EP1657356B1 - Method and device for mixing suspensions - Google Patents

Method and device for mixing suspensions Download PDF

Info

Publication number
EP1657356B1
EP1657356B1 EP20050022328 EP05022328A EP1657356B1 EP 1657356 B1 EP1657356 B1 EP 1657356B1 EP 20050022328 EP20050022328 EP 20050022328 EP 05022328 A EP05022328 A EP 05022328A EP 1657356 B1 EP1657356 B1 EP 1657356B1
Authority
EP
European Patent Office
Prior art keywords
mixing
pipe
fed
dilution liquid
pump
Prior art date
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.)
Expired - Fee Related
Application number
EP20050022328
Other languages
German (de)
French (fr)
Other versions
EP1657356A1 (en
Inventor
Elisabeth Bäatz
Erwin Binder
Günther Einetter
Axel Gommel
Reimund Rienecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE200410054236 priority Critical patent/DE102004054236B4/en
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1657356A1 publication Critical patent/EP1657356A1/en
Application granted granted Critical
Publication of EP1657356B1 publication Critical patent/EP1657356B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21DTREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02Straining or screening the pulp
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30Defibrating by other means
    • D21B1/34Kneading or mixing; Pulpers
    • D21B1/342Mixing apparatus

Description

  • Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 sowie eine Mischvorrichtung gemäß dem Oberbegriff des Anspruchs 9.The invention relates to a method according to the preamble of claim 1 and a mixing device according to the preamble of claim 9.
  • Ein solches Verfahren wird zur Hauptsache angewendet, um in der Stoffaufbereitung einer Papierfabrik die Stoffdichte der Faserstoffsuspensionen zu reduzieren. Bekanntlich wird bei Durchführung der meisten Prozessschritte solcher Anlagen eine bestimmte Konsistenz der behandelten Faserstoffsuspension eingestellt, was schon allein deshalb sinnvoll ist, da die optimale Wirkung der Prozessschritte jeweils meist nur mit einer definierten Konsistenz erreichbar ist. In den Fällen, in denen eine Absenkung der Konsistenz durchgeführt werden soll, wird einer dickeren Faserstoffsuspension eine Verdünnungsflüssigkeit, z.B. Rückwasser, zugemischt. Dies geschieht üblicherweise in Zwischenbütten oder mit Hilfe von Pumpen, in denen die zu vermischenden Anteile zusammengeführt werden. Im Falle der Verwendung von Bütten wird in Kauf genommen, dass zusätzliche platzaufwändige Behälter und Pumpen installiert werden müssen. Die im geschlossenen System vorhandene Druckenergie geht beim Einlauf in die Bütte verloren. Bei der Verwendung von Mischpumpen kann es von Nachteil sein, dass der Grad der Durchmischung vom jeweiligen Prozesszustand abhängig ist, z.B. wenn wegen unterschiedlicher Durchsätze unterschiedliche Drehzahlen der Pumpe einzustellen sind. Als Folge davon kann das Mischergebnis uneinheitlich sein. Es ist auch klar, dass jede zusätzliche Pumpe einen zusätzlichen Energiebedarf hat.Such a process is mainly used to reduce the consistency of pulp suspensions in the stock preparation of a paper mill. As is known, when carrying out most of the process steps of such plants, a certain consistency of the treated pulp suspension is set, which is useful for the sole reason that the optimum effect of the process steps can usually only be achieved with a defined consistency. In cases where a reduction in consistency is to be carried out, a thicker pulp suspension is treated with a diluent liquid, e.g. Return water, mixed. This is usually done in Zwischenbütten or with the help of pumps in which the shares to be mixed are brought together. In the case of the use of laid paper is accepted that additional space-consuming containers and pumps must be installed. The pressure energy present in the closed system is lost when entering the chute. When using mixing pumps, it may be disadvantageous that the degree of mixing depends on the respective process state, e.g. if different speeds of rotation of the pump have to be set because of different throughputs. As a result, the mixing result may be uneven. It is also clear that every additional pump has an additional energy requirement.
  • Ein in der DE-A1-41 25 513 beschriebenes Verdünnungsverfahren dieser Art benutzt einen vor der Mischpumpe angebrachten Rohrbogen. In diesem werden ein Dünnstoff mit geringer Konsistenz und ein Dickstoff mit höherer Konsistenz zusammengeführt, wobei die Geschwindigkeit des Dickstoffes mindestens 3 Mal so hoch ist wie die des Dünnstoffes.An Indian DE-A1-41 25 513 The described dilution method of this type uses a pipe bend mounted in front of the mixing pump. In this, a low-consistency thinness and a higher-consistency thickener are brought together, the speed of the high-density material being at least 3 times that of the thinnest.
