EP1334323A1 - Procede pour traiter des substances fibreuses - Google Patents

Procede pour traiter des substances fibreuses

Info

Publication number
EP1334323A1
EP1334323A1 EP01996713A EP01996713A EP1334323A1 EP 1334323 A1 EP1334323 A1 EP 1334323A1 EP 01996713 A EP01996713 A EP 01996713A EP 01996713 A EP01996713 A EP 01996713A EP 1334323 A1 EP1334323 A1 EP 1334323A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
fibers
heated
vapor
vapors
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Withdrawn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
EP01996713A
Other languages
German (de)
English (en)
Inventor
Dieter Greubel
Timon Gruber
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP1334323A1 publication Critical patent/EP1334323A1/fr
Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure

Definitions

  • the invention relates to a method for processing fibrous substances, in particular wood fibers, which are dried in a dryer, through which a steam-gas mixture is passed as cycle gas (hereinafter "vapors") in an essentially closed drying cycle, which after passing through the The dryer is separated from the dried fibers in a separator and then returned to a first heat exchanger connected to the drying circuit, to which a gas heated via a furnace is fed to heat the vapors, a partial flow of the vapors being seen in front of this first heat exchanger in the flow direction of the drying circuit decoupled, heated in a second heat exchanger and then introduced into the furnace and burned there.
  • vapors cycle gas
  • Exhaust gas is passed through the first heat exchanger before it is fed, the decoupled part of the steam-gas mixture being heated.
  • the drum dryer used in this previously known method does not allow the use of fibrous materials with a low bulk density and high internal friction, since the transport mechanism within the rotary tube does not work with such materials.
  • a high proportion of accompanying steam (as motive steam) leads to increased fuel consumption in this previously known method.
  • DE 196 54 043 A1 shows a thermal dryer for bulk materials such as wood chips.
  • a rotary drum dryer is provided as well as a separate furnace to generate the required drying heat, but without the combustion gases being fed directly to the rotary drum dryer.
  • At least one gas / gas heat exchanger is provided, which extracts heat from the combustion exhaust gases.
  • a vapor circuit is also provided, which comprises the drying apparatus and a return for vapors emerging therefrom back to the entry point, an excess partial flow of the vapors being drawn off as a result of the drying taking place in the drying apparatus being drawn off from the vapor circuit and being fed to the furnace as secondary air, where at temperatures of at least 800 ° C the organic pollutants contained are largely burned.
  • the gas / gas heat exchanger arrangement transfers the heat extracted from the combustion exhaust gases to the vapors flowing in the vapor circuit to the dryer inlet side, which then re-enter the drying apparatus and serve as a drying agent there with cooling.
  • An air preheater is also provided which extracts additional heat from the combustion exhaust gases after they have passed through the gas / gas heat exchanger for heating the vapor and transfers it to fresh air which is fed to the dryer.
  • the combustion exhaust gases is additionally arranged in front of the gas / gas heat exchanger arrangement at least one heat exchanger as a heater, through which the combustion exhaust gases which cool down flow through on the heating side and thereby either generate steam on the cooling side or a liquid heat transfer medium flowing through on the cooling side and having a high volume-specific heat capacity is heated, in which
  • additional heat is supplied to the drying apparatus on the cooling side in addition to the heating previously carried out by vapors, the heater and heating register forming a heating medium circuit.
  • the invention has for its object to develop a particularly energetically improved processing method for fibrous substances.
  • this object is primarily achieved in that the outcoupled vapor partial stream is cooled in a vapor condenser before it is heated in the second heat exchanger and is thereby depleted and the condensate obtained is fed out.
  • the condensate trap provided according to the invention reduces the use of energy, in particular when reheating the residual vapors.
  • the vapor is decoupled in a temperature-controlled manner with the aim of optimal gas-gas combustion and emission reduction. Emission-related control of the temperature of the discharged vapors enables the emission to be minimized at every operating point.
  • the flow tube dryer allows a short residence time of the fibers in the order of 2 - 10 seconds.
  • the fiber material in the flow tube dryer is dried in the fluidized state and cannot “bake”.
  • the process temperatures in the flow tube dryer are always above the water boiling point between 100 ° C. and 350 ° C. Drying with superheated steam reduces the risk of over-drying, since the fibers begin As a result, the heat transfer is increased compared to conventional drying, which results in a shorter drying time
  • propellant steam is therefore fed into the flow tube dryer according to the invention, which means that the temperature in the dryer can be significantly higher than that of conventional methods.
