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WO1997016591A1 - Tambour laveur a pression - Google Patents

Tambour laveur a pression Download PDF

Info

Publication number
WO1997016591A1
WO1997016591A1 PCT/CA1996/000667 CA9600667W WO9716591A1 WO 1997016591 A1 WO1997016591 A1 WO 1997016591A1 CA 9600667 W CA9600667 W CA 9600667W WO 9716591 A1 WO9716591 A1 WO 9716591A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
hub
deck
secured
plates
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/CA1996/000667
Other languages
English (en)
Inventor
Mark Tayler
Mohamed S. Gadala
Gary Hodgins
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.)
Tristar Industries Ltd
Original Assignee
Tristar Industries Ltd
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 Tristar Industries Ltd filed Critical Tristar Industries Ltd
Priority to AU71228/96A priority Critical patent/AU7122896A/en
Publication of WO1997016591A1 publication Critical patent/WO1997016591A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
    • 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
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward 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
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/72—Filters with filtering elements which move during the filtering operation having feed or discharge devices for feeding
    • 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
    • B01D33/74—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging filtrate

Definitions

  • the invention relates to the field of pressure washers used in the processing of cellulose fibre pulp, and more particularly to an improved drum design for pressure washers .
  • Rotary drum washers or filters are used in the manufacture of paper products from pulp.
  • a slurry of pulp fibres suspended in water and various chemical additives is formed from wood chips.
  • a sheet of pulp is formed from the slurry on the surface of a large drum by rotating the drum through the pulp slurry. The pulp sheet is then washed and de-watered on the outer surface of the drum, which has a perforated deck. The pulp sheet is then separated from the drum for further processing.
  • Two general types of rotary drum washers are in common use - vacuum washer drums and pressure washer drums. In the vacuum washer drum, low pressure is maintained between an inner and an outer deck to draw the filtrate from the pulp sheet towards the centre of the drum.
  • the drum In the pressure washer drum, the drum is housed in a pressure chamber so that the exterior of the drum is maintained at a higher pressure than the interior, to force the filtrate through the filter deck of the drum.
  • a prior art pressure washer is disclosed in United States Patent number 3,487,941 issued January 6, 1970 to Griffina- Repola Oy.
  • the cylindrical filter deck In pressure washer drums, the cylindrical filter deck has typically been supported on the axis of rotation by a number of annular spokes at either end of the drum. Such spokes are subjected to considerable forces, due to the combined weight of the drum and the external pressure on the surface of the drum, as well as rotational forces.
  • the invention provides a rotatable filter drum, for use in washing cellulose pulp under pressure compris ⁇ ing: i) a hub at either end of the drum; ii) a central shaft removably secured at either end thereof to the hub; iii) a cylindrical, perforated deck for support ⁇ ing a layer of pulp, supported on a plurality of annular rings coaxial to the shaft and longitudi ⁇ nal bars parallel to the shaft; iv) two parallel plates secured at their inner ends to each hub respectively and at their outer edges to the deck, each the plate having a spaced array of openings to permit fluid flow there ⁇ through; v) a plurality of radially extending ribs extend ⁇ ing longitudinally between the plates; vi) a circular ring extending between and adjacent the outer ends of the plates, and pro ⁇ vided with a plurality of apertures to permit fluid flow therethrough; and v) a journal coaxially secured to the outer end of each the hub.
  • Fig. 1 is a perspective view of the pressure washer drum of the invention shown mounted for rotation in a pressure washer, with the end seal plate removed;
  • Fig. IA is a cross-section along lines A-A of Fig. 1, with the end seal plate in place;
  • Fig. 2 is an end view of the pressure washer drum according to the invention, with the shroud removed and the interior structure shown in phantom outline;
  • Fig. 3 is a cross-section taken along lines 3-3 of Figure 1, with the central section omitted along broken lines;
  • Fig. 3A is a detail view in cross-section taken at line C of Figure 3.
  • Fig. 4 is a detail view of the hub of the invention.
  • the pressure washer drum of the invention is designated by reference numeral 10. It is suspended in the usual way on journals 74, 75 for rotation within a pressurized chamber 14, so that the interior of the drum 10 is at a lower pressure than the ex ⁇ terior.
  • the pulp slurry is pumped into the inlet headbox 15 at a consistency of 2-4% BD.
  • the pulp slurry forms a mat by dewatering as it travels with the drum through the forming zone 17.
  • the pulp mat is able to dewater in a relatively short time period compared to a vacuum washer due to the high pressure differential between the forming zone and the inside of the drum. Pressure ranges from 1.0 to 5.0 psig.
  • a lip seal or bottom seal 19 placed across the full width of the drum prevents flow of pulp into the bottom of the vat and forces all of the pulp flow to rotate clockwise around the drum upon leaving the inlet headbox. Upon rotation of the drum 10 therefore a sheet 18 of pulp fibres adheres to the surface 20 of the drum.
  • Surface 20 of the drum is perforated to permit filtrate to pass through the surface of the drum, to fall into the interior of the drum where it collects with the liquor in the tank 16.
  • surface 20 of drum 10 picks up the sheet 18 of pulp fibres which, after being drained of the filtrate, is separated from the surface 20 of drum 10 by knife edge 22 and falls into trough 24 for further processing.
  • the outer surface 20 of the drum consists of a perforated screen 26 which is supported on parallel circular ribs, referred to as fly- rings 28 and longitudinal bars 30.
  • the drum deck is supported by the end plates 32, 34.
  • End plates 32, 34 are each formed of two parallel circular plates of 3/4-inch steel, exterior end plates 40 and 44 and interior end plates 42 and 46.
  • Radial ribs 48 extend between the exterior and interior end plates.
  • Circular rings 50, 52 join the ends of each pair of end plates.
  • the inner edge 51, 53 of rings 50, 52 is extended and machined to a taper to provide a smooth transition of forces to the longi- tudinal bars 30.
  • a two-by-two array of four holes 55 is provided in circular rings 50, 52 in each compartment 54 formed by deck 20, ring 50 or 52 and adjacent longitudinal bars 30 and flyrings 28.
  • the filtrate is permitted to flow from the compartments 54 into the space 56 between the interior and exterior plates 40, 44 and 42, 46.
  • Both interior and exterior plates are provided with an array of openings 60 to permit the flow of filtrate between the interior of the drum and tank 13.
  • Tank 13 is separated from region 16 by the end seal subassembly 21.
  • Openings 62 are larger to permit workman access. The size and location of openings 60, 62 is selected to provide the maximum strength of the end plates at the points of highest stress while permitting the necessary flow of liquid.
  • FIG. 4 shows the hub design in greater detail.
  • Pipe 12 has stub shafts 64 of reduced diameter.
  • End plates 40, 42, 44, 46 are welded to hub 66 at locations 68.
  • Hub 66 has a hollow central channel 67.
  • a ring 70 is bolted to the end of hub 66 and retains ring seal 72 to seal the hub against stub shaft 64.
  • Stub shaft 64 is inserted as shown in centre 67 of hub 66 and one RINGFEDERTM locking device 69 is inserted between the wall of channel 67 and the surface of end 64 and is tightened to secure hub 66 to end 64.
  • Journal 74 at flange location 76 is bolted to hub 66 by bolts 78.
  • a shroud 80 is welded to packing sleeve 83 to cover bolts 78.
  • Journal 74 is mounted in bearing assembly 85 in stuffing box 84 secured to wall 86 of pressure chamber 14.
  • Ring 88 at the outer end of wall 86 supports an annular end seal 90 of TEFLONTM or the like which has sealing and sliding contact with the outer edge 92 of end plates 40, 44.
  • pipe 12 is secured to hub 66 without welding and the welds joining the hub to the end plates are remote from the axis at a region of lower stresses.
  • the welds between the spokes and the hub were close to the axis and failure was typically at that point.
  • the use of plates rather than spokes also serves to spread the stresses over the area of the plates.
  • the dissipation of stresses to the longitudinal bars is further improved by the tapering of extended edges 51 of rings 50, 52 and the installation of additional longitudinal bars 31 in the area adjacent to rings 50, 52.
  • the use of a bolt-on style journal allows the journal to be removed from the drum for maintenance, whereas in prior designs the entire drum had to be removed.

