884591 A1 EP 1884591A1
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EP
European Patent Office
Prior art keywords
headbox
pulp suspension
paper
operated
pressure
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP07013179A
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German (de)
French (fr)
Inventor
Erwin Binder
Axel Gommel
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1884591A1 publication Critical patent/EP1884591A1/en
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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
    • 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
    • D21D5/22—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in apparatus with a vertical axis
    • 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
    • D21F1/06—Regulating pulp flow
    • D21F1/065—Shock-absorbing devices

Definitions

  • the invention relates to a method for feeding a pulp suspension according to the preamble of claim 1.
  • the pulp suspension to be supplied receives most of the fibers from a thick stock suspension provided in the stock preparation plant.
  • the latter has e.g. a typical consistency, i. a dry content between 2.5 and 5%.
  • dilution liquid e.g. White water of the paper machine
  • the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine. This can e.g. 1 to 2%.
  • the fibrous suspension so formed, after most or all of the ingredients are contained in the correct amount, is conveyed via the headbox pump to the head box of a paper or board machine. Between this headbox pump and the headbox is a closed system, which is under pressure, so that the pulp suspension can get to the or the screens of the paper machine.
  • Modern headboxes have a considerable pressure drop because of their hydraulic functions, which is why the inlet space of the headbox is under high pressure. This required pressure drop further increases when the paper or board machine is a so-called high-speed machine, ie, for example, produced at speeds above 1500 m / min. Because of this high pressure and the aforementioned pressure sorter must be designed for such pressures, which is possible, but has led to considerable effort.
  • a corresponding system example shows the DE 100 50 109 A1 ,
  • the invention is based on the object to provide a method of the type mentioned above, with which the pressure load of the directly before the headbox Drucksortierers can be reduced.
  • the invention makes it possible to combine the requirement for optimum safety with the possibility of further increasing the pressures in the headbox in order to be able to drive higher paper machine speeds. But even with not increased paper machine speed, the invention may be advantageous because the demands on the pressure sorters, such as strength of the housing, the seals and the sorting baskets are lower, which in turn has economic advantages.
  • FIG. 1 shows an example for carrying out the method according to the invention.
  • a pulp suspension S is produced in the usual manner by mixing a thick stock suspension 4 with a diluting liquid 5 and then has in Essentially the desired consistency for the operation of the headbox 1 of the paper or board machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%.
  • the dilution liquid 5, which is supplied at a mixing point 8 originates in the example shown here from the first white water 12, that is, the water incurred in the forming area of the paper or board machine 2. It is often referred to as "white water I" (SWI), unlike the later on the paper machine resulting second white water 16 (SWII), which contains much less fines.
  • SWI white water I
  • the white water is collected below the paper machine sieve and discharged laterally. In the open channels used for this purpose, a large part of the air contained can already escape. Nevertheless, it often makes sense to eliminate a further gas portion 7 in a special container 11, as he eg from the DE 199 38 799 is known. To assist the container 11 may be under a moderate negative pressure.
  • a degassing device 6 is used here. This is constructed as a cylindrical or conical container and provided according to the invention with a rotor 13.
  • the pulp suspension S enters the substantially cylindrical inner space 14 of the rotor 13 and is set in rapid rotation. This principle corresponds to that of a solid bowl centrifuge.
  • the contained gases 7 migrate inwardly as a result of the centrifugal forces and are sucked out of the center by a vacuum device 10 (only roughly indicated).
  • a phase boundary forms liquid / gaseous in the container.
  • the centrifugal forces can be at least 5 times, preferably 10 times the gravitational acceleration.
  • the vacuum device 10 does not require a negative pressure which corresponds to the vapor pressure of the suspension or is in the vicinity thereof. Conventional values for the negative pressure of a vacuum device 10 used here are 0.8 to 0.9 bar. As will be shown later, this rotor-driven degassing device 6 can also be omitted.
  • the suspension is sucked with a fuel pump 9 and here in a closed system (ie without open containers or laid paper) up to the headbox 1 out.
  • a closed system ie without open containers or laid paper
  • Foreign matter through a cleaner 17 excreted.
  • the effort that needs to be done for these hydrocyclones will depend on the raw materials as well as the quality requirements of the paper produced. If, for example, the thick matter suspension 4 was formed from waste paper, there may still be sand and small plastic parts.
  • the cleaner system 17 will operate with a consistency (solids content of the suspension) that is higher than that in the headbox 1, which saves eg investment and energy costs.
  • the diluting liquid 25 can then be admixed with the accepts of the cleaner system 17 via a mixing device 26.
  • a headbox pump 3 For the acceptance of the cleaner 17 a headbox pump 3 is installed to increase the pressure, the pressure build-up is large enough so that the headbox 1 a paper machine 2 can be operated properly.
  • the accepts the cleaner 17 enters a sorting system 18, which is one or more pressure graders, which are connected upstream of the headbox pump 3. As a result, the high pressures required for the headbox do not occur in the sorting unit 18, so do not load the pressure graders. Similar considerations as in the consistency of the cleaner 17 can also be made in the sorting system 18. Then their accepts would be mixed with a dilution liquid 27 via a mixing device 28.
  • the paper production on the paper machine 2 is caused by pressure pulsations, e.g. can be derived from the headbox pump 3 or the system in front, is impaired, it can be provided in the closed system in front of the headbox 1, a pulsation damper 15, which, for. degrades the disturbing pulsations by a plurality of hydraulically effective throttle bodies in a conventional manner.
  • a pulsation damper 15 which, for. degrades the disturbing pulsations by a plurality of hydraulically effective throttle bodies in a conventional manner.
  • the sorting system is preferably equipped with one or more pressure graders, which are equipped with at least one fixed rotationally symmetrical, in particular cylindrical screen basket 20 and a rotating scraper 21 moved past it.
  • the suspension is supplied through the inlet 22.
  • the accepts the sieve openings of the Strainer basket 20 has passed, leaves the housing of the pressure sorter 19 through the Gutstoffauslass 23 and the reject rejected by the Rejektauslass 24.
  • the pressure sorter 19 also has in the center of a degassing 25, which derive the accumulated in the center by the rotational flow of the suspension gases / air or aspirate. Precisely because the pressure in the pressure sorter is significantly lower than usual, better venting in conjunction with the invention is possible.

