EP1236829B1 - Dispositif de séchage par impact - Google Patents

Dispositif de séchage par impact Download PDF

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Publication number
EP1236829B1
EP1236829B1 EP01125932A EP01125932A EP1236829B1 EP 1236829 B1 EP1236829 B1 EP 1236829B1 EP 01125932 A EP01125932 A EP 01125932A EP 01125932 A EP01125932 A EP 01125932A EP 1236829 B1 EP1236829 B1 EP 1236829B1
Authority
EP
European Patent Office
Prior art keywords
dryer according
supporting belt
impingement dryer
cooling
impingement
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
EP01125932A
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German (de)
English (en)
Other versions
EP1236829A3 (fr
EP1236829A2 (fr
Inventor
Peter Kahl
Markus Oechsle
Roland Mayer
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
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of EP1236829A2 publication Critical patent/EP1236829A2/fr
Publication of EP1236829A3 publication Critical patent/EP1236829A3/fr
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Publication of EP1236829B1 publication Critical patent/EP1236829B1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/044—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using air hoods over the cylinders

Definitions

  • the invention relates to an impingement dryer for drying a paper, board, tissue or another fibrous web, according to the preamble of present claim 1.
  • Such impingement dryer are known for example from US-A-5588223, US-A-4361466 or DE 19841768 A1, where they are part of the dryer section of a paper machine.
  • the temperature of the hot air or of the superheated steam can reach values between 300 ° and 500 ° C.
  • the temperature resistance of the candidate support bands in particular because of the plastic content between 140 and 240 ° C.
  • the fibrous web relative to the support band is a sufficient thermal insulation, are essentially only the uncovered areas of the support band, d. H. the edges are thermally endangered.
  • the width of the impingement dryer is limited to the web width, which, however, brings difficulties or a considerable effort with changing width of the fibrous web with it.
  • the object of the invention is therefore to provide a simple thermal protection of the support band without significantly affecting the drying of the fibrous web.
  • the cooling of the support belt takes place after the delivery of the fibrous web from this to a following unit.
  • the edge of the support band is cooled in a range between 50 and 1000 mm.
  • the cooling of the support belt takes place in different degrees in cooling zones delimited transversely to the web running direction. This allows adaptation of the necessary cooling intensity, for example, to the local temperature of the support band. Advantages also arise when the cooling zones associated cooling capacity is controlled separately.
  • the cooling of the support belt is effected by at least one cooling device in the form of liquid and / or compressed air nozzles.
  • the liquid nozzles should be supplied with a liquid whose boiling point is below the maximum allowable temperature of the support band, preferably water or alcohols, for example polyethylene glycol.
  • This evaporative cooling prevents sufficient liquid supply that the temperature of the support belt rises above the boiling temperature of the liquid.
  • the liquid bounced off the support belt and / or liquid mist emanating therefrom should be removed from guide elements and / or catching devices and / or suction devices.
  • the pressure and / or the throughput of the liquid and / or compressed-air nozzles should preferably be controllable individually or in zones.
  • temperature sensors for measuring the temperature of the support belt in the web running direction before and under circumstances but also after the cooling device helpful which should be arranged in particular with respect to the edge of the support band.
  • the support band should be designed as a sieve.
  • it is to ensure a stable running of the support belt and thus the fibrous web and in terms of the distance to the impingement dryer advantageous when the support belt is guided during the application of the fibrous web with the hot air and / or superheated steam flow over a rotating support roller.
  • a structurally simple solution results when the hot air and / or hot steam impact flow is generated by a drying hood arranged in a peripheral region of the support roller.
  • the cooling of the support band according to the invention can also be used in hot air suspended dryers.
  • the cooling of the support band can take place outside the area leading the fibrous web, if necessary, at several points along the run of the support band.
  • the impingement dryer is part of a paper machine for drying the fibrous web 1 and is essentially formed by a rotating support roller 7 and a drying hood 8.
  • the drying hood 8 is arranged at a distance of a few centimeters to the support roller 7 and extends over a substantial part of the circumference of the support roller. 7
  • the support roller 7 is looped around by an endlessly circulating support belt 2 in the form of a dryer fabric and the outer fibrous web 1. From the arranged in the wrap drying hood 8, the impingement of the fibrous web 1 takes place with hot air, which leads to the drying of the fibrous web 1. For this purpose, several directed to the fibrous web 1 nozzles are present in the dryer hood 8.
  • the support belt 2 is inevitably wider than the fibrous web 1. This leads, in particular with changing width of the fibrous web 1 to an edge zone of the support belt 2 directly, d. H. is exposed without intermediate fibrous web 1 of the hot air, which may cause the same due to the plastic content in the support band 2 to thermal damage.
  • the support belt 2 passes the fibrous web 1 from the support roller 7 to a, surrounded by an air-permeable sieve 10 and sucked guide roller 9.
  • the guide roller 9 supported by the negative pressure, the transfer of the fibrous web 1 to the wire 10th
  • the support belt 2 After delivery of the fibrous web 1, the support belt 2 is cooled over its entire width by a cooling device in the form of water nozzles 4. In this case, the hot air directly exposed edge zone of the support belt 2 is particularly strongly cooled.
  • the water nozzles 4 are in a support band 2 towards open hood and are arranged in several transverse to the web running direction 3, one behind the other rows.
  • the cooling of the support belt 2 takes place in different directions perpendicular to the web running direction 3 delimited cooling zones.
  • the water nozzles 4 of the respective cooling zone are connected to a common pressure line 11 that can be controlled by a valve.
  • the edge of the support band 2 is cooled with a width between 200 and 400 mm, since there takes place the largest thermal stress.
  • the cooling performance is also enhanced in an outline of the fibrous web 1 in an upstream unit of the paper machine and indeed over the entire width.
  • the heating power of the drying hood 8 as well as the temperature of the support belt 2 detected by sensors are likewise taken into account.

