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WO2024096784A1 - Usine de pâte - Google Patents

Usine de pâte Download PDF

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Publication number
WO2024096784A1
WO2024096784A1 PCT/SE2023/051069 SE2023051069W WO2024096784A1 WO 2024096784 A1 WO2024096784 A1 WO 2024096784A1 SE 2023051069 W SE2023051069 W SE 2023051069W WO 2024096784 A1 WO2024096784 A1 WO 2024096784A1
Authority
WO
WIPO (PCT)
Prior art keywords
arrangement
pulp mill
screening
pulp
reject
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/SE2023/051069
Other languages
English (en)
Inventor
Jan ELIASSON
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
Valmet AB
Original Assignee
Valmet Oy
Valmet 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 Valmet Oy, Valmet AB filed Critical Valmet Oy
Publication of WO2024096784A1 publication Critical patent/WO2024096784A1/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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/24—Continuous processes
    • 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
    • D21C7/00—Digesters
    • D21C7/08—Discharge devices
    • 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
    • D21C7/00—Digesters
    • D21C7/14—Means for circulating the lye
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes

Definitions

  • the invention relates to the field of pulp mills for producing cellulose pulp, for example using the Kraft process.
  • Pulp mills for carrying out processes such as the Kraft process and sulfite process are well known in the art.
  • Pulp mills comprise a plurality of devices such as reactors, towers and washing devices to be able to carry out the process.
  • the relative placement of the devices varies depending on the customer’s needs, but in general, the devices are arranged in accordance with the process flow and form a pulp mill having an elongated footprint, typically with the cooking arrangement (digester etc.) at a first short end of the pulp mill, and pulp storage towers for the end-product (bleached/delignified cellulose pulp) at a second (opposite) end of the pulp mill.
  • the reject handling is typically placed at a side (long end) of the pulp mill to allow convenient removal of the portion of the reject which cannot be recirculated to the digester.
  • An object of the invention is to provide a pulp mill which is improved in terms of allowing simplified maintenance and/or in terms of having a more compact layout, i.e. having a smaller footprint.
  • a pulp mill comprising a screening arrangement for screening pulp cooked from wood chips, a reject handling arrangement connected to the screening arrangement to receive a reject therefrom, the reject handling arrangement being arranged to convey at least portion of the reject to storage means for disposal thereof, and a washing arrangement comprising at least one washing device connected to the screening arrangement, the at least one washing device being configured to wash atleast a portion of an accept received from the screening arrangement.
  • the reject handling arrangement, the screening arrangement and the washing arrangement are arranged consecutively within an elongated area portion of the pulp mill, such as on an elongated platform.
  • the pulp mill comprises a cooking arrangement, which is arranged to receive wood chips and to subject the wood chips to a cooking process to produce pulp, wherein the screening arrangement is arranged to receive pulp from the cooking arrangement
  • the reject handling arrangement, the screening arrangement and the washing arrangement are arranged consecutively, i.e. after one another along a line (which preferably is substantially straight) within an area portion of the pulp mill which is substantially longer than wide (since the arrangements are arranged consecutively).
  • the area portion may be defined by an elongated (raised) platform on which the reject handling arrangement, the screening arrangement and the washing arrangement are arranged.
  • Such arrangements are advantageously arranged on a platform since this allows one or more material flows therefrom to be conveyed by means of gravity.
  • the area portion or elongated platform may extend substantially from one short end of the pulp mill to its opposite short end.
  • the optional cooking arrangement may be arranged to subject the wood chips to a kraft cooking process to produce the pulp.
  • the reject handling arrangement is arranged to convey at least portion of the reject to storage means to allow removal of part of the reject which consequently is not recirculated to the cooking arrangement (to the digester or blow tank for instance).
  • Reject handling arrangements are known in the art and may for example comprise a coarse reject handling system (for coarse reject handling) and/or a sludge handling system (for handling fine rejects).
  • the coarse reject handling system may comprise one or more screw presses.
  • the sludge handling system may comprise for example flocculation tank(s) and/or rotary screen thickener(s) and/or screw press(es).
  • the invention may alternatively be described in that the reject handling arrangement, the screening arrangement and the washing arrangement are arranged consecutively along a line (which may be substantially straight) extending in the direction from one short end of the pulp mill to the other.
  • an arrangement being arranged at or adjacent a side or long end of the elongated area/platform does notnecessarily imply that the arrangement is in abutment or direct contact with the area/platform but may also comprise embodiments where one or more additional devices are disposed between the area/platform and the arrangement.
  • the washing arrangement may comprise additional washing devices, for instance washing devices connected to delignification reactors and/or bleaching towers for washing the output therefrom.
  • the washing arrangement may, but does not necessarily, comprise all washing devices of the pulp mill.
