EP1595998B1 - Method and device for mixing and degasing material flows - Google Patents

Method and device for mixing and degasing material flows Download PDF

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Publication number
EP1595998B1
EP1595998B1 EP05009018.2A EP05009018A EP1595998B1 EP 1595998 B1 EP1595998 B1 EP 1595998B1 EP 05009018 A EP05009018 A EP 05009018A EP 1595998 B1 EP1595998 B1 EP 1595998B1
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Prior art keywords
degassing
pulp
suspension
paper machine
mixing
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German (de)
French (fr)
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EP1595998A1 (en
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Josef Glawogger
Erich Harzl
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Andritz AG
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Andritz AG
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/26—De-aeration of paper stock
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a method for mixing streams, in particular in the constant part of a paper machine, and a device for carrying out the method.
  • a pulp suspension is applied evenly distributed on a sieve and removed in the first part a large part of the water. In particular impurities are removed before the suspension is applied to the sieve.
  • the pulp suspension also contains gas, in particular air, as free air in the form of bubbles and as dissolved air. This air, especially in the form of bubbles, causes problems in the papermaking process, especially if they are in larger quantities. This can lead to foaming problems, instabilities of the process, pulsations in the constant part of the paper machine, reduced drainage performance and, as a consequence, small holes in the paper web.
  • the various fiber components (long fibers, short fibers, rejects, etc.) are currently being combined in a container and mixed.
  • various chemical adjuvants e.g., wet strength agent, paint, filler, etc.
  • the individual components and also auxiliaries can be introduced into a mixing pipeline.
  • the problem with these circuit variants is that the substances are mixed only insufficient and additionally have a high gas content, which is contained in both the individual streams of pulp components, as well as in the white water.
  • the EP 0 543 866 B1 shows, for example, a plant in which the gas is removed from the previously mixed substance and from the white water of the paper machine by means of several pumps. However, the mixing of pulp components and auxiliaries is not accomplished.
  • the EP 1 347 094 A1 (Andritz AG ) describes a device for degassing and simultaneous mixing of chemicals. In such a device not the entire mixture but only a part is degassed.
  • the WO 95/10350 (Kvaerner Pulping Technologies AB) discloses a method and apparatus where a fluid, preferably an ozone-containing gas, is fed to a pulp suspension. Inert carrier gas and unused ozone are then separated from the pulp suspension in a gas separator.
  • the invention now wants to prevent these disadvantages and is therefore characterized in that the individual material flows are brought together in a first process step and mixed together in a second process step and simultaneously degassed.
  • simultaneous degassing results in a constant state after mixing, which makes it possible to dispense with the previously required large mixing vessel.
  • an accurate measurement of physical properties, in particular the consistency allows.
  • dilution water for example white water from a paper machine
  • the white water can also be deaerated. This can be achieved in many cases, a degree of ventilation, which makes a complex vacuum ventilation superfluous.
  • the consistency of the pulp suspension is measured after mixing and degassing and the supply of dilution water is carried out depending on the consistency of the mixed and degassed pulp suspension.
  • dilution water By the good mixing of the dilution water also a high accuracy can be achieved. But there may be others as well Material values such as ash content, whiteness or degree of grinding can be measured particularly accurately online.
  • An advantageous embodiment of the invention is characterized in that the mixed and degassed suspension is a storage container, eg Maschinenbütte, standpipe, is supplied.
  • a storage container eg Maschinenbütte, standpipe
  • the storage container can be even further homogenization and in particular an elimination of any pulsations reached, but should be paid to a small volume, so that a variety change or color change can be performed quickly.
  • the previous good mixing can be dispensed with the previously required Mischbütte.
  • the invention also relates to a device for mixing streams, in particular in the constant part of a paper machine.
  • a degassing device in particular a rotor with degassing
  • a mixing pipe This allows a particularly good mixing while degassing the pulp suspension can be achieved.
  • a plurality of pipelines for material flows, in particular pulp components, open into the mixing pipeline upstream of the degassing device, with a dilution water line also opening into the mixing pipeline.
  • a dilution water line also opening into the mixing pipeline.
  • the mixing and homogenization is much more intensive here than by means of a mixing vessel.
  • the invention is further characterized in that a measuring device for at least one material value of the suspension is provided downstream of the degassing device, the measuring device being a consistency measuring device which is connected via a regulating device to a valve in the dilution water line.
  • the consistency of the pulp suspension in the feed to the paper machine can be set particularly accurately.
  • other measuring devices such as, for example, whiteness, ash content or freeness can be used, which provide particularly accurate measured values, in particular because of the virtually gas-free and homogeneous suspension.
  • a particularly advantageous embodiment of the invention is characterized in that the white water line of a paper machine opens into the mixing pipe.
  • the entire white water can be degassed together with the admixed substances, in particular pulp components.
  • a favorable variant of the invention is characterized in that the mixing pipe is connected to the degassing device with a storage container, said storage container can be designed as a standpipe.
  • the standpipe can in this case form a communicating vessel with the white water container, as a result of which the system becomes self-regulating.
  • An alternative advantageous embodiment of the invention is characterized in that the mixing tube is connected to the degassing device with a pump. This results in particularly low storage volumes and thus a particularly favorable possibility for variety or color change of production.
  • the invention makes it possible to avoid large degassing tanks, which leads to large investment savings. It can thus also realize a "short flow" concept in a simple and inexpensive way.

