EP0198825B1 - Waschanlage für pulpe - Google Patents

Waschanlage für pulpe Download PDF

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Publication number
EP0198825B1
EP0198825B1 EP19840904213 EP84904213A EP0198825B1 EP 0198825 B1 EP0198825 B1 EP 0198825B1 EP 19840904213 EP19840904213 EP 19840904213 EP 84904213 A EP84904213 A EP 84904213A EP 0198825 B1 EP0198825 B1 EP 0198825B1
Authority
EP
European Patent Office
Prior art keywords
web
liquid
end rolls
upper portion
cellulose pulp
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
Application number
EP19840904213
Other languages
English (en)
French (fr)
Other versions
EP0198825A1 (de
Inventor
Lars Eyolf NÄSMAN
Alf Inge LINDSTRÖM
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
Priority to AT84904213T priority Critical patent/ATE56230T1/de
Publication of EP0198825A1 publication Critical patent/EP0198825A1/de
Application granted granted Critical
Publication of EP0198825B1 publication Critical patent/EP0198825B1/de
Expired legal-status Critical Current

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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 an apparatus for the liquid treatment of cellulose pulp, for example washing and dewatering
  • the invention more precisely, refers to an apparatus where the pulp from a head box is allowed to flow out and form a layer on a plane, endless liquid permeable web.
  • the web runs over two end rolls, and treatment liquid is supplied on the upper surface of the pulp layer at the same time as liquid is sucked away from the lower surface of the pulp layer to vacuum vessels beneath the web.
  • the web usually is a wire manufactured of plastic wires.
  • the wire is driven by one end roll and slides over the perforated covers on the underlying vacuum vessels. Owing to the friction between the wire and vessel covers, great forces are required for driving the wire, This gives rise, at the same time, to high tensile stresses in the wire, which thereby is restricted as to its possible length, because the tensile stress increases with the length of the contact surface between wire and vessel covers.
  • a pulp washer in which washing of the pulp is accomplished with the use of a pair of wire belts between which the pulp layer is provided.
  • a number of tensioning rolls and guide rolls are provided for the wire belts in order to provide the necessary flexibility for the belt to pass about the various rolls.
  • the present invention has the object to eliminate the aforesaid problems and at the same time to render further advantages possible.
  • the plastic wire referred to above is replaced by a perforated steel web.
  • a steel web having a thickness of between 0.5 and 1.5mm and an open area of between 8 and 25% has a substantially higher tensile strength than a wire. It is, further, relatively simple and inexpensive to repair damages in the web. Since a steel web also has a higher resistance to pressure, the dewatering of the pulp layer according to the invention can be carried out much more effectively.
  • a further advantage is that the open area in the covers of the vacuum vessels can be increased due to the inherent carrying capacity of the steel web.
  • Fig. 1 shows a liquid treatment apparatus according to the invention
  • Fig, 2 is a cross-section along II-II in Fig, 1.
  • the embodiment shown of the apparatus comprises an endless perforated steel web 1, which runs about a first and a second end roll 2 and, respectively, 3.
  • the rolls are mounted in a stand 4 so that the first roll 2 is movable by means of a stretching device 5, preferably a hydraulic one, for adjusting the web tension.
  • the driving is effected via the second roll 3, and both rolls preferably are coated with a friction-increasing surface layer.
  • a head box 6 is located for distributing the cellulose pulp in the form of a uniform layer on the web 1
  • a rotor 7 is located for deflocculating the pulp.
  • Beneath the web a plurality of vacuum vessels 8 are arranged one after the other in the longitudinal direction of the web. The vessels are provided with perforated covers acting as a support for the web 1.
  • Outlets 9 and, respectively, 10 are connected to the vessels 8 for the discharge of liquid and, respectively, gas.
  • Above the web means 11 for the supply of treatment liquid are located. Over the pulp layer a pressure difference is maintained for effecting liquid transport crosswise through the pulp layer.
  • the width of the pulp layer on the web is limited by two endless deckle straps 12, which follow along with the web 1. Also other means for limiting the width, of course, can be imagined.
  • a hood 13 is placed over the web 1.
  • a transfer device 14 for the pulp layer after its completed treatment is located, which for example has the form of a doctor blade. Beneath the same a conveying screw 15 is provided for conveying the pulp to subsequent processing steps.
  • Said second roll 3, also co-operates with means for pressing liquid from the pulp layer. According to the embodiment shown, these means are a liquid-permeable web 16, which is held pressed against the steel web 1. The web 16 runs over two small rolls 17,18 and a stretch roll 19.
  • the second end roll 3 is provided with grooves extending all about the roll to permit liquid to be pressed through the steel web 1. The liquid pressed off is collected in a trough 20 beneath the end roll 3. It is, of course, also possible to use other types of pressing means.
  • the pressing-off implies that a high dry content of the pulp can be obtained.
  • the pulp concentration for example, can be increased from about 8% to about 30% by this pressing-off. This implies that a greater part than normal of the chemical content of the pulp can be removed already in connection with the liquid treatment. It is possible from a chemical content of 6 - 10% at a conventional fourdrinier wire washing to come down to 1 - 3%. It is thereby possible, for example, to pass the pulp from the treatment plant directly to the bleach plant without further dewatering in special thickeners.
  • the steel web used preferably shall have a thickness of 0,5 - 1,5 mm.
  • the diameter of the end rolls must be adapted to the thickness of the web, because the bending stress in the web is directly proportional to the web thickness and reciprocally proportional to the roll diameter.
  • a suitable dimension of the rolls can be about 2 m diameter.
  • the hole size must be adapted to the pulp to be treated, but should be in the interval 0,5 - 1,5 mm diameter. It is also imaginable, of course, to form the holes as slits.
  • the open area must under all conditions be between 8 and 25%.
  • the length and width of the web are not critical, but can be adapted at option.
  • the desired width can be brought about by welding a number of narrow webs longitudinally to a wider web, because it is not possible to directly manufacture steel webs having widths here in question, for example about 6 m.
  • Steel webs normally are not manufactured in widths exceeding much more than one meter.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Claims (4)

