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WO2011076660A1 - Procédé et dispositif de tamisage pour le tamisage d'une suspension de matière fibreuse - Google Patents

Procédé et dispositif de tamisage pour le tamisage d'une suspension de matière fibreuse Download PDF

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Publication number
WO2011076660A1
WO2011076660A1 PCT/EP2010/069888 EP2010069888W WO2011076660A1 WO 2011076660 A1 WO2011076660 A1 WO 2011076660A1 EP 2010069888 W EP2010069888 W EP 2010069888W WO 2011076660 A1 WO2011076660 A1 WO 2011076660A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
space
screening device
reject
pulp suspension
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.)
Ceased
Application number
PCT/EP2010/069888
Other languages
German (de)
English (en)
Inventor
Junichi Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to EP10798760A priority Critical patent/EP2516733A1/fr
Priority to JP2012545243A priority patent/JP2013515868A/ja
Priority to CN2010800648137A priority patent/CN102782213A/zh
Publication of WO2011076660A1 publication Critical patent/WO2011076660A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums
    • D21D5/08—Rotary screen-drums combined with a rocking movement

Definitions

  • the invention relates to a method for screening a pulp suspension
  • a sieve device with at least one in a housing
  • a screen chamber surrounding a screen basket is provided, the one
  • Fibrous suspension rejected at the screen openings and at least partially discharged as a reject from the screening device Fibrous suspension rejected at the screen openings and at least partially discharged as a reject from the screening device.
  • the invention also relates to a screening device, in particular for carrying out the method with at least one inserted in a housing, a
  • Pulp suspension which is rejected at the screen openings, at least one Rejektauslass is present, with at least one Sieb thriftr is in the screen space, which has a driven rotor body with clearing elements.
  • Processes of this type are used in the treatment of paper fiber suspensions to treat the pulp suspension in a wet sieving.
  • a suitable screening device is called in the paper and pulp industry mostly “pressure sorter”. It contains at least one screen basket, which is provided with a plurality of openings. The fibers contained in the suspension
  • a centrifugal procedure is used in which the suspension passes radially from the inside to the outside of the screen openings.
  • Sorting holes are usually round holes or slots. Pressure graders of the type considered here are equipped with sieve scrapers, which are close to the
  • Sieve basket have past movable rake elements. As a result, clogging of the screen openings is prevented in a manner known per se.
  • the Siebierr is designed as a rotor, which is usually mounted concentrically to the screen basket.
  • the release effect of a pressure sorter is due to the fact that at least a portion of the impurities contained in the paper pulp suspension fed can not pass through the screen, so it is separated due to the size, shape or flexibility of the paper fibers.
  • pressure sorters are known in which additionally aimed at the density of the impurities separation is made by the different forces used in a centrifugal field of the impurities are used. Although a large part of the heavy parts would not pass through the screen openings usually used, so be rejected there, but there is a risk of damage or wear when they come into contact with the sieve.
  • Fiber treatment but is due essentially to hydraulic losses in the device.
  • the invention is based on the object to reduce the cost of construction and operation of the screening device and / or to improve the efficiency of the process. In this case, a better efficiency can mean a higher acreage purity and / or a lower fiber loss due to residual fibers in the reject.
  • Claims 10 to 20 relate to advantageous screening devices for carrying out the method.
  • the physical conditions within the screening device are further uniformed. It is considered that unequal physical conditions, in particular
  • Ad 1 The pulp suspension fed into the sieve device is constantly depleted of water and fibers along its way along the sieve, which means that consistency and dirt load increase. The result is a relatively high flow rate at the beginning of the wet sieving process with higher
