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WO1999001612A1 - Method for minimizing water use in a water circuit in a paper, cellulose or wood factory - Google Patents

Method for minimizing water use in a water circuit in a paper, cellulose or wood factory Download PDF

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Publication number
WO1999001612A1
WO1999001612A1 PCT/EP1998/004047 EP9804047W WO9901612A1 WO 1999001612 A1 WO1999001612 A1 WO 1999001612A1 EP 9804047 W EP9804047 W EP 9804047W WO 9901612 A1 WO9901612 A1 WO 9901612A1
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WO
WIPO (PCT)
Prior art keywords
measurement
regulated
paper
water
concentration
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.)
Ceased
Application number
PCT/EP1998/004047
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German (de)
French (fr)
Inventor
Johannes Kappel
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Andritz Patentverwaltungs GmbH
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Andritz Patentverwaltungs 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 Andritz Patentverwaltungs GmbH filed Critical Andritz Patentverwaltungs GmbH
Priority to AU88049/98A priority Critical patent/AU8804998A/en
Publication of WO1999001612A1 publication Critical patent/WO1999001612A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0021—Introduction of various effluents, e.g. waste waters, into the pulping, recovery and regeneration cycle (closed-cycle)
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/08—Controlling the addition by measuring pulp properties, e.g. zeta potential, pH

Definitions

  • the invention relates to a method for minimizing the use of water by regulating the concentration of contaminants in a water cycle of a paper / pulp or wood pulp mill.
  • EP 0 728 864 proposes a control strategy for wastewater-free pulp factories.
  • the aim of the invention is to minimize the use of fresh water in a paper and fiber mill by regulating the concentration of contaminants in the water circuits.
  • the invention is therefore characterized in that the concentration of impurities is measured either in the paper machine circuit and / or in a filtrate circuit, preferably in the last filtrate circuit, of a strand of material and the discharge of impurities is regulated.
  • a favorable further development of the invention is characterized in that the fresh water supply is regulated.
  • An advantageous embodiment of the invention is characterized in that the measurement of the impurity concentration is carried out by means of IR spectroscopy, automatic charge titration, turbidity measurement, measurement of the cationic requirement or COD measurement.
  • An advantageous development of the invention is characterized in that process parameters such as bleaching conditions and / or the use of chemicals are regulated.
  • a favorable embodiment of the method according to the invention is characterized in that system parameters such as dry contents of the presses are regulated.
  • a favorable development of the invention is characterized in that the proportions of the individual substances are varied in the case of several strands of material.
  • An advantageous embodiment of the invention is characterized in that the proportion of the committee is regulated.
  • FIG. 1 shows a block diagram of a customary integrated pulp and paper mill
  • FIG. 2 shows an analog block diagram according to the invention.
  • FIG. 1 the block diagram of an integrated pulp and paper factory is shown, in which the pulp (wood or waste paper) in 1 a first circuit (2) after the exposure of the fibers and subsequently a second circuit 3 and further circuits X ( 4) is supplied. The pulp is then fed into a paper machine 5 and as paper 6 it leaves the factory.
  • Fresh water 7 is usually used on the paper machine 5 and the filtrates are passed in countercurrent to the fibrous material via lines 8, 9 and 10, whereby the highest possible concentration of impurities is achieved.
  • the discharge takes place via line 11 in the first circuit 2.
  • additional discharges, not shown, or fresh water additions are possible.
  • one or more paper machines 5 can be supplied by one or more strands 1.
  • FIG. 2 now shows an analog block diagram to FIG. 1, in which the use of the optimization system 12 is clearly recognizable.
  • the concentration of impurities is measured using a measuring device 13, preferably by IR spectrography, for example in the filtrate circuit 8 of the paper machine measured.
  • the impurity concentration in the filtrate circuit 9 of one or more of the circuits X (4) is measured by means of a measuring device 14.
  • the optimization system which can have fuzzy logic, for example, regulates the fresh water supply 7 and thus the removal of impurities via a valve 15, which can alternatively be regulated via a valve 16. If the countercurrent flow is not complete, the fresh water supply or discharge can also take place at other points. But it can also the process parameters of the circuits, for. B. bleaching conditions, use of chemicals via control lines 17, 17 'and / or the system parameters such as dry contents of presses via control lines 18, 18' can be influenced by the optimization system 12.
  • the proportions of the individual substances can also be varied so as not to exceed the permissible impurity concentrations on the paper machine.
  • the proportion of the use of the self-committee can be regulated within certain limits. If a circuit water purification stage is installed, this can also be regulated by the optimization system.

