EP1010804B1 - Procédé et dispositif pour le traitement des cassés - Google Patents

Procédé et dispositif pour le traitement des cassés Download PDF

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Publication number
EP1010804B1
EP1010804B1 EP99123123A EP99123123A EP1010804B1 EP 1010804 B1 EP1010804 B1 EP 1010804B1 EP 99123123 A EP99123123 A EP 99123123A EP 99123123 A EP99123123 A EP 99123123A EP 1010804 B1 EP1010804 B1 EP 1010804B1
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EP
European Patent Office
Prior art keywords
broke
filtrate
thickening
treating
defiberizing
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.)
Expired - Lifetime
Application number
EP99123123A
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German (de)
English (en)
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EP1010804A1 (fr
Inventor
Pasi Heiskanen
Matti Luukkanen
Riita Rahkonen
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Andritz Oy
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Andritz Oy
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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

Definitions

  • the present invention relates to a method of and apparatus for treating broke. Especially the invention relates to treating broke coming from a paper and/or paperboard machine so that the pulp may be metered back to said machine in a way which is more preferable than prior art methods in view of both paper and/or paperboard manufacture and environmental aspects.
  • broke refers to waste material generated by a paper, paperboard or the like machine in some stage of the production process. Broke is generated continuously in the so-called edge cutting where the paper or paperboard web produced by the paper or paperboard machine is cut to the desired width, i.e. at both sides of the web a strip of essentially finished product is cut off. In addition to that, broke is generated during process breaks caused by various reasons, whereby the whole production of the production machine has to be diverted to the broke system. Broke is also generated by the winder, and sometimes even whole paper or paperboard rolls are damaged when still in the mill so that they have to be returned to reuse through the broke system. In other words, the water content of broke varies to a remarkable extent according to the generation point of the broke.
  • the broke may well be said to have a consistency, whereby the broke is often referred to as so-called wet broke, but broke obtained after the press section is already in most cases referred to as so-called dry broke. And especially when whole paper rolls are diverted to broke, the product practically corresponds to dry finished product.
  • the broke In a conventional broke system, the broke is stored in a consistency of about 3 - 4 %. Such a low consistency requires huge buffer tanks for the paper or paperboard machine for the process waters, because breaks in the production process and sometimes long discontinuous process stages must be prepared for beforehand. In such a case, the broke system has to be able to receive all paper or paperboard produced by the machine either as such, whereby the broke is wet broke being collected in the couch pit or, in case of dry broke, through broke pulpers or the like utilizing process waters in the slushing. Said big buffer tanks increase the time needed for changes of grade and complicate the regulation of the process. In this connection it is worth mentioning that the dimensions of said broke and water containers of big production machines are typically in the order of thousands of cubic meters. As an example it may be stated that when the production of a paper machine is e.g. 700 t/d, the size of both the dilution water tank and the broke tank is about 5000 m 3 .
  • DE-A-195 32 301 discloses a method and an apparatus for treating broke obtained from a paper, paperboard or coating machine. Diluted broke is fed, in sequence, to a pulper, a heavy particle separator, a contamination sorting device and a destipper. The thus processed broke is then fed to a thickening device, such as a press, and subsequently to a storage container.
  • Figure 1 illustrates a prior art broke system for treating dry broke and comprising a broke pulper, a dilution liquid tank, an intermediate tank, a press, a storage container and pumps required by the process.
  • This prior art broke system operates so that dry broke is introduced into one of several pulpers in the paper machine and diluted during the slushing to an appropriate consistency with white water obtained from the dilution liquid tank.
  • the slushed broke is taken by means of a pump into the intermediate tank in form of a dilute, most usually 2 - 4 %, suspension. From the intermediate tank the dilute broke suspension is lead by means of a pump into the press, with which press the consistency of the broke is raised into storage consistency, usually in the order of 10 - 20 %.
