EP0318756B1 - Procédure et dispositif pour décendrage - Google Patents

Procédure et dispositif pour décendrage Download PDF

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Publication number
EP0318756B1
EP0318756B1 EP88119061A EP88119061A EP0318756B1 EP 0318756 B1 EP0318756 B1 EP 0318756B1 EP 88119061 A EP88119061 A EP 88119061A EP 88119061 A EP88119061 A EP 88119061A EP 0318756 B1 EP0318756 B1 EP 0318756B1
Authority
EP
European Patent Office
Prior art keywords
sieve
vibration
suspension
fibre
vibrations
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
EP88119061A
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German (de)
English (en)
Other versions
EP0318756A1 (fr
Inventor
Knut Sauerbrey
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.)
JM Voith GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT88119061T priority Critical patent/ATE72589T1/de
Publication of EP0318756A1 publication Critical patent/EP0318756A1/fr
Application granted granted Critical
Publication of EP0318756B1 publication Critical patent/EP0318756B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/18—Shaking apparatus for wire-cloths and associated parts
    • D21F1/20—Shaking apparatus for wire-cloths and associated parts in Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/40—Washing the fibres
    • 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
    • D21D5/04—Flat screens

Definitions

  • the invention relates to a method for ash removal from suspensions, in particular fiber suspensions from the paper industry, and devices for ash removal.
  • the known ash removal device uses a certain flow rate of the fiber suspension passed over a screen which is more or less inclined towards the horizontal in order to utilize the filter network effect formed by the formation of mats in the fibers for separating fine materials and thus ash removal.
  • the addition of rinse water from above can result in a further increased separation of the fine substances.
  • the centrifugal effect on the fiber suspension which is guided in the form of an arc between two sieves around a central, perforated dewatering drum is used to separate water and fine substances contained therein.
  • the suspension is transferred from a feed device via a channel with a slot-shaped outlet opening into the one between the two the drum led sieves formed gap initiated as a narrow beam.
  • liquid and fine substances are discharged radially inward into the interior of the drum due to the pressure prevailing between the sieves.
  • these two mechanisms of action contradict each other, and this arrangement is relatively complex due to the two screens and the central drainage drum.
  • the object of the invention is to construct a device for ash removal with high efficiency with only one sieve.
  • the method is preferably carried out according to claim 3.
  • Vibration devices are already known from the so-called vibration sorters. However, only the coarse material, ie the coarse dirt, was separated with these sorters. Such vibration exciters are known from FR patent specification 1,085,876 and US patent specification 2,016,006. Vibration sorters with an inclined screen surface are known from US patent specification 36 42 133 and US patent specification 3,616,905.
  • vibration devices mentioned can also be used in the ash removal device according to the invention.
  • the embodiment according to FIG. 1 has a feeding device 11, in which the outlet is arranged horizontally or approximately parallel to the upper run of the screen 2, and which ends in a slot nozzle 21. As a result, the suspension is applied to the screen 2 in a flat layer.
  • the vibration exciters which can be designed as already indicated above and are vibrationally coupled to the screen 2 by means of a slide shoe 9.
  • the fiber suspension is carried along as a thin layer M by the sieve.
  • the sliding shoes 9 are supported on the lateral machine beams 5 by means of springs 4.
  • the excitation frequency of the vibration systems is preferably between 20 and 60, in particular 30 and 45 Hz.
  • the layer thickness of the fiber suspension on the sieve is between 1 1/2 and 2 mm.
  • the mesh size of the sieve is selected depending on the fine material content and is between 12 and 24 meshes per cm2.
  • the vibration exciters can preferably also be sound pressure devices 22 which operate by means of an electromagnetically excited membrane and which are arranged in a row or several rows across the screen 2. This also makes it easier to adapt the frequency e.g. possible with regard to resonance.
  • a screen 2 which consists of a flexible screen fabric, is passed over an inflow-side drainage drum with a perforated jacket and deflecting rollers 16 and 18.
  • the suspension preferably a fiber suspension from the paper industry, is fed onto the screen in the area of the dewatering drum 14 by means of the feed device 12.
  • the upper run of the screen moves away from this feed device 12 in the illustration to the right, whereby it is guided via vibration devices 3, as can be seen in FIGS. 2 and 3, and suction devices 7, which are designed as so-called foils and which alternate one after the other.
  • the fiber suspension is drained to a large extent in the area of the suction devices 7, the fine substances being removed with the filtrate.
  • the dewatering drum 14 can circulate in a bath 13 made of fiber suspension, in which the liquid already separated in the dewatering drum collects.
  • the screen can be operated at a relatively low speed between 5 and 100 m / min, preferably between 10 and 50 m / min.
  • the liquid separated in the dewatering drum can also be collected by a collecting trough 15 arranged inside the drum.
  • Fig. 4 it is also shown that by means of nozzles 29 connected to a dilution water line 28, spray water of a spray pressure of approximately 10 bar can be sprayed onto the sieve in the area of the vibration excitation systems 3 in order to wash out the fine substances even more.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Processing Of Solid Wastes (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Paper (AREA)

Claims (12)

