EP1749923B1 - Apparatus for treating a fibrous suspension - Google Patents

Apparatus for treating a fibrous suspension Download PDF

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Publication number
EP1749923B1
EP1749923B1 EP06010158A EP06010158A EP1749923B1 EP 1749923 B1 EP1749923 B1 EP 1749923B1 EP 06010158 A EP06010158 A EP 06010158A EP 06010158 A EP06010158 A EP 06010158A EP 1749923 B1 EP1749923 B1 EP 1749923B1
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EP
European Patent Office
Prior art keywords
housing
fibrous suspension
rotor
guide element
guide vanes
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EP06010158A
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German (de)
French (fr)
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EP1749923A1 (en
Inventor
Erwin Binder
Axel Gommel
Anton Selbherr
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Voith Patent GmbH
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Voith Patent GmbH
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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

Definitions

  • the invention relates to an apparatus according to the preamble of claim 1.
  • the paper pulp required for paper production is first treated on the paper machine in the so-called stock preparation.
  • the fibers are treated and processed in suspension, in particular an aqueous suspension, with a fiber content of between 0.5 and 8%.
  • a large part of these process steps is carried out in closed apparatuses, which therefore belong to a closed system.
  • Apparatuses of the kind mentioned in the introduction can e.g. Pressure sorters in which - as known per se - the pulp suspension to be treated by means of an applied pressure difference through a wet sieve, e.g. a screen cylinder, also called screen basket, is pumped through.
  • a wet sieve e.g. a screen cylinder, also called screen basket
  • a part of the pulp suspension is rejected at the openings of the screen and removed through a separate opening from the housing.
  • a rotor is moved close to it.
  • Apparatus of this type can also be designed so that they serve for venting or degassing of the pulp suspension.
  • the suspension is set into rapid rotation with the aid of the rotor, whereby gases - in particular air - accumulate in the center as a result of the centrifugal forces occurring in the process and then removed through a suitable opening.
  • Bleeding apparatus of this type are suitable for replacing expensive vacuum-operated degassing tanks. They can be arranged with particular advantage directly in front of a pressure-increasing material pump, which further promotes the suspension to the next treatment stage.
  • the drive power used to drive the rotor is of course a cost factor in the operation of such an apparatus.
  • the pressure energy originating from the upstream pump is converted into kinetic energy with little loss. Disturbing and energy-consuming vortices are largely avoided or at least reduced.
  • a drum-shaped rotor 2 is arranged, the interior of which is supplied with a liquid to be degassed, in particular a paper fiber suspension S. It serves to put the inflowing pulp suspension S in a rotational flow.
  • the housing 1 of this apparatus has a rotationally symmetrical, in this case cylindrical part, in which the rotor 2 is arranged concentrically. From the inlet 4, which opens here in the center of the housing 1, the added liquid passes radially outward flowing through a hydraulically acting guide element 3.
  • This is typically constructed annularly and also arranged concentrically with the rotor 2. It has several blades and is closed at the bottom, so that form 6 channels 5 between the blades. These direct the flowed-in fiber suspension radially outward and put them in rotation, whose sense of rotation is equal to the rotational flow generated by the rotor 2.
  • the effect of the rotor 2 can be enhanced by co-rotating blades or entrainment bars 12 mounted therein.
