EP3559342B1 - System for process water treatment - Google Patents

System for process water treatment 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
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process water
machine
sorting
washing device
led
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German (de)
French (fr)
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EP3559342A1 (en
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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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    • 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.

Description

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.
Die Erfindung betrifft ebenso ein Verfahren zum Betrieb dieser Anlage.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.

Derartige Anlagen sind beispielsweise in der DE 10 2013 105 111 A1 , der DE 699 15 227 T2 , der DE 10 2006 034 186 A1 sowie der DE 10 2011 005 650 A1 beschrieben.
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. 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 systems are for example in the DE 10 2013 105 111 A1 , the DE 699 15 227 T2 , the DE 10 2006 034 186 A1 as well as the DE 10 2011 005 650 A1 described.
It is known that 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. Such 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.

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.
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.If 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.

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.
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.
In der DE 102 18 265 wird eine Anlage zur Entaschung beschrieben, bei der die Faserstoffsuspension einer Waschvorrichtung zugeführt wird, deren Feinfraktion zu einer Flotationsvorrichtung geführt und anschließend das Accept dieser Flotationsvorrichtung rückgeführt wird.Here too, particularly with a high proportion of waste paper, there can be a considerable accumulation of fine and filler materials, which has a negative effect on the strength of the fibrous web.
One possible remedy to avoid such disturbances is to remove the fine and fillers from the circuit. For example, it is possible to set up an existing flotation system in such a way that it deashes the stock much more than is necessary for the paper that is later made from the fiber itself. But then the material losses increase and the yield decreases.
In the DE 102 18 265 a system for ash removal is described in which the pulp suspension is fed to a washing device, the fine fraction of which is fed to a flotation device and then the acceptance of this flotation device is returned.

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.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.

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, 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.

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 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.

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 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.

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.Therefore, 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.

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.
In dieser Flotationsvorrichtung können so die Fein- und Füllstoffe sowie Stickies ohne großen Faserverlust abgeschieden und anschließend verworfen oder aber wiederverwendet werden.While the coarse fraction of this washing device with a high fiber content is returned to the material cycle of the machine or an upstream process for treating a fiber suspension, the fine fraction of the washing device with a high filler content but a low fiber content reaches the flotation device.
In this flotation device, the fines and fillers as well as stickies can be separated off without a great deal of fiber loss and then discarded or reused.

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.If necessary, 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.

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.
Entsprechend ihrem Anteil an Fasern, Füll- und Feinstoffen bezeichnet man die Teilströme des Scheibenfilters als Faserfiltrat(auch Fangstoff genannt), Trübfiltrat, Klarfiltrat und Superklarfiltrat.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.

Für die Abtrennung der Füllstoffe eignet sich als Flotationsvorrichtung insbesondere eine Druckentspannungsflotations-Vorrichtung.
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.A pressure release flotation device is particularly suitable as a flotation device for separating off the fillers.
With 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.

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. 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.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.

Bei durchgehendem Betrieb kann so der Anreicherung von Fein- und Füllstoffen wirksam begegnet werden.With continuous operation, 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.However, it is also possible to pass the partial fractions of the sorting or filtering device to the washing device only over certain periods of time in order to reduce the average filler content of the process water reused in the machine.

Ebenso ist es möglich über die Menge der zur Waschvorrichtung geführten Teilfraktionen die Menge des Füllstoffgehaltes in der Faserstoffbahn zu steuern bzw. zu steuern.It is also possible to control or control the amount of filler content in the fibrous web via the amount of the partial fractions fed to the washing device.

Nachfolgend soll die Erfindung anhand eines Ausführungsbeispiels näher erläutert werden. In der beigefügten Zeichnung zeigt die Figur ein Anlagenschema zur Abwasserbehandlung.The invention will be explained in more detail below using an exemplary embodiment. In the attached drawing, the figure shows a system 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.
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.As is known per se, 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.

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.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. After the high-consistency treatment, the fabric is diluted again.

Am Ende wird die fertige Faserstoffsuspension in einer Stoffvorlage für die Verarbeitung auf der Papier- oder Kartonmaschine bereitgestellt.
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.
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.
Häufig ist der Anteil an Füll- und Feinstoffen aber selbst bei diesen Prozesswässern so hoch, dass eine Entaschung erforderlich ist.
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.At the end, 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.
In order to prevent part of the ash load from the paper machine from getting back into the stock preparation with the help of this dilution water, a later white water with a lower ash content, e.g. white water or press water, can be used.
Often, however, the proportion of fillers and fines is so high, even with this process water, that ash removal is necessary.
According to the figure, for this purpose 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.

