WO2009123546A1 - Dispositif et procédé pour dilution de pâte de cellulose - Google Patents

Dispositif et procédé pour dilution de pâte de cellulose Download PDF

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Publication number
WO2009123546A1
WO2009123546A1 PCT/SE2009/050294 SE2009050294W WO2009123546A1 WO 2009123546 A1 WO2009123546 A1 WO 2009123546A1 SE 2009050294 W SE2009050294 W SE 2009050294W WO 2009123546 A1 WO2009123546 A1 WO 2009123546A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
chute
dilution
dilution liquid
nozzles
Prior art date
Application number
PCT/SE2009/050294
Other languages
English (en)
Inventor
Magnus Danielsson
Johan Bylander
Mårten DAHL
Original Assignee
Metso Paper, Inc.
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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to CN2009801124649A priority Critical patent/CN101981250A/zh
Priority to BRPI0909263-3A priority patent/BRPI0909263A2/pt
Priority to EP09726606.8A priority patent/EP2262946B1/fr
Priority to US12/920,112 priority patent/US20110005696A1/en
Priority to CA2716495A priority patent/CA2716495A1/fr
Publication of WO2009123546A1 publication Critical patent/WO2009123546A1/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
    • 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
    • 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
    • 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
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp

Definitions

  • the present invention relates to an improved device for dilution of cellulose pulp in the form of floes and to a related method,
  • the dilution is intended to be performed in order to dilute HC-celMose pulp of an original consistency of about 20 to 45% (HC -High Consistency), the dilution being withheld until the formation of a MC -pulp, i.e. until the pulp reaches a consistency in the range of 6-18% (MC -Medium consistency).
  • a ring shaped supply chamber for the addition of dilution liquid has been used in the business for a long time and has for instance been utilized for the dilution of cellulose pulp after HC- Ozon reactors, i.e. bleaching reactors in which cellulose pulp of high consistency, i.e. above approximately 20%. is bleached with Ozon.
  • a HC-Ozon reactor is conventionally a horizontal reactor with an interior transport and mixing screw, which normally is arranged directly after a shredding screw from a wash press, and in which the pulp falls down into a pulp chute after having been treated in the HC-Ozon reactor.
  • the fundamentals of a horizontal Ozon reactor is disclosed, in which the HC-pulp falls freely down into a dilution tank after the reactor.
  • the present invention relates to an improvement of the dilution with respect to a ring shaped supply chamber.
  • An object of the invention is to overcome the problems of the prior art and to evenly distribute the dilution such that substantially the whole pulp volume will have the same consistency. This is achieved by means of a device according to claim 1.
  • the invention relates to a device for dilution of cellulose pulp of a consistency of between 20 and 45%, which device comprises a pulp chute through which cellulose pulp is arranged to fall down under the addition of dilution liquid, wherein the dilution is performed to a consistency in the range of 6-18%, and wherein the addition of dilution liquid is performed on the falling pulp above a level of established diluted pulp in the bottom of the pulp chute.
  • a central distribution device with a nozzle arranged in the centre of the pulp chute for the addition of dilution liquid to the falling pulp in the centre of the memep chute and above the level of established diluted pulp in the bottom of the pulp chute, wherein the nozzle is fed with dilution liquid via a pipe that is arranged at least partly through the pulp chute.
  • the invention relates to a method of dilution of cellulose pulp with a consistency of between 20 and 45%, where dilution liquid is added to the cellulose pulp in a pulp chute, which dilution is performed to a consistency in the range of 6-18% as the cellulose pulp is in free fall above an established level of diluted cellulose pulp at the bottom of the pulp chute.
  • the dilution liquid is added in the centre of the pulp chute.
  • floes of pulp are wetted throughout essentially the whole cross section of the pulp chute before the floes hit the established pulp level in the chute.
  • the degree of wetting decreases with increasing distance from the walls of the pulp chute and is close to zero in the centre of the pulp chute.
  • an even dilution which is especially important with increasing capacity of the plants, and with the invention it is possible to reach a capacity of 4-5000 ADT pulp per day and plant.
  • Another advantage is that it is possible to divide the dilution liquids such that a less aggressive dilution liquid may be added in the periphery as a complement to treat the walls of the pulp chute leniently, wherein a less costly material may be used for these, while more aggressive pH adjusting chemicals, such as acids or bleaching chemicals, are added in the centre of the chute and surrounded by a protecting curtain of less aggressive cellulose pulp, closer to the inner walls of the chute.
  • Fig, 1 schematically shows a comprehensive view of an embodiment of a dilution device according (o the invention
  • Fig. 2 shows a view from below of an embodiment of the invention
  • Fie. 3 shows a cross sectional side view of an embodiment of the invention.
  • Figure 1 shows a position in the pulp line where decomposed cellulose pulp in the form of floes is transported in a screw feeder 1 in which a feed screw 2 feeds floes of cellulose pulp to a pulp chute 3.
