EP1314943A1 - Procédé pour traiter des substances fibreuses - Google Patents

Procédé pour traiter des substances fibreuses Download PDF

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Publication number
EP1314943A1
EP1314943A1 EP02023350A EP02023350A EP1314943A1 EP 1314943 A1 EP1314943 A1 EP 1314943A1 EP 02023350 A EP02023350 A EP 02023350A EP 02023350 A EP02023350 A EP 02023350A EP 1314943 A1 EP1314943 A1 EP 1314943A1
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EP
European Patent Office
Prior art keywords
heat exchanger
combustion chamber
hot gas
gas
circuit
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Withdrawn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
EP02023350A
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German (de)
English (en)
Inventor
Timon Dr.-Ing. 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
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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 EP1314943A1 publication Critical patent/EP1314943A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • F26B23/028—Heating arrangements using combustion heating using solid fuel; burning the dried product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a method for processing fibrous substances, in particular of wood fibers, which are dried in a dryer, by the in a substantially closed drying cycle a steam-gas mixture as circulating gas (hereinafter "vapors"), which after passing through the dryer in a separator from the dried fibers and then into a first heat exchanger connected to the drying circuit is routed back.
  • vapors steam-gas mixture as circulating gas
  • DE 196 54 043 A1 allows a thermal dryer for bulk goods such as e.g. Remove wood chips.
  • a rotary drum dryer and a own furnace to generate the necessary drying heat, but without that the combustion gases are fed directly to the rotary drum dryer.
  • At least one gas / gas heat exchanger is provided, which emits the combustion gases Removes heat.
  • a vapor cycle is also provided, which Drying apparatus and a recirculation for vapors emerging from this back to the point of entry, with a consequence of the vapor cycle the drying of the excess partial flow taking place in the drying apparatus the vapors are withdrawn and fed to the furnace as secondary air, where at Temperatures of at least 800 ° C the organic pollutants contained largely burned.
  • the gas / gas heat exchanger arrangement transmits the heat extracted from the combustion exhaust gases is transferred to that in the vapor circuit Vapors flowing into the dryer inlet, which are then returned to the dryer enter and serve as a drying agent while cooling. Intended is also an air preheater, which after the combustion gases after they have passed through the gas / gas heat exchanger for heating the vapor, extracts additional heat and transfers it to fresh air, which is fed to the dryer becomes.
  • the gas / gas heat exchanger arrangement additionally arranged at least one heat exchanger as a heater, which flows through the cooling exhaust gases that cool down on the heating side is generated and thereby either steam on the cooling side or a flowing through on the cooling side liquid heat transfer medium high volume specific Heat capacity is heated, being in the drying apparatus for its additional heating after the vapor-heated drying section at least as a heating register a heat exchanger is arranged on its heating side with heat emission Steam condenses or a liquid heat transfer medium of high volume-specific Heat capacity cools down.
  • the dryer is on the cooling side in addition to the previous heating by vapors, additional heat is supplied, whereby the heater and the heating register form a heating medium circuit.
  • the invention has for its object a particularly energetically improved To develop processing methods for fibrous substances.
  • combustion of the solid fuel is also initiated Combustion air generates hot gas through the first gas-gas heat exchanger flows and the brothers are heated.
  • the heated brothers enter the preferably designed as a flow tube dryer in which the Gas flow wet wood fibers are added by the thermal energy of the gas stream are dried.
