EP2262946A1 - Device and method for dilution of cellulose pulp - Google Patents

Device and method for dilution of cellulose pulp

Info

Publication number
EP2262946A1
EP2262946A1 EP09726606A EP09726606A EP2262946A1 EP 2262946 A1 EP2262946 A1 EP 2262946A1 EP 09726606 A EP09726606 A EP 09726606A EP 09726606 A EP09726606 A EP 09726606A EP 2262946 A1 EP2262946 A1 EP 2262946A1
Authority
EP
European Patent Office
Prior art keywords
pulp
chute
dilution
dilution liquid
nozzles
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.)
Granted
Application number
EP09726606A
Other languages
German (de)
French (fr)
Other versions
EP2262946A4 (en
EP2262946B1 (en
Inventor
Magnus Danielsson
Johan Bylander
Mårten DAHL
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
Metso Paper 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 Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP2262946A1 publication Critical patent/EP2262946A1/en
Publication of EP2262946A4 publication Critical patent/EP2262946A4/en
Application granted granted Critical
Publication of EP2262946B1 publication Critical patent/EP2262946B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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.

Landscapes

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

Abstract

The invention relates to a device (1 ) and a method for dilution of cellulose pulp of a consistency of between 20 and 45%, in which cellulose pulp is arranged to fall down in a pulp chute (3) under the addition of dilution liquid, which dilution is performed to a consistency in the range of 6-18%, above a level (6) of established diluted pulp in the bottom of the pulp chute (3), A central distribution device with nozzles (11) for addition of dilution liquid to the falling pulp above the level (6) of established diluted pulp in the bottom of the pulp chute is arranged in the centre of the pulp chute, wherein the nozzles (11) of the distribution device is fed with dilution liquid via a pipe (15) that is arranged at least partly through the pulp chute (3).

Description

Device and method for dilution of cellulose pulp
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).
Background
In connection to the dilution of decomposed cellulose pulp of a high dryness, typically a consistency of above 20%, it is normal procedure to add dilution liquid whilst agitating by means of a dilution screw. This has also been the starting point in the Swedish patent SE
526292, which represents the prior art. Within this prior art dilution to the desired consistency is achieved b> the addition of dilution liquid via a ring shaped supply chamber around a pulp chute.
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. In e.g. US 5 174 861, the fundamentals of a horizontal Ozon reactor is disclosed, in which the HC-pulp falls freely down into a dilution tank after the reactor.
it has been noticed that the use of a ring shaped supply chamber around a pulp chute that periferally injects dilution liquid towards the falling floes of pulp, only achieves a certain degree of penetration into the flow and that the maximum quantity of dilution liquid that may be added is limited,
In a plant with a capacity of 3000 ADT (Absolutely Dry Tons) of pulp a day, a pulp chute of a diameter in the range of 1,5 metre is utilized and conventionally no pulp chute for MC -pulp (Medium Consistency) with a diameter of less than 0,80 metres has been utilized. This means that a very good agitation of the pulp is required in order to achieve a satisfactory dilution by means of a ring shaped supply chamber.
Short description of the invention
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.
According to a first aspect, 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. Further, 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 puip 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.
According to a second aspect, 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.
In the device and the method according to the invention 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. Thus, not only the floes of pulp falling along the walls of the pulp chute will be wet, in which case 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. Instead, 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. With the invention it is possible to obtain a higher degree of homogen dilution of cellulose pulp in free fall, since more dilution liquid may be added, which furthermore may be more evenly distributed in the pulp. Also, it is possible to obtain a high degree of homogeiiously diluted cellulose pulp already in the free fall, i.e. without agitating the liquid. 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.
Short description of the drawings
Below, an embodiment of the invention will be described in detail with reference to the accompanying figures, of which:
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.
Detailed description 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%.
In the upper part of the pulp chute 3 a dilution device 10 is arranged, 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. Additionally, in the shown embodiment there is also 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. In connection to the bottom of the chute 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. Normally, 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.
I figure 2, 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.
As is apparent from the figures, 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 the end of this pipe 15. 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). However, the dilution liquid may also be added in a direction obliquely upwards or completely horizontally outwards towards the wralls 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. In order to further improve the distribution of dilution liquid to the falling cellulose pulp it is feasible to arrange several central nozzles 11, which are distributed over substantially the whole width of the pulp chute.
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. In figures 1 and 3, 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. In this way 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. obliquely downwards such that the floes falling from above towards the pipe shall fall of more easily. To a skilled person it is obvious that 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.
In one embodiment of the invention 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, Thus, it is possible to add 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.
Large quantities of dilution liquid are added to the flow of freely falling pulp floes and may¬ be followed by air or gas in the flow, wherein an active deaeration may be needed in order to vent redundant volumes accompanying the flow. 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.