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  • Paper (AREA)

Claims (15)

  1. Dispositif de séchage par impact pour le séchage d'une nappe de papier, carton, papier-tissu ou d'une autre nappe fibreuse (1), dans lequel la nappe fibreuse (1) est sollicitée d'un côté par un écoulement d'impact d'air chaud et/ou de vapeur chaude et s'appuie du côté opposé sur une bande de support (2) perméable à l'air et entraînée sans fin, au moins la zone marginale de la bande de support (2) sollicitée directement par l'écoulement d'impact d'air chaud et/ou de vapeur chaude étant refroidie, caractérisé en ce que la puissance de refroidissement est commandée ou régulée, à savoir est ajustée en fonction de la puissance de chauffage du dispositif de séchage par impact et/ou est régulée en fonction de la température de la bande de support (2), notamment de la température de la zone de refroidissement concernée, et/ou est commandée en fonction d'une détection de déchirure de la nappe fibreuse (1) située en amont.
  2. Dispositif de séchage par impact selon la revendication 1, caractérisé en ce que le refroidissement de la bande de support (2) s'effectue après que la nappe fibreuse (1) a été amenée de celle-ci à une unité suivante.
  3. Dispositif de séchage par impact selon la revendication 1 ou 2, caractérisé en ce qu'au moins le bord de la bande de support (2) non recouvert par la nappe fibreuse (1) est refroidi.
  4. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que le bord de la bande de support (2) est refroidi dans une plage de largeur de 50 à 1000 mm.
  5. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de support (2) est refroidie sur toute la largeur.
  6. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que le refroidissement de la bande de support (2) s'effectue avec une intensité différente dans des zones de refroidissement limitées transversalement à la direction d'avance de la nappe (3).
  7. Dispositif de séchage par impact selon la revendication 6, caractérisé en ce que la puissance de refroidissement associée aux zones de refroidissement peut être commandée séparément.
  8. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que le refroidissement de la bande de support (2) s'effectue par au moins un dispositif de refroidissement sous forme de buses de liquide et/ou d'air sous pression (4).
  9. Dispositif de séchage par impact selon la revendication 8, caractérisé en ce que les buses de liquide (4) sont alimentées en un liquide dont la température d'ébullition est en dessous de la température maximale admissible de la bande de support (2), de préférence en eau ou en alcools, par exemple en polyéthylèneglycol.
  10. Dispositif de séchage par impact selon la revendication 8 ou 9, caractérisé en ce que le liquide rebondissant de la bande de support (2) et/ou le nuage de liquide en provenant est évacué par des éléments de guidage et/ou des dispositifs de captage (5) et/ou des dispositifs d'aspiration (6) .
  11. Dispositif de séchage par impact selon l'une quelconque des revendications 8 à 10, caractérisé en ce que la pression et/ou le débit des buses de liquide et/ou d'air sous pression peut de préférence être commandé individuellement ou séparément par zones.
  12. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de support (2) est réalisée sous forme de toile.
  13. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de support (2) est guidée sur un rouleau de support (7) rotatif pendant la sollicitation de la nappe fibreuse (1) avec l'écoulement d'impact d'air chaud et/ou de vapeur chaude.
  14. Dispositif de séchage par impact selon la revendication 13, caractérisé en ce que l'écoulement d'impact d'air chaud et/ou de vapeur chaude part d'une hotte de séchage (8) disposée dans une région périphérique du rouleau de support (7) .
  15. Dispositif de séchage par impact selon l'une quelconque des revendications précédentes, caractérisé en ce que le refroidissement de la bande de support (2) s'effectue en dehors de la région guidant la nappe fibreuse (1) en plusieurs endroits le long du parcours de la bande de support (2).
EP01125932A 2001-02-28 2001-10-31 Dispositif de séchage par impact Expired - Lifetime EP1236829B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10109525 2001-02-28
DE10109525A DE10109525A1 (de) 2001-02-28 2001-02-28 Prallströmtrockner