  • solid substances expelled from the solid accumulate Fluids as vapor in the gas stream.
  • This gas-vapor mixture will then together with the dried fibers in a downstream of the dryer, preferably promoted as a cyclone separator, where the dried wood fibers separated by centrifugal force and out be removed from the process.
  • Coupled-off vapor partial flow is converted into a thermal vapor treatment Hot gas generator fed, in its combustion chamber, the combustible ingredients of this vapor partial flow are burned.
  • This thermally cleaned Gas is together with the combustion exhaust gases from the furnace of the hot gas generator discharged into the atmosphere from a chimney as exhaust air.
  • Solid fuels are waste materials, possibly from our own wood-based material production, used.
  • the feeding of solid fuels into the The combustion chamber of the hot gas generator can be speed controlled via a dosing screw take place, the hot gas generation by the fuel supply speed can be controlled.
  • the vapor partial stream to form a rotating one Flow is introduced tangentially into the combustion chamber. This will create a achieved intensive mixing with the hot gases, resulting in the thermal treatment of vapors and a high reduction rate are guaranteed. Therefore the secondary air is preferably introduced tangentially into the combustion chamber.
  • An intensive mixing of the hot gases with the vapors can be done by using are supported by flow control devices, which also before entry provided in the heat exchanger downstream of the hot gas generator be able to ensure its even exposure to flue gas.
  • That generated by the combustion of solids and possibly dust Hot gas is primarily used for the thermal treatment of the vapors.
  • the Excess energy is extracted in the downstream heat exchanger.
  • the outcoupled vapor partial flow before its heating in the second heat exchanger is cooled in a vapor condenser and thus depleted and the resulting condensate is discharged become.
  • the condensate trap particularly reduces energy consumption the reheating of the remaining vapors.
  • the vapor is decoupled according to the invention temperature-controlled with the aim of optimal gas-gas combustion and emission reduction. Through emission-related regulation of Temperature of the discharged vapors is possible in each Operating point to minimize the emission.
  • a short dwell time can be achieved by using a flow tube dryer of the fibers reach a size of 2-10 seconds. This will the fiber material is dried in the flow tube dryer in the fluidized state and can't "bake".
  • the process temperatures are in the tube dryer always above the water boiling point between 100 ° C and 350 ° C.
  • the Drying with superheated steam reduces the risk of over-drying as the fibers be moistened at the beginning. This will counteract the heat transfer conventional drying increased; this has a shorter drying time result.
  • Propellant steam is fed into the flow tube dryer, which settles in the dryer Realize considerably higher temperature levels compared to conventional processes leaves.
  • the from the drying cycle excreted dried fibers in a downstream gluing be glued. It is advantageous if the dried fibers in a largely closed glue air circuit can be fed in, pass through a glue wetting zone and downstream in one of these Separators are separated from the circulating transport air.
  • FIG. 1 the part of the plant relating to drying is marked I and that for gluing designated plant part with II.
  • Drying I comprises an essentially closed drying cycle 1, through which a steam-gas mixture acted upon by a fan 2 circulated as circulating gas, hereinafter referred to as vapors.
  • a drying circuit 1 On Section of this drying circuit 1 is designed as a flow tube dryer 3, in the wet fibers 4 and motive steam in the order of about 30 50% of the mass flow can be fed.
  • the fibers become after going through the flow tube dryer 3 in a separator 5 connected downstream thereof, which is preferably a cyclone separator, separated from the vapor and as dry fibers 6 discharged.
  • the vapors are put in a drying cycle 1 switched first heat exchanger 7 and passed back through it, to then flow again through the flow tube dryer 3.