  • Aus der US 2002/0166645 A1 ist eine Mischvorrichtung für Papierfasersuspensionen bekannt, insbesondere zur Verwendung in der Zuleitung zum Stoffauflauf. Sie ist versehen mit einem inneren Rohr für die eine Komponente und einem äußeren Rohr für eine andere Komponente. Dabei endet das innere Rohr innerhalb des äußeren, so dass stromabwärts die Vermischung erfolgen kann. Diese wird unterstützt durch aufwändige wellenförmige Einbauten.From the US 2002/0166645 A1 a mixing device for paper fiber suspensions is known, in particular for use in the feed line to the headbox. It is provided with an inner tube for one component and an outer tube for another component. In this case, the inner tube ends within the outer, so that the mixing can take place downstream. These is supported by elaborate wave-shaped installations.
  • Die DE 699 15 737 T2 beschreibt ein Verfahren für den Konstanten Teil (approach flow ), das zum Mischen von mehreren Suspensionen mit unterschiedlichen Eigenschaften dient und bei dem ein Mischrohr verwendet wird. In diesem Mischrohr wird als Hauptströmung ein großer Anteil des Siebwassers einer Papiermaschine geführt. Um eine für den Stoffauflauf dieser Papiermaschine geeigneten Faserstoff zu bilden, werden in das Mischrohr weitere Suspensionsströme eingemischt. Diese sind z.B. der aus der Stoffaufbereitung kommende Frischstoff, also eine homogene störstofffreie Faserstoffsuspension. In dieser Publikation wird empfohlen, die der Hauptströmung zugegebenen zusätzlichen Suspensionen in einem Geschwindigkeitsverhältnis zuzugeben, das einem Wert zwischen 3 und 15 entspricht. Bei diesem Stand der Technik werden also die Treibstrahlen mit Suspensionen von relativ hoher Konsistenz gebildet.The DE 699 15 737 T2 describes a method for the approach flow, which is used to mix several suspensions with different properties and in which a mixing tube is used. In this mixing tube, a large portion of the white water of a paper machine is guided as the main flow. In order to form a pulp suitable for the headbox of this paper machine, further suspension streams are mixed into the mixing tube. These are, for example, coming from the stock preparation fresh material, so a homogeneous contaminant-free pulp suspension. In this publication, it is recommended that the additional suspensions added to the mainstream be added at a speed ratio equal to between 3 and 15. In this prior art, therefore, the propulsion jets are formed with suspensions of relatively high consistency.
  • Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der eingangs genannten Art zu schaffen, mit dem es gelingt, eine homogene Stoffdichte im Stoffaufbereitungsprozess unabhängig von Produktions- und Mengenschwankungen zu erreichen. Das Verfahren soll auch bei verstopfungsfördernden Rejekten betriebssicher arbeiten.The invention is based on the object to provide a method of the type mentioned, with which it is possible to achieve a homogeneous consistency in the stock preparation process regardless of production and volume fluctuations. The process should also work reliably in the case of congestion-promoting rejects.
  • Diese Aufgabe wird durch die im Anspruch 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in claim 1.
  • Der Anspruch 9 beschreibt eine vorteilhafte Mischvorrichtung zur Durchführung des Verfahrens.The claim 9 describes an advantageous mixing device for carrying out the method.
  • Mit Hilfe des erfindungsgemäßen Verfahrens ist es möglich, betriebssicher und auf besonders wirtschaftliche Weise eine Verdünnung der in der Stoffaufbereitung einer Papierfabrik geführten Faserstoffsuspension vorzunehmen. Die dabei verwendete Verdünnungsflüssigkeit kann vorzugsweise aus Rückwasser gebildet werden, welches z.B. aus Eindickern in der Stoffaufbereitung oder aus der Siebpartie der Papiermaschine stammt. Solche Rückwasser können direkt eingesetzt oder vorher einer Klärung (Entstoffung) unterzogen werden. Mit dem Verfahren werden die Flüssigkeiten so vermischt, dass weder bewegte, z.B. rotierend angetriebene Rühr- oder Mischorgane, noch ein Pumpenlaufrad die Mischwirkung erhöht, so dass also die Mischenergie aus der Strömungsenergie der zu mischenden Flüssigkeiten stammt. Auf diese Weise wird nicht nur der apparative Aufwand reduziert, sondern auch der Energieeinsatz für Pumpen oder Mischer.With the aid of the method according to the invention, it is possible to carry out a dilution of the pulp suspension guided in the stock preparation of a paper mill in a reliable manner and in a particularly economical manner. The dilution liquid used can preferably be formed from return water, which originates, for example, from thickeners in the stock preparation or from the wire section of the paper machine. Such backwaters can be used directly or previously subjected to clarification (Entstoffung). With the method, the liquids are mixed so that neither moving, eg rotationally driven stirring or mixing elements, nor a pump impeller increases the mixing effect, so that therefore the mixing energy comes from the flow energy of the liquids to be mixed. In this way, not only the expenditure on equipment is reduced, but also the energy used for pumps or mixers.
