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WO1990012919A1 - Dispositif d'egouttage - Google Patents

Dispositif d'egouttage Download PDF

Info

Publication number
WO1990012919A1
WO1990012919A1 PCT/SE1990/000168 SE9000168W WO9012919A1 WO 1990012919 A1 WO1990012919 A1 WO 1990012919A1 SE 9000168 W SE9000168 W SE 9000168W WO 9012919 A1 WO9012919 A1 WO 9012919A1
Authority
WO
WIPO (PCT)
Prior art keywords
screening cylinder
pulp
screw thread
dewatering
cylinder
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/SE1990/000168
Other languages
English (en)
Inventor
Ebbe HODÉN
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.)
Valmet AB
Original Assignee
Sunds Defibrator Industries AB
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 Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of WO1990012919A1 publication Critical patent/WO1990012919A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/11—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis

Definitions

  • This invention relates to a device for dewatering pulp suspensions of various types, preferably cellulose pulp.
  • the fibre material is repeatedly diluted and dewatered, depending on its processing in different steps.
  • the dewatering can be carried out in different ways by using different types of equipment, for example suction filter, screw type presses, roll presses, disc presses and centrifuges.
  • suction filter for example suction filter, screw type presses, roll presses, disc presses and centrifuges.
  • the dewatering is desired to be carried out so that the liquid content in the pulp suspension is removed without the fibre material following along therewith.
  • the apertures in the screen surface, through which the dewatering takes place must not be made too small, in order to prevent the risk of clogging and as a result thereof the capacity of becoming too low.
  • the present invention which consists of a dewatering device of eentrifuge type, implies, that the aforesaid problems can be reduced.
  • the characterizing features of the invention become apparent from the attached claims.
  • the device shown comprises a screening cylinder 1, which is rotatable about a vertical rotation axis.
  • the screening cylinder is driven by a first motor 2 with variable speed.
  • a rotatable shaft 3 is located, whibh is driven separately by a second motor 4 with variable speed.
  • the shaft 3 is hollow and provided with an inlet 5 for the pulp suspension at its upper end and with supply openings 6 at the lower end of the screening cylinder 1.
  • the shaft 3 further is provided with a screw thread 7 for conveying the pulp upward through the screening cylinder 1 and simultaneously dewatering the pulp. The dewatering is obtained as a result of the effect of the centrifugal force. Due to the fact that the screening cylinder 1 and the shaft 3 are rotated in the same direction, but at a slightly different speed, the desired upward conveyance can be obtained. By adjusting this difference in speed, the pulp conveyance can be controlled.
  • the inlet 5 for the pulp suspension also can be located at the other end of the shaft 3. Alternatively, the inlet can be located directly in the bottom of the space inside of the screening cylinder 1. The essential feature is that the pulp suspension is supplied at the lower part of the screening cylinder 1.
  • the screw thread 7 does not extend all the way to the screening cylinder 1, thereby leaving a gap 8 between the saire.
  • the size of the gap should be 1-20 mm, preferably 3-10 mm.
  • outlets 9 for the dewatered pulp are located in the upper part of the screening cylinder 1. Outside of these outlet openings 9 a collecting device 10 is located to receive the dewatered pulp fed out through said openings 9.
  • the liquid separated by the screening cylinder 1 is collected in an outer chamber 11 enclosing the screening cylinder 1.
  • the liquid is discharged therefrom through an outlet 12.
  • a cleaning device 13 is located, which is axially movable along the screening cylinder 1 and formed with nozzles for spraying liquid or air inward to the screening dylinder 1.
  • the pulp suspension supplied through the shaft 3 preferably has a concentration of 1-4 %.
  • the pulp is rotated by the screw thread 7 and screening cylinder 1, so that the dewatering is brought about by the effect of the centrifugal force, In the gap 8 between the screw thread and screening cylinder a pulp layer is deposited.
  • This layer will serve as a filter medium, through which the dewatering takes place. Due to the pulp layer, the separation of the fibre material is very effective.
  • the thickness of the layer is determined by the screw thread.
  • the layer deposited possibly can be removed temporarily in a suitable manner, for example by an arrangement for rinsing as shown in the Figure.
  • the concentration of the pulp after the dewatering can amount to 30% or higher at the same time as the fibre content in the liquid is negligible.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Centrifugal Separators (AREA)

Abstract

Dispositif d'égouttage pour suspension de pâtes, comprenant un cylindre de tamisage rotatif (1) dans lequel est placé une tige rotative (3) pourvue d'un filetage (7) pour amener la pâte à travers le cylindre de tamisage (1) tout en égouttant ladite pâte par l'effet de la force centrifuge. Entre le filetage (7) et le cylindre de tamisage (1) on crée un écartement (8) dans lequel on peut déposer une couche de pâte à l'intérieur du cylindre de tamisage (1) de sorte que ladite couche agisse sous forme de milieu de filtrage, à travers lequel s'effectue l'égouttage.
PCT/SE1990/000168 1989-04-17 1990-03-15 Dispositif d'egouttage Ceased WO1990012919A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901373-4 1989-04-17
SE8901373A SE463425B (sv) 1989-04-17 1989-04-17 Avvattningsanordning