  • the liquid is applied to the inner wall of the rotor 2, wherein the gas contained therein 7, in particular the air, migrates radially inwards.
  • a separation surface between the liquid and the gas forms 7.
  • the gas 7 can be removed or sucked.
  • the Operating conditions are controlled so that a continuous flow of liquid from the inlet 4 to the outlet 10 is formed.
  • the wall is designed to be liquid-permeable in the region of the outlet 10, e.g. by attaching openings 11 in this area.
  • the outlet 10 is advantageously attached tangentially, in such a way that the rotational flow of the liquid degassed at this point causes a pressure build-up in the outlet 10.
  • the openings 11 in the wall of the rotor 2 are so large that they do not lead to a sorting of the degassed liquid, so can not form Feststoffrejekt.
  • the in Fig. 1 Apparatus shown can also be used to remove light dirt from a pulp suspension S.
  • a proportion of such impurities for example plastic foam particles ("polystyrene"), which accumulates centrally due to the centrifugal forces, can be contained in particular in the treatment of waste paper. It can then be deducted by a suitably designed lightweight exhaust pipe, which is the same or similar to the degassing 8 of the Fig. 1 ,
  • Fig. 2 shows the upper part of a venting device according to the invention in top view.
  • the guide element 3 contains an annularly designed guide element 3 in which a total of eight guide vanes 6 are located, which have essentially planar guide surfaces.
  • these guide vanes 6 are inclined relative to the radius.
  • the guide element is closed by a top wall 13 and an opposite bottom wall 14, such as the 3 and 4 make clear. Between the top wall 13 and the bottom wall 14 are located the guide vanes 6. It is possible to perform top wall 13 and bottom wall 14 as a plane parallel coaxial disks, of course, the top wall 13 must be provided with a central passage opening 15 for the inflowing suspension. Will - as in Fig. 4 shown - the top wall 13 (or in other cases, the bottom wall 14) provided with a curved inner contour, this leads to the fact that the distance to the opposite wall and thus the height of the flow channels 5 decreases towards the outside. This has the advantage that during operation of the apparatus, the flow velocity does not decrease radially from the inside to the outside too much or may even be increased.
  • the guide vanes 6 'of the guide element 3' (see Fig. 5 ) curved to thereby prevent unwanted eddies.
  • this illustration shows in Fig. 5 in that the thickness of the guide vanes 6 'of the guide element 3' increases towards the outside, with the advantage of a decrease in the flow cross-section. This aspect has already been discussed.
  • a further advantageous embodiment of the invention is a Drucksortierer, as shown in the Fig. 6 is shown by an example. It has a sieve 17, for example a sieve basket, in order, for example, to retain contaminants from the suspension, which can then be removed from the housing 1 'by a reject outlet 18.
  • a pressure sorter used in paper production have already been explained in the introduction. Even with such an apparatus can be made by application of the invention, in particular by the use of a suitable guide element 3, a particularly low-loss implementation of hydraulic pressure energy in kinetic energy.
  • a relative speed between the rotor and the suspension is generally desirable in order to obtain the clearing action of the rotor.
  • the invention can offer advantages here, in particular if an increased separation of air and / or light parts is to be achieved. Disturbing eddies when accelerating the suspension through the rotor can be avoided.
  • the feed of the suspension to be sorted is not carried out centrally, but tangentially or radially (see, for example, US Pat 6 and 7 ).
  • the guide element 3 can be used in cooperation with an outer annular channel 16, said annular channel 16 may be substantially rotationally symmetrical to the center of the sorter or as a spiral housing, as it is known, for example, in the discharge side of centrifugal pumps.