  • Die zur Durchführung des Verfahrens verwendete Mischvorrichtung kann ein hydraulischer Mischer sein. Beim hydraulischen Mischer wird die Verdünnungsflüssigkeit im Gleichstrom, Kreuzstrom, Gegenstrom oder in einer Kombination dieser Varianten in die dickere Faserstoffsuspension eingegeben. Vorzugsweise ist eine Düse zu verwenden, durch die eine relativ hohe Differenzgeschwindigkeit zwischen der Hauptströmung in der Mischvorrichtung und der Verdünnungsflüssigkeit erzeugt werden kann, z.B. in einem Bereich zwischen 5 und 15 m/sec. Die Verdünnungsflüssigkeit kann in derselben Richtung wie die Hauptströmung zugeführt werden, also in einer Gleichstromschaltung. Gegebenenfalls ist es aber auch sinnvoll, die Verdünnungsflüssigkeit seitlich (Kreuzstrom) oder gegen die Strömungsrichtung der Hauptströmung zuzugeben. Um eine ausreichende Vermischung zu erreichen, ist es in der Regel zweckmäßig, nach dem Zusammenführen der Flüssigkeiten eine gerade Rohrleitungsstrecke vorzusehen, deren Länge mindestens dem Zweifachen, vorzugsweise mindestens dem Fünffachen des Rohrinnendurchmessers entspricht. Wegen der im Rejekt vorhandenen verstopfungsfördernden Stoffe ist die Betriebssicherheit der verwendeten Mischvorrichtung besonders hoch, wenn sich in ihrem Inneren keine zusätzlichen Strömungseinbauten befinden, wie sie z.B. von statischen Mischern bekannt sind.The mixing device used to carry out the method may be a hydraulic mixer. In the hydraulic mixer, the dilution liquid is co-current, cross-flow, Counterflow or in a combination of these variants in the thicker pulp suspension entered. Preferably, a nozzle is to be used by which a relatively high differential speed between the main flow in the mixing device and the dilution liquid can be generated, for example in a range between 5 and 15 m / sec. The dilution liquid may be supplied in the same direction as the main flow, that is, in a DC circuit. Optionally, it is also useful to add the dilution liquid laterally (cross flow) or against the flow direction of the main flow. In order to achieve a sufficient mixing, it is generally expedient to provide, after the merging of the liquids, a straight pipe section whose length corresponds to at least twice, preferably at least five times, the pipe inner diameter. Because of the present in the reject clogging materials, the reliability of the mixing device used is particularly high when there are no additional flow internals in their interior, as they are known, for example, static mixers.
  • Die Erfindung und ihre Vorteile werden erläutert an Hand von schematischen Zeichnungen. Dabei zeigen:
  • Fig. 1
    ein Ausführungsbeispiel in einer mehrstufigen Sortiereranlage einer Papierfabrik;
    Fig. 2
    eine erfindungsgemäße Mischvorrichtung (Mischrohr);
    Fig. 3 + 4
    je eine variierte Form der Mischvorrichtung für das Gleichstromprinzip;
    Fig. 5
    ein Beispiel für das Querstromprinzip;
    Fig. 6
    ein Beispiel für das Gegenstromprinzip;
    Fig. 7
    ein Ausführungsbeispiel einer mehrstufigen Cleaneranlage einer Papierfabrik.
    The invention and its advantages will be explained with reference to schematic drawings. Showing:
    Fig. 1
    an embodiment in a multi-stage sorter plant of a paper mill;
    Fig. 2
    a mixing device according to the invention (mixing tube);
    Fig. 3 + 4
    each a varied form of the mixing device for the DC principle;
    Fig. 5
    an example of the cross-flow principle;
    Fig. 6
    an example of the countercurrent principle;
    Fig. 7
    an embodiment of a multi-stage cleaner system of a paper mill.
  • Eine wichtige Anwendung des erfindungsgemäßen Verfahrens ist die Verdünnung von Stoffströmen in einer mehrstufigen Sortiereranlage einer Papierfabrik. Ein solcher Fall ist in Fig. 2 schematisch dargestellt. Eine Mischvorrichtung 4, hier in Form eines Mischrohres, führt als Hauptströmung eine Faserstoffsuspension 1, deren Konsistenz z.B. in einem Bereich zwischen 2 und 6 % liegt. Die Faserstoffsuspension 1 wird hier aus dem Rejekt eines Drucksortierers 7 gebildet, der in an sich bekannter Weise dazu dient, um mit Hilfe eines Nasssiebvorganges unerwünschte Störstoffe aus einer Faserstoffsuspension auszuscheiden. Der Rejekt, also die mit Störstoffen angereicherte Fraktion, bildet die Faserstoffsuspension 1, die in der Mischvorrichtung 4 verdünnt werden soll und in diese als Hauptströmung eingeführt wird. Dazu wird eine Verdünnungsflüssigkeit 2 (Pfeil mit Hohikopf) mit Hilfe eines Düsenrohres 5 in die Mischvorrichtung 4 eingedüst. Nach dem Zusammenführen der beiden Flüssigkeiten wird die verdünnte Faserstoffsuspension 3 hier in ein gerades zylindrisches Rohrstück 6 eingeführt, deren Länge L hier dem Sechsfachen ihres Durchmessers entspricht. Die verdünnte Faserstoffsuspension 3 gelangt dann direkt, also ohne weitere Pumpe, in den Drucksortierer 8. Dieser ist ein geschlossener Apparat, dessen Innendruck sich