[go: up one dir, main page]

WO1997025575A1 - A device for drying fibre material - Google Patents

A device for drying fibre material Download PDF

Info

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
French (fr)
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/en
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

Fibre drying plant includes a refiner (1), a fibre dryer and a fibre suspension blow conduit (3) arranged therebetween. The below conduit (3) includes an ejector (5) having hot drying air inlets (15, 16). An inlet (17) for delivering glue to the fibre suspension is located on or in the vicinity of a mixing chamber (9) downstream of an injection nozzle (8) in the ejector. The mixing chamber (9) functions to mix drying air, fibre suspension and glue.

Description

A DEVICE FOR DRYING FIBRE MATERIAL
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.
More specifically, 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. These objects are achieved with a plant having the characteristic features set forth in the following Claims.
The invention and the affects achieved therewith will now be described in more detail with reference to the accompanying drawings, in which
Fig. 1 is a schematic view of inventive fibre drying plant; and
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. In the illustrated embodiment, 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.
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. In this regard, 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.

Claims

1. Fibre drying plant comprising a refiner (1), a fibre dryer and a fibre suspension blow conduit (3) arranged therebetween, characterized in that the blow conduit (3) includes an ejector (5) having hot drying air inlets (15, 16).
2. Plant according to Claim 1, characterized by an inlet (17) through which glue is admixed with the fibre suspension and which is located on or in the vicinity of a mixing chamber (9) down¬ stream of an injector nozzle (8) in said ejector, wherein the mixing chamber (9) functions to mix drying air, fibre suspension and glue.
3. Plant according to Claim 2, characterized in that the ejector (5) has two stages (6, 7) each having a respective drying air inlet (15; 16); and in that the ejector nozzle in the first stage (6) is comprised of a Laval nozzle (8).
4. Plant according to any one of Claims 1-3, characterized in that a cyclone separator (20) is located between the ejector (5) and the final fibre dryer, wherein the cyclone separator includes a vortex trap (21) and a rotor valve (22) upstream of the outlet (23) to the final fibre dryer.
5. Plant according to Claim 4, characterized in that the cyclone separator (20) includes a suction channel (24) through which said cyclone is evacuated, and an evacuation fan (25) for the transportation (26) of air, fibre dust and gases to a scrubber or to a combustion facility.
6. Plant according to Claim 5, characterized in that the suction channel (24) includes a relief valve (27) which opens to atmosphere such as to enable the length of the vortex to be adjusted and the pressure ratio in the cyclone (20) to be kept constant in production changes.
PCT/SE1997/000019 1996-01-11 1997-01-09 A device for drying fibre material Ceased WO1997025575A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9600124-3 1996-01-11
SE9600124A SE508492C2 (en) 1996-01-11 1996-01-11 Plant for drying and bonding of fiber material

Publications (1)

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

Family

ID=20401016

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000019 Ceased WO1997025575A1 (en) 1996-01-11 1997-01-09 A device for drying fibre material

Country Status (2)

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

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026593A1 (en) * 1998-11-03 2000-05-11 Ecothechnology, Inc. Apparatus and method for desiccating and deagglomerating wet, particulate materials
WO2002029342A1 (en) * 2000-10-06 2002-04-11 Metso Paper Inc. Method and apparatus for separation of steam and gas from possibly glue-coated fibre pulp produced by a refiner
FR2831564A1 (en) * 2001-10-30 2003-05-02 Weyerhaeuser Compagny Production of dry cellulose fibres from pulp uses jet drier with pulp and air feeds with pre-drying additive to prevent knots
FR2834727A1 (en) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny PRODUCT CONSISTING OF DISSSOCIATED, RETICULATED AND DRY FIBER PULP
FR2834729A1 (en) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny SYSTEM FOR DRYING A RETICULATED AND DISSOCIATED FIBER PULP
EP1375736A1 (en) * 2001-10-30 2004-01-02 Weyerhaeuser Company A system for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
EP1375737A1 (en) * 2001-10-30 2004-01-02 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
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
US7334347B2 (en) 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
CN114514101A (en) * 2019-09-30 2022-05-17 安德里茨股份公司 Apparatus and method for applying glue to fibrous material

