EP1538258B1 - Procédé pour guider de l'eau blanche d'une machine à papier - Google Patents

Procédé pour guider de l'eau blanche d'une machine à papier Download PDF

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Publication number
EP1538258B1
EP1538258B1 EP04025257A EP04025257A EP1538258B1 EP 1538258 B1 EP1538258 B1 EP 1538258B1 EP 04025257 A EP04025257 A EP 04025257A EP 04025257 A EP04025257 A EP 04025257A EP 1538258 B1 EP1538258 B1 EP 1538258B1
Authority
EP
European Patent Office
Prior art keywords
feed line
white water
water
pipe
cross
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
EP04025257A
Other languages
German (de)
English (en)
Other versions
EP1538258A1 (fr
Inventor
Anton Gmeiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1538258A1 publication Critical patent/EP1538258A1/fr
Application granted granted Critical
Publication of EP1538258B1 publication Critical patent/EP1538258B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the white water that accumulates first ie in the vicinity of the paper machine headbox, can be placed directly in an open trough below the paper machine sieve. to be collected. It is often called white water I or because of the visible filling and pulp content and white water.
  • white water I the amount of white water which accumulates first, based on the sieve length, is particularly high.
  • it has a high speed in the direction of wire direction immediately after leaving the papermaking screen and is then deflected laterally at least once. The current is very restless, full of swirls and pulsating.
  • spray flows form, which entrain and integrate parts of the ambient air.
  • Methods of the type considered here are particularly suitable for further guiding the white water led out of the forming area of the papermachine fabric, thereby achieving a calming of the flow. In most cases, the gas content of the white water is reduced.
  • the WO 01/81676 A1 shows a plant with which the white water of a paper machine is to be processed and deaerated. In this case, a short cycle for the first incurred and a long cycle for the later incurred white water is formed. In addition, in the long cycle, the white water, which is not open but in suction boxes, is introduced through special riser pipes ("barometric pipes"). For the short circuit the use of a degassing pump is provided, without providing information as to whether and how the white water flow should be calmed.
  • open channels fulfill their purpose, their installation requires considerable effort. So, for example, a larger support structure can be provided, since open-topped channels can contribute little to the support of the weight of the water masses. It is also easy to see that there is a risk of settling fibers and fillers in the open channel areas where the water level is located. To prevent this, spray pipes are therefore used in some places.
  • the invention is based on the object to improve the existing method so that it is possible to easily dissipate the resulting white white water from the forming of the paper machine and thereby achieve a calming of the flow. As far as possible, the gas content should also be significantly reduced.
  • a paper machine PM has, for example, a forming roller 7 mounted in the frame 9, on which an endless wire 3 rotates.
  • the suspension required for paper production is fed through a headbox 2 and a broad jet nozzle 5 from above onto the rotating sieve 3. Since this suspension usually has a water content between 98 and 99%, a large amount of white water passes through the sieve 3 immediately after the addition of the suspension and is collected as white water SW in the white water tank 8. Even after the wire 3 has left the area of the white water tank 8, further white water is removed, which is not of direct interest here. As already described, the white water SW in the white water tank 8 has a large flow velocity and considerable turbulence.
