WO2002040932A1 - Verfahren zum aufbereiten faseriger substanzen - Google Patents
Verfahren zum aufbereiten faseriger substanzen Download PDFInfo
- Publication number
- WO2002040932A1 WO2002040932A1 PCT/DE2001/003842 DE0103842W WO0240932A1 WO 2002040932 A1 WO2002040932 A1 WO 2002040932A1 DE 0103842 W DE0103842 W DE 0103842W WO 0240932 A1 WO0240932 A1 WO 0240932A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat exchanger
- fibers
- heated
- vapor
- vapors
- Prior art date
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.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/416,654 US6931757B2 (en) | 2000-11-14 | 2001-10-06 | Method for conditioning fibrous substances |
EP01996713A EP1334323A1 (de) | 2000-11-14 | 2001-10-06 | Verfahren zum aufbereiten faseriger substanzen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10056459A DE10056459C1 (de) | 2000-11-14 | 2000-11-14 | Verfahren zum Aufbereiten faseriger Substanzen |
DE10056459.3 | 2000-11-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002040932A1 true WO2002040932A1 (de) | 2002-05-23 |
Family
ID=7663300
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/003842 WO2002040932A1 (de) | 2000-11-14 | 2001-10-06 | Verfahren zum aufbereiten faseriger substanzen |
Country Status (4)
Country | Link |
---|---|
US (1) | US6931757B2 (de) |
EP (1) | EP1334323A1 (de) |
DE (1) | DE10056459C1 (de) |
WO (1) | WO2002040932A1 (de) |
Families Citing this family (7)
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 (de) * | 2006-04-06 | 2007-10-10 | Swedish Exergy Consulting AB | Trockneranlage. |
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 |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2851923A1 (de) * | 1978-11-30 | 1980-06-04 | Baehre & Greten | Verfahren und vorrichtung zum trocknen von zerfaserten und mit einem bindemittel versetzten hackschnitzeln, holzspaenen u.dgl. |
WO1989011072A1 (en) * | 1988-05-10 | 1989-11-16 | M. Kaindl Holzindustrie | Process for low-emission drying of wood chips |
EP0457203A1 (de) * | 1990-05-18 | 1991-11-21 | SC Technology AG | Verfahren zum emissionsfreien Trocknen einer Substanz in einer Trocknungstrommel |
EP0459603A1 (de) * | 1990-06-01 | 1991-12-04 | Körting Hannover Ag | Verfahren und Anlage zur kontinuierlichen Trocknung von Holzspänen, Holzfasern oder anderen Schüttgütern |
DE4023518A1 (de) * | 1990-07-24 | 1992-03-05 | Fritz Egger Gmbh | Verfahren und anlage zum trocknen von feuchtem gut |
EP0508546A1 (de) * | 1991-04-08 | 1992-10-14 | VandenBroek International B.V. | Trocknungsvorrichtung |
WO1992017744A1 (en) * | 1991-04-05 | 1992-10-15 | Anders Kullendorff | A method and a plant for heat treatment of biological material |
DE29509816U1 (de) * | 1995-06-16 | 1995-11-02 | Sc Technology Ag | Trocknungsanlage |
EP0714006A1 (de) * | 1994-11-24 | 1996-05-29 | W. Kunz AG | Verfahren zum Trocknen einer Substanz, insbesondere von Holzspänen |
EP0743498A2 (de) * | 1995-05-16 | 1996-11-20 | Andritz-Patentverwaltungs-Gesellschaft m.b.H. | Verfahren zum Trocknen von feuchtem Gut, insbesondere von Holzfasern |
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 |
DE19654043A1 (de) * | 1996-12-23 | 1997-07-03 | Knabe Martin Dipl Ing | Trockner mit Abgasreinigung mittels thermischer Nachverbrennung |
DE19605146A1 (de) * | 1996-02-13 | 1997-08-14 | Roediger Anlagenbau | Verfahren zum Trocknen einer Substanz |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
-
2000
- 2000-11-14 DE DE10056459A patent/DE10056459C1/de not_active Expired - Fee Related
-
2001
- 2001-10-06 WO PCT/DE2001/003842 patent/WO2002040932A1/de not_active Application Discontinuation
- 2001-10-06 US US10/416,654 patent/US6931757B2/en not_active Expired - Fee Related
- 2001-10-06 EP EP01996713A patent/EP1334323A1/de not_active Withdrawn
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2851923A1 (de) * | 1978-11-30 | 1980-06-04 | Baehre & Greten | Verfahren und vorrichtung zum trocknen von zerfaserten und mit einem bindemittel versetzten hackschnitzeln, holzspaenen u.dgl. |
WO1989011072A1 (en) * | 1988-05-10 | 1989-11-16 | M. Kaindl Holzindustrie | Process for low-emission drying of wood chips |
EP0457203A1 (de) * | 1990-05-18 | 1991-11-21 | SC Technology AG | Verfahren zum emissionsfreien Trocknen einer Substanz in einer Trocknungstrommel |
EP0459603A1 (de) * | 1990-06-01 | 1991-12-04 | Körting Hannover Ag | Verfahren und Anlage zur kontinuierlichen Trocknung von Holzspänen, Holzfasern oder anderen Schüttgütern |
DE4023518A1 (de) * | 1990-07-24 | 1992-03-05 | Fritz Egger Gmbh | Verfahren und anlage zum trocknen von feuchtem gut |
WO1992017744A1 (en) * | 1991-04-05 | 1992-10-15 | Anders Kullendorff | A method and a plant for heat treatment of biological material |
EP0508546A1 (de) * | 1991-04-08 | 1992-10-14 | VandenBroek International B.V. | Trocknungsvorrichtung |
EP0714006A1 (de) * | 1994-11-24 | 1996-05-29 | W. Kunz AG | Verfahren zum Trocknen einer Substanz, insbesondere von Holzspänen |
EP0743498A2 (de) * | 1995-05-16 | 1996-11-20 | Andritz-Patentverwaltungs-Gesellschaft m.b.H. | Verfahren zum Trocknen von feuchtem Gut, insbesondere von Holzfasern |
DE29509816U1 (de) * | 1995-06-16 | 1995-11-02 | Sc Technology Ag | Trocknungsanlage |
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 |
DE19654043A1 (de) * | 1996-12-23 | 1997-07-03 | Knabe Martin Dipl Ing | Trockner mit Abgasreinigung mittels thermischer Nachverbrennung |
Also Published As
Publication number | Publication date |
---|---|
EP1334323A1 (de) | 2003-08-13 |
US6931757B2 (en) | 2005-08-23 |
DE10056459C1 (de) | 2002-04-04 |
US20040060198A1 (en) | 2004-04-01 |
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