EP1069234A1 - Method and device for removing impurities from a hydrocyclone - Google Patents

Method and device for removing impurities from a hydrocyclone Download PDF

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Publication number
EP1069234A1
EP1069234A1 EP00112006A EP00112006A EP1069234A1 EP 1069234 A1 EP1069234 A1 EP 1069234A1 EP 00112006 A EP00112006 A EP 00112006A EP 00112006 A EP00112006 A EP 00112006A EP 1069234 A1 EP1069234 A1 EP 1069234A1
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EP
European Patent Office
Prior art keywords
hydrocyclone
dilution liquid
added
flow
addition point
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00112006A
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German (de)
French (fr)
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EP1069234B1 (en
Inventor
Rolf Hartmann
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Voith Patent GmbH
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Voith Paper Patent GmbH
Voith Sulzer Papiertechnik Patent GmbH
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Priority claimed from DE20004255U external-priority patent/DE20004255U1/en
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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
    • D21D5/18—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force
    • D21D5/24—Purification of the pulp suspension by mechanical means; Apparatus therefor with the aid of centrifugal force in cyclones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/18—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with auxiliary fluid assisting discharge

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • hydrocyclones are well suited to removing heavy parts by centrifugal forces or concentrate light parts in fiber suspensions and by using one to lead the intended discharge opening out of the hydrocyclone.
  • the operational safety especially the freedom from clogging of such hydrocyclones particularly important. Blockages can occur if the contaminants, e.g. in the area of the discharge opening provided for them, so collect and concentrate that there is a blockage. In many cases, a A compromise can be found between operational safety, i.e.
  • a known way to To reduce the risk of constipation on heavy-duty hydrocyclones is that a dilution liquid is supplied.
  • a water supply leads into Edge area of the hydrocyclone e.g. through slots in the circumferential direction in the Cyclone wall.
  • the dilution fluid then swirls the outer layers and must penetrate the heavy dirt already concentrated in it, resulting in a Backwashing heavy parts in the accept stream can result.
  • the invention is based on the object of a method for applying To create contaminants from hydrocyclones, with which both a reliable Removal of the contaminants is possible, as well as a good separation effect.
  • the dilution liquid is therefore not introduced into the Edge of the hydrocyclone, where blockage is expected, but in the center, with axial Direction, and thus mainly in the core flow.
  • the dilution liquid With a sufficiently large one Inflow velocity the dilution liquid reaches the conical area of the separating room and mixes through the effect of the ruling ones Gradually shear flow with the surrounding fiber suspension.
  • the kind of Dilution leads to a gentle backwashing of the fibers in the material without that the same thing happens with already concentrated heavy parts, since these are on the wall and are not affected by the dilution water addition. Without the measures according to the invention, some of those that have already been concentrated would be concentrated Heavy parts whirled up and get into the middle of the hydrocyclone. From there then discharged with the accepted material.
  • the hydrocyclone 1 shows a hydrocyclone according to the invention, roughly schematically an inlet 2 for the paper fiber-containing suspension S and an accept material outlet 3 for the cleaned suspension, i.e. the accepted substance A.
  • the suspension S to be cleaned becomes set in rotation and enters the separating part 6 with a separating cone 1, in which the speed of rotation usually increases again. This will the contained heavy parts ST concentrated on the inner wall of the separating cone 1 and go down into the reject discharge device 17.
  • the designated addition point 5 has the narrowest Position 4 of the separating cone 1 is the distance a, which is preferably in axial Seen direction, is at most a few millimeters.
  • this can Distance a up to 30% of the length L of the hydrocyclone.
  • Another sensible one The requirement is that the axial distance to the inlet 2 be kept as large as possible e.g. at least 70% of the length L of the hydrocyclone.
  • the heavy parts ST fall, after they have passed the narrowest point 4 of the separating cone 1, into the Discharge chamber 8 from which it, e.g. via a discharge device 17, as reject R be removed.
  • This discharge can take place continuously or intermittently.
  • the dilution liquid W is replaced by a simple one vertical inlet pipe 9 is added, which is an axial and at the addition point 5 against the direction of discharge of the contaminants ST has an opening.
  • Circumferential component Vu (see FIG. 5) is so low compared to the axial speed Vax to hold that the angle ⁇ between the resultant of the two vectors and the Axis does not exceed 30 °. Overall, with this type of Dilution water addition to a much larger volume distributed and is therefore less harmful to the separation effect.
  • the liquid W is particularly advantageously at a certain axial position in the Hydrocyclone entered. Then there is only one opening at the addition point 5. It may be possible to adjust their position in the axial direction.
  • FIG. 2 shows a variant for carrying out the method Dilution liquid W via a curved inlet pipe 9 directly in the middle of the entered reject tube 11 below the separating cone 1. It is here the addition point 5 selected so that it is below the narrowest point 4, what but not necessarily so.
  • FIG. 3 shows a further possibility for carrying out the method.
  • the Dilution liquid W first placed in a flow insert 16 ', in the Inside there is a central displacement body 12, so that an annular Flow cross section arises.
  • the ring-shaped jet easily penetrates the one above part of the separating cone. It is also indicated here by arrows, like that Heavy parts ST slide down into the discharge chamber 8 near the wall. she can do this without going through the flow of the dilution liquid into the core flow of the Hydrocyclones to be flushed.
  • FIG. 4 shows an axial inflow of the Dilution liquid W through the central inlet pipe 9. It opens inside the Flow insert 16 '' via an injector 13 into a central tube 14 Parts of the suspension are sucked out of the hydrocyclone and in the middle again be added, which serves the stable operation and the fiber loss minimized.
  • FIG. 6 A hydrocyclone similar to that in FIG. 1 is shown in a perspective view in FIG. 6 shown. More constructive details are visible, but also these Drawing is still greatly simplified.
  • FIG. 7 essentially shows the lower part of FIG. 6 in an enlarged form.
  • Man This makes it easier to recognize that the inlet pipe 9 is screwed in exactly in the middle and in one circular opening opens here above the narrowest point 4. It's easy too mount and can be adjusted axially. With the help of the axial adjustment is one better adjustment of the hydrocyclone to the existing conditions possible.
  • the discharge chamber 8 of FIG. 8 has a slightly eccentrically inserted one Inlet pipe 9, but this remains in the radially inner region of the hydrocyclone.
  • the Outlet cross-section of the inlet pipe 9 holds one from the wall of the hydrocyclone Distance b a, which is at least 10% of the inside diameter of the hydrocyclone on it Digit is. It must be guaranteed that the already concentrated Heavy parts can no longer be washed in by the dilution liquid.
  • the Eccentricity can bring advantages in special cases, e.g. if the hydrocyclone is operated horizontally. It can also be made adjustable.
  • the flow inserts shown should only show the principle. More usable Flow applications are conceivable. In particular, their dimensions can be determined by Invoice and simple tests tailored to the respective purpose become.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cyclones (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Paper (AREA)

