WO1994004746A1 - Agencement d'egouttage - Google Patents

Agencement d'egouttage Download PDF

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Publication number
WO1994004746A1
WO1994004746A1 PCT/SE1993/000661 SE9300661W WO9404746A1 WO 1994004746 A1 WO1994004746 A1 WO 1994004746A1 SE 9300661 W SE9300661 W SE 9300661W WO 9404746 A1 WO9404746 A1 WO 9404746A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe lines
arrangement
plate
pulp
dewatering
Prior art date
Application number
PCT/SE1993/000661
Other languages
English (en)
Inventor
Leif Petersson
Original Assignee
Sunds Defibrator Industries Aktiebolag
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 Aktiebolag filed Critical Sunds Defibrator Industries Aktiebolag
Priority to AU47667/93A priority Critical patent/AU4766793A/en
Publication of WO1994004746A1 publication Critical patent/WO1994004746A1/fr

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
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B01D29/118—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration open-ended
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/904—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding directing the mixture to be filtered on the filtering element in a manner to clean the filter continuously
    • 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

Definitions

  • This invention relates to an arrangement for dewatering a pulp suspension, preferably in the form of cellulose- -containing fiber material in a liquid.
  • the fiber material is repeatedly diluted in order to adjust the material to the treatment carried out in different processing steps.
  • the dewatering can be carried out in different ways and with varying equipment.
  • pulp suspensions with low concentration for example 0.5-3%
  • suction filters of different types are used. It is also known to dewater pulp suspensions during their transport through perforated cylinders and pipe lines.
  • the present invention offers a solution of the aforesaid problems. It consists of a simple and effective arrangement comprising a plurality of pipe lines with liquid-permeable walls for dewatering a pulp suspension where the discharge of the dewatered pulp, and thereby the dewatering capacity, can be controlled effectively.
  • the characterizing features of the invention are apparent -from the attached claims.
  • the arrangement comprises a plurality of substantially vertical pipe lines with an upper and a lower end.
  • the pipe lines have liquid-permeable walls for dewatering the pulp suspension and are located in a mutually spaced re ⁇ lationship within an area defined by a cylindric wall ele ⁇ ment.
  • the walls of the pipe lines can consist of perforated sheet metal or of screen cloth, such as wire gauze of plastic material.
  • the pulp can be advanced upward or downward through lbhe pipe lines. Adjacent the discharge end of the pipe lines a rotary horizontal plate is located, which is provided with apertures so that the plate upon its rotation alternatingly opens and closes the discharge openings for simultaneously controlling the pulp feed and the de- watering in the pipe lines.
  • Fig. 1 is a schematic cross-section of an arrangement acc ⁇ ording to the invention
  • Fig. 2 is a section according to II-II in Fig. 1 , Figs. 3 and show two alternative embodiments.
  • the dewatering arrangement according to Fig. 1 comprises a plurality of vertical pipe lines 10 of perforated sheet metal or wire.
  • the lines are located in a mutually spaced relationship within an area defined by a cylindric wall element 11.
  • a chamber 12 is connected to the upper end of the wall element and of the pipe lines.
  • the pipe lines are connected to corresponding openings in the bottom of said chamber.
  • a lower chamber 13 is connected in a corresponding way to the lower end of the wall element 11 and of the pipe lines 10.
  • the chambers 12 and, respectively, 13 are prov ⁇ ided with openings 1 - and, respectively, 15 for the supply alternatively removal of the pulp suspension.
  • An outlet 16 is located in the lower portion of the wall element 11.
  • a rotary plate 17 is located horizont ⁇ ally.
  • the plate is mounted on a shaft, which extends through the lower chamber 13 and is driven by a motor (not shown).
  • the plate 17 is circular and extends substantially across the entire cross-section of the cylindric wall element 11.
  • the plate is provided with apertures 19 so positioned that the plate 17 upon its rotation alternatingly opens and closes the communication of the pipe lines 10 with the chamber 13 lying below.
  • the open area must be adjusted to the dwell time of the pulp and its flow through the pipe lines 10.
  • the apertures 19 preferably can have the same cross-section as the lower end of the pipe lines 10. Altern atively, the apertures 19 can have the shape of circle sectors in the plate but, of course, also other shapes of the apertures can be imagined.
  • a rotary plate 21 can be placed horizontally in the upper chamber 12 ad ⁇ jacent the upper end of the pipe lines 10.
  • This upper plate 21 is attached on a rotary shaft 22 driven by a motor (not shown).
  • the plate 21 is provided with apertures 23 according to the above description of the lower plate 17.
  • This embodiment is illustrated in Fig. 3- In all other respects, this embodiment corresponds to the embodiment shown in Fig. 1.
  • a further alternative embodiment is shown in Fig. 4- where there is no lower plate, and only the upper plate 21 is installed. This embodiment corresponds in all other respects to the emobodiment ' ⁇ in Fig. 1 and is intended for feed upward from below.
  • the cross-section of the pipe line 10 is constant along their entire length. It can, however, be suitable to design the pipe lines with increasing cross- -section in the feed direction.
  • the diameter of the pipe lines and their mutual spaced relationship should be in the interval 4-0-250 mm.
  • the pipe wall can be made of sheet metal with 1-5 mm apertures or slits, alternatively of wire gauze.
  • the arrangement can be given a very great length, and thereby a very great height, for example 3-100 m
  • One advantage of giving the .arrangement a great height is, that the dewatering capacity can be increased without having to increase the necessary floor space for the arrangement.
  • the lower plate 17 will control the discharge of the dewatered pulp (Figs. 1 and 3)- Inversely, the upper plate 21 will control the discharge when the pulp suspension is supplied through the lower chamber 13 (Fig. 4-) • In both cases,the dewatering takes place through the liquid-perm ⁇ eable walls of the pipe lines 10. The liquid is collected in the space between the pipe lines 10 and wall element 11 and is discharged through the outlet 16. At upward as well as at downward flow, there is risk that a pulp layer with higher concentration accumulates nearest to the walls of the pipe lines and thereby prevents continued dewatering through the walls or renders it difficult. Pulp suspension with low concentration can flow centrally along the pipe lines without being dewatered.
  • the upper plate 21 is intended to close the inlet to the pipe lines 10 at the same time as the lower plate 17 opens the outlet of the pipe lines in order to facilitate the discharge.
  • the dewatering can be controlled so that a desired concen ⁇ tration of the dewatered outgoing pulp is obtained.
  • the invention is not restricted to the embod ⁇ iments shown, but can be varied within the scope of the invention idea.

