EP0823870A1 - Verfahren zur herstellung von holzfasern - Google Patents
Verfahren zur herstellung von holzfasernInfo
- Publication number
- EP0823870A1 EP0823870A1 EP96907997A EP96907997A EP0823870A1 EP 0823870 A1 EP0823870 A1 EP 0823870A1 EP 96907997 A EP96907997 A EP 96907997A EP 96907997 A EP96907997 A EP 96907997A EP 0823870 A1 EP0823870 A1 EP 0823870A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- superheated steam
- steam
- volume flow
- separator
- 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.)
- Granted
Links
- 229920002522 Wood fibre Polymers 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 23
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 24
- 239000002023 wood Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 239000002025 wood fiber Substances 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 7
- 239000011094 fiberboard Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000465 moulding Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 1
- 239000003292 glue Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000011093 chipboard Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- JTJMJGYZQZDUJJ-UHFFFAOYSA-N phencyclidine Chemical class C1CCCCN1C1(C=2C=CC=CC=2)CCCCC1 JTJMJGYZQZDUJJ-UHFFFAOYSA-N 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- F26B17/107—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 pneumatically inducing within the drying enclosure a curved flow path, e.g. circular, spiral, helical; Cyclone or Vortex dryers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/24—Wood particles, e.g. shavings, cuttings, saw dust
Definitions
- the invention relates to a process for the production of fiberboard from wood fibers, in which shredded wood particles as wood chips are subjected to a treatment with saturated steam under pressure and temperature to reduce the binding power of the wood-based binders, the wood chips treated in this way in a mill for extracting the wood fibers are comminuted, the saturated steam / fiber mixture is fed to a first separator or a separator group for separating the wood fibers from the gaseous conveying medium while drying and admixing a glue-like binder, and the separated wood fibers are optionally mixed again with a gaseous conveying medium and further process steps such as bunkering are carried out , Sifting and / or separating the wood fibers from the conveying medium in a second separator for the production of the fiber boards of a molding and press line.
- the wood fibers for the production of the fiberboard are obtained in such a way that raw wood is chopped into so-called wood chips in a chipper.
- These chips are then subjected to a saturated steam treatment, the saturated steam having a pressure between about 7 and 10 bar and a temperature of about 140 to 170 ° C.
- This damping process plasticizes the natural wood binders such as resins or lignin, which reduces their binding power.
- the integrated wood fibers are softened in this damping process.
- the wood chips are in one Mill standing under saturated steam and the actual fibers obtained in the form of thin and fine threads.
- the saturated steam / fiber mixture is then blown in via pipelines into a so-called flow dryer, where liquid glue is injected, if necessary while reducing the treatment pressure, and the wet steam is mixed with hot air of, for example, 170 ° C.
- the mixed air cools relatively strongly while the wood fibers are drying, a steam-air mixture having a relative air humidity of approximately 40 ° and a dew point of approximately 50 ° C. being established.
- This mixture which is comparatively dry compared to wet steam, is then fed to one or more cyclones for the separation of the wood fibers obtained.
- the warm air is blown outwards in the separator, while the heavier fibers are discharged at the bottom.
- the fibers obtained in this way can now, if necessary by carrying out further process steps, be fed to a molding and press line in which the fiberboard is produced by curing the glue.
- Further treatment steps for the wood fibers include, for example, bunkering, sifting with the help of an air classifier and renewed separation in a separator arranged after the classifier.
- the known manufacturing process is very energy-intensive, especially since the air serving as the conveying medium is blown into the air as exhaust air after the first separator, where there may be a need for dusty or toxic components of the exhaust air to filter out with the help of complex filter systems.
- the exhaust gas cools down so much that in most cases it is no longer sensible to use the remaining heat.
- the invention has for its object to provide a generic manufacturing method in which the energy consumption is reduced.
- This object is achieved in that the saturated steam-fiber mixture is mixed for drying and conveying superheated steam.
- saturated steam or wet steam or saturated steam is a steam state corresponding to the wet steam area of the known steam tables.
- Hot steam or superheated steam refers to unsaturated steam which is capable of absorbing further steam and which is adjacent to the wet steam area.
- the supply of dry hot air to the saturated steam / fiber mixture can be dispensed with, since the now unsaturated superheated steam is able to dry the saturated steam / fiber mixture and can also take over the transport of the mixture in the pipelines .
- the first separator Since the superheated steam now being produced is under pressure, it is necessary to design the first separator as a pressure-resistant cyclone. After the fibers have been separated from the vaporous medium, the superheated steam is removed from this cyclone and fed to a distributor, from where it can be fed to different uses in an energy-saving manner.