  • a partial flow 8 of the vapor is decoupled in a vapor condenser 9 cooled and thus depleted, in a subordinate second heat exchanger 10 reheated and then into the combustion chamber 11a a hot gas generator 11 initiated and burned there.
  • the combustion chamber 11a has a connection for feeding solid fuels 12 and a connection for feeding in combustion air 13.
  • the condensate 14 obtained in the vapor condenser 9 becomes from the condenser fed and e.g. for propellant steam generation in one for fiber production used refiner and / or as preparation water for fiber gluing used.
  • the combustion exhaust gases generated in the combustion chamber 11a act together a first hot gas circuit with the thermally cleaned vapor partial flow 15, which is guided through the first heat exchanger 7. acted is also a second hot gas circuit 16 through the second heat exchanger 10 is performed. Subsequently, this is done by applying the two Hot gas circuits 15, 16 cooled exhaust gas 17 from a chimney 18 as exhaust air 19 directed into the atmosphere.
  • the vapor extraction is temperature controlled.
  • the vapor decoupling and the reheating of the depleted partial vapor stream freely programmed controlled by one of a freely programmable Control PLC controlled control valve 20 for the vapor partial flow to be coupled out 8 and by a controlled control valve 21 in the inlet of the second Heat exchanger 10.
  • the following process temperatures are in the illustrated embodiment entered: At the inlet of the current tube dryer 3 there will be a temperature of 300 - 350 ° C and at the dryer outlet a temperature of about 120 - 130 ° C to adjust.
  • the vapors circulated are therefore in the first heat exchanger 7 heated from the low temperature mentioned to 300-350 ° C.
  • the combustion gases from the Combustion chamber 11a reach a temperature of approx. 900 ° C and cool down then after charging the two hot gas circuits 15, 16 to approx. 160 ° C from.
  • 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 largely become one closed glue air circuit 22 fed through a Glue wetting zone 23, in which glue 27 is injected, and are in one this downstream separator 24 from the circulating transport air separated.
  • the one from the separator 24, which is preferably a cyclone separator is exiting glued fibers 25 are further processing fed.
  • the transport speed of the fibers passing through the glue wetting zone 23 is between 20 and 35 m / s, preferably about 27 m / s.
  • the temperature the transport air is around 40 - 60 ° C.
  • the glue-air circuit 22 receives false air 26 via an air discharge removed and as additional combustion air into the combustion chamber 11a of the Hot gas generator 11 fed.
  • FIG. 2 shows an embodiment for a hot gas generator 11, the one Heat exchanger 28 is connected downstream for the first hot gas circuit 15.
  • the Combustion chamber 11a is closed at the bottom by a grate 29, which is for receiving the fixed speed-fed via a dosing screw 30 Fuels 12 is used.
  • the grate 29 serves as a holding system for the solid fuels 12, which fall as small particles through the grate 29 during burning and from one e.g. Discharge system 31 also formed by a dosing screw are discharged as ash 32.
  • a feed for the decoupled Vapor partial stream 8 is provided, which may be mixed with secondary air can be.
  • a feed is in the clear distance above the solid fuels 12 for dusty fuels 33, e.g. via nozzles into the Combustion chamber 11a is blown in and burned here. Before that, the dusty fuels 33 e.g. mixed with secondary air in a dust burner.
  • FIG. 3 shows that the vapor partial stream 8 forms a rotating one Flow is introduced tangentially into the combustion chamber 11a.
  • the combustion air too 13 can be introduced tangentially into the combustion chamber 11a. to Achieving these rotating flows can additionally flow guide devices be used.
  • a flow guide device 34 is indicated in FIG. for an even application of the first hot gas circuit 15 should provide with flue gas.
EP02023350A 2001-11-23 2002-10-18 Procédé pour traiter des substances fibreuses Withdrawn EP1314943A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10157596 2001-11-23
DE2001157596 DE10157596C1 (de) 2001-11-23 2001-11-23 Verfahren zum Aufbereiten faseriger Substanzen