  • the invention for the first time provides a solution to this problem by providing hydraulic means for uniform distribution over the circumference. This can be achieved by first passing the suspension through the inlet nozzle in an annular space and then through a constriction, in particular a throttle gap extending over the circumference (about 360 °) in which the flow is accelerated and thus advantageously is designed that in it the
  • Gutstoffauslaufstutzen occurs. Particularly advantageous is the combination of both constrictions, ie both in the inlet and in the process.
  • Circumference has to be guided around the screen basket, which is for the
  • the size of the screen surface which affects not only the screen costs but also the size of the screen device, can be reduced without loss of efficiency. This means savings in the cost of the screening device and energy consumption. If, however, an increase in Effective separation efficiency, this can be achieved with the same size of the screen surface. to 3.) If, as described in point 2.) described, to distribute the currents evenly over the circumference, then the composition of the
  • Fig. 1 shown schematically in side view, a sorting device for carrying out the method according to the invention
  • FIG. 2 shows a variant of the sorting device shown in FIG. 1;
  • Fig. 3 shows an advantageous dissolution zone for reject processing within the
  • Fig. 5 shows a special Rejektraum, shown cut in plan view
  • FIG. 6 shows another sorting device with axial conveyor for the reject return;
  • FIG. 7 shows a special embodiment with a bottom reject outlet;
  • FIG. 1 A typical embodiment of the method according to the invention with a corresponding sieve device is shown in FIG. 1.
  • the sieve device contains in a housing a cylindrical strainer basket 1 which surrounds a sieve compartment 5.
  • the center line is vertical in position of use.
  • the method can also be carried out with non-perpendicular screening devices, for. B: in a horizontal sorter.
  • the pulp suspension S to be screened is introduced laterally into the housing through an inlet 8, ie it flows in an asymmetrical manner. She first enters the annular inlet chamber 4, from which they radially inwardly through the throttle gap 6 in the Screening chamber 5 is pumped.
  • the advantageous effect of this constriction has already been described.
  • Gutstoffauslasses 10 can be arbitrarily selected on the circumference, which z. B. facilitates the vote on the specific installation situation.
  • the flow of the suspension from the screen space 5 into the accepts space 3 can be carried along the way along the strainer basket 1.
  • This can be achieved by a conical shape of the corresponding walls in the same direction: they can e.g. be parallel to each other as shown here.
  • Such a designed screening device can be smaller overall and thus cheaper and have lower hydraulic losses, so get along with less energy for the same technological result.
  • the rejected on the strainer basket 1 part of the suspension, in particular the contaminants, is collected in the above the screen basket 1 Rejektraum 15, in the a rotational flow is formed. They are partly removed via Rejektauslass 16 as reject R ' from the housing 2 and partly recirculated as a reject return R " through the hollow interior of the open-topped rotor body 1 1 in the screen room 5.
  • the overhead position of the Rejektraumes 15 facilitates the withdrawal of Air and light parts (eg Styrofoam) together with the reject R '
  • a venting line in the lid of the housing can be saved.
  • the reject R ' derived from the housing is, if necessary, resorted to avoid fiber losses ,
  • the rotor body 1 1 is driven for rotation.
  • other rotors for. B. with directly mounted on the rotor body clearing elements are used.
  • a mixture of contaminants and residual fibers is fed back to the screening process through the reject return R " , thereby giving the residual fibers a further possibility, as intended, to reach the accept, which is advantageously achieved by the position of the distribution openings 18, 19 in the rotor body 1 1 chosen so that the reject-return R " enters the sieve area, which treats the freshly added fiber suspension S.
  • a decisive advantage of this type of internal reject return R " lies in the fact that a stream which is uniformly distributed over the entire circumference is formed and can then be guided in a targeted manner into a less loaded part of the screen basket 1.
  • the screen chamber 5 has at its uppermost part a central port 17 through which z.
  • dilution water W may be mixed into the reject return R "
  • the dilution water flow may enhance the axial transport of the reject return R " , especially if the central port 17 is tight on the rotor body 1 1 or within the rotor body 1 1 opens.
