EP1775376B1 - Procédé et dispositif pour obtenir des fibres de bois à partir de copeaux de bois - Google Patents

Procédé et dispositif pour obtenir des fibres de bois à partir de copeaux de bois Download PDF

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Publication number
EP1775376B1
EP1775376B1 EP06021281A EP06021281A EP1775376B1 EP 1775376 B1 EP1775376 B1 EP 1775376B1 EP 06021281 A EP06021281 A EP 06021281A EP 06021281 A EP06021281 A EP 06021281A EP 1775376 B1 EP1775376 B1 EP 1775376B1
Authority
EP
European Patent Office
Prior art keywords
wood chips
wood
conductivity
chips
plug
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.)
Not-in-force
Application number
EP06021281A
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German (de)
English (en)
Other versions
EP1775376A2 (fr
EP1775376A3 (fr
Inventor
Wolfgang Dr. Stahl
Klaus Schug
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.)
Glunz AG
Original Assignee
Glunz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glunz AG filed Critical Glunz AG
Priority to PL06021281T priority Critical patent/PL1775376T3/pl
Publication of EP1775376A2 publication Critical patent/EP1775376A2/fr
Publication of EP1775376A3 publication Critical patent/EP1775376A3/fr
Application granted granted Critical
Publication of EP1775376B1 publication Critical patent/EP1775376B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/36—Explosive disintegration by sudden pressure reduction
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices

