EP1780331A1 - Ensemble de séchage - Google Patents

Ensemble de séchage Download PDF

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Publication number
EP1780331A1
EP1780331A1 EP06121957A EP06121957A EP1780331A1 EP 1780331 A1 EP1780331 A1 EP 1780331A1 EP 06121957 A EP06121957 A EP 06121957A EP 06121957 A EP06121957 A EP 06121957A EP 1780331 A1 EP1780331 A1 EP 1780331A1
Authority
EP
European Patent Office
Prior art keywords
drying
arrangement according
performance
fibrous web
cylinder
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.)
Withdrawn
Application number
EP06121957A
Other languages
German (de)
English (en)
Inventor
Robert Attwenger
Günter Dr. Halmschlager
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
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1780331A1 publication Critical patent/EP1780331A1/fr
Withdrawn legal-status Critical Current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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • 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
    • 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

Definitions

  • the invention relates to a drying arrangement for drying a paper, board, tissue or another fibrous web in a machine for producing and / or finishing the same with at least two drying units, of which at least one of a heated high-performance drying cylinder is formed, the one Outside diameter of at least 100 cm and a wrap angle of the fibrous web of at least 150 °.
  • the object of the invention is therefore to improve the efficiency of drying in such drying arrangements.
  • the object has been achieved in that the fibrous web is guided between the high-performance drying cylinder and the following drying unit via a Ausdampfset, which is at least 50 cm long.
  • the Ausdampf zone should extend over a length which corresponds to at least 15% of the wrapped shell circumference.
  • the residence time of the fibrous web in the evaporation section is greater than 0.1 s.
  • the Ausdampfstart is even more advantageous because of the large, supplied during the wrapping of the high-performance drying cylinder of the fibrous web heat energy when the outer diameter of the high-performance drying cylinder greater than 145 cm, preferably greater than 175 cm and / or if the wrap angle of the fibrous web in the High-performance drying cylinder is greater than 180 °, preferably greater than 210 °.
  • the fibrous web should come into contact with the high-performance drying cylinder.
  • the high-performance drying cylinder should be steam-heated and preferably deliver a drying rate of at least 60 kg / m 2 h at a vapor pressure of 6 bar. (Drying rate related to the web-contacting surface)
  • the fibrous web is pressed by at least one air-permeable drying belt against the high-performance drying cylinder.
  • the fibrous web is blown in the wrap area of the high-performance drying cylinder with a blast hood with a hot medium, in particular hot air.
  • the high-performance drying cylinder is wrapped by an impermeable press belt running outside the drying belt.
  • the high-performance drying cylinder should be assigned in the wrap of the press belt, a pressure hood, which is preferably filled with water (60 - 90 ° C).
  • the pressurization leads to an increased contact pressure of the press belt and thus the fibrous web to the drying cylinder and on the other hand leads the cooling of the press belt through the water to a temperature gradient of the fibrous web on the dry belt to the press belt.
  • drying dryer unit with a further high-performance drying cylinder follows the high-performance drying cylinder in the interest of intensive drying.
  • the high-performance drying cylinder is followed by a drying unit with conventional drying cylinders or even no further drying unit.
  • the fibrous web In order to allow the evaporation of the fibrous web as unhindered as possible, the fibrous web should be covered within the Ausdampfrange at least on one side of any band or roller o. ⁇ .
  • the fibrous web is guided in the Ausdampfrange of at least one band which has an air permeability, which is above 100 cfm.
  • the exhaust steam line suction and / or blowing elements should be assigned to the steam discharge. This prevents excessive air humidity in the area of the evaporation section.
  • the steam-heated high-performance drying cylinder 2,3 has a diameter of about 180 cm.
  • the fibrous web 1 wraps around the high-performance drying cylinder 2, 3 with a wrap angle of more than 210 °.
  • the fibrous web 1 Because of the direct contact of the fibrous web 1 with the hot jacket surface of the high-performance drying cylinder 2, 3 and the long contact time with the jacket surface, the fibrous web 1 is heated to a high temperature.
  • an air-permeable and moisture-storing drying belt 5 and an outer, impermeable and thermally conductive press belt 6 wraps around the respective high-performance drying cylinder 2, 3.
  • the fibrous web 1 may wrap around the high-performance drying cylinder 2, 3 only with an outer drying belt 5, and hot blowing air in the wrapping area be directed from a blast hood onto the drying belt 5 to the fibrous web 1.
  • the hot blast air complements the effect of the hot jacket surface of the high-performance drying cylinder 2, 3 and thus ensures a heating of the fibrous web 1 on both sides.
  • the first drying unit with the high-performance drying cylinder 2 is followed by a further drying unit with a further high-performance drying cylinder 3. This may be necessary in the case of very moist fibrous webs 1 or to achieve a high drying capacity in a limited space.
  • the high-performance drying cylinders 2, 3 have a common drying belt 5 and a common pressing belt 6, which reduces the effort and simplifies the belt guides.
  • the fibrous web 1 In order to give the fibrous web 1 the possibility of a comprehensive evaporation, it is guided between the two high-performance drying cylinders 2, 3 via a steam removal section 7, in which the fibrous web 1 is supported only by the drying belt 5.
  • the press belt 6 is led away from the drying belt 5 after the looping of the first high-performance drying cylinder 2 and fed back before the wrapping of the following high-performance drying cylinder 3.
  • one side namely the side of the fibrous web 1 which is particularly strongly heated by contact with the hot jacket surface of the high-performance drying cylinder 2, is free of covers and can thus release the water vapor unhindered.
  • drying belt 5 is located on the other side of the fibrous web 1, this is so permeable to air that on this side too, although less evaporation can take place.
  • the fibrous web 1 is dried before and after the high-performance drying cylinder 2 in drying units with conventional drying cylinders 8.
  • the fibrous web 1 is supported by a drying wire 9, guided meandering over heated drying cylinders 8 and guide rollers.
  • the high-performance drying cylinder 2 is here below the level of the drying cylinder 8, which ensures optimum space utilization.
  • the fibrous web 1 passes from the upstream drying unit in the free train to the drying belt 5 and is guided by this to the high-performance drying cylinder 2.
  • the drying belt 5 After the looping of the high-performance drying cylinder 2 and the routing of the press belt 6, the drying belt 5 leads the fibrous web 1 in the vicinity of the following drying unit. Again, the fibrous web 1 runs from the drying belt 5 to the first conventional drying cylinder 8 unsupported.
  • webbing belts should have a relatively large open area to allow for evaporation.
  • relatively open dryer fabrics are suitable.
  • suction and / or blowing elements 10 in the region of the evaporation section 7 is indicated. These should be arranged in particular on the free side of the fibrous web 1 or on both sides and prevent by the suction or blowing away of the water vapor of the fibrous web 1, the formation of excessive humidity in the region of the Ausdampfrange. 7

