EP3559342A1 - System for process water treatment - Google Patents

System for process water treatment

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Publication number
EP3559342A1
EP3559342A1 EP17801678.8A EP17801678A EP3559342A1 EP 3559342 A1 EP3559342 A1 EP 3559342A1 EP 17801678 A EP17801678 A EP 17801678A EP 3559342 A1 EP3559342 A1 EP 3559342A1
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EP
European Patent Office
Prior art keywords
machine
process water
sorting
washing device
flotation
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
EP17801678.8A
Other languages
German (de)
French (fr)
Other versions
EP3559342B1 (en
Inventor
Christoph Strempfl
Eckhard Gutsmuths
Falk Albrecht
Christoph Adams
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP3559342A1 publication Critical patent/EP3559342A1/en
Application granted granted Critical
Publication of EP3559342B1 publication Critical patent/EP3559342B1/en
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 plant for the treatment of process water of a machine for producing and / or finishing a paper, board, tissue or another fibrous web, wherein the process water in a sorting or filtering device divided into several sub-fractions with different levels of fibers becomes.
  • the invention also relates to a method for operating this system.
  • Such systems are described for example in DE 10 2013 105 1 1 1 A1, DE 699 15 227 T2, DE 10 2006 034 186 A1 and DE 10 201 1 005 650 A1.
  • paper fiber suspensions as used to make a fibrous web, contain not only the actual paper fibers but also a more or less large amount of fine solids.
  • Such fine solids can be mineral fillers that are usually needed for paper production. They are usually called "ashes" because the mineral fillers are non-combustible, but they can also be fiber fragments, such as those found during the grinding of the fibers, which are also called fines.
  • the consistency of the paper fiber suspension in the stock preparation of a paper machine is to be increased, it is thickened. Not only part of the water, but also a part of the fine solids pass into the filtrate, which is why the filtrate usually consists of water, fillers and fillers.
  • this filtrate is used where at an upstream location for technical process reasons, the pulp suspension must be diluted. Although the fine solids are not lost in this way, it is possible that the accumulation of fines and fillers in the filtrates is relatively large. Therefore, this convenient method of filtrate recycling can lead to disruptions in the process flow.
  • a possible remedy to avoid such disturbances is to remove the fine and fillers from the circulation. So it is e.g. It is possible to adjust an existing flotation plant so that it entascht the material much more than is necessary for the paper later produced from the fiber itself. But then increase the loss of material, the yield decreases.
  • the object of the invention is therefore in particular to reduce the proportion of fillers in the fibrous web with the least possible effort and fiber losses as needed.
  • this object is achieved in that at least two partial fractions are led at least partially over at least a predetermined period of time to a common washing device, the fine fraction of this washing device to a flotation and the Accept this flotation of the machine, another machine for producing a fibrous web or an upstream Process for treating a pulp suspension is fed.
  • the plant is particularly suitable for treating the process waters heavily loaded with fibers, fillers and fillers from the former of the machine for sheet formation. These process waters can be at least partially supplied to the sorting or filtering device.
  • the partial fractions of the sorting or filtering device generally have a high proportion of fillers and fillers, which is above that of the used waste paper and the paper produced.
  • a partial fraction with a higher fiber content preferably the partial flow of the sorting or filtering device with the highest fiber content is diluted with a likewise filler-containing, preferably high filler-containing fraction of the sorting or filtering device and fed to the washing device. While the coarse fraction of this high fiber fiber washing apparatus is recycled to the machine cycle or an upstream pulp suspension treatment process, the high fraction, but low fiber content, fine fraction of the washer arrives at the flotation apparatus.
  • the washing device may also be supplied with chemicals or other process water from the machine or an upstream process for treating a pulp suspension to dilute the high fiber portion stream.
  • the white water of the paper machine is suitable.
  • the sorting or filtering device is advantageously designed as a disc filter.
  • Disc filters have long been known and serve to separate liquids from a suspension.
  • the part streams of the disc filter As a fiber filtrate (also called catch), turbid filtrate, clear filtrate and super clear filtrate.
  • 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 guided there together through the press nip, process waters from the press section contain not only the fibers, fillers and fillers but also felt hairs. In general, the process water from the press section can at least partially be conducted directly to the washing device or to the flotation device.
  • the process water of the press section is previously passed through another sorting device, for example a very fine sorter or a curved screen.
  • a pulp suspension is produced by mechanically and possibly chemically processing the paper material in the form of waste paper with water in a dissolution in such a way that a pumpable pulp suspension is formed.
  • the subsequent first purification may e.g. be provided with pressure sorters and hydrocyclones in order to eliminate the coarse impurities as early as possible.
  • the purified pulp suspension passes directly successively 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.
  • 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 (eg 15 to 30%) and enters the pulp processing, in which one or more process steps are carried out requiring this higher consistency do.
  • This may, for example, usually be a dispersion with or without bleaching, for which purpose the auxiliaries are supplied in the form of energy and / or the chemicals.