Description

Die Erfindung betrifft einen Apparat gemäß dem Oberbegriff des Anspruchs 1.The invention relates to an apparatus according to the preamble of claim 1.

Bekanntlich wird der zur Papiererzeugung benötigte Papierfaserstoff zunächst auf der Papiermaschine in der sogenannten Stoffaufbereitung behandelt. Bei einer Mehrzahl der in diesem Anlagenteil der Papierfabrik durchzuführenden Prozessschritte werden die Fasern in Suspension, insbesondere einer wässrigen Suspension, mit einem Fasergehalt zwischen 0,5 und 8 % behandelt und bearbeitet. Ein Großteil dieser Prozessschritte wird in geschlossenen Apparaten, die also einem geschlossenen System angehören, durchgeführt.As is known, the paper pulp required for paper production is first treated on the paper machine in the so-called stock preparation. In a majority of the process steps to be carried out in this plant section of the paper mill, the fibers are treated and processed in suspension, in particular an aqueous suspension, with a fiber content of between 0.5 and 8%. A large part of these process steps is carried out in closed apparatuses, which therefore belong to a closed system.

Apparate der eingangs genannten Art können z.B. Drucksortierer sein, bei denen - wie an sich bekannt - die zu behandelnde Faserstoffsuspension mit Hilfe einer anliegenden Druckdifferenz durch ein Nasssieb, z.B. einen Siebzylinder, auch Siebkorb genannt, hindurchgepumpt wird. Dabei wird ein Teil der Faserstoffsuspension an den Öffnungen des Siebes abgewiesen und durch eine separate Öffnung aus dem Gehäuse entfernt. Um zu verhindern, dass das Sieb durch Fasern oder abgewiesene Störstoffe verstopft, wird ein Rotor dicht an diesem vorbei bewegt.Apparatuses of the kind mentioned in the introduction can e.g. Pressure sorters in which - as known per se - the pulp suspension to be treated by means of an applied pressure difference through a wet sieve, e.g. a screen cylinder, also called screen basket, is pumped through. In this case, a part of the pulp suspension is rejected at the openings of the screen and removed through a separate opening from the housing. In order to prevent the sieve from being clogged by fibers or rejected contaminants, a rotor is moved close to it.

Aus den Publikationen D1 102 33 364 C1 und EP-A1-1 215 335 sind Drucksortierer bekannt, bei denen die zugeführte Suspensionsströmung nach dem Eintritt in das Gehäuse von einem mit Öffnungen versehenen Rotor erfasst und nach dem Passieren der Öffnungen gegen feststehende Statorelemente gedrückt werden.From the publications D1 102 33 364 C1 and EP-A1-1 215 335 Pressure sorters are known in which the supplied suspension flow is detected after entering the housing of an apertured rotor and pressed after passing through the openings against fixed stator elements.

Apparate dieser Art können auch so gestaltet sein, dass sie zur Entlüftung bzw. Entgasung der Faserstoffsuspension dienen. Dabei wird mit Hilfe des Rotors die Suspension in eine schnelle Rotation versetzt, wodurch sich infolge der dabei auftretenden Zentrifugalkräfte Gase - insbesondere Luft - im Zentrum anreichern und dann durch eine geeignete Öffnung entfernt werden. Entlüftungsapparate dieser Art sind geeignet, aufwändige vakuumbetriebene Entgasungsbehälter zu ersetzen. Sie können mit besonderem Vorteil direkt vor einer druckerhöhenden Stoffpumpe angeordnet sein, die die Suspension zur nächsten Behandlungsstufe weiterfördert.Apparatus of this type can also be designed so that they serve for venting or degassing of the pulp suspension. In this case, the suspension is set into rapid rotation with the aid of the rotor, whereby gases - in particular air - accumulate in the center as a result of the centrifugal forces occurring in the process and then removed through a suitable opening. Bleeding apparatus of this type are suitable for replacing expensive vacuum-operated degassing tanks. They can be arranged with particular advantage directly in front of a pressure-increasing material pump, which further promotes the suspension to the next treatment stage.

Die zum Antrieb des Rotors eingesetzte Antriebsleistung ist selbstverständlich ein Kostenfaktor beim Betrieb eines solchen Apparates.The drive power used to drive the rotor is of course a cost factor in the operation of such an apparatus.

Es ist Aufgabe dieser Erfindung, Apparate der oben genannten Art so zu verbessern, dass der zum Antrieb erforderliche Energiebedarf sinkt, ohne dass dadurch nachteilige Folgen für den gewünschten Effekt des Apparates eintreten.It is an object of this invention to improve apparatuses of the above-mentioned type so that the energy required for the drive decreases, without thereby adversely affecting the desired effect of the apparatus occur.

Diese Aufgabe wird an einem Apparat gemäß dem Oberbegriff des Anspruchs 1 durch die im Kennzeichen dieses Anspruchs genannten Merkmale gelöst.This object is achieved on an apparatus according to the preamble of claim 1 by the features mentioned in the characterizing part of this claim.

Die genannten Maßnahmen tragen wesentlich dazu bei, Apparate, die zur Faserstoffbehandlung bestimmt sind, hydraulisch zu optimieren. Dabei ist nicht an Pumpen oder Turbinen gedacht, die bekanntlich seit langem unter rein hydraulischen Gesichtspunkten gestaltet werden, bei denen also die Optimierung des energetischen Wirkungsgrades Tradition hat.The measures mentioned contribute significantly to hydraulically optimize apparatuses intended for pulp treatment. It is not intended for pumps or turbines, which are known to have been designed for a long time under purely hydraulic aspects, so where the optimization of energy efficiency has tradition.