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  • Paper (AREA)

Abstract

The invention relates to a method for minimizing water use in a water circuit in a paper, cellulose or wood factory by adjusting the concentration of interfering substances. The inventive method is chiefly characterized in that the concentration of interfering substances in a paper machine (8) circuit and/or in a filtering circuit, preferably in the final filtering circuit (9), pertaining to a strand of material (13, 14) is measured and the outward transfer (11) of interfering substances is regulated (16).

Description

Verfahren zur Minimierung des Wassereinsatzes in einem Wasserkreislauf einer Papier-ZZellstoff- oder HolzstofffabrikProcess for minimizing the use of water in a water cycle of a paper, cellulose or wood pulp mill

Die Erfindung betrifft ein Verfahren zur Minimierung des Wassereinsatzes durch Regelung der Störstoffkonzentration in einem Wasserkreislauf einer Papier-/Zellstoff- oder Holzstofffabrik.The invention relates to a method for minimizing the use of water by regulating the concentration of contaminants in a water cycle of a paper / pulp or wood pulp mill.

Durch die immer weitergehende Schließung der Wasserkreisläufe in den Papier- und Faserstofffabriken steigen die Konzentrationen an Störstoffen, auch unter dem Begriff Anionic Trash zusammengefaßt, an, so daß sie zu ernsten Problemen an den Papiermaschinen führen können. Durch den Einsatz von möglichst effizienten Pressen kann die Wasserkreislauftrennung von den Apparaten her optimiert werden. So schlägt die EP 0 728 864 eine Regelstrategie für abwasserfreie Zellstofffabriken vor. Ziel der Erfindung ist es, den Frischwassereinsatz in einer Papier- und Faserstofffabrik durch Regelung der Störstoffkonzentration in den Wasserkreisläufen zu minimieren.Due to the ever-increasing closure of the water cycles in the paper and fiber mills, the concentrations of contaminants, also summarized under the term anionic trash, increase, so that they can lead to serious problems on the paper machines. By using presses that are as efficient as possible, the water cycle separation can be optimized from the apparatus. For example, EP 0 728 864 proposes a control strategy for wastewater-free pulp factories. The aim of the invention is to minimize the use of fresh water in a paper and fiber mill by regulating the concentration of contaminants in the water circuits.

Die Erfindung ist daher dadurch gekennzeichnet, daß die Störstoffkonzentration entweder im Papiermaschinenkreislauf und/oder in einem Filtratkreislauf, bevorzugt im letzten Filtratkreislauf, eines Stoffstranges gemessen und die Störstoffausschleusung geregelt wird. Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß die Frischwasserzufuhr geregelt wird. Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels IR-Spektroskopie, automatischer Ladungstitration, Trübungsmessung, Messung des kationischen Bedarfes oder CSB-Messung erfolgt.The invention is therefore characterized in that the concentration of impurities is measured either in the paper machine circuit and / or in a filtrate circuit, preferably in the last filtrate circuit, of a strand of material and the discharge of impurities is regulated. A favorable further development of the invention is characterized in that the fresh water supply is regulated. An advantageous embodiment of the invention is characterized in that the measurement of the impurity concentration is carried out by means of IR spectroscopy, automatic charge titration, turbidity measurement, measurement of the cationic requirement or COD measurement.

Eine vorteilhafte Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß Prozeßparameter wie z.B. Bleichbedingungen und/oder Chemikalieneinsatz geregelt werden. Eine günstige Ausgestaltung des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, daß Anlagenparameter wie z.B. Trockengehalte der Pressen geregelt werden.An advantageous development of the invention is characterized in that process parameters such as bleaching conditions and / or the use of chemicals are regulated. A favorable embodiment of the method according to the invention is characterized in that system parameters such as dry contents of the presses are regulated.

