WO2015155642A1 - Procédé de lessivage de matériau fibreux de cellulose dans un lessiveur en continu - Google Patents

Procédé de lessivage de matériau fibreux de cellulose dans un lessiveur en continu Download PDF

Info

Publication number
WO2015155642A1
WO2015155642A1 PCT/IB2015/052419 IB2015052419W WO2015155642A1 WO 2015155642 A1 WO2015155642 A1 WO 2015155642A1 IB 2015052419 W IB2015052419 W IB 2015052419W WO 2015155642 A1 WO2015155642 A1 WO 2015155642A1
Authority
WO
WIPO (PCT)
Prior art keywords
digester
screen section
liquor
washing
cooking
Prior art date
Application number
PCT/IB2015/052419
Other languages
English (en)
Inventor
Mats NÄSMAN
Joni LAPATTO
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Priority to CN201580018554.7A priority Critical patent/CN106164370B/zh
Priority to US15/302,212 priority patent/US20170022664A1/en
Priority to EP15776194.1A priority patent/EP3129546A4/fr
Priority to BR112016023526A priority patent/BR112016023526A2/pt
Publication of WO2015155642A1 publication Critical patent/WO2015155642A1/fr

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
    • 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

Definitions

  • the invention relates to an improved method to digest cellulose fibrous material in a continuous digester to produce pulp.
  • the production of chemical pulp of cellulosic fibers is normally performed by cooking wood material, such as chips, in cooking liquor (or white liquor) comprising chemicals that loosen the fibers from the lignin.
  • cooking wood material such as chips
  • cooking liquor or white liquor
  • the most common cooking process of today is the kraft process (also known as sulphate cooking), wherein the active chemicals in the cooking liquor are sodium hydroxide and sodium sulphide.
  • the cooking takes place in a pressurized vessel, usually designed as a large vertical cylinder, called the digester.
  • wood chips and cooking liquor are fed into the top of the digester in a continuous stream while cooked pulp is blown out from the bottom of the digester.
  • the chips/pulp continuously moves downwards in the digester.
  • the cooking is interrupted by the introduction of cooler washing liquid as the pulp is being washed.
  • continuous cooking is combined with counter- current washing of the cooked pulp in the same vessel.
  • the upper part of the cooking vessel forms a cooking zone, where the pulp and the liquor move from the top downwards.
  • the lower part of the cooking vessel forms a washing zone, where the pulp moves further downwards and cooking liquor is displaced with wash liquor and thus moves upwards, counter current up through the chip column.
  • the residual liquors (spent cooking liquor and wash liquor) are drawn off through a screen at the end of the cooking zone and further treated in the evaporator plant.
  • EP1764441 describes process of continuous cooking of pulp, which process is said to increase the washing efficiency at the bottom of a continuous digester. To solve this problem, an extra screen section is arranged above the lowermost screen section and a number of addition positions for washing liquid are distributed around the
  • One object of the present invention is thus to maintain or increase the washing efficiency in a continuous pulp digester when increasing the production volume.
  • the invention discloses a method of continuous cooking cellulose fibrous material in a digester, said digester having a top and a bottom.
  • the method of the invention comprises the steps of:
  • a third washing liquor is added to the center of digester at the level of an additional, second extraction screen section arranged in the lower part of the digester.
  • the delignification reaction takes place in as big volume as possible in the digester.
  • the method further makes it possible to increase the production rate in the digester but still maintain or even increase the washing efficiency.
  • the addition of said third, washing liquor to the center of the digester ensures a high displacement efficiency, which further enhances the washing efficiency.
  • the expression that the washing liquor is fed "into the center" of the digester means that the washing liquor is fed into the flow of pulp/liquors from a point or from several points located inside the digester.
  • the washing liquor is not added in positions distributed around the circumference of the digester.
  • the washing liquor is fed or added in the middle, or substantially in the middle, of the vertical flow of pulp/liquors.
  • the expression "at the level of the extraction screen section” means a level within the area defined by the extraction screen section and 1 meter above the top edge of said screen section.
  • screen section includes one screen row or several screen rows arranged sequentially onto each other in the digester in the direction of the main flow of the cellulose fibrous material slurry.
  • top of the digester is meant to include the top portion of the digester and the “bottom of the digester” is meant to include the bottom portion of the digester.
  • lower part of the digester means the part of the digester where washing of the pulp takes place.
  • the invention further relates to a continuous digester, having a top and a bottom, for the production of chemical pulp by cooking wood chips in cooking liquor, which digester comprises;
  • Said “means” for feeding said first, second and third washing liquor may be, e.g. an inlet pipe or a similar arrangement.
  • Fig. 1 shows a schematic view of a digester in accordance with the invention.
  • the continuous digester shown in fig. 1 is in the form of a pressurized, essentially cylindrical, vessel (1 ) comprising a top and a bottom.
  • Cellulose fibrous material e.g. wood chips
  • cooking liquor are continuously fed into the digester through an inlet (2).
  • the chips form a porous chip column descending downwardly in the digester.