  • the inventors have realized that by arranging not only the screening and washing arrangements consecutively, but also the reject handling arrangement, for instance on an elongated platform, access to the arrangements may be improved such that maintenance is simplified. Furthermore, simplified piping may be achieved.
  • the pulp mill further comprises an overhead or gantry crane arrangement being displaceable along a lengthwise direction of area or platform, the crane arrangement being configured to co-act with the screening arrangement, the washing arrangement and the reject handling arrangement.
  • the overhead crane arrangement may comprise a bridge comprising one or more beams which is travelling (for example using wheels, sliding means or the like) along an overhead fixed runway/rail structure extending along the lengthwise direction of the elongated area or platform, and where one or more trollies or sliding devices, such as two trollies/sliding devices, is/are displaceable along the bridge in a substantially perpendicular direction to the runway/rail structure.
  • One or more, or each of the trollies/sliding devices may comprise or support a hoisting mechanism.
  • the runway/rail structure may for example be connected to the long end walls of a building structure enclosing the elongated area or platform.
  • the gantry crane arrangement may correspond to the above-described overhead crane arrangement except that the bridge is supported by legs to form a substantially U-shaped element which travels on a (non-overhead) fixed runway/rail structure extending along the lengthwise direction of the elongated area or platform, for instance at a base of the area or platform.
  • the cooking arrangement is disposed at/adjacent a first long side of the area/platform, i.e. the cooking arrangement is arranged at one side (long end) of the area/platform, i.e. to the side of one or more of the reject handling arrangement, the screening arrangement and the washing arrangement
  • the cooking arrangement is thus arranged at a long end/side of the pulp mill to the side of one or more of the reject handling arrangement, the screening arrangement and the washing arrangement
  • the reject handling arrangement is disposed at a short end of said elongated area or platform such that said storage means is accessible from said short end.
  • the storage means may for example comprises containers or other types of vessels.
  • the reject handling arrangement is disposed on an elongated (raised) platform, the storage means is arranged below (wholly or at least partly beneath) the platform to allow easy access for vehicles and to allow conveying the reject to the storage means by gravity.
  • the pulp mill further comprises one or more electrical feeding arrangements connected to at least one of the cooking, screening, reject handling and washing arrangements to provide electrical power thereto, wherein at least one of the electrical feeding arrangements is disposed at a second long side of the platform, the second long side being opposite the first long side.
  • the pulp mill further comprises pulp storage means being arranged to receive washed pulp directly or indirectly from the washing arrangement, said pulp storage means being disposed at a first long side of the platform.
  • the pulp storage means may comprise storage towers which may have a height to diameter ratio being greater than 2,5:1.
  • the pulp mill further comprises a delignification arrangementand/or a bleaching arrangement being arranged at/adjacent said first long side.
  • the washing arrangement may further comprise at least one additional washing device, each being arranged to co-act with the delignification arrangement and/or a bleaching arrangement, for instance in the sense that the additional washing device is arranged to receive delignified or bleached pulp from a delignification or bleaching reactor.
  • the delignification arrangement and/or a bleaching arrangement may comprise one or more devices (such as reactors) having a height to diameter ratio being greater than 2,5:1.
  • the cooking arrangement comprises an impregnation tower, a digester and a blow tank. At least one, or each, of the impregnation tower, digester and blow tank may have a height to diameter ratio being greater than 2,5:1.
  • the reject handling arrangement is furthermore arranged to convey at least part of the reject to feeding means for recirculation back to said digester or blow tank.
  • the reject may be recirculated to the digester in the form of a suspension.
  • Such recirculation and the devices (pumps etc.) are well known in the art and will not be described in further detail here.
  • the reject handling arrangement may also comprise treatment means for treating the reject prior to recirculation.
  • the means for treating may for example comprise chopper(s) or grinder(s) for disintegrating knots and/or rejectvessel(s) in which the reject is treated with a treatment liquid.
  • the screening arrangement comprises at least one coarse screening device and at least one fine screening device.
  • the screening arrangement may furthermore or alternatively comprise a combined coarse and fine screening device.
  • Such screening devices are well-known in the art and will not be described in further detail here.
  • each constituent part of the pulp mill having a height to diameter ratio greater than 2,5:1 is disposed at said first long side of the platform. This maybe advantageous since piping is simplified and since maintenance may be more convenient
  • fig. 1 shows a schematic top view of an embodiment of the pulp mill according to the invention
  • fig. 2 shows a schematic side view of parts (the platform, a washing device and the gantry crane) of the embodiment in fig. 1.
  • Fig. 1 shows a schematic top (2D) view of an embodiment of the pulp mill according to the invention.
  • the pulp mill comprises a cooking arrangement 1 arranged to subject the wood chips to a Kraft pulping process.
  • the cooking arrangement comprises an impregnation tower la arranged to receive wood chips and to impregnate the wood chips with cooking liquor, a pressurized digester lb and a blow tank lc to which the finished cooked wood chips are blown.