Abstract

A hydrocyclone (2) having a feed suspension inlet (2), clarified liquid outlet (3), and a separator section (1,6) with a bottom outlet (7,17) for discharge of concentrated slurry, is additionally provided with at least one inlet (5) allowing addition of a diluent liquid. The diluent inlet is located at a point in the radial interior of the hydrocyclone. The diluent addition point is positioned so that the diluent exits, essentially along the axis of the separator, with the clarified liquor (3). Preferably the diluent liquid is caused to rotate, and the inlet is located at a height 'a', not more than 30% of the hydrocyclone body height (L), and may be adjustable.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Hydrozyklone sind bekanntlich gut geeignet, um durch Zentrifugalkräfte Schwerteile oder Leichtteile in Faserstoffsuspensionen aufzukonzentrieren und durch eine dafür vorgesehene Austragsöffnung aus dem Hydrozyklon herauszuleiten. In der Regel dienen sie der Entfernung von kleinen Metallteilen, Glassplittern und Sand und/oder von Styropor und leichten Kunststoffen. Neben der Erzielung einer hohen Abscheidewirkung ist die Betriebssicherheit, insbesondere Verstopfungsfreiheit solcher Hydrozyklone besonders wichtig. Verstopfungen können dann auftreten, wenn sich die Störstoffe, z.B. im Bereich der für sie vorgesehenen Austragsöffnung, so ansammeln und aufkonzentrieren, dass es zu einem Blockieren kommt. In vielen Fällen muss ein Kompromiss gefunden werden zwischen der Betriebssicherheit, d.h. dem Vermeiden von Verstopfungen, einerseits, und einer möglichst hohen Effektivität der Maschine (Durchsatz, Abscheidewirkung), andererseits. Eine an sich bekannte Möglichkeit, um die Verstopfungsgefahr an Schwerteil-Hydrozyklonen zu vermindern, liegt darin, dass eine Verdünnungsflüssigkeit zugeführt wird. Dazu mündet eine Wasserzuleitung im Randbereich des Hydrozyklons z.B. durch in Umfangsrichtung geführte Schlitze in der Zyklonwand. Die Verdünnungsflüssigkeit wirbelt dann aber die Randschichten auf und muss den darin bereits aufkonzentrierten Schwerschmutz durchdringen, was zu einem Zurückspülen von Schwerteilen in den Gutstoffstrom führen kann.As is well known, hydrocyclones are well suited to removing heavy parts by centrifugal forces or concentrate light parts in fiber suspensions and by using one to lead the intended discharge opening out of the hydrocyclone. Usually serve the removal of small metal parts, broken glass and sand and / or Styrofoam and lightweight plastics. In addition to achieving a high separation effect is the operational safety, especially the freedom from clogging of such hydrocyclones particularly important. Blockages can occur if the contaminants, e.g. in the area of the discharge opening provided for them, so collect and concentrate that there is a blockage. In many cases, a A compromise can be found between operational safety, i.e. avoiding Blockages, on the one hand, and the highest possible effectiveness of the machine (Throughput, separation effect), on the other hand. A known way to To reduce the risk of constipation on heavy-duty hydrocyclones is that a dilution liquid is supplied. For this purpose, a water supply leads into Edge area of the hydrocyclone e.g. through slots in the circumferential direction in the Cyclone wall. The dilution fluid then swirls the outer layers and must penetrate the heavy dirt already concentrated in it, resulting in a Backwashing heavy parts in the accept stream can result.