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

Description

Die Erfindung betrifft ein Verfahren zur Vermischung von Stoffströmen, insbesondere im Konstantteil einer Papiermaschine, sowie eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for mixing streams, in particular in the constant part of a paper machine, and a device for carrying out the method.

Bei der Papierherstellung wird eine Faserstoffsuspension gleichmäßig verteilt auf ein Sieb aufgegeben und im ersten Teil ein Großteil des Wassers entfernt. Vor der Aufgabe der Suspension auf das Sieb werden insbesondere Verunreinigungen entfernt. In der Faserstoffsuspension ist auch Gas, insbesondere Luft, als freie Luft in Form von Blasen und als gelöste Luft enthalten. Diese Luft, speziell in Form von Blasen, führt im Papierherstellungsprozess zu Problemen, insbesondere, wenn diese in größerer Menge vorliegen. Dadurch kann es zu Schaumproblemen, Instabilitäten des Prozesses, Pulsationen im Konstantteil der Papiermaschine, verminderter Entwässerungsleistung und in weiterer Folge zu kleinen Löchern in der Papierbahn kommen.In papermaking, a pulp suspension is applied evenly distributed on a sieve and removed in the first part a large part of the water. In particular impurities are removed before the suspension is applied to the sieve. The pulp suspension also contains gas, in particular air, as free air in the form of bubbles and as dissolved air. This air, especially in the form of bubbles, causes problems in the papermaking process, especially if they are in larger quantities. This can lead to foaming problems, instabilities of the process, pulsations in the constant part of the paper machine, reduced drainage performance and, as a consequence, small holes in the paper web.

Ein Verfahren zur weitestgehenden Entgasung wird z.B. in der US 4,219,340 beschrieben. Diese Evakuierung ist jedoch sehr aufwändig und in vielen Fällen ist auch eine vollständige Evakuierung nicht erforderlich.A method for the largest possible degassing is eg in the US 4,219,340 described. However, this evacuation is very complex and in many cases, a complete evacuation is not required.

Im Konstantteil der Papiermaschine werden derzeit die verschiedenen Faserstoffkomponenten (Langfasern, Kurzfasern, Ausschuss, etc.) in einem Behälter zusammengegeben und gemischt. Dazu kommen noch verschiedene chemische Hilfsstoffe (z.B. Nassfestmittel, Farbe, Füllstoff, etc.). Alternativ können die einzelnen Komponenten und auch Hilfsstoffe in eine Mischrohrleitung eingebracht werden.In the constant part of the paper machine, the various fiber components (long fibers, short fibers, rejects, etc.) are currently being combined in a container and mixed. There are also various chemical adjuvants (e.g., wet strength agent, paint, filler, etc.). Alternatively, the individual components and also auxiliaries can be introduced into a mixing pipeline.

Das Problem bei diesen Schaltungsvarianten liegt darin, dass die Stoffe nur ungenügend vermischt werden und zusätzlich einen hohen Gasanteil aufweisen, wobei dieser sowohl in den einzelnen Strömen der Faserstoffkomponenten, als auch im Siebwasser enthalten ist. Die EP 0 543 866 B1 zeigt z.B. eine Anlage, bei der das Gas aus dem vorher vermischten Stoff sowie aus dem Siebwasser der Papiermaschine mittels mehrerer Pumpen entfernt wird. Die Vermischung von Faserstoffkomponenten und Hilfsstoffen wird jedoch nicht bewerkstelligt.The problem with these circuit variants is that the substances are mixed only insufficient and additionally have a high gas content, which is contained in both the individual streams of pulp components, as well as in the white water. The EP 0 543 866 B1 shows, for example, a plant in which the gas is removed from the previously mixed substance and from the white water of the paper machine by means of several pumps. However, the mixing of pulp components and auxiliaries is not accomplished.