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 (en) * 1978-11-30 1984-10-18 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Device for drying shredded wood chips, wood chips and the like mixed with at least one binding agent

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 (en) * 1978-11-30 1984-10-18 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Device for drying shredded wood chips, wood chips and the like mixed with at least one binding agent

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026593A1 (en) * 1998-11-03 2000-05-11 Ecothechnology, Inc. Apparatus and method for desiccating and deagglomerating wet, particulate materials
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 (en) * 2000-10-06 2002-04-11 Metso Paper Inc. Method and apparatus for separation of steam and gas from possibly glue-coated fibre pulp produced by a refiner
US7334347B2 (en) 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
EP1375736A1 (en) * 2001-10-30 2004-01-02 Weyerhaeuser Company A system for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
EP1375737A1 (en) * 2001-10-30 2004-01-02 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
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 (en) * 2001-10-30 2003-05-02 Weyerhaeuser Compagny Production of dry cellulose fibres from pulp uses jet drier with pulp and air feeds with pre-drying additive to prevent knots
AU2002300959B2 (en) * 2001-10-30 2008-08-14 Weyerhaeuser Company Process to produce dried singulated cellulose pulp fibers
FR2834729A1 (en) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny SYSTEM FOR DRYING A RETICULATED AND DISSOCIATED FIBER PULP
FR2834727A1 (en) * 2002-01-16 2003-07-18 Weyerhaeuser Compagny PRODUCT CONSISTING OF DISSSOCIATED, RETICULATED AND DRY FIBER PULP
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
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
CN114514101A (en) * 2019-09-30 2022-05-17 安德里茨股份公司 Apparatus and method for applying glue to fibrous material
CN114514101B (en) * 2019-09-30 2023-03-28 安德里茨股份公司 Apparatus and method for applying glue to fibrous material

Also Published As

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

Similar Documents

Publication Publication Date Title
WO1997025575A1 (en) A device for drying fibre material
CA1252012A (en) Treatment of tobacco
US7905983B2 (en) Refiner steam separation system for reduction of dryer emissions
US6041615A (en) Air cycle air conditioning system
JP2001500601A (en) Dryer control method and control device
GB9702796D0 (en) Media communication apparatus
US7401417B2 (en) Method and a device for drying or heat treatment of a web-formed material
US4218832A (en) Apparatus for processing wood products using heat from a boiler for indirectly heating drying gas
US4860547A (en) Process and apparatus for extracting liquids from aggregates and from gas/vapor mixtures
US4010551A (en) Arrangement for the treatment, particularly the drying, of particulate matter by entrainment in a gas
WO1991016118A1 (en) Vapor clarification system and method
EP1021612B1 (en) Method for producing and treating wood fibres
US3339286A (en) Method and apparatus for drying wet pulverulent material in a gaseous path
CN1112164A (en) Production method and apparatus for preheating mixed sinter material using sintered hot waste gas
US20030051369A1 (en) Integral dryer
CN222623657U (en) A material dehumidification and drying system
CN1198109C (en) Method and apparatus for separation of steam and gas from possibly glue-coated fibre pulp produced by a refiner
CN221444766U (en) Drying device for shavings
US20020066202A1 (en) Method and apparatus for drying wood strands
JPH01301491A (en) Humidity adjusting device for hold
CN1987316A (en) Flow dryer for drying a fibrous product
SU1193398A1 (en) Method of drying thermolabile materials
CN120736773A (en) A high-speed cyclone sludge drying system based on the principle of air compression vortex
JP3552329B2 (en) Separation ash transport device of pressurized fluidized bed boiler
JPS60235603A (en) Method and apparatus for extracting liquid from composite orgas/steam mixture

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA CN CZ JP KR NO NZ PL US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97525143

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase