EP0823870B1 - Process for producing wood fibres - Google Patents

Process for producing wood fibres Download PDF

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Publication number
EP0823870B1
EP0823870B1 EP96907997A EP96907997A EP0823870B1 EP 0823870 B1 EP0823870 B1 EP 0823870B1 EP 96907997 A EP96907997 A EP 96907997A EP 96907997 A EP96907997 A EP 96907997A EP 0823870 B1 EP0823870 B1 EP 0823870B1
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Prior art keywords
wood
steam
hot steam
per
order
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German (de)
French (fr)
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EP0823870A1 (en
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Klaus E. Radzimanowski
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Schenkmann and Piel Verfahrenstechnik GmbH and Co KG
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Schenkmann and Piel Verfahrenstechnik GmbH and Co KG
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    • 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 method for producing Fiberboard made of wood fibers, with the crushed wood particles as a wood chips treatment with saturated steam under pressure and Temperature exposure to reduce the binding force be subjected to the wood binders treated in this way Wood chips in a mill for the extraction of wood fibers be crushed, the saturated steam fiber mixture underneath Drying and admixing a glue-like binder first separator or a separator group to separate the Wood fibers are fed from the gaseous medium and the separated wood fibers, if necessary with additional admixture a gaseous medium and implementation further process steps such as bunkering, sifting and / or Separation of the wood fibers from the medium in a second Separator for the production of the fiberboard of a form and Press line are fed.
  • glued fibreboard In contrast to pressboard, glued fibreboard has made of wood fibers much better strength values, larger ones Homogeneity and improved machinability.
  • the wood fibers are used for the production of the fiberboard obtained so that raw wood in one Chopper is crushed into so-called wood chips.
  • the wood chips are in one mill standing under saturated steam and the actual ones Fibers obtained in the form of thin and fine threads.
  • the saturated steam / fiber mixture is then piped blown into a so-called current dryer, where, if necessary while reducing the treatment pressure, more fluid Glue is injected and the wet steam with hot air from for example 170 ° C is mixed.
  • Cools by absorbing the steam components of the wet steam the mixed air while drying the wood fibers relatively strongly, with a vapor-air mixture at about 40 ° relative humidity and a dew point of approx. 50 ° C sets.
  • This comparatively dry mixture compared to wet steam then becomes one or more cyclones for separation of the wood fibers obtained.
  • warm air is blown off while the heavier fibers be carried out below.
  • the fibers obtained in this way can now, if necessary, by performing further process steps, a molding and press line are fed, in which the Fiberboard can be produced by curing the glue.
  • the invention has for its object a generic To create manufacturing process in which the energy consumption is reduced.
  • This object is achieved in that the Saturated steam fiber mixture for drying and conveying superheated steam is added.
  • saturated steam or wet steam or saturated steam a vapor state corresponding to the Wet steam area of the known steam tables.
  • unsaturated steam which is able to absorb further steam and on the wet steam area borders.
  • the measure according to the invention can initially be based on the Supply of dry hot air to the saturated steam / fiber mixture be dispensed with, since the non-saturated which is now mixed Superheated steam to dry the saturated steam / fiber mixture in able and also the transport of the mixture in the pipelines can take over.
  • the first separator Since the superheated steam is now under pressure, it is required the first separator as a pressure-resistant cyclone to train. This cyclone is separated from the fibers after vaporous medium removed from the superheated steam and fed to a distributor from where it differs in an energy-saving manner Usages can be supplied.
  • the amount and the state variables of the according to claim 1 supplied superheated steam is preferably chosen so that the initially saturated steam completely into the superheated steam state is transferred.
  • the remaining, possibly still existing excess energy can be used in a further partial flow for domestic water heating, Building heating or be used for other heating purposes.
  • the invention is based on a schematic process diagram for example.
  • the pressurized saturated steam-wood fiber mixture is then via a pipeline 4 working as a cyclone first separator 5 fed where the wood fibers from the medium be separated.
  • Glue can be mixed into the pipeline 4, which in the Steamed wood fibers encased and over a feed 7 with the help of a fan 8 in the pipeline 4 superheated steam is injected, which is used to overheat a heat exchanger 9 has gone through.
  • the state variables of the superheated steam supplied and its Amount are chosen so that the saturated steam while drying the Wood chips are converted into superheated steam.
  • the superheated superheated steam which coexists with the glue Wood fibers is fed to the first separator 5, leaves it still overheated and arrives into a distribution chamber 10, where several partial volume flows are removed can be.
  • the largest partial volume flow I is the already mentioned heat exchanger 9 supplied, there superheated and, as already described, by means of the fan 8 blown into the pipeline 4.
  • a second partial volume flow II is via a pipeline 11 fed to the chipper 1 and serves to preheat the wood chips.
  • the fiber material deposited in the first separator 5 becomes then handed over to an air classifier 12 in the coarser one Wooden components or lumps of glue are separated and as so-called heavy goods are removed from the process.
  • the air required for wind sifting is controlled using a Fan 13 fed to a heat exchanger 14, the Heat exchanger 14 by means of a third partial volume flow III, which is taken from the distribution chamber 10, with heat for air preheating is supplied.
  • a fourth partial flow IV directly the heated air blown into the air classifier 12 fed and serves to increase the air humidity in the air classifier 12. Because of this, the temperature of the sighted Wood fibers are increased.
  • the air-wood fiber mixture After passing through the air classifier 12, the air-wood fiber mixture by means of a fan 15 a second separator 16 supplied, which leaves the heated air as exhaust air, while the separated wood fibers removed as useful goods and their further processing in a molding and press line can be supplied.
  • a further partial volume flow V can be carried out with the appropriate energy supply the process of the distribution chamber 10 removed and for example for hall heating or domestic water heating be used.
  • One or more of the partial volume flows labeled with Roman numerals can one in the described method Wet scrubber, not shown, are fed where accumulating Impurities can be removed.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (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