Eine günstige Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß bei mehreren Stoffsträngen die Anteile der einzelnen Stoffe variiert werden. Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß der Anteil an Eigenausschuß geregelt wird.A favorable development of the invention is characterized in that the proportions of the individual substances are varied in the case of several strands of material. An advantageous embodiment of the invention is characterized in that the proportion of the committee is regulated.

Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, daß eine Kreislaufwasserreinigungsstufe geregelt wird. Die Erfindung wird nun anhand der Zeichnungen beispielhaft erläutert, wobei Fig. 1 ein Blockdiagramm einer üblichen integrierten Faserstoff- und Papierfabrik und Fig. 2 ein analoges Blockdiagramm gemäß der Erfindung darstellt. In Fig. 1 ist das Blockschaltbild einer integrierten Faserstoff- und Papierfabrik dargestellt, bei dem der Faserstoff (Holz oder Altpapier) bei 1 einem ersten Kreislauf (2) nach dem Freilegen der Fasern und in weiterer Folge einem zweiten Kreislauf 3 und weiteren Kreisläufen X (4) zugeführt wird. Anschließend wird der Faserstoff einer Papiermaschine 5 aufgegeben und als Papier 6 verläßt er die Fabrik. Frischwasser 7 setzt man üblicherweise an der Papiermaschine 5 ein und führt die Filtrate im Gegenstrom zum Faserstoff über Leitungen 8, 9 und 10, wodurch man eine möglichst hohe Aufkonzentrierung von Störstoffen erreicht. Die Ausschleusung erfolgt über Leitung 11 im ersten Kreislauf 2. Weiters sind zusätzliche, nicht dargestellte, Ausschleusungen oder Frischwasserzugaben möglich. Je nach Anlage können dabei eine oder mehrere Papiermaschinen 5 von einem oder mehreren Stoffsträngen 1 versorgt werden. Fig. 2 zeigt nun ein analoges Blockdiagramm zu Fig. 1 , bei dem der Einsatz des Optimierungssystems 12 gut erkennbar ist. Es wird hier die Störstoffkonzentration mittels einer Meßeinrichtung 13, bevorzugt durch IR- Spektrographie, beispielsweise im Filtratkreislauf 8 der Papiermaschine gemessen. Alternativ oder auch zusätzlich wird die Störstoffkonzentration im Filtratkreislauf 9 eines oder mehrerer des Kreisläufe X (4) mittels einer Meßeinrichtung 14 gemessen. Das Optimierungssystem, das z.B. eine Fuzzy Logic aufweisen kann, regelt dabei über ein Ventil 15 die Frischwasserzufuhr 7 und damit die Störstoffausschleusung, wobei diese alternativ über ein Ventil 16 geregelt werden kann. Bei nicht gänzlicher Gegenstromführung können die Frischwasserzuführungen oder die Ausschleusungen auch an anderen Stellen erfolgen. Es können aber auch die Prozeßparameter der Kreisläufe, z. B. Bleichbedingungen, Chemikalieneinsatz über Regelleitungen 17, 17' und/oder die Anlagenparameter wie z.B. Trockengehalte von Pressen über Regelleitungen 18, 18' durch das Optimierungssystem 12 beeinflußt werden. Bei mehreren Stoffsträngen können auch die Anteile der einzelnen Stoffe variiert werden, um so die zulässigen Störstoffkonzentrationen an der Papiermaschine nicht zu überschreiten. Insbesondere ist der Anteil des Einsatzes des Eigenausschusses in bestimmten Grenzen regelbar. Ist eine Kreislaufwasserreinigungsstufe installiert, so kann auch diese durch das Optimierungssystem geregelt werden. An advantageous embodiment of the invention is characterized in that a circuit water purification stage is regulated. The invention will now be explained by way of example with reference to the drawings, in which FIG. 1 shows a block diagram of a customary integrated pulp and paper mill and FIG. 2 shows an analog block diagram according to the invention. In Fig. 1 the block diagram of an integrated pulp and paper factory is shown, in which the pulp (wood or waste paper) in 1 a first circuit (2) after the exposure of the fibers and subsequently a second circuit 3 and further circuits X ( 4) is supplied. The pulp is then fed into a paper machine 5 and as paper 6 it leaves the factory. Fresh water 7 is usually used on the paper machine 5 and the filtrates are passed in countercurrent to the fibrous material via lines 8, 9 and 10, whereby the highest possible concentration of impurities is achieved. The discharge takes place via line 11 in the first circuit 2. Furthermore, additional discharges, not shown, or fresh water additions are possible. Depending on the system, one or more paper machines 5 can be supplied by one or more strands 1. FIG. 2 now shows an analog block diagram to FIG. 1, in which the use of the optimization system 12 is clearly recognizable. Here, the concentration of impurities is measured using a measuring device 13, preferably by IR spectrography, for example in the filtrate circuit 8 of the paper machine measured. Alternatively or additionally, the impurity concentration in the filtrate circuit 9 of one or more of the circuits X (4) is measured by means of a measuring device 14. The optimization system, which can have fuzzy logic, for example, regulates the fresh water supply 7 and thus the removal of impurities via a valve 15, which can alternatively be regulated via a valve 16. If the countercurrent flow is not complete, the fresh water supply or discharge can also take place at other points. But it can also the process parameters of the circuits, for. B. bleaching conditions, use of chemicals via control lines 17, 17 'and / or the system parameters such as dry contents of presses via control lines 18, 18' can be influenced by the optimization system 12. If there are several strands of material, the proportions of the individual substances can also be varied so as not to exceed the permissible impurity concentrations on the paper machine. In particular, the proportion of the use of the self-committee can be regulated within certain limits. If a circuit water purification stage is installed, this can also be regulated by the optimization system.