1. Procédé de séparation des cendres à partir de suspensions de fibres utilisées dans l'industrie papetière, selon lequel on dépose d'abord une couche mince de la suspension sur une surface de toile filtrante tendue, guidée d'une manière pratiquement libre et se déplaçant au maximum suivant une trajectoire faiblement incurvée, caractérisé en ce qu'en des emplacements espacés et se succédant suivant la direction de déroulement de la trajectoire et sur des zones s'étendant transversalement à la surface de la toile filtrante, on met cette dernière en oscillations entre 18 et 150 Hz.
2. Procédé suivant la revendication 1, caractérisé en ce qu'on met la surface de la toile filtrante en oscillations entre 25 et 60 Hz suivant le direction perpendiculaire à cette surface.
3. Procédé suivant l'une des revendications 1 et 2, caractérisé en ce que la production des oscillations est due à l'excitation d'une membrane par voie magnétique ou hydraulique, notamment est provoquée par une pression acoustique.
4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce qu'en aval et/ou en amont d'au moins l'un des emplacements de la production des oscillations et sur des zones s'étendant aussi transversalement à la surface de la toile filtrante et à la direction de déroulement de la trajectoire, une action d'aspiration est exercée vers le bas sur la suspension de fibres se trouvant sur la surface de la toile filtrante.
5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que les constituants formés de cendres sont séparés de la toile filtrante vers le bas par lavage au moyen d'eau de dilution amenée par le haut.
6. Dispositif de séparation des cendres ou de lavage d'une suspension de fibres, qui comprend une toile filtrante continue (2), recevant la suspension de fibres sous la forme d'un voile mince de fibres, un dispositif d'alimentation (11, 12), délivrant la suspension de fibres sur cette toile filtrante, et des dispositifs d'aspiration disposés au-dessous de la toile filtrante, caractérisé en ce qu'il est en outre disposé, au-dessous de la toile filtrante et d'une manière alternée suivant la direction de déplacement de cette dernière, des dispositifs d'aspiration (7) et des dispositifs d'excitation (3) qui mettent la toile filtrante (2) en oscillations par zones.
7. Dispositif suivant la revendication 6, caractérisé par un tambour d'extraction d'eau (14), perforé et situé du côté d'entrée, sur une partie duquel la toile filtrante (2) s'enroule.
8. Dispositif suivant la revendication 7, caractérisé en ce que le tambour d'extraction d'eau (14) est disposé de façon à barboter dans un bac (13) de suspension de fibres.
9. Dispositif suivant l'une des revendications 6 ou 8, caractérisé en ce que le dispositif d'alimentation (11) comporte une ouverture de sortie (21) en forme de fente au-dessus de la toile filtrante, de sorte que le jet de suspension est envoyé sur la toile filtrante d'une manière pratiquement parallèle à cette dernière ou sous un faible angle d'inclinaison par rapport à elle.
10. Dispositif suivant l'une des revendications 7 à 9, caractérisé en ce que la distance entre les milieux des emplacements d'excitation du mouvement d'oscillation de la toile filtrante est à peu près chaque fois comprise entre 40 et 80 cm.
11. Dispositif suivant l'une des revendications 6 à 10, caractérisé en ce que les générateurs d'oscillations sont agencés pour fonctionner à des fréquences comprises entre 80 et 150 Hz.
12. Disposifif suivant la revendication 11, caractérisé en ce que les générateurs d'oscillations sont agencés pour fonctionner à des fréquences comprises entre 25 et 60 Hz.
EP88119061A 1987-11-28 1988-11-17 Procédure et dispositif pour décendrage Expired - Lifetime EP0318756B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88119061T ATE72589T1 (de) 1987-11-28 1988-11-17 Verfahren und einrichtung zur entaschung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3740480 1987-11-28
DE19873740480 DE3740480A1 (de) 1987-11-28 1987-11-28 Verfahren und einrichtungen zur entaschung

Publications (2)

Publication Number Publication Date
EP0318756A1 EP0318756A1 (fr) 1989-06-07
EP0318756B1 true EP0318756B1 (fr) 1992-02-12

Family

ID=6341539

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88119061A Expired - Lifetime EP0318756B1 (fr) 1987-11-28 1988-11-17 Procédure et dispositif pour décendrage

Country Status (4)

Country Link
EP (1) EP0318756B1 (fr)
AT (1) ATE72589T1 (fr)
BR (1) BR8806282A (fr)
DE (2) DE3740480A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022110B4 (de) * 2000-05-08 2007-10-25 Dieter Ronnenberg Beeinflussung eines Bahneigenschafts-Profiles mittels mindestens eines Schallfeldes
DE102009051825A1 (de) * 2009-11-04 2011-05-05 Röhren- und Pumpenwerk Bauer GmbH Waschseparator zur Trennung von Fasern und Füllstoffen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE610020C (de) * 1933-07-06 1935-02-28 Rudolf Haas Dr Ing Vorrichtung zum Antrieb der Schwingplatten bei Membransortierern o. dgl.
DE680051C (de) * 1936-06-15 1939-08-21 Emil Gotthold Oesch Membransichter fuer Zellstoff, Papierstoff u. dgl.
CA1021974A (en) * 1974-08-06 1977-12-06 Jwi Ltd. Paper machine shake
BG22146A1 (fr) * 1975-06-09 1977-05-20
DE2809142C2 (de) * 1978-03-03 1984-01-19 Naamloze Vennootschap Papierfabriek Gennep, Gennep Verfahren und Vorrichtung zum Reinigen einer Faserstoffsuspension
US4539827A (en) * 1983-03-11 1985-09-10 Westvaco Corporation Belt washing improvements

Also Published As

Publication number Publication date
BR8806282A (pt) 1989-08-15
ATE72589T1 (de) 1992-02-15
DE3740480A1 (de) 1989-06-08
DE3868386D1 (de) 1992-03-26
EP0318756A1 (fr) 1989-06-07

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