- the quantity and the state variables of the superheated steam supplied according to claim 1 is preferably selected so that the saturated steam which is initially present is completely converted into the superheated steam state.
- a further partial volume flow of the superheated steam can be removed according to the invention, for example for preheating the wood chips, so that here too there is a corresponding energy saving.
- a further partial volume flow can, if necessary, be taken to preheat the sifter air or be mixed directly into the sifter air, the moisture content of the air in the sifter increasing so that the fibers to be sifted become hotter and the processing times in the press line are shortened accordingly.
- the remaining, possibly still existing excess energy can be used in a further partial flow for domestic water heating, building heating or for other heating purposes.
- the invention is illustrated, for example, with the aid of a schematic process diagram.
- raw wood is first crushed in a chipper 1 and the chips obtained are fed to an autoclave 2.
- the wood chips are treated in batches with saturated steam at a pressure of approximately 8 bar and a temperature of approx. 150 ° C.
- the steam treatment plasticizes the wood binders and softens the wood fibers.
- the wood chips After the wood chips have been steamed, they are fed to a mill 3 which is also under saturated steam, in which the softened chips are defibrated with the aid of suitable grinding units and the fine wood fibers are exposed.
- the pressurized saturated steam-wood fiber mixture is then fed via a pipeline 4 to a first separator 5 working as a cyclone, where the wood fibers are separated from the conveying medium.
- liquid glue can be mixed into the pipeline 4 behind the mill 3 by means of a feed line 6, which glue encapsulates the wood fibers conveyed in saturated steam and via a feed line 7 with the help of a fan 8, superheated steam is blown into the pipeline 4, which leads to Overheating has passed through a heat exchanger 9.
- the state variables of the superheated steam supplied and its amount are selected so that the saturated steam is converted into superheated superheated steam while the wood chips are drying.
- the superheated superheated steam which is fed to the first separator 5 at the same time as the glue-coated wood fibers, leaves the separator 5 while it is still overheated and reaches a distribution chamber 10, where several partial volume flows can be removed.
- the largest partial volume flow I is fed to the already mentioned heat exchanger 9, is superheated there and, as already described, is blown into the pipeline 4 by means of the fan 8.
- a second partial volume flow II is fed to the chipper 1 via a pipeline 11 and serves to preheat the chips.
- the fiber material separated in the first separator 5 is then transferred to an air classifier 12, in which coarser wood components or lumps of glue are separated and removed from the process as so-called heavy goods.
- the air required for air separation is fed to a heat exchanger 14 by means of a fan 13, the heat exchanger 14 being supplied with heat for air preheating by means of a third partial volume flow III, which is taken from the distribution chamber 10.
- a fourth partial volume flow IV is fed directly to the heated air blown into the air classifier 12 and serves to raise the air humidity in the air classifier 12. For this reason, the temperature of the wood fibers sighted can be increased.
- the air-wood fiber mixture After passing through the air classifier 12, the air-wood fiber mixture is fed by means of a fan 15 to a second separator 16, which the heated air leaves as exhaust air, while the separated wood fibers are removed as useful goods and fed to their further processing in a molding and press line can be.
- a further partial volume flow V can be taken from the distribution chamber 10 if the process is appropriately energized and can be used, for example, for hall heating or hot water heating.
- one or more of the partial volume flows denoted by Roman numerals can be fed to a wet scrubber (not shown), where accumulating impurities can be removed.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19515734A DE19515734A1 (de) | 1995-05-03 | 1995-05-03 | Verfahren zur Herstellung von Holzfasern |
DE19515734 | 1995-05-03 | ||
PCT/DE1996/000569 WO1996034726A1 (de) | 1995-05-03 | 1996-03-26 | Verfahren zur herstellung von holzfasern |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0823870A1 true EP0823870A1 (de) | 1998-02-18 |
