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WO1997025575A1 - Dispositif de sechage d'un materiau fibreux - Google Patents

Dispositif de sechage d'un materiau fibreux Download PDF

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Publication number
WO1997025575A1
WO1997025575A1 PCT/SE1997/000019 SE9700019W WO9725575A1 WO 1997025575 A1 WO1997025575 A1 WO 1997025575A1 SE 9700019 W SE9700019 W SE 9700019W WO 9725575 A1 WO9725575 A1 WO 9725575A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibre
ejector
plant according
drying
drying air
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.)
Ceased
Application number
PCT/SE1997/000019
Other languages
English (en)
Inventor
Carl-Johan SÖDERBERG
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.)
Valmet AB
Original Assignee
Sunds Defibrator Industries 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 Sunds Defibrator Industries AB filed Critical Sunds Defibrator Industries AB
Publication of WO1997025575A1 publication Critical patent/WO1997025575A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/10—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers
    • F26B17/101—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by fluid currents, e.g. issuing from a nozzle, e.g. pneumatic, flash, vortex or entrainment dryers the drying enclosure having the shape of one or a plurality of shafts or ducts, e.g. with substantially straight and vertical axis

Definitions

  • the present invention relates to fibre drying plant, and then particularly a wood fibre drying plant, of the kind defined in the preamble of Claim 1.
  • the object of the present invention is to improve the process of drying fibres, particularly wood fibres, that are intended for the manufacture of different types of board.
  • the fibres are defibrated in a refiner, from where the fibres are transferred in the form of a gas-fibre suspension at great momentum through a blow conduit to a fibre dryer for final drying of the fibres.
  • the object of the invention is to enable the momentum of the fibre suspension in the blow conduit to be utilized in drying the fibres and also to improve the glue admixture.
  • Another object of the invention is to enable a smaller final dryer to be used.
  • Fig. 1 is a schematic view of inventive fibre drying plant
  • Fig. 2 is a longitudinal, schematic view of an ejector included in the inventive plant.
  • Fibre material is defibred in a refiner 1, said material being delivered to the refiner in the direction of arrow 2.
  • a suspen ⁇ sion of fibres, water and steam is transported through the blow conduit 3 to a fibre dryer (not shown) in the direction of the arrow 4.
  • An ejector 5 is mounted in the blow conduit 3 in accordance with the invention.
  • the ejector 5 has two stages 6, 7.
  • the first stage includes an injection nozzle, in the form of a Laval nozzle 8, a mixing chamber 9 and a diffusor 10.
  • the second stage has an injection nozzle 11, which forms a continuation of the diffusor 10 in the first stage, a mixing chamber 12 and a diffusor 13.
  • the fibre suspension is delivered to the ejector 5 in the direction of arrow 14.
  • Each ejector stage has a hot air inlet, the first stage 6 according to arrow 15 and the second stage 7 according to arrow 16.
  • the first stage 6 also includes an inlet for glue for gluing the fibres, as shown by arrow 17.
  • Each of the air flows delivered in accordance with arrows 15 and 16 has been heated in a respective heat exchanger 18 and 19, although it is, of course, possible to heat the air flows in a common heat exchanger or with the aid of some other heating device.
  • the fibre suspension is delivered to the Laval nozzle 8 with the aid of the refiner house energy and leaves the nozzle at speeds above the critical speed.
  • the shock wave that occurs downstream of the Laval nozzle is utilized to break the fibre bonds, so that the specific area of the fibres exposed to the drying air will be at a maximum.
  • the high turbulence is utilized in the mixing chamber 9 to mix drying air and fibre suspension for optimal heat transfer and for optimal gluing of the fibres.
  • the effect is then amplified in the second stage 7 of the ejector, in which further drying air is delivered in accordance with arrow 16.
  • the two- stage ejector enables the temperature of the drying air to be maintained at different levels.
  • the temperature of the first stage 6 may be at a higher level than the temperature in the second stage, therewith increasing the total drying power of the ejector.
  • the blow conduit 3 continues downstream of the ejector 5 in the form of a drying channel 3 ' of larger diameter and terminates in a cyclone separator 20 that includes a vortex trap 21 and a rotor valve 22 upstream of the outlet 23 to the final dryer (not shown) .
  • the cyclone separator 20 is evacuated through a suction channel 25 with the aid of an evacuation fan 25, whereby air, fibre dust and gases are transported either to a scrubber or to a combustion plant, in accordance with arrow 26.
  • the suction channel 24 is provided with a relief valve that opens to atmo ⁇ sphere.
  • the relief valve 27 enables the length of the vortex in the cyclone 20 to be adjusted and the pressure ratio in the cyclone to be kept constant in production changes.
  • the evacuation fan In addition to effecting transportation of evacuation air from the cyclone 20, the evacuation fan also functions to heat the plant prior to starting-up and to evacuate fibres from the plant when production is stopped, without being subjected to pressure.
  • the momentum of the flow of fibres from the refiner is utilized in an ejector in accordance with the invention.
  • the suction ability of the ejector is utilized to transport the drying air.
  • the high degree of turbulence generated also achieves rapid heat transfer between drying air and fibres.
  • the fibres are given a maximum drying surface area by using the shock wave downstream of the Laval nozzle to break the fibre bonds.
  • the mixing ability of the ejector is also used to enhance the admixture of glue with the fibres.
  • the use of an ejector in a pre-stage upstream of the final drying process also enables a smaller final dryer to be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)