  • the fabric After the high-consistency treatment, the fabric is diluted again. Finally, the finished pulp suspension is provided in a stock for processing on the paper or board machine.
  • the paper or board machine is only hinted at here.
  • Part of the white water obtained there can be used as dilution water in stock preparation, e.g. to provide part of the water for dissolution, or to make additional dilution elsewhere.
  • the waste water 16 of the former 7 of the machine, in which the sheet is formed 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 chest 5.
  • the wastewater is then divided into several sub-fractions 9, 10, which are generally referred to as fiber filtrate, cloudy filtrate, clear filtrate or super clear filtrate.
  • Shown in the figure is the division into a sub-fraction 9 with a high fiber content, which corresponds to the fiber filtrate and into another sub-fraction 10 with a low fiber content.
  • Both partial fractions 9, 10 still contain a great deal of fines and fillers, ie ashes.
  • the proportion of ash is therefore at least a portion of the fraction 9 fraction with a high fiber content, the other fraction 10 with low fiber content and, if necessary, even process water from the white water 5 led to a washing device 2.
  • a washing device 2 In this washing device 2, a high concentration of fines and fillers in their fine fraction 12 can also be achieved due to the low consistency.
  • the coarse fraction 1 1 of the washing device 2 contains a high fiber content and a relatively small proportion of fillers and fillers and can therefore be used without problems in the stock preparation or in the constant part of the machine. Therefore, a return of the coarse fraction 1 1 of the washing device 2 in a fabric chest 6, optionally via a buffer chest 18th
  • washing device 2 As a washing device 2 are known oblique screens, curved screens, drum thickener, etc.
  • the fine and filler-rich fine fraction 12 of the washing device 2 passes 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 Druckentpressivesflotations device.
  • the accept 15 of the flotation device 3 can be supplied as dilution water to the paper machine or the preceding stock preparation, here the white water chest 5.
  • micro stickies can also be deposited in the reject 17 via this flotation device 3.
  • the press section 8 is used for dewatering the fibrous web, which is done for this purpose together with press felts through one or more roll press nips. Therefore, the process water 13 of the press section 8 also has a considerable proportion of felt hair, which are removed before being fed to the flotation device 3 and / or the washing device 2 by means of a sorting device 4.
  • the plant unit with the washing device 2 and the flotation device 3 can be constantly in operation for the discharge of ash from the process. However, it can be switched on to increase the strength of the fibrous web in particular only at low basis weights of the fibrous web. It is also possible, via the proportion of, the washing device 2 supplied partial fractions 9,10 of the sorting or filtering device 1 to change the scope of, deposited from the process amount of fines and fillers.

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Abstract

The invention relates to a system for the treatment of process water of a machine for producing and/or finishing a paper web, cardboard web, tissue web or another fibrous web, wherein the process water is divided in a sorting or filtering device (1) into a plurality of part fractions (9, 10) with different proportions of fibres. Here, the quality of the process water is to be improved by virtue of the fact that at least two part fractions (9, 10) are conducted at least partially over at least one predefined time period to a common washing device (2), the fine fraction (12) of said washing device (2) is guided to a flotation device (3), and the accepted stock (15) of said flotation device (3) is fed to the machine or an upstream process for the treatment of a fibrous stock suspension.

Description

Anlage zur Prozesswasserbehandlung  Plant for process water treatment
Die Erfindung betrifft eine Anlage zur Behandlung von Prozesswasser einer Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn, wobei das Prozesswasser in einer Sortier- oder Filtervorrichtung in mehrere Teilfraktionen mit unterschiedlich hohen Anteilen an Fasern aufgeteilt wird. The invention relates to a plant for the treatment of process water of a machine for producing and / or finishing a paper, board, tissue or another fibrous web, wherein the process water in a sorting or filtering device divided into several sub-fractions with different levels of fibers becomes.
Die Erfindung betrifft ebenso ein Verfahren zum Betrieb dieser Anlage. Derartige Anlagen sind beispielsweise in der DE 10 2013 105 1 1 1 A1 , der DE 699 15 227 T2, der DE 10 2006 034 186 A1 sowie der DE 10 201 1 005 650 A1 beschrieben.  The invention also relates to a method for operating this system. Such systems are described for example in DE 10 2013 105 1 1 1 A1, DE 699 15 227 T2, DE 10 2006 034 186 A1 and DE 10 201 1 005 650 A1.
Bekanntlich enthalten Papierfasersuspensionen, wie sie zur Herstellung einer Faserstoffbahn verwendet werden, nicht nur die eigentlichen Papierfasern, sondern auch eine mehr oder weniger große Menge von feinen Feststoffen.  As is known, paper fiber suspensions, as used to make a fibrous web, contain not only the actual paper fibers but also a more or less large amount of fine solids.
Solche feinen Feststoffe können mineralische Füllstoffe sein, die in der Regel zur Papiererzeugung nötig sind. Man nennt sie zumeist„Asche", da die mineralischen Füllstoffe unbrennbar sind. Es können aber auch Faserbruchstücke sein, die z.B. bei der Mahlung der Fasern entstehen. Diese werden auch Feinstoffe genannt.  Such fine solids can be mineral fillers that are usually needed for paper production. They are usually called "ashes" because the mineral fillers are non-combustible, but they can also be fiber fragments, such as those found during the grinding of the fibers, which are also called fines.