Die Sensoren für Mengen- und Konsistenzmessung befinden sich zwar im entlüfteten Stoff, doch fehlt eine Vorrichtung für die homogene Einmischung des Verdünnungswassers.
Die EP 1 347 094 A1 (Andritz AG ) beschreibt eine Vorrichtung zur Entgasung und gleichzeitigen Einmischung von Chemikalien. Bei einer derartigen Vorrichtung wird nicht die gesamte Mischung sondern nur ein teil entgast. Die WO 95/10350 (Kvaerner Pulping Technologies AB) offenbart ein Verfahren und eine Vorrichtung wo ein Fluid, vorzugsweise ein ozonhältiges Gas, einer Faserstoffsuspension zugeführt wird. Inertes Trägergas und nicht konsumiertes Ozon werden anschließend von der Faserstoffsuspension in einem Gasabscheider abgetrennt.
Die Erfindung will nun diese Nachteile verhindern und ist daher dadurch gekennzeichnet, dass die einzelnen Stoffströme in einem ersten Verfahrensschritt zusammengeführt und in einem zweiten Verfahrensschritt miteinander vermischt und gleichzeitig entgast werden. Durch diese gleichzeitige Entgasung ergibt sich nach der Mischung ein konstanter Zustand, der es ermöglicht, auf den bisher notwendigen großen Mischbehälter zu verzichten. Auch wird eine genaue Messung von Stoffwerten, insbesondere der Konsistenz, ermöglicht.
Erfindungsgemäß wird zu den einzelnen Stoffströmen Verdünnungswasser, z.B. Siebwasser aus einer Papiermaschine, eingemischt, wobei auch das gesamte Siebwasser eingemischt werden kann. Bei Mischung der Faserstoffkomponenten mit dem Siebwasser kann dann auch das Siebwasser mitentlüftet werden. Damit kann in vielen Fällen ein Entlüftungsgrad erzielt werden, der eine aufwändige Vakuumentlüftung überflüssig macht. Gemäß dieser Erfindung wird nach Vermischung und Entgasung die Konsistenz der Faserstoffsuspension gemessen und die Zufuhr der Verdünnungswassermenge erfolgt in Abhängigkeit der Konsistenz der vermischten und entgasten Faserstoffsuspension. Durch die gute Einmischung des Verdünnungswassers kann auch eine hohe Genauigkeit erreicht werden. Es können aber auch zusätzlich andere Stoffwerte wie z.B. Aschegehalt, Weiße oder Mahlgrad besonders exakt online gemessen werden.Although the sensors for quantity and consistency measurement are located in the deaerated material, a device for the homogeneous mixing of the dilution water is missing.
The EP 1 347 094 A1 (Andritz AG ) describes a device for degassing and simultaneous mixing of chemicals. In such a device not the entire mixture but only a part is degassed. The WO 95/10350 (Kvaerner Pulping Technologies AB) discloses a method and apparatus where a fluid, preferably an ozone-containing gas, is fed to a pulp suspension. Inert carrier gas and unused ozone are then separated from the pulp suspension in a gas separator.
The invention now wants to prevent these disadvantages and is therefore characterized in that the individual material flows are brought together in a first process step and mixed together in a second process step and simultaneously degassed. By this simultaneous degassing results in a constant state after mixing, which makes it possible to dispense with the previously required large mixing vessel. Also, an accurate measurement of physical properties, in particular the consistency, allows.
In accordance with the invention, dilution water, for example white water from a paper machine, is mixed in with the individual streams, wherein the entire white water can also be mixed in. When the pulp components are mixed with the white water, the white water can also be deaerated. This can be achieved in many cases, a degree of ventilation, which makes a complex vacuum ventilation superfluous. According to this invention, the consistency of the pulp suspension is measured after mixing and degassing and the supply of dilution water is carried out depending on the consistency of the mixed and degassed pulp suspension. By the good mixing of the dilution water also a high accuracy can be achieved. But there may be others as well Material values such as ash content, whiteness or degree of grinding can be measured particularly accurately online.