Claims

Claims
1. Device (1) for dilution of cellulose pulp of a consistency of between 20 and 45%, which device comprises a pulp chute (3) 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 6-1 8%, and wherein the addition of dilution liquid is performed on the falling pulp above a level (6) of established diluted pulp in the bottom of the pulp chute (3). characterised in a central distribution device with a nozzle (U) arranged in the centre of the pulp chute (3) for the addition of dilution liquid to the falling pulp in the centre of the pulp chute (3) and above the level (6) of established diluted pulp in the bottom of the pulp chute, wherein the nozzle (1 1) is fed with dilution liquid via a pipe (15) that is arranged at least partly through the pulp chute.
2. Device according to claim 1 , characterised in that the central distribution device comprises several nozzles (11) that are evenly distributed over the width of the pulp chute.
3. Device according to claim 1 or 2 characterised in that a peripheral distribution device with perifepheral nozzles (14) is arranged for adding dilution liquid from the inner wall (3Λ) of the pulp chute.
4. Device according to claim 3, characterised in that the central distribution device is arranged under the nozzles (14) of the peripheral distribution device.
5. Device according to claim 3 or 4, characterised in that the feeding to the nozzles (11) of the central distribution device is separated from the feeding to the nozzles (14) of the peripheral distribution device, wherein dilution liquid from different sources may be fed to the different nozzles (1 1 and 14. respectiverv).
6. Device according to claim 5 characterised in that a deacration canal (13) is arranged in connection to the pulp chute (3) above the nozzles (1 1. 14).
7. Method for 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 fail above an established level of diluted cellulose pulp at the bottom of the pulp chute, characterised in that dilution liquid is added in the centre of the pulp chute,
8. Method according to claim 7, characterised in that the dilution liquid is added from several nozzles that are substantially evenly distributed over the width of the pulp chute.
9. Method according to claim 7 or 8, characterised in that dilution liquid also is added from the inner wall (3A) of the pulp chute.
10. Method according to claim 9, characterised in that different dilution liquids are added in the centre and the periphery of the pulp chute, wherein the dilution liquid added in the centre of the pulp chute preferably is more concentrated than the dilution liquid added in the periphery of the pulp chute.
11. Method according to any of the claims 7-10, characterised in that at least 25% of the dilution liquid is added in the centre of the pulp chute.
EP09726606.8A 2008-03-31 2009-03-20 Device and method for dilution of cellulose pulp Not-in-force EP2262946B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800718A SE531079C2 (en) 2008-03-31 2008-03-31 Device and method for diluting cellulose pulp
PCT/SE2009/050294 WO2009123546A1 (en) 2008-03-31 2009-03-20 Device and method for dilution of cellulose pulp

Publications (3)

Publication Number Publication Date
EP2262946A1 true EP2262946A1 (en) 2010-12-22
EP2262946A4 EP2262946A4 (en) 2013-03-27
EP2262946B1 EP2262946B1 (en) 2013-11-20

Family

ID=40084544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09726606.8A Not-in-force EP2262946B1 (en) 2008-03-31 2009-03-20 Device and method for dilution of cellulose pulp

Country Status (7)

Country Link
US (1) US20110005696A1 (en)
EP (1) EP2262946B1 (en)
CN (1) CN101981250A (en)
BR (1) BRPI0909263A2 (en)
CA (1) CA2716495A1 (en)
SE (1) SE531079C2 (en)
WO (1) WO2009123546A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531079C2 (en) * 2008-03-31 2008-12-09 Metso Paper Inc Device and method for diluting cellulose pulp
RU2650066C2 (en) * 2013-01-04 2018-04-06 Зульцер Мэнэджмент Аг Method and device for transferring process liquid, industrial facility and method of simplifying layout of such
CN107981407B (en) * 2018-01-19 2020-04-17 河南卷烟工业烟草薄片有限公司 Unpowered mixing device for reconstituted tobacco production process by papermaking method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269124A2 (en) * 1986-11-28 1988-06-01 A. Ahlstrom Corporation High-consistency pulp tower for discharging said pulp
US5688369A (en) * 1993-11-29 1997-11-18 Kvaerner Pulping Aktiebolag Method and device for feeding out fibre pulp
US5711600A (en) * 1994-06-09 1998-01-27 Ahlstrom Machinery Corporation High consistency pulp tower with a parting member and the introduction of dilution liquid