Bei der Erfindung wird die von der vorgeschalteten Pumpe stammende Druckenergie verlustarm in Bewegungsenergie umgewandelt. Störende und Energie verzehrende Wirbel werden weitgehend vermieden oder zumindest reduziert.In the invention, the pressure energy originating from the upstream pump is converted into kinetic energy with little loss. Disturbing and energy-consuming vortices are largely avoided or at least reduced.

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

Figur 1:
Einen Entlüftungsapparat als Beispiel für die Erfindung;
Figur 2:
Eine andere Ansicht auf einen ähnlichen Apparat wie in Fig. 1 dargestellt;
Fig. 3+4:
zwei verschiedene Ausführungsformen von erfindungsgemäßen Leitelementen;
Fig. 5
einen erfindungsgemäßen Entlüftungsapparat mit einem variierten Leitelement;
Fig. 6
einen erfindungsgemäß ausgestalteten Drucksortierer, Ansicht von oben;
Fig. 7
einen dem der Fig. 6 ähnlichen Drucksortierer in Seitenansicht.
The invention and its advantages will be explained with reference to drawings. Showing:
FIG. 1:
A venting apparatus as an example of the invention;
FIG. 2:
Another view on a similar apparatus as in Fig. 1 shown;
Fig. 3 + 4:
two different embodiments of guide elements according to the invention;
Fig. 5
a venting device according to the invention with a varied guide element;
Fig. 6
an inventively designed pressure sorter, top view;
Fig. 7
a the the Fig. 6 similar pressure sorter in side view.

Die in Fig. 1 gezeigte Ausführungsform für einen erfindungsgemäßen Apparat dient als Entlüftungsapparat. Diese Darstellung enthält zwar keine konstruktiven Details, macht aber die Funktion eines solchen Apparates ausreichend deutlich. In einem feststehenden Gehäuse 1 ist ein trommelförmiger Rotor 2 angeordnet, dessen Innenraum mit einer zu entgasenden Flüssigkeit, insbesondere einer Papierfasersuspension S, versorgt wird. Er dient dazu, die eingeströmte Faserstoffsuspension S in eine Rotationsströmung zu versetzen. Das Gehäuse 1 dieses Apparates weist einen rotationssymmetrischen, in diesem Falle zylindrischen Teil auf, in dem der Rotor 2 konzentrisch angeordnet ist. Aus dem Einlauf 4, der hier im Zentrum des Gehäuses 1 mündet, gelangt die zugegebene Flüssigkeit radial nach außen strömend durch ein hydraulisch wirkendes Leitelement 3. Dieses ist typischerweise ringförmig aufgebaut und ebenfalls konzentrisch mit dem Rotor 2 angeordnet. Es weist mehrere Schaufeln auf und ist unten geschlossen, so dass sich zwischen den Schaufeln 6 Kanäle 5 bilden. Diese leiten die eingeströmte Fasersuspension radial nach außen und versetzen sie dabei in Rotation, deren Drehsinn gleich dem der durch den Rotor 2 erzeugten Rotationsströmung ist. Die Wirkung des Rotors 2 kann durch darin angebrachte mitrotierende Schaufeln oder Mitnehmerleisten 12 verstärkt werden.In the Fig. 1 embodiment shown for an apparatus according to the invention serves as a venting apparatus. Although this illustration contains no design details, but makes the function of such an apparatus sufficiently clear. In a stationary housing 1, a drum-shaped rotor 2 is arranged, the interior of which is supplied with a liquid to be degassed, in particular a paper fiber suspension S. It serves to put the inflowing pulp suspension S in a rotational flow. The housing 1 of this apparatus has a rotationally symmetrical, in this case cylindrical part, in which the rotor 2 is arranged concentrically. From the inlet 4, which opens here in the center of the housing 1, the added liquid passes radially outward flowing through a hydraulically acting guide element 3. This is typically constructed annularly and also arranged concentrically with the rotor 2. It has several blades and is closed at the bottom, so that form 6 channels 5 between the blades. These direct the flowed-in fiber suspension radially outward and put them in rotation, whose sense of rotation is equal to the rotational flow generated by the rotor 2. The effect of the rotor 2 can be enhanced by co-rotating blades or entrainment bars 12 mounted therein.