Besonders vorteilhaft ist es, wenn einzelne Faserstoffkomponenten vermischt werden, wobei auch Hilfsstoffe eingemischt werden können, da auf diese Weise eine homogene Stoffsuspension erzielt werden kann, wodurch auch eine homogene Papierbahn hergestellt werden kann.
Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass die vermischte und entgaste Suspension einem Speicherbehälter, z.B. Maschinenbütte, Standrohr, zugeführt wird. Durch den Speicherbehälter lässt sich noch eine weitere Vergleichmäßigung und insbesondere auch eine Elimination von eventuellen Pulsationen erreichen, wobei jedoch auf ein kleines Volumen geachtet werden sollte, damit ein Sortenwechsel oder Farbwechsel rasch durchgeführt werden kann. Durch die vorangehende gute Vermischung kann auf die bisher erforderliche Mischbütte verzichtet werden.
Besonders geringe Volumina und damit besonders günstige Sortenwechsel ergeben sich, wenn die vermischte und entgaste Suspension direkt einer Pumpe zugeführt wird.
Die Erfindung betrifft auch eine Vorrichtung zur Vermischung von Stoffströmen, insbesondere im Konstantteil einer Papiermaschine. Diese ist erfindungsgemäß dadurch gekennzeichnet, dass in einer Mischrohrleitung eine Entgasungsvorrichtung, insbesondere ein Rotor mit Entgasungsöffnungen, vorgesehen ist. Dadurch kann eine besonders gute Vermischung bei gleichzeitiger Entgasung der Faserstoffsuspension erreicht werden. Erfindungsgemäß münden mehrere Rohrleitungen für Stoffströme, insbesondere Faserstoffkomponenten, vor der Entgasungsvorrichtung in die Mischrohrleitung, wobei auch eine Verdünnungswasserleitung in die Mischrohrleitung mündet. So kann speziell die Konsistenz der Faserstoffsuspension besonders gut auf den gewünschten Wert geregelt werden. Die Vermischung und Homogenisierung ist hier viel intensiver, als mittels einer Mischbütte. Die Erfindung ist weiters dadurch gekennzeichnet, dass nach der Entgasungsvorrichtung ein Messgerät für zumindest einen Stoffwert der Suspension vorgesehen ist, wobei das Messgerät ein Konsistenzmessgerät ist, das über eine Regeleinrichtung mit einem Ventil in der Verdünnungswasserleitung verbunden ist. Damit lässt sich die Konsistenz der Faserstoffsuspension im Zulauf zur Papiermaschine besonders genau einstellen. Auch sind zusätzlich andere Messgeräte wie z.B. für Weißgrad, Aschegehalt oder Mahlgrad einsetzbar, die speziell wegen der nahezu gasfreien und homogenen Suspension besonders exakte Messwerte liefern.It is particularly advantageous if individual pulp components are mixed, it also being possible to mix in auxiliaries, since in this way a homogeneous pulp suspension can be achieved, as a result of which a homogeneous paper web can also be produced.
An advantageous embodiment of the invention is characterized in that the mixed and degassed suspension is a storage container, eg Maschinenbütte, standpipe, is supplied. By the storage container can be even further homogenization and in particular an elimination of any pulsations reached, but should be paid to a small volume, so that a variety change or color change can be performed quickly. By the previous good mixing can be dispensed with the previously required Mischbütte.
Particularly low volumes and thus particularly favorable grade change arise when the mixed and degassed suspension is fed directly to a pump.
The invention also relates to a device for mixing streams, in particular in the constant part of a paper machine. This is inventively characterized in that a degassing device, in particular a rotor with degassing, is provided in a mixing pipe. This allows a particularly good mixing while degassing the pulp suspension can be achieved. According to the invention, a plurality of pipelines for material flows, in particular pulp components, open into the mixing pipeline upstream of the degassing device, with a dilution water line also opening into the mixing pipeline. Thus, especially the consistency of the pulp suspension can be regulated particularly well to the desired value. The mixing and homogenization is much more intensive here than by means of a mixing vessel. The invention is further characterized in that a measuring device for at least one material value of the suspension is provided downstream of the degassing device, the measuring device being a consistency measuring device which is connected via a regulating device to a valve in the dilution water line. Thus, the consistency of the pulp suspension in the feed to the paper machine can be set particularly accurately. In addition, other measuring devices such as, for example, whiteness, ash content or freeness can be used, which provide particularly accurate measured values, in particular because of the virtually gas-free and homogeneous suspension.

Eine besonders günstige Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass in die Mischrohrleitung die Siebwasserleitung einer Papiermaschine mündet. Damit kann auch das gesamte Siebwasser gemeinsam mit den zugemischten Stoffen, insbesondere Faserstoffkomponenten, entgast werden.
Eine günstige Variante der Erfindung ist dadurch gekennzeichnet, dass die Mischrohrleitung nach der Entgasungsvorrichtung mit einem Speicherbehälter verbunden ist, wobei dieser Speicherbehälter als Standrohr ausgeführt sein kann. Das Standrohr kann hierbei mit dem Siebwasserbehälter ein kommunizierendes Gefäß bilden, wodurch das System selbstregulierend wird.
Eine alternative vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass das Mischrohr nach der Entgasungsvorrichtung mit einer Pumpe verbunden ist. Dadurch ergeben sich besonders geringe Speichervolumina und somit eine besonders günstige Möglichkeit bei Sorten- oder Farbenwechsel der Produktion.A particularly advantageous embodiment of the invention is characterized in that the white water line of a paper machine opens into the mixing pipe. Thus, the entire white water can be degassed together with the admixed substances, in particular pulp components.
A favorable variant of the invention is characterized in that the mixing pipe is connected to the degassing device with a storage container, said storage container can be designed as a standpipe. The standpipe can in this case form a communicating vessel with the white water container, as a result of which the system becomes self-regulating.
An alternative advantageous embodiment of the invention is characterized in that the mixing tube is connected to the degassing device with a pump. This results in particularly low storage volumes and thus a particularly favorable possibility for variety or color change of production.