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

Abstract

Supplying a fiber suspension to the head box (1) of a paper or cardboard machine (2) comprises passing the suspension through a pressure sorter (18) operated in a closed system upstream of a head box pump (3).

Description

Die Erfindung betrifft ein Verfahren zur Zuführung einer Faserstoffsuspension gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for feeding a pulp suspension according to the preamble of claim 1.

Derartige Verfahren und die dazu benötigten Stoffzuführsysteme sind grundsätzlich bekannt. Die zuzuführende Faserstoffsuspension erhält den größten Teil der Fasern aus einer in der Stoffaufbereitungsanlage bereitgestellten Dickstoffsuspension. Letztere weist z.B. eine typische Konsistenz, d.h. einen Trockengehalt zwischen 2,5 und 5 % auf. Durch Zumischung von Verdünnungsflüssigkeit, z.B. Siebwasser der Papiermaschine, wird die Konsistenz auf einen Wert abgesenkt, der für den Betrieb des Stoffauflaufes der Papiermaschine günstig ist. Das können z.B. 1 bis 2 % sein. Die so gebildete Faserstoffsuspension wird, nachdem die meisten oder alle Bestandteile in der richtigen Menge enthalten sind, über die Stoffauflaufpumpe zum Stoffauflauf einer Papier- oder Kartonmaschine gefördert. Zwischen dieser Stoffauflaufpumpe und dem Stoffauflauf befindet sich ein geschlossenes System, welches unter Überdruck steht, damit die Faserstoffsuspension auf das oder die Siebe der Papiermaschine gelangen kann.Such methods and the required Stoffzuführsysteme are basically known. The pulp suspension to be supplied receives most of the fibers from a thick stock suspension provided in the stock preparation plant. The latter has e.g. a typical consistency, i. a dry content between 2.5 and 5%. By admixing dilution liquid, e.g. White water of the paper machine, the consistency is lowered to a value that is favorable for the operation of the headbox of the paper machine. This can e.g. 1 to 2%. The fibrous suspension so formed, after most or all of the ingredients are contained in the correct amount, is conveyed via the headbox pump to the head box of a paper or board machine. Between this headbox pump and the headbox is a closed system, which is under pressure, so that the pulp suspension can get to the or the screens of the paper machine.

