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EP1462567B1 - Screen for purification of fibrous pulp - Google Patents

Screen for purification of fibrous pulp Download PDF

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Publication number
EP1462567B1
EP1462567B1 EP04006304A EP04006304A EP1462567B1 EP 1462567 B1 EP1462567 B1 EP 1462567B1 EP 04006304 A EP04006304 A EP 04006304A EP 04006304 A EP04006304 A EP 04006304A EP 1462567 B1 EP1462567 B1 EP 1462567B1
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EP
European Patent Office
Prior art keywords
rotor
screen according
separating unit
dilution water
feed
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 - Lifetime
Application number
EP04006304A
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German (de)
French (fr)
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EP1462567A1 (en
Inventor
Helmuth Dipl.Ing. Dr. Gabl
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Andritz AG
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Andritz AG
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Filing date
Publication date
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Publication of EP1462567A1 publication Critical patent/EP1462567A1/en
Application granted granted Critical
Publication of EP1462567B1 publication Critical patent/EP1462567B1/en
Anticipated expiration legal-status Critical
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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

Definitions

  • the invention relates to a sorter for cleaning a fiber suspension according to the preamble of claim 1.
  • Sorters are machines used in the paper industry for cleaning a stock suspension consisting of water, fibers and dirt particles.
  • a feed stream is passed through a sieve device, wherein the accept flow, consisting of water and fibers, flows through the sieve.
  • a partial stream, called the reject stream, consisting of water, fibers and contaminants, is generally withdrawn at the end opposite the feed stream.
  • the reject stream consisting of water, fibers and contaminants.
  • such a sorter is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually provided with holes or vertical slots and a rotating rotor.
  • the task of the rotor is to keep the sieve slots free, which is achieved by wings that rotate just short of the sieve surface.
  • the accept stream is collected in a so-called accept space, which is often conical, and withdrawn radially.
  • the reject flow is generally conducted at the point opposite the feed of the screen basket in a mostly annular Rejektraum and subtracted tangentially from this.
  • Such a sorter is eg from the US 4,268,381 known.
  • the rotor is designed in these known sorters for a uniform Siebanströmung and has the shape of a parabola, so that the axial flow rate within the screen basket remains constant assuming uniform outflow through the sieve.
  • the shape of the rotor can also be approximated by a cone shape.
  • sorters As a multi-stage sorter comprising a plurality of sequential separation units.
  • the US-A-4697982 discloses a single stage sorter with a parabolic rotor and a dilution water supply over almost the entire rotor height.
  • the US-A-6241102 discloses a single stage sorter with a conical rotor with a dilution water supply in the region of the reject outlet.
  • the WO 98/46821 also describes a single stage sorter with a dilution water feed. The dilution water is supplied in the fixed lower part, which emerges at the level of the accept outlet.
  • the present invention has as its object to provide a sorter in which a further improvement of the flow conditions and thus a reduction of the energy used in increased production and dirt separation is achieved.
  • the emerging reject is diluted with water.
  • this dilution is favorable.
  • One or more feeds for dilution water can be provided which can be arranged on the housing of the separation unit or on the screen basket and / or arranged on the rotor.
  • this supply is preferably fed by a line located inside the rotor.
  • the optionally multiple feeds for dilution water may be oriented so that dilution water can be introduced in the rotor running direction and / or against the rotor running direction.
  • Another preferred embodiment of the sorter according to the invention is characterized in that in the region of the maximum diameter of the rotor one or more means (s) for interrupting the axial flow is / are arranged.
  • devices in the majority is generally used, whereby also sorter according to the invention are meant, which only contain a device for interrupting the axial flow.
  • pulps Depending on their origin, type of pulp (recycled goods, fresh fiber, etc.), pulps have a different degree of contamination.
  • the sorter must set certain minimum carrier quantities (rejects) as a function of the proportion of dirt and specks as well as the rheological suspension properties.
  • the means for interrupting the axial flow can be arranged on the housing of the separation unit or on the screen basket and / or arranged on the rotor of the sorter.
  • means for interrupting the axial flow are provided on both sides (i.e., both on the housing and on the rotor).
  • the devices are one or more axial flow interrupter rings.
  • the flow breaker ring may be configured continuously or in the form of individual segments or may have interruptions.
  • the flow breaker ring (or the flow breaker rings) may be adjustable, so that the size of the passage created by the breaker ring is variable for the reject.
  • the flow breaker ring can be made adjustable, for example in the manner of a Fotoiris. Furthermore, the flow breaker ring can be made statically adjustable (e.g., in the form of statically adjustable ring segments).
  • the outer diameter of a rotor-side arranged flow breaker ring preferably has a tooth-shaped profile.
  • At least one feed for dilution water is coupled to a device for interrupting the axial flow.
  • the supply for Dilution water protrude into the space between the housing and the rotor and thus serve as a means for interrupting the axial flow.
  • the suspension consistency as described above, adjusted by means of an intermediate dilution. It has proven to be favorable to counteract the concentration of the speckle portion by the interposition of a Entstippungsaku.
  • the separating unit of the sorter according to the invention preferably comprises a deflaking unit.
  • the deflaking unit is advantageously configured in the form of one or more rings arranged on the housing or screen basket and / or on the rotor.
  • the shape of the internals used corresponds to known types, with additional hydraulic guide elements can be introduced to adjust the pressure differences.
  • the sorter according to the invention comprises two or more separation units arranged one after the other, all separation units comprising a common rotor which has a parabolic shape or parabolic segment shape respectively adapted to the flow conditions in the separation unit for each separation unit.
  • each separation unit is at least twice as large as the sum of the heights of the separation units following the separation unit, ie that in a sorter having three separation units the height of the first stage is at least 2/3 of the total height of the aggregate and that of the second stage at least 2/9 of the total height.
  • one or more are in the region of the maximum diameter Arranged to interrupt the axial flow, as described above.
  • At least one supply for dilution water is arranged in each separation unit in the region of the reject outlet or below it.
  • the dilution water feed may be located in the lower boundary of the rotor segment of a separation unit such that the dilution water is discharged into the space below the rotor segment (and thus into the region of the reject outlet and below, respectively).
  • the supply of dilution water may be arranged in the upper region of the rotor segment of the next following separation unit.
  • At least one deflaking unit is preferably provided, in particular at the transition from the second to the third separating unit.
  • the sorter according to the invention preferably has one or more of the features in the EP 1 122 358 A2 , of the EP 1 124 002 A2 and the EP 1 124 003 A2 described sorter on.
  • the sorter 1 comprises in a conventional manner an inlet nozzle 2, through which a pulp suspension is fed for cleaning.
  • an installation 3 is provided, which is shown here as a truncated cone.
  • the pulp suspension enters the space between the parabolic rotor 4 and sieve 5 and is conveyed through the sieve into the acceptance space 6.
  • the housing of the accept space is executed in this embodiment in a conventional manner biconical.
  • the reference numeral 7 designates the accept outlet.
  • the reject is removed via a reject outlet 8.
  • FIG. 2 In the FIG. 2 are devices corresponding to those of the embodiment of the prior art FIG. 1 are identical, denoted by the same reference numerals.
  • the sorter 1 In the preferred embodiment of a sorter according to the invention FIG. 2 the sorter 1 consists of three separation units 1 ', 1 "and 1"'.
  • the three separation units 1 ', 1 "and 1'” comprise a common rotor whose respective sections 4 ', 4 "and 4"' are configured parabolically or in the form of a paraboloid stub, adapted to the flow conditions in the respective separation unit.
  • the sections of the rotor may also be frusto-conical or approximated to the shape of a parabola.
  • Each separation unit has a reject outlet (9 ', 9 ", 9"').
  • the reject of the first or second separation unit is at the same time inlet for the next separation unit.
  • the reject of the third and last separation unit is discharged via the reject outlet 8.
  • a deflaking unit 13 is provided.
  • FIGS. 3 and 4 are now preferred embodiments of a Rejektauslasses (in this case the Rejektauslasses 9 ') in an enlargement of the in the FIG. 2 dash-dotted lines indicated section.
  • feeds for dilution water 10a ', 10b' and 10c ' are provided both on the housing side and on the rotor sections 4' and 4 "in the region of the reject outlet 9 'and below, respectively.
  • the feeder 10a ' is arranged in the lower boundary of the rotor segment 4' of the first separation unit 1 '.
  • the feeder 10b ' is arranged in the upper region of the rotor segment 4 "of the second separation unit 1".
  • Feeds 10a 'and 10b' may be defined by a conduit 10 disposed within the rotor (see FIG. 2 ) are fed.
  • the feeder 10c ' is arranged, for example, in the region of a flange 11 between the first separation unit 1' and second separation unit 1 "and is fed by a line, not shown.
  • the dilution water feeds 10a ', 10b' and 10c ' can be used to efficiently control the consistency of the fiber suspension flowing into the next separation unit.
  • the adjusting ring can, as explained above, for example in the form of a Fotoiris be arranged adjustable (indicated by the double arrow).
  • the outer diameter of the adjusting ring or its segments preferably has a tooth-shaped profile.
  • FIG. 4 illustrated embodiment of Rejektauslasses 9 'differs from the embodiment according to FIG. 3 in that in addition to the adjusting ring 12a ', a flow interrupting ring 12b' is arranged on the housing side.
  • the housing side feeder 10c' for dilution water is further arranged, ie, the dilution water supply and the flow breaker ring are coupled together.
  • the embodiment according to FIG. 4 further feeds for dilution water on the rotor, as in FIG. 3 represented, be provided.

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

Description

Die Erfindung betrifft einen Sortierer zur Reinigung einer Fasersuspension gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a sorter for cleaning a fiber suspension according to the preamble of claim 1.

Sortierer sind in der Papierindustrie eingesetzte Maschinen zur Reinigung einer Stoffsuspension, die aus Wasser, Faserstoffen und Schmutzpartikeln besteht. Dabei wird ein Zulaufstrom über eine Siebvorrichtung geführt, wobei der Akzeptstrom, bestehend aus Wasser und Fasern, durch das Sieb hindurchströmt. Ein Teilstrom, genannt Rejektstrom, bestehend aus Wasser, Fasern und Schmutzstoffen, wird im allgemeinen an dem dem Zulaufstrom gegenüberliegenden Ende abgezogen. Somit erfolgt bei den Sortierern eine Auftrennung von in Flüssigkeit vorliegenden festen Partikeln. Im Gegensatz dazu wird bei der Filtration die Flüssigkeit vom Feststoff abgetrennt.Sorters are machines used in the paper industry for cleaning a stock suspension consisting of water, fibers and dirt particles. In this case, a feed stream is passed through a sieve device, wherein the accept flow, consisting of water and fibers, flows through the sieve. A partial stream, called the reject stream, consisting of water, fibers and contaminants, is generally withdrawn at the end opposite the feed stream. Thus, in the sorters, there is a separation of solid particles present in liquid. In contrast, during filtration, the liquid is separated from the solid.

Im allgemeinen ist ein derartiger Sortierer rotationssymmetrisch ausgeführt und besteht aus einem Gehäuse mit einem tangential angeordneten Zulauf, einem zylindrischen Siebkorb, meist mit Löchern oder senkrechten Schlitzen versehen und einem sich drehenden Rotor. Die Aufgabe des Rotors besteht in der Freihaltung der Siebschlitze, was durch knapp an der Sieboberfläche rotierende Flügel erreicht wird. Der Akzeptstrom wird in einem sogenannten Akzeptraum, der oft konisch ausgeführt ist, gesammelt und radial abgezogen. Der Rejektstrom wird im allgemeinen an der dem Zulauf gegenüberliegenden Stelle des Siebkorbes in einem meist ringförmigen Rejektraum geführt und aus diesem tangential abgezogen.In general, such a sorter is rotationally symmetrical and consists of a housing with a tangentially arranged inlet, a cylindrical screen basket, usually provided with holes or vertical slots and a rotating rotor. The task of the rotor is to keep the sieve slots free, which is achieved by wings that rotate just short of the sieve surface. The accept stream is collected in a so-called accept space, which is often conical, and withdrawn radially. The reject flow is generally conducted at the point opposite the feed of the screen basket in a mostly annular Rejektraum and subtracted tangentially from this.