  • the pulp mill furthermore comprises a screening arrangement 2, a reject handling arrangement 3a-b and a washing arrangement 4 which are all arranged consecutively on an elongated platform 5.
  • the cooking arrangement 1 is disposed at a first long side 5b of the platform.
  • the pulp from the blow tank is fed to the screening arrangement 2 which comprises a fine screening device and a coarse screening device.
  • the reject from the screening arrangement is fed to the reject handling arrangement 3a-b, the reject handling arrangement being arranged to convey at least portion of the reject to storage means in the form of containers 3c-d for disposal thereof.
  • the reject handling arrangement is disposed at a short end 5a of the elongated area or platform such that the storage containers are accessible from the short end.
  • the containers 3c-d are arranged below the platform 5.
  • the reject handling arrangement 3a-b is arranged to convey at least part of the reject to feeding means, which may be considered part of the reject handling arrangement, for recirculation back to the cooking arrangement (impregnation tower or blow tank).
  • the reject handling arrangement 3a-b may comprise one or more of the following: screw press(es), flocculation tank(s), rotary screen thickener(s), chopping device(s) and/or reject treatment vessel(s).
  • the washing arrangement 4 comprises two serially arranged washing devices 4a being twin-roll presses connected to the screening arrangement 2 configured to wash at least a portion of an accept from the screening arrangement 2 in two stages.
  • the washed pulp from the washing devices 4a is fed to a delignification arrangement 9 comprising a first oxygen delignification reactor 9a, a second oxygen delignification reactor 9b which is connected to a blow tank 9c and a medium consistency (MC) tower 9d.
  • the delignification arrangement co-acts with washing devices 4b (also twin-roll presses) of washing arrangement 4.
  • washing devices 4b also twin-roll presses
  • one or two washing devices is/are connected between the blow tank 9c and the MC tower 9d, and a washing device is arranged after the MC tower 9d.
  • the delignified pulp is fed from the MC tower of the delignification arrangement 9 to the bleaching arrangement 10.
  • the bleaching arrangement comprises three serially arranged bleaching towers (DO, EOP, DI as seen from the right to the left).
  • the bleaching arrangement co-acts with washing devices 4c (also twin-roll presses) of washing arrangement 4, a first washing device being connected between the DO and EOP bleaching towers, a second washing device between the EOP and DI bleaching towers, and the third between DI bleaching tower and the pulp storage towers 8a, 8b.
  • the DO bleaching stage may be replaced with a Dht stage
  • the EOP bleaching stage may be replaced with a EO or EP stage.
  • the delignification arrangement 9, the bleaching arrangement 10 and the pulp storage towers 8a- b are all arranged at the first long side 5b of the platform 5.
  • An electrical feeding arrangement 7a is connected to the screening, reject handling and washing arrangements to provide electrical power thereto.
  • the electrical feeding arrangement 7a is arranged at a second long side 5c of the platform, the second long side being opposite the first long side 5b.
  • the pulp mill further comprises a gantry crane arrangement being displaceable along a lengthwise direction of platform 5, the crane arrangement being configured to co-act with the screening arrangement, the washing arrangement and the reject handling arrangement.
  • the gantry crane arrangement comprises a bridge 6a formed by two parallel beams, which bridge is supported/elevated at its ends by legs 6c to form a substantially U-shaped element which travels on a fixed runway/rail structure 6d-e extending along both long ends 5b-c, i.e. in the lengthwise direction of the elongated platform.
  • Two trollies 6b, 6b’ each supporting a hoisting mechanism is displaceable along the bridge in a substantially perpendicular direction to the runway/rail structure 6d-e.
  • the pulp mill further comprises liquor buffer tanks 12a, 12b and filtrate tanks lla-e.
  • the tank 12b has a height to diameter ratio greater than 2,5:1, which means that it is arranged at the first long side 5b, whereas the tanks lla-e and 12a each has a height to diameter ratio smaller than 2,5:1, which means that they are all arranged at the second long side 5 c.
  • the pulp mill optionally comprises an additional electrical feeding arrangement 7b for feeding the adjacent cooking arrangement 1, and a heat exchanging arrangement 13 (also co-acting with the cooking arrangement).
  • Fig. 2 shows a schematic side view of parts of the embodiment in fig. 1 (as seen from the left in fig. 1).
  • the platform 5 is seen, which is raised above the ground level by means of being supported by leg portions 5a, 5b.
  • One of the washing devices 4c (a twin-roll press) of washing arrangement 4 is schematically shown arranged on the platform 5.
  • the above-described gantry crane arrangement is shown in more detail.
  • the gantry crane arrangement comprises a bridge 6a formed by two parallel beams (only one is seen in the side view in fig.
  • the bridge is supported/elevated at its ends by legs 6c, 6c’, wherein wheels 6f, 6f’ are provided at the lower ends of the legs 6c, 6c’ such as to travel on a fixed runway/rail structure 6d, 6e.
  • Two trollies 6b, 6b’ each supporting a hoisting mechanism are displaceable along the bridge in a lateral direction (substantially perpendicular to the runway/rail structure 6d-e). Consequently, the trollies/hoisting mechanisms are displaceable both in the lengthwise and lateral direction of the platform and can co-act with the screening arrangement, the washing arrangement, and the reject handling arrangement, for example to conduct maintenance work thereon.
  • the hoisting mechanism can be used to engage with and lift a roll/drum from the twin-roll press 4c for repair or replacement