Wenn aus prozesstechnischen Gründen die Konsistenz der Papierfasersuspension in der Stoffaufbereitung einer Papiermaschine erhöht werden soll, wird sie eingedickt. Dabei gehen nicht nur ein Teil des Wassers, sondern auch ein Teil der feinen Feststoffe in das Filtrat über, weshalb also in der Regel sich das Filtrat aus Wasser, Fein- und Füllstoffen zusammensetzt. If, for process engineering reasons, the consistency of the paper fiber suspension in the stock preparation of a paper machine is to be increased, it is thickened. Not only part of the water, but also a part of the fine solids pass into the filtrate, which is why the filtrate usually consists of water, fillers and fillers.
Bei der üblichen Prozessführung wird dieses Filtrat dort verwendet, wo an einer stromaufwärts gelegenen Stelle aus prozesstechnischen Gründen die Faserstoffsuspension verdünnt werden muss. Auf diese Weise gehen die feinen Feststoffe zwar nicht verloren, es ist jedoch möglich, dass die Anreicherung von Fein- und Füllstoffen in den Filtraten relativ groß wird. Daher kann diese an sich günstige Methode der Filtratrückführung zu Störungen im Prozessablauf führen. Gleiches gilt für die Prozesswässer der Maschine, welche überwiegend im Former zur Blattbildung und in der Pressenpartie zur Entwässerung der Faserstoffbahn anfallen und in der Maschine oder der vorgelagerten Stoffaufbereitung wiederverwendet werden. Auch hier kann es insbesondere bei einem hohen Anteil von Altpapier zu einer erheblichen Anreicherung von Fein- und Füllstoffen kommen, was sich negativ auf die Festigkeit der Faserstoffbahn auswirkt. In the usual process, this filtrate is used where at an upstream location for technical process reasons, the pulp suspension must be diluted. Although the fine solids are not lost in this way, it is possible that the accumulation of fines and fillers in the filtrates is relatively large. Therefore, this convenient method of filtrate recycling can lead to disruptions in the process flow. The same applies to the process waters of the machine, which occur predominantly in the former for sheet formation and in the press section for dewatering the fibrous web and are reused in the machine or the upstream stock preparation. Again, there may be a significant accumulation of fines and fillers, especially with a high proportion of waste paper, which has a negative effect on the strength of the fibrous web.
Eine mögliche Abhilfe, um solche Störungen zu vermeiden, liegt darin, die Fein- und Füllstoffe aus dem Kreislauf zu entfernen. So ist es z.B. möglich, eine vorhandene Flotationsanlage so einzustellen, dass sie den Stoff wesentlich stärker entascht als es für das aus der Faser später hergestellte Papier an sich erforderlich ist. Dann steigen aber die Stoffverluste an, die Ausbeute sinkt. Die Aufgabe der Erfindung ist es daher insbesondere den Anteil von Füllstoffen in der Faserstoffbahn mit möglichst geringem Aufwand und Faserverlusten bei Bedarf zu senken.  A possible remedy to avoid such disturbances is to remove the fine and fillers from the circulation. So it is e.g. It is possible to adjust an existing flotation plant so that it entascht the material much more than is necessary for the paper later produced from the fiber itself. But then increase the loss of material, the yield decreases. The object of the invention is therefore in particular to reduce the proportion of fillers in the fibrous web with the least possible effort and fiber losses as needed.
Erfindungsgemäß wurde die Aufgabe dadurch gelöst, dass zumindest zwei Teilfraktionen wenigstens teilweise über mindestens eine vorgegebene Zeitspanne zu einer gemeinsamen Waschvorrichtung geführt werden, die Feinfraktion dieser Waschvorrichtung zu einer Flotationsvorrichtung und das Accept dieser Flotationsvorrichtung der Maschine, einer anderen Maschine zur Herstellung einer Faserstoffbahn oder einem vorgelagerten Prozess zur Behandlung einer Faserstoffsuspension zugeleitet wird. According to the invention, this object is achieved in that at least two partial fractions are led at least partially over at least a predetermined period of time to a common washing device, the fine fraction of this washing device to a flotation and the Accept this flotation of the machine, another machine for producing a fibrous web or an upstream Process for treating a pulp suspension is fed.
Besonders eignet sich die Anlage zur Behandlung der stark mit Fasern, Fein- und Füllstoffen belasteten Prozesswässer aus dem Former der Maschine zur Blattbildung. Diese Prozesswässer können der Sortier- oder Filtervorrichtung zumindest teilweise zugeführt werden. The plant is particularly suitable for treating the process waters heavily loaded with fibers, fillers and fillers from the former of the machine for sheet formation. These process waters can be at least partially supplied to the sorting or filtering device.