Andere Lösungen benutzen zur Zugabe der Verdünnungsflüssigkeit ein Zentralrohr mit radial nach außen gerichteten Öffnungen. Ein Beispiel zeigt die CA 1 138 378 A. Auch hier gelangt die Verdünnungsflüssigkeit schnell an die Wand des Hydrozyklons mit den bereits beschriebenen schädlichen Wirkungen. Wegen des kurzen Abstandes und der direkt auf die Zyklonwand gerichteten Strömung der Verdünnungsflüssigkeit können unerwünschte Rückpralleffekte entstehen. Außerdem besteht erhöhte Verstopfungsgefahr der relativ klein zu haltenden Öffnungen. Die vorgeschlagene Drallströmung führt zu weiteren störenden Wirbeln.Other solutions use a central tube to add the dilution liquid radially outward openings. An example is shown in CA 1 138 378 A. Also here the dilution liquid quickly reaches the wall of the hydrocyclone with the harmful effects already described. Because of the short distance and the flow of the dilution liquid directed directly onto the cyclone wall undesirable rebound effects occur. There is also increased Risk of clogging of the openings, which are to be kept relatively small. The proposed one Swirl flow leads to further disturbing eddies.

Eine weitere Variante ist in der US 3,785,489 dargestellt. Hier liegt zwar eine axiale Ausströmung vor, allerdings soll durch eine Anzahl von Flügeln (vanes) am zentralen Einlauf des Verdünnungswassers eine Rotationsströmung erzeugt werden, die das Verdünnungswasser schnell nach außen treibt. Neben den bereits erwähnten Nachteilen bei der Wirkung dieser Strömung besteht auch bei solchen Flügeln erhöhte Verstopfungsgefahr.Another variant is shown in US 3,785,489. There is an axial one here Outflow ahead, however, through a number of vanes at the central Inlet of the dilution water to generate a rotational flow that is Dilution water expels quickly. In addition to the disadvantages already mentioned the effect of this flow is increased even with such wings Risk of constipation.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren zum Ausbringen von Störstoffen aus Hydrozyklonen zu schaffen, mit dem sowohl eine betriebssichere Ausschleusung der Störstoffe möglich ist, als auch eine gute Abscheidewirkung.The invention is based on the object of a method for applying To create contaminants from hydrocyclones, with which both a reliable Removal of the contaminants is possible, as well as a good separation effect.

Diese Aufgabe wird durch die im Kennzeichen des Anspruchs 1 genannten Merkmale gelöst.This object is achieved by the features mentioned in the characterizing part of claim 1 solved.

Erfindungsgemäß erfolgt das Einbringen der Verdünnungsflüssigkeit also nicht an den Rand des Hydrozyklons, wo die Verstopfung zu erwarten ist, sondern mittig , mit axialer Richtung, und damit überwiegend in die Kernströmung. Bei ausreichend großer Einströmgeschwindigkeit gelangt die Verdünnungsflüssigkeit in den konischen Bereich des Abscheideraumes und vermischt sich durch die Wirkung der dort herrschenden Scherströmung allmählich mit der umgebenden Faserstoffsuspension. Die Art der Verdünnung führt zu einer schonenden Rückspülung der Fasern in den Gutstoff , ohne dass dasselbe auch mit bereits aufkonzentrierten Schwerteilen geschieht, da sich diese an der Wand befinden und von der Verdünnungswasserzugabe nicht betroffen werden. Ohne die erfindungsgemäßen Maßnahmen würde ein Teil der bereits aufkonzentrierten Schwerteile aufgewirbelt und in die Mitte des Hydrozyklons gelangen. Von dort würden sie dann mit dem Gutstoff ausgetragen. According to the invention, the dilution liquid is therefore not introduced into the Edge of the hydrocyclone, where blockage is expected, but in the center, with axial Direction, and thus mainly in the core flow. With a sufficiently large one Inflow velocity the dilution liquid reaches the conical area of the separating room and mixes through the effect of the ruling ones Gradually shear flow with the surrounding fiber suspension. The kind of Dilution leads to a gentle backwashing of the fibers in the material without that the same thing happens with already concentrated heavy parts, since these are on the wall and are not affected by the dilution water addition. Without the measures according to the invention, some of those that have already been concentrated would be concentrated Heavy parts whirled up and get into the middle of the hydrocyclone. From there then discharged with the accepted material.