PCT No. PCT/DE96/00569 Sec. 371 Date Oct. 31, 1997 Sec. 102(e) Date Oct. 31, 1997 PCT Filed Mar. 26, 1996 PCT Pub. No. WO96/34726 PCT Pub. Date Nov. 7, 1996In order to save energy and reduce the exhaust air volume in the production of wood fibers from wood chips, it is proposed to add unsaturated hot steam to the saturated steam used to plasticize the timber binders and soften the wood fibers in a closed-cycle process.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von Faserplatten aus Holzfasern, bei dem zerkleinerte Holzpartikel als Hackschnitzel einer Behandlung mit Sattdampf unter Druck- und Temperaturbeaufschlagung zur Reduzierung der Bindekraft der holzeigenen Bindemittel unterworfen werden, die derart behandelten Hackschnitzel in einer Mühle zur Gewinnung der Holzfasern zerkleinert werden, das Sattdampf-Fasergemisch unter Trocknung und Zumischung eines leimartigen Bindemittels einem ersten Abscheider oder einer Abscheidergruppe zur Trennung der Holzfasern vom gasförmigen Fördermedium zugeführt wird und die abgeschiedenen Holzfasern gegebenenfalls unter erneuter Zumischung eines gasförmigen Fördermediums und Durchführung weiterer Verfahrensschritte wie Bunkerung, Sichtung und/oder Abscheidung der Holzfasern aus dem Fördermedium in einem zweiten Abscheider zur Herstellung der Faserplatten einer Form- und Pressenstraße zugeführt werden.The invention relates to a method for producing Fiberboard made of wood fibers, with the crushed wood particles as a wood chips treatment with saturated steam under pressure and Temperature exposure to reduce the binding force be subjected to the wood binders treated in this way Wood chips in a mill for the extraction of wood fibers be crushed, the saturated steam fiber mixture underneath Drying and admixing a glue-like binder first separator or a separator group to separate the Wood fibers are fed from the gaseous medium and the separated wood fibers, if necessary with additional admixture a gaseous medium and implementation further process steps such as bunkering, sifting and / or Separation of the wood fibers from the medium in a second Separator for the production of the fiberboard of a form and Press line are fed.