Die Teilfraktionen der Sortier- oder Filtervorrichtung weisen in der Regel einen hohen Anteil an Fein- und Füllstoffen auf, der über dem des eingesetzten Altpapiers und des hergestellten Papiers liegt. The partial fractions of the sorting or filtering device generally have a high proportion of fillers and fillers, which is above that of the used waste paper and the paper produced.
Daher wird eine Teilfraktion mit höherem Faseranteil, vorzugsweise der Teilstrom der Sortier- oder Filtervorrichtung mit dem höchsten Faseranteil mit einer ebenfalls füllstoffhaltigen, vorzugsweise hochfüllstoffhaltigen Teilfraktion der Sortier- oder Filtervorrichtung verdünnt und zur Waschvorrichtung geführt wird. Während die Grobfraktion dieser Waschvorrichtung mit einem hohen Faseranteil in den Stoffkreislauf der Maschine oder einem vorgelagerten Prozess zur Behandlung einer Faserstoffsuspension zurückgeführt wird, gelangt die Feinfraktion der Waschvorrichtung mit hohem Füllstoffgehalt, aber geringem Fasergehalt zur Flotationsvorrichtung. Therefore, a partial fraction with a higher fiber content, preferably the partial flow of the sorting or filtering device with the highest fiber content is diluted with a likewise filler-containing, preferably high filler-containing fraction of the sorting or filtering device and fed to the washing device. While the coarse fraction of this high fiber fiber washing apparatus is recycled to the machine cycle or an upstream pulp suspension treatment process, the high fraction, but low fiber content, fine fraction of the washer arrives at the flotation apparatus.
In dieser Flotationsvorrichtung können so die Fein- und Füllstoffe sowie Stickies ohne großen Faserverlust abgeschieden und anschließend verworfen oder aber wiederverwendet werden. Bei Bedarf können der Waschvorrichtung zusätzlich auch Chemikalien oder anderes Prozesswasser der Maschine oder eines vorgelagerten Prozesses zur Behandlung einer Faserstoffsuspension zur Verdünnung des Teilstroms mit hohem Faseranteil zugeleitet werden. Hierfür eignet sich beispielsweise auch das Siebwasser der Papiermaschine.  In this flotation so the fine and fillers and stickies can be deposited without much fiber loss and then discarded or reused. If desired, the washing device may also be supplied with chemicals or other process water from the machine or an upstream process for treating a pulp suspension to dilute the high fiber portion stream. For this purpose, for example, the white water of the paper machine is suitable.
Die Sortier- oder Filtervorrichtung ist dabei mit Vorteil als Scheibenfilter ausgebildet. Scheibenfilter sind seit langem bekannt und dienen zur Abtrennung von Flüssigkeiten aus einer Suspension. The sorting or filtering device is advantageously designed as a disc filter. Disc filters have long been known and serve to separate liquids from a suspension.
Entsprechend ihrem Anteil an Fasern, Füll- und Feinstoffen bezeichnet man die Teilströme des Scheibenfilters als Faserfiltrat(auch Fangstoff genannt), Trübfiltrat, Klarfiltrat und Superklarfiltrat.  According to their proportion of fibers, fillers and fines called the part streams of the disc filter as a fiber filtrate (also called catch), turbid filtrate, clear filtrate and super clear filtrate.
Für die Abtrennung der Füllstoffe eignet sich als Flotationsvorrichtung insbesondere eine Druckentspannungsflotations-Vorrichtung. For the separation of the fillers is suitable as a flotation in particular a Druckentspannungsflotations device.
Bei der Entspannungsflotation wird das Prozesswasser bei einem Überdruck mit Luft gesättigt und dann in ein Flotationsbecken geleitet. Nach der Entspannung perlt die überschüssige Luft in Form feiner Blasen aus. Die Gasblasen binden die Fein- und Füllstoffe und tragen sie an die Oberfläche des Flotationsbeckens, wo sie abgeräumt werden können. In flotation flotation, the process water is saturated with air at an overpressure and then passed into a flotation tank. After relaxation, the excess air bubbles out in the form of fine bubbles. The gas bubbles bind the fines and fillers and carry them to the surface of the flotation basin, where they can be cleared.
Maschinen zur Herstellung einer Faserstoffbahn weisen im Allgemeinen auch eine Pressenpartie zur Entwässerung der Faserstoffbahn auf. Wegen des Kontakts mit den dort gemeinsam durch die Pressspalte geführten Pressfilzen beinhalten Prozesswässer aus der Pressenpartie neben den Fasern, Fein- und Füllstoffen auch Filzhaare. Generell kann das Prozesswasser aus der Pressenpartie zumindest teilweise direkt zur Waschvorrichtung oder zur Flotationsvorrichtung geleitet werden. 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 guided there together through the press nip, process waters from the press section contain not only the fibers, fillers and fillers but also felt hairs. In general, the process water from the press section can at least partially be conducted directly to the washing device or to the flotation device.