Definitions

  • the invention relates to a method for recovering wood fibers from wood chips, the wood chips are fed with a plug screw a stove in which they are exposed to elevated pressure and elevated temperature, and wherein the wood chips discharged under rapid release of pressure from the digester and thereby dissolved in the wood fibers. Furthermore, the invention relates to a device for obtaining wood fibers from wood chips with a plug screw, a digester and a discharge device, wherein the plug screw feeds the wood chips to the digester, the wood chips are exposed in the digester elevated pressure and elevated temperature and wherein the discharge device the woodchips discharges from the cooker with rapid release of pressure so that they dissolve into the wood fibers.
  • the pressure in the digester is suddenly relaxed, dismantle the wood chips into the individual wood fibers.
  • These wood fibers are conveyed through a blown duct by a steam stream produced by the expansion in which they can already be glued with binder before they then enter a dryer in which they are adjusted in a stream of dry hot gas to a desired fiber moisture.
  • the enriched by the excess water vapor gas stream is separated in a separator from the wood fibers, from which the wood fibers are then discharged for the formation of a fiber mat.
  • the invention has for its object to provide a method and apparatus of the type described above such that the fiber moisture content of the wood fibers obtained within narrow limits can be kept constant to date, the average fiber moisture content in the production of wood fiber boards without the risk of too high To be able to increase fiber moisture significantly.
  • the conductivity of the wood chips in the region of a plug from the wood chips at the outlet of the screw plug is measured and used as a control parameter for controlling the further processing of wood chips and / or wood fibers.
  • the conductivity of the wood chips represents a measure of the fiber moisture of the wood fibers, which are still related to the individual wood chips.
  • this measure of the fiber moisture content of the wood fibers in the wood chips in the plug from the wood chips at the outlet of the plug screw can be obtained with sufficient accuracy for subsequent use as a control parameter in the control of further processing of wood chips and / or wood fibers it's a relevant statement in terms of the This is especially true when the plug screw in the region of the graft applies a substantially constant pressure on the woodchips or when measured by the plug screw in the region of the graft on the wood chips measured pressure and at the Use of the measured conductivity of the wood chips as a measure of their fiber moisture in terms of calibration is taken into account. At a certain pressure in the region of the graft, the fiber moisture can be determined relatively accurately from the conductivity of the wood chips in the graft.
  • the new process provides meaningful information about the wood fibers in the wood chips, which determine the fiber moisture content of the wood chips despite their extensive treatment until after the woodchips have been dissolved into the individual wood fibers.
  • this crucial starting point for the fiber moisture of the wood fiber obtained very early in the new process it can be used as a control parameter for all subsequent treatments of the woodchips and the wood fibers in order ultimately to achieve a constant fiber moisture content.
  • a feedforward control is realized, with which the fiber moisture content can be kept within narrower limits with fluctuating input parameters than with the feedback control system known from the prior art.
  • the measured conductivity of the wood chips in the area of a plug from the wood chips can also be used in the sense of a feedback control for the control of preceding steps of the treatment of wood chips.
  • the special feature of the present invention is the feedforward control of the further processing of wood chips and / or wood fibers.
  • the conductivity of the wood chips can be used in the new method of controlling a dryer, with which the fiber moisture content of the wood fibers is set, for example, to a desired level for the production of fiberboard.
  • the dryer can continue to be controlled in response to a measured at its output fiber moisture content of the wood fibers, as was previously the case exclusively in the prior art.
  • the pressure applied by the plug screw in the region of the plug to the wood chips is also measured in order to calibrate the measured conductivity with regard to the fiber moisture corresponding thereto, it is of course possible to monitor the sealing function of the screw plug directly by following this pressure.
  • the conductivity of wood chips can be measured in the new method by directly contacting the plug from the woodchips with measuring electrodes.
  • an indirect conductivity measurement is also possible in which the inductive or capacitive properties of the plug, which depend on the conductivity of the wood chips, are recorded.
  • the plug can be part of a dielectric of a capacitor arrangement or part of the core of a coil arrangement whose alternating current resistance changes with each change in the conductivity of the woodchips.
  • the conductivity is determined as for a single direct measurement via measuring electrodes only for a local area of the circumference of the plug, it is preferred that the Conductivity of the wood chips is measured in several peripheral regions of the graft from the wood chips. Even with a constant fiber moisture content of the wood fibers in the wood chips, it is not to be expected that the fiber moisture of interest can be measured as a constant value which is not subject to fluctuations. Rather, the value measured in each case is also dependent on the electrical contacting of the woodchips and structural inhomogeneities of the graft from the woodchips. It therefore makes sense to obtain as many conductivity measurements as possible for the amount of wood chips each forming a graft. The same applies if this is additionally carried out with regard to the measurement of the pressure in the graft.
  • the device according to the invention has at the outlet of the plug screw a conductivity measuring device for measuring the conductivity of the wood chips in the region of a plug from the wood chips.
  • a conductivity measuring device for measuring the conductivity of the wood chips in the region of a plug from the wood chips.
  • the conductivity measuring device is provided for a direct measurement of the conductivity of the wood chips, a housing of the screw plug having at least one transverse bore, which receives a sealed relative to the housing measuring electrode sealingly.
  • the measuring electrode contacts the plug on the inner circumference of the housing. Any abrasion of the housing affects equally on the measuring electrode.
  • the measuring arrangement thus remains always the same despite an unavoidable abrasion on the inner circumference of the housing.