Im Gegensatz zu Preßspanplatten weisen verleimte Faserplatten aus Holzfasern wesentlich bessere Festigkeitswerte, größere Homogenität und eine verbesserte Bearbeitbarkeit auf.In contrast to pressboard, glued fibreboard has made of wood fibers much better strength values, larger ones Homogeneity and improved machinability.

Nach dem Stand der Technik werden die Holzfasern zur Herstellung der Faserplatten derart gewonnen, daß Rohholz in einem Hacker zu sogenannten Hackschnitzeln zerkleinert wird.According to the state of the art, the wood fibers are used for the production of the fiberboard obtained so that raw wood in one Chopper is crushed into so-called wood chips.

Diese Hackschnitzel werden, eventuell nach einer Vorwärmung, anschließend einer Sattdampf-Behandlung unterworfen, wobei der Sattdampf einen Druck zwischen etwa 7 und 10 bar und eine Temperatur von etwa 140 bis 170° C aufweist. Durch diesen Dämpfungsprozeß werden die natürlichen holzeigenen Bindemittel wie Harze oder Lignin plastifiziert, wodurch ihre Bindungskraft reduziert wird. Gleichzeitig werden die eingebundenen Holzfasern bei diesem Dämpfungsprozeß erweicht.These chips, possibly after preheating, then subjected to saturated steam treatment, the Saturated steam a pressure between about 7 and 10 bar and a Has temperature of about 140 to 170 ° C. Through this The natural wood binders become damping processes such as resins or lignin plasticized, increasing their binding power is reduced. At the same time, the involved Wood fibers softened in this damping process.

Nach dieser Vorbehandlung werden die Hackschnitzel in einer unter Sattdampf stehenden Mühle zerfasert und die eigentlichen Fasern in Form von dünnen und feinen Fäden gewonnen.After this pretreatment, the wood chips are in one mill standing under saturated steam and the actual ones Fibers obtained in the form of thin and fine threads.

Das Sattdampf-Fasergemisch wird anschließend über Rohrleitungen in einen sogenannten Stromtrockner eingeblasen, wo, gegebenenfalls unter Reduzierung des Behandlungsdruckes, flüssiger Leim eingespritzt wird und der Naßdampf mit heißer Luft von zum Beispiel 170° C vermischt wird.The saturated steam / fiber mixture is then piped blown into a so-called current dryer, where, if necessary while reducing the treatment pressure, more fluid Glue is injected and the wet steam with hot air from for example 170 ° C is mixed.

Durch die Aufnahme der Dampfbestandteile des Naßdampfes kühlt sich die zugemischte Luft unter Trocknung der Holzfasern relativ stark ab, wobei sich ein Dampf-Luftgemisch mit etwa 40° relativer Luftfeuchtigkeit und einem Taupunkt von ca. 50° C einstellt.Cools by absorbing the steam components of the wet steam the mixed air while drying the wood fibers relatively strongly, with a vapor-air mixture at about 40 ° relative humidity and a dew point of approx. 50 ° C sets.

Dieses gegenüber dem Naßdampf vergleichsweise trockene Gemisch wird anschließend einem oder mehreren Zyklonen zur Abscheidung der gewonnenen Holzfasern zugeführt. Im Abscheider wird die warme Luft nach außen abgeblasen, während die schwereren Fasern unten ausgetragen werden.This comparatively dry mixture compared to wet steam then becomes one or more cyclones for separation of the wood fibers obtained. In the separator warm air is blown off while the heavier fibers be carried out below.

Die auf diese Art und Weise gewonnenen Fasern können nun, gegebenenfalls unter Durchführung weiterer Verfahrensschritte, einer Form- und Pressenstraße zugeführt werden, in der die Faserplatten unter Aushärtung des Leimes hergestellt werden.The fibers obtained in this way can now, if necessary, by performing further process steps, a molding and press line are fed, in which the Fiberboard can be produced by curing the glue.

Als weitere Behandlungsschritte für die Holzfasern kommen beispielsweise ihre Bunkerung, eine Sichtung mit Hilfe eines Windsichters und eine erneute Abscheidung in einem nach dem Sichter angeordneten Abscheider in Frage.As further treatment steps for the wood fibers come for example their bunkering, a sighting with the help of a Air classifier and redeposition in one after Separators arranged in a separator in question.