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

Fig. 1
die Durchführung des Verfahrens an Hand eines Schwerteil-Hydrozyklons in Seitenansicht, geschnitten;
Fig. 2 - 4
Varianten zur Zugabe der Verdünnungsflüssigkeit;
Fig. 5
ein Vektordiagramm von speziellen Geschwindigkeiten am Strahlrand der Verdünnungsflüssigkeit;
Fig. 6
eine perspektivische Ansicht eines erfindungsgemäßen Hydrozyklons;
Fig. 7 und 8
jeweils eine weitere Variante des unteren Teils des erfindungsgemäßen Hydrozyklons.
The invention and its advantages are explained with reference to drawings. Show:
Fig. 1
the implementation of the method using a heavy-duty hydrocyclone in side view, cut;
Figs. 2-4
Variants for adding the dilution liquid;
Fig. 5
a vector diagram of special velocities at the jet edge of the dilution liquid;
Fig. 6
a perspective view of a hydrocyclone according to the invention;
7 and 8
each a further variant of the lower part of the hydrocyclone according to the invention.

In Fig. 1 erkennt man grob schematisch einen erfindungsgemäßen Hydrozyklon mit einem Einlauf 2 für die papierfaserhaltige Suspension S sowie einem Gutstoffauslauf 3 für die gereinigte Suspension, also den Gutstoff A. Die zu reinigende Suspension S wird in Rotation versetzt und gelangt in den Abscheideteil 6 mit einem Abscheidekonus 1, in dem sich die Rotationsgeschwindigkeit in der Regel noch einmal erhöht. Dadurch werden die enthaltenen Schwerteile ST an der Innenwand des Abscheidekonus 1 aufkonzentriert und gelangen abwärts in die Rejektaustragsvorrichtung 17. Erfindungsgemäß wird die Verdünnungsflüssigkeit W in axialer Richtung in den radial inneren Bereich des Hydrozyklons eingeführt. Dabei hat die dafür bestimmte Zugabestelle 5 von der engsten Stelle 4 des Abscheidekonus 1 den Abstand a, welcher vorzugsweise , in axialer Richtung gesehen, höchstens einige Millimeter beträgt. In besonderen Fällen kann dieser Abstand a bis zu 30 % der Länge L des Hydrozyklons sein. Eine andere sinnvolle Anforderung ist die, dass die axiale Entfernung zum Einlauf 2 möglichst groß gehalten wird, z.B. mindestens 70 % der Länge L des Hydrozyklons. Die Schwerteile ST fallen, nachdem sie die engste Stelle 4 des Abscheidekonus 1 passiert haben, in die Austragskammer 8, aus der sie, z.B. über eine Austragsvorrichtung 17, als Rejekt R entfernt werden. Dieses Austragen kann kontinuierlich oder intermittierend erfolgen. Bei dem hier gezeigten Beispiel wird die Verdünnungsflüssigkeit W durch ein einfaches senkrechtes Zulaufrohr 9 zugegeben, welches an der Zugabestelle 5 eine axial und entgegen der Austragsrichtung der Störstoffe ST mündende Öffnung hat. Diese Figur soll auch schematisch verdeutlichen, dass die zugegebene Flüssigkeit W zum überwiegenden Teil in die zentrale Kernströmung des Hydrozyklons gelangt. Es ist nämlich wichtig, dass die herabsinkenden Störstoffe ST möglichst ungestört durch Wirbel etc. in die Austragskammer 8 fallen können. Andererseits kann durch die Zugabe der Flüssigkeit W durchaus eine unerwünschte Eindickung der Schwerfraktion verhindert werden, da eine partielle Verdünnung auch in den Außenbereichen des Abscheidekonus 1 möglich ist. Allerdings schwächen sich die Verdünnungswirkung und damit verbundenen Querströmungen, Wirbel etc, zur Konuswand hin sukzessive ab, so dass eine Beeinträchtigung des Abscheideeffekts nicht zu befürchten ist. Diese Vorgänge sind durch gestrichelte Pfeile 10 angedeutet. Falls in Sonderfällen eine geringe Rotation des austretenden Verdünnungswasserstromes nicht vermieden werden kann, wäre ihre Umfangskomponente Vu (s. Fig. 5) im Vergleich zur Axialgeschwindigkeit Vax so gering zu halten, dass der Winkel α zwischen der Resultierenden der beiden Vektoren und der Achse nicht größer wird als 30°. Insgesamt wird mit dieser Art der Verdünnungswasserzugabe die Einmischung auf ein wesentlich größeres Volumen verteilt und ist deshalb weniger schädlich für den Abscheideeffekt.1 shows a hydrocyclone according to the invention, roughly schematically an inlet 2 for the paper fiber-containing suspension S and an accept material outlet 3 for the cleaned suspension, i.e. the accepted substance A. The suspension S to be cleaned becomes set in rotation and enters the separating part 6 with a separating cone 1, in which the speed of rotation usually increases again. This will the contained heavy parts ST concentrated on the inner wall of the separating cone 1 and go down into the reject discharge device 17. According to the invention, the Dilution liquid W in the axial direction in the radially inner area of the Hydrocyclones introduced. The designated addition point 5 has the narrowest Position 4 of the separating cone 1 is the distance a, which is preferably in axial Seen direction, is at most a few millimeters. In special cases this can Distance a up to 30% of the length L of the hydrocyclone. Another sensible one The requirement is that the axial distance to the inlet 2 be kept as large as possible e.g. at least 70% of the length L of the hydrocyclone. The heavy parts ST fall, after they have passed the narrowest point 4 of the separating cone 1, into the Discharge chamber 8 from which it, e.g. via a discharge device 17, as reject R be removed. This discharge can take place continuously or intermittently. In the example shown here, the dilution liquid W is replaced by a simple one vertical inlet pipe 9 is added, which is an axial and at the addition point 5 against the direction of discharge of the contaminants ST has an opening. This figure is supposed to also schematically illustrate that the added liquid W predominantly Part of it reaches the central core flow of the hydrocyclone. It is important that the sinking interfering substances ST as undisturbed by eddies etc. in the Discharge chamber 8 can fall. On the other hand, by adding the liquid W an undesirable thickening of the heavy fraction can be prevented as a result partial dilution is also possible in the outer areas of the separating cone 1. However, the dilution effect and associated with it weaken Cross currents, eddies, etc., successively towards the cone wall, so that a Impairment of the separation effect is not to be feared. These operations are through dashed arrows 10 indicated. If in special cases a slight rotation of the escaping dilution water flow could not be avoided Circumferential component Vu (see FIG. 5) is so low compared to the axial speed Vax to hold that the angle α between the resultant of the two vectors and the Axis does not exceed 30 °. Overall, with this type of Dilution water addition to a much larger volume distributed and is therefore less harmful to the separation effect.