Ein derartiger Sortierer ist z.B. aus der US 4,268,381 bekannt.Such a sorter is eg from the US 4,268,381 known.

Weitere bekannte Sortierer werden beispielsweise in der EP 1 122 358 A2 , der EP 1 124 002 A2 und der EP 1 124 003 A2 beschrieben.Other well-known sorters are used for example in the EP 1 122 358 A2 , of the EP 1 124 002 A2 and the EP 1 124 003 A2 described.

In den Sortierern gemäß EP 1 122 358 A2 , der EP 1 124 002 A2 und EP 1 124 003 A2 werden insbesondere zur Verbesserung der Strömungsverhältnisse die folgenden Maßnahmen getroffen:

  • Im Zulaufbereich ist ein zusätzlicher Siebkorb zur Vorsortierung vorgesehen.
  • Im Zulaufbereich ist zwischen dem Rohrstutzen und dem freien Ende des Rotors ein stationärer Einbau, insbesondere ein Kegel, Kegelstumpf, Halbkugel, Kugelsegment, Kugelschicht, Paraboloid oder zweischaliges Hyperboloid vorgesehen.
  • Der Akzeptraum ist doppelt konisch ausgestaltet, erweitert sich in Strömungsrichtung der Faserstoffsuspension und verjüngt sich ab der Mündung des Akzeptauslasses konisch zum Rejektauslass hin.
In the sorters according to EP 1 122 358 A2 , of the EP 1 124 002 A2 and EP 1 124 003 A2 In particular, the following measures are taken to improve the flow conditions:
  • In the inlet area an additional screen basket is provided for pre-sorting.
  • In the inlet region, a stationary installation, in particular a cone, truncated cone, hemisphere, spherical segment, spherical layer, paraboloid or bivalve hyperboloid is provided between the pipe socket and the free end of the rotor.
  • The acceptance space is configured twice conically, widens in the direction of flow of the pulp suspension and tapers conically from the mouth of the accept outlet towards the reject outlet.

Der Rotor ist bei diesen bekannten Sortierern für eine gleichmäßige Siebanströmung ausgelegt und weist die Form einer Parabel auf, so dass die axiale Strömungsgeschwindigkeit innerhalb des Siebkorbes bei angenommener gleichförmiger Ausströmung durch das Sieb konstant bleibt. Alternativ kann die Form des Rotors auch über eine Konusform angenähert werden.The rotor is designed in these known sorters for a uniform Siebanströmung and has the shape of a parabola, so that the axial flow rate within the screen basket remains constant assuming uniform outflow through the sieve. Alternatively, the shape of the rotor can also be approximated by a cone shape.

Es ist weiters bekannt, Sortierer als Mehrstufensortierer auszugestalten, die mehrere hintereinander geschaltete Abtrenneinheiten umfassen.It is also known to design sorters as a multi-stage sorter comprising a plurality of sequential separation units.

Die US-A- 4697982 offenbart einen einstufigen Sortierer mit einem parabelförmigen Rotor und einer Verdünnungswasserzufuhr über beinahe die gesamte Rotorhöhe. Die US-A-6241102 offenbart einen einstufigen Sortierer mit einem kegelförmigen Rotor mit einer Verdünnungswasserzufuhr im Bereich des Rejektauslasses. Die WO 98/46821 beschreibt ebenfalls einen einstufigen Sortierer mit einer Verdünnungswasserzufuhr. Das Verdünnungswasser wird im feststehenden unteren Teil zugeführt, das in der Höhe des Akzeptauslasses austritt.The US-A-4697982 discloses a single stage sorter with a parabolic rotor and a dilution water supply over almost the entire rotor height. The US-A-6241102 discloses a single stage sorter with a conical rotor with a dilution water supply in the region of the reject outlet. The WO 98/46821 also describes a single stage sorter with a dilution water feed. The dilution water is supplied in the fixed lower part, which emerges at the level of the accept outlet.

Die aus dem Stand der Technik bekannten Sortierer weisen jedoch nach wie vor Nachteile auf. Insbesondere lassen die Strömungsverhältnisse im Bereich des Rejektauslasses zu wünschen übrig.However, the known from the prior art sorters still have disadvantages. In particular, the flow conditions in the region of the reject outlet leave something to be desired.

Die vorliegende Erfindung stellt sich zur Aufgabe, einen Sortierer zur Verfügung zu stellen, in welchem eine weitere Verbesserung der Strömungsverhältnisse und damit eine Verringerung der eingesetzten Energie bei gesteigerter Produktion und Schmutzabscheidung erzielt wird.The present invention has as its object to provide a sorter in which a further improvement of the flow conditions and thus a reduction of the energy used in increased production and dirt separation is achieved.

Die Aufgabe wird gemäß der vorliegenden Erfindung mit einem Sortierer gemäß Patentanspruch 1 gelöst. Weitere bevorzugte Ausführungsformen des erfindungsgemäßen Sortierers sind in den Unteransprüchen beschrieben.The object is achieved according to the present invention with a sorter according to claim 1. Further preferred embodiments of the sorter according to the invention are described in the subclaims.

Dadurch wird das austretende Rejekt mit Wasser verdünnt. Bei der mehrstufigen Ausgestaltung des Sortierers, bei welcher das Rejekt einer Stufe gleichzeitig zum Zulauf der nächstfolgenden Stufe wird, ist diese Verdünnung günstig.As a result, the emerging reject is diluted with water. In the multi-stage embodiment of the sorter, in which the reject of one stage simultaneously becomes the inlet of the next step, this dilution is favorable.