Publications (1)

Publication Number Publication Date
WO1990012919A1 true WO1990012919A1 (fr) 1990-11-01

Family

ID=20375690

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000168 Ceased WO1990012919A1 (fr) 1989-04-17 1990-03-15 Dispositif d'egouttage

Country Status (3)

Country Link
AU (1) AU5541790A (fr)
SE (1) SE463425B (fr)
WO (1) WO1990012919A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0549092A1 (fr) * 1991-12-20 1993-06-30 Fukoku Kogyo Co. Ltd. Tambour filtrant rotatif
WO1993011851A3 (fr) * 1991-12-05 1993-07-22 Maximilian Kriegl Separateur de materiau particulaire
WO1995011076A1 (fr) * 1993-10-21 1995-04-27 Joseph Gardner Separateur de boues
GB2297281A (en) * 1993-10-21 1996-07-31 Joseph Gardner Slurry separator
EP0933470A3 (fr) * 1998-02-03 2000-05-17 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Concentrateur par essorage
US6071378A (en) * 1995-07-17 2000-06-06 Kvaerner Pulping Ab Method and device for treating a pulp suspension
US6139685A (en) * 1998-01-16 2000-10-31 Kvaerner Pulping Ab Method and device for treating a pulp suspension
EP2202052A1 (fr) * 2008-12-29 2010-06-30 Andritz AG Procédé et dispositif destinés à drainer et disperser une matière fibreuse
WO2014037187A1 (fr) * 2012-09-06 2014-03-13 Siemens Vai Metals Technologies Gmbh Dispositif d'essorage de boue
EP2764156A4 (fr) * 2011-10-03 2015-05-27 Valmet Aktiebolag Dispositif de distribution de pâte
US12257588B2 (en) 2019-01-09 2025-03-25 Jeremy Leonard Centrifugal separator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107640881A (zh) * 2017-11-03 2018-01-30 张佩春 一种带反冲清洗的污水预脱水装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2019237A (en) * 1978-03-29 1979-10-31 Uop Inc Process for dewatering fibrous waste
SE421434B (sv) * 1978-06-14 1981-12-21 Berggren Torsten L Skruvpress

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2019237A (en) * 1978-03-29 1979-10-31 Uop Inc Process for dewatering fibrous waste
SE421434B (sv) * 1978-06-14 1981-12-21 Berggren Torsten L Skruvpress

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5507947A (en) * 1991-12-05 1996-04-16 Kriegl; Maximilian Centrifugal apparatus for separating particulate material
WO1993011851A3 (fr) * 1991-12-05 1993-07-22 Maximilian Kriegl Separateur de materiau particulaire
AU654863B2 (en) * 1991-12-20 1994-11-24 Fukoku Kogyo Co., Ltd. Rotary filter
EP0549092A1 (fr) * 1991-12-20 1993-06-30 Fukoku Kogyo Co. Ltd. Tambour filtrant rotatif
GB2297281B (en) * 1993-10-21 1998-04-01 Joseph Gardner Slurry separator
GB2297281A (en) * 1993-10-21 1996-07-31 Joseph Gardner Slurry separator
WO1995011076A1 (fr) * 1993-10-21 1995-04-27 Joseph Gardner Separateur de boues
US6071378A (en) * 1995-07-17 2000-06-06 Kvaerner Pulping Ab Method and device for treating a pulp suspension
US6139685A (en) * 1998-01-16 2000-10-31 Kvaerner Pulping Ab Method and device for treating a pulp suspension
EP0933470A3 (fr) * 1998-02-03 2000-05-17 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Concentrateur par essorage
US6261417B1 (en) 1998-02-03 2001-07-17 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Dehydrating concentrator
EP2202052A1 (fr) * 2008-12-29 2010-06-30 Andritz AG Procédé et dispositif destinés à drainer et disperser une matière fibreuse
EP2764156A4 (fr) * 2011-10-03 2015-05-27 Valmet Aktiebolag Dispositif de distribution de pâte
WO2014037187A1 (fr) * 2012-09-06 2014-03-13 Siemens Vai Metals Technologies Gmbh Dispositif d'essorage de boue
US12257588B2 (en) 2019-01-09 2025-03-25 Jeremy Leonard Centrifugal separator

Also Published As

Publication number Publication date
SE8901373L (sv) 1990-10-18
SE463425B (sv) 1990-11-19
SE8901373D0 (sv) 1989-04-17
AU5541790A (en) 1990-11-16

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