US3372087A - Self-cleaning sieve device in containers for cellulosic pulp - Google Patents

Self-cleaning sieve device in containers for cellulosic pulp Download PDF

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Publication number
US3372087A
US3372087A US360962A US36096264A US3372087A US 3372087 A US3372087 A US 3372087A US 360962 A US360962 A US 360962A US 36096264 A US36096264 A US 36096264A US 3372087 A US3372087 A US 3372087A
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United States
Prior art keywords
sieve
pulp
container
bodies
sieve bodies
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 - Lifetime
Application number
US360962A
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English (en)
Inventor
Johan C F C Richter
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.)
Metso Fiber Karlstad AB
Original Assignee
Kamyr AB
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Filing date
Publication date
Application filed by Kamyr AB filed Critical Kamyr AB
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Publication of US3372087A publication Critical patent/US3372087A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B01D25/38—Removal of the filter cakes by moving parts, e.g. scrapers, contacting stationary filter elements sprayers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/22—Directing the mixture to be filtered on to the filters in a manner to clean the filters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums

Definitions

  • an apparatus for deliquefying a pulp suspension in connection with a chemical treatment and/ or washing of the pulp wherein sieve bodies are disposed in a container and the pulp suspension moves through the container in an axial direction.
  • the sieve bodies are hollow and have sieve faces elongated in the direction of the pulp flow through which the liquid passes.
  • the sieve bodies are moved in the direction of the pulp flow at substantially the same rate as the pulp flow whereby washing liquids and/ or treating chemicals move horizontally towards the sieve bodies and in a direction transverse to the pulp flow. After a predetermined movement of the sieve bodies, they are rapidly returned to their initial position whereby the rapid movement of the sieve bodies opposite to the direction of pulp flow removes fibers that have stuck to the sieve faces.
  • the present invention relates to a sieve device in an upright cylindrical container adapted for axially directed continuous feed of a suspension of a comminuted fibrous material, preferably cellulosic pulp, which container comprises hollow sieve bodies arranged within the container and distributed over its cross-section and having essentially vertical faces for separating-01f a part of the liquid contents from the pulp.
  • a comminuted fibrous material preferably cellulosic pulp
  • the problem is solved in a fundamentally different manner, viz. by arranging the sieve bodies somewhat displaceable in the axial direction of the container, i.e. in the direction of flow of the pulp, so that they are free intermittently to accompany the pulp a small distance upwards in the axial direction of the container and to be brought back in the opposite direction.
  • the return of the sieve bodies in the direction opposite to the flow direction of the pulp is preferably performed by a rapid movement, whereby fibers that may have stuck to the sieve, will loose their engagement with the sieve faces, whereas during the intervening longer time periods the sieve bodies are allowed to accompany the pulp in its slow motion in the axial direction.
  • the sieve faces are thus maintained clean in a manner requiring merely comparatively simple means and a small amount of power.
  • the container is provided at its bottom with feeding devices (not shown) which cause the material to rise vertically up through the container.
  • Said discharging device may consist of a scraper composed of obliquely set blades 17 carried by radial arms U attached to a rotary vertical shaft 21.
  • Said shaft is arranged centrally in the container and its upper end is supported by a bearing 23 and driven by a motor 25 via a gear 27. If desired, the container could be closed at its upper end and held under a suitable super-atmospheric pressure.
  • the sieve arrangement essentially consists of two annular sieve bodies 29 and 31 which are concentric to each other and to the axis of the container and are located essentially at the same level.
  • Either sieve body consists of two mainly cylindrical sieve plates 41, 43 of slightly different diameters which are put into each other and joined at their upper and lower edges.
  • the distance between the sieve plates is considerably less than their axial extension and is chosen with regard thereto that the cavity formed between the sieve plates shall allow quite free flow of the liquid sieved-off and that the sieve body shall be of a sufiiciently resistant and rigid design.
  • the supporting arms 44, 46, 48 are tubular and their cavities 52 are connected to the cavities 47 and 49 of the sieve bodies.
  • the outer ends of said arms are connected by flexible hose sections 54 to an outer manifold 56 and a common outlet 58 for discharging such liquid as is separated off the pulp by means of the sieve bodies 29, 31.
  • an operating device for displacing the sieve bodies vertically in one and/ or the other direction.
  • said operating device is located outside the container and is arranged to act upon the protruding ends of the supporting arms 44, 46, 48.
  • a hydraulic or pneumatic cylinder 60 having a vertically movable piston 62 therein which is connected to a fitting 66 surrounding the end of the supporting arm, e.g. 46, and slidably guided between rails 64.
  • a pressure fluid is supplied simultaneously to the upper ends of the three cylinders 60 so that the supporting arms are moved uniformly downwards, thus displacing the sieve bodies rectilinearly and pushing their lower pointed edges down through the pulp. Due to the rapid movement of the sieve faces relatively to the pulp the latter rakes off such fibers as previously may have stuck in the sieve apertures. If desired, there may be inserted into the outlet 58 a valve which is closed simultaneously with said downward movement of the sieve bodies and which eliminates the pressure difference between the two sides of the sieve plates. This will further facilitate the release of particles stuck in the sieve faces so that the latter are disengaged from the pulp and can easily be brought to face a lower layer of the pulp.
  • said means consist of essentially vertically extending spray tubes 68, 70 extending downwardly from the arms of the scraper 19, and of a spray aperture 72 located upon the extended lower end of the shaft 21. Washing liquid taken from a conduit 74 is supplied through connections in the shaft 21 and in the scraper arms to the spray tubes 68, 70 and the aperture 72.
  • the ejection orifices of the spray tubes as well as the aperture 72 are located approximately at the level of the upper parts of the sieve bodies, so that the wash water and the liquid displaced thereby move essentially horizontally towards the sieve faces, i.e. in a direction transverse to the rising pulp, whereby the motion of the pulp is affected merely very slightly by the liquid flow therein.
  • the spray tubes 68, 70 are located approximately at the level of the upper parts of the sieve bodies, so that the wash water and the liquid displaced thereby move essentially horizontally towards the sieve faces, i.e. in a direction transverse to the rising pulp, whereby the motion of the pulp is affected merely very
  • the annular sieve bodies 29, 31 are carried by two radial supporting arms 75, 77, the outer ends of which are attached to the container wall 11 and the inner ends of which are attached to the hub 79 enclosing the rotary shaft 21 of the scraper 19.
  • a pin 81 upon the shaft 21 moves in a groove 83 in the hub formed like one turn of a helical thread and a vertical step. When the shaft 21 is turned, the pin 81 cooperates with the upper border of the helical groove 83 in the hub, thereby raising the hub, the supporting arms 75, 77 and the sieve bodies 29, 31.
  • the supporting arms are being elastically distorted and when the shaft 21 has turned almost one revolution so that the pin 81 reaches the vertical step of the groove 83, the tension of the supporting arms is released and said arms rapidly snap back to the lower end position, thereby pushing the sieve bodies a small distance down into the pulp.
  • the wash liquid is supplied by a number of nozzles 85 connected to separate supply tubes 87 located within the shaft 21 and within the arms 89 extending from the lower end of said shaft.
  • a sieve girdle 91 is inserted in the container wall 11 at the level of the sieve bodies 29, 31.
  • the rotary nozzles 85 are located at said level, too.
  • Device in which the sieve bodies are carried at least partially by a shaft arranged centrally in the container and serving for rotating a scraper, characterized in that the vertical motion of the sieve bodies is derived from the rotary motion of said shaft relatively to the sieve bodies.
  • an apparatus for treating a suspension of comminuted fiber material in a liquid medium comprising a cylindrical container for accommodating an axial fiow of the suspension, a set of sieve bodies located within said container in a spaced relation to the cylindrical wall thereof, said sieve bodies having apertured walls extending essentially in the axial direction of said container, conduit means connected to said sieve bodies and extending to the outside of said container for discharging liquid medium having passed through said apertured walls, and means mounting said set of sieve bodies for positively displacing said set of sieve bodies axially in at least the directon opposite to the direction of flow of said suspension.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US360962A 1963-05-20 1964-04-20 Self-cleaning sieve device in containers for cellulosic pulp Expired - Lifetime US3372087A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE555663A SE198496C1 (enrdf_load_stackoverflow) 1963-05-20 1963-05-20

Publications (1)

Publication Number Publication Date
US3372087A true US3372087A (en) 1968-03-05

Family

ID=20266725

Family Applications (1)

Application Number Title Priority Date Filing Date
US360962A Expired - Lifetime US3372087A (en) 1963-05-20 1964-04-20 Self-cleaning sieve device in containers for cellulosic pulp

Country Status (5)

Country Link
US (1) US3372087A (enrdf_load_stackoverflow)
DE (1) DE1636183B1 (enrdf_load_stackoverflow)
FI (1) FI44323B (enrdf_load_stackoverflow)
FR (1) FR1394570A (enrdf_load_stackoverflow)
SE (1) SE198496C1 (enrdf_load_stackoverflow)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595038A (en) * 1967-06-20 1971-07-27 Svenska Cellulosa Ab Apparatus for washing fibrous suspensions
US3873416A (en) * 1970-11-27 1975-03-25 Alkibiadis Karnis System for the continuous measurement of the weight-average fiber length of a pulp
US4041560A (en) * 1975-04-15 1977-08-16 Kamry Ab Method and device for dewatering of suspensions in movement
US4076623A (en) * 1976-12-07 1978-02-28 Kamyr, Inc. Continuous oscillation of liquid separator
FR2404706A1 (fr) * 1977-09-28 1979-04-27 Reed International Ltd Procede et installation pour laver la matiere fibreuse dans le desencrage du papier
US4172037A (en) * 1975-10-10 1979-10-23 Kamyr Inc. Continuous process diffuser
US4276167A (en) * 1979-04-25 1981-06-30 Kamyr Aktiebolag Diffuser arrangements
JPS56156430U (enrdf_load_stackoverflow) * 1980-04-21 1981-11-21
DE3310605A1 (de) * 1982-03-29 1983-09-29 Kamyr AB, 65115 Karlstad Fluessigkeitsbehandlung von zellstoff
EP0093293A1 (en) * 1982-05-04 1983-11-09 Oliver Armas Laakso Stationary diffuser
US4441224A (en) * 1982-05-04 1984-04-10 Laakso Oliver A Method of continuously treating a fibrous suspension
US4521315A (en) * 1984-01-24 1985-06-04 Laakso Oliver A Pulp thickening utilizing stationary screens
US4564144A (en) * 1982-05-04 1986-01-14 Laakso Oliver A Stationary diffuser
US4612286A (en) * 1980-02-19 1986-09-16 Kamyr, Inc. Acid hydrolysis of biomass for alcohol production
US5021127A (en) * 1987-12-01 1991-06-04 Kamyr, Inc. Extended delignification in pressure diffusers
US5066362A (en) * 1987-12-01 1991-11-19 Kamyr, Inc. Extended delignification in pressure diffusers
US6272710B1 (en) 1998-05-07 2001-08-14 James R. Prough Plate diffuser for treating comminuted cellulosic fibrous material
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI63076C (fi) * 1981-04-28 1983-04-11 Ahlstroem Oy Foerfarande och anordning foer rening eller silning av en materialsuspension

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1061767A (en) * 1911-09-25 1913-05-13 Stanley Paper Fibre Company Wood-pulp digester.
US1607013A (en) * 1926-05-04 1926-11-16 Meyerhofer Ferdinand Mechanical strainer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1315081A (fr) * 1961-11-27 1963-01-18 State Steel Products Appareil et procédé pour le triage des matériaux

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1061767A (en) * 1911-09-25 1913-05-13 Stanley Paper Fibre Company Wood-pulp digester.
US1607013A (en) * 1926-05-04 1926-11-16 Meyerhofer Ferdinand Mechanical strainer

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3595038A (en) * 1967-06-20 1971-07-27 Svenska Cellulosa Ab Apparatus for washing fibrous suspensions
US3873416A (en) * 1970-11-27 1975-03-25 Alkibiadis Karnis System for the continuous measurement of the weight-average fiber length of a pulp
US4041560A (en) * 1975-04-15 1977-08-16 Kamry Ab Method and device for dewatering of suspensions in movement
US4172037A (en) * 1975-10-10 1979-10-23 Kamyr Inc. Continuous process diffuser
US4076623A (en) * 1976-12-07 1978-02-28 Kamyr, Inc. Continuous oscillation of liquid separator
FR2404706A1 (fr) * 1977-09-28 1979-04-27 Reed International Ltd Procede et installation pour laver la matiere fibreuse dans le desencrage du papier
US4276167A (en) * 1979-04-25 1981-06-30 Kamyr Aktiebolag Diffuser arrangements
US4612286A (en) * 1980-02-19 1986-09-16 Kamyr, Inc. Acid hydrolysis of biomass for alcohol production
JPS56156430U (enrdf_load_stackoverflow) * 1980-04-21 1981-11-21
DE3310605A1 (de) * 1982-03-29 1983-09-29 Kamyr AB, 65115 Karlstad Fluessigkeitsbehandlung von zellstoff
US4705600A (en) * 1982-03-29 1987-11-10 Kamyr Ab Method for the treatment of pulp with liquid
US4441224A (en) * 1982-05-04 1984-04-10 Laakso Oliver A Method of continuously treating a fibrous suspension
US4564144A (en) * 1982-05-04 1986-01-14 Laakso Oliver A Stationary diffuser
US4468319A (en) * 1982-05-04 1984-08-28 Laakso Oliver A Stationary diffuser
EP0196578A3 (en) * 1982-05-04 1986-12-10 Oliver Armas Laakso Stationary diffuser
EP0093293A1 (en) * 1982-05-04 1983-11-09 Oliver Armas Laakso Stationary diffuser
US4521315A (en) * 1984-01-24 1985-06-04 Laakso Oliver A Pulp thickening utilizing stationary screens
US5021127A (en) * 1987-12-01 1991-06-04 Kamyr, Inc. Extended delignification in pressure diffusers
US5066362A (en) * 1987-12-01 1991-11-19 Kamyr, Inc. Extended delignification in pressure diffusers
US6272710B1 (en) 1998-05-07 2001-08-14 James R. Prough Plate diffuser for treating comminuted cellulosic fibrous material
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester

Also Published As

Publication number Publication date
DE1636183B1 (de) 1970-07-02
FI44323B (enrdf_load_stackoverflow) 1971-06-30
SE198496C1 (enrdf_load_stackoverflow) 1965-09-21
FR1394570A (fr) 1965-04-02

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