Es können eine oder mehrere Zufuhren für Verdünnungswasser vorgesehen sein, die am Gehäuse der Abtrenneinheit bzw. am Siebkorb angeordnet und/oder am Rotor angeordnet sein können. Im Falle einer Anordnung einer Zufuhr für Verdünnungswasser am Rotor wird diese Zufuhr bevorzugt durch eine innerhalb des Rotors befindliche Leitung gespeist.One or more feeds for dilution water can be provided which can be arranged on the housing of the separation unit or on the screen basket and / or arranged on the rotor. In the case of an arrangement of a supply of dilution water to the rotor, this supply is preferably fed by a line located inside the rotor.

Die gegebenenfalls mehreren Zufuhren für Verdünnungswasser können so ausgerichtet sein, dass Verdünnungswasser in Rotorlaufrichtung und/oder gegen die Rotorlaufrichtung eingebracht werden kann.The optionally multiple feeds for dilution water may be oriented so that dilution water can be introduced in the rotor running direction and / or against the rotor running direction.

Damit kann die Rotationsbewegung der Faserstoffsuspension reduziert werden. Durch die Verwirbelung der Suspension kann die Auflockerung derselben verbessert werden.Thus, the rotational movement of the pulp suspension can be reduced. Due to the turbulence of the suspension, the loosening of the same can be improved.

Eine weitere bevorzugte Ausführungsform des erfindungsgemäßen Sortierers ist dadurch gekennzeichnet, und dass im Bereich des maximalen Durchmessers des Rotors eine oder mehrere Einrichtung(en) zur Unterbrechung der axialen Strömung angeordnet ist/sind.Another preferred embodiment of the sorter according to the invention is characterized in that in the region of the maximum diameter of the rotor one or more means (s) for interrupting the axial flow is / are arranged.

Im folgenden wird generell der Begriff "Einrichtungen" (in der Mehrzahl) verwendet, wobei dabei auch erfindungsgemäße Sortierer gemeint sind, welche nur eine Einrichtung zur Unterbrechung der axialen Strömung enthalten.In the following, the term "devices" (in the majority) is generally used, whereby also sorter according to the invention are meant, which only contain a device for interrupting the axial flow.

Faserstoffe weisen je nach Herkunft, Art des Faserstoffes (Recyclingware, Frischfaser etc.) einen unterschiedlichen Verschmutzungsgrad auf. Für einen stabilen Lauf des Sortierers sind bestimmte Mindestträgermengen (Rejektmengen) in Abhängigkeit vom Schmutz- und Stippenanteil sowie der rheologischen Suspensionseigenschaften einzustellen.Depending on their origin, type of pulp (recycled goods, fresh fiber, etc.), pulps have a different degree of contamination. For a stable run The sorter must set certain minimum carrier quantities (rejects) as a function of the proportion of dirt and specks as well as the rheological suspension properties.

Es hat sich gezeigt, dass es günstig ist, auf Höhe des maximalen Rotordurchmessers Einrichtungen zur Unterbrechung der axialen Strömung anzuordnen, um den stabilen Lauf des Sortierers zu gewährleisten.It has been found that it is favorable to arrange means for interrupting the axial flow at the height of the maximum rotor diameter in order to ensure the stable operation of the sorter.

Die Einrichtungen zur Unterbrechung der axialen Strömung können dabei am Gehäuse der Abtrenneinheit bzw. am Siebkorb angeordnet und/oder am Rotor des Sortierers angeordnet sein. Somit ist auch eine Ausführungsform, in welcher beidseitig (d.h. sowohl am Gehäuse als auch am Rotor) Einrichtungen zur Unterbrechung der axialen Strömung vorgesehen sind, möglich.The means for interrupting the axial flow can be arranged on the housing of the separation unit or on the screen basket and / or arranged on the rotor of the sorter. Thus, it is also possible to have an embodiment in which means for interrupting the axial flow are provided on both sides (i.e., both on the housing and on the rotor).

Bevorzugt handelt es sich bei den Einrichtungen um einen oder mehrere axiale Strömungsunterbrecherringe. Der Strömungsunterbrecherring kann je nach Ausführungsform durchgehend oder in Form von einzelnen Segmenten ausgestaltet sein bzw. Unterbrechungen aufweisen.Preferably, the devices are one or more axial flow interrupter rings. Depending on the embodiment, the flow breaker ring may be configured continuously or in the form of individual segments or may have interruptions.

Der Strömungsunterbrecherring (bzw. die Strömungsunterbrecherringe) kann dabei verstellbar sein, sodass die Größe des durch den Unterbrecherringes geschaffenen Durchlasses für das Rejekt veränderbar ist.The flow breaker ring (or the flow breaker rings) may be adjustable, so that the size of the passage created by the breaker ring is variable for the reject.

Der Strömungsunterbrecherring kann beispielsweise nach Art einer Fotoiris verstellbar ausgeführt sein. Weiters kann der Strömungsunterbrecherring statisch verstellbar (z.B. in Form von statisch verstellbaren Ringsegmenten) ausgeführt sein.The flow breaker ring can be made adjustable, for example in the manner of a Fotoiris. Furthermore, the flow breaker ring can be made statically adjustable (e.g., in the form of statically adjustable ring segments).

Der Außendurchmesser eines rotorseitig angeordneten Strömungsunterbrecherringes weist bevorzugt ein zahnförmiges Profil auf.The outer diameter of a rotor-side arranged flow breaker ring preferably has a tooth-shaped profile.

