WO1999019563A1 - Installation de sechage d'une bande de materiau - Google Patents

Installation de sechage d'une bande de materiau Download PDF

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Publication number
WO1999019563A1
WO1999019563A1 PCT/SE1998/001847 SE9801847W WO9919563A1 WO 1999019563 A1 WO1999019563 A1 WO 1999019563A1 SE 9801847 W SE9801847 W SE 9801847W WO 9919563 A1 WO9919563 A1 WO 9919563A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
housing
entry
drying
brake
Prior art date
Application number
PCT/SE1998/001847
Other languages
English (en)
Inventor
Stefan Gustafsson
Roland Svensson
Original Assignee
ABB Fläkt AB
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 ABB Fläkt AB filed Critical ABB Fläkt AB
Priority to AU95630/98A priority Critical patent/AU9563098A/en
Publication of WO1999019563A1 publication Critical patent/WO1999019563A1/fr

Links

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
    • D21F5/185—Supporting webs in hot air dryers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/04—Paper-break control devices

Definitions

  • the present invention relates to a plant for drying a web of material, such as a web consisting of paper- making pulp, which plant has a housing, which has an entry and an exit and through which the web is fed from the entry to the exit, the housing containing on the one hand a plurality of superposed, substantially horizontal drying decks, which are defined by blow .boxes and, on the other, undriven turning rolls, which are arranged at the ends of the drying decks and over which the web is led to be conveyed in zigzag across the drying decks, and at least one undriven input roll being arranged at the entry of the housing and at least one driven draw roll being arranged at the exit of the housing to draw the web through the housing.
  • a web of material such as a web consisting of paper- making pulp
  • a web of pulp leaving a press plant is fed into the housing via an input roll arranged outside the entry of the housing.
  • the web is drawn through the housing by means of a draw roll arranged outside the exit of the housing.
  • the entry is arranged in the upper portion of one of the walls of the housing, and the exit is arranged in the lower portion of the opposite wall of the housing.
  • the web is conveyed in zigzag across the superposed drying decks, which are defined by lower blow boxes, which discharge heated drying air at their upper side.
  • Upper blow boxes which discharge heated drying air at their underside, are arranged above the lower blow boxes. At each drying deck level, the web is fed in a floating manner between the upper and the lower blow boxes.
  • the object of the present invention is to provide a drying plant, which is so constructed that the cleaning time is considerably reduced when a break of the web occurs between the press plant and the drying plant.
  • this object is achieved by a plant of the type mentioned by way of introduction and characterised in that at least one brake means is arranged to brake, when activated, at least one of those of said undriven rolls which are arranged closest to the entry of the housing, seen along the web, that a regulating unit is connected to the brake means to control its activation, and that at least one web break detector is arranged upstream of the housing and connected to the regulating unit to make the regulating unit, when a break of the web is detected, activate the brake means to brake the associated roll.
  • the regulating unit is preferably arranged to in- activate the brake means after activation of the same after a predetermined time.
  • Fig. 1 is a schematic side view of a drying plant according to the invention.
  • Fig. 2 is a block diagram illustrating the control of a brake arranged in the drying plant.
  • the drying plant 1 shown in Fig. 1 is intended for the drying of a web 2 consisting of papermaking pulp.
  • the web 2 is fed from a press plant 3, which is arranged before the drying plant 1.
  • the drying plant 1 has a housing 4, whose height can be 2-15 m and whose length can be 10-100 m, which implies that the housing 4, in a manner described more specifically below, can receive a 50-2000 m long section of the web 2.
  • the housing 4 has an entry 6 in the upper portion of its front wall 5 facing the press plant 3 and an exit 8 in the lower portion of its opposite rear wall 7.
  • the web 2 is fed through the housing 4 from the entry 6 to the exit 8.
  • the housing 4 contains a plurality of superposed, horizontal drying decks, each defined by a group of lower blow boxes 9, which discharge heated air at their upper side to dry the web 2. Each group of lower blow boxes 9 is associated with a group of upper blow boxes 10, which discharge heated air at their underside to dry the web 2.
  • the housing 4 also contains a plurality of rotatable but undriven turning rolls 11, 11' , 11", which are arranged at the ends of the drying decks, i.e. adjacent to the front wall 5 and the rear wall 7 of the housing 4. The web is led over the turning rolls 11, 11' , 11" to be conveyed in zigzag across the drying decks, i.e. the groups of lower blow boxes 9.
  • the web 2 obtains a horizontal run over each drying deck or group of lower blow boxes 9, which run is fed between the group of lower blow boxes 9 and the associated group of upper blow boxes 10 to be dried by means of the hot air discharged by the blow boxes 9 and 10.
  • the web 2 is fed in a floating manner between the lower and the upper blow boxes 9 and 10, respectively.
  • the press plant 3 has, in the example shown in
  • Fig. 1 two pairs of press rolls 12 and 13, in which the web 2 is pressed.
  • the web 2 fed from the press plant 3 is led over two supporting rolls 14 and 15 and two undriven input rolls 16 and 17, which are arranged immediately outside the entry 6 of the housing 4, and is introduced into the housing 4 via the entry 6.
  • the web 2 is drawn through the housing 4 by a driven draw roll 18, which is arranged outside the exit of the housing 4 and cooperates with an undriven pressure roll 19.
  • a first web break detector 20 is arranged between the two pairs of press rolls 12 and 13, and a second web break detector 21 is arranged between the supporting roll 15 and the input roll 16.
  • the detectors 20 and 21, which can, for instance, consist of photocell units, are arranged to detect a break in the web 2.
  • the detectors 20 and 21 are connected to a regulating unit 22, which comprises a control means 23, to which the detectors 20 and 21 are connected, a valve 24 and a compressed-air unit 25.
  • the control means 23 comprises time relays (not shown) and is con- nected to the valve 24 to control the same.
  • the compressed-air unit 25 is connected via the valve 24 to a pneumatic brake means 26, which is arranged, when activated, to brake the turning roll 11' , which, seen along the web 2, is located closest to the entry 6.
  • a pneumatic brake means 26 which is arranged, when activated, to brake the turning roll 11' , which, seen along the web 2, is located closest to the entry 6.
  • the control means 23 When one of the detectors 20 and 21 detects a web break, it emits a signal to the control means 23, which then immediately opens the valve 24 in order to open the connection between the compressed-air unit 25 and the brake means 26 and thus activate the same.
  • the brake means 26 then brakes the turning roll 11' in a sliding manner, so that it is rotated with greater inertia in its friction engagement with the web 2.
  • the time relays of the control means 23 are so adjusted that after a predetermined time, e.g.
  • the control means 23 closes the valve 24 again, which then interrupts the connection between the compressed-air unit 25 and the brake means 26 and inactivates the same.
  • the braking of the turning roll 11' ceases.
  • the time relays can also be so adjusted that the control means 23 can only open the valve 24 when the detectors 20 and 21 have not detected a web break during a predetermined time, e.g. 6 min, that is indirectly detected that a web 2 passes the detectors.
  • the brake means 26 can be arranged to brake one of the other turning rolls, other than the turning roll 11' , which are arranged, seen along the web 2, closest to the entry 6, e.g. the turning roll 11" which is second closest to the entry 6.
  • the brake means 26 can also be arranged to brake more than one of these turning rolls. Alternatively, a brake means can be arranged for each turning roll which is to be braked.
  • the input rolls 16 and 17 are also part of the undriven rolls that can be braked by the brake means 26 or a brake means of their own .