Moderne Stoffaufläufe haben wegen ihrer hydraulischen Funktionen einen beträchtlichen Druckabfall, weshalb der Zulaufraum des Stoffauflaufes unter hohem Überdruck steht. Dieser benötigte Druckabfall steigert sich weiter, wenn die Papier- oder Kartonmaschine ein sogenannter Schnellläufer ist, also z.B. bei Geschwindigkeiten über 1500 m/Min produziert. Wegen dieses hohen Druckes muss auch der erwähnte Drucksortierer für solche Drücke ausgelegt sein, was zwar möglich ist, aber zu einem beträchtlichen Aufwand geführt hat. Ein entsprechendes Anlagenbeispiel zeigt die DE 100 50 109 A1 .Modern headboxes have a considerable pressure drop because of their hydraulic functions, which is why the inlet space of the headbox is under high pressure. This required pressure drop further increases when the paper or board machine is a so-called high-speed machine, ie, for example, produced at speeds above 1500 m / min. Because of this high pressure and the aforementioned pressure sorter must be designed for such pressures, which is possible, but has led to considerable effort. A corresponding system example shows the DE 100 50 109 A1 ,

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der o.g. Art zu schaffen, mit dem die Druckbelastung des unmittelbar vor dem Stoffauflauf stehenden Drucksortierers reduziert werden kann.The invention is based on the object to provide a method of the type mentioned above, with which the pressure load of the directly before the headbox Drucksortierers can be reduced.

Zur Lösung dieser Aufgabe ist ein Verfahren mit den Merkmalen des Anspruchs 1 vorgesehen. Bei Anwendung dieser Erfindung geht man bewusst von der bisherigen Einstellung ab, der Drucksortierer müsse mit seiner Funktion als "Polizeifilter" unmittelbar vor dem Stoffauflauf stehen, weil nur dadurch eine Beschädigung des Stoffauflaufes durch störende Feststoffteile verhindert werden kann. Solche störenden Teile kommen üblicherweise nicht aus dem Rohstoff (der ist bereits durch mehrmaliges Sortieren und Reinigen von störenden Schwerteilen befreit), sondern geraten zufälligerweise in die Papierfasersuspension. So können z.B. durch Wartungsarbeiten Eisenteile in eine Maschinenbütte fallen oder in einem gewarteten Apparat unbemerkt liegen bleiben. Bei Wiederanlauf der Anlage nach der Wartung wäre dann eine fatale Betriebsstörung die Folge. Auch wenn die Wahrscheinlichkeit, dass so etwas passiert, äußerst gering ist, wird in Anbetracht der möglichen großen Schadenshöhe alles getan, um im geschlossenen System schwerteilfrei zu sein. Durch die Erfindung lässt sich die Forderung nach optimaler Sicherheit verbinden mit der Möglichkeit, die Drücke im Stoffauflauf weiter zu steigern, um dadurch höhere Papiermaschinengeschwindigkeiten fahren zu können. Aber auch bei nicht erhöhter Papiermaschinengeschwindigkeit kann die Erfindung von Vorteil sein, da die Anforderungen an die Drucksortierer, wie Festigkeit des Gehäuses, der Dichtungen und der Sortierkörbe geringer sind, was wiederum ökonomische Vorteile hat.To solve this problem, a method having the features of claim 1 is provided. When using this invention, it is deliberately from the previous setting, the pressure sorter must be with his function as a "police filter" immediately in front of the headbox, because only damage to the headbox can be prevented by disturbing solid parts. Such disturbing parts usually do not come from the raw material (which is already freed by repeated sorting and cleaning of disturbing heavy parts), but accidentally fall into the paper fiber suspension. Thus, e.g. due to maintenance work, iron parts fall into a machine chest or remain unnoticed in a maintained device. When restarting the system after maintenance then a fatal malfunction would result. Even though the likelihood of this happening is extremely low, given the potential large amount of damage, everything is done to be free from gravity in the closed system. The invention makes it possible to combine the requirement for optimum safety with the possibility of further increasing the pressures in the headbox in order to be able to drive higher paper machine speeds. But even with not increased paper machine speed, the invention may be advantageous because the demands on the pressure sorters, such as strength of the housing, the seals and the sorting baskets are lower, which in turn has economic advantages.