  • the cooking liquor may e.g. be kraft cookling liquor comprising sodium hydroxide and sodium sulphide.
  • Cooked pulp is continuously removed or blown from the bottom of the digester through an outlet (3).
  • central pipes (5a, 5c) are arranged, through which pipes separate liquor entry flows may be conveyed to different levels of the vessel.
  • Said central pipes (5) may comprise an upper pipe (5a) and a lower pipe (5c) as shown in fig. 1.
  • these pipes may be arranged in several different modes, e.g. a first pipe having an outlet in a first level may be concentrically arranged in a second pipe, having an outlet in a second level above said first level.
  • One or several extraction screen structures (4) may be arranged in the vessel wall of the upper or middle part of the vessel, from which screen structures cooking liquor may be removed (4a) from the digester to be reprocessed at another location.
  • a first and a second extraction screen section (6 and 7) are arranged in the lower part of the digester, which first extraction screen section (6) is arranged in the lower part of the digester and said second screen section (7) is arranged below, but at a relatively small distance, from the first extraction screen section (6).
  • the vertical distance between the lowermost part of the first extraction screen section (6) and the uppermost part of the second extraction screen section (7) may be, e.g., 0, 1 - 15 m, preferably between 0,5 - 5 m.
  • the first extraction screen section (6) may be arranged above said second screen section at a distance corresponding to a retention time of between 0 - 30 minutes, preferably of between 0, 1 - 20 minutes and even more preferably of between 5 - 15 minutes.
  • a first washing liquor (8a, 8b) is pumped into the bottom part of the vessel (1 ).
  • Said first washing liquor may be added through a single inlet or through several inlets arranged in the bottom part of the vessel.
  • the upwards-flowing washing liquid displaces the cooking liquor towards the extraction screens (6 and 7).
  • a second washing liquor (9) is fed into the center of the digester, and into the middle of the descending chip column, through the upper pipe (5a) having an outlet (5b) at the level of the first extraction screen section (6).
  • a third washing liquor (10) is fed into the center of the digester, and into the middle of the descending chip column, through the lower central pipe (5c) having an outlet (5d) at the level of the second extraction screen section (7).
  • the first, second and third washing liquors may originate from one, single, liquor fed from an earlier washing stage (13).
  • Cooking liquor and washing liquor (1 1 , 12) are withdrawn from said first extraction screen section (6) and from said second extraction screen section (7) and further treated in a flash and evaporation plant (not shown). Part of the liquor (12a) may be circulated back to the digester in order to enhance the distribution and mixing in the digester.
  • the flow (m3/ADT), or volume per produced ton of pulp, of added washing liquor at the level of each extraction screen section is equal or less than the flow of liquors withdrawn from said extraction screen section.
  • the flow of the added second washing liquor (9) is equal to or less than the flow of the liquors (1 1 ) withdrawn from the first extraction screen section (6).
  • the flow of the added third washing liquor (10) is equal to or less than the flow of the liquors (12) withdrawn from the second extraction screen section (7).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Cette invention concerne un procédé de cuisson continue d'un matériau fibreux de cellulose dans un lessiveur, ledit lessiveur présentant une partie supérieure et une partie inférieure. Le procédé selon l'invention comprend les étapes consistant à : acheminer une pâte liquide comprenant un matériau fibreux cellulosique et une liqueur de cuisson dans la partie supérieure du lessiveur ; acheminer une première liqueur de lavage vers la partie inférieure du lessiveur, ladite première liqueur de lavage se déplaçant à contre-courant à travers au moins une partie du lessiveur ; extraire la pâte du fond du lessiveur ; acheminer une deuxième liqueur de lavage vers le centre du lessiveur au moins au niveau d'une première section de tamisage ; acheminer une troisième liqueur de lavage vers le centre du lessiveur au niveau d'une seconde section de tamisage ; et extraire la liqueur de cuisson et les liqueurs de lavage de la première section de tamisage et de la deuxième section de tamisage, ladite première section de tamisage étant disposée dans une partie inférieure du lessiveur et ladite seconde section de tamisage étant disposée en dessous de ladite première section de tamisage. Ainsi, selon l'invention, une troisième liqueur de lavage est ajoutée au centre de lessiveur au niveau d'une seconde section de tamisage d'extraction supplémentaire agencée dans la partie inférieure du digesteur. Le procédé selon l'invention permet d'augmenter le taux de production dans le lessiveur tout en maintenant ou même en augmentant l'efficacité du lessivage.
PCT/IB2015/052419 2014-04-07 2015-04-02 Procédé de lessivage de matériau fibreux de cellulose dans un lessiveur en continu WO2015155642A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201580018554.7A CN106164370B (zh) 2014-04-07 2015-04-02 在连续蒸煮器中蒸煮纤维素纤维材料的方法
US15/302,212 US20170022664A1 (en) 2014-04-07 2015-04-02 Method of digesting cellulose fibrous material in a continuous digester
EP15776194.1A EP3129546A4 (fr) 2014-04-07 2015-04-02 Procédé de lessivage de matériau fibreux de cellulose dans un lessiveur en continu
BR112016023526A BR112016023526A2 (pt) 2014-04-07 2015-04-02 método de digestão de material fibroso de celulose em um digestor de processamento contínuo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201461976053P 2014-04-07 2014-04-07
US61/976,053 2014-04-07