  • the water requirement for fiber processing can be significantly reduced if the condensate fed out of the vapor condenser is used to generate propellant steam in a refiner used for fiber production.
  • the dried fibers which have been separated from the drying cycle are glued in a subsequent gluing process. It is advantageous if the dried fibers are fed into a largely closed gluing air circuit, pass through a glue wetting zone and are separated from the circulating transport air in one of these downstream separators.
  • the part of the plant relating to drying is designated I and the part of the plant relating to gluing is designated II.
  • the drying I comprises an essentially closed drying circuit 1 through which a steam-gas mixture acted upon by a fan 2 circulates as circulating gas, which is referred to below as vapors.
  • a section of this drying circuit 1 is designed as a flow tube dryer 3, into which wet fibers 4 and motive steam in an order of magnitude of approximately 30-50% of the mass flow are fed.
  • the fibers After passing through the flow tube dryer 3, the fibers are separated from it in a separator 5, which is preferably a cyclone separator Vapors separated and discharged as dry fibers 6.
  • the vapors are returned to a first heat exchanger 7, which is connected to the drying circuit 1, and passed through this, in order to then flow again through the flow tube dryer 3.
  • a partial stream 8 of the vapor is decoupled in front of the first heat exchanger 7, cooled in a vapor condenser 9 and thereby depleted, reheated in a downstream second heat exchanger 10 and then introduced into a furnace 11 and burned there.
  • the combustion chamber of the furnace 11 has a connection for feeding gas 12 and a connection for feeding combustion air 13.
  • the condensate 14 obtained in the vapor condenser 9 is fed out of the condenser and e.g. used for generating propellant steam in a refiner used for fiber production and / or as make-up water for fiber gluing.
  • the exhaust gas 17 cooled by the application of the two hot gas circuits 15, 16 from a chimney 18 is passed into the atmosphere as exhaust air 19.
  • the vapor extraction is temperature controlled. For this, the vapor extraction and the reheating of the depleted
  • a temperature of 300-350 ° C. will set at the inlet of the flow tube dryer 3 and a temperature of approximately 120-130 ° C. at the dryer outlet.
  • the vapors which are circulated are therefore heated in the first heat exchanger 7 from the low temperature mentioned to 300-350 ° C.
  • the vapor partial flow 8 which is coupled out in front of the first heat exchanger 7 thus has a temperature of 120-130 ° C., is cooled in the vapor condenser 9 to approximately 40-60 ° C. and then in the second heat exchanger 10 again to a temperature of approximately 160 - heated up to 300 ° C.
  • the combustion gases from furnace 1 1 reach a temperature of approx. 900 ° C and then cool down to approx. 160 ° C after exposure to the two hot gas circuits 15, 16.
  • the residence time of the fibers in the flow tube dryer 3 is approximately 2-10 seconds. During this time, the fibers are dried to 2-4% dry.
  • the dry fibers 6 excreted in the separator 5 are fed into a largely closed gluing air circuit 22, pass through a glue wetting zone 23 into which glue 27 is injected, and are separated from the circulating transport air in one of these downstream separators 24.
  • the glued fibers 25 emerging from the separator 24, which is preferably a cyclone separator, are fed to a further processing.
  • the transport speed of the fibers passing through the glue wetting zone 23 is between 20 and 35 m / s, preferably around 27 m / s.
  • the temperature of the transport air is around 40 - 60 ° C. O
  • False air 26 is removed from the gluing air circuit 22 via an air discharge and fed into the combustion chamber of the furnace 11 as additional combustion air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un procédé pour traiter des substances fibreuses, notamment des fibres de bois, qui sont séchées dans un séchoir à travers lequel est acheminé un mélange vapeur-gaz sous la forme d'un gaz en circulation (dénommé ci-après </= vapeur chaude >/= ), dans un circuit de séchage pratiquement fermé (1). Après son passage à travers le séchoir, ce mélange est séparé des fibres séchées (6) dans un séparateur (5) puis réintroduit dans un premier échangeur de chaleur (7) placé dans le circuit de séchage (1). Un gaz chauffé par l'intermédiaire d'une unité de chauffage (11) est acheminé à cet échangeur de chaleur pour chauffer la vapeur chaude. Vu dans le sens d'écoulement du circuit de séchage (1), un flux partiel (8) de la vapeur chaude est séparé en amont du premier échangeur de chaleur (7), réchauffé dans un deuxième échangeur de chaleur (10) puis introduit dans l'unité de chauffage (11) où il est brûlé. L'objectif de l'invention est réduire les émissions et de réaliser des économies d'énergie. A cet effet, le flux partiel de vapeur chaude (8) séparé est refroidi et par conséquent appauvri dans un condenseur de vapeur chaude (9) avant son réchauffement dans le deuxième échangeur de chaleur (10), et le condensat (14) alors produit est évacué.
EP01996713A 2000-11-14 2001-10-06 Procede pour traiter des substances fibreuses Withdrawn EP1334323A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10056459 2000-11-14
DE10056459A DE10056459C1 (de) 2000-11-14 2000-11-14 Verfahren zum Aufbereiten faseriger Substanzen
PCT/DE2001/003842 WO2002040932A1 (fr) 2000-11-14 2001-10-06 Procede pour traiter des substances fibreuses

