EP1876289B1 - Procédé destiné à la séparation d'impuretés d'une suspension fibreuse - Google Patents

Procédé destiné à la séparation d'impuretés d'une suspension fibreuse Download PDF

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Publication number
EP1876289B1
EP1876289B1 EP07008488A EP07008488A EP1876289B1 EP 1876289 B1 EP1876289 B1 EP 1876289B1 EP 07008488 A EP07008488 A EP 07008488A EP 07008488 A EP07008488 A EP 07008488A EP 1876289 B1 EP1876289 B1 EP 1876289B1
Authority
EP
European Patent Office
Prior art keywords
stream
return flow
piece
pipe
pressure screen
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.)
Not-in-force
Application number
EP07008488A
Other languages
German (de)
English (en)
Other versions
EP1876289A1 (fr
Inventor
Georg Jäger
Reimund Rienecker
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
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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
Publication of EP1876289A1 publication Critical patent/EP1876289A1/fr
Application granted granted Critical
Publication of EP1876289B1 publication Critical patent/EP1876289B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21D5/26—De-aeration of paper stock
    • 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 method according to the preamble of claim 1.
  • Such a method is for example off EP-A-1 184 509 known.
  • Such a separation process serves to remove undesired accompanying substances, so-called impurities, in particular from a fiber suspension suitable for paper production.
  • pulp suspensions to be used for papermaking especially those recovered from waste paper, often contain a greater or lesser amount of impurities which must be removed in the processing plant.
  • Screening apparatuses which are called sorters or pressure sorters have proved particularly suitable for this purpose.
  • the suspension on a sieve is divided into at least two fractions, one that contains the substances that have passed through the sieve and one that overflows with the substances that have been rejected because of their size.
  • the fibers get into the pass as purified accepts suspension. It is also the abundant water is preferably in the flow, so that the overflow is thickened.
  • the invention is based on the object to provide a reliable method, can be returned to the return streams easily and easily in the pressure sorter.
  • the return flow is diverted as recirculation from the overflow stream.
  • Such return flow improves the safe operation of the pressure sorter. It is favorable that the overflow can be set to such amounts, in which a sufficient discharge speed of the overflow is ensured without undue impact losses or material losses occur: The excess of overflow is returned to the separation process. Also, a safety margin for the overflow amount to compensate for throughput volume fluctuations is easy to implement. However, it is also easily possible to control the amount of the recirculation component in such a way that the overflow quantity remains constant even with changed throughput ratios or is kept above a set minimum value.
  • the return flow from the flow stream can be divided.
  • Fig. 1 shows schematically a pressure sorter 1.
  • the incoming pulp suspension stream 2 is guided into the interior of the housing 11 and then passes radially from inside to outside partly the cylindrical screen basket 7.
  • This can be provided with slot-shaped screen openings whose width, for example between 0 , 08 and 0.5 mm.
  • a flow stream 3 is formed and an overflow stream 4. Both streams can then leave the housing 11 through the connection piece.
  • a rotating scraper 13 located radially inside the screen basket 7, a rotating scraper 13.
  • Such pressure graders are known in many variations and need not be described in detail machine technology.
  • the overflow stream 4 is divided in a distribution device 8.
  • the overflow stream 4 exits the housing with an overpressure, which makes it possible to return the diverted from the overflow stream 4 return flow 5 without further pump in the housing again.
  • This is in the center of the lid, so where a relatively low pressure prevails, a Rezirkulationsaufsatzteil 14, whose function on hand Fig. 2 is explained.
  • the recirculation attachment part 14 is placed concentrically with the housing 11 on the lid 10 arranged above, preferably screwed to it via flanges.
  • the pipe section 16 is open to the inlet space 17 of the pressure sorter 1.
  • the pipe section 16 terminate internally with the cover 10, while the return line 18 opens at a distance A from the lid 10, which corresponds for example to 1 to 5 times the inner diameter of the return line 18.
  • the vent line 15 'can have a connection angle ⁇ to the horizontal, which is greater than 0, for example between 5 and 30 °, which can be easily deduct the gases accumulating above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Claims (15)

