EP1010804A1 - Verfahren und Vorrichtung zur Behandlung von Ausschuss - Google Patents

Verfahren und Vorrichtung zur Behandlung von Ausschuss Download PDF

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Publication number
EP1010804A1
EP1010804A1 EP99123123A EP99123123A EP1010804A1 EP 1010804 A1 EP1010804 A1 EP 1010804A1 EP 99123123 A EP99123123 A EP 99123123A EP 99123123 A EP99123123 A EP 99123123A EP 1010804 A1 EP1010804 A1 EP 1010804A1
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EP
European Patent Office
Prior art keywords
broke
filtrate
thickening
defiberizing
treating
Prior art date
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Application number
EP99123123A
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English (en)
French (fr)
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EP1010804B1 (de
Inventor
Pasi Heiskanen
Matti Luukkanen
Riita Rahkonen
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Andritz Oy
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Andritz Oy
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Publication date
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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

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 .
  • 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 precipitate 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 precipitate of the press is typically removed from the process.
  • 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 directly to a thickening device 36, preferably a press, by means of which the consistency of the broke is raised to HC -zone, 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
  • 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)
EP99123123A 1998-11-20 1999-11-19 Verfahren und Vorrichtung zur Behandlung von Ausschuss Expired - Lifetime EP1010804B1 (de)

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

Publications (2)

Publication Number Publication Date
EP1010804A1 true EP1010804A1 (de) 2000-06-21
EP1010804B1 EP1010804B1 (de) 2004-03-03

Family

ID=8552948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99123123A Expired - Lifetime EP1010804B1 (de) 1998-11-20 1999-11-19 Verfahren und Vorrichtung zur Behandlung von Ausschuss

Country Status (4)

Country Link
EP (1) EP1010804B1 (de)
AT (1) ATE261014T1 (de)
DE (1) DE69915227T2 (de)
FI (1) FI111466B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019110876A1 (en) * 2017-12-08 2019-06-13 Kemira Oyj Method for predicting or controlling microbial status of a paper or board making process

Families Citing this family (1)

* 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

Citations (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

Patent Citations (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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019110876A1 (en) * 2017-12-08 2019-06-13 Kemira Oyj Method for predicting or controlling microbial status of a paper or board making process
CN111433406A (zh) * 2017-12-08 2020-07-17 凯米拉公司 用于预测或控制纸张或纸板制造过程中微生物状态的方法
CN111433406B (zh) * 2017-12-08 2023-06-16 凯米拉公司 用于预测或控制纸张或纸板制造过程中微生物状态的方法
US11859347B2 (en) 2017-12-08 2024-01-02 Kemira Oyj Method for predicting or controlling microbial status of a paper or board making process

Also Published As

Publication number Publication date
FI982512A (fi) 2000-05-21
ATE261014T1 (de) 2004-03-15
FI982512A0 (fi) 1998-11-20
DE69915227T2 (de) 2005-02-03
DE69915227D1 (de) 2004-04-08
FI111466B (fi) 2003-07-31
EP1010804B1 (de) 2004-03-03

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