Mit besonderem Vorteil wird die Flüssigkeit W an einer bestimmten Axialposition in den Hydrozyklon eingegeben. Dann ist nur eine Öffnung an der Zugabestelle 5 vorhanden. Eventuell kann ihre Lage in axialer Richtung eingestellt werden.The liquid W is particularly advantageously at a certain axial position in the Hydrocyclone entered. Then there is only one opening at the addition point 5. It may be possible to adjust their position in the axial direction.

Eine Variante zur Durchführung des Verfahrens zeigt die Fig. 2. Bei dieser wird die Verdünnungsflüssigkeit W über ein gebogenes Zulaufrohr 9 direkt in die Mitte des sich unterhalb des Abscheidekonus 1 anschließenden Rejektrohres 11 eingegeben. Dabei ist hier die Zugabestelle 5 so gewählt, dass sie unterhalb der engsten Stelle 4 liegt, was aber nicht unbedingt so sein muss.FIG. 2 shows a variant for carrying out the method Dilution liquid W via a curved inlet pipe 9 directly in the middle of the entered reject tube 11 below the separating cone 1. It is here the addition point 5 selected so that it is below the narrowest point 4, what but not necessarily so.

Fig. 3 zeigt eine weitere Möglichkeit zur Durchführung des Verfahrens. Hier wird die Verdünnungsflüssigkeit W zunächst in einen Strämungseinsatz 16' gegeben, in dessen Innern sich ein zentraler Verdrängerkörper 12 befindet, so dass ein ringförmiger Strömungsquerschnitt entsteht. Der ringförmige Strahl dringt leicht in den darüber liegenden Teil des Abscheidekonus vor. Es ist hier auch durch Pfeile angedeutet, wie die Schwerteile ST in der Nähe der Wandung in die Austragskammer 8 hinabgleiten. Sie können das, ohne durch den Strom der Verdünnungsflüssigkeit in die Kernströmung des Hydrozyklons gespült zu werden.3 shows a further possibility for carrying out the method. Here is the Dilution liquid W first placed in a flow insert 16 ', in the Inside there is a central displacement body 12, so that an annular Flow cross section arises. The ring-shaped jet easily penetrates the one above part of the separating cone. It is also indicated here by arrows, like that Heavy parts ST slide down into the discharge chamber 8 near the wall. she can do this without going through the flow of the dilution liquid into the core flow of the Hydrocyclones to be flushed.