Die Erfindung wird nun anhand der beigefügten Zeichnungen beispielhaft beschreiben, wobei

  • Fig. 1 eine Anlage nach dem Stand der Technik, Fig. 2 das Schema einer Variante der Erfindung, Fig. 3 eine weitere Variante der Erfindung, Fig. 4 eine nächste Variante der Erfindung, Fig. 5 eine Ausführung der Erfindung und Fig. 6 eine weitere Ausführung der Erfindung darstellt.
    Der in Fig. 1 dargestellte Konstantteil einer Papiermaschine, auch als Zulaufsystem bezeichnet, nach dem Stand der Technik umfasst einen Siebwasserbehälter 10, eine Speisepumpe 12, eine Fliehkraftreinigungsanlage 14, einen Gasabscheidebehälter 16 mit seiner Vakuumeinrichtung 17, eine Stoffauflaufpumpe 18, einen Sortierer 20, einen Stoffauflauf 22 der Papiermaschine und (nicht dargestellte) Siebwasserauffangtröge. Bei der Papierherstellung verwendete Faserstoffkomponenten, wie z.B. frischer Faserstoff, Sekundärstoff und/oder Ausschuss sowie Füllstoffe, die mit dem aus der Siebpartie der Papiermaschine 24 erhaltenen Siebwasser verdünnt werden, werden durch eine Leitung 11 in den Siebwasserbehälter 10, in dem die Siebwässer der Papiermaschine gesammelt werden, eingebracht. Durch eine Speisepumpe 12 wird die Faserstoffsuspension vom Siebwasserbehälter 10 zur Fliehkraftreinigungsanlage 14 gepumpt. Der von der ersten Stufe der Fliehkraftreinigungsanlage 14 akzeptierte Stoff wird durch den von der Speisepumpe erzeugten Druck und begünstigt durch das Vakuum im Gasabscheidebehälter 16 in diesen gefördert. Vom Gasabscheidebehälter 16 fließt die im Wesentlichen gasfreie Faserstoffsuspension, aus dem Gas möglichst restlos durch die Vakuumvorrichtung 17 entfernt wurde, zu einer Mischpumpe 18, die die Faserstoffsuspension zum Sortierer 20 pumpt, von wo der akzeptierte Faserstoff in den Stoffauflauf 22 der Papiermaschine 24 fließt. Der Gasabscheidebehälter 16 typischerweise in einer Ebene T über der Maschinenebene K angeordnet.
  • Fig. 2 zeigt das Schema einer Anlage gemäß der Erfindung. In ein Mischrohr 1 werden über Leitungen 2, 2', 2" verschiedene Faserstoffkomponenten zugeführt, wobei diese z.B. Primärstoff, Sekundärstoff und/oder Ausschuss sein können. Weiters sind Leitungen 3, 3' für Hilfsstoffe, wie z.B. Farbstoffe, Füllstoffe etc. vorgesehen, die in das Mischrohr 1 münden. Über Leitung 4 wird Verdünnungswasser zugeführt, wobei dies ein Teil des Siebwassers oder Klarwasser von einem Scheibenfilter sein kann. Nach Zufuhr aller Faser- und Hilfsstoffe wird die Suspension durch einen Entgasungsrotor 5 mit Antriebsmotor 6 vermischt und gleichzeitig entgast. Von der vermischten und entgasten Faserstoffsuspension wird mittels eines Konsistenzmessgerätes 7 die Konsistenz ermittelt und durch einen Regler 8 das Durchflussventil 9 der Verdünnungswasserleitung 4 geregelt. Nach dem Entgasungsrotor 5 können noch weitere Messgeräte 7 für z.B. Aschegehalt, Weißgrad oder Mahlgrad angeordnet sein, wobei durch die Entgasung die Messwerte sehr exakt sind. Die vermischte und entgaste Faserstoffsuspension gelangt dann in eine Maschinenbütte 15. Der Entgasungsrotor 5 erwirkt einen Druckaufbau, der die Behälterhöhe ausgleicht, so dass das Mischrohr 1 etwa Atmosphärendruck aufweist. Dies ist wichtig, da hier dann ein Großteil des Gases bzw. der Luft als Blasen vorliegt und sehr einfach durch den Entgasungsrotor 5 entfernt werden kann. Nach der Maschinenbütte 15 ist ein Durchflussmessgerät 13 angeordnet, das über einen Mengenregler 19 ein Durchflussventil 23 regelt. Die Regelung der Durchflussmenge kann nur dann sinnvoll erfolgen, wenn sichergestellt ist, dass die Konsistenz des Stoffstromes konstant ist und dem vorgesehenen Wert entspricht. Durch die vorgeschlagene Regelung kann dies gewährleistet werden. Nach der Durchflussmessung 13 wird die Faserstoffsuspension durch eine Stoffauflaufpumpe 18 dem Stoffauflauf 22 der Papiermaschine zugeführt.
