WO2009015700A1 - Utilisation de presses de lavage et à vis pour le lavage d'une matière première et d'une matière fibreuse - Google Patents

Utilisation de presses de lavage et à vis pour le lavage d'une matière première et d'une matière fibreuse Download PDF

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Publication number
WO2009015700A1
WO2009015700A1 PCT/EP2008/002087 EP2008002087W WO2009015700A1 WO 2009015700 A1 WO2009015700 A1 WO 2009015700A1 EP 2008002087 W EP2008002087 W EP 2008002087W WO 2009015700 A1 WO2009015700 A1 WO 2009015700A1
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WO
WIPO (PCT)
Prior art keywords
raw material
pulp
screw conveyor
liquid
screw
Prior art date
Application number
PCT/EP2008/002087
Other languages
German (de)
English (en)
Inventor
Esa-Matti Aalto
Hans-Ludwig Schubert
Original Assignee
Voith Patent Gmbh
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 Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2009015700A1 publication Critical patent/WO2009015700A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/40—Washing the fibres
    • 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
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp

Definitions

  • the invention relates to a method and an arrangement for washing lignocellulosic raw material and pulp.
  • Lignocellulosic raw material or fiber in the sense of this invention can be both the product of a mechanical and the product of a chemical process.
  • Mechanically generated pulp is present when chips pass through an abrasive aggregate or a refiner.
  • a pulp suspension is produced in which possibly not yet completely defibered components, so-called rejects, are contained.
  • the aim is to convert as much of the entire raw material as possible into pulp without loss of yield.
  • Chemically produced pulp is present when chips are digested under the influence of increased pressure, elevated temperature and chemicals. Immediately after digestion, wood chips (lignocellulosic raw material) are usually left unchanged, which are fiberized with minimal energy consumption. The aim is to capture the digestion chemicals as completely as possible and to recirculate them, for cost reasons and for reasons of process control. Digestion chemicals that can be used in the further process stages such. B. bleach be introduced, disturb there and prevent stable process control.
  • a screw press is used for mechanically generated fibrous materials and high yield fibers for dewatering.
  • the screw press is an inexpensive, reliable and compact system component. However, it is not suitable for carrying out a displacement washing described above.
  • a method for washing lignocellulosic raw material and / or pulp in which raw material and / or pulp first pass through a screw conveyor, liquid is added to the raw material and / or pulp, and then pass through a screw press in which liquid from the raw material and / or the pulp is pressed.
  • a screw conveyor can be easily equipped with means for supplying liquid, so that a displacement washing of the lignocellulosic raw material and / or the pulp is possible. It is advantageous here that a good and complete flow through of the raw material or of the hydrogen is achieved in a screw conveyor. Furthermore, the amount of liquid added to the screw conveyor can be easily metered. As the washing liquid, it is advantageous to use both water and filtrate from subsequent process stages, for example from the bleach.
  • the screw press is known. It points in the direction of promotion decreasing delivery volume. From the conveyed raw material or pulp suspension liquid is displaced, which exits via screen surfaces. In this way, the raw material or pulp suspension leaves the screw press with increased consistency. The sequential switching of these parts of the plant enables the efficient displacement washing not only of pulp. Rather, in this way, lignocellulosic raw material can be washed effectively.
  • At least part of the supplied liquid is discharged again in the screw conveyor.
  • the raw material or the pulp is washed efficiently.
  • a uniform volume flow for the raw material or pulp suspension to be washed can be set.
  • the inventive method is flexible.
  • the raw material to be washed and / or the pulp can pass through a sequence of screw conveyor and screw press at least two times in succession.
  • Such a multiple process management allows a highly flexible management of production.
  • the screw press is designed and operated such that the raw material and / or the pulp exits with a consistency of at least 25%, preferably of at least 30%, advantageously of at least 37.5%.
  • This high consistency ensures, on the one hand, that the laundry is done efficiently and completely, so that chemicals remaining in the raw material or pulp are effectively removed with the liquid.
  • the material density can be easily and precisely adjusted for the following process steps.
  • the liquid discharged from the screw press is collected and used for further use, in particular as a washing liquid for a raw material or a fibrous suspension, which has an even more heavily loaded liquid.
  • the method according to the invention can be carried out by using an arrangement for washing raw material and / or fibrous material, which comprises a screw conveyor having at least sections of means for supplying and discharging liquid and having a screw press arranged after the screw conveyor, which at least is designed in sections for the discharge of liquid.
