EP3559342B1 - Installation pour traiter une eau de traitement - Google Patents

Installation pour traiter une eau de traitement Download PDF

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Publication number
EP3559342B1
EP3559342B1 EP17801678.8A EP17801678A EP3559342B1 EP 3559342 B1 EP3559342 B1 EP 3559342B1 EP 17801678 A EP17801678 A EP 17801678A EP 3559342 B1 EP3559342 B1 EP 3559342B1
Authority
EP
European Patent Office
Prior art keywords
process water
machine
sorting
washing device
led
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.)
Not-in-force
Application number
EP17801678.8A
Other languages
German (de)
English (en)
Other versions
EP3559342A1 (fr
Inventor
Christoph Strempfl
Eckhard Gutsmuths
Falk Albrecht
Christoph Adams
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.)
Voith Patent GmbH
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP3559342A1 publication Critical patent/EP3559342A1/fr
Application granted granted Critical
Publication of EP3559342B1 publication Critical patent/EP3559342B1/fr
Not-in-force 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
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D99/00—Subject matter not provided for in other groups of this subclass
    • 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
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation

Definitions

  • the invention relates to a system for treating process water of a machine for producing and / or finishing a paper, cardboard, tissue or other fibrous web, the process water being divided into several sub-fractions with different proportions of fibers in a sorting or filtering device becomes.
  • the invention also relates to a method for operating this plant.
  • paper fiber suspensions of the type used to produce a fibrous web contain not only the actual paper fibers, but also a more or less large amount of fine solids.
  • fine solids can be mineral fillers, which are usually necessary for paper production. They are mostly called "ash" because the mineral fillers are non-flammable. However, it can also be fiber fragments that arise, for example, when the fibers are ground. These are also called fines.
  • the consistency of the paper fiber suspension in the stock preparation of a paper machine needs to be increased for process engineering reasons, it is thickened. Not only some of the water but also some of the fine solids pass into the filtrate, which is why the filtrate is usually composed of water, fines and fillers. In the usual process management, this filtrate is used where the pulp suspension has to be diluted at an upstream point for process engineering reasons. In this way, the fine solids are not lost, but it is possible that the accumulation of fines and fillers in the filtrates becomes relatively large. Therefore, this method of returning the filtrate, which is favorable in itself, can lead to disruptions in the process flow. The same applies to the process water of the machine, which mainly accumulates in the former for sheet formation and in the press section for dewatering the fibrous web and is reused in the machine or the upstream stock preparation.
  • the object of the invention is therefore in particular to reduce the proportion of fillers in the fibrous web with as little effort and fiber losses as possible, if necessary.
  • the object was achieved in that at least two partial fractions are at least partially fed over at least a predetermined period of time to a common washing device, the fine fraction of this washing device to a flotation device and the acceptance of this flotation device of the machine, another machine for producing a fibrous web or an upstream machine Process for treating a pulp suspension is fed.
  • the system is particularly suitable for treating the process water that is heavily loaded with fibers, fines and fillers from the former of the sheet forming machine.
  • This process water can at least partially be fed to the sorting or filtering device.
  • the sub-fractions of the sorting or filtering device usually have a high proportion of fines and fillers, which is higher than that of the waste paper used and the paper produced.
  • a partial fraction with a higher fiber content preferably the partial flow of the sorting or filter device with the highest fiber content, also has a Filler-containing, preferably high-filler-containing partial fraction of the sorting or filter device is diluted and fed to the washing device.
  • chemicals or other process water from the machine or an upstream process for treating a fiber suspension to dilute the partial flow with a high fiber content can also be fed to the washing device.
  • the white water of the paper machine for example, is also suitable for this.
  • the sorting or filter device is advantageously designed as a disc filter.
  • Disk filters have been known for a long time and are used to separate liquids from a suspension. According to their proportion of fibers, fillers and fines, the partial flows of the disc filter are referred to as fiber filtrate (also called catching material), cloudy filtrate, clear filtrate and super clear filtrate.
  • a pressure release flotation device is particularly suitable as a flotation device for separating off the fillers.