Insbesondere zur Abtrennung der Filzhaare kann es aber vorteilhaft sein, wenn das Prozesswasser der Pressenpartie vorher noch über eine andere Sortiervorrichtung, beispielsweise einen Feinst-Sortierer oder ein Bogensieb geführt wird. In particular, for the separation of the felt hair, however, it may be advantageous if the process water of the press section is previously passed through another sorting device, for example a very fine sorter or a curved screen.
Bei durchgehendem Betrieb kann so der Anreicherung von Fein- und Füllstoffen wirksam begegnet werden. In continuous operation so the accumulation of fines and fillers can be effectively countered.
Es ist aber auch möglich die Teilfraktionen der Sortier- oder Filtervorrichtung nur über bestimmte Zeiträume zur Senkung des durchschnittlichen Füllstoffgehaltes des in der Maschine wiederverwendeten Prozesswassers zur Waschvorrichtung zu leiten. But it is also possible to direct the fractional parts of the sorting or filtering device only for certain periods of time to reduce the average filler content of the reused in the machine process water to the washing device.
Ebenso ist es möglich über die Menge der zur Waschvorrichtung geführten Teilfraktionen die Menge des Füllstoffgehaltes in der Faserstoffbahn zu steuern bzw. zu steuern. Nachfolgend soll die Erfindung anhand eines Ausführungsbeispiels näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur ein Anlagenschema zur Abwasserbehandlung. It is likewise possible to control or control the amount of filler content in the fibrous web via the amount of fractional fractions fed to the washing device. The invention will be explained in more detail with reference to an embodiment. In the accompanying drawing, the figure shows a plant scheme for wastewater treatment.
Wie an sich bekannt, wird eine Faserstoffsuspension dadurch hergestellt, dass das Papiermaterial zunehmend in Form von Altpapier mit Wasser in einer Auflösung mechanisch und eventuell chemisch so bearbeitet wird, dass eine pumpfähige Faserstoffsuspension entsteht. Die sich anschließende erste Reinigung kann z.B. mit Drucksortierern und Hydrozyklonen versehen sein, um die groben Verunreinigungen möglichst früh auszuscheiden. As is known per se, a pulp suspension is produced by mechanically and possibly chemically processing the paper material in the form of waste paper with water in a dissolution in such a way that a pumpable pulp suspension is formed. The subsequent first purification may e.g. be provided with pressure sorters and hydrocyclones in order to eliminate the coarse impurities as early as possible.
Die gereinigte Faserstoffsuspension gelangt direkt nacheinander in die stromaufwärtige Eindickung, welche vorzugsweise mit einer Filtervorrichtung, beispielsweise mit einer Siebpresse, einem Scheibenfilter oder einer Schneckenpresse durchgeführt. The purified pulp suspension passes directly successively 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.
Nach der Eindickung hat der Faserstoff eine wesentlich höhere Konsistenz (z.B. 15 bis 30 %) und gelangt in die Stoffbearbeitung, in der ein oder mehrere Prozessschritte durchgeführt werden, die diese höhere Konsistenz erforderlich machen. Das kann z.B. üblicherweise eine Dispergierung mit oder ohne Bleiche sein, wozu die Hilfsmittel in Form von Energie und/oder der Chemikalien zugeführt werden. Nach der Hochkonsistenzbehandlung wird der Stoff wieder verdünnt. Am Ende wird die fertige Faserstoffsuspension in einer Stoffvorlage für die Verarbeitung auf der Papier- oder Kartonmaschine bereitgestellt. After thickening, the pulp has a much higher consistency (eg 15 to 30%) and enters the pulp processing, in which one or more process steps are carried out requiring this higher consistency do. This may, for example, usually be a dispersion with or without bleaching, for which purpose the auxiliaries are supplied in the form of energy and / or the chemicals. After the high-consistency treatment, the fabric is diluted again. Finally, the finished pulp suspension is provided in a stock for processing on the paper or board machine.
Die Papier- oder Kartonmaschine ist hier nur angedeutet. Ein Teil des dort anfallenden Siebwassers kann als Verdünnungswasser in der Stoffaufbereitung genutzt werden, z.B. um einen Teil des Wassers für die Auflösung bereit zu stellen oder auch um eine zusätzliche Verdünnung an anderer Stelle vorzunehmen. The paper or board machine is only hinted at here. Part of the white water obtained there can be used as dilution water in stock preparation, e.g. to provide part of the water for dissolution, or to make additional dilution elsewhere.
Um zu verhindern, dass mit Hilfe dieses Verdünnungswassers ein Teil der Aschefracht aus der Papiermaschine in die Stoffaufbereitung zurückgelangt, kann man ein späteres Siebwasser mit geringerem Ascheanteil, also beispielsweise Siebwasser oder Pressenwasser, dazu verwenden.  In order to prevent that with the help of this dilution water, a part of the ash load from the paper machine gets back into the stock preparation, you can use a later white water with a lower ash content, so for example white water or press water to do so.
Häufig ist der Anteil an Füll- und Feinstoffen aber selbst bei diesen Prozesswässern so hoch, dass eine Entaschung erforderlich ist.  Frequently, however, the proportion of fillers and fines is so high even with these process waters that deashing is necessary.