Im Scheibenfilter wird das Abwasser dann in mehrere Teilfraktionen 9, 10 aufgeteilt, welche man im Allgemeinen als Faserfiltrat, Trübfiltrat, Klarfiltrat oder Superklarfiltrat bezeichnet.
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.In the disc filter, 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.

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.Both sub-fractions 9, 10 still contain a great deal of fine and fillers, i.e. ash. In order to reduce the ash content, therefore, 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.

In dieser Waschvorrichtung 2 kann auch auf Grund der geringen Stoffdichte eine hohe Konzentration der Fein- und Füllstoffe in deren Feinfraktion 12 erreicht werden.
Die Grobfraktion 11 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 11 der Waschvorrichtung 2 in eine Stoff-Bütte 6, gegebenenfalls über eine Puffer-Bütte 18.
Als Waschvorrichtung 2 eignen sich bekannte Schrägsiebe, Bogensiebe, Trommeleindicker usw.In this washing device 2, a high concentration of the fines and fillers in their fine fraction 12 can also be achieved due to the low stock density.
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.

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 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.

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.
Neben Fein- und Füllstoffen können über diese Flotationsvorrichtung 3 auch Mikrostickies im Rejekt 17 abgeschieden werden.While the reject 17 of this flotation device 3 is discarded or reused in one or another machine for the production of a pulp web, 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.
In addition to fine and fillers, this flotation device 3 can also be used to separate out micro stickies in reject 17.

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.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.

Die Anlageneinheit mit der Waschvorrichtung 2 und der Flotationsvorrichtung 3 kann zur Ausschleusung von Asche aus dem Prozess ständig in Betrieb sein.The plant unit with the washing device 2 and the flotation device 3 can be in constant operation to discharge ash from the process.

Sie kann aber zur Steigerung der Festigkeit der Faserstoffbahn insbesondere nur bei geringen Flächengewichten der Faserstoffbahn zugeschaltet werden.However, in order to increase the strength of the fibrous web, it can only be switched on when the fibrous web has a low grammage.

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.
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.It is also possible, via the proportion of the partial fractions 9, 10 of the sorting or filtering device 1 fed to the washing device 2, to change the extent of the amount of fine and fillers separated from the process.
The more ash that is discharged, the lower the proportion of fine and filler materials in the fibrous web, so that this can be controlled or regulated via this system unit.

Claims (10)

  1. System for treating process water from a machine for producing and/or finishing a paper, board, tissue or other fibrous web, wherein the process water is subdivided in a sorting or filtering device (1) into a plurality of partial fractions (9, 10) having differently high proportions of fibres, characterized in that at least two partial fractions (9, 10) are led at least partly over at least one predefined time interval to a common washing device (2), the fine fraction (12) from this washing device (2) can be led to a flotation device (3) and the accept (15) of this flotation device (3) can be led to the machine, another machine for producing a fibrous web or an upstream process for treating a fibrous suspension.
  2. System according to Claim 1, characterized in that the coarse fraction (11) from the washing device (2) can be fed back into the material circuit of the machine or an upstream process for treating a fibrous suspension.
  3. System according to Claim 1 or 2, characterized in that the washing device (2) can also be fed with other process water from the machine or an upstream process for treating a fibrous suspension.
  4. System according to one of the preceding claims, characterized in that the partial fraction (9) from the sorting or filtering device (1) having the highest proportion of fibre is led to the washing device (2).
  5. System according to one of the preceding claims, characterized in that the flotation device (3) is designed as a dissolved-air flotation device.
  6. System according to one of the preceding claims, characterized in that the sorting or filtering device (1) is designed as a disc filter.
  7. System according to one of the preceding claims, characterized in that process water (16) from a former (7) for sheet formation can be led at least partly to the sorting or filtering device (1).
  8. System according to one of the preceding claims, characterized in that process water (13) from a press section (8) for dewatering the fibrous web can be led at least partly to the washing device (2) and/or to the flotation device (3).
  9. System according to Claim 8, characterized in that it comprises a sorting device (4) for the process water (13) from the press section (8) before the washing device (2) or the flotation device (3).
  10. Method for operating a system according to one of the preceding claims, characterized in that the partial fractions (9, 10) from the sorting or filtering device (1) are led to the washing device (2) only over specific time periods to lower the average filler content of the process water reused in the machine.
EP17801678.8A 2016-12-22 2017-11-16 System for process water treatment Active 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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EP3559342A1 EP3559342A1 (en) 2019-10-30
EP3559342B1 true EP3559342B1 (en) 2020-12-30

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WO (1) WO2018114153A1 (en)

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

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