  • the press filtrate is typically removed from the process.
  • This kind of prior art broke system treating dry broke typically operates so that the intermediate tank is dimensioned to .receive all possible low consistency broke that can be thought to be generated from the paper machine, in other words the whole production of the paper mill during some predetermined period of time.
  • the dilution liquid tank has to be dimensioned to store all the liquid required for diluting the maximum amount of broke being generated.
  • the press is dimensioned for treating broke practically on a continuous basis.
  • One of the dimensioning principles is that the press must be capable of treating about 15 - 20 % of the maximum production of the paper machine. That is, the pulpers are dimensioned to defiberize the dry broke quickly to a dilute consistency to be taken into the intermediate tank performing the function of a buffer tank for the continuously operating press.
  • the method and apparatus for treating pulp broke according to one preferred embodiment of the invention are characterized, e.g., in that the dry broke is thickened immediately after defiberizing, most commonly slushing performed with a pulper, by means of an applicable thickening device, preferably a press, to a suitable consistency which may be preferably 20 - 35 %, more preferably 25 - 30 % (when thinking more widely, the consistency may vary even in the range of 12 - 45 %, considering all different situations and pulp grades) and stored in said consistency.
  • the broke is stored e.g. in a HC-silo provided with a diluting scraper at the bottom.
  • a press capable of producing 700 t/d only and a storage container of about 500 m 3 only are required.
  • the method and apparatus for treating dry broke according to another preferred embodiment of the invention are further characterized in that the filtrate removed from the defiberized pulp by means of a thickening device, preferably a press, is guided back during production break to be used as dilution water in the dry broke defiberizer.
  • the method and apparatus according to a third preferred embodiment of the invention are characterized in that in a normal running situation the filtrate of the thickening device, preferably a press, is lead to a suitable separation device in order to remove undesired materials and impurities and further taken into the white water treatment system.
  • the broke system of Fig. 1 for treating dry broke comprises a broke pulper 10, a dilution liquid tank 12, an intermediate tank 14, a press 16, a storage container 18 and pumps 20 and 22 required by the process.
  • This broke system according to prior art operates so that dry broke is introduced to one of several pulpers 10 of the paper machine, and diluted during the slushing into a suitable consistency with white water obtained from the dilution liquid tank 12.
  • the broke slushed in the pulper 10 is taken by means of pump 20 to the intermediate tank 14 in form of a dilute suspension, most usually 2 - 4 %.
  • From the intermediate tank the dilute broke suspension is taken by means of pump 22 to press 16, by means of which the consistency of the broke is raised to storage consistency, usually in the order of 10 - 20 %.
  • the filtrate of the press is typically removed from the process.
  • the broke system for treating dry broke typically operates so that the intermediate tank 14 is dimensioned to receive all possible low-consistency broke that may be considered to originate from the paper machine.
  • the dilution liquid tank 12 has to be dimensioned to receive the whole amount of liquid needed to dilute the dry broke in this kind of situation when broke is originated in maximum amount.
  • the process is further characterized in that the press 16 is dimensioned to treat the broke practically on a continuous basis.
  • One principle of dimensioning is that the press must be capable of treating about 15 - 20 % of the maximum production of the paper machine.
  • the pulpers 10 are dimensioned to disintegrate the dry broke quickly to a dilute consistency to be taken into the intermediate tank functioning as a buffer tank for the continuousty operating press.
  • Fig. 2 is a schematic illustration of a broke system for treating dry broke according to a preferred embodiment of the invention, in which the broke obtained in a dilute consistency from the defiberizer 10, preferably a pulper/pulpers, is lead in all different running situations in the mill directly to a thickening device 36, preferably a press, by means of which the consistency of the broke is raised to HC-range, considering all different situations of use and all grades of pulp to a consistency of 12 - 45 %, preferably to a consistency of 20 - 35 %, more preferably to a consistency of 25 - 30 %, and from which the filtrate is immediately returned back to function as dilution liquid of the defiberizer 10.