Gemäß der Figur wird hierzu das Abwasser 16 des Formers 7 der Maschine, in welchem die Blattbildung erfolgt, zumindest teilweise in eine Sortier- und Filtervorrichtung 1 in Form eines Scheibenfilters gefördert. Der andere Teil des Prozesswassers 16 des Formers kann einer Siebwasser-Bütte 5 zugeführt werden. According to the figure, for this purpose, the waste water 16 of the former 7 of the machine, in which the sheet is formed, 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 chest 5.
Im Scheibenfilter wird das Abwasser dann in mehrere Teilfraktionen 9, 10 aufgeteilt, welche man im Allgemeinen als Faserfiltrat, Trübfiltrat, Klarfiltrat oder Superklarfiltrat bezeichnet. In the disc filter, the wastewater is then divided into several sub-fractions 9, 10, which are generally referred to as fiber filtrate, cloudy filtrate, clear filtrate or super clear filtrate.
Gezeigt ist in der Figur die Aufteilung in eine Teilfraktion 9 mit einem hohen Faseranteil, was dem Faserfiltrat entspricht und in eine andere Teilfraktion 10 mit geringem Faseranteil.  Shown in the figure is the division into a sub-fraction 9 with a high fiber content, which corresponds to the fiber filtrate and into another sub-fraction 10 with a low fiber content.
Beide Teilfraktionen 9, 10 beinhalten noch sehr viel Fein- und Füllstoffe, also Asche. Um den Aschanteil zu vermindern wird daher zumindest ein Teil der Teilfraktion 9 mit einem hohen Faseranteil, die andere Teilfraktion 10 mit geringem Faseranteil und bei Bedarf auch noch Prozesswasser aus der Siebwasser-Bütte 5 zu einer Waschvorrichtung 2 geführt. ln dieser Waschvorrichtung 2 kann auch auf Grund der geringen Stoffdichte eine hohe Konzentration der Fein- und Füllstoffe in deren Feinfraktion 12 erreicht werden. Both partial fractions 9, 10 still contain a great deal of fines and fillers, ie ashes. In order to reduce the proportion of ash is therefore at least a portion of the fraction 9 fraction with a high fiber content, the other fraction 10 with low fiber content and, if necessary, even process water from the white water 5 led to a washing device 2. In this washing device 2, a high concentration of fines and fillers in their fine fraction 12 can also be achieved due to the low consistency.
Die Grobfraktion 1 1 der Waschvorrichtung 2 enthält einen hohen Faseranteil und einen relativ geringen Anteil an Fein- und Füllstoffen und kann daher problemlos bei der Stoffaufbereitung bzw. im Konstantteil der Maschine eingesetzt werden. Daher erfolgt eine Rückführung der Grobfraktion 1 1 der Waschvorrichtung 2 in eine Stoff-Bütte 6, gegebenenfalls über eine Puffer-Bütte 18.  The coarse fraction 1 1 of the washing device 2 contains a high fiber content and a relatively small proportion of fillers and fillers and can therefore be used without problems in the stock preparation or in the constant part of the machine. Therefore, a return of the coarse fraction 1 1 of the washing device 2 in a fabric chest 6, optionally via a buffer chest 18th
Als Waschvorrichtung 2 eignen sich bekannte Schrägsiebe, Bogensiebe, Trommeleindicker usw. As a washing device 2 are known oblique screens, curved screens, drum thickener, etc.
Die fein- und füllstoffreiche Feinfraktion 12 der Waschvorrichtung 2 gelangt hier beispielhaft gemeinsam mit Chemikalien 14 für die Stoffaufbereitung und Prozesswasser 13 aus der Pressenpartie 8 der Papiermaschine in eine Flotationsvorrichtung 3 in Form einer Druckentspannungsflotations-Vorrichtung. The fine and filler-rich fine fraction 12 of the washing device 2 passes 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 Druckentspannungsflotations device.
Während das Rejekt 17 dieser Flotationsvorrichtung 3 verworfen oder in der oder einer anderen Maschine zur Herstellung einer Fasserstoffbahn wiederverwendet wird, kann das Accept 15 der Flotationsvorrichtung 3 als Verdünnungswasser der Papiermaschine oder der vorgelagerten Stoffaufbereitung, hier der Siebwasser- Bütte 5 zugeführt werden. While the reject 17 of this flotation device 3 is discarded or reused in the or another machine for producing a hydrogen material web, the accept 15 of the flotation device 3 can be supplied as dilution water to the paper machine or the preceding stock preparation, here the white water chest 5.