Die Erfindung und ihre Vorteile werden erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
ein Verfahrensschema als Ausführungsbeispiel für das erfindungsgemäße Verfahren;
Fig. 2
einen zur Ausführung des Verfahrens besonders geeigneten Drucksortierer;
Fig. 3
eine vereinfachte Variante des Verfahrens.
The invention and its advantages will be explained with reference to drawings. Showing:
Fig. 1
a process scheme as an embodiment of the inventive method;
Fig. 2
a pressure sorter particularly suitable for carrying out the method;
Fig. 3
a simplified variant of the method.

Das Schema der Fig. 1 zeigt ein Beispiel zur Durchführung des erfindungsgemäßen Verfahrens. Eine Faserstoffsuspension S wird in der üblichen Weise durch Vermischung einer Dickstoffsuspension 4 mit einer Verdünnungsflüssigkeit 5 erzeugt und hat danach im Wesentlichen die für den Betrieb des Stoffauflaufes 1 der Papier- oder Kartonmaschine 2 an dieser Stelle gewünschte Konsistenz. Bekanntlich liegen Stoffauflauf-Konsistenzen im Bereich zwischen 0,5 und 2 %, in der Regel um 1 %. Die Verdünnungsflüssigkeit 5, die an einer Mischstelle 8 zugeführt wird, stammt bei dem hier gezeigten Beispiel aus dem ersten Siebwasser 12, also dem im Formierbereich der Papier- oder Kartonmaschine 2 angefallenen Wasser. Es wird oft als "Siebwasser I" (SWI) bezeichnet im Unterschied zum später auf der Papiermaschine anfallenden zweiten Siebwasser 16 (SWII), das sehr viel weniger Feinstoffe enthält.The scheme of Fig. 1 shows an example for carrying out the method according to the invention. A pulp suspension S is produced in the usual manner by mixing a thick stock suspension 4 with a diluting liquid 5 and then has in Essentially the desired consistency for the operation of the headbox 1 of the paper or board machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%. The dilution liquid 5, which is supplied at a mixing point 8, originates in the example shown here from the first white water 12, that is, the water incurred in the forming area of the paper or board machine 2. It is often referred to as "white water I" (SWI), unlike the later on the paper machine resulting second white water 16 (SWII), which contains much less fines.

Das Siebwasser wird unterhalb des Papiermaschinen-Siebes aufgefangen und seitlich abgeleitet. In den dazu benutzten offenen Rinnen kann bereits ein großer Teil der enthaltenen Luft austreten. Dennoch ist es oft sinnvoll, einen weiteren Gasanteil 7 in einem speziellen Behälter 11 auszuscheiden, wie er z.B. aus der DE 199 38 799 bekannt ist. Zur Unterstützung kann der Behälter 11 unter einem mäßigen Unterdruck stehen. Nach dem Vermischen von Dickstoffsuspension 4 und Verdünnungsflüssigkeit 5 wird hier eine Entgasungsvorrichtung 6 verwendet. Diese ist als zylindrischer oder konischer Behälter aufgebaut und erfindungsgemäß mit einem Rotor 13 versehen. Die Faserstoffsuspension S gelangt in den im Wesentlichen zylindrischen Innenraum 14 des Rotors 13 und wird in schnelle Rotation versetzt. Dieses Prinzip entspricht dem einer Vollmantelzentrifuge. Die enthaltenen Gase 7 wandern in Folge der Fliehkräfte nach innen und werden durch eine - nur grob angedeutete - Vakuumeinrichtung 10 aus dem Zentrum abgesaugt. Dabei bildet sich im Behälter eine Phasengrenze flüssig/gasförmig aus. Die Fliehkräfte können mindestens 5 Mal, vorzugsweise 10 Mal so groß wird die Erdbeschleunigung sein. Die Vakuumeinrichtung 10 benötigt keinen Unterdruck, der dem Dampfdruck der Suspension entspricht oder in dessen Nähe liegt. Übliche Werte für den Unterdruck einer hier verwendeten Vakuumeinrichtung 10 liegen bei 0,8 bis 0,9 bar. Wie später noch gezeigt wird, kann diese rotorgetriebene Entgasungsvorrichtung 6 auch weggelassen werden.The white water is collected below the paper machine sieve and discharged laterally. In the open channels used for this purpose, a large part of the air contained can already escape. Nevertheless, it often makes sense to eliminate a further gas portion 7 in a special container 11, as he eg from the DE 199 38 799 is known. To assist the container 11 may be under a moderate negative pressure. After mixing thick matter suspension 4 and diluting liquid 5, a degassing device 6 is used here. This is constructed as a cylindrical or conical container and provided according to the invention with a rotor 13. The pulp suspension S enters the substantially cylindrical inner space 14 of the rotor 13 and is set in rapid rotation. This principle corresponds to that of a solid bowl centrifuge. The contained gases 7 migrate inwardly as a result of the centrifugal forces and are sucked out of the center by a vacuum device 10 (only roughly indicated). In this case, a phase boundary forms liquid / gaseous in the container. The centrifugal forces can be at least 5 times, preferably 10 times the gravitational acceleration. The vacuum device 10 does not require a negative pressure which corresponds to the vapor pressure of the suspension or is in the vicinity thereof. Conventional values for the negative pressure of a vacuum device 10 used here are 0.8 to 0.9 bar. As will be shown later, this rotor-driven degassing device 6 can also be omitted.