  • a thickening device 36 preferably a press
  • the described system is applicable to the treatment of continuously originating broke such as e.g. trimmings and the maximum amount of broke originating during breaks.
  • the filtrate recirculation illustrated in Fig. 2 is utilized only during web breaks, whereby both the defiberizer and the thickening device must be capable of treating the maximum amount of broke. In that case, there is also the biggest need for dilution liquid, so that by recirculating the dilution liquid it is possible to avoid using big dilution liquid buffer tanks. Only at the initial stage of the defiberizing, dilution liquid obtained from another source 32 is needed.
  • essentially all dilution liquid needed in the defiberizing of the dry broke is obtained from the thickening device, preferably a press 36, the filtrate of which is collected, schematically illustrated into a reservoir 40, and taken by means of a pump 42 via pipe line 44 to the defiberizer 10, preferably a pulper.
  • Fig. 3 illustrates a broke system for treating dry broke according to another preferred embodiment of the invention, which system describes the liquid circulation of the process better than the system of Fig. 2.
  • white water obtained from tank 52 is presented to be used not only for diluting the thickened and defiberized broke fed from the press 36 by means of a feeding apparatus into the HC-container 38 and stored in HC-consistency, but also for diluting the broke during the defiberizing.
  • a fiber-recovery filter 54 preferably a disc filter, where an essential part of solid matter may be removed from the water so that clear filtrate from reservoir 56 is used for diluting the dry broke.
  • Filtrate line 48 coming from the press 36 is provided with a separation device 50 for removing undesired material from the filtrate, after which the cleaned filtrate is guided into reservoir 58 for the turbid filtrate of the fiber-recovery filter 54, which turbid filtrate is returned back to the feed of filter 54.
  • the clear filtrate obtained from reservoir 56 is guided into its own reservoir 32, which reservoir provides the defiberizer 10 with dilution liquid.
  • the process of Fig. 3 allows for the following two running possibilities. Firstly, it is possible to treat the filtrate of the thickening device 36 with the separation means for the undesired material 50 and the white water filter 54 in every running situation of the defiberizer 10 and the thickening device 36, although, in consideration of possible breaks, the system should be prepared to treat large amounts of liquid quickly with the separation means 50 and the white water filter 54. In principle, this kind of use is not impossible, though, and, accordingly, is not to be excluded from the scope of protection of the invention.
  • the second running possibility is to circulate the filtrate of the thickening device through the separation means 50 and the white water filter 54 only when the defiberizer 10 and the thickening device are subjected to a constant load i.e. to evenly running constant-flow broke, as, e.g., in the defiberizing of the trimmings.
  • the dimensioning of both the separation means 50 and the white water filter 54 is simple, thanks to constant loads.
  • the filtrate of the thickening device may be guided directly through pipeline 44 to the defiberizer 10 without treating with the separation device and the white water filter. Peak loads, during which the filtrate of the thickening device 36 is needed to be guided directly to the defiberizer 10, occur, in addition to web breaks, e.g. in situations when the broke entering the defiberizer is relatively dry, i.e. broke coming from the final stage of paper or paperboard manufacture where the most part of liquid has been removed from the product.
  • a further possible method is an arrangement wherein there is a separate separation device for undesired material for treating the filtrate of the thickening device and a treatment apparatus for the filtrate for big loads, i.e. for web breaks or for treating dry broke, so that it would be possible to always clean all the filtrate obtained from the thickening device prior to returning it back to the pulper.
  • this kind of arrangement is naturally the most optimal, but naturally it requires investments, compared to the arrangements of Fig. 2 and 3 in which the existing apparatus of the mill is being utilized whenever possible.
  • a press as the thickening device, because many modem presses are capable of producing a consistency of the desired 25 - 35 %, and when using appropriate pulp grades and/or applicable presses even a consistency of 45 %, although said consistency range is by no means inevitable.
  • a press e.g. a drum press described for instance in FI patents 84397 and 88435 may be utilized.