Aufgrund des erforderlichen hohen Volumenstromes an Heißluft ist der bekannte Herstellungsprozeß sehr energieaufwendig, zumal die als Fördermedium dienende Luft nach dem ersten Abscheider als Abluft ins Freie geblasen wird, wobei hier gegebenenfalls die Notwendigkeit besteht, staubförmige oder giftige Bestandteile der Abluft mit Hilfe von aufwendigen Filteranlagen herauszufiltern. Due to the high volume flow of hot air required the known manufacturing process is very energy-intensive, especially the air serving as the pumping medium after the first separator is blown into the open air as exhaust air, where necessary there is a need for dusty or toxic Components of the exhaust air with the help of complex filter systems filter out.

Bei diesem Verfahren kühlt sich das Abgas so stark ab, daß eine Energieausnutzung des verbleibenden Wärmeinhaltes in den meisten Fällen nicht mehr sinnvoll ist.In this process, the exhaust gas cools down so much that an energy utilization of the remaining heat content in the is no longer useful in most cases.

Aus diesem Grunde müssen bei dem beschriebenen Herstellungsprozeß zusätzliche Energiequellen vorgesehen werden, die zum Beispiel für die Vorwärmung der Hackschnitzel oder die Vorwärmung der Sichterluft sorgen.For this reason, in the manufacturing process described additional energy sources are provided, which for Example of preheating the wood chips or preheating the classifier air.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Herstellungsverfahren zu schaffen, bei dem der Energieverbrauch vermindert ist.The invention has for its object a generic To create manufacturing process in which the energy consumption is reduced.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß dem Sattdampf-Fasergemisch zur Trocknung und Förderung Heißdampf zugemischt wird.This object is achieved in that the Saturated steam fiber mixture for drying and conveying superheated steam is added.

Im Sinne dieser Patentanmeldung wird als Sattdampf bzw. Naßdampf oder gesättigter Dampf ein Dampfzustand entsprechend dem Naßdampfgebiet der bekannten Dampftafeln bezeichnet. Als Heißdampf bzw. überhitzter Dampf wird ungesättigter Dampf bezeichnet, der zur Aufnahme weiteren Dampfes in der Lage ist und an das Naßdampfgebiet angrenzt.In the sense of this patent application is called saturated steam or wet steam or saturated steam a vapor state corresponding to the Wet steam area of the known steam tables. As superheated steam or superheated steam is called unsaturated steam, which is able to absorb further steam and on the wet steam area borders.

Durch die erfindungsgemäße Maßnahme kann zunächst auf die Zuführung von trockener Heißluft zum Sattdampf-Fasergemisch verzichtet werden, da der nunmehr zugemischte nicht gesättigte Heißdampf zu einer Trocknung des Sattdampf-Fasergemisches in der Lage ist und auch den Transport des Gemisches in den Rohrleitungen übernehmen kann.The measure according to the invention can initially be based on the Supply of dry hot air to the saturated steam / fiber mixture be dispensed with, since the non-saturated which is now mixed Superheated steam to dry the saturated steam / fiber mixture in able and also the transport of the mixture in the pipelines can take over.

Da der nunmehr entstehende Heißdampf unter Druck steht, ist es erforderlich, den ersten Abscheider als druckfesten Zyklon auszubilden. Diesem Zyklon wird nach Trennung der Fasern vom dampfförmigen Fördermedium der überhitzte Dampf entnommen und einem Verteiler zugeführt, von wo aus er energiesparend unterschiedlichen Nutzungen zugeführt werden kann. Since the superheated steam is now under pressure, it is required the first separator as a pressure-resistant cyclone to train. This cyclone is separated from the fibers after vaporous medium removed from the superheated steam and fed to a distributor from where it differs in an energy-saving manner Usages can be supplied.

Die Menge und die Zustandsgrößen des gemäß Patentanspruchs 1 zugeführten Heißdampfes ist vorzugsweise so gewählt, daß der zunächst vorliegende Sattdampf vollständig in den Heißdampfzustand überführt wird.The amount and the state variables of the according to claim 1 supplied superheated steam is preferably chosen so that the initially saturated steam completely into the superheated steam state is transferred.