Publications (1)

Publication Number Publication Date
WO2015155642A1 true WO2015155642A1 (fr) 2015-10-15

Family

ID=54287367

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/052419 WO2015155642A1 (fr) 2014-04-07 2015-04-02 Procédé de lessivage de matériau fibreux de cellulose dans un lessiveur en continu

Country Status (5)

Country Link
US (1) US20170022664A1 (fr)
EP (1) EP3129546A4 (fr)
CN (1) CN106164370B (fr)
BR (1) BR112016023526A2 (fr)
WO (1) WO2015155642A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298899A (en) * 1962-03-03 1967-01-17 Kamyr Ab Method and arrangement for washing and cooling at the outlet end of a continuous cellulose digester
CA927164A (en) * 1970-02-11 1973-05-29 S. Eriksson Erik Device for washing of cellulose
WO1994011566A1 (fr) * 1992-11-18 1994-05-26 Kamyr Aktiebolag Procede de cuisson en continu de pate cellulosique
US6123808A (en) * 1997-12-09 2000-09-26 Ahlstrom Machinery Inc. Distribution of dilution liquor to the discharge of a cellulose pulp digester
WO2005116327A1 (fr) * 2004-05-28 2005-12-08 Metso Paper, Inc. Tamis central
EP1764441A1 (fr) * 2005-09-15 2007-03-21 Kvaerner Pulping AB Lessiveur en continu avec circulation de fluid
WO2010110724A1 (fr) * 2009-03-26 2010-09-30 Metso Fiber Karlstad Ab Procédé et agencement de lavage après cuisson complète dans un lessiveur en continu pour la production de pulpe de cellulose
WO2012102650A1 (fr) * 2011-01-25 2012-08-02 Metso Paper Sweden Ab Digesteur en continu à racloir inférieur équipé d'ouvertures de drainage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1262116B (de) * 1958-07-09 1968-02-29 Kamyr Ab Verfahren und Vorrichtung zum Vorwaschen des Zellstoffbreis in einem stehenden Zellstoffkocher
US6241851B1 (en) * 1998-03-03 2001-06-05 Andritz-Ahlstrom Inc. Treatment of cellulose material with additives while producing cellulose pulp
US9260818B2 (en) * 2007-05-23 2016-02-16 Andritz Inc. Single vessel reactor system for hydrolysis and digestion of wood chips with chemical enhanced wash method
US8734610B2 (en) * 2007-05-23 2014-05-27 Andritz Inc. Two vessel reactor system and method for hydrolysis and digestion of wood chips with chemical enhanced wash method
WO2011066189A1 (fr) * 2009-11-24 2011-06-03 Andritz Inc. Procédé et système pour la cuisson de copeaux minces dans un lessiveur
US9371612B2 (en) * 2011-02-22 2016-06-21 Andritz Inc. Method and apparatus to produce pulp using pre-hydrolysis and Kraft cooking