  • Fig. 3 zeigt eine Variante der Erfindung mit einem Standrohr 25, das anstelle der Maschinenbütte 15 eingesetzt wird. Dieses Standrohr 25 bildet zusammen mit dem Siebwasserbehälter 10 ein System kommunizierender Gefäße, wobei die Flüssigkeitsoberflächen von Standrohr 25 und Siebwasserbehälter 10 auf selber Höhe liegen. Dadurch ergibt sich ein selbstregelnder Effekt für den Zulauf. Als Verdünnungswasser 4 wird hier ein Teil des Siebwassers eingesetzt.
  • In Fig. 4 ist eine ähnliche Variante dargestellt, wobei hier einerseits nahezu das gesamte Siebwasser 4' in das Mischrohr 1 geführt wird und anschließend die vermischte und entgaste Suspension direkt der Stoffauflaufpumpe 18 zugeführt wird. Dadurch wird das Speichervolumen der Anlage minimiert und Farb- und/oder Sortenwechsel können in kürzester Zeit durchgeführt werden.
  • Fig. 5 zeigt eine erfindungsgemäße Misch- und Entgasungsvorrichtung im Detail, wobei hier ein Mischrohr 1 vorgesehen ist, in das eine Leitung 4 mit Siebwasser mündet. In das Mischrohr 1 münden mehrere Leitungen 2, 2', 2" zur Zufuhr verschiedener Faserstoffkomponenten. Weiters sind Leitungen 3, 3' zur Zufuhr verschiedenster Hilfsmittel vorgesehen. Die abgesaugte Luft aus dem Entgasungsrotor 5 wird über eine Leitung 28 abgeführt. Der Entgasungsrotor 5 wird mittels eines Antriebes 6 angetrieben. Anschließend an den Entgasungsrotor 5 sind Messgeräte 7 für Konsistenzmessung und 7' für Messung weiterer Stoffwerte wie z.B. Aschegehalt, Weißgrad, Mahlgrad vorgesehen. Die vermischte und entgaste Suspension wird über eine Rohrleitung zu einem Behälter (Bütte) oder einer Zuführpumpe zum Stoffauflauf einer Papiermaschine geleitet. Bei entsprechender Ausgestaltung des Entgasungsrotors 5 kann die Suspension ohne weitere Pumpe direkt in einen Behälter geführt werden, wobei der Rotor 5 eine ausreichende Druckdifferenz erzeugt.
  • Fig. 6 zeigt eine weitere Variante der Erfindung, wobei eine Vormischung im Mischrohr 1 und die eigentliche Vermischung aller Stoffströme durch den Entgasungsrotor 5 durch eine Umlenkung 27 getrennt sind. Das Mischrohr 1, in das Verdünnungswasser 4 und Zufuhrleitungen 2, 2', 2" für einzelne Faserstoffkomponenten münden, weist eine Umlenkung 27 auf. Hier sind auch beispielhaft Zufuhrleitungen 3" für weitere Hilfsstoffe nach der Umlenkung 27 und kurz vor dem Entgasungsrotor 5 dargestellt, wobei dadurch eine günstige Verteilung der einzelnen Stoffe erzielt werden kann.
The invention will now be described by way of example with reference to the accompanying drawings, in which:
  • Fig. 1 a plant according to the prior art, Fig. 2 the scheme of a variant of the invention, Fig. 3 another variant of the invention, Fig. 4 a next variant of the invention, Fig. 5 an embodiment of the invention and Fig. 6 represents a further embodiment of the invention.
    The in Fig. 1 illustrated constant part of a paper machine, also referred to as feed system, according to the prior art comprises a white water tank 10, a feed pump 12, a centrifugal cleaning system 14, a gas separation vessel 16 with its vacuum device 17, a headbox pump 18, a sorter 20, a headbox 22 of the paper machine and (not shown) Siebwasserauffangtröge. Pulp components used in papermaking, such as fresh pulp, secondary pulp and / or rejects, as well as fillers that match with those from the wire section of Paper machine 24 obtained white water are diluted, are introduced through a line 11 in the white water tank 10, in which the screen waters of the paper machine are collected. By a feed pump 12, the pulp suspension is pumped from the white water tank 10 to the centrifugal cleaning system 14. The substance accepted by the first stage of the centrifugal cleaning plant 14 is conveyed by the pressure generated by the feed pump and promoted by the vacuum in the gas separation vessel 16 therein. From the gas separation tank 16, the substantially gas-free pulp suspension, from which gas has been removed as completely as possible by the vacuum device 17, flows to a mixing pump 18, which pumps the pulp suspension to the sorter 20, from where the accepted pulp flows into the head box 22 of the paper machine 24. The gas separation vessel 16 is typically arranged in a plane T above the machine plane K.