Aufgrund der Überführung des bisher offenen Prozesses in einen geschlossenen Kreislauf entstehen auf diese Weise keine Abgasmengen nach dem ersten Abscheider mehr, die aufwendig und unter Energieverlust gereinigt werden müssen. Vielmehr wird aus der Verteilerkammer ein Großteil des Heißdampfes unter erneuter Überhitzung in einem Wärmetauscher mittels eines Ventilators dem Sattdampf-Fasergemisch zugeführt, wo er unter Trocknung des entsprechenden Gemisches auch dessen Förderung übernimmt.Due to the transfer of the previously open process into one In this way, no exhaust gases are generated in a closed circuit after the first separator, the more complex and need to be cleaned with loss of energy. Rather it will most of the superheated steam from under the distribution chamber renewed overheating in a heat exchanger by means of a Fan fed to the saturated steam-fiber mixture, where it is under Drying the corresponding mixture and its promotion takes over.

Aufgrund der im Wärmetauscher zugeführten Energie kann ein weiterer Teilvolumenstrom des Heißdampfes erfindungsgemäß zum Beispiel zur Vorwärmung der Hackschnitzel entnommen werden, so daß sich auch hier eine entsprechende Energieeinsparung ergibt. Ein weiterer Teilvolumenstrom kann, falls erforderlich, zur Vorwärmung der Sichterluft entnommen werden oder der Sichterluft direkt zugemischt werden, wobei der Feuchtigkeitsgehalt der Luft im Sichter ansteigt, so daß die zu sichtenden Fasern heißer werden und die Verarbeitungszeiten in der Pressenstraße entsprechend verkürzt sind.Due to the energy supplied in the heat exchanger, a further partial volume flow of the superheated steam according to the invention for Example for preheating the wood chips can be taken, see above that there is also a corresponding energy saving here. Another partial volume flow can, if necessary, to preheat the classifier air or the classifier air can be mixed directly, the moisture content the air in the sifter rises, so that the ones to be sifted Fibers get hotter and processing times in the press line are shortened accordingly.

Die restliche, eventuell noch vorhandene überschüssige Energie kann in einem weiteren Teilstrom zur Brauchwassererwärmung, Gebäudeheizung oder für sonstige Heizzwecke verwendet werden.The remaining, possibly still existing excess energy can be used in a further partial flow for domestic water heating, Building heating or be used for other heating purposes.

Die Erfindung wird anhand eines schematischen Prozeßschaubildes beispielsweise veranschaulicht.The invention is based on a schematic process diagram for example.

Zur Erzeugung von Holzfasern zur Herstellung von Faserplatten wird zunächst Rohholz in einem Hacker 1 zerkleinert und die erzeugten Hackschnitzel einem Autoklaven 2 zugeführt. Im Inneren des Autoklaven 2 erfolgt eine satzweise Behandlung der Hackschnitzel mit Sattdampf bei einem Druck von ca. 8 bar und einer Temperatur von ca. 150° C. Durch die Dampfbehandlung werden die holzeigenen Bindemittel plastifiziert und die Holzfasern erweicht.For the production of wood fibers for the production of fiberboard raw wood is first crushed in a chipper 1 and the generated wood chips an autoclave 2 fed. Internally the autoclave 2 is treated in batches Wood chips with saturated steam at a pressure of approx. 8 bar and a temperature of approx. 150 ° C. By steam treatment the wood binders are plasticized and the wood fibers softens.

Nach der Dämpfung der Hackschnitzel werden diese einer ebenfalls unter Sattdampf stehenden Mühle 3 zugeführt, in der die erweichten Schnitzel mit Hilfe von geeigneten Mahlaggregaten zerfasert und die feinen Holzfasern freigelegt werden.After the wood chips are damped, they also become one mill 3 fed under saturated steam, in which the soften schnitzel with the help of suitable grinding units frayed and the fine wood fibers are exposed.