1. Vorrichtung zur flüssigen Behandlung celluloser Pülpe, bestehend aus einem endlosen perforierten Band (1), das um ein Paar Abstand voneinander aufweisende Rollen (2, 3), von denen eine eine angetriebene Rolle (3) ist, läuft, wodurch es einen im wesentlichen horizontal verlaufenden Oberteil aufweist, wobei das Band (1) dazu vorgesehen ist, von den Endrollen bewegt zu werden, mit einer Kopfaufgabevorrichtung (6) um Cellulosepülpe bei der ersten Rolle (2) zur direkten Behandlung auf dem oberen Teil des Bandes (1) aufzubringen, mit Flüssigkeitssammeleinrichtungen (8), die zwischen dem Paar Endrollen (2, 3) vorgesehen sind, um die Flüssigkeit zu sammeln, die aus der Cellulosepülpe durch das Band (1) durchtritt, wenn das Band durch die Antriebsrolle (3) relativ zu den Flüssigkeitssammeleinrichtungen bewegt wird, diese Flüssigkeitssammeleinrichtungen (8) haben eine im wesentlichen horizontal verlaufende Oberfläche, die unterhalb und im direkten Kontakt mit dem Oberteil des Bandes (1) angeordnet sind, mit Flüssigkeitsaufbringvorrichtungen (11), die oberhalb des Oberteils des Bandes angeordnet sind, um der dem Oberteil des Bandes zugeführten Cellulosepülpe Behandlungsflüssigkeit zuzuführen, mit Mitteln, um einen über den Oberteil des Bandes unterschiedlichen Druck aufbringen zu können, um Flüssigkeit aus der Cellulosepülpe durch das Band in die Flüssigkeitssammelvorrichtungen (8) zu pressen, wenn das Band relativ zu den Flüssigkeitssammelvorrichtungen bewegt wird und mit Abnahmemitteln (14), um die behandelte Cellulosepülpe vom Band (1) abzunehmen, nachdem die Cellulosepülpe der Flüssigbehandlung unterworfen worden ist,
dadurch gekennzeichnet, daß das Band (1) aus Stahl besteht und eine Dicke zwischen 0,5 und 1,5 mm aufweist und so perforiert ist, daß seine - offene Fläche zwischen 8% und 25% liegt, und daß die Mittel (16) zum Auspressen der Flüssigkeit so angeordnet sind, daß sie mit dem Stahlband (1) während seines Umlaufes um die zweite Rolle (3) zusammenwirken.
2. Vorrichtung nach Anspruch 1, wobei das endlose Stahlband (1) von dem Paar Abstand voneinander aufweisender Endrollen (2, 3) gestützt wird und die Flüssigkeitssammelvorrichtungen (8) dazwischen angeordnet sind; wobei das endlose Stahlband (1) einen unteren Teil aufweist, der sich zwischen den Endrollen erstreckt; und wobei die Vorrichtung zur flüssigen Behandlung weiters Mittel (5) aufweist, um den Abstand zwischen den Endrollen verändern zu können, um die Spannung des endlosen Stahlbandes (1) regeln zu können und den unteren Teil des endlosen Stahlbandes im wesentlichen horizontal zu halten.
3. Vorrichtung nach Anspruch 2, wobei die Länge der horizontal angeordneten Oberfläche der Flüssigkeitssammeleinrichtungen (8) im wesentlichen dem Abstand zwischen den Endrollen (2, 3) entspricht.
4. Vorrichtung nach Anspruch 2, wobei die Flüssigkeitssammeleinrichtungen (8) eine Mehrzahl von Behältern (8) umfassen, die zwischen dem Paar von Endrollen (2, 3) angeordnet sind, wobei die Behälter (8) einzeln quer zur Längsrichtung der Bewegung des endlosen Gewebes (1) angeordnet sind und die Behälter (8) hintereinander in der Längsrichtung der Bewegung des Bandes sich erstrecken, wobei jeder der Behälter mit perforierten Abdeckungen versehen ist, die im Kontakt mit dem Oberteil des Bandes (1) stehen.
EP19840904213 1983-12-02 1984-11-12 Waschanlage für pulpe Expired EP0198825B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84904213T ATE56230T1 (de) 1983-12-02 1984-11-12 Waschanlage fuer pulpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8306658A SE452344B (sv) 1983-12-02 1983-12-02 Anordning for tvettning av cellulosamassa
SE8306658 1983-12-02