  • Fig. 2 shows the scheme of a plant according to the invention. Various pulp components are fed into a mixing tube 1 via lines 2, 2 ', 2 ", which may be, for example, primary material, secondary substance and / or rejects. Dilution water is supplied via line 4, which may be a part of the white water or clear water from a disc filter After all fibers and auxiliaries have been added, the suspension is mixed with a drive motor 6 through a degassing rotor 5 and degassed at the same time. The consistency is determined from the mixed and degassed pulp suspension by means of a consistency measuring device 7 and the flow valve 9 of the dilution water line 4 is regulated by a regulator 8. After the degassing rotor 5, further measuring devices 7 for eg ash content, whiteness or degree of grinding can be arranged, whereby the degassing the readings are very exact and degassed pulp suspension then passes into a machine chest 15. The degassing rotor 5 causes a pressure build-up, which compensates the container height, so that the mixing tube 1 has approximately atmospheric pressure. This is important because here then one Most of the gas or the air is present as bubbles and can be easily removed by the degassing rotor 5. After the machine chest 15, a flow meter 13 is arranged, which controls a flow control valve 23 via a flow regulator 19. The regulation of the flow rate can only be meaningful if it is ensured that the consistency of the flow is constant and corresponds to the intended value. This can be guaranteed by the proposed regulation. After flow measurement 13, the pulp suspension is fed through a headbox pump 18 to the headbox 22 of the paper machine.
  • Fig. 3 shows a variant of the invention with a standpipe 25, which is used instead of the machine chest 15. This standpipe 25, together with the white water container 10, a system of communicating vessels, the liquid surfaces of standpipe 25 and white water tank 10 are at the same height. This results in a self-regulating effect for the inlet. As dilution water 4 here a part of the white water is used.
  • In Fig. 4 a similar variant is shown, wherein here on the one hand almost all the white water 4 'is guided into the mixing tube 1 and then the mixed and degassed suspension is fed directly to the headbox pump 18. As a result, the storage volume of the system is minimized and color and / or grade changes can be carried out in a very short time.
  • Fig. 5 shows a mixing and degassing device according to the invention in detail, in which case a mixing tube 1 is provided, into which a line 4 opens with white water. Several lines 2, 2 ', 2 "open into the mixing tube 1 for the supply of various fibrous components, and conduits 3, 3' are provided for supplying a wide variety of auxiliaries The extracted air from the degassing rotor 5 is removed via a line 28. The degassing rotor 5 becomes are driven by means of a drive 6. Subsequently to the degassing rotor 5 are provided measuring devices 7 for consistency measurement and 7 'for measurement of further material values such as eg ash content, whiteness, freeness .. The mixed and degassed suspension is passed via a pipeline to a container (Bütte) or a feed pump to the headbox of a paper machine. With appropriate design of the degassing rotor 5, the suspension can be performed without further pump directly into a container, wherein the rotor 5 generates a sufficient pressure difference.
  • Fig. 6 shows a further variant of the invention, wherein a premix in the mixing tube 1 and the actual mixing of all material flows through the degassing rotor 5 are separated by a deflection 27. The mixing tube 1, into which dilution water 4 and supply lines 2, 2 ', 2 "open for individual fibrous components, has a deflection 27. Here, too, feed lines 3" are shown for further auxiliaries after the deflection 27 and shortly before the degassing rotor 5, whereby a favorable distribution of the individual substances can be achieved.