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2614923A (en) * 1946-04-17 1952-10-21 Sunila Osakeyhtio Digester filling in sulfate pulping
NO118474B (en) * 1964-01-25 1969-12-29 Kamyr Ab
US3427218A (en) * 1964-07-10 1969-02-11 Kamyr Ab Method of performing counter-current continuous cellulose digestion
SE431662B (en) * 1974-07-05 1984-02-20 Kamyr Ab KEEP ON CONTINUOUS COOKING OF FIBER MATERIAL
CA1056636A (en) * 1975-04-07 1979-06-19 Jerry Zucker Digester system and method
US4568419A (en) * 1984-02-27 1986-02-04 Laakso Oliver A Method of treating comminuted cellulosic fibrous material in a vertical vessel
SE0400940L (en) * 2004-04-07 2005-08-16 Kvaerner Pulping Tech Method and apparatus for diluting dewatered cellulose pulp
SE529848C2 (en) * 2006-04-10 2007-12-11 Metso Paper Inc Method and apparatus for feeding pulp from a dewatering unit
SE531079C2 (en) * 2008-03-31 2008-12-09 Metso Paper Inc Device and method for diluting cellulose pulp
US8801898B2 (en) * 2009-08-19 2014-08-12 Valmet Ab Method and arrangement for adding treatment liquors to cellulose raw material in a continuous process using down flow vessels

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0269124A2 (en) * 1986-11-28 1988-06-01 A. Ahlstrom Corporation High-consistency pulp tower for discharging said pulp
US5688369A (en) * 1993-11-29 1997-11-18 Kvaerner Pulping Aktiebolag Method and device for feeding out fibre pulp
US5711600A (en) * 1994-06-09 1998-01-27 Ahlstrom Machinery Corporation High consistency pulp tower with a parting member and the introduction of dilution liquid

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009123546A1 *

Also Published As

Publication number Publication date
US20110005696A1 (en) 2011-01-13
CA2716495A1 (en) 2009-10-08
SE0800718L (en) 2008-12-09
EP2262946A4 (en) 2013-03-27
SE531079C2 (en) 2008-12-09
CN101981250A (en) 2011-02-23
WO2009123546A1 (en) 2009-10-08
BRPI0909263A2 (en) 2015-08-18
EP2262946B1 (en) 2013-11-20

Similar Documents

Publication Publication Date Title
FI67413C (en) FOERFARANDE FOER BEHANDLING AV FINFOERDELAD FIBERHALTIG ELLER CELLULOSAHALTIG MASS SAMT ANORDNING FOER UTFOERANDE AV FOERFARANDET
US7887671B2 (en) Method for dilution of cellulose pulp
FI61733B (en) BEHANDLING MED GAS SPECIELLT SYRGAS
EP2616170B1 (en) Method and means for the preparation of solutions from dry chemicals
EP2262946B1 (en) Device and method for dilution of cellulose pulp
WO2008050826A1 (en) Aeration apparatus
EP0573892B1 (en) Reactor system for treating cellulosic pulp
JP2012528254A (en) A new method and arrangement for supplying chemicals into the pulp process stream.
US7455749B2 (en) Gas phase continuous digester having an inverted top separator with liquor injection
CN101421457B (en) A method and a device for feeding pulp from a dewatering unit
KR102366494B1 (en) System for producing wet-laid recycled non-woven fabric
EP0912796B1 (en) Method and apparatus for filling a pulp tower
CN101512067A (en) A method and apparatus for filling and cleaning a pulp tower.
US6051109A (en) Apparatus for distributing fluffed pulp into a static bed reactor
WO1996002699A1 (en) A method and an arrangement relating to bleaching with pressurized peroxide
US20080271860A1 (en) Method and apparatus to distribute the inflow of liquors in batch digester
SE522811C2 (en) Method and apparatus for treating, in particular bleaching, of fibrous material

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20101102

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA RS

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20130227

RIC1 Information provided on ipc code assigned before grant

Ipc: D21C 9/18 20060101ALI20130221BHEP

Ipc: D21C 9/06 20060101AFI20130221BHEP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602009020232

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: D21C0009060000

Ipc: D21C0009020000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: D21C 9/02 20060101AFI20130620BHEP

Ipc: D21C 9/06 20060101ALI20130620BHEP

Ipc: D21C 9/18 20060101ALI20130620BHEP

INTG Intention to grant announced

Effective date: 20130712

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 641745

Country of ref document: AT

Kind code of ref document: T

Effective date: 20131215

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602009020232

Country of ref document: DE

Effective date: 20140116

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20131120

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140220

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140320

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: VALMET TECHNOLOGIES, INC.

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20140328

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602009020232

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602009020232

Country of ref document: DE

26N No opposition filed

Effective date: 20140821

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140320

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20140320

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602009020232

Country of ref document: DE

Effective date: 20140821

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20141128

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602009020232

Country of ref document: DE

Effective date: 20141001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140320

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140331

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140331

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140331

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141001

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 641745

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140221

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20090320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131120