In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Sortierers ist zumindest eine Zufuhr für Verdünnungswasser mit einer Einrichtung zur Unterbrechung der axialen Strömung gekoppelt. Beispielsweise kann die Zufuhr für Verdünnungswasser in den Raum zwischen Gehäuse und Rotor hineinragen und somit als Einrichtung zur Unterbrechung der axialen Strömung dienen.In a further preferred embodiment of the sorter according to the invention, at least one feed for dilution water is coupled to a device for interrupting the axial flow. For example, the supply for Dilution water protrude into the space between the housing and the rotor and thus serve as a means for interrupting the axial flow.

Insbesondere bei mehrstufigen Sortierern erfolgt während des Stoffdurchlaufes von der ersten zur letzten Sortierstufe einerseits eine Eindickung der Suspension im Zuströmbereich der Siebfläche und andererseits eine Aufkonzentration des Stippenanteiles.Particularly in the case of multistage sorters, during the flow of material from the first to the last sorting stage, on the one hand thickening of the suspension in the inflow region of the sieve surface and, on the other hand, an accumulation of the speck portion.

Zur Aufrechterhaltung der Sortierwirkung wird die Suspensionskonsistenz, wie zuvor beschrieben, mittels einer Zwischenverdünnung eingestellt. Es hat sich als günstig herausgestellt, der Aufkonzentration des Stippenanteiles durch das Zwischenschalten einer Entstippungseinheit entgegenzuwirken.To maintain the sorting effect, the suspension consistency, as described above, adjusted by means of an intermediate dilution. It has proven to be favorable to counteract the concentration of the speckle portion by the interposition of a Entstippungseinheit.

Dementsprechend umfasst die Abtrenneinheit des erfindungsgemäßen Sortierers bevorzugt eine Entstippungseinheit. Die Entstippungseinheit ist vorteilhaft in Form von ein oder mehreren am Gehäuse bzw. Siebkorb und/oder am Rotor angeordneten Ringen ausgestaltet. Die Form der verwendeten Einbauten entspricht an sich bekannten Typen, wobei zusätzlich hydraulische Leitelemente eingebracht werden können, um die Druckdifferenzen einzustellen.Accordingly, the separating unit of the sorter according to the invention preferably comprises a deflaking unit. The deflaking unit is advantageously configured in the form of one or more rings arranged on the housing or screen basket and / or on the rotor. The shape of the internals used corresponds to known types, with additional hydraulic guide elements can be introduced to adjust the pressure differences.

Der erfindungsgemäße Sortierer umfaßt zwei oder mehrere nacheinander angeordnete Abtrenneinheiten , wobei alle Abtrenneinheiten einen gemeinsamen Rotor umfassen, der je Abtrenneinheit eine jeweils an die Strömungsverhältnisse in der Abtrenneinheit angepasste Parabelform bzw. Parabelsegmentform aufweist.The sorter according to the invention comprises two or more separation units arranged one after the other, all separation units comprising a common rotor which has a parabolic shape or parabolic segment shape respectively adapted to the flow conditions in the separation unit for each separation unit.

Bevorzugt ist die Höhe jeder Abtrenneinheit zumindest zweimal so groß wie die Summe der Höhen der an die Abtrenneinheit anschließenden Abtrenneinheiten, d.h., dass bei einem Sortierer mit drei Abtrenneinheiten die Höhe der ersten Stufe zumindest 2/3 der Gesamthöhe des Aggregates und die der zweiten Stufe zumindest 2/9 der Gesamthöhe beträgt.
Bevorzugt ist bzw. sind in jeder Abtrenneinheit eines erfindungsgemäßen mehrstufigen Sortierers im Bereich des maximalen Durchmessers eine oder mehrere Einrichtungen zur Unterbrechung der axialen Strömung, wie oben beschrieben, angeordnet.Preferably, the height of each separation unit is at least twice as large as the sum of the heights of the separation units following the separation unit, ie that in a sorter having three separation units the height of the first stage is at least 2/3 of the total height of the aggregate and that of the second stage at least 2/9 of the total height.
Preferably, in each separation unit of a multistage sorter according to the invention, one or more are in the region of the maximum diameter Arranged to interrupt the axial flow, as described above.

Ebenfalls bevorzugt ist in jeder Abtrenneinheit im Bereich des Rejektauslasses bzw. unterhalb davon zumindest eine Zufuhr für Verdünnungswasser angeordnet.Also preferably, at least one supply for dilution water is arranged in each separation unit in the region of the reject outlet or below it.

Die Zufuhr für Verdünnungswasser kann in der unteren Begrenzung des Rotorsegmentes einer Abtrenneinheit angeordnet sein, sodass das Verdünnungswasser in den Raum unterhalb des Rotorsegmentes (und damit in den Bereich des Rejektauslasses bzw. unterhalb davon) abgegeben wird. Alternativ oder zusätzlich dazu kann die Zufuhr für Verdünnungswasser im oberen Bereich des Rotorsegmentes der nächstfolgenden Abtrenneinheit angeordnet sein.The dilution water feed may be located in the lower boundary of the rotor segment of a separation unit such that the dilution water is discharged into the space below the rotor segment (and thus into the region of the reject outlet and below, respectively). Alternatively or additionally, the supply of dilution water may be arranged in the upper region of the rotor segment of the next following separation unit.

Bei einem mehrstufigen Sortierer gemäß der vorliegenden Erfindung mit mindestens drei Abtrenneinheiten ist bevorzugt zumindest eine Entstippungseinheit, insbesondere am Übergang von der zweiten zur dritten Abtrenneinheit, vorgesehen.In a multistage sorter according to the present invention having at least three separating units, at least one deflaking unit is preferably provided, in particular at the transition from the second to the third separating unit.

Über die zuvor beschriebenen Merkmale hinaus weist der erfindungsgemäße Sortierer bevorzugt eines oder mehrere der Merkmale der in der EP 1 122 358 A2 , der EP 1 124 002 A2 und der EP 1 124 003 A2 beschriebenen Sortierer auf.In addition to the features described above, the sorter according to the invention preferably has one or more of the features in the EP 1 122 358 A2 , of the EP 1 124 002 A2 and the EP 1 124 003 A2 described sorter on.