Abstract

Cette invention concerne une installation de séchage de fibres, laquelle comprend une unité de raffinage (1), un séchoir de fibres, ainsi qu'une conduite soufflante (3) de suspension de fibres qui est disposée entre les deux premiers éléments. Cette conduite soufflante (3) comprend un éjecteur (5) possédant des orifices d'admission (15, 16) d'air chaud de séchage. Un orifice d'admission (17), permettant d'envoyer de la colle dans la suspension de fibres, est situé sur une chambre de mélange (9), ou à proximité de celle-ci, en aval d'une buse d'injection (8) se trouvant dans l'injecteur. La chambre de mélange (9) sert à mélanger l'air de séchage, la suspension de fibres et la colle.
PCT/SE1997/000019 1996-01-11 1997-01-09 Dispositif de sechage d'un materiau fibreux Ceased WO1997025575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9600124-3 1996-01-11
SE9600124A SE508492C2 (sv) 1996-01-11 1996-01-11 Anläggning för torkning och belimning av fibermateral

Publications (1)

Publication Number Publication Date
WO1997025575A1 true WO1997025575A1 (fr) 1997-07-17

Family

ID=20401016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000019 Ceased WO1997025575A1 (fr) 1996-01-11 1997-01-09 Dispositif de sechage d'un materiau fibreux

Country Status (2)