Claims

Ansprüche: Expectations: 1. Verfahren zur Minimierung des Wassereinsatzes durch Regelung der Störstoffkonzentration in einem Wasserkreislauf einer Papier-/Zellstoff- oder Holzstofffabrik, dadurch gekennzeichnet, daß die Störstoffkonzentration entweder im Papiermaschinenkreislauf und/oder in einem Filtratkreislauf, bevorzugt im letzten Filtratkreislauf, eines Stoffstranges gemessen und die Störstoffausschleusung geregelt wird. 1. A method for minimizing the use of water by controlling the concentration of contaminants in a water cycle of a paper / pulp or pulp mill, characterized in that the concentration of contaminants is measured either in the paper machine cycle and / or in a filtrate cycle, preferably in the last filtrate cycle, of a strand of material and the discharge of contaminants is regulated. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Frischwasserzufuhr geregelt wird.2. The method according to claim 1, characterized in that the fresh water supply is regulated. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels IR-Spektroskopie erfolgt.3. The method according to claim 1 or 2, characterized in that the measurement of the impurity concentration is carried out by means of IR spectroscopy. 4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels automatischer Ladungstitration erfolgt.4. The method according to claim 1 or 2, characterized in that the measurement of the impurity concentration is carried out by means of automatic charge titration. 5. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels Trübungsmessung erfolgt.5. The method according to claim 1 or 2, characterized in that the measurement of the impurity concentration is carried out by means of turbidity measurement. 6. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels -Messung des kationischen6. The method according to claim 1 or 2, characterized in that the measurement of the impurity concentration by means of measurement of the cationic Bedarfes erfolgt.If necessary. 7. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Messung der Störstoffkonzentration mittels CSB-Messung erfolgt.7. The method according to claim 1 or 2, characterized in that the measurement of the impurity concentration is carried out by means of COD measurement. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß Prozeßparameter wie z.B. Bleichbedingungen und/oder8. The method according to any one of claims 1 to 7, characterized in that process parameters such as e.g. Bleaching conditions and / or Chemikalieneinsatz geregelt werden.Use of chemicals are regulated. 9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß Anlagenparameter wie z.B. Trockengehalte der Pressen geregelt werden. 9. The method according to any one of claims 1 to 8, characterized in that system parameters such as dry contents of the presses are regulated. 10.Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß bei mehreren Stoffsträngen die Anteile der einzelnen Stoffe variiert werden. 10.The method according to any one of claims 1 to 9, characterized in that the proportions of the individual substances are varied in several strands. 11.Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß der Anteil an Eigenausschuß geregelt wird. 11.The method according to any one of claims 1 to 10, characterized in that the proportion of the committee is regulated. 12.Verfahren nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, daß eine Kreislaufwasserreinigungsstufe geregelt wird. 12.The method according to any one of claims 1 to 11, characterized in that a circuit water purification stage is regulated.
PCT/EP1998/004047 1997-07-01 1998-07-01 Method for minimizing water use in a water circuit in a paper, cellulose or wood factory Ceased WO1999001612A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU88049/98A AU8804998A (en) 1997-07-01 1998-07-01 Method for minimizing water use in a water circuit in a paper, cellulose or woodfactory