Publications (2)

Publication Number Publication Date
EP0198825A1 EP0198825A1 (de) 1986-10-29
EP0198825B1 true EP0198825B1 (de) 1990-09-05

Family

ID=20353557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840904213 Expired EP0198825B1 (de) 1983-12-02 1984-11-12 Waschanlage für pulpe

Country Status (9)

Country Link
EP (1) EP0198825B1 (de)
JP (1) JPS61500558A (de)
AU (1) AU575883B2 (de)
CA (1) CA1265691A (de)
DE (1) DE3483161D1 (de)
FI (1) FI76848C (de)
NZ (1) NZ210131A (de)
SE (1) SE452344B (de)
WO (1) WO1985002424A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE444826B (sv) * 1984-09-17 1986-05-12 Sunds Defibrator Anordning for vetskebehandling av massa
SE448890B (sv) * 1986-05-13 1987-03-23 Sunds Defibrator Anordning for tillforsel av vetska vid behandling av massa pa en endlos, lopande bana
AT394737B (de) * 1989-07-03 1992-06-10 Andritz Ag Maschf Verfahren und vorrichtung zur behandlung, insbesondere waesche, von faserstoff-fluessigkeit- mischungen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH392239A (de) * 1960-07-23 1965-05-15 Heimbach Gmbh Thomas Josef Filterbahn zur Blattbildung und zur Stoffentwässerung und -trocknung bei Papiermaschinen oder dergleichen
US3121660A (en) * 1961-02-13 1964-02-18 Jr Edward H Hall Fourdrinier wire and method of making the same
FR1477603A (fr) * 1966-03-03 1967-04-21 Bande sans fin pour les différentes machines d'une installation de fabrication du papier, du carton ou d'autres produits en feuilles à partir d'une pâte
AU502276B2 (en) * 1976-04-22 1979-07-19 Rederiaktiebolag Et Nordstjernan Dewatering press

Also Published As

Publication number Publication date
SE8306658L (sv) 1985-06-03
AU575883B2 (en) 1988-08-11
FI76848C (fi) 1988-12-12
EP0198825A1 (de) 1986-10-29
FI854787A0 (fi) 1985-12-03
AU3611684A (en) 1985-06-13
CA1265691A (en) 1990-02-13
WO1985002424A1 (en) 1985-06-06
DE3483161D1 (de) 1990-10-11
FI76848B (fi) 1988-08-31
SE8306658D0 (sv) 1983-12-02
JPS61500558A (ja) 1986-03-27
SE452344B (sv) 1987-11-23
NZ210131A (en) 1986-07-11
FI854787A (fi) 1985-12-03

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