EP1362140A1 - Dispositif permettant l'egouttage et le lavage d'une suspension fibreuse. - Google Patents

Dispositif permettant l'egouttage et le lavage d'une suspension fibreuse.

Info

Publication number
EP1362140A1
EP1362140A1 EP01273495A EP01273495A EP1362140A1 EP 1362140 A1 EP1362140 A1 EP 1362140A1 EP 01273495 A EP01273495 A EP 01273495A EP 01273495 A EP01273495 A EP 01273495A EP 1362140 A1 EP1362140 A1 EP 1362140A1
Authority
EP
European Patent Office
Prior art keywords
washing
rolls
chamber
zone
compartments
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.)
Withdrawn
Application number
EP01273495A
Other languages
German (de)
English (en)
Inventor
Kjell Forslund
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 Technologies Oy
Original Assignee
Metso Paper Oy
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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1362140A1 publication Critical patent/EP1362140A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces

Definitions

  • This invention relates to the dewatering and washing of a fibrous suspension, such as pulp of cellulosic fibrous material.
  • the invention more precisely, relates to a device, which comprises two counter-rotating rolls, which on their shell surface are provided with compartments for the fibrous suspension.
  • the pulp is led as a continuous pulp web between a rotating drum and a surrounding shell.
  • the washing liquid is passed repeatedly through this pulp web.
  • the washing liquid is collected in compartments located beneath the shell surface of the drum, and the bottoms of the compartments are connected to a restricted plane valve, which is located at one end of the drum and co-operates with a stationary contact portion.
  • the present invention offers a solution of the aforesaid problems in that the device is formed with two rolls provided with compartments and counter-rotating, which between themselves form a nip with a symmetric inlet chamber for the fibrous suspension and a washing chamber located above the nip.
  • the characterizing features of the invention are defined in the attached claims.
  • two counter-rotating rolls are used, which can have a substantially smaller diameter with maintained capacity compared with the devices described above and, thus, also can have limited dimensions of the valve system.
  • Another object is to shorten the filtrate lines from the valve sector of the second washing step to the axial connection of the first step, whereby the risk of phase displacement and mixing together is reduced.
  • a further object is to achieve an effective device for dewatering and washing, for better forming of the fibrous suspension, which results in capacity increase alternatively possibilities to construct a smaller device with the same capacity as a greater device according to known state of art.
  • the inlet for the fibrous suspension consists of a head box, which is equipped with seals defining a head chamber to a transfer zone.
  • the device is easily adjustable in vertical direction in order to abut the seals against the rolls.
  • the head box can be dismantled for seal exchange.
  • the head chamber is sealed against the washing zone by an adjustable wedge-shaped seal, which distributes the fibrous suspension and washing liquid into two flows. The seal is placed between the rolls and constitutes a portion of a common washing chamber where washing liquid is supplied axially at the end wall valves of the rolls.
  • the washing flaps in a first washing step terminate with a longitudinal seal, which is enclosed by a contracted washing chamber for a second washing step, the overpressure of which pressurizes the seal.
  • a conveying screw is placed between and below the rolls, the trough sweep of which with end walls is utilized as hold for vertically adjustable arms, and where seals are connected as sealing between a second washing step and the transfer zone.
  • the device shown comprises two opposed rolls 1, the shell surface of which is divided into compartments 3, which are defined by radial wall elements extending in the axial direction of the rolls.
  • the compartments 3 are formed with screen bottoms for draining liquid into each roll.
  • the rolls 1 together form a nip. Beneath the nip a head chamber 2 is symmetrically located.
  • the head chamber is defined by a head box 5 with inlet 4 for the fibrous suspension and compartments 3 on the shell surfaces of the rolls.
  • the head chamber 2 is pressurized and sealed against the rolls in that the head box 5 is vertically movable and has two inclined seals 6 abutting the rolls.
  • the inlets 4 of the head box are placed axially between the opposed rolls.
  • a wedge-shaped seal 8 is located, which is controlled vertically by adjusting means 9.
  • a common washing chamber 10 is located with axial connection 11 for the supply of washing liquid.
  • the common washing chamber 10 communicates with a first washing zone 25 on each roll 1.
  • the washing zones 25 are defined by the two rolls 1 and washing flaps 12, which extend along the shell surface of each roll so that the height of the washing zones successively decreases.
  • the washing flaps 12 terminate with seals 13 against a second washing chamber 14 on each roll.
  • These second washing chambers 14 are connected to second inlets 15 and communicate with a second washing zone 26 on each roll 1.
  • These second washing zones 26 are defined by each roll 1 and second washing flaps 16, which extend along the shell surfaces of the rolls so that the height of the washing zones successively decreases.
  • the second washing zones 26 terminate with seals 19.
  • a transfer zone 28 is located where the dewatered and washed fibrous suspension is removed from the compartments 3 of the rolls to a trough 17 located below, in which a conveying screw 21 is provided.
  • the seals 19 preferably are placed on arms 18, which are vertically adjustable in guides 20 on the trough for setting and adjusting the seals.
  • the washing flaps 12, 16 can be provided with perforated cover plates 27, which abut the compartments of the rolls to distribute the washing liquid into the compartments for constricting the liquid in the fibrous suspension through the screen bottoms of the compartments into the rolls.
  • the rolls should have a diameter of 1-3 metre, preferably 1,5 - 2,5 metre.
  • the head chamber 2 is a thickening and forming zone for the ingoing fibrous suspension, which at the inlet normally has a concentration of 3-8%.
  • the head chamber is sealed against the common washing chamber 10 by the wedge-shaped seal 8, which distributes the fibrous suspension into two equally great portions in the compartments 3 on the roll in question.
  • the pulp concentration in the compartments 3 is there suitably 12-16% ⁇ .
  • the seal 8 constitutes also a portion of the common washing chamber 10, from which the washing liquid is distributed into two equally great flows in the first washing zones 25.
  • the washing liquid is supplied axially to the washing chamber 10, the connection 11 of which is placed at the end wall valves of the rolls 1.
  • the washing flaps 12 in the first washing zones 25 should extend along about a third or more of the circumference of the rolls.
  • the washing flaps 16 in the second washing zones 26 should also extend along a third or more of the circumference of the rolls.
  • the washing flaps 12 and 16 together can enclose 250 - 300° of the roll in question.
  • the second washing chambers 14 are arranged both to distribute the washing liquid and to pressurize the longitudinal seals 13, which are located at the end of the washing flaps 12.
  • the treated fibrous suspension is removed from the compartments 3 and moved away by the conveying screw 21 to a subsequent treatment step.
  • the compartments 3 are thereafter rinsed by means of the spray pipes 7.
  • the device can be formed with a single washing zone on each roll. This washing zone extends from the common washing chamber 10 to the transfer zone 28.
  • the washing principle at the device according to the invention is to lead washing liquid to the washing zones 25, 26 where the washing liquid is distributed over the fibrous suspension in the compartments 3 of the rolls.
  • the filtrate constricted through the screen bottoms of the compartments is advanced axially in the rolls to valves mounted on the end walls of the rolls.
  • the filtrate is pumped by a pump 30 from the second washing zone 26 directly to the axial connection 11 to the common washing chamber 10 and to the first washing zone 25.
  • the filtrate from the first washing zone is taken out through the end wall valves of the rolls and is moved to some other place in the process.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Abstract