Die Ausführungsform gemäß Fig. 4 zeigt einen axialen Zustrom der Verdünnungsflüssigkeit W durch das mittige Zulaufrohr 9. Es mündet innerhalb des Strömungseinsatzes 16'' über einen Injektor 13 in ein Zentralrohr 14. Dadurch können Teile der Suspension aus dem Hydrozyklon herausgesaugt und in der Mitte wieder zugegeben werden, was der stabilen Betriebsweise dient und den Faserverlust minimiert.The embodiment according to FIG. 4 shows an axial inflow of the Dilution liquid W through the central inlet pipe 9. It opens inside the Flow insert 16 '' via an injector 13 into a central tube 14 Parts of the suspension are sucked out of the hydrocyclone and in the middle again be added, which serves the stable operation and the fiber loss minimized.

Ein ähnlicher Hydrozyklon, wie in Fig. 1, ist in einer perspektivischen Ansicht in Fig. 6dargestellt. Es sind zwar mehr konstruktive Details sichtbar, aber auch diese Zeichnung ist noch stark vereinfacht.A hydrocyclone similar to that in FIG. 1 is shown in a perspective view in FIG. 6 shown. More constructive details are visible, but also these Drawing is still greatly simplified.

Die Fig. 7 zeigt im wesentlichen den unteren Teil der Fig. 6 in vergrößerter Form. Man erkennt so leichter, dass das Zulauf rohr 9 exakt mittig eingeschraubt ist und in einer kreisförmigen Öffnung hier oberhalb der engsten Stelle 4 mündet. Es ist leicht zu montieren und kann axial verstellt werden. Mit Hilfe der Axialverstellung ist eine bessere Abstimmung des Hydrozyklons auf die vorhandenen Bedingungen möglich.FIG. 7 essentially shows the lower part of FIG. 6 in an enlarged form. Man This makes it easier to recognize that the inlet pipe 9 is screwed in exactly in the middle and in one circular opening opens here above the narrowest point 4. It's easy too mount and can be adjusted axially. With the help of the axial adjustment is one better adjustment of the hydrocyclone to the existing conditions possible.

Die Austragskammer 8 der Fig. 8 weist zwar ein leicht exzentrisch eingesetztes Zulaufrohr 9 auf, dieses bleibt aber im radial inneren Bereich des Hydrozyklons. Der Auslaufquerschnitt des Zulaufrohres 9 hält von der Wandung des Hydrozyklons einen Abstand b ein, der mindestens 10% vom Innendurchmesser des Hydrozyklons an dieser Stelle beträgt. Es muss gewährleistet bleiben, dass die bereits aufkonzentrierten Schwerteile nicht mehr durch die Verdünnungsflüssigkeit zugespült werden. Die Exzentrizität kann in speziellen Fällen Vorteile bringen, z.B. wenn der Hydrozyklon liegend betrieben wird. Auch sie kann einstellbar gemacht werden. The discharge chamber 8 of FIG. 8 has a slightly eccentrically inserted one Inlet pipe 9, but this remains in the radially inner region of the hydrocyclone. The Outlet cross-section of the inlet pipe 9 holds one from the wall of the hydrocyclone Distance b a, which is at least 10% of the inside diameter of the hydrocyclone on it Digit is. It must be guaranteed that the already concentrated Heavy parts can no longer be washed in by the dilution liquid. The Eccentricity can bring advantages in special cases, e.g. if the hydrocyclone is operated horizontally. It can also be made adjustable.

Je nach dem, in welcher Weise der Strämungseinsatz 16, 16' oder 16'' ausgeführt wird, ergeben sich unterschiedliche Wirkungen bei der Durchführung des Verfahrens. Diese unterschiedlichen Wirkungen sind in der Regel durchaus erwünscht. Es ist nämlich - je nach Anwendungsfall, d.h. also Durchsatz, Stoffdichte und Schmutzfracht, um nur diese zu nennen - eine spezielle Optimierung des Verfahrens möglich. In der Praxis ergibt sich ein wesentlicher Vorteil, wenn die verschiedenen Strömungseinsätze so ausgeführt werden, dass sie austauschbar sind. Dann kann ohne großen Aufwand, nämlich durch einfaches Austauschen der unterschiedlich ausgeführten Strömungseinsätze eine Abstimmung durchgeführt werden. Aus praktischen Erwägungen heraus wird man ohnehin dafür sorgen, dass die Strömungseinsätze leicht herausnehmbar sind, weil trotz aller Bestrebungen, eine Verstopfung zu vermeiden, das nicht immer gelingt.Depending on how the flow insert 16, 16 'or 16' 'is designed, there are different effects when the method is carried out. This different effects are generally quite desirable. Because it is - ever according to the application, i.e. throughput, consistency, and dirt load, to just this to name - a special optimization of the process possible. In practice results a major advantage if the various flow operations are carried out in this way that they are interchangeable. Then without much effort, namely through simply exchange the differently designed flow inserts Vote. For practical reasons, one becomes anyway make sure that the flow inserts are easily removable because despite of all efforts to avoid constipation, which is not always successful.

