EP4484641A2 - Horizontaler pulper - Google Patents

Horizontaler pulper Download PDF

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Publication number
EP4484641A2
EP4484641A2 EP24180463.2A EP24180463A EP4484641A2 EP 4484641 A2 EP4484641 A2 EP 4484641A2 EP 24180463 A EP24180463 A EP 24180463A EP 4484641 A2 EP4484641 A2 EP 4484641A2
Authority
EP
European Patent Office
Prior art keywords
vat
rotor
horizontal
side wall
pulper
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.)
Pending
Application number
EP24180463.2A
Other languages
English (en)
French (fr)
Other versions
EP4484641A3 (de
Inventor
Timo HAUTANIEMI
Robert SCHIAVI
Sanjay Yallure
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
Valmet Technologies 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 Valmet Technologies Oy filed Critical Valmet Technologies Oy
Publication of EP4484641A2 publication Critical patent/EP4484641A2/de
Publication of EP4484641A3 publication Critical patent/EP4484641A3/de
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper

Definitions

  • the present invention relates to horizontal pulpers, especially in connection with pulp and fiber web production. More especially the invention relates to a horizontal pulper according to the preamble part of claim 1.
  • a typical production and treatment line comprises a forming section comprising a head box and a forming unit and a press section as well as a subsequent drying section and a reel-up.
  • the production and treatment line can further comprise other devices and sections for finishing the fiber web, for example, a size press, a calender, a coating section.
  • the production and treatment line also comprises typically at least one winder for forming customer rolls as well as a roll packaging apparatus.
  • a treatment system of the fiber suspensions for example comprises a pulping section, a deashing system, a detrashing system, a coarse filtering section, a centrifugal cleaning section, a fractionation section, a fine filtering system, a fiber thickening system and fiber refining systems.
  • fiber material is defibered to fiber pulp.
  • horizontal pulpers the process is carried out so that a fiber suspension inside, i.e. in a vat, of the pulper is caused to a rotating flow by at least one rotor.
  • the vat orientation is substantially horizontal or slightly inclined in longitudinal direction of the vat.
  • the material to be defibered is thus, fed inside the pulper through the rotators, which break the fibers and feed the fiber suspension into the vat of the pulper to the rotating flow.
  • the fiber suspension flow rises up in the vat and at some point, rotates back to the bottom of the vat and is defibered.
  • the aim of pulping is to separate fibers from each other as well as possible, and/or to keeping size of possible different impurities in the fiber suspension, such as plastic, glues etc., as large as possible to facilitate their separation from fiber pulp.
  • the rotor of the pulper is mounted to the pulper vat such that the centerline of rotation of the rotor is horizontal. This provides that the rotor has enough submergence depth in the vat. Thus, in cases, where mounting closer to the bottom of the vat is needed, this is usually accomplished by having a flat vat wall of the vat to mount the rotor on.
  • a disadvantage of this known pulper vat design is that the flat wall of the vat sets up a, generally, more rectilinear structure, which is disadvantageous as it requires more stiffeners and may also portend a less efficient hydrodynamic vat shape as compared to a cylindrical vat design also known from prior art. In these vat designs however, the centerline of the rotation of the rotor is at 30 degrees off from horizontal, which creates potential problems in the mounting of the driving motor and other mechanical elements external to the vat, for example in view of space requirements.
  • An object of the invention is to create a horizontal pulper, in which the disadvantages and problems of prior art pulper designs are eliminated or at least minimized.
  • an object of the invention is to create a horizontal pulper with a lighter structure.
  • an object of the invention is to create a horizontal pulper with an efficient hydrodynamic shape.
  • an object of the invention is to create a horizontal pulper, in which the disadvantages and problems in the mounting of the driving motor and other mechanical elements external to the vat caused by the rotor mounting are eliminated or at least minimized.
  • the horizontal pulper comprises a vat and at least one rotor, which has a cylindrical design extending from a first end to a second end, which vat has an open top part, a bottom part and side walls, and which vat comprises an opening on the side wall for the rotor, wherein the rotor is mounted to the opening on the side wall by a mounting collar such, that the center line of the rotor is horizontal.
  • the mounting collar is conical and to the side wall attached mounting edge of the mounting collar is fitted to the curvilinear form of the side wall of the vat providing a tangential feed to the vat.
  • the conical form of the mounting collar extends from the side wall of the vat outwards and is convergent from the side wall outwards. Further advantageously, the distance from the side wall to outer edge of the mounting collar and the diameter of the mounting collar vary depending on the size of the rotor to be mounted.
  • the vat further comprises flow guides arranged inside the vat in vicinity of the rotor.
  • two flow guides in vicinity of the rotor is provided two flow guides: a first flow guide and a second flow guide mounted at vicinity of the mounting edge of the mounting collar for the rotor, the first flow guide extends towards the bottom part of the vat and the second flow guide extends towards the top part of the vat.
  • the flow guides have a curved form.
  • the first end and the second end have a calotte form with dome-form outwards from the vat.
  • fiber suspensions means liquids and suspensions, which contain fibers to be defibered and possible other occurring ingredients, which are meant to be filtered out.
  • the fibers can be synthetic or non-synthetic fibers.