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

Dans les tambours laveurs à pression actuels, la paroi cylindrique filtrante est portée par l'arbre central au moyen de rayons soudés au moyeu central soudé à son tour à l'arbre. Les forces extrêmes produites provoquent une défaillance prématurée des soudures. La présente invention concerne un tambour laveur (10) à pression dans lequel des plaques parallèles (32) prises en sandwich ayant une série d'ouvertures remplacent les rayons, et un conduit central ainsi que des tourillons sont portés sur le moyeu par l'intermédiaire d'un système de boulons plutôt que par soudage.
PCT/CA1996/000667 1995-10-31 1996-10-07 Tambour laveur a pression Ceased WO1997016591A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU71228/96A AU7122896A (en) 1995-10-31 1996-10-07 Pressure washer drum

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002161851A CA2161851C (fr) 1995-10-31 1995-10-31 Tambour laveur a alimentation sous pression
CA2,161,851 1995-10-31

Publications (1)

Publication Number Publication Date
WO1997016591A1 true WO1997016591A1 (fr) 1997-05-09

Family

ID=4156886

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1996/000667 Ceased WO1997016591A1 (fr) 1995-10-31 1996-10-07 Tambour laveur a pression

Country Status (3)

Country Link
AU (1) AU7122896A (fr)
CA (1) CA2161851C (fr)
WO (1) WO1997016591A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1402216B1 (it) * 2010-10-05 2013-08-28 Filtra S R L Impianto di filtrazione industriale, particolarmente per liquidi lubro-refrigeranti per macchine utensili e simili, provvisto di tamburo forato rotante e di telo filtrante con funzione di tenuta
EP3578242B8 (fr) 2018-06-05 2021-09-08 ANDRITZ Separation GmbH Dispositif de filtration sous vide et/ou sous pression permettant de filtrer une suspension
EP3578241B1 (fr) * 2018-06-05 2021-09-01 ANDRITZ Separation GmbH Tambour filtrant pour un dispositif de filtration sous vide et/ou sous pression

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990010109A1 (fr) * 1989-02-23 1990-09-07 Beloit Corporation Appareil et procede de lavage de pate a papier
US5265447A (en) * 1991-12-17 1993-11-30 Kamyr, Inc. Drum washer sealing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990010109A1 (fr) * 1989-02-23 1990-09-07 Beloit Corporation Appareil et procede de lavage de pate a papier
US5265447A (en) * 1991-12-17 1993-11-30 Kamyr, Inc. Drum washer sealing

Also Published As

Publication number Publication date
AU7122896A (en) 1997-05-22
CA2161851A1 (fr) 1997-05-01
CA2161851C (fr) 1999-06-01

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