In Folge der Zentrifugalkräfte legt sich die Flüssigkeit an die Innenwand des Rotors 2 an, wobei das darin enthaltene Gas 7, insbesondere die Luft, radial nach innen abwandert. In der Regel bildet sich eine Trennfläche zwischen der Flüssigkeit und dem Gas 7. Durch ein zentrales Entgasungsrohr 8 kann das Gas 7 abgeführt bzw. abgesaugt werden. Bei kontinuierlichem Betrieb dieser Entgasungsvorrichtung können z.B. durch eine Eingangsdrossel 9 die Betriebsverhältnisse so geregelt werden, dass sich ein stetiger Flüssigkeitsstrom vom Einlauf 4 zum Auslauf 10 bildet.As a result of the centrifugal forces, the liquid is applied to the inner wall of the rotor 2, wherein the gas contained therein 7, in particular the air, migrates radially inwards. In general, a separation surface between the liquid and the gas forms 7. By a central degassing 8, the gas 7 can be removed or sucked. During continuous operation of this degassing, for example, by an input throttle 9 the Operating conditions are controlled so that a continuous flow of liquid from the inlet 4 to the outlet 10 is formed.

Beim trommelförmigen Rotor 2 ist hier im Bereich des Auslaufs 10 die Wand flüssigkeitsdurchlässig ausgeführt, z.B. durch Anbringung von Öffnungen 11 in diesem Bereich. Der Auslauf 10 ist mit Vorteil tangential angebracht, in der Weise, dass die Rotationsströmung der an dieser Stelle entgasten Flüssigkeit einen Druckaufbau im Auslauf 10 herbeiführt. Die Öffnungen 11 in der Wand des Rotors 2 sind so groß, dass sie nicht zu einer Sortierung der entgasten Flüssigkeit führen, also keinen Feststoffrejekt bilden können.In the case of the drum-shaped rotor 2, the wall is designed to be liquid-permeable in the region of the outlet 10, e.g. by attaching openings 11 in this area. The outlet 10 is advantageously attached tangentially, in such a way that the rotational flow of the liquid degassed at this point causes a pressure build-up in the outlet 10. The openings 11 in the wall of the rotor 2 are so large that they do not lead to a sorting of the degassed liquid, so can not form Feststoffrejekt.

Der in Fig. 1 gezeigte Apparat kann auch zur Entfernung von Leichtschmutz aus einer Faserstoffsuspension S eingesetzt werden. Bekanntlich kann insbesondere bei der Aufbereitung von Altpapier ein Anteil von solchen Störstoffen, z.B. Schaumstoffteilchen aus Kunststoff ("Styropor") enthalten sein, der sich auf Grund der Zentrifugalkräfte zentral ansammelt. Er lässt sich dann durch ein entsprechend gestaltetes Leichtstoffabzugsrohr abziehen, das gleich ist oder ähnlich dem Entgasungsrohr 8 der Fig. 1.The in Fig. 1 Apparatus shown can also be used to remove light dirt from a pulp suspension S. As is known, a proportion of such impurities, for example plastic foam particles ("polystyrene"), which accumulates centrally due to the centrifugal forces, can be contained in particular in the treatment of waste paper. It can then be deducted by a suitably designed lightweight exhaust pipe, which is the same or similar to the degassing 8 of the Fig. 1 ,

Fig. 2 zeigt den oberen Teil eines erfindungsgemäßen Entlüftungsapparates in Ansicht von oben. Das Leitelement 3 enthält gemäß dieser Darstellung ein ringförmig gestaltetes Leitelement 3, in dem sich hier insgesamt acht Leitschaufeln 6 befinden, die im Wesentlichen ebene Leitflächen haben. Um den gewünschten Zweck erfüllen zu können, nämlich die einströmende Faserstoffsuspension in Rotation zu versetzen, sind diese Leitschaufeln 6 schräg gegenüber dem Radius angestellt. Zwischen den Leitschaufeln 6 liegen die Kanäle 5, durch die die einströmende Suspension S radial nach außen geführt und dabei in Rotation versetzt wird. Fig. 2 shows the upper part of a venting device according to the invention in top view. According to this illustration, the guide element 3 contains an annularly designed guide element 3 in which a total of eight guide vanes 6 are located, which have essentially planar guide surfaces. In order to be able to fulfill the desired purpose, namely to set the inflowing pulp suspension in rotation, these guide vanes 6 are inclined relative to the radius. Between the guide vanes 6 are the channels 5, through which the inflowing suspension S is guided radially outwards and thereby set in rotation.