  • the screw feeder 1 may constitute the final part of a pulp shredder or transport screw in a bleaching reactor in which the cellulose pulp is bleached at a high consistency, above at least 20%.
  • a dilution device 10 which adds dilution liquid to the flow of floes that falls freely down towards an established level of pulp 6 in the pulp chute 3.
  • the dilution device 10 comprises a line 15 that is drawn to a central distribution device with nozzles 1 1 arranged in the centre of the pulp chute 3 in order to distribute dilution liquid to the cellulose pulp, as it falls freely in the centre of the pulp chute.
  • a supply chamber 16 which is arranged for adding dilution liquid concentrically around the pulp chute, and which is provided with a plurality of nozzles 14 on the inner wall 3 A of the chute 3 (see fig. 2) for distributing dilution liquid to the floes that falls freely.
  • the diluted pulp which by the addition of dilution liquid has obtained a relatively homogenous concentration, forms an established level 6 of diluted pulp in the bottom of the chute 3.
  • a MC-pump 4 is arranged, which in a conventional manner is provided with a fluidizer 5 in front of the pump wheel of the pump.
  • the tluidizer 5 is at least partly arranged inside the chute 3 and provides a hefty agitation of the cellulose pulp in the bottom of the pulp chute, which is indicated with rotational arrows, and accomplishes the homogenisation of the concentration of the cellulose pulp.
  • the fluidizer is integrated with the pump wheel of the pump, but it may also be separated from the pump wheel and be provided with an own driving means, and placed in immediate connection of the inlet to the pump wheel.
  • FIG. 1 an embodiment of the dilution device 10 is shown in a view from below.
  • Dilution liquid is added via the line 12, wherein the dilution liquid reaches a certain pressure inside a supply chamber 16 defined by an outer wall 1OA and the inner wail 3 A the pulp chute 3.
  • a number of outlets 14 are arranged in the periphery of the pulp chute from the supply chamber 16 and directed inwards, towards the centre of the pulp chute.
  • the pressure in the supply chamber 16 is such that the dilution liquid is sprayed into the pulp chute towards the falling pulp.
  • the pressure control, the shape of the outlet and the quantity of outlets may vary in a number of different ways, which are evident to the skilled person. The object is however to yield maximal penetration into the flow of falling pulp floes.
  • the central distribution device comprises at least one pipe 15 extending from the wall 3A of the pulp chute 3 inwards, towards the centre of the pulp chute.
  • at least one nozzle 1 1 is arranged, for the addition of at least a part of the dilution liquid.
  • the nozzles 1 1 may have several outlets and may distribute the dilution liquid in form of a downwardly directed shower stream 11 A with a substantially conica! jet (see figure 3).
  • the dilution liquid may also be added in a direction obliquely upwards or completely horizontally outwards towards the w r alls 3A in the pulp chute.
  • An advantage of adding the dilution liquid obliquely upwards is that it thus is given more time for mixing with the falling pulp, whereby it of course mixes better.
  • Another advantage is that the energy of impact from the dilution liquid hitting the pulp contributes in mixing the pulp, which leads to that the pulp mixing gets a more homogenous consistency.
  • FIG. 1 An alternative or complement to such a distribution of the nozzles 11 in the centre of the pulp chute 3 is to, as in the shown embodiment, also arrange peripheral outlets 14.
  • the nozzle 11 of the central distribution device is arranged below the peripheral outlets 14 of the supply chamber 16 in the wall 3A of the pulp chute.
  • the addition of dilution liquid is directed towards the upper side of the pipe 11 of the central distribution device, partly in order to keep this free from floes that otherwise easily may gather thereon. Therefore, as is shown in figure 3, one of the jets 14B from the peripheral outlets 14 may directed in parallel with the upper side of the pipe 11.
  • the pipe may also be drawn into the pulp chute in the way that is shown in figure 3, i.e.
  • the pipe 15 also may be drawn in several other fashions. It is of course important that the pipe does not hinder the falling the pulp too much, a certain contact may however be positive since it may function as an agitation of the pulp, which may contribute to better mixing and homogcnisation of it.
  • the feeding pipe 15 is provided with a separate feeding, wherein the outlets or nozzles 1 1 of the central distribution devices may be fed with a different dilution liquid from another source than the one that is being fed to the peripheral nozzles 14,
  • a pH-regulating agent, bleaching chemicals or other additives centrally in the pulp chute, whereby the falling fiocs of pulp that has been totally or partly diluted with a less aggressive dilution liquid shields off the centrally added dilution liquid such that it does not reach the inner wall 3 A of the pulp chute.
  • the design of the supply chamber 16 and the upper parts of the pulp chute 3 may hence be designed in a simpler and cheaper material, where only the pipe 15 and nozzle 1 1 of the central distribution device requires materials that are resistant to a concentrated dilution liquid.
  • the pulp chute may therefore be designed with a deaeration canal 13 that is connected to the pulp chute abo ⁇ e the supply chamber 10.
  • the deaerated gases may either be released to the surrounding atmosphere or to a decomposition system depending on whether the gases are environmental harmful or not.