Aus der Entgasungsvorrichtung 6 wird die Suspension mit einer Stoffpumpe 9 abgesaugt und hier in einem geschlossenen System (also ohne offene Behälter oder Bütten) bis zum Stoffauflauf 1 geführt. Dabei wird hier in der üblichen Weise der Rest an noch vorhandenen Störstoffen durch eine Cleaneranlage 17 ausgeschieden. Selbstverständlich wird der Aufwand, der für diese Hydrozyklone betrieben werden muss, von den Rohstoffen sowie den Anforderungen an die Qualität des erzeugten Papieres abhängen. Wenn z.B. die Dickstoffsuspension 4 aus Altpapier gebildet wurde, können noch Sand und kleine Plastikteile vorhanden sein. Gelegentlich wird die Cleaneranlage 17 mit einer Konsistenz (Feststoffgehalt der Suspension) betreiben, die höher liegt als die im Stoffauflauf 1, was z.B. Investitions- und Energiekosten spart. Dann kann dem Gutstoff der Cleaneranlage 17 eine Verdünnungsflüssigkeit 25 über eine Mischeinrichtung 26 zugemischt werden.From the degassing device 6, the suspension is sucked with a fuel pump 9 and here in a closed system (ie without open containers or laid paper) up to the headbox 1 out. Here is the rest of remaining in the usual way Foreign matter through a cleaner 17 excreted. Of course, the effort that needs to be done for these hydrocyclones will depend on the raw materials as well as the quality requirements of the paper produced. If, for example, the thick matter suspension 4 was formed from waste paper, there may still be sand and small plastic parts. Occasionally, the cleaner system 17 will operate with a consistency (solids content of the suspension) that is higher than that in the headbox 1, which saves eg investment and energy costs. The diluting liquid 25 can then be admixed with the accepts of the cleaner system 17 via a mixing device 26.

Für den Akzept der Cleaneranlage 17 ist zur Druckerhöhung eine Stoffauflauf-Pumpe 3 installiert, deren Druckaufbau groß genug ist, so dass der Stoffauflauf 1 einer Papiermaschine 2 sinnvoll betrieben werden kann. Der Gutstoff der Cleaneranlage 17 gelangt in eine Sortieranlage 18, bei der es sich um einen oder mehrere Drucksortierer handelt, die stromaufwärts der Stoffauflaufpumpe 3 geschaltet sind. Das führt dazu, dass die für den Stoffauflauf erforderlichen hohen Drücke nicht in der Sortieranlage 18 auftreten, also nicht die Drucksortierer belasten. Ähnliche Überlegungen wie bei der Konsistenz der Cleaneranlage 17 können auch bei der Sortieranlage 18 angestellt werden. Dann wäre deren Gutstoff mit einer Verdünnungsflüssigkeit 27 über eine Mischeinrichtung 28 zu vermischen.For the acceptance of the cleaner 17 a headbox pump 3 is installed to increase the pressure, the pressure build-up is large enough so that the headbox 1 a paper machine 2 can be operated properly. The accepts the cleaner 17 enters a sorting system 18, which is one or more pressure graders, which are connected upstream of the headbox pump 3. As a result, the high pressures required for the headbox do not occur in the sorting unit 18, so do not load the pressure graders. Similar considerations as in the consistency of the cleaner 17 can also be made in the sorting system 18. Then their accepts would be mixed with a dilution liquid 27 via a mixing device 28.