vom Umgebungsdruck unterscheidet. In der Regel steht er unter Überdruck von mindestens 1 bar.An important application of the method according to the invention is the dilution of streams in a multi-stage sorter plant of a paper mill. One such case is in Fig. 2 shown schematically. A mixing device 4, here in the form of a mixing tube, carries as mainstream a pulp suspension 1 whose consistency is, for example, in a range between 2 and 6%. The pulp suspension 1 is formed here from the reject of a pressure sorter 7, which serves in a conventional manner to excrete undesirable contaminants from a pulp suspension with the aid of a wet sieving process. The reject, that is enriched with impurities Fraction, forms the pulp suspension 1, which is to be diluted in the mixing device 4 and introduced into this as the main flow. For this purpose, a dilution liquid 2 (arrow with hollow head) is injected into the mixing device 4 with the aid of a nozzle tube 5. After merging the two liquids, the diluted pulp suspension 3 is here introduced into a straight cylindrical pipe section 6, whose length L here corresponds to six times their diameter. The diluted pulp suspension 3 then passes directly into the pressure sorter 8, ie without a further pump. This is a closed apparatus whose internal pressure differs from the ambient pressure. As a rule, it is under overpressure of at least 1 bar.
  • Eine Stoffpumpe 9 dient dazu, die Faserstoffsuspension nacheinander durch beide Drucksortierer 7 und 8 und die dazwischen liegende Mischvorrichtung 4 zu pumpen. Es versteht sich, dass auch die Verdünnungsflüssigkeit 2 mit einem Überdruck in die Mischvorrichtung 4 zugegeben wird, wozu eine hier nicht gezeigte Pumpe verwendet werden kann. Die beiden Drucksortierer 7 und 8 bilden jeweils einen Gutstoff 10 bzw. 11, der zur Papiererzeugung auf der nicht dargestellten Papiermaschine verwendet werden soll. Der Rejekt 12 des zweiten Drucksortierers 8 kann entweder in ein Rejektsystem geführt oder analog der hier gezeigten Schaltung einer weiteren Sortierstufe zugeführt werden.A material pump 9 serves to pump the pulp suspension successively through both pressure screens 7 and 8 and the mixing device 4 located therebetween. It is understood that the dilution liquid 2 is added with an overpressure in the mixing device 4, to which a pump, not shown here can be used. The two pressure graders 7 and 8 each form an accepts 10 and 11, respectively, which is to be used for paper production on the paper machine, not shown. The reject 12 of the second pressure sorter 8 can either be guided into a reject system or supplied to a further sorting stage analogously to the circuit shown here.
  • In Fig. 2 ist ein Beispiel für die Ausgestaltung der erfindungsgemäßen Mischvorrichtung dargestellt. Eine solche Mischvorrichtung wird üblicherweise auch als Mischrohr bezeichnet, da die dem Zusammenführen der Flüssigkeiten nachfolgende Mischstrecke in einem Rohrstück liegt. Man erkennt auf dieser Darstellung, dass die dickere Faserstoffsuspension 1 über einen 90°-Rohrbogen 13 in ein gerades zylindrisches Rohrstück 6 eingeführt wird. An den Rohrbogen 13 ist ein Düsenrohr 5 angeschlossen, welches konzentrisch mit dem zylindrischen Rohrstück 6 angeordnet ist. Es ist aber auch eine exzentrische Lage denkbar. Die Mündung 14 des Düsenrohres 5 liegt innerhalb des Rohrbogens 13 und ist um das Maß 15 zurückversetzt, so dass sie nicht in die Mitte des Stoffstromes hineinragt. Durch dieses Zurückversetzen werden Störungen der Hauptströmung weitestgehend verhindert. Ferner wird die zugegebene Verdünnungsflüssigkeit 2 besser über den ganzen Strömungsquerschnitt im Rohrbogen 13 verteilt. In speziellen Fällen ist es aber auch denkbar, die Mündung 14 bis in die Mitte der Hauptströmung vorzuführen.In Fig. 2 an example of the embodiment of the mixing device according to the invention is shown. Such a mixing device is usually also referred to as a mixing tube, since the merging of the liquids subsequent mixing section is located in a piece of pipe. It can be seen on this diagram that the thicker pulp suspension 1 is introduced via a 90 ° pipe bend 13 in a straight cylindrical pipe section 6. To the pipe bend 13, a nozzle tube 5 is connected, which is arranged concentrically with the cylindrical pipe section 6. But it is also an eccentric situation conceivable. The mouth 14 of the nozzle tube 5 is located within the pipe bend 13 and is set back by the amount 15, so that it does not protrude into the middle of the material flow. This retraction largely prevents disturbances of the main flow. Furthermore, the added dilution liquid 2 is better distributed over the entire flow cross section in the pipe bend 13. In special cases, it is also conceivable to show the mouth 14 to the middle of the main flow.