Das Leitelement ist durch eine Oberwand 13 und eine gegenüber liegende Unterwand 14 abgeschlossen, wie z.B. die Fig. 3 und 4 deutlich machen. Zwischen der Oberwand 13 und der Unterwand 14 befinden sich die Leitschaufeln 6. Es ist möglich, Oberwand 13 und Unterwand 14 als ebene parallele koaxiale Scheiben auszuführen, wobei natürlich die Oberwand 13 mit einer zentralen Durchlassöffnung 15 für die zuströmende Suspension versehen sein muss. Wird - wie in Fig. 4 gezeigt - die Oberwand 13 (oder in anderen Fällen die Unterwand 14) mit einer gewölbten Innenkontur versehen, so führt das dazu, dass sich der Abstand zur gegenüber liegenden Wand und damit auch die Höhe der Strömungskanäle 5 nach außen hin verkleinert. Das hat den Vorteil, dass bei Betrieb des Apparates die Strömungsgeschwindigkeit radial von innen nach außen nicht zu sehr abnimmt oder eventuell sogar vergrößert wird.The guide element is closed by a top wall 13 and an opposite bottom wall 14, such as the 3 and 4 make clear. Between the top wall 13 and the bottom wall 14 are located the guide vanes 6. It is possible to perform top wall 13 and bottom wall 14 as a plane parallel coaxial disks, of course, the top wall 13 must be provided with a central passage opening 15 for the inflowing suspension. Will - as in Fig. 4 shown - the top wall 13 (or in other cases, the bottom wall 14) provided with a curved inner contour, this leads to the fact that the distance to the opposite wall and thus the height of the flow channels 5 decreases towards the outside. This has the advantage that during operation of the apparatus, the flow velocity does not decrease radially from the inside to the outside too much or may even be increased.

Es kann weitere Vorteile bringen, die Leitschaufeln 6' des Leitelementes 3' (siehe Fig. 5) gekrümmt auszuführen, um dadurch unerwünschte Wirbel zu verhindern. Außerdem zeigt diese Darstellung in Fig. 5, dass die Dicke der Leitschaufeln 6' des Leitelementes 3' nach außen hin zunimmt, mit dem Vorteil einer Abnahme des Strömungsquerschnittes. Auf diesen Aspekt wurde bereits eingegangen.It may bring further advantages, the guide vanes 6 'of the guide element 3' (see Fig. 5 ) curved to thereby prevent unwanted eddies. In addition, this illustration shows in Fig. 5 in that the thickness of the guide vanes 6 'of the guide element 3' increases towards the outside, with the advantage of a decrease in the flow cross-section. This aspect has already been discussed.

Eine weitere vorteilhafte Ausführungsform der Erfindung stellt ein Drucksortierer dar, wie er in der Fig. 6 an einem Beispiel gezeigt wird. Er weist ein Sieb 17, z.B. einen Siebkorb, auf, um z.B. Störstoffe aus der Suspension zurückzuhalten, die dann durch einen Rejektauslass 18 aus dem Gehäuse 1' entfernt werden können. Die Funktionen eines solchen bei der Papiererzeugung eingesetzten Drucksortierers wurden bereits eingangs erläutert. Auch bei einem solchen Apparat kann durch Anwendung der Erfindung, insbesondere durch den Einsatz eines geeigneten Leitelementes 3 eine besonders verlustarme Umsetzung von hydraulischer Druckenergie in Bewegungsenergie vorgenommen werden. Dazu ist anzumerken, dass bei Drucksortierern eine Relativgeschwindigkeit zwischen Rotor und Suspension im Allgemeinen erwünscht ist, um die Räumwirkung des Rotors zu erhalten. Dennoch kann die Erfindung hier Vorteile bieten, insbesondere wenn eine erhöhte Luft- und/oder Leichtteilabscheidung erreicht werden soll. Störende Wirbel beim Beschleunigen der Suspension durch den Rotor können vermieden werden.A further advantageous embodiment of the invention is a Drucksortierer, as shown in the Fig. 6 is shown by an example. It has a sieve 17, for example a sieve basket, in order, for example, to retain contaminants from the suspension, which can then be removed from the housing 1 'by a reject outlet 18. The functions of such a pressure sorter used in paper production have already been explained in the introduction. Even with such an apparatus can be made by application of the invention, in particular by the use of a suitable guide element 3, a particularly low-loss implementation of hydraulic pressure energy in kinetic energy. It should be noted that in the case of pressure sorters, a relative speed between the rotor and the suspension is generally desirable in order to obtain the clearing action of the rotor. Nevertheless, the invention can offer advantages here, in particular if an increased separation of air and / or light parts is to be achieved. Disturbing eddies when accelerating the suspension through the rotor can be avoided.