EP0823870B1 EP0823870B1 (de) | 1999-02-17 |
Family
ID=7760651
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96907997A Expired - Lifetime EP0823870B1 (de) | 1995-05-03 | 1996-03-26 | Verfahren zur herstellung von holzfasern |
Country Status (7)
Country | Link |
---|---|
US (1) | US6113821A (de) |
EP (1) | EP0823870B1 (de) |
AT (1) | ATE176768T1 (de) |
AU (1) | AU698294B2 (de) |
DE (2) | DE19515734A1 (de) |
ES (1) | ES2129958T3 (de) |
WO (1) | WO1996034726A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
PL184356B1 (pl) | 1996-04-12 | 2002-10-31 | Marlit Ltd | Sposób wytwarzania lignocelulozowych materiałów złożonych |
GB9625068D0 (en) * | 1996-12-02 | 1997-01-22 | Marlit Ltd | Method for production of lignocellulosic composite materials |
DE69629038T2 (de) * | 1996-12-09 | 2004-04-22 | Plato International Technology B.V. | Verfahren zur Herstellung von Zellulosefaseraggregaten |
DE10347052A1 (de) | 2003-10-07 | 2005-05-04 | Schenkmann Piel Engineering Gm | Verfahren zur Herstellung von Faserplatten aus Holzfasern |
EP1812762A1 (de) * | 2004-10-22 | 2007-08-01 | Force Technology | Verfahren und vorrichtung zum trocknen eines flusses von biomassenteilchen |
DE102010034763B3 (de) * | 2010-08-18 | 2011-12-22 | Kronotec Ag | Verfahren und Anlage zur Aufbereitung von Holz für die Herstellung mitteldichter Faserplatten |
US20160169581A1 (en) * | 2013-07-25 | 2016-06-16 | Kotyk Energy Ag | Biomass-processing device and method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2872337A (en) * | 1953-12-30 | 1959-02-03 | Weyerhaeuser Timber Co | Method of coating a felted fibrous mat |
DE1199977B (de) * | 1956-06-28 | 1965-09-02 | Weyerhaeuser Timber Company | Verfahren und Vorrichtung zur Behandlung von im Trockenverfahren gewonnenen, nicht auf-geschlossenen Holzfasern oder anderen zellulosehaltigen Fasern mit waermehaertendem Bindemittel und Trocknung der Fasern von ihrer Heisspressung zu Formkoerpern |
SE413784B (sv) * | 1976-08-06 | 1980-06-23 | Isel Sa | Sett och anordning for att utnyttja i defibreringszonen utvecklat verme for att minimera angforbrukningen vid framstellning av massa for fiberskivor |
DE3609506A1 (de) * | 1985-03-25 | 1986-10-30 | Koppers Co., Inc., Pittsburgh, Pa. | Verfahren zum herstellen einer masse aus zelluloseteilchen und harz fuer die herstellung von faserplatten |
US4855179A (en) * | 1987-07-29 | 1989-08-08 | Arco Chemical Technology, Inc. | Production of nonwoven fibrous articles |
DE3728123A1 (de) * | 1987-08-22 | 1989-03-02 | Hoechst Ag | Verfahren zur herstellung von zerfasertem zellulosematerial, insbesondere holzfasern, fuer die herstellung von faserplatten |
DE4122842C2 (de) * | 1991-07-10 | 1993-11-18 | Glunz Ag | Verfahren zur Herstellung von Faserplatten aus stückigen Holzpartikeln und Isocyanat als Bindemittel |
SE501566C2 (sv) * | 1993-09-15 | 1995-03-13 | Sunds Defibrator Ind Ab | Framställning av fiberboard |
US5554330A (en) * | 1995-01-31 | 1996-09-10 | Isoboard Enterprises Inc. | Process for the manufacturing of shaped articles |
US5624616A (en) * | 1995-04-20 | 1997-04-29 | Brooks; S. Hunter W. | Method for co-refining dry urban wood chips and blends of dry urban wood chips and thermoplastic resins for the production of high quality fiberboard products |
US5637326A (en) * | 1995-12-04 | 1997-06-10 | Fuisz Technologies Ltd. | Apparatus for making chopped amorphous fibers with an air transport system |
US5725818A (en) * | 1996-06-28 | 1998-03-10 | Forintek Canada Corp. | Manufacture of hog fuel board |
-
1995
- 1995-05-03 DE DE19515734A patent/DE19515734A1/de not_active Withdrawn
-
1996
- 1996-03-26 AU AU51417/96A patent/AU698294B2/en not_active Ceased
- 1996-03-26 EP EP96907997A patent/EP0823870B1/de not_active Expired - Lifetime
- 1996-03-26 DE DE59601315T patent/DE59601315D1/de not_active Expired - Lifetime
- 1996-03-26 ES ES96907997T patent/ES2129958T3/es not_active Expired - Lifetime
- 1996-03-26 AT AT96907997T patent/ATE176768T1/de active
- 1996-03-26 WO PCT/DE1996/000569 patent/WO1996034726A1/de active IP Right Grant
- 1996-03-26 US US08/945,650 patent/US6113821A/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9634726A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19515734A1 (de) | 1996-11-07 |
DE59601315D1 (de) | 1999-03-25 |
WO1996034726A1 (de) | 1996-11-07 |
ES2129958T3 (es) | 1999-06-16 |
AU5141796A (en) | 1996-11-21 |
US6113821A (en) | 2000-09-05 |
AU698294B2 (en) | 1998-10-29 |
EP0823870B1 (de) | 1999-02-17 |
ATE176768T1 (de) | 1999-03-15 |
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