Durch die Erfindung lassen sich große Entgasungsbehälter vermeiden, was zu großen Investitionseinsparungen führt. Es lässt sich somit auch ein "short flow" Konzept in einfacher und günstiger Weise realisieren.The invention makes it possible to avoid large degassing tanks, which leads to large investment savings. It can thus also realize a "short flow" concept in a simple and inexpensive way.

Claims (12)

  1. Method for blending pulp flows, particularly in the approach system to a paper machine, where at least two pulp flows are merged in a first process stage and the merged pulp flows are blended with one another and degassed at the same time by a degassing device, particularly by a rotor with degassing openings, in a subsequent second process stage, where dilution water, for example white water from a paper machine, is mixed into the individual pulp flows, and where the consistency of the fibrous pulp suspension is measured after blending and degassing and the quantity of dilution water added depends on the consistency of the blended and degassed pulp suspension.
  2. Method according to Claim 1, characterized by individual fibrous pulp components being blended with one another.
  3. Method according to Claim 1 or 2, characterized by process additives being mixed into the pulp.
  4. Method according to one of Claims 1 to 3, characterized by the entire white water from the paper machine being mixed into the suspension.
  5. Method according to one of Claims 1 to 4, characterized by the blended and degassed suspension being fed to a storage tank, e.g. machine chest, standpipe.
  6. Method according to one of Claims 1 to 4, characterized by the blended and degassed suspension being fed to a pump.
  7. Device for blending pulp flows, particularly in the approach system to a paper machine, where a degassing device (5), particularly a rotor with degassing holes, is provided in a mixing pipe (1), where several pipes (2, 2', 2", 3, 3', 3") for pulp flows, particularly fibrous pulp components, lead into the mixing pipe (1) ahead of the degassing device (5), characterized in that a dilution water pipe (4) leads into the mixing pipe (1) ahead of the degassing device (5) and in that a measuring device (7, 7') for at least one characteristic of the suspension is provided after the degassing device (5), where the measuring device (7) is a consistency meter that is connected via a control device (8) to a valve (9) in the dilution water pipe (4).
  8. Device according to Claim 7, characterized by the white water pipe (4') of a paper machine leading into the mixing pipe (1).
  9. Device according to Claim 7 or 8, characterized by the mixing pipe (1) being connected to a storage tank (15, 25) after the degassing device (5).
  10. Device according to Claim 9, characterized by the storage tank being designed as a standpipe (25).
  11. Device according to Claim 10, characterized by the standpipe (25) forming a communicating system together with the white water tank (10).
  12. Device according to Claims 7 or 8, characterized by the mixing pipe (1) being connected to a pump (18) after the degassing device (5).
EP05009018.2A 2004-05-13 2005-04-25 Method and device for mixing and degasing material flows Ceased EP1595998B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT8302004 2004-05-13
AT0083004A AT414244B (en) 2004-05-13 2004-05-13 METHOD AND DEVICE FOR THE MIXTURE OF SUBSTANCES

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EP1595998B1 true EP1595998B1 (en) 2014-06-11

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EP (1) EP1595998B1 (en)
CN (1) CN100536976C (en)
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DE102009006715A1 (en) * 2009-01-29 2010-08-05 Voith Patent Gmbh broke preparation
DE102013209998A1 (en) * 2013-05-29 2014-05-22 Voith Patent Gmbh Constant part mixer

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Publication number Priority date Publication date Assignee Title
US4219340A (en) 1978-12-14 1980-08-26 Clark & Vicario Corporation Method and apparatus for outflowing liquids from chamber maintained under vacuum
SE8404573D0 (en) * 1984-09-12 1984-09-12 Celleco Ab DEVICE FOR VEGOATION AND MIXING OF THE FLOW
FI87247C (en) 1990-08-14 1992-12-10 Ahlstroem Oy MATNINGSARRANGEMANG OCH -FOERFARANDE FOER EN PAPPERSMASKIN FOER BEHANDLING AV EN FIBERMASSASTROEM
SE501894C2 (en) 1993-10-13 1995-06-12 Kvaerner Pulping Tech Method and apparatus for mixing fluid in a pulp suspension
FI103676B1 (en) * 1998-06-10 1999-08-13 Valmet Corp Process arrangement for the short circulation in a paper or tub machine
FI103678B1 (en) * 1998-06-10 1999-08-13 Valmet Corp A method of controlling the weight of the paper or paperboard in a paper or cardboard machine
EP0969142B1 (en) * 1998-06-29 2004-03-24 Voith Paper Patent GmbH Process and device for mixing stock suspensions
FI116078B (en) * 1998-12-30 2005-09-15 Metso Paper Inc Method of feeding pulp into an inlet box
DE60028988T2 (en) * 1999-09-21 2006-11-09 Metso Paper, Inc. RULE SYSTEM FOR SHORT CIRCULATION AND FIELD RUN IN A PAPER MACHINE OR THE SAME
AT413018B (en) * 2002-03-21 2005-10-15 Andritz Ag Maschf METHOD AND DEVICE FOR PROMOTING FLOWABLE MEDIA
DE20316687U1 (en) * 2003-10-29 2004-01-29 Voith Paper Patent Gmbh Assembly to degas fiber suspensions has a horizontal and cylindrical vessel, with a number of distribution pipes to feed different suspension flows, with outlets for the gas-free suspension and the separated gas, and a surplus overflow

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NO20052154L (en) 2005-11-14
EP1595998A1 (en) 2005-11-16
ATA8302004A (en) 2006-01-15
AT414244B (en) 2006-10-15
CA2505214C (en) 2012-03-13
CN1704141A (en) 2005-12-07
NO20052154D0 (en) 2005-05-02
CA2505214A1 (en) 2005-11-13
US20050269051A1 (en) 2005-12-08
CN100536976C (en) 2009-09-09
US7520961B2 (en) 2009-04-21

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