In den Fällen, bei denen der Zulauf in das Gehäuse des Drucksortierers zentral angeordnet ist, kann ähnlich vorgegangen werden, wie es bereits an Beispielen des Entlüftungsapparates (Fig. 1 bis 5) gezeigt wurde.In cases where the inlet is arranged centrally in the housing of the pressure sorter, the procedure may be similar, as already described in examples of the deaeration apparatus (US Pat. Fig. 1 to 5 ) was shown.

Bei anderen Drucksortierern erfolgt der Zulauf der zu sortierenden Suspension jedoch nicht zentral, sondern tangential oder radial (siehe z.B. Fig. 6 und 7). In solchen Fällen kann das Leitelement 3 im Zusammenwirken mit einem außen liegenden Ringkanal 16 eingesetzt werden, wobei dieser Ringkanal 16 im Wesentlichen rotationssymmetrisch zum Zentrum des Sortierers ausgebildet sein kann oder als Spiralgehäuse, wie es z.B. beim druckseitigen Auslauf von Kreiselpumpen bekannt ist.In other pressure graders, however, the feed of the suspension to be sorted is not carried out centrally, but tangentially or radially (see, for example, US Pat 6 and 7 ). In such cases, the guide element 3 can be used in cooperation with an outer annular channel 16, said annular channel 16 may be substantially rotationally symmetrical to the center of the sorter or as a spiral housing, as it is known, for example, in the discharge side of centrifugal pumps.

Claims (19)