Das unter Druck stehende Sattdampf-Holzfasergemisch wird anschließend über eine Rohrleitung 4 einem als Zyklon arbeitenden ersten Abscheider 5 zugeführt, wo die Holzfasern vom Fördermedium getrennt werden.The pressurized saturated steam-wood fiber mixture is then via a pipeline 4 working as a cyclone first separator 5 fed where the wood fibers from the medium be separated.

Zuvor kann mittels einer Zuleitung 6 hinter der Mühle 3 flüssiger Leim in die Rohrleitung 4 eingemischt werden, der die im Sattdampf geförderten Holzfasern ummantelt und über eine Zuführung 7 mit Hilfe eines Ventilators 8 in die Rohrleitung 4 überhitzter Dampf eingeblasen, der zur Überhitzung einen Wärmetauscher 9 durchlaufen hat.Beforehand, it can be more fluid behind the mill 3 by means of a feed line 6 Glue can be mixed into the pipeline 4, which in the Steamed wood fibers encased and over a feed 7 with the help of a fan 8 in the pipeline 4 superheated steam is injected, which is used to overheat a heat exchanger 9 has gone through.

Die Zustandsgrößen des zugeführten Heißdampfes und dessen Menge werden so gewählt, daß der Sattdampf unter Trocknung der Holzschnitzel im überhitzten Heißdampf umgewandelt wird.The state variables of the superheated steam supplied and its Amount are chosen so that the saturated steam while drying the Wood chips are converted into superheated steam.

Der überhitzte Heißdampf, der gleichzeitig mit den leimummantelten Holzfasern dem ersten Abscheider 5 zugeführt wird, verläßt diesen in immer noch überhitztem Zustand und gelangt in eine Verteilerkammer 10, wo mehrere Teilvolumenströme entnommen werden können. Der größte Teilvolumenstrom I wird dem bereits erwähnten Wärmetauscher 9 zugeführt, dort hoch überhitzt und, wie bereits beschrieben, mittels des Ventilators 8 in die Rohrleitung 4 eingeblasen.The superheated superheated steam, which coexists with the glue Wood fibers is fed to the first separator 5, leaves it still overheated and arrives into a distribution chamber 10, where several partial volume flows are removed can be. The largest partial volume flow I is the already mentioned heat exchanger 9 supplied, there superheated and, as already described, by means of the fan 8 blown into the pipeline 4.

Ein zweiter Teilvolumenstrom II wird über eine Rohrleitung 11 dem Hacker 1 zugeführt und dient zur Vorwärmung der Hackschnitzel. A second partial volume flow II is via a pipeline 11 fed to the chipper 1 and serves to preheat the wood chips.

Das im ersten Abscheider 5 abgeschiedene Fasermaterial wird anschließend an einen Windsichter 12 übergeben, in dem gröbere Holzbestandteile oder Leimklumpen abgetrennt werden und als sogenanntes Schwergut aus dem Prozeß entfernt werden.The fiber material deposited in the first separator 5 becomes then handed over to an air classifier 12 in the coarser one Wooden components or lumps of glue are separated and as so-called heavy goods are removed from the process.

Die zur Windsichtung erforderliche Luft wird mittels eines Ventilators 13 einem wärmetauscher 14 zugeführt, wobei der Wärmetauscher 14 mittels eines dritten Teilvolumenstromes III, der der Verteilerkammer 10 entnommen wird, mit Wärme zur Luftvorwärmung versorgt wird. Ein vierter Teilvolumenstrom IV wird direkt der in den Windsichter 12 eingeblasenen erwärmten Luft zugeführt und dient zur Anhebung der Luftfeuchtigkeit im Windsichter 12. Aus diesem Grunde kann die Temperatur der gesichteten Holzfasern erhöht werden.The air required for wind sifting is controlled using a Fan 13 fed to a heat exchanger 14, the Heat exchanger 14 by means of a third partial volume flow III, which is taken from the distribution chamber 10, with heat for air preheating is supplied. A fourth partial flow IV directly the heated air blown into the air classifier 12 fed and serves to increase the air humidity in the air classifier 12. Because of this, the temperature of the sighted Wood fibers are increased.