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

Abstract

L'invention porte sur un dispositif (1) et sur un procédé pour la dilution de pâte de cellulose ayant une consistance se situant entre 20 et 45 %, dans lesquels de la pâte de cellulose est disposée de façon à tomber dans une goulotte de pâte (30) lors de l'addition d'un liquide de dilution, cette dilution étant effectuée jusqu'à une consistance dans la plage de 6 à 18 %, au-dessus d'un niveau (6) de pâte diluée établie en bas de la goulotte de pâte (3). Un dispositif de distribution central avec des buses (11) pour l'addition de liquide de dilution à la pâte tombée au-dessus du niveau (6) de pâte diluée établie en bas de la goulotte de pâte est disposé au centre de la goulotte de pâte, les buses (11) du dispositif de distribution étant alimentées en liquide de dilution par l'intermédiaire d'un tuyau (15) qui est disposé au moins partiellement à travers la goulotte de pâte (3).
PCT/SE2009/050294 2008-03-31 2009-03-20 Dispositif et procédé pour dilution de pâte de cellulose WO2009123546A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN2009801124649A CN101981250A (zh) 2008-03-31 2009-03-20 用于稀释纤维素纸浆的装置和方法
BRPI0909263-3A BRPI0909263A2 (pt) 2008-03-31 2009-03-20 Dispositivo e método para diluição de polpa de celulose
EP09726606.8A EP2262946B1 (fr) 2008-03-31 2009-03-20 Dispositif et procédé pour dilution de pâte de cellulose
US12/920,112 US20110005696A1 (en) 2008-03-31 2009-03-20 Device and method for dilution of cellulose pulp
CA2716495A CA2716495A1 (fr) 2008-03-31 2009-03-20 Dispositif et procede pour dilution de pate de cellulose

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800718-9 2008-03-31
SE0800718A SE0800718L (sv) 2008-03-31 2008-03-31 Anordning samt förfarande för spädning av cellulosamassa