  • Wie Fig. 3 zeigt, kann das Düsenrohr 5 auch so angeschlossen sein, dass es bündig mit dem Innern der Mischvorrichtung abschließt. Es ist durch Flansche geteilt und enthält im Innern einen Düseneinsatz 16. Gemäß Fig. 4 ist der Düseneinsatz 16' bis an die Mündung 14 vorgezogen und schließt dort bündig mit der Innenkontur der Mischvorrichtung 4 ab. Exemplarisch ist hier eine exzentrische Einführung des Düsenrohres 5 gezeigt (Exzentrizität E).As Fig. 3 shows, the nozzle tube 5 may also be connected so that it is flush with the Inside the mixing device completes. It is divided by flanges and contains a nozzle insert inside 16. According to Fig. 4 is the nozzle insert 16 'pulled forward to the mouth 14 and there is flush with the inner contour of the mixing device 4 from. By way of example, an eccentric introduction of the nozzle tube 5 is shown here (eccentricity E).
  • Die Querschnitte von Düsenrohr 5 und zylindrischem Rohrstück 6 sind so aufeinander abgestimmt, dass sich im vorgesehenen Betrieb der Mischvorrichtung eine deutliche Geschwindigkeitsdifferenz zwischen Verdünnungsflüssigkeit und zu verdünnender Faserstoffsuspension einstellt. Es ist auch denkbar, statt der gezeigten Düsen (reduzierte Querschnitte) durchgehend mit dünneren Rohrleitungen für die Verdünnungsflüssigkeit zu arbeiten. Das würde aber den Druckverlust und damit den Energieverbrauch erhöhen.The cross sections of nozzle tube 5 and cylindrical tube piece 6 are coordinated so that sets a significant difference in speed between dilution liquid and to be diluted pulp suspension in the intended operation of the mixing device. It is also conceivable, instead of the nozzles shown (reduced cross sections) to work continuously with thinner pipes for the dilution liquid. But that would increase the pressure loss and thus the energy consumption.
  • Hydraulische Mischung zur Durchführung des erfindungsgemäßen Verfahrens kann auch durch Querströmungen (Fig. 5) oder Gegenströmungen (Fig. 6) erzeugt werden. Dabei sind Energieaufwand und Mischwirkung aufeinander abzustimmen.Hydraulic mixture for carrying out the method according to the invention can also be achieved by cross flows ( Fig. 5 ) or counterflows ( Fig. 6 ) be generated. In this case, energy consumption and mixing effect are to be coordinated.
  • Ergänzend zu Fig. 1, die die Anwendung der Erfindung in einer mehrstufigen Sortiereranlage darstellt, wird in Fig. 7 eine weitere Möglichkeit gezeigt, nämlich in einer mehrstufigen Cleaneranlage. Auch hier wird oft angestrebt, den Rejekt einer Stufe vor der Einführung in die nächste Stufe zu verdünnen. Die z.B. aus der Stoffaufbereitung als Frischstoff ankommende Faserstoffsuspension 18 wird mittels Stoffpumpe 19 in eine im Normalfall aus vielen parallel betriebenen Cleanern bestehende Cleaneranlage 20 eingepumpt. In an sich bekannter Weise bildet sich dadurch ein von Schwerteilen weitgehend gereinigter Gutstoff 21 sowie ein mit Schwerteilen angereicherter Rejekt, der hier in einer geschlossenen Sammelvorrichtung 22 gesammelt und in die Mischvorrichtung 4 eingeführt wird. Darin erfolgt in der bereits beschriebenen Weise die Verdünnung mit der Verdünnungsflüssigkeit 2. Die so eingestellte Faserstoffsuspension 3 gelangt in eine Cleaneranlage 23, die wiederum ein Rejekt 24 und einen Gutstoff 25 bildet. Der Gutstoff 25 kann entweder vor die erste Cleaneranlage 20 zurückgeführt oder mit dem Gutstoff 21 dieser Anlage vermischt werden. Der oder die Gutstoffe gelangen anschließend z.B. in einen Drucksortierer 26. Es sind weitere konkrete Anwendungen des Verfahrens in der Stoffaufbereitung oder im Konstanten Teil einer Papierfabrik denkbar, und zwar dort, wo mit einfachen Mitteln eine prozessbedingte Reduzierung der Konsistenz der Faserstoffsuspension erzielt werden soll.In addition to Fig. 1 , which illustrates the application of the invention in a multistage sorter plant, is incorporated in Fig. 7 another possibility shown, namely in a multi-stage cleaner system. Again, the goal is often to dilute the reject of one stage before introducing it to the next stage. The pulp suspension 18 arriving, for example, from the stock preparation as a virgin material is pumped by means of a fuel pump 19 into a cleaner system 20 which normally comprises many cleaners operated in parallel. In a manner known per se, this results in a good substance 21, which is largely purified by heavy parts, and a reject, which is enriched with heavy parts, which is here collected in a closed collecting device 22 and introduced into the mixing device 4. Therein, the dilution with the dilution liquid 2 takes place in the manner already described. The thus adjusted pulp suspension 3 passes into a cleaner unit 23, which in turn forms a reject 24 and an accept 25. The accepts 25 can either be returned to the first cleaner 20 or mixed with the accepts 21 of this system. The or the acceptances then pass, for example, in a pressure sorter 26. There are other concrete applications of the process in the stock preparation or in the Constant part of a paper mill conceivable, and there where simple process means a process-related reduction of the consistency of the pulp suspension is to be achieved.