Nach Durchlaufen des Windsichters 12 wird das Luft-Holzfaser-Gemisch mittels eines Ventilators 15 einem zweiten Abscheider 16 zugeführt, den die erwärmte Luft als Abluft verläßt, während die abgetrennten Holzfasern als Nutzgut entnommen und ihrer weiteren Verarbeitung in einer Form- und Pressenstraße zugeführt werden können.After passing through the air classifier 12, the air-wood fiber mixture by means of a fan 15 a second separator 16 supplied, which leaves the heated air as exhaust air, while the separated wood fibers removed as useful goods and their further processing in a molding and press line can be supplied.

Ein weiterer Teilvolumenstrom V kann bei entsprechender Energieführung des Prozesses der Verteilerkammer 10 entnommen werden und beispielsweise zur Hallenheizung oder Brauchwassererhitzung verwendet werden.A further partial volume flow V can be carried out with the appropriate energy supply the process of the distribution chamber 10 removed and for example for hall heating or domestic water heating be used.

Ein oder mehrere der mit römischen Ziffern bezeichneten Teilvolumenströme können bei dem beschriebenen Verfahren einem nicht dargestellten Naßwäscher zugeführt werden, wo sich anreichernde Verunreinigungen entfernt werden können.One or more of the partial volume flows labeled with Roman numerals can one in the described method Wet scrubber, not shown, are fed where accumulating Impurities can be removed.

Mit dem oben beschriebenen Verfahren sind gegenüber dem bekannten Stand der Technik Energieeinsparungen von überschlägig 50 Prozent möglich. With the method described above are compared to the known State of the art energy savings of approximate 50 percent possible.

BezugszeichenlisteReference list

11
Hackerhacker
22nd
AutoklavAutoclave
33rd
MühleMill
44th
RohrleitungPipeline
55
erster Abscheiderfirst separator
66
ZuleitungSupply
77
ZuführungFeed
88th
Ventilatorfan
99
WärmetauscherHeat exchanger
1010th
VerteilerkammerDistribution chamber
1111
RohrleitungPipeline
1212th
WindsichterAir classifier
1313
Ventilatorfan
1414
WärmetauscherHeat exchanger
1515
Ventilatorfan
1616
zweiter Abscheidersecond separator

Claims (7)

  1. Process for producing fibreboard from wood fibres, in which comminuted wood particles in the form of wood chips are treated with saturated steam under the application of pressure and heat in order to reduce the binding strength of the timber binders, the wood chips treated in this manner are comminuted in a mill to obtain wood fibres, the saturated steam/fibre mixture is fed to a first separator or separator group to separate the wood fibres from the gaseous transport medium while undergoing drying and the admixing of a glue-like binder, and the separated wood fibres are, possibly following the renewed admixing of a gaseous transport medium and additional processing steps, such as bin storage, sifting and/or separation of the wood fibres from the transport medium in a second separator, fed to a moulding and pressing line for production of the fibreboard, characterised in that hot steam is added to the saturated steam/fibre mixture for drying and transportation.
  2. Process as per Claim 1, characterised in that the saturated steam is converted to the hot steam state by the addition of hot steam.
  3. Process as per Claim 1 or 2, characterised in that, downstream of the first separator (5), the hot steam is fed to a distributor chamber (10), from which at least one partial flow I, which is superheated in a heat exchanger (9), is extracted in order to be returned to the saturated steam/fibre mixture.
  4. Process as per Claim 3, characterised in that a partial flow II of the hot steam is extracted from the distributor chamber (10) in order to preheat the wood chips.
  5. Process as per one of Claims 3 or 4, characterised in that a partial flow III of the hot steam is extracted from the distributor chamber (10) in order to preheat the sifter air.
  6. Process as per one of Claims 3 to 5, characterised in that a partial flow IV of the hot steam is extracted from the distributor chamber (10) in order to be mixed with the sifter air.
  7. Process as per one of Claims 3 to 6, characterised in that a partial flow V of the hot steam is extracted from the distributor chamber (10) in order to heat the process water or the building, or fed to other heat exchangers.
EP96907997A 1995-05-03 1996-03-26 Process for producing wood fibres Expired - Lifetime EP0823870B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19515734A DE19515734A1 (en) 1995-05-03 1995-05-03 Process for the production of wood fibers
DE19515734 1995-05-03
PCT/DE1996/000569 WO1996034726A1 (en) 1995-05-03 1996-03-26 Process for producing wood fibres