Im Folgenden werden bevorzugte Ausführungsformen des erfindungsgemäßen Sortierers anhand der Figuren näher erläutert.In the following, preferred embodiments of the sorter according to the invention are explained in more detail with reference to FIGS.

Dabei zeigen:

Figur 1
eine Darstellung eines Sortierers gemäß dem Stand der Technik
Figur 2
eine Darstellung eines mehrstufigen Sortierers gemäß einer bevorzugten Ausführungsform der vorliegenden Erfindung
Figur 3
einen vergrößerten Ausschnitt eines Rejektauslasses des Sortierers gemäß Figur 2
Figur 4
einen vergrößerten Ausschnitt einer alternativen Ausführungsform eines Rejektauslasses
Showing:
FIG. 1
a representation of a sorter according to the prior art
FIG. 2
a representation of a multi-stage sorter according to a preferred embodiment of the present invention
FIG. 3
an enlarged section of Rejektauslasses the sorter according to FIG. 2
FIG. 4
an enlarged section of an alternative embodiment of a Rejektauslasses

Der Sortierer 1 gemäß Figur 1 umfasst in an sich bekannter Weise einen Zulaufstutzen 2, durch welchen eine Faserstoffsuspension zur Reinigung zugeführt wird. Im Bereich des Zulaufes ist ein Einbau 3 vorgesehen, der hier als Kegelstumpf dargestellt ist. Die Faserstoffsuspension tritt in den Raum zwischen den parabelförmigen Rotor 4 und Sieb 5 ein und wird durch das Sieb hindurch in den Akzeptraum 6 gefördert. Das Gehäuse des Akzeptraumes ist in dieser Ausführungsform in an sich bekannter Weise doppelkonisch ausgeführt. Mit der Bezugsziffer 7 ist der Akzeptauslass bezeichnet. Das Rejekt wird über einen Rejektauslass 8 abgeführt.The sorter 1 according to FIG. 1 comprises in a conventional manner an inlet nozzle 2, through which a pulp suspension is fed for cleaning. In the area of the inlet, an installation 3 is provided, which is shown here as a truncated cone. The pulp suspension enters the space between the parabolic rotor 4 and sieve 5 and is conveyed through the sieve into the acceptance space 6. The housing of the accept space is executed in this embodiment in a conventional manner biconical. The reference numeral 7 designates the accept outlet. The reject is removed via a reject outlet 8.

In der Figur 2 sind Vorrichtungen bzw. Vorrichtungsteile, die mit jenen der Ausführungsform des Standes der Technik gemäß Figur 1 identisch sind, mit den gleichen Bezugsziffern bezeichnet. In der bevorzugten Ausführungsform eines erfindungsgemäßen Sortierers gemäß Figur 2 besteht der Sortierer 1 aus drei Abtrenneinheiten 1', 1" und 1"'.In the FIG. 2 are devices corresponding to those of the embodiment of the prior art FIG. 1 are identical, denoted by the same reference numerals. In the preferred embodiment of a sorter according to the invention FIG. 2 the sorter 1 consists of three separation units 1 ', 1 "and 1"'.

Die drei Abtrenneinheiten 1', 1" und 1'" umfassen einen gemeinsamen Rotor, dessen jeweilige Abschnitte 4', 4" und 4"' angepasst an die Strömungsverhältnisse in der jeweiligen Abtrenneinheit parabelförmig bzw. in Form eines Paraboloidstumpfes ausgestaltet sind. Alternativ dazu können die Abschnitte des Rotors auch kegelstumpfförmig bzw. an die Form einer Parabel angenähert ausgestaltet sein.The three separation units 1 ', 1 "and 1'" comprise a common rotor whose respective sections 4 ', 4 "and 4"' are configured parabolically or in the form of a paraboloid stub, adapted to the flow conditions in the respective separation unit. Alternatively, the sections of the rotor may also be frusto-conical or approximated to the shape of a parabola.

Jede Abtrenneinheit weist einen Rejektauslass (9', 9", 9"') auf. Das Rejekt der ersten bzw. zweiten Abtrenneinheit ist dabei gleichzeitig Zulauf für die nächste Abtrenneinheit. Das Rejekt der dritten und letzten Abtrenneinheit wird über den Rejektauslass 8 abgeführt.Each separation unit has a reject outlet (9 ', 9 ", 9"'). The reject of the first or second separation unit is at the same time inlet for the next separation unit. The reject of the third and last separation unit is discharged via the reject outlet 8.

Mit 10 ist in der Figur 2 eine innerhalb des Rotors angeordnete Leitung für Verdünnungswasser bezeichnet, deren Auslässe in der Folge noch näher beschrieben werden.With 10 is in the FIG. 2 a conduit disposed within the rotor for dilution water, the outlets are described in more detail below.

Am Übergang von der zweiten zur dritten Abtrenneinheit ist eine Entstippungseinheit 13 vorgesehen.At the transition from the second to the third separation unit, a deflaking unit 13 is provided.

In den Figuren 3 und 4 sind nunmehr bevorzugte Ausgestaltungen eines Rejektauslasses (in diesem Fall des Rejektauslasses 9') in einer Vergrößerung des in der Figur 2 strich-punktiert angedeuteten Ausschnittes dargestellt.In the FIGS. 3 and 4 are now preferred embodiments of a Rejektauslasses (in this case the Rejektauslasses 9 ') in an enlargement of the in the FIG. 2 dash-dotted lines indicated section.

Gemäß der in Figur 3 dargestellten Ausführungsform sind sowohl gehäuseseitig als auch an den Rotorabschnitten 4' bzw. 4" im Bereich des Rejektauslasses 9' bzw. unterhalb davon Zuführungen für Verdünnungswasser 10a', 10b' und 10c' vorgesehen.According to the in FIG. 3 In the illustrated embodiment, feeds for dilution water 10a ', 10b' and 10c 'are provided both on the housing side and on the rotor sections 4' and 4 "in the region of the reject outlet 9 'and below, respectively.