  • the individual plant components are known per se, but they have not yet been used in the proposed arrangement according to the invention.
  • the arrangement according to the invention is designed so that the means for feeding as a perforated central tube or as a screen plate are formed in the wall of the screw conveyor.
  • Both versions ensure a uniform and complete flow through of the raw material or pulp to be washed. The washing result is very even.
  • the alternative constructions are simple and therefore stable in operation. They are also cheap.
  • the screw conveyor - or the Schnecken lakeer- are largely freely selectable in the dimensions.
  • the length of the screw conveyor can be selected largely freely.
  • the screw conveyor can be used in addition to the washing of raw material or pulp for conveying raw material and / or pulp.
  • the inventive arrangement of screw conveyor and screw press is therefore extremely flexible in the lineup.
  • Fig. 1 is a schematic representation of an arrangement of screw conveyor and screw press for lignocellulosic raw material
  • Fig. 2 is a schematic representation of an arrangement of screw conveyor and screw press for pulp
  • Fig. L shows a schematic representation of an arrangement 2 of screw conveyor and screw press, which are connected downstream of a digester 4 for high-yield pulp.
  • the lignocellulosic raw material is still in lumpy form. It is soaked with digestion solution containing chemicals and degradation products of the lignocellulosic raw material to be recovered for further use.
  • the raw material is conveyed from the digester 4 into a screw conveyor 6.
  • the screw conveyor 6 has a screw conveyor 10 which conveys the raw material or the raw material suspension from the cooker 4 to the screw press 8 in the operating direction.
  • the screw conveyor 10 has a constant diameter.
  • an access 14 for liquid is arranged at the exit 12 of the screw conveyor 6.
  • filtrate from the bleach is directed into the screw conveyor 6 and flows through the screw conveyor 6 against the operating direction (in countercurrent).
  • an outlet 16 for the washing liquid is arranged at the entrance of the screw conveyor. Filters at the inlet and outlet ensure that only liquid enters or exits.
  • Screw conveyor and screw press are made of metal. When selecting the material, it must be taken into account that the material withstands the process conditions of the laundry, in particular the pH values prevailing there.
  • the screw conveyor 6 is operated in such a way that the raw material from the cooker 4 is detected by the screw conveyor 10 and conveyed in the operating direction.
  • a tuned and measured amount of filtrate flows via the access 14 to the raw material, displacing digestion solution including the chemicals and degradation products contained therein from the surface and partially from the raw material.
  • the filtrate is enriched with digestion solution including chemicals and degradation products and finally exits at the outlet 16 from the screw conveyor 6.
  • the auger causes intensive mixing and thus an efficient washing process.
  • the filtrate is collected at the outlet 16 and fed to another use.
  • the washed out digestion solution can, for. B. be completely or partially fed to a treatment.
  • the screw press 8 has a pressing screw 18, which has a tapering in the operating direction diameter.
  • the housing 20 of the screw press 8 has a sieve bottom 22. Under the sieve plate 22, a collecting container 24 is arranged.
  • the screw press 8 is operated in such a manner that the washed raw material is conveyed by the press screw 18 in the operating direction. With each revolution, the available delivery volume becomes smaller. Liquid is displaced from the raw material or the raw material suspension and passes through the sieve bottom 22 into the collection container 24.
  • the consistency of the raw material increases depending on the design of the press-worm 18 to 25% or more.
  • the consistency desired for the raw material is determined depending on the further processing of the raw material. Fabric densities of more than 30%, if desired also more than 37.5% can be achieved.
  • Increasing the consistency of the material means that the opened raw material is already partially defibred or at least broken down into smaller pieces.
  • Fig. 2 shows a bleaching tower 3, is discharged from the bleached pulp in aqueous suspension.
  • the bleaching chemicals contained in the suspension and, where appropriate, degradation products of the pulp are to be washed out.
  • the inventive arrangement of screw conveyor and screw press is designed exactly as explained in the preceding embodiment.
  • the pulp suspension is introduced into the screw conveyor 6. At the same time water is supplied through the access 14, so that the conveyed in the operating direction pulp is washed in countercurrent.
  • the enriched with chemicals and possibly degradation products of the pulp water is collected at the outlet 16 and fed to another use.
  • the washed pulp is then transferred to the screw press 8 where it is compressed to a pulp density of 35%.
  • the emerging from the sieve plate 22 filtrate is collected and fed to another use.
  • the filtrate can be used to wash lignocellulosic raw material.