Publications (3)

Publication Number Publication Date
EP1236829A2 EP1236829A2 (fr) 2002-09-04
EP1236829A3 EP1236829A3 (fr) 2004-01-14
EP1236829B1 true EP1236829B1 (fr) 2006-09-27

Family

ID=7675730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01125932A Expired - Lifetime EP1236829B1 (fr) 2001-02-28 2001-10-31 Dispositif de séchage par impact

Country Status (3)

Country Link
US (1) US20020116838A1 (fr)
EP (1) EP1236829B1 (fr)
DE (2) DE10109525A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016125172A1 (de) * 2016-12-21 2018-06-21 Voith Patent Gmbh Verfahren zum Betrieb eines Heizgruppenteilsystems und Heizgruppenteilsystem

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361466A (en) * 1977-10-27 1982-11-30 Beloit Corporation Air impingement web drying method and apparatus
US5588223A (en) * 1994-06-14 1996-12-31 Asea Brown Boveri Inc. Restrained paper dryer
FI102624B1 (fi) * 1994-06-23 1999-01-15 Valmet Corp Menetelmä ja laite paperiradan tai vastaavan kuivatuksessa tai jäähdytyksessä
US6372090B1 (en) * 1998-08-04 2002-04-16 Valmet Corporation Method and apparatus for handling paper or cardboard webs
DE19841768A1 (de) * 1998-09-11 2000-03-16 Voith Sulzer Papiertech Patent Trockenpartie
FI106269B (fi) * 1999-05-10 2000-12-29 Valmet Corp Päällepuhallussovitelma ja -menetelmä käsiteltävän paperi- tai kartonkirainan käyristymistaipumuksen kompensoimiseksi sekä paperi- tai kartonkikone

Also Published As

Publication number Publication date
EP1236829A3 (fr) 2004-01-14
DE10109525A1 (de) 2002-09-05
DE50111090D1 (de) 2006-11-09
EP1236829A2 (fr) 2002-09-04
US20020116838A1 (en) 2002-08-29

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