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3298899A (en) * 1962-03-03 1967-01-17 Kamyr Ab Method and arrangement for washing and cooling at the outlet end of a continuous cellulose digester
CA927164A (en) * 1970-02-11 1973-05-29 S. Eriksson Erik Device for washing of cellulose
WO1994011566A1 (fr) * 1992-11-18 1994-05-26 Kamyr Aktiebolag Procede de cuisson en continu de pate cellulosique
US6123808A (en) * 1997-12-09 2000-09-26 Ahlstrom Machinery Inc. Distribution of dilution liquor to the discharge of a cellulose pulp digester
WO2005116327A1 (fr) * 2004-05-28 2005-12-08 Metso Paper, Inc. Tamis central
EP1764441A1 (fr) * 2005-09-15 2007-03-21 Kvaerner Pulping AB Lessiveur en continu avec circulation de fluid
WO2010110724A1 (fr) * 2009-03-26 2010-09-30 Metso Fiber Karlstad Ab Procédé et agencement de lavage après cuisson complète dans un lessiveur en continu pour la production de pulpe de cellulose
WO2012102650A1 (fr) * 2011-01-25 2012-08-02 Metso Paper Sweden Ab Digesteur en continu à racloir inférieur équipé d'ouvertures de drainage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3129546A4 *

Also Published As

Publication number Publication date
BR112016023526A2 (pt) 2017-08-15
CN106164370B (zh) 2019-01-18
EP3129546A1 (fr) 2017-02-15
US20170022664A1 (en) 2017-01-26
CN106164370A (zh) 2016-11-23
EP3129546A4 (fr) 2017-11-15

Similar Documents

Publication Publication Date Title
CN1047640C (zh) 通过蒸煮粉碎的纤维素纤维生产硫酸盐纸浆的方法
EP0673453B1 (fr) Procede de cuisson en continu de pate cellulosique
CN103003487B (zh) 高α溶解浆生产的方法和系统
JP4317691B2 (ja) 連続蒸解器を作動するプロセス及び蒸煮液用の再循環システム
CN1981085A (zh) 降低浸煮器系统中结垢的方法
JP5049980B2 (ja) 連続蒸煮方法及び装置
CN111819323B (zh) 生产溶解浆料的方法
EP0937813A2 (fr) Amélioration de la réduction du bois en pâte avec contrÔle des solides dissouds
US5885414A (en) Method of producing pulp with high alkali cooking in the last cooking stage
US6203662B1 (en) Method for the continuous cooking of pulp in a digester system having a top separator
CN102639785B (zh) 使用下流式容器的连续工艺中向纤维素原料添加处理液的方法和装置
US8197639B2 (en) Vapour phase digester and a method for continuous cooking
US20170022664A1 (en) Method of digesting cellulose fibrous material in a continuous digester
US6103058A (en) Method for the continuous cooking of pulp
JP2002155484A (ja) パルプの連続蒸煮プロセス
US6159336A (en) Method and device for the continuous cooking of pulp
US6113742A (en) Digester having screening arrangement for isothermal cooking of fibrous material
US20050115691A1 (en) Cooking of cellulose pulp in a cooking liquor containing preevaporated black liquor
Råmark et al. Andritz’s new technology applied to dissolving pulp grades–a different approach
US20040089430A1 (en) Method for alkaline cooking of fiber material
JP2004300603A (ja) コンベンショナル連続蒸解釜によるパルプ連続製造方法
WO2017171608A1 (fr) Agencement d'alimentation de classeur
Râmark MANUFACTURING OF DISSOLVING PULP WITH CONTINUOUS COOKING AND NOVEL FIBERLINE TECHNOLOGY-LABORATORY RESULTS AND A COMPARISON TO MILL RESULTS
JPH04240282A (ja) 亜硫酸パルプ化によるセルロースパルプ製造方法及び装置
SE521678C2 (sv) Kontinuerlig sulfatkokning med behandling av flis med avdragen avlut

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15776194

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 15302212

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112016023526

Country of ref document: BR

REEP Request for entry into the european phase

Ref document number: 2015776194

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2015776194

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 112016023526

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20161007