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  • Paper (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)

Claims (19)

  1. Procédé de traitement de la pâte aux cassés de fabrication selon lequel le matériau de cassés de fabrication obtenu de la machine à papier ou à carton, ou autre machine de production similaire, est dilué, défibré et épaissi pour stockage à une consistance élevée, caractérisé en ce qu'après lesdites dilution et défibrage la pâte aux cassés de fabrication est conduite directement au dispositif d'épaississement à l'aide duquel elle est épaissie à une consistance élevée et à partir duquel elle est conduite vers une cuve de stockage (38) à une consistance de 12 à 45 %.
  2. Procédé selon revendication 1 caractérisé en ce que le filtrat obtenu lors dudit épaississement est retourné vers ledit défibrage afin de servir en tant que liquide dilutif.
  3. Procédé selon revendication 1 ou 2 caractérisé en ce que ledit épaississement se déroule à l'aide d'une presse (36).
  4. Procédé selon revendication 1,2 ou 3 caractérisé en ce que le filtrat obtenu dudit épaississement est traité afin d'en extraire le matériau indésirable dudit filtrat.
  5. Procédé selon revendication 4 caractérisé en ce que le filtrat obtenu dudit épaississement est traité à l'aide d'un dispositif de récupération de fibres (54).
  6. Procédé selon revendication 5 caractérisé en ce que au moins une partie du liquide dilutif du défibrage est constitué du filtrat clair du dispositif de récupération de fibres (54).
  7. Procédé selon revendication 1,2 ou 3 caractérisé en ce que filtrat obtenu dudit épaississement est retourné directement vers ledit défibrage pour être utilisé par exemple en tant que liquide dilutif lorsque la quantité des cassés à traiter est maximale ou lorsque la quantité de liquide exigée pour diluer les cassés est élevée.
  8. Procédé selon revendication 4 caractérisé en ce que le filtrat obtenu dudit épaississement est traité afin d'en extraire la matière indésirable lorsque le défibrage et l'épaississement se maintiennent à charge constante.
  9. Procédé selon revendication 5 caractérisé en ce que le filtrat clair venant du dispositif de récupération de fibres (54) est utilisé en tant que liquide stocké pour le défibrage.
  10. Dispositif pour le traitement de la pâte de cassés de fabrication qui comprend un ou plusieurs défibreur(s) (10) soit un désintégrateur ou similaire, un dispositif d'épaississement et une cuve de stockage, caractérisé en ce que ledit défibreur (10) est couplé via une voie de passage (33) directement avec le dispositif d'épaississement (36) sans cuve intermédiaire.
  11. Dispositif selon revendication 10 caractérisé en ce que ledit dispositif d'épaississement est une presse (36).
  12. Dispositif selon revendication 10 ou 11 caractérisé en ce que ledit dispositif d'épaississement (36) est muni d'un dispositif (40) pour recevoir le filtrat et que ledit dispositif (40) destiné à recevoir le filtrat est couplé via une voie de passage (44) avec ledit défibreur (10).
  13. Dispositif selon revendication 12 caractérisé en ce que ledit dispositif (40) pour recevoir le filtrat est couplé via une voie de passage (48) avec le dispositif (50) pour extraire la matière indésirable du filtrat.
  14. Dispositif selon revendication 12 caractérisé en ce que ledit dispositif (40) pour recevoir le filtrat est couplé avec le dispositif de récupération du fibre (54).
  15. Dispositif selon revendication 14 caractérisé en ce que ledit dispositif (40) pour recevoir du filtrat est couplé à un système de traitement (58) pour traiter le filtrat trouble du dispositif de récupération de fibres (54).
  16. Dispositif selon revendication 10 caractérisé en ce que le système de traitement et de recirculation du filtrat du dispositif d'épaississement (36) comprend un dispositif de récupération de fibres (54) et une cuve de stockage du filtrat clair (32) aussi bien qu'un nombre suffisant de pompes.
  17. Dispositif selon revendication 16 caractérisé en ce que le système de traitement et de recirculation du filtrat du dispositif d'épaississement (36) comprend ultérieurement un dispositif pour séparer la matière indésirable précédant le dispositif de récupération de fibres (54).
  18. Dispositif selon revendication 10 caractérisé en ce que le dispositif d'épaississement (36) est muni d'un dispositif pour conduire la pâte aux cassés de fabrication épaissie dans une cuve de stockage à consistance élevée (38).
  19. Dispositif selon revendication 10 caractérisé en ce que ledit dispositif d'épaississement (36) est prévu à traiter toute la sortie de la machine de production, si nécessaire.
EP99123123A 1998-11-20 1999-11-19 Procédé et dispositif pour le traitement des cassés Expired - Lifetime EP1010804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI982512A FI111466B (fi) 1998-11-20 1998-11-20 Menetelmä ja laitteisto hylkymassan käsittelemiseksi
FI982512 1998-11-20

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EP1010804A1 EP1010804A1 (fr) 2000-06-21
EP1010804B1 true EP1010804B1 (fr) 2004-03-03

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EP99123123A Expired - Lifetime EP1010804B1 (fr) 1998-11-20 1999-11-19 Procédé et dispositif pour le traitement des cassés

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EP (1) EP1010804B1 (fr)
AT (1) ATE261014T1 (fr)
DE (1) DE69915227T2 (fr)
FI (1) FI111466B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016125303B4 (de) 2016-12-22 2018-12-27 Voith Patent Gmbh Anlage zur Prozesswasserbehandlung
FI130064B (en) * 2017-12-08 2023-01-13 Kemira Oyj METHOD FOR PREDICTING OR CONTROLLING MICROSTATICITY IN THE MANUFACTURING PROCESS OF PAPER OR BOARD

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19532301A1 (de) * 1995-09-01 1997-03-06 Voith Sulzer Stoffaufbereitung Verfahren zur Aufbereitung von Trockenausschuß einer Papier-, Karton- oder Streichmaschine

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Publication number Publication date
FI982512A0 (fi) 1998-11-20
EP1010804A1 (fr) 2000-06-21
DE69915227D1 (de) 2004-04-08
FI982512A7 (fi) 2000-05-21
ATE261014T1 (de) 2004-03-15
DE69915227T2 (de) 2005-02-03
FI111466B (fi) 2003-07-31

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