Für den Fall, dass die Papierproduktion auf der Papiermaschine 2 durch Druckpulsationen, die z.B. aus der Stoffauflaufpumpe 3 oder dem davor liegenden System stammen können, beeinträchtigt wird, kann man im geschlossenen System vor dem Stoffauflauf 1 einen Pulsationsdämpfer 15 vorsehen, der z.B. durch eine Vielzahl von hydraulisch wirksamen Drosselstellen in an sich bekannter Weise die störenden Pulsationen abbaut.In the event that the paper production on the paper machine 2 is caused by pressure pulsations, e.g. can be derived from the headbox pump 3 or the system in front, is impaired, it can be provided in the closed system in front of the headbox 1, a pulsation damper 15, which, for. degrades the disturbing pulsations by a plurality of hydraulically effective throttle bodies in a conventional manner.

Die Sortieranlage wird vorzugsweise mit einem oder mehreren Drucksortierern ausgestattet, die mit mindestens einem feststehenden rotationssymmetrischen, insbesondere zylindrischen Siebkorb 20 und einem daran vorbei bewegten rotierenden Räumer 21 ausgestattet sind. Exemplarisch und schematisch ist das in Fig. 2 gezeigt. Die Suspension wird durch den Einlass 22 zugeführt. Der Gutstoff, der die Sieböffnungen des Siebkorbes 20 passiert hat, verlässt das Gehäuse des Drucksortierers 19 durch den Gutstoffauslass 23 und der abgewiesene Rejekt durch den Rejektauslass 24. Der Drucksortierer 19 weist ferner im Zentrum einen Entgasungsanschluss 25 auf, der die im Zentrum durch die Rotationsströmung der Suspension angesammelten Gase/Luft ableiten oder absaugen kann. Gerade, weil der Druck im Drucksortierer deutlich geringer ist als üblich, ist eine bessere Entlüftung im Zusammenwirken mit der Erfindung möglich.The sorting system is preferably equipped with one or more pressure graders, which are equipped with at least one fixed rotationally symmetrical, in particular cylindrical screen basket 20 and a rotating scraper 21 moved past it. By way of example and schematically, this is shown in FIG. 2. The suspension is supplied through the inlet 22. The accepts the sieve openings of the Strainer basket 20 has passed, leaves the housing of the pressure sorter 19 through the Gutstoffauslass 23 and the reject rejected by the Rejektauslass 24. The pressure sorter 19 also has in the center of a degassing 25, which derive the accumulated in the center by the rotational flow of the suspension gases / air or aspirate. Precisely because the pressure in the pressure sorter is significantly lower than usual, better venting in conjunction with the invention is possible.

Es gibt durchaus Anwendungsfälle, bei denen weniger Aufwand zur Entgasung bzw. Entlüftung der Faserstoffsuspension vor dem Stoffauflauf vorgenommen werden muss. In solchen Fällen kann - wie in Fig. 3 gezeigt - die rotorgetriebene Entgasungsvorrichtung 6 entfallen, was das System natürlich wesentlich vereinfacht und verbilligt.There are certainly applications in which less effort for degassing or venting of the pulp suspension must be made before the headbox. In such cases, as shown in Fig. 3, the rotor-driven degassing 6 omitted, which of course significantly simplifies the system and cheaper.

Claims (10)