Landscapes

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

Abstract

L'invention concerne un procédé de lavage d'une matière première et/ou d'une matière fibreuse lignocellulosique(s), procédé selon lequel la matière première et/ou la matière fibreuse passe(nt) d'abord à travers un convoyeur à vis (6), un liquide étant ajouté à la matière première et/ou à la matière fibreuse, puis à travers une presse à vis (8), dans laquelle le liquide est extrait de la matière première et/ou de la matière fibreuse par pression, ainsi qu'un ensemble permettant la mise en oeuvre dudit procédé.
PCT/EP2008/002087 2007-07-31 2008-03-15 Utilisation de presses de lavage et à vis pour le lavage d'une matière première et d'une matière fibreuse WO2009015700A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007036377.1 2007-07-31
DE102007036377A DE102007036377A1 (de) 2007-07-31 2007-07-31 Einsatz von Wasch- und Schneckenpressen für die Rohmaterial- und Faserstoffwäsche

Publications (1)

Publication Number Publication Date
WO2009015700A1 true WO2009015700A1 (fr) 2009-02-05

Family

ID=39591565

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/002087 WO2009015700A1 (fr) 2007-07-31 2008-03-15 Utilisation de presses de lavage et à vis pour le lavage d'une matière première et d'une matière fibreuse

Country Status (2)

Country Link
DE (1) DE102007036377A1 (fr)
WO (1) WO2009015700A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595456A (en) * 1983-04-13 1986-06-17 Andersson Alf Ove Pulp washing process
US4915830A (en) * 1988-08-19 1990-04-10 Sprout-Bauer, Inc. Pulp wash press
WO1997013026A1 (fr) * 1995-10-02 1997-04-10 Alfa Laval Celleco Ab Appareil d'essorage, de pressurage et de lavage de la pate a papier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT14762B (de) 1902-12-07 1904-01-11 Julius Horvath Radschlitten.
DE404506C (de) * 1921-12-01 1924-10-18 A Olier Sa Des Ets Verfahren und Einrichtung zur Herstellung von Zellstoff aus holzhaltigem Rohstoff
AT107988B (de) * 1926-03-31 1927-11-25 Leykam Josefsthal Actien Ges F Verfahren und Vorrichtung zur Verarbeitung von Cellulose.
GB574310A (en) * 1944-01-31 1945-12-31 Frederick George Lucas Becker Improvements in or relating to apparatus for washing or mixing liquid with fibrous material
AT229690B (de) * 1960-04-09 1963-10-10 Gen Engineering Company Ab Vorrichtung zum Waschen und chemischen Behandeln von Materialien in einer Flüssigkeit
SE443383C (sv) * 1981-01-14 1987-11-16 Mo Och Domsjoe Ab Forfarande for tvettning av cellulosamassa

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4595456A (en) * 1983-04-13 1986-06-17 Andersson Alf Ove Pulp washing process
US4915830A (en) * 1988-08-19 1990-04-10 Sprout-Bauer, Inc. Pulp wash press
WO1997013026A1 (fr) * 1995-10-02 1997-04-10 Alfa Laval Celleco Ab Appareil d'essorage, de pressurage et de lavage de la pate a papier

Also Published As

Publication number Publication date
DE102007036377A1 (de) 2009-02-05

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