  • the pipeline extends horizontally in its longitudinal direction. Length and cross-section of the pipe 1 are advantageously designed so that the residence time is between 20 and 30 seconds, which experience has led to a sufficient calming of the turbulence and Vorentgasung. In practice, this means at a typical flow rate of about 0.5 m / s, a length of the pipe 1 of 10 to 15 m.
  • the accumulating in the upper part of the pipe 1 gas can be removed by one or more top-mounted degassing 4, will be discussed in more detail.
  • the pipeline 1 discharges into a white water tank 6 open at the top. The level 11 of this white water tank 6 can be adjusted to be above the pipeline 1, e.g. a difference height D of about 100 - 200 mm is useful.
  • Another advantage of the method is that with simple means of Siebwassermengenstrom can be measured early, since already at the end of the pipe 1, the physical conditions for such a measurement can be given.
  • an inductive flow meter 10 is shown here.
  • the paper machine PM shown in FIGS. 1 and 2 is to be understood here only as an example.
  • paper machines provided with other formers or headboxes can also discharge the openly occurring white water in the described manner through the pipeline used according to the invention.
  • the main direction of the pipe 1 is shown parallel to the wire feed direction of the paper machine, depending on the available space, a different arrangement of the pipe can be made. she can also have one or more deflections.
  • Fig. 3 the conditions in the vicinity of a patch on the pipe 1 degassing 4 are shown.
  • This figure shows the degassing tube 12, which is usefully mounted in the uppermost part of the pipe cross-section of the pipe 1 and here in operation is partially filled with white water. Therefore, in this degassing tube 12 forms a free surface at which the gas can escape from the white water.
  • a phase limit can be adjusted. Shown is also the level 11 of the white water tank (or another counter level at the outlet of the pipe 1). Due to the flow velocity in the pipeline 1, the level 11 can deviate from that of the free surface in the degassing tube 12.
  • a simplest Entgasungsdorfkeit results when the gas can pass through the overlying connection pipe 13 into the environment, which would come close to the effect of the above-mentioned open channels without having their disadvantages.
  • Such a steam suction 14 is only hinted at here. It may be expedient to spray the free surface, which forms in the degassing tube 12, with water, in particular white water, in order to avoid the formation of deposits.
  • Fig. 3 also shows a way to prevent possible settlements at the bottom of the pipe 1.
  • Fig. 3 also shows a way to prevent possible settlements at the bottom of the pipe 1.
  • openings 17 bottom spoiler 18 is inserted into the lower part of the pipeline. It can be operated with white water under overpressure.
  • the typical cross-sectional shape of the pipeline 1 (FIG. 2) for carrying out the process may be that of a circle, which is particularly favorable in terms of production and strength.
  • other cross sections can be considered as the cheapest solution.
  • FIG. 4 an upright oval profile 19 and in FIG. 5 a horizontal oval profile 20 are shown.
  • a rhombus 21, as shown in Fig. 6, combines high strength with good flow characteristics.
  • a hexagonal profile 23 according to FIG. 8 may be expedient.
  • the corners are due to fluidic (and manufacturing) reasons rounded. It is of course conceivable to use other profiles for the pipeline 1 in order to carry out the process optimally.