L'invention concerne un dispositif permettant l'égouttage et le lavage d'une suspension fibreuse. Ce dispositif comprend deux rouleaux (1) qui forment ensemble une ligne de pincement dans laquelle est disposé un joint (8) d'étanchéité. Une chambre (2) de tête destinée à recevoir la suspension est disposée de manière symétrique, directement sous la ligne de pincement des rouleaux, et une chambre (10) de lavage commune permettant d'alimenter au moins une zone (25) lavage en liquide de lavage, est placée de manière symétrique directement au dessus de la ligne de pincement des rouleaux. La surface de l'enveloppe externe des rouleaux (1) est divisée en compartiments (3) dont le fond est formé de tamis, et qui sont conçus pour recevoir la suspension provenant de la chambre (2) de tête, et évacuer le filtrat dans chaque rouleau de manière à le conduire dans la zone (25) de lavage. La zone (25) de lavage est définie par chaque rouleau (1) et par un volet (12) de lavage qui s'étend le long de la surface de l'enveloppe de chaque rouleau (1).
EP01273495A 2001-01-24 2001-12-21 Dispositif permettant l'egouttage et le lavage d'une suspension fibreuse. Withdrawn EP1362140A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0100214 2001-01-24
SE0100214A SE518251C2 (sv) 2001-01-24 2001-01-24 Anordning för tvättning och avvattning av en fibersuspension
PCT/SE2001/002868 WO2002059418A1 (fr) 2001-01-24 2001-12-21 Dispositif permettant l'egouttage et le lavage d'une suspension fibreuse.

Publications (1)

Publication Number Publication Date
EP1362140A1 true EP1362140A1 (fr) 2003-11-19

Family

ID=20282725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01273495A Withdrawn EP1362140A1 (fr) 2001-01-24 2001-12-21 Dispositif permettant l'egouttage et le lavage d'une suspension fibreuse.

Country Status (3)

Country Link
EP (1) EP1362140A1 (fr)
SE (1) SE518251C2 (fr)
WO (1) WO2002059418A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE528721C2 (sv) * 2005-06-03 2007-01-30 Metso Paper Inc Anordning och metod för tätningsjustering i en tvättanordning för behandling av cellulosamassa

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE380300C (sv) * 1974-03-04 1984-10-29 Sunds Ab Anordning for vetskebehandling av en fibersuspension
FI71961C (fi) * 1985-10-31 1987-03-09 Enso Gutzeit Oy Anordning foer tvaettning av cellulosa.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02059418A1 *

Also Published As

Publication number Publication date
SE0100214D0 (sv) 2001-01-24
SE0100214L (sv) 2002-07-25
SE518251C2 (sv) 2002-09-17
WO2002059418A1 (fr) 2002-08-01

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