WO2005103373A2 - Procede de commande d'un processus de blanchiment pour le traitement des vieux papiers et dispositif de blanchiment permettant la mise en oeuvre dudit procede - Google Patents

Procede de commande d'un processus de blanchiment pour le traitement des vieux papiers et dispositif de blanchiment permettant la mise en oeuvre dudit procede Download PDF

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Publication number
WO2005103373A2
WO2005103373A2 PCT/EP2005/051729 EP2005051729W WO2005103373A2 WO 2005103373 A2 WO2005103373 A2 WO 2005103373A2 EP 2005051729 W EP2005051729 W EP 2005051729W WO 2005103373 A2 WO2005103373 A2 WO 2005103373A2
Authority
WO
WIPO (PCT)
Prior art keywords
bleaching
whiteness
fiber suspension
suspension
bleaching agent
Prior art date
Application number
PCT/EP2005/051729
Other languages
German (de)
English (en)
Other versions
WO2005103373A3 (fr
Inventor
Joachim Horn
Henning Lenz
Thomas Runkler
Markus Dinkel
Klaus Villforth
Reinhold GÖTZ
Volkmar Mickal
Thomas Schmidt
Albrecht Sieber
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP05740018A priority Critical patent/EP1740763A2/fr
Publication of WO2005103373A2 publication Critical patent/WO2005103373A2/fr
Publication of WO2005103373A3 publication Critical patent/WO2005103373A3/fr