Neben Fein- und Füllstoffen können über diese Flotationsvorrichtung 3 auch Mikrostickies im Rejekt 17 abgeschieden werden. Die Pressenpartie 8 dient zur Entwässerung der Faserstoffbahn, welche hierzu gemeinsam mit Pressfilzen durch einen oder mehrere Walzen-Pressspalte geführt wird. Daher weist das Prozesswasser 13 der Pressenpartie 8 auch einen erheblichen Anteil an Filzhaaren auf, welche vor Zuführung in die Flotationsvorrichtung 3 und/oder die Waschvorrichtung 2 mittels einer Sortiervorrichtung 4 entfernt werden.  In addition to fines and fillers, micro stickies can also be deposited in the reject 17 via this flotation device 3. The press section 8 is used for dewatering the fibrous web, which is done for this purpose together with press felts through one or more roll press nips. Therefore, the process water 13 of the press section 8 also has a considerable proportion of felt hair, which are removed before being fed to the flotation device 3 and / or the washing device 2 by means of a sorting device 4.
Die Anlageneinheit mit der Waschvorrichtung 2 und der Flotationsvorrichtung 3 kann zur Ausschleusung von Asche aus dem Prozess ständig in Betrieb sein. Sie kann aber zur Steigerung der Festigkeit der Faserstoffbahn insbesondere nur bei geringen Flächengewichten der Faserstoffbahn zugeschaltet werden. Es ist außerdem möglich, über den Anteil der, der Waschvorrichtung 2 zugeführten Teilfraktionen 9,10 der Sortier- oder Filtervorrichtung 1 den Umfang der, aus dem Prozess abgeschiedenen Menge an Fein- und Füllstoffen zu verändern. The plant unit with the washing device 2 and the flotation device 3 can be constantly in operation for the discharge of ash from the process. However, it can be switched on to increase the strength of the fibrous web in particular only at low basis weights of the fibrous web. It is also possible, via the proportion of, the washing device 2 supplied partial fractions 9,10 of the sorting or filtering device 1 to change the scope of, deposited from the process amount of fines and fillers.
Je mehr Asche ausgeschleust wird umso geringer ist letztendlich der Anteil von Fein- und Füllstoffen in der Faserstoffbahn, so dass dies über diese Anlageneinheit steuerbar bzw. regelbar ist. The more ash is discharged, the smaller is ultimately the proportion of fillers and fillers in the fibrous web, so that this can be controlled or regulated via this system unit.

Claims

Patentansprüche claims
1 . Anlage zur Behandlung von Prozesswasser einer Maschine zur Herstellung und/oder Veredlung einer Papier-, Karton-, Tissue- oder einer anderen Faserstoffbahn, wobei das Prozesswasser in einer Sortier- oder Filtervorrichtung1 . Plant for the treatment of process water of a machine for the production and / or finishing of a paper, board, tissue or another fibrous web, wherein the process water in a sorting or filtering device
(I ) in mehrere Teilfraktionen (9,10) mit unterschiedlich hohen Anteilen an Fasern aufgeteilt wird, dadurch gekennzeichnet, dass zumindest zwei Teilfraktionen (9,10) wenigstens teilweise über mindestens eine vorgegebene Zeitspanne zu einer gemeinsamen Waschvorrichtung (2) geführt werden, die Feinfraktion (12) dieser Waschvorrichtung (2) zu einer Flotationsvorrichtung (3) und das Accept (15) dieser Flotationsvorrichtung (3) der Maschine, einer anderen Maschine zur Herstellung einer Faserstoffbahn oder einem vorgelagerten Prozess zur Behandlung einer Faserstoffsuspension zugeleitet wird. (I) into several sub-fractions (9,10) is divided with different proportions of fibers, characterized in that at least two sub-fractions (9,10) at least partially over at least a predetermined period of time to a common washing device (2) are performed Fine fraction (12) of this washing device (2) to a flotation device (3) and the Accept (15) of this flotation device (3) of the machine, another machine for producing a fibrous web or an upstream process for the treatment of a pulp suspension is fed.
2. Anlage nach Anspruch 1 , dadurch gekennzeichnet, dass die Grobfraktion2. Plant according to claim 1, characterized in that the coarse fraction
(I I ) der Waschvorrichtung (2) in den Stoffkreislauf der Maschine oder einem vorgelagerten Prozess zur Behandlung einer Faserstoffsuspension zurückgeführt wird. (I I) of the washing device (2) in the material cycle of the machine or an upstream process for the treatment of a pulp suspension is returned.
3. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der3. Plant according to claim 1 or 2, characterized in that the
Waschvorrichtung (2) auch anderes Prozesswasser der Maschine oder eines vorgelagerten Prozesses zur Behandlung einer Faserstoffsuspension zugeleitet wird. Washing device (2) also other process water of the machine or an upstream process for the treatment of a pulp suspension is fed.
4. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Teilfraktion (9) der Sortier- oder Filtervorrichtung (1 ) mit dem höchsten Faseranteil zur Waschvorrichtung (2) geführt wird. 4. Plant according to one of the preceding claims, characterized in that the partial fraction (9) of the sorting or filtering device (1) with the highest fiber content to the washing device (2) is guided.
5. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Flotationsvorrichtung (3) als5. Plant according to one of the preceding claims, characterized in that the flotation device (3) as
Druckentspannungsflotations-Vorrichtung ausgeführt ist. Pressure relief flotation device is executed.
6. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Sortier- oder Filtervorrichtung (1 ) als Scheibenfilter ausgebildet ist. 6. Installation according to one of the preceding claims, characterized in that the sorting or filtering device (1) is designed as a disc filter.
7. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Maschine einen Former (7) zur Blattbildung aufweist und dessen Prozesswasser (16) zumindest teilweise zur Sortier- oder Filtervorrichtung (1 ) geführt wird. 7. Installation according to one of the preceding claims, characterized in that the machine has a former (7) for sheet formation and the process water (16) at least partially to the sorting or filtering device (1) is guided.
8. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Maschine eine Pressenpartie (8) zur Entwässerung der Faserstoffbahn besitzt und deren Prozesswasser (13) wenigstens teilweise zur Waschvorrichtung (2) und/oder zur Flotationsvorrichtung (3) geleitet wird. 8. Installation according to one of the preceding claims, characterized in that the machine has a press section (8) for dewatering the fibrous web and the process water (13) at least partially to the washing device (2) and / or flotation device (3) is passed.
9. Anlage nach Anspruch 8, dadurch gekennzeichnet, dass das Prozesswasser (13) der Pressenpartie (8) vor der Waschvorrichtung (2) oder der Flotationsvorrichtung (3) über eine Sortiervorrichtung (4) geführt wird. 9. Plant according to claim 8, characterized in that the process water (13) of the press section (8) before the washing device (2) or the flotation device (3) via a sorting device (4) is guided.
10. Verfahren zu Betrieb einer Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Teilfraktionen (9,10) der Sortieroder Filtervorrichtung (1 ) nur über bestimmte Zeiträume zur Senkung des durchschnittlichen Füllstoffgehaltes des in der Maschine wiederverwendeten Prozesswassers zur Waschvorrichtung (2) geleitet werden. 10. A process for operating a plant according to one of the preceding claims, characterized in that the fractional fractions (9,10) of the sorting or filtering device (1) only for certain periods to reduce the average filler content of the reused in the machine process water to the washing device (2). be directed.
EP17801678.8A 2016-12-22 2017-11-16 System for process water treatment Not-in-force EP3559342B1 (en)

Applications Claiming Priority (2)

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DE102016125303.0A DE102016125303B4 (en) 2016-12-22 2016-12-22 Plant for process water treatment
PCT/EP2017/079411 WO2018114153A1 (en) 2016-12-22 2017-11-16 System for process water treatment

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EP3559342B1 EP3559342B1 (en) 2020-12-30

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DE4238336A1 (en) * 1992-11-13 1994-05-19 Voith Gmbh J M Used paper suspension cleaning process and appts. - has thickener or washer for sludge from flotation unit to be returned to the flotation stage
FI111466B (en) 1998-11-20 2003-07-31 Andritz Oy Method and apparatus for treating rejection pulp
DE19914779A1 (en) * 1999-03-31 2000-10-05 Meri Entsorgungstech Papierind Papermaking machine waste water processing system has an initial spray filtration stage to recover a fiber fraction for return and use and a flotation separation stage for the fine matter fraction
DE10218265C1 (en) * 2002-03-07 2003-06-18 Voith Paper Patent Gmbh Controlling fines concentration in waste paper suspensions, separates two streams from washer for direct return and adjustment of fines content
DE102004051327B4 (en) * 2004-10-21 2007-09-27 Voith Patent Gmbh Method for degassing and feeding a pulp suspension to a headbox and degassing
AT501868B1 (en) * 2005-06-13 2007-04-15 Andritz Ag Maschf METHOD FOR THE RECYCLING OF FILLERS AND PIGMENTS OF PAPER, PAPER OR CARTON MANUFACTURING
DE102005061302B3 (en) * 2005-12-21 2007-06-21 Meri Entsorgungstechnik für die Papierindustrie GmbH Paper production unit comprises a treatment unit connected to a paper machine, and a cleansing and/or material recovery unit
DE102006034186A1 (en) 2006-07-24 2008-01-31 Siemens Ag Equipment for papermaking, especially waste paper
DE102006057861A1 (en) * 2006-12-08 2008-06-12 Voith Patent Gmbh Method for treating a filtrate produced from a paper fiber suspension of waste paper comprises adding the filtrate partly to the paper fiber suspension at a site lying downstream of a thickening units from which the filtrate is produced
DE102011005650A1 (en) 2011-03-16 2012-09-20 Voith Patent Gmbh Method for controlling the filter performance of a filter device
DE102013105111A1 (en) 2013-05-17 2014-11-20 Servophil AG Method for deposit prevention in papermaking systems
CN103726387B (en) * 2014-01-11 2016-05-18 金东纸业（江苏）股份有限公司 Paper machine water-saving system and method

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DE102016125303A1 (en) 2018-06-28
WO2018114153A1 (en) 2018-06-28
CN109983175A (en) 2019-07-05
DE102016125303B4 (en) 2018-12-27
CN109983175B (en) 2021-03-09

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