  • the conductivity measuring device can measure the conductivity between the already mentioned measuring electrode and the housing and / or at least one further measuring electrode. It is important to ensure that the current flowing through the measuring arrangement at a certain voltage actually depends essentially on the conductivity of the wood chips.
  • Preference is given to conductivity measuring devices in the new device, which have a plurality of at least three measuring electrodes distributed over the circumference of the screwing plug in order to also detect the homogeneity of the distribution of the fiber moisture over the respective plug from the woodchips.
  • a pressure measuring device For an additional measurement of a pressure applied by the plug screw in the region of the plug on the wood chips, a pressure measuring device may be provided which has at least one, preferably a plurality of pressure sensors distributed over the circumference thereof at the outlet of the screw plug.
  • a stuffing screw 1 is shown in cross section.
  • a screw conveyor 3 runs around an axis 4, so that a screw spiral 5 of the screw conveyor 3 woodchips 6, which are supplied to the plug screw 2 at its inlet 7 and are not shown here individually, promotes to the right and compressed into a compact plug.
  • the plug from the wood chips 6 serves primarily to seal a cooker 9, the wood chips 6 are fed. In the cooker 9 prevails not only an elevated temperature, but also an increased pressure, which should not escape via the plug screw 2 and against the wood chips 6 must be pressed into the stove 9.
  • a counter-pressure body not shown here for the wood chips 6 is provided, which ensures that the desired plug from the wood chips 6 in the plug screw 2 builds up.
  • excess water with which the woodchips 6 can be watered in a storage container 10 is pressed, so that only the water bound in the wood fibers of the woodchips 6 is present in the region of the graft.
  • This water content, ie the moisture content of the wood chips forming the wood chips 6, is measured by a conductivity measuring device 11.
  • the conductivity meter 11 measures the conductivity of the plug of the woodchips 6 between two electrodes 12 and 13 contacting the plug on the inner periphery 17 of the housing 2 at two spaced apart points.
  • the measured conductivity can be used as a control parameter 14 not only for the cooker 9 as shown here but also for all subsequent devices for further processing
  • a long-term observation of the conductivity of the wood chips 6 in the region of the plug can be used to determine to what extent, despite an inevitable wear of the plug screw 1 both on its housing 2 as well as their screw conveyor 3 is still a complete Abpressung the excess and not bound in the wood fibers water from the wood chips. If this pressure is no longer guaranteed, it is time to replace at least the screw conveyor 3, because then the seal of the stove 9 is no longer ensured.
  • Fig. 1 The measuring arrangement of the conductivity measuring device 11 according to Fig. 1 in which two electrodes 12 and 13 sealingly penetrate the housing 2 in the radial direction, it is necessary that at least the associated portion 15 of the housing is made of electrically non-conductive material or is coated electrically insulating on its inner circumference 17, because otherwise the measuring distance between the Electrodes 12 and 13 would be short-circuited by the housing 2 itself.
  • Fig. 2 outlines another training a measuring distance, which as well as the measuring distance in Fig. 1 remains the same at occurring wear of the housing 2, but does not require a portion 15 of the housing 12 of electrically non-conductive material.
  • the electrically conductive housing 2 wherein the electrode 12 is electrically insulated from the housing 2 by a cylinder jacket insulation 16, which together with the electrode 12 a radially extending to the axis 4 transverse bore 30 in the housing 2 seals.
  • a plurality of electrodes 12, which are distributed over the circumference of the housing 2 of the screw conveyor 1, may be connected to the conductivity measuring device 11.
  • the portion 15 of the housing 2, in which the electrodes 12 are arranged consist of electrically non-conductive material or be provided on its inner circumference 17 with an insulating coating, or for each of the electrodes 12, the measuring arrangement according to Fig. 2 be provided.
  • the conductivity measuring device 11 can scan the individual electrodes 12 or the respective electrodes 12 and / or the associated counterelectrodes, which may be other electrodes 12, in parallel or else sequentially.
  • the conductivity measuring device 11 is according to FIG Fig. 3 also connected to pressure sensors 31.
  • the pressure sensors measure a pressure exerted by the screw conveyor 1 on the wood chips in the region of the electrodes to calibrate the measurement of their fiber moisture based on their conductivity to this pressure.
  • the relationship between the electrical conductivity of woodchips and their fiber moisture is pressure dependent. With a determination of the fiber moisture content from the conductivity Therefore, without consideration of the associated pressure, errors are associated which remain small only at a largely constant pressure of the wood chips in the area of the electrodes 12. On the other hand, taking into account the associated pressure, it is possible to deduce from the measured conductivity very precisely the actual fiber moisture content of the wood fibers in the woodchips.
  • Fig. 4 outlines the production of glued wood fibers 18 for the production 19 of wood fiber boards.
  • the woodchips 6 from the cooker 9 according to Fig. 1 discharged with a discharge device 20, in which the pressure in the interior of the digester 9 is abruptly reduced, so that the woodchips 6 dissolve into individual wood fibers.
  • These wood fibers pass through a blowing passage 21 in a dryer 22. Previously, they are sprayed within the blowing passage 21 with binder 23.
  • the moisture of the wood fibers is adjusted by a stream of hot dry gas.
  • the hot dry gas is prepared in a burner 24 by burning fuel gas 25.
  • the control of the burner 24 is indicated here by a valve 26 which adjusts the amount of hot gas 25 supplied to the burner 24.
  • the adjustment of the valve 26 takes place as a function of the control parameter 14, which is derived from the conductivity of the woodchip chips determined by the conductivity measuring device 11.
  • the control parameter 14 is derived from the conductivity of the woodchip chips determined by the conductivity measuring device 11.
  • the running time of the wood fibers is taken into account by the graft from the woodchips, at which the conductivity is measured, until they enter the dryer 22.
  • the wood fibers pass into a separator 27, where they are separated from the gas flow of the dryer 22 and the excess moisture absorbed by this.
  • the fiber moisture content of the glued wood fibers 18 is measured with a measuring device 28, and from this a further control parameter 29 is determined, which is also used to control the dryer 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (10)