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1121/97 1997-07-01
AT112197A AT405061B (en) 1997-07-01 1997-07-01 METHOD FOR MINIMIZING THE USE OF WATER IN A WATER CIRCUIT OF A PAPER / PULP OR FUEL FACTORY

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WO1999001612A1 true WO1999001612A1 (en) 1999-01-14

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AU (1) AU8804998A (en)
WO (1) WO1999001612A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027383A1 (en) * 1999-10-12 2001-04-19 Der Grüne Punkt - Duales System Deutschland Ag Method for minimising the new water use in the water circulation system of a treatment plant

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Publication number Priority date Publication date Assignee Title
US4752356A (en) * 1985-10-18 1988-06-21 Miami University Papermaking process
US4758308A (en) * 1985-03-05 1988-07-19 Carr Wayne F System for monitoring contaminants with a detector in a paper pulp stream
WO1992017642A1 (en) * 1991-04-08 1992-10-15 Oy Keskuslaboratorio - Centrallaboratorium Ab Diagnosing disturbances in the wet part chemistry of a paper machine
EP0627522A1 (en) * 1993-05-26 1994-12-07 Degussa Aktiengesellschaft Improved process for the bleaching of mechanical pulps
WO1995008019A1 (en) * 1993-09-16 1995-03-23 Siemens Aktiengesellschaft Device for controlling a deinked cellulose production plant with state analysers constituted of neural networks for the waste paper suspension
EP0728864A2 (en) * 1993-03-02 1996-08-28 Kamyr Inc. Zero discharge pulp mill cascading water management

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Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US4758308A (en) * 1985-03-05 1988-07-19 Carr Wayne F System for monitoring contaminants with a detector in a paper pulp stream
US4752356A (en) * 1985-10-18 1988-06-21 Miami University Papermaking process
WO1992017642A1 (en) * 1991-04-08 1992-10-15 Oy Keskuslaboratorio - Centrallaboratorium Ab Diagnosing disturbances in the wet part chemistry of a paper machine
EP0728864A2 (en) * 1993-03-02 1996-08-28 Kamyr Inc. Zero discharge pulp mill cascading water management
EP0627522A1 (en) * 1993-05-26 1994-12-07 Degussa Aktiengesellschaft Improved process for the bleaching of mechanical pulps
WO1995008019A1 (en) * 1993-09-16 1995-03-23 Siemens Aktiengesellschaft Device for controlling a deinked cellulose production plant with state analysers constituted of neural networks for the waste paper suspension

Non-Patent Citations (1)

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Title
STETTER, A. ET AL: "Erfahrungen mit Mess- und Regelanlagen im Kreislauf der Altpapieraufbereitung", WOCHENBL. PAPIERFABR. 121, NR. 23/24: 1018-1023 (DEZEMBER 15, 1993), XP002084075 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001027383A1 (en) * 1999-10-12 2001-04-19 Der Grüne Punkt - Duales System Deutschland Ag Method for minimising the new water use in the water circulation system of a treatment plant
US6767463B1 (en) 1999-10-12 2004-07-27 Der Grune Punkt-Duales System Deutschland Ag Method for minimizing the new water use in the water circulation system of a treatment plant

Also Published As

Publication number Publication date
ATA112197A (en) 1998-09-15
AT405061B (en) 1999-05-25
AU8804998A (en) 1999-01-25

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