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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
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02—Working-up waste paper
    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • 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
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1052—Controlling the process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • the invention relates to a method for controlling a bleaching process for waste paper processing, and a bleaching device for carrying out such a method.
  • Bleaching is an important process step in waste paper processing.
  • the whiteness e.g. the brightness
  • the color location e.g. red, green, blue
  • the bleaching agent usually contains the bleaching chemicals, such as hydrogen peroxide, and also activating and / or stabilizing chemicals, such as sodium hydroxide solution and water glass.
  • the bleaching process has been carried out by adding a predetermined amount of bleach to achieve a minimum bleaching effect, so that the whiteness of the fiber suspension after bleaching does not fall below a certain level or lies approximately within a certain white range.
  • the composition of the bleaching agent is also fixed, so that a certain bleaching effect is always achieved. If the amount of waste paper is changed, there may be fluctuations in the whiteness of the fiber suspension fed to the bleaching process due to different fiber qualities. Due to the bleaching agent added in a fixed amount and composition, the fiber suspension is bleached too much or too little, so that the whiteness of the fiber suspension after the bleaching process is either too low or too large. If the whiteness is too high, this must be reduced again, for example by adding color.
  • a method for controlling a bleaching process for waste paper processing is provided. If a fiber suspension is provided, the whiteness is measured and the fiber suspension is mixed with a bleaching agent. The mixed pulp suspension is fed into a bleaching container in order to be bleached for a certain period of time. The mixed fiber suspension is removed from the bleaching container after the certain period of time. The amount and / or the composition of the bleaching agent added is adjusted depending on the measured whiteness of the fiber suspension so that the desired whiteness of the fiber suspension removed is achieved as constant as possible.
  • the control method according to the invention for controlling the bleaching process therefore provides, depending on a measured whiteness the amount and / or the composition of the bleaching agent that is added to the fiber suspension to adjust the fiber suspension before the bleaching process.
  • the bleaching process can be carried out for each portion of the added fiber suspension with the amount and / or that composition of the added bleaching agent with which the bleaching process with the respective part of the fiber suspension is carried out in such a way that a certain target whiteness is reached at the end of the bleaching process.
  • the bleaching agent can have a mixture of several substances, the bleaching agent containing a bleaching chemical and / or a stabilizer chemical.
  • the amount and / or the composition of the bleaching agent is adjusted with the aid of an assignment scheme to the whiteness of the fiber suspension.
  • the assignment scheme can in particular be carried out using a function, a table or an assignment diagram.
  • An adaptation mode can be provided, in which the whiteness of the fiber suspension removed is compared with the desired whiteness and the assignment scheme is adapted depending on the result of the comparison.
  • a bleaching device for carrying out a bleaching process for the waste paper preparation.
  • the bleaching device has a bleaching container in which a fiber suspension is bleached using a bleaching agent. With the help of a feed, fiber suspension is introduced into the bleaching container. The whiteness of the pulp suspension in the feed line is measured with a white sensor and the fed in with the aid of a metering device
  • a control device is provided which is connected to the metering device in order to adjust the amount and / or the composition of the bleaching agent as a function of the measured whiteness of the fiber suspension supplied, so that the desired whiteness of the fiber suspension removed is achieved as constant as possible.
  • the bleaching device has the advantage that the bleaching process is influenced when a desired whiteness of the fiber suspension obtained after the bleaching process is specified and depending on the measured whiteness of the fiber suspension supplied, by adding bleaching agent in a suitable amount and / or in a suitable composition to the fiber suspension supplied ,
  • control device has a memory in order to store an assignment scheme in the form of a function, a table or an assignment diagram.
  • an assignment scheme in the form of a function, a table or an assignment diagram.
  • a discharge device can be provided in order to remove the fiber material to remove the pension from the bleaching container after a certain period of time, the removal device being connected to a further white sensor in order to measure the whiteness of the removed fiber suspension.
  • the control device is also designed to adapt the assignment scheme depending on the whiteness of the fiber suspension removed in an adaptation mode.
  • Figure 2 is an assignment diagram illustrating a function to describe the amount and / or the composition of the bleach to be added.
  • FIG. 1 shows part of a paper processing system.
  • a pre-flotation container 1 is shown, in which printing ink particles are discharged from a fibrous suspension formed from waste paper.
  • the fiber suspension which has been pre-cleaned in this way is fed to a disperser 3 via a feed line 2.
  • the disperser 3 is connected to a bleach container 4 via a further feed line 5.
  • a control valve 6 in order to adjust the amount of the bleaching agent supplied.
  • the disperser 3 serves to mix the supplied substances with the fibrous material suspension supplied via the feed line 2 and to feed them to a bleaching container 7.
  • the pulp suspension mixed with the bleaching agent is essentially crumbly or viscous, so that it settles over the pulp suspension already located in the bleaching container 7 without substantially mixing with it.
  • the bleaching container 7 has a stirring screw at its lower end, which drives the pulp suspension into a discharge line 8 and feeds it to a post-flotation container 9. From the post-flotation tank 9, the fibrous suspension arrives at the further stages of the waste paper processing system, at the end of which the production of processed paper can stand. ...
  • a control unit 11 is provided which is connected to a white sensor 12 which is arranged on the feed line 2.
  • the white sensor 12 measures the brightness or the color location of the fiber suspension just fed to the disperser.
  • the white sensor can be designed, for example, as an optical sensor that measures the reflection of incident light from the fiber suspension and determines the whiteness or the color location of the fiber suspension from it.
  • the control unit 11 is connected to the control valve 6, so that the control valve 6 can be set according to a control value by the control unit 11. If several control valves 6 are provided, these can be set individually by control values from the control unit 11.
  • the control unit 11 has a memory 14 in which an assignment scheme is stores. The assignment scheme can be stored as a function, assignment table or assignment diagram, and is used to determine a manipulated value for the control valve 6 or the control valves 6 depending on the white value of the fiber suspension 2 supplied measured by the white sensor 12.
  • the assignment diagram is learned on the basis of process data as a model of the bleaching effect as a function of the chemical concentration, for example as a neural network or Gaussian process. Given the desired white or target color location of the fiber suspension in the discharge line of the bleaching container and the measured whiteness or the measured color location at the entrance to the bleaching container, the required chemical concentration can thus be calculated. Existing Degrees of freedom can be used to minimize the deployment effort.
  • a further white sensor 13 is arranged on the discharge line 8 and is connected to the control unit 11.
  • the bleaching effect of the added bleaching agent in the respective concentration, amount and composition can now be determined and an assignment scheme can be created or readjusted in order to optimize the control of the bleaching process.
  • the deviations from the desired target whiteness and the whiteness actually achieved on the discharge line 8 of the bleaching container 7 can be used to adapt the assignment scheme, for example to determine an offset.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne un procédé de commande d'un processus de blanchiment pour le traitement des vieux papiers, lequel procédé consiste à préparer une suspension de matière fibreuse, à mesurer la blancheur de la suspension de matière fibreuse, à mélanger cette suspension de matière fibreuse avec un agent de blanchiment, à introduire la suspension de matière fibreuse mélangée dans un réservoir de blanchiment (7) et à extraire la suspension de matière fibreuse mélangée dudit réservoir de blanchiment après une durée déterminée. Ce procédé se caractérise en ce que l'agent de blanchiment contient un mélange de plusieurs substances, la quantité et/ou la composition de l'agent de blanchiment ajouté étant ajustée en fonction de la blancheur mesurée de la suspension de matière fibreuse, de sorte qu'une blancheur de consigne la plus constante possible est obtenue pour la suspension de matière fibreuse extraite.
PCT/EP2005/051729 2004-04-26 2005-04-19 Procede de commande d'un processus de blanchiment pour le traitement des vieux papiers et dispositif de blanchiment permettant la mise en oeuvre dudit procede WO2005103373A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05740018A EP1740763A2 (fr) 2004-04-26 2005-04-19 Procede de commande d'un processus de blanchiment pour le traitement des vieux papiers et dispositif de blanchiment permettant la mise en oeuvre dudit procede