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  • Paper (AREA)
  • Developing Agents For Electrophotography (AREA)

Claims (18)

  1. Procédé pour guider de l'eau de toile (SW), occasionnée de façon ouverte sur une machine à papier (PM), qui est collectée d'abord dans la machine à papier (PM) et est acheminée ensuite pour le traitement ultérieur,
    caractérisé en ce que
    la transmission s'effectue dans une conduite (1) fermée, qui forme par rapport à l'horizontale un angle (α) compris entre 0 et 15°, de préférence 0°, et en ce que le temps de séjour moyen de l'eau de toile (SW) dans cette conduite (1) est d'au moins 5 secondes, de préférence 20 à 30 secondes.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la section de la conduite (1) est circulaire.
  3. Procédé selon la revendication 1,
    caractérisé en ce que
    la section de la conduite (1) est ovale.
  4. Procédé selon la revendication 1,
    caractérisé en ce que
    la section de la conduite (1) a la forme d'un losange(21) arrondi aux angles avec un angle situé en haut.
  5. Procédé selon la revendication 1,
    caractérisé en ce que
    la section de conduite (1) a la forme d'un hexagone (22) large et arrondi aux angles avec un angle situé en haut.
  6. Procédé selon la revendication 1,
    caractérisé en ce que
    la section de la conduite (1) a la forme d'un pentagone arrondi aux angles avec un angle situé en haut.
  7. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'eau de toile (SW) est l'eau de toile générée d'abord de la machine à papier.
  8. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    l'eau de toile (SW) est guidée à partir de la conduite (1) dans un volume de liquide avec une surface de liquide libre sur laquelle règne une pression atmosphérique.
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    l' eau de toile (SW) est guidée à partir de la conduite (1) dans un réservoir d'eau de toile (6) ouvert en haut.
  10. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    du gaz, en particulier de l'air, est enlevé de l'eau de toile (SW) par au moins une ouverture dans la paroi de la conduite (1).
  11. Procédé selon la revendication 10,
    caractérisé en ce que
    la conduite (1) est dotée d'au moins un, de préférence deux à trois dispositifs de dégazage (4, 4') placés en haut.
  12. procédé selon la revendication 10 ou 11 respectivement en liaison avec la revendication 8 ou 9,
    caractérisé en ce que
    le niveau (11) de la surface de liquide du volume de liquide est réglé au plan géodésique au-dessus de l'arête supérieure intérieure de la conduite (1).
  13. Procédé selon la revendication 12,
    caractérisé en ce que
    le niveau (11) est réglé à 200 mm maximum au-dessus de l'arête supérieure de la conduite.
  14. Procédé selon la revendication 11, 12 ou 13,
    caractérisé en ce que
    le dispositif de dégazage (4, 4') est placé sous dépression.
  15. Procédé selon la revendication 14,
    caractérisé en ce que
    la dépression est réglée sur 1,5 à 2 bars.
  16. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le flux de quantité de l'eau de toile (SW) est mesuré dans la conduite (1).
  17. Procédé selon la revendication 16,
    caractérisé en ce que
    un débitmètre (10) inductif, installé à l'extrémité de la conduite (1), est utilisé pour la mesure.
  18. Procédé selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    une vitesse d'écoulement moyenne de l'eau de toile (SW) d'au maximum 0,8 m/s, de préférence 0,2 à 0,6 m/s, est réglée dans la conduite (1).
EP04025257A 2003-12-04 2004-10-23 Procédé pour guider de l'eau blanche d'une machine à papier Expired - Lifetime EP1538258B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10356576A DE10356576A1 (de) 2003-12-04 2003-12-04 Verfahren zum Führen von an einer Papiermaschine offen anfallendem Siebwasser
DE10356576 2003-12-04

Publications (2)

Publication Number Publication Date
EP1538258A1 EP1538258A1 (fr) 2005-06-08
EP1538258B1 true EP1538258B1 (fr) 2007-09-26

Family

ID=34442431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04025257A Expired - Lifetime EP1538258B1 (fr) 2003-12-04 2004-10-23 Procédé pour guider de l'eau blanche d'une machine à papier

Country Status (3)

Country Link
EP (1) EP1538258B1 (fr)
AT (1) ATE374282T1 (fr)
DE (2) DE10356576A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000803A1 (de) 2009-02-12 2010-08-19 Voith Patent Gmbh Doppelsiebformer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI97332C (fi) * 1993-12-23 2006-11-24 Pom Tech Oy Ab Kaasunerotuspumppu paperinvalmistuksessa virtaavan veden tai nestemäisen kuitususpension ja ilman erottamiseksi toisistaan pumppauksen yhteydessä
DE19938799A1 (de) * 1999-08-16 2001-02-22 Voith Sulzer Papiertech Patent Verfahren zum Führen und Entlüften von an einer Papiermaschine anfallendem Siebwasser
FI107744B (fi) * 2000-04-19 2001-09-28 Pom Tech Oy Ab Menetelmä ja järjestely imuelementin yhteydessä
DE60125358T2 (de) * 2000-06-09 2007-09-27 Metso Paper, Inc. Vorrichtung für einen siebwasserabführkanal
DE10107328A1 (de) * 2001-02-16 2002-08-29 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Abführen von Siebwasser

Also Published As

Publication number Publication date
ATE374282T1 (de) 2007-10-15
DE10356576A1 (de) 2005-07-07
EP1538258A1 (fr) 2005-06-08
DE502004005070D1 (de) 2007-11-08

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