Claims (17)

  1. Method for mixing suspensions of different composition in the stock preparation before a paper or board machine,
    an aqueous dilution liquid (2) being mixed with a thicker fibrous suspension (1),
    the mixing operation being carried out in a closed mixing device (4) without mechanically driven components which assist the mixing operation, and the mixing device (4) used being a mixing pipe having at least two inlets and at least one outlet,
    characterized
    in that the thicker fibrous suspension (1) accumulates in the stock preparation as rejects (12) and is fed in at a lower flow velocity than the aqueous dilution liquid (2), and
    in that the suspension formed in the mixing device (4) is led into the next processing device without using a pump.
  2. Method according to Claim 1, characterized in that the thicker fibrous suspension (1) is fed into the aqueous dilution liquid (2) at a flow velocity which is at least 5 m/sec., preferably at least 10 m/sec., lower than the flow velocity of the aqueous dilution liquid (2).
  3. Method according to Claim 1 or 2, characterized in that, after the mixing of the dilution liquid (2), the flow is led into a straight, preferably cylindrical, section of pipe (6), and in that the length (L) of this straight section of pipe (6) corresponds to at least twice, preferably at least five times, its diameter.
  4. Method according to Claim 3, characterized in that the dilution liquid (2) is put into the flow of the thicker fibrous suspension (1) in a central propulsion jet, the direction of which corresponds to the longitudinal axis of the straight section of pipe (6).
  5. Method according to one of the preceding claims, characterized in that the next processing device is a closed apparatus.
  6. Method according to one of the preceding claims, characterized in that the thicker fibrous suspension (1) is the rejects (12) of a fibrous suspension fed into a pressure screen (7) with the aid of a stock pump (9), in that it is fed into the mixing device (4) without using a further pump, is mixed therein with at least one dilution liquid (2) and is then fed to a further closed apparatus without using a further pump.
  7. Method according to Claim 6, characterized in that the diluted fibrous suspension is fed to a pressure screen (7, 8) without using a further pump (9).
  8. Method according to Claims 1 to 3, characterized in that the thicker fibrous suspension (1) is the rejects (12) of a fibrous suspension fed into a cleaning plant (20) with the aid of a stock pump (19), in that it is fed into the mixing device (4) without using a further pump, is mixed therein with at least one dilution liquid (2) and is then fed to a further cleaning plant (23) without using a further pump.
  9. Mixing device for carrying out the method according to one of the preceding claims, which has at least two inlets and at least one outlet and which, towards the outlet, contains a cylindrical straight section of pipe (6), of which the length (L) corresponds to at least five times its internal diameter,
    characterized
    in that one inlet is formed as a pipe bend (13) for a thicker fibrous suspension (1), connected to the section of pipe (6), and another inlet is formed as a jet pipe (5) for feeding in an aqueous dilution liquid (2), arranged in the same direction as the section of pipe (6).
  10. Mixing device according to Claim 9, characterized in that the mouth (14) of the jet pipe (5) is arranged within the pipe bend (13).
  11. Mixing device according to Claim 9 or 10, characterized in that the mouth (14) of the jet pipe (5) ends flush with the inner wall of the pipe bend (13).
  12. Mixing device according to Claim 9 or 10, characterized in that the dimension (15) which describes the distance of the mouth (14) of the jet pipe (5) from the straight part of the section of pipe (6) corresponds to 20 to 50% of the internal diameter of the section of pipe (6).
  13. Mixing device according to one of Claims 9 to 12, characterized in that the smallest flow cross section of the jet pipe (5) has 20 to 50% of the cross section of the section of pipe (6).
  14. Mixing device according to one of Claims 9 to 13, characterized in that the jet pipe (5) is provided with a jet insert (16, 16').
  15. Mixing device according to one of Claims 9 to 14, characterized in that the internal diameter of the pipe bend (13) is equal to that of the section of pipe (6).
  16. Mixing device according to one of Claims 9 to 15, characterized in that the pipe bend (13) is a 90° pipe bend.
  17. Mixing device according to one of Claims 9 to 16, characterized in that the mixing device is free of additional internal flow fittings in its interior, in particular free of static mixing elements.
EP20050022328 2004-11-10 2005-10-13 Method and device for mixing suspensions Expired - Fee Related EP1657356B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200410054236 DE102004054236B4 (en) 2004-11-10 2004-11-10 Method for mixing suspensions of different compositions