Die Zuführung 10a' ist in der unteren Begrenzung des Rotorsegmentes 4' der ersten Abtrenneinheit 1' angeordnet. Die Zuführung 10b' ist im oberen Bereich des Rotorsegmentes 4" der zweiten Abtrenneinheit 1" angeordnet. Die Zuführungen 10a' und 10b' können durch eine innerhalb des Rotors angeordnete Leitung 10 (siehe Figur 2) gespeist werden.The feeder 10a 'is arranged in the lower boundary of the rotor segment 4' of the first separation unit 1 '. The feeder 10b 'is arranged in the upper region of the rotor segment 4 "of the second separation unit 1". Feeds 10a 'and 10b' may be defined by a conduit 10 disposed within the rotor (see FIG. 2 ) are fed.

Die Zuführung 10c' ist beispielsweise im Bereich eines Flansches 11 zwischen erster Abtrenneinheit 1' und zweiter Abtrenneinheit 1" angeordnet und wird durch eine nicht dargestellte Leitung gespeist.The feeder 10c 'is arranged, for example, in the region of a flange 11 between the first separation unit 1' and second separation unit 1 "and is fed by a line, not shown.

Mit den Zuführungen für Verdünnungswasser 10a', 10b' und 10c' kann effizient die Konsistenz der in die nächste Abtrenneinheit fließenden Fasersuspension geregelt werden.The dilution water feeds 10a ', 10b' and 10c 'can be used to efficiently control the consistency of the fiber suspension flowing into the next separation unit.

Weiters ist in der Ausführungsform gemäß Figur 3 am unteren Ende des Rotorabschnittes 4' ein Verstellring 12a' angeordnet. Der Verstellring kann, wie oben erläutert, z.B. in Form einer Fotoiris verstellbar angeordnet sein (angedeutet durch den Doppelpfeil). Bevorzugt weist der Außendurchmessers des Verstellringes bzw. seiner Segmente ein zahnförmiges Profil auf.
Mit dem verstellbaren Ring 12a' kann der Durchsatz der axialen Strömung durch den Rejektauslass 9' geregelt werden.Furthermore, in the embodiment according to FIG. 3 at the lower end of the rotor portion 4 'an adjusting 12a' arranged. The adjusting ring can, as explained above, for example in the form of a Fotoiris be arranged adjustable (indicated by the double arrow). The outer diameter of the adjusting ring or its segments preferably has a tooth-shaped profile.
With the adjustable ring 12a ', the flow rate of the axial flow through the reject outlet 9' can be regulated.

Die in der Figur 4 dargestellte Ausführungsform des Rejektauslasses 9' unterscheidet sich von der Ausführungsform gemäß Figur 3 darin, dass zusätzlich zum Verstellring 12a' ein Strömungsunterbrecherring 12b' gehäuseseitig ange-ordnet ist. Im Strömungsunterbrecherring 12b' ist weiters die gehäuseseitige Zuführung 10c' für Verdünnungswasser angeordnet, d.h. die Zuführung für Verdünnungswasser und der Strömungsunterbrecherring sind miteinander gekoppelt. Selbstverständlich können auch in der Ausführungsform gemäß Figur 4 weitere Zuführungen für Verdünnungswasser am Rotor, wie in Figur 3 dargestellt, vorgesehen sein.The in the FIG. 4 illustrated embodiment of Rejektauslasses 9 'differs from the embodiment according to FIG. 3 in that in addition to the adjusting ring 12a ', a flow interrupting ring 12b' is arranged on the housing side. In the flow breaker ring 12b ', the housing side feeder 10c' for dilution water is further arranged, ie, the dilution water supply and the flow breaker ring are coupled together. Of course, in the embodiment according to FIG. 4 further feeds for dilution water on the rotor, as in FIG. 3 represented, be provided.

Claims (18)