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP06121957A 2005-10-28 2006-10-09 Ensemble de séchage Withdrawn EP1780331A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510051658 DE102005051658A1 (de) 2005-10-28 2005-10-28 Trocknungsanordnung

Publications (1)

Publication Number Publication Date
EP1780331A1 true EP1780331A1 (fr) 2007-05-02

Family

ID=37596202

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06121957A Withdrawn EP1780331A1 (fr) 2005-10-28 2006-10-09 Ensemble de séchage

Country Status (2)

Country Link
EP (1) EP1780331A1 (fr)
DE (1) DE102005051658A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138630A2 (fr) 2008-06-26 2009-12-30 Voith Patent GmbH Cylindre
EP2138631A1 (fr) 2008-06-26 2009-12-30 Voith Patent GmbH Installation de séchage et cylindre
DE102008002655A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Verfahren zum Trocknen einer laufenden Faserstoffbahn
DE102008002657A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Verfahren zur Herstellung einer eine Innen-und eine Außenschale umfassenden Doppelschale eines Zylinders

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0427218A2 (fr) 1989-11-10 1991-05-15 Voith Sulzer Papiermaschinen GmbH Système de séchage
DE4428745A1 (de) * 1994-08-13 1996-02-15 Voith Gmbh J M Einrichtung zum Trocknen einer laufenden Bahn
WO1999064671A1 (fr) 1998-06-10 1999-12-16 Valmet Corporation Machine a papier integree
WO2005100682A1 (fr) * 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
WO2005100684A1 (fr) 2004-04-13 2005-10-27 Voith Patent Gmbh Dispositif de sechage

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0427218A2 (fr) 1989-11-10 1991-05-15 Voith Sulzer Papiermaschinen GmbH Système de séchage
DE4428745A1 (de) * 1994-08-13 1996-02-15 Voith Gmbh J M Einrichtung zum Trocknen einer laufenden Bahn
WO1999064671A1 (fr) 1998-06-10 1999-12-16 Valmet Corporation Machine a papier integree
WO2005100682A1 (fr) * 2004-04-13 2005-10-27 Voith Patent Gmbh Machine destinee a la fabrication d'une bande de matiere fibreuse
WO2005100684A1 (fr) 2004-04-13 2005-10-27 Voith Patent Gmbh Dispositif de sechage

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2138630A2 (fr) 2008-06-26 2009-12-30 Voith Patent GmbH Cylindre
EP2138631A1 (fr) 2008-06-26 2009-12-30 Voith Patent GmbH Installation de séchage et cylindre
DE102008002655A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Verfahren zum Trocknen einer laufenden Faserstoffbahn
DE102008002656A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Trocknungsanordnung
DE102008002663A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Zylinder
DE102008002657A1 (de) 2008-06-26 2009-12-31 Voith Patent Gmbh Verfahren zur Herstellung einer eine Innen-und eine Außenschale umfassenden Doppelschale eines Zylinders

Also Published As

Publication number Publication date
DE102005051658A1 (de) 2007-05-03

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