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410020496 DE102004020496A1 (de) 2004-04-26 2004-04-26 Verfahren zum Steuern eines Bleichprozesses für die Altpapieraufbereitung, sowie eine Bleichvorrichtung zur Durchführung eines solchen Verfahrens
DE102004020496.9 2004-04-26

Publications (2)

Publication Number Publication Date
WO2005103373A2 true WO2005103373A2 (fr) 2005-11-03
WO2005103373A3 WO2005103373A3 (fr) 2007-04-12

Family

ID=34966582

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/051729 WO2005103373A2 (fr) 2004-04-26 2005-04-19 Procede de commande d'un processus de blanchiment pour le traitement des vieux papiers et dispositif de blanchiment permettant la mise en oeuvre dudit procede

Country Status (5)

Country Link
EP (1) EP1740763A2 (fr)
CN (1) CN101065535A (fr)
DE (1) DE102004020496A1 (fr)
RU (1) RU2346096C2 (fr)
WO (1) WO2005103373A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784210A1 (fr) * 2013-03-27 2014-10-01 Seiko Epson Corporation Appareil de fabrication de feuille et procédé de fabrication associé

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980517A (en) * 1974-07-17 1976-09-14 Sentrol Systems Ltd. Continuous on-machine control of bleaching chemicals
US4013506A (en) * 1974-07-22 1977-03-22 Canadian International Paper Company Method and apparatus for automatically and simultaneously controlling solution viscosity and brightness of a pulp during multi-stage bleaching
WO1995008019A1 (fr) * 1993-09-16 1995-03-23 Siemens Aktiengesellschaft Dispositif d'exploitation d'une installation de production de pate de cellulose desencree avec des analyseurs de l'etat de la suspension de vieux papiers constitues de reseaux neuraux
DE19653479C1 (de) * 1996-12-20 1998-09-03 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung beim Bleichen von Faserstoffen
DE19920338A1 (de) * 1999-05-03 2000-11-16 Voith Sulzer Papiertech Patent Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff
US6153300A (en) * 1994-04-18 2000-11-28 Ahlstrom Machinery, Inc. Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19510009C2 (de) * 1995-03-23 2000-05-11 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung einer Papiermaschine
DE19653530C1 (de) * 1996-12-20 1998-07-23 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung bei der Herstellung von Zellstoff
DE10043893A1 (de) * 2000-09-06 2002-03-14 Voith Paper Patent Gmbh Verfahren zur Durchführung eines der Faser- oder Papierherstellung dienenden Flotations-, Bleiche- und/oder Dispergierprozesses

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980517A (en) * 1974-07-17 1976-09-14 Sentrol Systems Ltd. Continuous on-machine control of bleaching chemicals
US4013506A (en) * 1974-07-22 1977-03-22 Canadian International Paper Company Method and apparatus for automatically and simultaneously controlling solution viscosity and brightness of a pulp during multi-stage bleaching
WO1995008019A1 (fr) * 1993-09-16 1995-03-23 Siemens Aktiengesellschaft Dispositif d'exploitation d'une installation de production de pate de cellulose desencree avec des analyseurs de l'etat de la suspension de vieux papiers constitues de reseaux neuraux
US6153300A (en) * 1994-04-18 2000-11-28 Ahlstrom Machinery, Inc. Bleaching cellulose pulp having cleanliness which varies significantly over time using at least two different bleaching stages and bleaching chemicals
DE19653479C1 (de) * 1996-12-20 1998-09-03 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung beim Bleichen von Faserstoffen
DE19920338A1 (de) * 1999-05-03 2000-11-16 Voith Sulzer Papiertech Patent Verfahren zur Erhöhung des Weißgrades von Papierfaserstoff

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2784210A1 (fr) * 2013-03-27 2014-10-01 Seiko Epson Corporation Appareil de fabrication de feuille et procédé de fabrication associé
CN104074083A (zh) * 2013-03-27 2014-10-01 精工爱普生株式会社 薄片制造装置、薄片的制造方法
US9315944B2 (en) 2013-03-27 2016-04-19 Seiko Epson Corporation Sheet manufacturing apparatus and method for manufacturing sheet

Also Published As

Publication number Publication date
DE102004020496A1 (de) 2005-11-17
EP1740763A2 (fr) 2007-01-10
RU2346096C2 (ru) 2009-02-10
RU2006141637A (ru) 2008-06-10
WO2005103373A3 (fr) 2007-04-12
CN101065535A (zh) 2007-10-31

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