EP0721526B1 - Method and apparatus for dewatering of a fibre suspension - Google Patents

Method and apparatus for dewatering of a fibre suspension Download PDF

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Publication number
EP0721526B1
EP0721526B1 EP94929079A EP94929079A EP0721526B1 EP 0721526 B1 EP0721526 B1 EP 0721526B1 EP 94929079 A EP94929079 A EP 94929079A EP 94929079 A EP94929079 A EP 94929079A EP 0721526 B1 EP0721526 B1 EP 0721526B1
Authority
EP
European Patent Office
Prior art keywords
dewatering apparatus
fractionator
outlet
fraction
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.)
Expired - Lifetime
Application number
EP94929079A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0721526A1 (en
Inventor
Kent Strid
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.)
Kvaerner Pulping AS
Original Assignee
Kvaerner Pulping AS
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 Kvaerner Pulping AS filed Critical Kvaerner Pulping AS
Publication of EP0721526A1 publication Critical patent/EP0721526A1/en
Application granted granted Critical
Publication of EP0721526B1 publication Critical patent/EP0721526B1/en
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
    • 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
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the present invention concers a method and an apparatus for the conversion of a fibre suspension and particularly for increasing the output of a dewatering apparatus especially for recycled fibre pulp.
  • the present invention concerns a method according to claim 1 and an apparatus according to claim 2.
  • an alternative method is proposed, wherein the filtrate from a dewatering apparatus is treated in a fractionator, where fractioning takes place in liquid, and wherein the fractions from the fractionator are selectively introduced into the dewatered fraction flow from the dewatering apparatus.
  • this can be accomplished in that a fractionator, wherein fractioning takes place in liquid, is connected to a filtrate outlet of a dewatering apparatus, and that fraction outlets of the fractionator lead to a dewatered fraction outlet of the dewatering apparatus.
  • 1 designates any dewatering apparatus, herein shown as a so-called thin film washer of the kind described in Swedish Patent Application No. 9303192-0, filed September 30, 1994 and entitled "Apparatus for washing of fibre suspension”.
  • Diluted recycled fibre pulp (about 1%) is introduced therein through an inlet 2.
  • Water is pressed out of the pulp through a perforated drum 3, and the dewatered pulp (about 8%) is removed from the drum by means of a roller 4 and a scraper 5 and is discharged through an outlet conduit 6.
  • the pressed out water which contains long fibres, fines as well as fillers, is discharged from a container 7 through an outlet 8.
  • a fractionator 10 fractioning in liquid i.e., an apparatus utilizing the fluid flow phenomenon resulting in that larger particles in a flowing liquid are displaced forwardly in the direction of flow, whereas smaller particles are displaced relatively seen backwards in the direction of flow.
  • a flowing plug of, for instance, a suspension there is formed in a flowing plug of, for instance, a suspension, a fractioning in a diminishing particle size from the front and backwards in the plug.
  • the fractionator shown is of the kind described in Swedish Patent Application No. 9303193-8, filed September 30, 1994 and entitled "Fractionator".
  • Such a fractionator is provided with a rotatable cylindrical drum 11, within which are provided a plurality of cylinders 12, 13, 14, 15 and 16 concentric to the drum.
  • Every second such cylinder is tightly connected in its one end to one end wall of the drum, while flow can take place between the other end of the cylinder and the opposite end wall of the drum.
  • the outlets 18, 19 and 20 are connected to outlet conduits 21, 22, 23, respectively, which in turn and in a non-shown manner are connected to the outlet conduit 6 of the dewatering apparatus.
  • the outlet conduits lead to non-shown tanks for the different fractions, wherefrom the fractions may be selectively introduced into the outlet conduit 6 of the dewatering apparatus in order to re-introduce into the concentrated pulp flow present in the outlet conduit 6 selected amounts of selected fractions from the fractionator.
  • the fraction or fractions to be introduced into the outlet conduit 6, as well as the amounts thereof, are determined by sensing the quality of the pulp at the inlet 2 of the dewatering apparatus and/or its outlet 6.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Drying Of Solid Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
EP94929079A 1993-09-30 1994-09-29 Method and apparatus for dewatering of a fibre suspension Expired - Lifetime EP0721526B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9303194A SE501772C2 (sv) 1993-09-30 1993-09-30 Förfarande och anordning för att öka utbytet vid avvattning av en fibersuspension
SE9303194 1993-09-30
PCT/SE1994/000899 WO1995009268A1 (en) 1993-09-30 1994-09-29 Method and apparatus for dewatering of a fibre suspension

Publications (2)

Publication Number Publication Date
EP0721526A1 EP0721526A1 (en) 1996-07-17
EP0721526B1 true EP0721526B1 (en) 1998-12-02

Family

ID=20391269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94929079A Expired - Lifetime EP0721526B1 (en) 1993-09-30 1994-09-29 Method and apparatus for dewatering of a fibre suspension

Country Status (11)

Country Link
EP (1) EP0721526B1 (no)
JP (1) JPH09505641A (no)
AT (1) ATE173952T1 (no)
AU (1) AU7826494A (no)
CA (1) CA2172285A1 (no)
DE (1) DE69415035T2 (no)
ES (1) ES2124430T3 (no)
FI (1) FI111276B (no)
NO (1) NO316278B1 (no)
SE (1) SE501772C2 (no)
WO (1) WO1995009268A1 (no)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0958430A1 (en) * 1996-02-28 1999-11-24 Alfa Laval AB Improved recovery of fine fibers from suspensions containing fibers and contaminants
ATE228183T1 (de) * 1996-08-30 2002-12-15 Voith Paper Fiber Systems Gmbh Vorrichtung zum entwässern einer faserstoffsuspension
FI106386B (fi) 1999-05-03 2001-01-31 Valmet Corp Menetelmä ja laitteisto kuitujen talteenottamiseksi paperitehtaan kiertovedestä

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2666598B1 (fr) * 1990-09-10 1994-05-27 Escher Wyss Gmbh Procede de separation, notamment de tri ou de fractionnement d'une suspension de pate a papier.

Also Published As

Publication number Publication date
FI961452A0 (fi) 1996-03-29
FI111276B (fi) 2003-06-30
SE9303194L (sv) 1995-03-31
DE69415035D1 (de) 1999-01-14
NO316278B1 (no) 2004-01-05
NO961129L (no) 1996-03-20
ES2124430T3 (es) 1999-02-01
NO961129D0 (no) 1996-03-20
WO1995009268A1 (en) 1995-04-06
DE69415035T2 (de) 1999-05-06
FI961452A (fi) 1996-03-29
SE9303194D0 (sv) 1993-09-30
EP0721526A1 (en) 1996-07-17
AU7826494A (en) 1995-04-18
SE501772C2 (sv) 1995-05-15
JPH09505641A (ja) 1997-06-03
ATE173952T1 (de) 1998-12-15
CA2172285A1 (en) 1995-04-06

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