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Paper (AREA)

Abstract

Usine de pâte comprenant un agencement de tamisage (2) pour tamiser une pâte, un agencement de traitement de rejet (3a-b) relié à l'agencement de tamisage pour recevoir un rejet provenant de celui-ci, l'agencement de traitement de rejet étant conçu pour transporter au moins une partie du rejet vers un moyen de stockage en vue de son élimination, et un agencement de lavage (4) relié à l'agencement de tamisage, l'agencement de lavage étant conçu pour laver au moins une partie d'un accepté provenant de l'agencement de tamisage. L'agencement de traitement de rejet, l'agencement de tamisage et l'agencement de lavage sont agencés consécutivement à l'intérieur d'une partie de zone allongée de l'usine de pâte, par exemple sur une plateforme allongée. Un agencement de pont roulant ou de grue sur portique (6a-c) peut être déplacé dans un sens longitudinal de la plateforme, l'agencement de grue étant conçu pour coopérer avec l'agencement de tamisage, l'agencement de lavage et l'agencement de traitement de rejet.
PCT/SE2023/051069 2022-11-02 2023-10-27 Usine de pâte Ceased WO2024096784A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2230352-3 2022-11-02
SE2230352A SE2230352A1 (en) 2022-11-02 2022-11-02 Pulp mill

Publications (1)

Publication Number Publication Date
WO2024096784A1 true WO2024096784A1 (fr) 2024-05-10

Family

ID=88697732

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2023/051069 Ceased WO2024096784A1 (fr) 2022-11-02 2023-10-27 Usine de pâte

Country Status (2)

Country Link
SE (1) SE2230352A1 (fr)
WO (1) WO2024096784A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991019066A1 (fr) * 1990-06-07 1991-12-12 A. Ahlstrom Corporation Installation integree pour le traitement de la pate de cellulose et methode de construction de ladite installation
WO2008153565A1 (fr) * 2007-06-12 2008-12-18 Meadwestvaco Corporation Mélange de fibres présentant un rendement élevé et des performances de pâte améliorées, et son procédé de fabrication
WO2011102760A1 (fr) * 2010-02-17 2011-08-25 Metso Paper Sweden Ab Procédé et système de recyclage de rebuts au cours d'un processus de cuisson d'une pâte chimique
WO2022050883A1 (fr) * 2020-09-03 2022-03-10 Valmet Ab Système de production de pâte de cellulose et procédé de commande d'un tel système

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645406A (en) * 1968-10-24 1972-02-29 Southern Iron And Equipment Co Gantry cranes
SE8201750L (sv) * 1981-03-30 1982-10-01 Svenska Flaektfabriken Ab Anleggning for massabehandling
CN210287951U (zh) * 2019-08-07 2020-04-10 杭州海鑫纸业有限公司 一种低脉冲网前筛

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991019066A1 (fr) * 1990-06-07 1991-12-12 A. Ahlstrom Corporation Installation integree pour le traitement de la pate de cellulose et methode de construction de ladite installation
WO2008153565A1 (fr) * 2007-06-12 2008-12-18 Meadwestvaco Corporation Mélange de fibres présentant un rendement élevé et des performances de pâte améliorées, et son procédé de fabrication
WO2011102760A1 (fr) * 2010-02-17 2011-08-25 Metso Paper Sweden Ab Procédé et système de recyclage de rebuts au cours d'un processus de cuisson d'une pâte chimique
WO2022050883A1 (fr) * 2020-09-03 2022-03-10 Valmet Ab Système de production de pâte de cellulose et procédé de commande d'un tel système

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REID ET AL: "Canadian forest industry complex market pulp/kraft sack paper", PULP AND PAPER INTERNATIONAL, MILLER FREEMAN PUBLICATIONS, SAN FRANCISCO, CA, US, vol. 14, 1 October 1972 (1972-10-01), pages 50 - 53, XP009549666, ISSN: 0033-409X *

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