  1. Procédé pour la séparation d'impuretés d'une suspension de matières fibreuses, dans lequel on introduit un courant de suspension de matières fibreuses (2) dans une chambre d'admission (17) d'un classeur sous pression (1), dans lequel on enrichit une partie de la suspension de matières fibreuses à séparer avant un panier de triage (7) dans le classeur sous pression (1) et on l'évacue dans un courant de débordement (4), tandis que l'autre partie de la suspension de matières fibreuses quitte le classeur sous pression (1) sous la forme d'un courant de transit (3) et dans lequel on forme un courant de retour (5), qui est renvoyé au centre de la chambre d'admission (17) du classeur sous pression (1) via une conduite de retour centrale (18) installée au milieu du couvercle (10) du classeur sous pression (1), caractérisé en ce que l'on évacue des gaz (12) hors d'une région centrale de l'enceinte (11) du classeur sous pression (1) via une pièce tubulaire concentrique (16) entourant la conduite de retour (18).
  2. Procédé selon la revendication 1, caractérisé en ce que l'on prend comme courant de retour (5) une partie du courant de débordement (4).
  3. Procédé selon la revendication 2, caractérisé en ce que l'on forme, avec l'autre partie du courant de débordement (4), un courant de déchets (6) avec lequel on évacue des matières parasites indésirables.
  4. Procédé selon la revendication 2 ou 3, dans lequel on utilise le classeur sous pression (1) de telle manière que le courant de débordement (4) s'épaississe et que le courant de transit (3) se dilue, caractérisé en ce que l'on règle le courant de retour (5) au moins à un niveau élevé tel que l'épaississement du courant de débordement (4) reste tellement faible, dans toutes les situations de fonctionnement, que son écoulement hors du classeur sous pression (1) ne soit pas gêné.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on évacue un courant de gaz (12), en particulier d'air, hors de la région centrale de la chambre d'admission (17).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise un panier de triage cylindrique (7) avec des ouvertures de triage en forme de fentes.
  7. Procédé selon l'une quelconque des revendications 2, 3, 4, 5 ou 6, caractérisé en ce que l'on règle la répartition du courant de débordement (4) au moyen d'un régulateur, qui commande un dispositif de répartition correspondant (8).
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on conduit le courant de retour (5) dans une conduite tubulaire disposée à l'extérieur de l'enceinte (11) du classeur sous pression (1).
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on utilise une pièce rapportée de recirculation (14), qui est posée au milieu du couvercle (10) du classeur sous pression (1), qui comprend la conduite de retour centrale (18) ainsi que la pièce tubulaire concentrique (16) entourant celle-ci, à laquelle une conduite d'échappement d'air (15, 15') est raccordée, et en ce qu'aussi bien la conduite de retour (18) que la pièce tubulaire (16) débouchent dans la chambre d'admission (17) du classeur sous pression (1).
  10. Procédé selon la revendication 9, caractérisé en ce que l'on évacue les gaz (12) tangentiellement hors de la pièce tubulaire (16).
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce que la conduite d'échappement d'air (15') est orientée, par rapport à l'horizontale, avec un angle d'inclinaison (α), qui est compris entre 5° et 30°.
  12. Procédé selon l'une quelconque des revendications 9, 10 ou 11, caractérisé en ce que la conduite de retour (18) débouche dans la chambre d'admission (17) à une distance axiale (A) par rapport à la pièce tubulaire (16), qui vaut de 1 à 10 fois, de préférence de 2 à 5 fois, le diamètre intérieur de la conduite de retour (18).
  13. Procédé selon l'une quelconque des revendications 9 à 12, caractérisé en ce que le diamètre intérieur de la pièce tubulaire (16) présente une dimension comprise entre 5 % et 40 %, de préférence entre 10 % et 20 %, du diamètre intérieur de l'enceinte (11) dans la région de la chambre d'admission (17).
  14. Procédé selon l'une quelconque des revendications 9 à 13, caractérisé en ce que le diamètre intérieur de la pièce tubulaire (16) présente une dimension de 150 % à 400 % du diamètre intérieur de la conduite de retour (18).
  15. Procédé selon l'une quelconque des revendications 9 à 14, caractérisé en ce qu'une longueur axiale de la pièce tubulaire (16) est comprise entre 100 et 1000 mm.
EP07008488A 2006-07-04 2007-04-26 Procédé destiné à la séparation d'impuretés d'une suspension fibreuse Not-in-force EP1876289B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006030905A DE102006030905B3 (de) 2006-07-04 2006-07-04 Verfahren zur Abscheidung von Verunreinigungen aus einer Faserstoffsuspension