  1. Apparatus, in particular de-aeration apparatus, cleaning apparatus or pressure screen, for treating a fibrous suspension (S), having a closed housing (1, 1') which has at least one feed (4) for the fibrous suspension (S) to be led into the housing and
    at least one discharge (10) for the fibrous suspension to be led out of the housing (1, 1'), and
    at least one centrally arranged rotor (2), which is suitable to impart a rotational flow to at least some of the fibrous suspension (S) led into the housing (1),
    there being in the housing (1, 1') at least one hydraulically acting guide element (3, 3'), which has a plurality of guide vanes (6, 6') set at an angle with respect to the radius of the guide element,
    the guide element (3, 3') being suitable to set the fibrous suspension (S) flowing into the housing (1) through the feed (4) rotating in such a way that the direction of this rotation corresponds to the direction of the rotational flow generated by the rotor (2),
    characterized in that
    the guide element (3) is sealed off by an upper wall (13, 13') and an opposite lower wall (14), and the guide vanes (6, 6') are located between upper wall (13) and lower wall (14).
  2. Apparatus according to Claim 1,
    characterized in that
    the housing (1, 1') has a rotationally symmetrical part, in particular a cylindrical part.
  3. Apparatus according to Claim 2,
    characterized in that
    the cylindrical part has a vertical centre line.
  4. Apparatus according to Claim 2,
    characterized in that
    the cylindrical part has a horizontal centre line.
  5. Apparatus according to one of the preceding claims,
    characterized in that
    the apparatus is a pressure screen, in the housing (1') of which there is installed at least one screen (17), in particular a cylindrical screen, kept free of blockages by the rotor, and in that there is a reject outlet (18) to lead away the components of the fibrous suspension fed in that are rejected on the screen (17).
  6. Apparatus according to one of the preceding claims,
    characterized in that
    the apparatus has a central de-gassing pipe (8), with which gases (7), in particular air, which accumulate centrally as a result of the centrifugal forces generated by the rotational flow can be led out of the apparatus.
  7. Apparatus according to Claim 6,
    characterized in that
    the apparatus is a de-gassing apparatus for a paper fibrous suspension.
  8. Apparatus according to Claim 7,
    characterized in that
    the degassing apparatus has a stationary housing (1) which encloses a drum-shaped rotor (2), in the interior of which the fibrous suspension (S) that has flowed in can be set rotating.
  9. Apparatus according to one of Claims 1 to 5,
    characterized in that
    the apparatus contains a central lightweight-material extraction pipe with which lightweight materials which accumulate centrally as a result of the centrifugal forces generated by the rotational flow can be led out of the apparatus.
  10. Apparatus according to one of the preceding claims,
    characterized in that
    the guide element (3, 3') is annularly shaped and is arranged concentrically with the rotor (2).
  11. Apparatus according to one of the preceding claims,
    characterized in that
    the guide vanes (6') are curved.
  12. Apparatus according to one of Claims 1 to 10,
    characterized in that
    the guide vanes (6) have substantially flat guide surfaces.
  13. Apparatus according to one of the preceding claims,
    characterized in that
    the number of the guide vanes (6, 6') is at least three, preferably at least six.
  14. Apparatus according to one of the preceding claims,
    characterized in that
    upper wall (13) and lower wall (14) are flat and parallel.
  15. Apparatus according to one of the preceding claims 1 to 13,
    characterized in that
    the upper wall (13) or the lower wall has a convexly curved internal contour, which leads to the distance to the upper wall reducing radially inwards.
  16. Apparatus according to one of the preceding claims,
    characterized in that
    between the guide vanes (6, 6'), there are channels (5), the flow cross section of which decreases in the flow direction.
  17. Apparatus according to one of the preceding claims,
    characterized in that
    the inlet (4) is connected to the housing (1') tangentially.
  18. Apparatus according to one of the preceding claims,
    characterized in that
    the inlet is connected to a spiral inlet channel, which is located radially outside the guide element (3, 3').
  19. Apparatus according to one of Claims 1 to 16,
    characterized in that
    the inlet (4) is connected to the housing (1) centrally.
EP06010158A 2005-08-04 2006-05-17 Apparatus for treating a fibrous suspension Not-in-force EP1749923B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005036671 2005-08-04

Publications (2)

Publication Number Publication Date
EP1749923A1 EP1749923A1 (en) 2007-02-07
EP1749923B1 true EP1749923B1 (en) 2012-11-21

Family

ID=37387979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06010158A Not-in-force EP1749923B1 (en) 2005-08-04 2006-05-17 Apparatus for treating a fibrous suspension

Country Status (3)

Country Link
US (1) US7641767B2 (en)
EP (1) EP1749923B1 (en)
JP (1) JP4944532B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436418A (en) * 2016-12-01 2017-02-22 吕刚 Even cooking device for papermaking

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI126520B (en) * 2016-03-16 2017-01-31 Red Wire Oy Process for screening and screening device
CN109338783A (en) * 2018-11-29 2019-02-15 崔雪柯 A kind of pulp saver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5096127A (en) * 1990-08-22 1992-03-17 Ingersoll-Rand Company Apparatus for pressurized screening of a fibrous material liquid suspension
US6571957B1 (en) * 2000-08-07 2003-06-03 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
DE10060822B4 (en) * 2000-12-07 2006-04-27 Voith Paper Patent Gmbh Pressure sorter for removing contaminants from a paper pulp suspension containing contaminants
DE10233364C1 (en) * 2002-07-23 2003-12-24 Voith Paper Patent Gmbh Pressure sorter for sieving a fiber suspension

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106436418A (en) * 2016-12-01 2017-02-22 吕刚 Even cooking device for papermaking

Also Published As

Publication number Publication date
US20070029231A1 (en) 2007-02-08
JP4944532B2 (en) 2012-06-06
JP2007039870A (en) 2007-02-15
US7641767B2 (en) 2010-01-05
EP1749923A1 (en) 2007-02-07

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