Die gezeichneten Strömungseinsätze sollen nur das Prinzip zeigen. Weitere verwendbare Strömungseinsätze sind denkbar. Insbesondere ihre Abmessungen können durch Rechnung und einfache Versuche auf den jeweiligen Verwendungszweck abgestimmt werden.The flow inserts shown should only show the principle. More usable Flow applications are conceivable. In particular, their dimensions can be determined by Invoice and simple tests tailored to the respective purpose become.

Claims (20)

Verfahren zum Ausbringen von Störstoffen aus einer papierfaserhaltigen Suspension (S) unter Verwendung eines Hydrozyklons, bei dem Verdünnungsflüssigkeit (W) im radial inneren Bereich des Hydrozykions in die Suspension (S) zugegeben wird,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) mit einer Strömungsrichtung, die gegen die axiale Austragsrichtung der Störstoffe gerichtet ist, zugegeben wird.Method for discharging impurities from a paper fiber-containing suspension (S) using a hydrocyclone, in which dilution liquid (W) is added to the suspension (S) in the radially inner region of the hydrocyclion,
characterized by
that the dilution liquid (W) is added with a flow direction that is directed against the axial discharge direction of the contaminants. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass der verwendete Hydrozyklon einen Abscheidekonus (1) aufweist und dass die Zugabestelle (5) für die Verdünnungsflüssigkeit (W) so gewählt wird, dass sie von der engsten Stelle (4) des Abscheidekonus (1) einen axialen Abstand (a) von höchstens 30 % der Länge (L) des Hydrozyklons hat.Method according to claim 1,
characterized by
that the hydrocyclone used has a separation cone (1) and that the addition point (5) for the dilution liquid (W) is selected such that it has an axial distance (a) of at most 30 from the narrowest point (4) of the separation cone (1) % of the length (L) of the hydrocyclone. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass der Strom der Verdünnungsflüssigkeit (W) ohne Drall zugegeben wird.The method of claim 1 or 2,
characterized by
that the flow of the dilution liquid (W) is added without swirl. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass der Strom der Verdünnungsflüssigkeit (W) lediglich mit einem Drall zugegeben wird, dessen resultierender Strömungsgeschwindigkeitsvektor von Umfangsgeschwindigkeit (Vu) und Axialgeschwindigkeit (Vax) am Strahlrand einen Winkel (α) zur Achse von höchstens 30° hat.The method of claim 1 or 2,
characterized by
that the flow of the dilution liquid (W) is added only with a swirl, the resulting flow velocity vector of peripheral velocity (Vu) and axial velocity (Vax) at the jet edge has an angle (α) to the axis of at most 30 °. Verfahren nach Anspruch 1, 2, 3 oder 4,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) mit einem glatten Strahl zugegeben wird,The method of claim 1, 2, 3 or 4,
characterized by
that the dilution liquid (W) is added with a smooth jet, Verfahren nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) in einem runden Strahl zugegeben wird.The method of claim 1, 2, 3, 4 or 5,
characterized by
that the dilution liquid (W) is added in a round jet. Verfahren nach Anspruch 1, 2, 3, 4 oder 5,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) in einem ringförmigen Strahl zugegeben wird.The method of claim 1, 2, 3, 4 or 5,
characterized by
that the dilution liquid (W) is added in an annular jet. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) mit Hilfe eines Injektors (13) in das Zentrum zugegeben wird und dass der Injektor (13) aus dem ringförmigen Bereich um die Zugabestelle (5) herum ansaugt.Method according to one of the preceding claims,
characterized by
that the dilution liquid (W) is added to the center with the aid of an injector (13) and that the injector (13) draws in from the annular area around the addition point (5). Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass die Verdünnungsflüssigkeit (W) mit einer Axialgeschwindigkeit von mindestens 4 m/s zugegeben wird.Method according to one of the preceding claims,
characterized by
that the dilution liquid (W) is added at an axial speed of at least 4 m / s. Verfahren nach einem der voranstehenden Ansprüche,
dadurch gekennzeichnet,
dass aus einer papierfaserhaltigen Suspension (S) eine Leichtfraktion als Gutstoff (A) gebildet wird und Schwerteile (ST) als Schwert raktion ausgeschieden werden.Method according to one of the preceding claims,
characterized by
that a light fraction as a good substance (A) is formed from a paper fiber-containing suspension (S) and heavy parts (ST) are excreted as a sword fraction. Hydrozyklon zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8 mit einem Einlauf (2) für die zu reinigende Suspension (S), einem Gutstoffauslauf (3) für die gereinigte Suspension, einem Abscheideteil (6), an den direkt oder indirekt eine Rejektaustragsvorrichtung (17) für die Schwerteile angeschlossen ist, wobei der Hydrozyklon mindestens einen Anschluss für die Zugabe von Verdünnungsflüssigkeit (W) aufweist, wobei die Zugabestelle (5) im radial inneren Bereich des Hydrozyklons liegt,