Publications (2)

Publication Number Publication Date
EP1876289A1 EP1876289A1 (fr) 2008-01-09
EP1876289B1 true EP1876289B1 (fr) 2011-08-10

Family

ID=38190277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07008488A Not-in-force EP1876289B1 (fr) 2006-07-04 2007-04-26 Procédé destiné à la séparation d'impuretés d'une suspension fibreuse

Country Status (4)

Country Link
US (1) US20080006580A1 (fr)
EP (1) EP1876289B1 (fr)
AT (1) ATE519889T1 (fr)
DE (1) DE102006030905B3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008061970A1 (de) * 2008-12-12 2010-06-17 Voith Patent Gmbh Konstantteil-Sortierung
DE102012215577A1 (de) 2012-09-03 2014-03-06 Voith Patent Gmbh Drucksortierer
CN112892219B (zh) * 2021-01-22 2022-11-29 宜昌天仁药业有限责任公司 一种用于膜分离的微滤膜实验设备

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2249013A (en) * 1939-09-01 1941-07-15 Paul B Levengood Cleaning apparatus
US3209914A (en) * 1961-08-15 1965-10-05 Carl H Nordell Screen and rake combination for removing solids from liquids
US3255884A (en) * 1962-10-09 1966-06-14 Jr George W Sargent Paper stock screen
US3363771A (en) * 1966-08-03 1968-01-16 Brown Charles H Liquid filter
US4027691A (en) * 1972-01-08 1977-06-07 N.V. Spiro Research Device for venting and aerating closed circulatory water flow systems
DE3519373A1 (de) * 1985-05-30 1986-12-04 J.M. Voith Gmbh, 7920 Heidenheim Sortiergeraet
FI87999C (fi) * 1990-08-14 1993-03-25 Ahlstroem Oy Separationsfoerfarande och -anordning foer separering av vaerdefull eller vaerdeloes fraktion fraon massa-, loesstoff- eller motsvarande materialsuspension genom att utnyttja flotationsprocessen
FI94440C (fi) * 1990-08-14 1995-09-11 Ahlstroem Oy Menetelmä ja -laitteisto ilmaa ja/tai kaasua sisältävä nesteen tai kuitususpension käsittelemiseksi sekä kaasua erottavan massapumpun käytöt
FI93979C (fi) * 1993-08-20 1995-06-26 Tampella Oy Valmet Menetelmä ja painelajitin kuitumassan lajittelemiseksi
DE19702044C1 (de) * 1997-01-22 1998-04-16 Voith Sulzer Stoffaufbereitung Sichter für eine Faserstoffsuspension
FI103290B (fi) * 1997-11-13 1999-05-31 Valmet Raisio Oy Menetelmä ja sovitelma epäpuhtauksien erottelemiseksi päällystysaseman konekierrosta
US6571957B1 (en) * 2000-08-07 2003-06-03 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension
DE10060822B4 (de) * 2000-12-07 2006-04-27 Voith Paper Patent Gmbh Drucksortierer zum Entfernen von Störstoffen aus einer störstoffhaltigen Papierfasersuspension
DE10125975A1 (de) * 2001-05-29 2002-12-05 Voith Paper Patent Gmbh Verfahren zur Abscheidung von Anteilen aus einer Faserstoffsuspension
DE10233364C1 (de) * 2002-07-23 2003-12-24 Voith Paper Patent Gmbh Drucksortierer zum Sieben einer Faserstoffsuspension

Also Published As

Publication number Publication date
US20080006580A1 (en) 2008-01-10
EP1876289A1 (fr) 2008-01-09
ATE519889T1 (de) 2011-08-15
DE102006030905B3 (de) 2007-07-19

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