  • Dilution water W is then targeted to the rejected reject R '
  • the central socket 17 is then carried out flush with the lid of the device.
  • Fig. 2 The recovery of residual fibers from reject reject R " can be significantly improved if the reject is further disintegrated or defibrated prior to re-screening, ie when fiber agglomerates and specks are comminuted, resulting in more fibers passing through the screen apertures Dissolution step is indicated in Fig. 2.
  • a dissolving zone 20 is established, in which due to the relative movement between the rotor body 1 1 and housing breakup
  • a favorable embodiment of the dissolving zone 20 is shown in somewhat greater detail in Fig. 3.
  • Rotor ring 24 connected to the housing and one connected to the rotor body 11 are shown Rotor ring 24, the distributed over the circumference for dissolution depressions, in particular s stage-like pockets 25 and 26 have. These have z. B. a depth T between 1 and 20 mm. Rotor ring 24 and stator ring 25 face each other at a distance, so that a gap forms between them, through which pass the substances rejected on the screen basket 1, wherein fiber agglomerates and specks are at least partially dissolved.
  • Rotor ring 24 and stator 25 detachable, for example, fastened with screws to easily replace them. This may be necessary because of wear, or serve to set a different resolution intensity.
  • Rejection is usually a compromise between desired
  • Fiber recovery and unwanted pulp shredding are a processing by shear forces, in which no fiber damage occurs.
  • Thinning intensity can also be affected by the number and geometry of the pockets. 4 shows another example of a dissolution zone. Rotor ring 24 ' and
  • Stator ring 25 ' are arranged here so that they intermesh and thereby transmit more pulses to the specks. They can be provided with pockets, grooves or a closed rough surface.
  • rotor and stator ring may be provided with teeth which are moved past each other at a distance.
  • the screen openings 28 in the strainer 1 are shown as examples only as round holes, it can, for. B. slots with a width between 0.1 and 0.4 mm, preferably between 0.15 and 0.25 mm or round holes with a diameter between 1 to 2 mm. This choice depends heavily on the raw material.
  • the method also offers the possibility of feeding rejects R ''' coming from other separation processes to the screening process.
  • rejects R ''' may originate from other screening devices (reject discharge or venting) or hydrocyclones.
  • the reject of another, preferably downstream Drucksortierers flow through a direct line into the central socket 17. It is possible, the reservoir for these rejects R '"
  • the Rejektraum 15 is slightly higher in Fig. 2 than in Figure 1 and has a central Verdfiter stresses 21 on. As a result, the rotational flow can be better maintained in this room, in particular dead spaces and unnecessary vortex are avoided.
  • the inlet space 4 ' can be placed below the screen space 5 as shown in FIG. 2.
  • the bearing housing 23 of the rotor body 1 1 is in the center of the inlet chamber 4 ' , which avoids dead spaces and unnecessary vortex and also saves space.
  • the throttle gap 6 ' can then be a flat annular gap.
  • Fig. 5 is a plan view of a sorting device according to the invention in section through the Rejektraum 15 is shown schematically and not completely.
  • the rotational flow in the reject space 15 is braked by a barrier 29 and directed into the reject outlet 16. This too can reduce energy consumption.
  • the cut is placed so that the stator ring 25 and the pockets 26 (only a few drawn) of the dissolving zone 20 are visible.
  • an axial conveyor can be used, which is illustrated in an example in Fig. 6.
  • a helical coil 30 is centrally located in the rotor body 11 Axialkraft generated
  • ermudl 30, as shown here co-rotate or fixed, z. B. attached to the lid. It is also advantageous to attach the axial conveyor with screws to replace it when z. B. another conveying effect is desired. The rotor change is easier.
  • FIG. 7 shows a screening device in which the flow in the region of the screen basket 1 is guided from top to bottom.
  • the reject R ' leaves the housing through a downstream reject outlet 16, while the reject reflux R " rises upward through the rotor body 11 after being processed in the dissolving zone 20. It can then enter the sieve compartment 5 again Arrangement, the strainer 1 is easily accessible from above, which is an advantage when replacing.
  • FIG. 8 shows an example in which the principle of achieving equalization of the flow over the circumference by means of one or two constrictions is shown in FIG