Publications (2)

Publication Number Publication Date
EP1657356A1 EP1657356A1 (en) 2006-05-17
EP1657356B1 true EP1657356B1 (en) 2008-09-03

Family

ID=35782763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050022328 Expired - Fee Related EP1657356B1 (en) 2004-11-10 2005-10-13 Method and device for mixing suspensions

Country Status (5)

Country Link
EP (1) EP1657356B1 (en)
CN (1) CN1773012B (en)
AT (1) AT407256T (en)
DE (2) DE102004054236B4 (en)
ES (1) ES2314537T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT15159U1 (en) * 2014-11-24 2017-01-15 Voith Patent Gmbh Approach flow sorting
CN107949670B (en) * 2015-09-11 2021-03-02 精工爱普生株式会社 Sheet manufacturing apparatus and sheet manufacturing method
SE1650410A1 (en) * 2016-03-30 2017-10-01 Valmet Oy Screen feed arrangement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1561697A1 (en) * 1967-04-15 1970-10-01 Voith Gmbh J M Process for the continuous dilution and / or mixing of long, spinning-prone fibers containing suspensions and apparatus for carrying out this process
US3839145A (en) * 1970-09-17 1974-10-01 K Bueckle Apparatus for and method of forming a fiber suspension and for delivering it to the wire of a machine for manufacturing non-woven materials
DE4125513A1 (en) * 1991-08-01 1993-02-04 Escher Wyss Gmbh Fibre suspension mixing - introduces thick suspension into centre of thin suspension flow at a faster speed with turbulence
FI104384B (en) * 1998-06-05 2000-01-14 Valmet Corp Apparatus and Method for Mixing Freshwater and Fresh Mass in a Post-Wastewater Canal
DE19859770A1 (en) * 1998-06-29 1999-12-30 Voith Sulzer Papiertech Patent Method and device for mixing suspension of substances
AT262611T (en) * 1998-06-29 2004-04-15 Voith Paper Patent Gmbh METHOD AND DEVICE FOR MEASURING FIBER FIBER SUSPENSIONS
DE10050109A1 (en) * 2000-10-09 2002-04-11 Voith Paper Patent Gmbh Preparation of a fiber suspension, as paper/cardboard pulp, has a mixing pipe for the main mixed suspension flow with an elbow where an additional suspension is injected with a bulking agent
FI111391B (en) * 2001-04-23 2003-07-15 Metso Paper Inc Process and process arrangement in the short circulation of a paper machine