Country Link
SE (1) SE508492C2 (fr)
WO (1) WO1997025575A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026593A1 (fr) * 1998-11-03 2000-05-11 Ecothechnology, Inc. Appareil et procede de dessechage et de desagregation de matieres humides particulaires
WO2002029342A1 (fr) * 2000-10-06 2002-04-11 Metso Paper Inc. Procede et appareil de separation de vapeur et de gaz provenant de pulpe de fibre eventuellement recouverte de colle produite par un raffineur
FR2831564A1 (fr) * 2001-10-30 2003-05-02 Weyerhaeuser Compagny Procede de production de fibres de pate dissociees, systeme de sechage et produit forme de cette pate
FR2834727A1 (fr) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny Produit constitue de pate de fibres disssociees,reticulees et sechees
FR2834729A1 (fr) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny Systeme de sechage d'une pate de fibres reticulees et dissociees
EP1375736A1 (fr) * 2001-10-30 2004-01-02 Weyerhaeuser Company Un système pour la production de fibres singulières, séchées de pâte cellulosique en utilisant un sécheur à jet et de la vapeur injectée
EP1375737A1 (fr) * 2001-10-30 2004-01-02 Weyerhaeuser Company Procédé de production de fibres singulières, séchées de pâte cellulosique en utilisant un sécheur à jet et de la vapeur injectée et produit ainsi obtenu
AU2003204780B2 (en) * 2002-06-28 2005-08-18 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
AU2003204788B2 (en) * 2002-06-28 2005-08-18 Weyerhaeuser Company System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
US7334347B2 (en) 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
CN114514101A (zh) * 2019-09-30 2022-05-17 安德里茨股份公司 在纤维材料上涂抹胶水的设备和方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354555A (en) * 1966-01-03 1967-11-28 Barr Peter Joachim Apparatus for drying finely divided particles
DE2851923C2 (de) * 1978-11-30 1984-10-18 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Vorrichtung zum Trocknen von zerfaserten und mit mindestens einem Bindemittel versetzten Hackschnitzeln, Holzspänen und dergleichen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3354555A (en) * 1966-01-03 1967-11-28 Barr Peter Joachim Apparatus for drying finely divided particles
DE2851923C2 (de) * 1978-11-30 1984-10-18 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Vorrichtung zum Trocknen von zerfaserten und mit mindestens einem Bindemittel versetzten Hackschnitzeln, Holzspänen und dergleichen

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026593A1 (fr) * 1998-11-03 2000-05-11 Ecothechnology, Inc. Appareil et procede de dessechage et de desagregation de matieres humides particulaires
US7044998B2 (en) 2000-10-06 2006-05-16 Metso Paper, Inc. Method and apparatus for separation of steam and gas from possibly glue-coated fibre pulp produced by a refiner
WO2002029342A1 (fr) * 2000-10-06 2002-04-11 Metso Paper Inc. Procede et appareil de separation de vapeur et de gaz provenant de pulpe de fibre eventuellement recouverte de colle produite par un raffineur
US7334347B2 (en) 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
EP1375736A1 (fr) * 2001-10-30 2004-01-02 Weyerhaeuser Company Un système pour la production de fibres singulières, séchées de pâte cellulosique en utilisant un sécheur à jet et de la vapeur injectée
EP1375737A1 (fr) * 2001-10-30 2004-01-02 Weyerhaeuser Company Procédé de production de fibres singulières, séchées de pâte cellulosique en utilisant un sécheur à jet et de la vapeur injectée et produit ainsi obtenu
US6769199B2 (en) 2001-10-30 2004-08-03 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
US6862819B2 (en) 2001-10-30 2005-03-08 Weyerhaeuser Company System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
FR2831564A1 (fr) * 2001-10-30 2003-05-02 Weyerhaeuser Compagny Procede de production de fibres de pate dissociees, systeme de sechage et produit forme de cette pate
AU2002300959B2 (en) * 2001-10-30 2008-08-14 Weyerhaeuser Company Process to produce dried singulated cellulose pulp fibers
FR2834729A1 (fr) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny Systeme de sechage d'une pate de fibres reticulees et dissociees
FR2834727A1 (fr) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny Produit constitue de pate de fibres disssociees,reticulees et sechees
AU2003204780B2 (en) * 2002-06-28 2005-08-18 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
AU2003204788B2 (en) * 2002-06-28 2005-08-18 Weyerhaeuser Company System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
CN114514101A (zh) * 2019-09-30 2022-05-17 安德里茨股份公司 在纤维材料上涂抹胶水的设备和方法
CN114514101B (zh) * 2019-09-30 2023-03-28 安德里茨股份公司 在纤维材料上涂抹胶水的设备和方法

Also Published As

Publication number Publication date
SE9600124D0 (sv) 1996-01-11
SE9600124L (sv) 1997-07-17
SE508492C2 (sv) 1998-10-12

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