Publications (1)

Publication Number Publication Date
WO2009123546A1 true WO2009123546A1 (fr) 2009-10-08

Family

ID=40084544

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2009/050294 WO2009123546A1 (fr) 2008-03-31 2009-03-20 Dispositif et procédé pour dilution de pâte de cellulose

Country Status (7)

Country Link
US (1) US20110005696A1 (fr)
EP (1) EP2262946B1 (fr)
CN (1) CN101981250A (fr)
BR (1) BRPI0909263A2 (fr)
CA (1) CA2716495A1 (fr)
SE (1) SE0800718L (fr)
WO (1) WO2009123546A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110005696A1 (en) * 2008-03-31 2011-01-13 Magnus Danielsson Device and method for dilution of cellulose pulp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2650066C2 (ru) 2013-01-04 2018-04-06 Зульцер Мэнэджмент Аг Способ и устройство для переноса технологической жидкости, промышленное предприятие и способ упрощения его схемы
CN107981407B (zh) * 2018-01-19 2020-04-17 河南卷烟工业烟草薄片有限公司 一种无动力造纸法再造烟叶生产过程混料装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584743A1 (fr) * 2004-04-07 2005-10-12 Kvaerner Pulping AB Procédé et dispositif pour la manutention de pâte cellulosique
WO2007117202A1 (fr) * 2006-04-10 2007-10-18 Metso Paper Inc. procédé et dispositif pour distribuer la pâte depuis une unité d'épaississement

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US2614923A (en) * 1946-04-17 1952-10-21 Sunila Osakeyhtio Digester filling in sulfate pulping
US3445328A (en) * 1964-01-25 1969-05-20 Kamyr Ab Method for continuous cellulose digestion utilizing two temperature zones
US3427218A (en) * 1964-07-10 1969-02-11 Kamyr Ab Method of performing counter-current continuous cellulose digestion
SE431662B (sv) * 1974-07-05 1984-02-20 Kamyr Ab Sett vid kontinuerlig kokning av fibermaterial
CA1056636A (fr) * 1975-04-07 1979-06-19 Jerry Zucker Digesteur et methode d'utilisation
US4568419A (en) * 1984-02-27 1986-02-04 Laakso Oliver A Method of treating comminuted cellulosic fibrous material in a vertical vessel
FI80303C (fi) * 1986-11-28 1991-04-10 Ahlstroem Oy Tjockmassatorn.
SE502064C2 (sv) * 1993-11-29 1995-07-31 Kvaerner Pulping Tech Sätt och anordning för utmatning av fibermassa
FI98836C (fi) * 1994-06-09 1997-08-25 Ahlstroem Pumput Oy Korkeasakeusmassatorni
SE0800718L (sv) * 2008-03-31 2008-12-09 Metso Paper Inc Anordning samt förfarande för spädning av cellulosamassa
BR112012003861B1 (pt) * 2009-08-19 2019-07-02 Valmet Aktiebolag Método e disposição para adicionar um licor de tratamento quente e vapor a um material celulósico triturado não vaporizado

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1584743A1 (fr) * 2004-04-07 2005-10-12 Kvaerner Pulping AB Procédé et dispositif pour la manutention de pâte cellulosique
WO2007117202A1 (fr) * 2006-04-10 2007-10-18 Metso Paper Inc. procédé et dispositif pour distribuer la pâte depuis une unité d'épaississement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2262946A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110005696A1 (en) * 2008-03-31 2011-01-13 Magnus Danielsson Device and method for dilution of cellulose pulp

Also Published As

Publication number Publication date
EP2262946B1 (fr) 2013-11-20
EP2262946A1 (fr) 2010-12-22
EP2262946A4 (fr) 2013-03-27
SE531079C2 (sv) 2008-12-09
CN101981250A (zh) 2011-02-23
SE0800718L (sv) 2008-12-09
BRPI0909263A2 (pt) 2015-08-18
CA2716495A1 (fr) 2009-10-08
US20110005696A1 (en) 2011-01-13

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