Verfahren zur Zuführung einer Faserstoffsuspension (S1), zu mindestens einem Stoffauflauf (1) einer Papier- oder Kartonmaschine (2),
wobei die Faserstoffsuspension (S) vor Erreichen des Stoffauflaufes (1) zwangsweise mindestens einen Drucksortierer (19) einer Sortieranlage (18) durchströmt und
wobei die Faserstoffsuspension (S) mittels einer Stoffauflaufpumpe (3) auf den für den Stoffauflauf (1) benötigten Druck gebracht wird,
dadurch gekennzeichnet,
dass die Sortieranlage (18) im geschlossenen System stromaufwärts vor der Stoffauflaufpumpe (3) betrieben wird.Method for feeding a pulp suspension (S1) to at least one headbox (1) of a paper or board machine (2),
wherein the pulp suspension (S) forcibly passes before reaching the headbox (1) at least one pressure sorter (19) of a sorting system (18) and
the pulp suspension (S) being brought to the pressure required for the headbox (1) by means of a headbox pump (3),
characterized,
that the sorting system (18) is operated in a closed system upstream of the headbox feed pump (3). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass zwischen der Stoffauflaufpumpe (3) und dem Stoffauflauf (1) eine Dämpfung von hydraulischen Pulsationen mit Hilfe eines Pulsationsdämpfers (15) vorgenommen wird.Method according to claim 1,
characterized,
that between the headbox pump (3) and the headbox (1) an attenuation of hydraulic pulsations by means of a pulsation damper (15) is made. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der Stoffauflauf (1) mit einem Druck betrieben wird, der größer ist als 3 bar.Method according to one of the preceding claims,
characterized,
that the headbox (1) is operated at a pressure which is greater than 3 bar. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Papier- oder Kartonmaschine (2) mit einer Geschwindigkeit von mehr als 1800 m/min betrieben wird.Method according to one of the preceding claims,
characterized,
that the paper or board machine (2) is operated at a speed of more than 1800 m / min. Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
dass die Papier- oder Kartonmaschine (2) mit einer Geschwindigkeit von mehr als 2300 m/min betrieben wird.Method according to claim 4,
characterized,
that the paper or board machine (2) is operated at a speed of more than 2300 m / min. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Faserstoffsuspension (S) durch Vermischen von Siebwasser (12) aus der Papier- oder Kartonmaschine (2) mit einer Dickstoffsuspension (4) gebildet wird und dass diese in der Stoffaufbereitungsanlage bereit gestellt wird.Method according to one of the preceding claims,
characterized,
in that the pulp suspension (S) is formed by mixing white water (12) from the paper or board machine (2) with a thick matter suspension (4) and that it is provided in the stock preparation plant. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Entlüftung bzw. Entgasung der Faserstoffsuspension nur stromaufwärts vor der Sortieranlage (18) durchgeführt wird.Method according to one of the preceding claims,
characterized,
that the venting or degassing of the pulp suspension is only carried out upstream in front of the sorting system (18). Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass die Faserstoffsuspension (S) stromaufwärts vor der Sortieranlage (18) mittels einer weiteren Pumpe (9) über eine stromabwärts zu dieser angeordneten Hydrozyklonanlage (17) geführt wird.Method according to one of the preceding claims,
characterized,
that the pulp suspension (S) upstream of the sorting system (18) by means of a further pump (9) via a downstream arranged to this hydrocyclone plant (17) is guided. Verfahren nach Anspruch 8,
dadurch gekennzeichnet,
dass die Entlüftung bzw. Entgasung der Faserstoffsuspension nur stromaufwärts vor der weiteren Pumpe (9) durchgeführt wird.Method according to claim 8,
characterized,
that the venting or degassing of the pulp suspension is carried out upstream of the further pump (9). Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass in der Sortieranlage (18) mindestens ein Drucksortierer (19) betrieben wird, mit einem nicht rotierenden rotationssymmetrischen Siebkorb 20 und einem rotierenden Räumer (21) zur Freihaltung der Sieböffnungen des Siebkorbes (20).Method according to one of the preceding claims,
characterized,
in that at least one pressure sorter (19) is operated in the sorting installation (18), with a non-rotating rotationally symmetrical screen basket 20 and a rotating scraper (21) for keeping free the screen openings of the screen basket (20).
EP07013179A 2006-08-02 2007-07-05 Method for feeding a fibrous material suspension into a headbox Withdrawn EP1884591A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200610035956 DE102006035956B3 (en) 2006-08-02 2006-08-02 Supplying a fiber suspension to the head box of a paper or cardboard machine comprises passing the suspension through a pressure sorter (operated in a closed system upstream of a head box pump

Publications (1)

Publication Number Publication Date
EP1884591A1 true EP1884591A1 (en) 2008-02-06

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Application Number Title Priority Date Filing Date
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EP (1) EP1884591A1 (en)
DE (1) DE102006035956B3 (en)

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WO1983002293A1 (en) * 1981-12-30 1983-07-07 Nils Anders Lennart Wikdahl Method and plant for deaerating fibre suspensions
US5707488A (en) * 1994-10-20 1998-01-13 International Paper Company Screen/vortex apparatus for cleaning recycled pulp related process
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