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

Abstract

L'invention concerne un procédé permettant le tamisage d'une suspension de matière fibreuse (S) au moyen d'un dispositif de tamisage, en particulier d'une trieuse sous pression. Ce dispositif de tamisage est doté d'au moins un panier tamiseur (1) placé dans un logement et entourant un espace de tamisage (5). Une partie de la suspension de matière fibreuse (S) amenée dans l'espace de tamisage (5) traverse les ouvertures du tamis et arrive en tant que matière acceptée (A) dans un espace pour matière acceptée (3), alors qu'une autre partie de la suspension de matière fibreuse (S) est refusée en tant que matière rejetée au niveau des ouvertures du tamis. Dans une forme de réalisation particulièrement favorable, une partie de la matière rejetée est recyclée sous forme de reflux de matière rejetée (R'') dans l'espace de tamisage (5) et arrive de nouveau dans la zone des ouvertures du tamis. Comme autres améliorations, on propose des mesures pour uniformiser la vitesse d'écoulement, en particulier sur le pourtour.
PCT/EP2010/069888 2009-12-25 2010-12-16 Procédé et dispositif de tamisage pour le tamisage d'une suspension de matière fibreuse Ceased WO2011076660A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP10798760A EP2516733A1 (fr) 2009-12-25 2010-12-16 Procédé et dispositif de tamisage pour le tamisage d'une suspension de matière fibreuse
JP2012545243A JP2013515868A (ja) 2009-12-25 2010-12-16 繊維材料懸濁液を選別するための方法及びスクリーン装置
CN2010800648137A CN102782213A (zh) 2009-12-25 2010-12-16 用于筛分纤维悬浊液的方法和筛分设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009295032 2009-12-25
JP2009-295032 2009-12-25

Publications (1)

Publication Number Publication Date
WO2011076660A1 true WO2011076660A1 (fr) 2011-06-30

Family

ID=43479404

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/069888 Ceased WO2011076660A1 (fr) 2009-12-25 2010-12-16 Procédé et dispositif de tamisage pour le tamisage d'une suspension de matière fibreuse

Country Status (5)

Country Link
EP (1) EP2516733A1 (fr)
JP (1) JP2013515868A (fr)
KR (1) KR20120099137A (fr)
CN (1) CN102782213A (fr)
WO (1) WO2011076660A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083509A1 (fr) * 2011-12-09 2013-06-13 Voith Patent Gmbh Dispositif de tamisage pour le tamisage d'une suspension fibreuse
WO2014042010A1 (fr) * 2012-09-13 2014-03-20 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 Dispositif d'écran pour matière première de fabrication de papier
CN105256638A (zh) * 2015-11-20 2016-01-20 山东杰锋机械制造有限公司 纸浆悬浮液高效筛选装置
US20220349124A1 (en) * 2021-04-30 2022-11-03 Andritz (China) Ltd. Pressure Screen and Method for Dilution for a Pressure Screen

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013216433A1 (de) * 2013-08-20 2015-03-12 Voith Patent Gmbh Drucksortierer
CN105696400B (zh) * 2015-03-26 2018-04-03 潍坊信合达机械有限公司 一种造纸业用复合式压力筛
FI126520B (en) * 2016-03-16 2017-01-31 Red Wire Oy Method of screening and screening device
DE102018133114A1 (de) * 2018-12-20 2020-06-25 Voith Patent Gmbh Mahlanordnung
CN115430319A (zh) * 2022-08-15 2022-12-06 什邡市长丰化工有限公司 一种不带入无效杂质进入水剂肥料中的配制方法