  • relaxation flotation the process water is saturated with air at overpressure and then fed into a flotation tank. After relaxation, the excess air bubbles out in the form of fine bubbles. The gas bubbles bind the fine and fillers and carry them to the surface of the flotation tank, where they can be cleared away.
  • Machines for producing a fibrous web generally also have a press section for dewatering the fibrous web. Because of the contact with the press felts that are passed through the press nips Process water from the press section in addition to fibers, fine and fillers, as well as felt hair. In general, the process water from the press section can at least partially be fed directly to the washing device or to the flotation device. In particular, for the separation of the felt hair, it can be advantageous if the process water of the press section is previously passed through another sorting device, for example an ultra-fine sorter or a curved screen.
  • another sorting device for example an ultra-fine sorter or a curved screen.
  • a pulp suspension is produced in that the paper material is increasingly processed mechanically and possibly chemically in the form of waste paper with water in a dissolution so that a pumpable pulp suspension is created.
  • the subsequent first cleaning can be provided, for example, with pressure sorters and hydrocyclones in order to separate out the coarse impurities as early as possible.
  • the cleaned pulp suspension passes directly one after the other into the upstream thickening, which is preferably carried out with a filter device, for example with a sieve press, a disc filter or a screw press.
  • the pulp After thickening, the pulp has a much higher consistency (e.g. 15 to 30%) and is processed into the fabric, where one or more process steps are carried out that make this higher consistency necessary.
  • This can e.g. usually be a dispersion with or without bleach, for which the auxiliaries are supplied in the form of energy and / or chemicals.
  • the fabric After the high-consistency treatment, the fabric is diluted again.
  • the finished fiber suspension is provided in a fabric template for processing on the paper or board machine.
  • the paper or board machine is only hinted at here.
  • Some of the white water that accumulates there can be used as dilution water in stock preparation, for example to provide some of the water for dissolution or to carry out additional dilution elsewhere.
  • a later white water with a lower ash content e.g. white water or press water, can be used.
  • the proportion of fillers and fines is so high, even with this process water, that ash removal is necessary.
  • the waste water 16 from the former 7 of the machine in which the sheet formation takes place is at least partially conveyed into a sorting and filtering device 1 in the form of a disc filter.
  • the other part of the process water 16 of the former can be fed to a white water vat 5.
  • the wastewater is then divided into several partial fractions 9, 10, which are generally referred to as fiber filtrate, cloudy filtrate, clear filtrate or super clear filtrate.
  • the figure shows the division into a partial fraction 9 with a high fiber content, which corresponds to the fiber filtrate, and into another partial fraction 10 with a low fiber content.
  • Both sub-fractions 9, 10 still contain a great deal of fine and fillers, i.e. ash.
  • ash i.e. fine and fillers
  • at least part of the partial fraction 9 has a high fiber content and the other partial fraction 10 has a low fiber content Fiber content and, if necessary, also process water from the white water vat 5 to a washing device 2.
  • the coarse fraction 11 of the washing device 2 contains a high proportion of fibers and a relatively low proportion of fines and fillers and can therefore be used without problems in the stock preparation or in the constant part of the machine.
  • the coarse fraction 11 of the washing device 2 is therefore returned to a material vat 6, possibly via a buffer vat 18.
  • Known inclined screens, curved screens, drum thickeners, etc. are suitable as washing device 2.
  • the fine and filler-rich fine fraction 12 of the washing device 2 arrives here, for example, together with chemicals 14 for stock preparation and process water 13 from the press section 8 of the paper machine in a flotation device 3 in the form of a decompression flotation device.
  • the accept 15 of the flotation device 3 can be fed as dilution water to the paper machine or the upstream stock preparation, here to the white water vat 5.
  • this flotation device 3 can also be used to separate out micro stickies in reject 17.
  • the press section 8 serves to dewater the fibrous web, which for this purpose is guided through one or more roller press nips together with press felts.
  • the process water 13 of the press section 8 therefore also has a considerable proportion of felt hair, which is removed by means of a sorting device 4 before being fed into the flotation device 3 and / or the washing device 2.
  • the plant unit with the washing device 2 and the flotation device 3 can be in constant operation to discharge ash from the process.