Publications (1)

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EP1314943A1 true EP1314943A1 (fr) 2003-05-28

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EP02023350A Withdrawn EP1314943A1 (fr) 2001-11-23 2002-10-18 Procédé pour traiter des substances fibreuses

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EP (1) EP1314943A1 (fr)
DE (1) DE10157596C1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE520939T1 (de) * 2008-01-10 2011-09-15 Douglas Technical Ltd Verfahren zur kontinuierlichen trocknung von schüttgut, insbesondere von holzfasern und/oder holzspänen
PT2230477E (pt) * 2009-03-10 2015-03-04 Kronotec Ag Instalação de secagem de aparas de madeira para secagem de aparas de madeira e processo associado de secagem de aparas de madeira

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147115A (en) * 1977-09-14 1979-04-03 Leppert Alfred M Incinerator with gas generation
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
FR2472139A1 (fr) * 1979-12-19 1981-06-26 Vernon Generateur de gaz chauds et son utilisation pour fournir des calories a un appareil utilisateur tel que four, sechoir, chaudiere
US4351251A (en) * 1981-06-29 1982-09-28 Mechtron International Corp. Combustion apparatus
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
EP0457203A1 (fr) * 1990-05-18 1991-11-21 SC Technology AG Procédé de séchage sans À©missions d'une substance dans un tambour de séchage
EP0459603A1 (fr) * 1990-06-01 1991-12-04 Körting Hannover Ag Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac
EP0508546A1 (fr) * 1991-04-08 1992-10-14 VandenBroek International B.V. Dispositif de séchage
WO1992017744A1 (fr) * 1991-04-05 1992-10-15 Anders Kullendorff Procede et installation de traitement thermique d'une matiere biologique
EP0714006A1 (fr) * 1994-11-24 1996-05-29 W. Kunz AG Procédé de séchage d'une substance, en particulier de copeaux de bois
DE19654043A1 (de) 1996-12-23 1997-07-03 Knabe Martin Dipl Ing Trockner mit Abgasreinigung mittels thermischer Nachverbrennung
DE19635360A1 (de) * 1996-08-22 1998-02-26 Kim Hong Gi Verfahren zum Verbrennen von feuchten Massen, insbesondere Klärschlamm
US6116898A (en) * 1998-09-16 2000-09-12 Frechette; Gaston Oven having built-in gas biasing means
DE10056459C1 (de) * 2000-11-14 2002-04-04 Fraunhofer Ges Forschung Verfahren zum Aufbereiten faseriger Substanzen

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4147115A (en) * 1977-09-14 1979-04-03 Leppert Alfred M Incinerator with gas generation
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
FR2472139A1 (fr) * 1979-12-19 1981-06-26 Vernon Generateur de gaz chauds et son utilisation pour fournir des calories a un appareil utilisateur tel que four, sechoir, chaudiere
US4351251A (en) * 1981-06-29 1982-09-28 Mechtron International Corp. Combustion apparatus
DE4036666A1 (de) * 1989-11-20 1991-05-23 Kurt Gisiger Verfahren und vorrichtung fuer das trocknen von organischen stoffen, insbesondere von holzteilchen
EP0457203A1 (fr) * 1990-05-18 1991-11-21 SC Technology AG Procédé de séchage sans À©missions d'une substance dans un tambour de séchage
EP0459603A1 (fr) * 1990-06-01 1991-12-04 Körting Hannover Ag Procédé et dispositif pour le séchage continu de copeaux de bois, de fibres de bois ou d'autres matières en vrac
WO1992017744A1 (fr) * 1991-04-05 1992-10-15 Anders Kullendorff Procede et installation de traitement thermique d'une matiere biologique
EP0508546A1 (fr) * 1991-04-08 1992-10-14 VandenBroek International B.V. Dispositif de séchage
EP0714006A1 (fr) * 1994-11-24 1996-05-29 W. Kunz AG Procédé de séchage d'une substance, en particulier de copeaux de bois
EP0714006B1 (fr) 1994-11-24 1997-12-29 W. Kunz dryTec AG Procédé de séchage d'une substance, en particulier de copeaux de bois
DE19635360A1 (de) * 1996-08-22 1998-02-26 Kim Hong Gi Verfahren zum Verbrennen von feuchten Massen, insbesondere Klärschlamm
DE19654043A1 (de) 1996-12-23 1997-07-03 Knabe Martin Dipl Ing Trockner mit Abgasreinigung mittels thermischer Nachverbrennung
US6116898A (en) * 1998-09-16 2000-09-12 Frechette; Gaston Oven having built-in gas biasing means
DE10056459C1 (de) * 2000-11-14 2002-04-04 Fraunhofer Ges Forschung Verfahren zum Aufbereiten faseriger Substanzen

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Publication number Publication date
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