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE623991C (de) * 1931-11-22 1936-01-09 J M Voith Fa Liegender Schleudersortierer fuer Holzstoff, Zellstoff u. dgl.
US4571298A (en) * 1983-10-11 1986-02-18 Hermann Finckh Maschinenfabrik Gmbh & Co. Sorting screen
DE9201856U1 (de) * 1992-02-14 1992-04-02 J.M. Voith Gmbh, 7920 Heidenheim Sortierer
WO1994005852A1 (fr) * 1992-09-10 1994-03-17 A. Ahlstrom Corporation Procede et dispositif de traitement de pulpe
US5597075A (en) * 1993-10-20 1997-01-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
WO1997041296A1 (fr) * 1996-05-02 1997-11-06 Alfa Laval Ab Dispositif pour separer les contaminants de pates constituees par des fibres en suspension
US5798025A (en) * 1997-03-13 1998-08-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
EP0933468A2 (fr) * 1998-02-03 1999-08-04 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Procédé et dispositif pour l' épuration d' une pulpe de vieux papiers
EP1184509A1 (fr) * 2000-08-07 2002-03-06 Voith Paper Patent GmbH Classeur pour suspension fibreuse
EP1462567A1 (fr) * 2003-03-27 2004-09-29 Andritz AG Classeur pour la purification d'une suspension fibreuse
DE10331683B3 (de) * 2003-07-14 2004-10-14 Voith Paper Patent Gmbh Verfahren und Siebapparat zum Sortieren einer verschmutzten Papierfasersuspension
DE102004051887B3 (de) * 2004-10-26 2005-12-22 Voith Paper Patent Gmbh Drucksortierer zum Sieben einer Faserstoffsuspension

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE623991C (de) * 1931-11-22 1936-01-09 J M Voith Fa Liegender Schleudersortierer fuer Holzstoff, Zellstoff u. dgl.
US4571298A (en) * 1983-10-11 1986-02-18 Hermann Finckh Maschinenfabrik Gmbh & Co. Sorting screen
DE9201856U1 (de) * 1992-02-14 1992-04-02 J.M. Voith Gmbh, 7920 Heidenheim Sortierer
WO1994005852A1 (fr) * 1992-09-10 1994-03-17 A. Ahlstrom Corporation Procede et dispositif de traitement de pulpe
US5597075A (en) * 1993-10-20 1997-01-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
WO1997041296A1 (fr) * 1996-05-02 1997-11-06 Alfa Laval Ab Dispositif pour separer les contaminants de pates constituees par des fibres en suspension
US5798025A (en) * 1997-03-13 1998-08-25 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
EP0933468A2 (fr) * 1998-02-03 1999-08-04 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Procédé et dispositif pour l' épuration d' une pulpe de vieux papiers
EP1184509A1 (fr) * 2000-08-07 2002-03-06 Voith Paper Patent GmbH Classeur pour suspension fibreuse
EP1462567A1 (fr) * 2003-03-27 2004-09-29 Andritz AG Classeur pour la purification d'une suspension fibreuse
DE10331683B3 (de) * 2003-07-14 2004-10-14 Voith Paper Patent Gmbh Verfahren und Siebapparat zum Sortieren einer verschmutzten Papierfasersuspension
DE102004051887B3 (de) * 2004-10-26 2005-12-22 Voith Paper Patent Gmbh Drucksortierer zum Sieben einer Faserstoffsuspension

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083509A1 (fr) * 2011-12-09 2013-06-13 Voith Patent Gmbh Dispositif de tamisage pour le tamisage d'une suspension fibreuse
WO2014042010A1 (fr) * 2012-09-13 2014-03-20 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 Dispositif d'écran pour matière première de fabrication de papier
CN105256638A (zh) * 2015-11-20 2016-01-20 山东杰锋机械制造有限公司 纸浆悬浮液高效筛选装置
US20220349124A1 (en) * 2021-04-30 2022-11-03 Andritz (China) Ltd. Pressure Screen and Method for Dilution for a Pressure Screen
US11926961B2 (en) * 2021-04-30 2024-03-12 Andritz (China) Ltd. Pressure screen and method for dilution for a pressure screen

Also Published As

Publication number Publication date
KR20120099137A (ko) 2012-09-06
JP2013515868A (ja) 2013-05-09
EP2516733A1 (fr) 2012-10-31
CN102782213A (zh) 2012-11-14

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