  1. Screen (1) for cleaning a fibre suspension, comprising
    a housing
    a rotor (4', 4", 4"')
    a screen basket (5) and
    an accept chamber (6),
    characterised in that it comprises two or several separating units (1', 1", 1"') arranged one after the other, where all separating units comprise a joint rotor (4', 4", 4"') with parabolic, or parabolic-segment, shape of maximum diameter, adapted to the flow conditions in the separating unit concerned, each separating unit has a reject outlet (9', 9", 9"'), with the reject from the separating unit (1', 1", 1"') thus forming the feed for the next separating unit (1", 1"') and being discharged from the last separating unit,
    where
    the reject outlets (9', 9", 9"'), are arranged in the separating unit concerned in the area of the maximum diameter of the rotor (4', 4", 4"'), and where in the area of the reject outlet (9', 9", 9''') of at least one separating unit (1', 1", 1'''), at least one feed (10a', 10b', 10c') for dilution water is arranged, in particular directly below the reject outlet (9', 9", 9"').
  2. Screen according to Claim 1, characterised by at least one feed (10c') for dilution water being located at the housing of the separating unit or at the screen basket (5).
  3. Screen according to Claim 1 or 2, characterised by at least one feed (10a', 10b') for dilution water being located at the rotor (4', 4", 4"') and fed through a pipe (10) mounted inside the rotor (4', 4", 4"').
  4. Screen according to one of Claims 1 to 3, characterised by at least one feed (10a', 10b', 10c') for dilution water being directed such that the dilution water can be fed in the running direction of the rotor (4', 4", 4"').
  5. Screen according to one of Claims 1 to 3, characterised by at least one feed (10a', 10b', 10c') for dilution water being directed such that the dilution water can be fed in the opposite direction of the running direction of the rotor (4', 4", 4"').
  6. Screen according to one of the preceding Claims, characterised by one or several devices (12a', 12b') to interrupt the axial flow being located in the area of the maximum diameter of the rotor (4', 4", 4''').
  7. Screen according to Claim 6, characterised by the device or at least one of the devices (12b') to interrupt the axial flow being located at the housing of the separating unit or at the screen basket (5).
  8. Screen according to Claim 6 or 7, characterised by the device or at least one of the devices (12a') to interrupt the axial flow being located at the rotor (4', 4", 4"').
  9. Screen according to one of the preceding Claims, characterised by at least one axial flow interruption ring (12a', 12b') being provided as device to interrupt the axial flow.
  10. Screen according to Claim 9, characterised by the flow interruption ring or at least one of the flow interruption rings (12a', 12b') being adjustable, e.g. in the same way as an iris diaphragm.
  11. Screen according to Claim 9 or 10, characterised by the outer diameter of the flow interruption ring or at least of one of the flow interruption rings (12a', 12b') having a toothed profile.
  12. Screen according to one of Claims 6 to 11, characterised by at least one feed (10c') for dilution water being coupled to a device for interrupting the axial flow (12b').
  13. Screen according to one of the preceding Claims, characterised by a separating unit (1', 1", 1"') having a deflaking unit (13).
  14. Screen according to Claim 13, characterised by the deflaking unit (13) taking the form of one or several rings located at the housing or screen basket (5) and/or at the rotor (4', 4", 4"').
  15. Screen according to one of the Claims 1 to 14, characterised by the height of the separating unit (1', 1 ", 1"') in question being at least twice the sum of the heights of all separating units adjoining the separating unit in question.
  16. Screen according to one of the preceding Claims, characterised by one or several devices (12a', 12b'), being located in each separating unit (1', 1", 1"') in the area of the maximum rotor (4', 4", 4"') diameter, to interrupt the axial flow.
  17. Screen according to one of Claims 1 to 16, characterised by at least one feed (10a', 10b', 10c') for dilution water being located in each separating unit (1', 1", 1''') in the area of the reject outlet (9', 9", 9"'), in particular below it.
  18. Screen according to one of the Claims 1 to 17 with at least three separating units (1', 1", 1"'), characterised by at least one deflaking unit (13) being provided, preferably at the transition from the second (1") to the third (1"') separating units.
EP04006304A 2003-03-27 2004-03-17 Screen for purification of fibrous pulp Expired - Lifetime EP1462567B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0048503A AT413390B (en) 2003-03-27 2003-03-27 SORTER FOR CLEANING A FIBER SUSPENSION
AT4852003 2003-03-27

Publications (2)

Publication Number Publication Date
EP1462567A1 EP1462567A1 (en) 2004-09-29
EP1462567B1 true EP1462567B1 (en) 2009-08-19

Family

ID=32777540

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04006304A Expired - Lifetime EP1462567B1 (en) 2003-03-27 2004-03-17 Screen for purification of fibrous pulp

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US (1) US20040195169A1 (en)
EP (1) EP1462567B1 (en)
CN (1) CN100422437C (en)
AT (2) AT413390B (en)
BR (1) BRPI0401090B1 (en)
CA (1) CA2459601A1 (en)
DE (1) DE502004009907D1 (en)
NO (1) NO20041101L (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013515868A (en) * 2009-12-25 2013-05-09 フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング Method and screen device for sorting fiber material suspensions
JP7416589B2 (en) * 2019-09-04 2024-01-17 フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング multi-stage screen

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Publication number Priority date Publication date Assignee Title
US817333A (en) * 1905-08-07 1906-04-10 Hjalmar L Orrman Centrifugal sieving apparatus.
US4268381A (en) 1979-05-03 1981-05-19 Uniweld Inc. Rotary pulp screening device of the vertical pressure type
US4267035A (en) * 1979-08-27 1981-05-12 The Black Clawson Company Pressurized rotary screening apparatus
CA1238604A (en) * 1983-12-12 1988-06-28 Anthony W. Hooper Rotary pulp screen of the vertical pressure type having pulp stock feed at different axial positions on the screen
US4697982A (en) 1986-03-13 1987-10-06 Uniweld Inc. Rotary pulp screen of the horizontal type having pulp stock feed at different axial positions on the screen
US5119953A (en) * 1990-04-02 1992-06-09 Celleco Hedemora Ab Pulp suspension screening and fractionation apparatus
US5096127A (en) * 1990-08-22 1992-03-17 Ingersoll-Rand Company Apparatus for pressurized screening of a fibrous material liquid suspension
JP3065202B2 (en) * 1993-10-20 2000-07-17 石川島播磨重工業株式会社 Waste Paper Pulp Sorting Method and Apparatus
SE509134C2 (en) * 1997-04-14 1998-12-07 Sunds Defibrator Ind Ab Screening device with reject dilution
SE509289C2 (en) * 1997-04-14 1999-01-11 Sunds Defibrator Ind Ab Screening device with rejection throttle
SE511142C2 (en) 1997-12-19 1999-08-09 Sunds Defibrator Ind Ab Device with diluent supply for screening of fiber suspensions
FR2790270B1 (en) * 1999-02-26 2001-11-16 Lamort E & M PROCESSES AND MEANS FOR FILTERING PULP
AT408771B (en) 2000-02-03 2002-03-25 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
AT408770B (en) 2000-02-03 2002-03-25 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
AT408772B (en) 2000-02-03 2002-03-25 Andritz Ag Maschf SORTER FOR CLEANING A FIBER SUSPENSION
US6571957B1 (en) * 2000-08-07 2003-06-03 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension

Also Published As

Publication number Publication date
BRPI0401090B1 (en) 2014-03-25
CA2459601A1 (en) 2004-09-27
EP1462567A1 (en) 2004-09-29
CN1542219A (en) 2004-11-03
ATA4852003A (en) 2005-07-15
ATE440170T1 (en) 2009-09-15
NO20041101L (en) 2004-09-28
CN100422437C (en) 2008-10-01
US20040195169A1 (en) 2004-10-07
AT413390B (en) 2006-02-15
BRPI0401090A (en) 2005-04-26
DE502004009907D1 (en) 2009-10-01

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