Also Published As

Publication number Publication date
DE502005005250D1 (en) 2008-10-16
AT407256T (en) 2008-09-15
ES2314537T3 (en) 2009-03-16
EP1657356A1 (en) 2006-05-17
DE102004054236A1 (en) 2006-05-18
CN1773012B (en) 2012-01-18
DE102004054236B4 (en) 2007-06-06
CN1773012A (en) 2006-05-17

Similar Documents

Publication Publication Date Title
DE69934611T2 (en) Method and device for feeding a chemical into a liquid flow
DE60311261T3 (en) MULTI-STAGE SORTING PLANT AND SORTING BASKET FOR FIBROUS SUSPENSIONS
DE4496222C2 (en) Method and pressure sorter for sorting a fiber suspension
CH637433A5 (en) METHOD AND SYSTEM FOR THE PROCESSING OF WASTE PAPER.
EP1467018A1 (en) Device and method for mixing a liquid into a fibrous suspension
DE102004045823A1 (en) Process for fractionating an aqueous paper fiber suspension and hydrocyclone for carrying out the process
EP1069234A1 (en) Method and device for removing impurities from a hydrocyclone
EP1657356B1 (en) Method and device for mixing suspensions
DE2712763C2 (en)
DE19859770A1 (en) Method and device for mixing suspension of substances
DE102005045591A1 (en) Raw material e.g. granular material, separating device for use in grinding plant, has static separator with aeration base through which gas flows, where base is arranged in vertical direction and has specific ratio of breadth to height
DE10337944A1 (en) Process to remove gas from fibrous suspension in paper or carton manufacturing assembly
DE4125513A1 (en) Fibre suspension mixing - introduces thick suspension into centre of thin suspension flow at a faster speed with turbulence
DE102005016192A1 (en) Process for dissolving and cleaning contaminant-containing paper tubes
WO2012013407A1 (en) Approach system of a machine for producing a fibrous web
DE102009019664A1 (en) Process for treating a pulp suspension and screening device for its implementation
EP0194332A1 (en) Process and apparatus for sorting a fibre suspension
DE19805448C2 (en) Method and device for cleaning and feeding a paper stock suspension into the headbox of a paper machine
DE102009028405A1 (en) Method involves providing high consistency fiber suspension in stock preparation before machine for producing and finishing paper, cardboard, tissue or other fibrous web
EP1462567B1 (en) Screen for purification of fibrous pulp
DE102004039712B4 (en) Reject flow control, from a used paper suspension sorting station, has a flow measurement point in front of a throttle linked to a control to set the delivery of a diluting fluid to prevent throttle blockages
EP1860231A2 (en) Method and device for cleaning paper raw materials containing impurities
DE60118178T2 (en) METHOD AND APPARATUS FOR GUIDING THE CLEANED FIBER BREAK TO A CONTROLLED OUTPUT
EP1876289A1 (en) Method for separating impurities from a fibrous suspension
DE19909379C2 (en) Arrangement on paper machines for setting the basis weight cross section with dilution water

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: VOITH PATENT GMBH

17P Request for examination filed

Effective date: 20061117

17Q First examination report despatched

Effective date: 20061215

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REF Corresponds to:

Ref document number: 502005005250

Country of ref document: DE

Date of ref document: 20081016

Kind code of ref document: P

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2314537

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

BERE Be: lapsed

Owner name: VOITH PATENT G.M.B.H.

Effective date: 20081031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090203

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090103

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081031

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

26N No opposition filed

Effective date: 20090604

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081013

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20090304

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20080903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20081204

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20121023

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20121019

Year of fee payment: 8

Ref country code: ES

Payment date: 20121026

Year of fee payment: 8

Ref country code: SE

Payment date: 20121019

Year of fee payment: 8

Ref country code: IT

Payment date: 20121024

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20121019

Year of fee payment: 8

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20140501

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20131013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131031

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131013

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140501

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131013

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131014

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20141107

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131014

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FI

Payment date: 20151013

Year of fee payment: 11

Ref country code: DE

Payment date: 20151022

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20151023

Year of fee payment: 11

Ref country code: AT

Payment date: 20151022

Year of fee payment: 11

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502005005250

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 407256

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161013

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161013

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170503

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161102

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161013