Landscapes

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

Abstract

Agencement d'égouttage de pâte à papier en suspension. L'agencement comprend une multiplicité de conduits verticaux (10), pourvus d'une extrémité d'entrée et d'une extrémité de sortie, qui sont reliés respectivement à des chambres supérieure et inférieure (respectivement 12 et 13). Les conduits sont composés de parois perméables aux liquides, et sont placés dans une zone définie par une paroi cylindrique (11). Une plaque horizontale rotative (17, 21), pourvue d'orifices (19, 33), est placée de manière contiguë par rapport à l'extrémité de sortie des conduits (10) de sorte qu'en tournant, elle ouvre et referme alternativement lesdites extrémités de sortie afin de réguler simultanément l'alimentation en pâte et l'égouttage dans les conduits.
PCT/SE1993/000661 1992-08-18 1993-08-11 Agencement d'egouttage WO1994004746A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47667/93A AU4766793A (en) 1992-08-18 1993-08-11 Dewatering arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9202365-4 1992-08-18
SE9202365A SE470444B (sv) 1992-08-18 1992-08-18 Avvattningsanordning innefattande vertikala rörledningar

Publications (1)

Publication Number Publication Date
WO1994004746A1 true WO1994004746A1 (fr) 1994-03-03

Family

ID=20386942

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1993/000661 WO1994004746A1 (fr) 1992-08-18 1993-08-11 Agencement d'egouttage

Country Status (3)

Country Link
AU (1) AU4766793A (fr)
SE (1) SE470444B (fr)
WO (1) WO1994004746A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016215185A (ja) * 2016-03-02 2016-12-22 東洋スクリーン工業株式会社 連続ろ過装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539094C (de) * 1931-11-20 Buckau R Wolf Akt Ges Maschf Filterpatronen-Eindicker
US2985306A (en) * 1959-09-30 1961-05-23 Bendix Corp Fluid filter
EP0122867A2 (fr) * 1983-04-18 1984-10-24 Mott Metallurgical Corporation Système de lavage-à-reflux pneumatique-hydraulique pour filtre et procédé de fonctionnement
EP0274690A1 (fr) * 1986-12-17 1988-07-20 A. Ahlstrom Corporation Procédé et appareil d'épaississage d'une suspension fibreuse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE539094C (de) * 1931-11-20 Buckau R Wolf Akt Ges Maschf Filterpatronen-Eindicker
US2985306A (en) * 1959-09-30 1961-05-23 Bendix Corp Fluid filter
EP0122867A2 (fr) * 1983-04-18 1984-10-24 Mott Metallurgical Corporation Système de lavage-à-reflux pneumatique-hydraulique pour filtre et procédé de fonctionnement
EP0274690A1 (fr) * 1986-12-17 1988-07-20 A. Ahlstrom Corporation Procédé et appareil d'épaississage d'une suspension fibreuse

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016215185A (ja) * 2016-03-02 2016-12-22 東洋スクリーン工業株式会社 連続ろ過装置

Also Published As

Publication number Publication date
SE9202365L (sv) 1994-02-19
SE9202365D0 (sv) 1992-08-18
AU4766793A (en) 1994-03-15
SE470444B (sv) 1994-03-28

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