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  • Paper (AREA)

Claims (10)

  1. Installation pour le traitement d'eau de procédé d'une machine pour la fabrication et/ou la finition d'une bande de papier, de carton, de papier ouaté ou d'une autre matière fibreuse, dans laquelle l'eau de procédé est divisée dans un dispositif de tri ou de filtration (1) en plusieurs fractions partielles (9, 10) ayant différentes proportions de fibres, caractérisée en ce qu'au moins deux fractions partielles (9, 10) sont acheminées au moins partiellement pendant au moins une période de temps prédéterminée vers un dispositif de lavage commun (2), la fraction fine (12) de ce dispositif de lavage (2) peut être conduite vers un dispositif de flottation (3) et la fraction acceptée (15) de ce dispositif de flottation (3) peut être conduite vers la machine, vers une autre machine pour la fabrication d'une bande de matière fibreuse ou vers un procédé en amont pour le traitement d'une suspension de matière fibreuse.
  2. Installation selon la revendication 1, caractérisée en ce que la fraction grossière (11) du dispositif de lavage (2) peut être recyclée dans le circuit de matière de la machine ou dans un procédé en amont pour le traitement d'une suspension de matière fibreuse.
  3. Installation selon la revendication 1 ou 2, caractérisée en ce qu'une autre eau de procédé de la machine ou d'un procédé en amont pour le traitement d'une suspension de matière fibreuse peut également être conduite vers dispositif de lavage (2).
  4. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que la fraction partielle (9) du dispositif de tri ou de filtration (1) ayant la proportion de fibres la plus élevée est acheminée vers le dispositif de lavage (2).
  5. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de flottation (3) est réalisé sous la forme d'un dispositif de flottation à détente de pression.
  6. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de tri ou de filtration (1) est configuré sous la forme d'un filtre à disques.
  7. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que de l'eau de procédé (16) d'un formeur (7) pour la formation de feuilles peut être acheminée au moins partiellement vers le dispositif de tri ou de filtration (1).
  8. Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que de l'eau de procédé (13) d'une partie de pressage (8) pour la déshydratation de la bande de matière fibreuse peut être conduite au moins partiellement vers le dispositif de lavage (2) et/ou vers le dispositif de flottation (3) .
  9. Installation selon la revendication 8, caractérisée en ce qu'elle comprend un dispositif de tri (4) pour l'eau de procédé (13) de la partie de pressage (8) avant le dispositif de lavage (2) ou le dispositif de flottation (3).
  10. Procédé d'exploitation d'une installation selon l'une quelconque des revendications précédentes, caractérisé en ce que les fractions partielles (9, 10) du dispositif de tri ou de filtration (1) ne sont conduites vers le dispositif de lavage (2) que pendant des intervalles de temps déterminés afin d'abaisser la teneur en charges moyenne de l'eau de procédé réutilisée dans la machine.
EP17801678.8A 2016-12-22 2017-11-16 Installation pour traiter une eau de traitement Not-in-force EP3559342B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016125303.0A DE102016125303B4 (de) 2016-12-22 2016-12-22 Anlage zur Prozesswasserbehandlung
PCT/EP2017/079411 WO2018114153A1 (fr) 2016-12-22 2017-11-16 Installation pour traiter une eau de traitement

Publications (2)

Publication Number Publication Date
EP3559342A1 EP3559342A1 (fr) 2019-10-30
EP3559342B1 true EP3559342B1 (fr) 2020-12-30

Family

ID=60421773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17801678.8A Not-in-force EP3559342B1 (fr) 2016-12-22 2017-11-16 Installation pour traiter une eau de traitement

Country Status (4)

Country Link
EP (1) EP3559342B1 (fr)
CN (1) CN109983175B (fr)
DE (1) DE102016125303B4 (fr)
WO (1) WO2018114153A1 (fr)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4238336A1 (de) * 1992-11-13 1994-05-19 Voith Gmbh J M Reinigung von Altpapiersuspensionen durch Flotation
FI111466B (fi) 1998-11-20 2003-07-31 Andritz Oy Menetelmä ja laitteisto hylkymassan käsittelemiseksi
DE19914779A1 (de) * 1999-03-31 2000-10-05 Meri Entsorgungstech Papierind Wasserkreislaufaufbereitung für Papiermaschinen
DE10218265C1 (de) * 2002-03-07 2003-06-18 Voith Paper Patent Gmbh Verfahren zur Reduzierung und Einstellung des Gehaltes von feinen Feststoffen in einer Papierfasersuspension
DE102004051327B4 (de) * 2004-10-21 2007-09-27 Voith Patent Gmbh Verfahren zur Entgasung und Zuführung einer Faserstoffsuspension zu einem Stoffauflauf sowie Entgasungsvorrichtung
AT501868B1 (de) * 2005-06-13 2007-04-15 Andritz Ag Maschf Verfahren zur wiederverwertung von füllstoffen und streichpigmenten der papier-, pappe- oder kartonherstellung
DE102005061302B3 (de) * 2005-12-21 2007-06-21 Meri Entsorgungstechnik für die Papierindustrie GmbH Anlage und Verfahren mit Prozesswasseraufbereitung zur Herstellung von Papier aus Altpapier
DE102006034186A1 (de) * 2006-07-24 2008-01-31 Siemens Ag Einrichtung zur Papierherstellung, insbesondere Altpapier
DE102006057861A1 (de) * 2006-12-08 2008-06-12 Voith Patent Gmbh Verfahren zur Behandlung von beim Eindicken von Papierfasersuspension anfallendem Filtrat
DE102011005650A1 (de) 2011-03-16 2012-09-20 Voith Patent Gmbh Verfahren zur Regelung der Filterleistung einer Filtervorrichtung
DE102013105111A1 (de) 2013-05-17 2014-11-20 Servophil AG Verfahren zur Ablagerungsvermeidung in Papiermaschinensystemen
CN103726387B (zh) * 2014-01-11 2016-05-18 金东纸业（江苏）股份有限公司 纸机节水系统与方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3559342A1 (fr) 2019-10-30
WO2018114153A1 (fr) 2018-06-28
CN109983175B (zh) 2021-03-09
CN109983175A (zh) 2019-07-05
DE102016125303A1 (de) 2018-06-28
DE102016125303B4 (de) 2018-12-27

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