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une installation de séchage d'une bande de matériau (2). Cette installation comprend un boîtier (4) possédant une entrée (6) et une sortie (8). La bande est alimentée entre l'entrée et la sortie. Le boîtier (4) contient une pluralité de toits séchants (9) superposés et horizontaux et, placés aux extrémités des toits séchants, des rouleaux (11, 11', 11'') tournant sans entraînement et sur lesquels la bande (2) est guidée pour passer en zig-zag sur les toits séchants (9). Des rouleaux d'entrée (16, 17) non entraînés sont placés à l'entrée (6) du boîtier (4) et un rouleau de traction entraîné (18) est placé à la sortie (8) du boîtier (4). Ce rouleau de traction entraîné (18) tire la bande (2) pour la faire défiler dans le boîtier. Un élément de freinage (26) est conçu, lorsqu'il est activé, pour freiner au moins l'un des rouleaux non entraînés (11, 11', 11'', 16, 17) placés à proximité de l'entrée (6) du boîtier (4) le long de la bande. Une unité de régulation commande l'activation de l'élément de freinage (26). Des détecteurs de rupture de bande (20, 21), placés en amont du boîtier (4), sont reliés à une unité de régulation pour, en cas de détection d'une rupture de bande, amener cette unité de régulation à activer l'élément de freinage (26) qui est destiné à freiner le rouleau associé (11, 11', 11'', 16, 17).
PCT/SE1998/001847 1997-10-15 1998-10-14 Installation de sechage d'une bande de materiau WO1999019563A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU95630/98A AU9563098A (en) 1997-10-15 1998-10-14 Plant for drying a material web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9703751-9 1997-10-15
SE9703751A SE510707C2 (sv) 1997-10-15 1997-10-15 Anläggning för torkning av en materialbana

Publications (1)

Publication Number Publication Date
WO1999019563A1 true WO1999019563A1 (fr) 1999-04-22

Family

ID=20408616

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001847 WO1999019563A1 (fr) 1997-10-15 1998-10-14 Installation de sechage d'une bande de materiau

Country Status (3)

Country Link
AU (1) AU9563098A (fr)
SE (1) SE510707C2 (fr)
WO (1) WO1999019563A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002101143A1 (fr) * 2001-06-08 2002-12-19 Andritz Technology And Asset Management Gmbh Procede et dispositif permettant de retirer les casses d'une installation de sechage d'un materiau en forme de bande
US7972480B2 (en) 2005-12-05 2011-07-05 Metso Paper, Inc. Apparatus for removing a broken pulp web from a pulp dryer
US9057559B2 (en) 2010-11-16 2015-06-16 Andritz Technology And Asset Management Gmbh Cellulose pulp dryer having blow boxes, and a method of drying a web of cellulose pulp

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471766A (en) * 1993-03-18 1995-12-05 Valmet Paper Machinery, Inc. Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5471766A (en) * 1993-03-18 1995-12-05 Valmet Paper Machinery, Inc. Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002101143A1 (fr) * 2001-06-08 2002-12-19 Andritz Technology And Asset Management Gmbh Procede et dispositif permettant de retirer les casses d'une installation de sechage d'un materiau en forme de bande
US7972480B2 (en) 2005-12-05 2011-07-05 Metso Paper, Inc. Apparatus for removing a broken pulp web from a pulp dryer
US9057559B2 (en) 2010-11-16 2015-06-16 Andritz Technology And Asset Management Gmbh Cellulose pulp dryer having blow boxes, and a method of drying a web of cellulose pulp

Also Published As

Publication number Publication date
AU9563098A (en) 1999-05-03
SE9703751L (sv) 1999-04-16
SE9703751D0 (sv) 1997-10-15
SE510707C2 (sv) 1999-06-14

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