Publications (1)

Publication Number Publication Date
EP1334323A1 true EP1334323A1 (fr) 2003-08-13

Family

ID=7663300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01996713A Withdrawn EP1334323A1 (fr) 2000-11-14 2001-10-06 Procede pour traiter des substances fibreuses

Country Status (4)

Country Link
US (1) US6931757B2 (fr)
EP (1) EP1334323A1 (fr)
DE (1) DE10056459C1 (fr)
WO (1) WO2002040932A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157596C1 (de) * 2001-11-23 2003-03-20 Fraunhofer Ges Forschung Verfahren zum Aufbereiten faseriger Substanzen
DE10221367B4 (de) * 2002-05-13 2006-05-11 Bankwitz, Robert, Dr. Pneumatischer Schleudertrockner
US20060101663A1 (en) * 2004-11-08 2006-05-18 Perin Nolan A Lumber drying
EP1843114A1 (fr) * 2006-04-06 2007-10-10 Swedish Exergy Consulting AB Installation de séchage
DE102007037605A1 (de) 2007-08-07 2009-02-12 Mars Incorporated Verfahren und Vorrichtung zum Trocknen eines Materials
CN106123546A (zh) * 2016-08-08 2016-11-16 胡启志 一种锯末烘烤装置
CN107314658A (zh) * 2017-08-17 2017-11-03 文安县天华密度板有限公司 一种新型木质纤维多段式闪急干燥方法和装置

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
AT399044B (de) 1988-05-10 1995-03-27 Kaindl Holzindustrie Verfahren und vorrichtung zur emissionsarmen trocknung von holzspänen
US5059404A (en) * 1989-02-14 1991-10-22 Manufacturing And Technology Conversion International, Inc. Indirectly heated thermochemical reactor apparatus and processes
NZ229080A (en) * 1989-05-11 1991-10-25 Convertech Group Ltd Two stage process and equipment for the steam hydrolysis of woody material
CH676500A5 (fr) * 1990-05-18 1991-01-31 Werner Kunz
DE4017806A1 (de) * 1990-06-01 1991-12-05 Koerting Ag Verfahren und anlage zur kontinuierlichen trocknung von holzspaenen, holzfasern oder anderen schuettguetern
DE4023518A1 (de) * 1990-07-24 1992-03-05 Fritz Egger Gmbh Verfahren und anlage zum trocknen von feuchtem gut
SE500058C2 (sv) 1991-04-05 1994-03-28 Anders Kullendorff Förfarande för rostning av biomaterial
NL9100606A (nl) 1991-04-08 1992-11-02 Vandenbroek Int Bv Drooginrichting.
ATE161622T1 (de) * 1994-11-24 1998-01-15 Kunz Drytec Ag W Verfahren zum trocknen einer substanz, insbesondere von holzspänen
AT404876B (de) * 1995-05-16 1999-03-25 Andritz Patentverwaltung Verfahren zum trocknen von feuchtem gut, insbesonders von holzfasern und anlage zur durchführung dieses verfahrens
DE29509816U1 (de) 1995-06-16 1995-11-02 SC Technology AG, Villmergen Trocknungsanlage
US5935525A (en) * 1995-11-02 1999-08-10 Tri-Mark Corporation Air treatment method and apparatus for reduction of V.O.C.s, NOx, and CO in an air stream
DE19605146A1 (de) * 1996-02-13 1997-08-14 Roediger Anlagenbau Verfahren zum Trocknen einer Substanz
DE19606472C1 (de) * 1996-02-21 1997-07-03 Fritz Egger Ges M B H & Co Verfahren und Vorrichtung zum schnellen Erreichen der Soll-Restfeuchte von Fasergut beim Start einer Durchlauftrocknung
DE19654043C2 (de) * 1996-12-23 1998-05-28 Martin Dipl Ing Knabe Trockner mit Abgasreinigung mittels thermischer Nachverbrennung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0240932A1 *

Also Published As

Publication number Publication date
WO2002040932A1 (fr) 2002-05-23
US20040060198A1 (en) 2004-04-01
DE10056459C1 (de) 2002-04-04
US6931757B2 (en) 2005-08-23

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