  • the fibers in connection with pulp and fiber web production usually mean recycled cellulose fibers, but also newly produced cellulose fibers can come into question.
  • the horizontal pulper according to the invention is suitable for different types of fiber suspensions of synthetic and/or non-synthetic fiber material.
  • This new design having the cylindrical vat and horizontal rotor mounting provides thus lighter structure as less stiffeners are needed, and thus, production costs of the pulper are significantly decreased, due to the cylindrical form and efficient hydrodynamic vat shape due to the cylindrical form as well as easy and in view of space requirements of mounting of the driving motor and other mechanical elements external to the vat well-functioning structure due to the horizontal rotor mounting.
  • the mounting collar of the rotor creates a tangential feed into the vat providing efficient hydrodynamic flow conditions.
  • advantageous flow guides provided inside the vat improve the flow dynamics within the vat.
  • FIG. 1 - 4 is schematically shown a pulper 10 comprising a vat 11.
  • the pulper 10 is supported by support structures 14 on a floor or a corresponding base.
  • the pulper 10 is a horizontal pulper and thus, orientation of the vat 11 is substantially horizontal or slightly inclined in longitudinal direction of the vat 11.
  • the vat 11 has a cylindrical design, in which the cylindrical form extends from a first end 12 of the vat 11 to a second end 13 of the vat 11.
  • the cylindrical design provides efficient hydrodynamic vat shape.
  • the vat 11 comprises openings 20 for rotors 15 on a side wall 16 of the vat 11.
  • the side wall 16 extends in the longitudinal direction of the vat 11 from the first end 12 to the second end 13.
  • the side wall 16 is circular due to the cylindrical design of the vat 11.
  • the side wall 16 is between the support structures 14 of the vat 11 and a top part 17 of the vat 11.
  • the top part 17 is open and thus, the cylindrical form is cut at the top part 17 of the vat 11 by a horizontal plane.
  • the rotors 15 are mounted to the side wall 16 at the openings 20 by mounting collars 21.
  • the mounting collar 21 mounts the rotor 15 such, that center line C ( fig 2 ) of the rotor 15 is horizontal.
  • a driving motor 30 ( fig. 4 ) and other external mechanical elements have well space.
  • the mounting collar 21 is attached to the side wall 16 advantageously by welding.
  • Form of the mounting collar 21 is conical and to the side wall 16 attached edge 22 is fitted to the curvilinear form of the side wall 16 of the vat 11 and thus, a tangential feed to the vat 11 is provided, which provides efficient hydrodynamic flow conditions for the fiber suspension flow inside the vat 11.
  • the rotors 15 are thus separate units from the vat 11, which provides for a steady arrangements.
  • the conical form of the mounting collar 21 extends from the side wall 16 of the vat 11 outwards and is convergent from the side wall 16 outwards. Further advantageously, the distance from the side wall 16 to outer edge of the mounting collar 21 and the diameter of the mounting collar 21 vary depending on the size of the rotor 15 to be mounted.
  • the vat 11 also comprises inside arranged flow guides 25, 26 for intensify and guide the fiber suspension flow inside the vat 11 such, that possible "dead corners" and slowing effects are avoided.
  • a first flow guide 25 and a second flow guide 26 In vicinity of each of the rotors 15 is provided two flow guides: a first flow guide 25 and a second flow guide 26.
  • the flow guides 25, 26 are mounted at vicinity of the mounting edge 22 of the mounting collar 21 and comprise the first flow guides 25 extending towards a bottom part 18 of the vat 11 from the lower mounting edge 22 of the mounting collar 21 and the second flow guides 26 extending towards the top part 17 of the vat 11 from the upper mounting edge 22 of the mounting collar 21.
  • the flow guides 25, 26 have a curved form.
  • the curved forms of the first flow guides 25 is extend as a convex form from the mounting collar 21 towards the bottom part 18 and the curved forms of the second flow guides 26 extend as a concave form from the top part 17 towards the mounting collar 21.
  • the flow guides 25, 26 are thus, correspondingly extending inclined.
  • the flow guides 25, 26 are substantially planar flap-like parts and extend from the side wall 16 inside the vat 11.
  • the flow guides 25, 26 are advantageously curved parts formed of plate-like material.
  • the flow guides 25, 26 are configured to guide the flow towards or away from the rotor/- s 15.
  • the first end 12 and the second end 13 have advantageously calotte form with dome-form outwards from the vat 11, which further improves strength of the vat 11 and further less stiffeners are needed.
  • the rotor 15 is attached to a driving motor 30 for providing power for the rotating movement of the rotor 15.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP24180463.2A 2023-06-26 2024-06-06 Horizontaler pulper Pending EP4484641A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US202363510168P 2023-06-26 2023-06-26

Publications (2)

Publication Number Publication Date
EP4484641A2 true EP4484641A2 (de) 2025-01-01
EP4484641A3 EP4484641A3 (de) 2025-06-04

Family

ID=91433199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24180463.2A Pending EP4484641A3 (de) 2023-06-26 2024-06-06 Horizontaler pulper

Country Status (2)

Country Link
EP (1) EP4484641A3 (de)
FI (1) FI131166B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB677787A (en) * 1949-08-17 1952-08-20 Millspaugh Ltd Improvements in or relating to machines for breaking and mixing paper-making materials
NL140020B (nl) * 1968-06-21 1973-10-15 Kobayashi Tadashi Inrichting voor het zuiveren van papiergrondstof.
DE10138860A1 (de) * 2001-08-08 2003-02-27 Voith Paper Patent Gmbh Verfahren zur Suspensionsführung in einem Papierstofflöser sowie Papierstofflöser zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
EP4484641A3 (de) 2025-06-04
FI20235998A1 (de) 2024-11-13
FI131166B1 (en) 2024-11-13

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