dadurch gekennzeichnet,
dass die Zugabestelle (5) mindestens eine axial und entgegen der Austragsrichtung der Störstoffe mündende Öffnung hat.Hydrocyclone for carrying out the method according to one of claims 1 to 8 with an inlet (2) for the suspension (S) to be cleaned, an accept material outlet (3) for the cleaned suspension, a separating part (6) to which a reject discharge device is directly or indirectly connected (17) is connected for the heavy parts, the hydrocyclone having at least one connection for the addition of dilution liquid (W), the addition point (5) being in the radially inner region of the hydrocyclone,
characterized by
that the addition point (5) has at least one opening opening axially and counter to the discharge direction of the contaminants. Hydrozyklon nach Anspruch 11,
dadurch gekennzeichnet,
dass die Zugabestelle (5) an einer Stelle liegt, die vom Einlauf (2) der Suspension (S) in den Hydrozyklon in axialer Richtung mindestens 70 % der Länge (L) des Hydrozyklons entfernt ist.Hydrocyclone according to Claim 11,
characterized by
that the addition point (5) is located at a point which is at least 70% of the length (L) of the hydrocyclone in the axial direction from the inlet (2) of the suspension (S) into the hydrocyclone. Hydrozyklon nach Anspruch 12,
dadurch gekennzeichnet,
dass der Abscheideteil (6) einen Abscheidekonus (1) enthält.Hydrocyclone according to claim 12,
characterized by
that the separating part (6) contains a separating cone (1). Hydrozyklon nach Anspruch 11, 12 oder 13,
dadurch gekennzeichnet,
dass die Zugabestelle (5) Teil eines Strömungseinsatzes (16, 16', 16'') ist, der in den Hydrozyklon eingesetzt ist.Hydrocyclone according to Claim 11, 12 or 13,
characterized by
that the addition point (5) is part of a flow insert (16, 16 ', 16'') which is inserted into the hydrocyclone. Hydrozyklon nach Anspruch 14,
dadurch gekennzeichnet,
dass der Strömungseinsatz (16, 16', 16'') gegen einen anderen Strämungseinsatz austauschbar ist, welcher bezüglich seiner Strömungswirkung anders ausgestaltet ist.Hydrocyclone according to claim 14,
characterized by
that the flow insert (16, 16 ', 16'') is interchangeable with another flow insert, which is designed differently with regard to its flow effect. Hydrozyklon nach Anspruch 11, 12, 13, 14 oder 15,
dadurch gekennzeichnet,
dass der Querschnitt der Öffnung verstellbar ist.Hydrocyclone according to Claim 11, 12, 13, 14 or 15,
characterized by
that the cross section of the opening is adjustable. Hydrozyklon nach einem der Ansprüche 11 bis 16,
dadurch gekennzeichnet,
dass die Position der Öffnung verstellbar ist.Hydrocyclone according to one of claims 11 to 16,
characterized by
that the position of the opening is adjustable. Hydrozyklon nach einem der Ansprüche 11 bis 17,
dadurch gekennzeichnet,
dass die Zugabestelle (5) konzentrisch mit der Mitte des Hydrozyklons angeordnet ist.Hydrocyclone according to one of claims 11 to 17,
characterized by
that the addition point (5) is arranged concentrically with the center of the hydrocyclone. Hydrozyklon nach einem der Ansprüche 11 bis 17,
dadurch gekennzeichnet,
dass die Zugabestelle (5) exzentrisch zur Mitte des Hydrozyklons und in einem Abstand (b) von der Innenwand des Hydrozyklons angeordnet ist, der mindestens 10 % des Innendurchmessers des Hydrozyklons an dieser Stelle beträgt.Hydrocyclone according to one of claims 11 to 17,
characterized by
that the addition point (5) is arranged eccentrically to the center of the hydrocyclone and at a distance (b) from the inner wall of the hydrocyclone that is at least 10% of the inner diameter of the hydrocyclone at this point. Hydrozyklon nach einem der Ansprüche 11 bis 19,
dadurch gekennzeichnet,
dass die Zugabestelle (5) durch die Mündungsöffnung eines Zulaufrohres (9) gebildet wird, welches unterhalb des engsten Querschnittes des Abscheideteils (6) in den Hydrozyklon eingeführt wird.Hydrocyclone according to one of claims 11 to 19,
characterized by
that the addition point (5) is formed by the mouth opening of an inlet pipe (9) which is introduced into the hydrocyclone below the narrowest cross section of the separating part (6).
EP00112006A 1999-07-06 2000-06-02 Method and device for removing impurities from a hydrocyclone Expired - Lifetime EP1069234B1 (en)

Applications Claiming Priority (4)

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DE19931166 1999-07-06
DE19931166 1999-07-06
DE20004255U 2000-03-07
DE20004255U DE20004255U1 (en) 1999-07-06 2000-03-07 Hydrocyclone

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ATE267909T1 (en) 2004-06-15

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