Publications (2)

Publication Number Publication Date
EP0823870A1 EP0823870A1 (en) 1998-02-18
EP0823870B1 true EP0823870B1 (en) 1999-02-17

Family

ID=7760651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96907997A Expired - Lifetime EP0823870B1 (en) 1995-05-03 1996-03-26 Process for producing wood fibres

Country Status (7)

Country Link
US (1) US6113821A (en)
EP (1) EP0823870B1 (en)
AT (1) ATE176768T1 (en)
AU (1) AU698294B2 (en)
DE (2) DE19515734A1 (en)
ES (1) ES2129958T3 (en)
WO (1) WO1996034726A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005039842A1 (en) 2003-10-07 2005-05-06 Schenkmann-Piel Engineering-Gmbh Method for preparing fiberboards from wood fibers

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL184356B1 (en) 1996-04-12 2002-10-31 Marlit Ltd Method of obtaining composite lignocellulose materials
GB9625068D0 (en) * 1996-12-02 1997-01-22 Marlit Ltd Method for production of lignocellulosic composite materials
ATE244626T1 (en) 1996-12-09 2003-07-15 Plato Internat Technology B V METHOD FOR PRODUCING CELLULOSE FIBER ASSEMBLY
EP1812762A1 (en) * 2004-10-22 2007-08-01 Force Technology Method and device for drying a flow of biomass particles
DE102010034763B3 (en) * 2010-08-18 2011-12-22 Kronotec Ag Process and plant for the treatment of wood for the production of medium density fibreboard
US20160169581A1 (en) * 2013-07-25 2016-06-16 Kotyk Energy Ag Biomass-processing device and method

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US2872337A (en) * 1953-12-30 1959-02-03 Weyerhaeuser Timber Co Method of coating a felted fibrous mat
DE1199977B (en) * 1956-06-28 1965-09-02 Weyerhaeuser Timber Company Method and device for the treatment of non-decomposed wood fibers or other cellulose-containing fibers obtained in the dry process with a thermosetting binder and drying of the fibers from their hot pressing to form molded bodies
SE413784B (en) * 1976-08-06 1980-06-23 Isel Sa SET AND DEVICE TO USE IN DEFIBRATION ZONE DEVELOPED HEAT TO MINIMIZE CONSUMPTION WHEN PREPARING MASS FOR FIBER DISC
DE3609506A1 (en) * 1985-03-25 1986-10-30 Koppers Co., Inc., Pittsburgh, Pa. Process for producing a composition from cellulose particles and resin for the production of fibre boards
US4855179A (en) * 1987-07-29 1989-08-08 Arco Chemical Technology, Inc. Production of nonwoven fibrous articles
DE3728123A1 (en) * 1987-08-22 1989-03-02 Hoechst Ag METHOD FOR THE PRODUCTION OF FRINGED CELLULOSE MATERIAL, IN PARTICULAR WOOD FIBERS, FOR THE PRODUCTION OF FIBER PANELS
DE4122842C2 (en) * 1991-07-10 1993-11-18 Glunz Ag Process for the production of fiberboard from lumpy wood particles and isocyanate as a binder
SE9302993L (en) * 1993-09-15 1995-03-13 Sunds Defibrator Ind Ab Manufacture of 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005039842A1 (en) 2003-10-07 2005-05-06 Schenkmann-Piel Engineering-Gmbh Method for preparing fiberboards from wood fibers

Also Published As

Publication number Publication date
EP0823870A1 (en) 1998-02-18
WO1996034726A1 (en) 1996-11-07
ATE176768T1 (en) 1999-03-15
AU698294B2 (en) 1998-10-29
DE59601315D1 (en) 1999-03-25
US6113821A (en) 2000-09-05
AU5141796A (en) 1996-11-21
DE19515734A1 (en) 1996-11-07
ES2129958T3 (en) 1999-06-16

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