  1. Procédé pour obtenir des fibres de bois à partir de copeaux de bois, les copeaux de bois étant acheminés par une vis d'alimentation sous pression vers un cuiseur, dans lequel ils sont exposés à une pression élevée et à une température élevée, et les copeaux de bois, sous l'effet d'une détente rapide de la pression, étant évacués hors du cuiseur et, de ce fait, étant décomposés en fibres de bois, caractérisé en ce qu'une conductibilité électrique des copeaux de bois (6) est mesurée à la sortie de la vis d'alimentation sous pression (1) dans la zone d'un bouchon formé par les copeaux de bois (6) et est utilisée comme paramètre de commande (14) pour la commande du traitement ultérieur des copeaux de bois (6) et/ou des fibres de bois (18).
  2. Procédé selon la revendication 1, caractérisé en ce que qu'une pression, appliquée sur les copeaux de bois (6) par la vis d'alimentation sous pression (1) dans la zone du bouchon, est mesurée et est prise en compte lors de l'utilisation de la conductibilité des copeaux de bois (6) pour la commande du traitement ultérieur des copeaux de bois (6) et/ou des fibres de bois (18).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la conductibilité des copeaux de bois (6) est utilisée pour la commande d'un sécheur (22), dans lequel est réglée l'humidité des fibres de bois (18).
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les copeaux de bois (6) sont mouillés avant leur acheminement vers le cuiseur (9) et l'eau excédentaire est pressée hors des copeaux de bois dans la vis d'alimentation sous pression (1), avant la mesure de la conductibilité des copeaux de bois (6).
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la conductibilité des copeaux de bois (6) est mesurée dans plusieurs zones périphériques du bouchon.
  6. Dispositif pour obtenir des fibres de bois à partir de copeaux de bois, comportant une vis d'alimentation sous pression, un cuiseur et un dispositif d'évacuation, la vis d'alimentation sous pression acheminant les copeaux de bois vers le cuiseur, lesdits copeaux de bois étant exposés dans le cuiseur à une pression élevée et à une température élevée et ledit dispositif d'évacuation évacuant les copeaux de bois hors du cuiseur sous l'effet d'une détente rapide de la pression, de telle sorte qu'ils se décomposent en fibres de bois, caractérisé en ce qu'un dispositif de mesure de la conductibilité (11) est prévu à la sortie de la vis d'alimentation sous pression (1) pour mesurer une conductibilité électrique des copeaux de bois (6) dans la zone d'un bouchon formé par les copeaux de bois (6).
  7. Dispositif selon la revendication 6, caractérisé en ce qu'un carter (2) de la vis d'alimentation sous pression (1) comporte au moins une forure transversale, dans laquelle est logée de manière étanche une électrode de mesure du dispositif de mesure de la conductibilité (11), laquelle est isolée par rapport au carter (2).
  8. Dispositif selon la revendication 7, caractérisé en ce que le dispositif de mesure de la conductibilité (11) mesure la conductibilité entre l'électrode (12) et le carter (2) et/ou au moins une électrode (12, 13) supplémentaire.
  9. Dispositif selon la revendication 7 ou 8, caractérisé en ce que le dispositif de mesure de la conductibilité (11) comporte, sur le pourtour de la vis d'alimentation sous pression (1), une pluralité d'au moins trois électrodes (12).
  10. Dispositif selon l'une quelconque des revendications 6 à 9, caractérisé en ce qu'à la sortie de la vis d'alimentation sous pression (1), il est prévu, en plus, un dispositif de mesure de la pression (11) pour mesurer une pression appliquée sur les copeaux de bois (6) dans la zone du bouchon par la vis d'alimentation sous pression (1).
EP06021281A 2005-10-13 2006-10-11 Procédé et dispositif pour obtenir des fibres de bois à partir de copeaux de bois Not-in-force EP1775376B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06021281T PL1775376T3 (pl) 2005-10-13 2006-10-11 Sposób i instalacja do uzyskiwania włókien drzewnych ze zrębków

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005048958A DE102005048958B4 (de) 2005-10-13 2005-10-13 Verfahren und Vorrichtung zum Gewinnen von Holzfasern aus Holzhackschnitzeln

Publications (3)

Publication Number Publication Date
EP1775376A2 EP1775376A2 (fr) 2007-04-18
EP1775376A3 EP1775376A3 (fr) 2007-09-05
EP1775376B1 true EP1775376B1 (fr) 2010-05-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06021281A Not-in-force EP1775376B1 (fr) 2005-10-13 2006-10-11 Procédé et dispositif pour obtenir des fibres de bois à partir de copeaux de bois

Country Status (5)

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EP (1) EP1775376B1 (fr)
AT (1) ATE467714T1 (fr)
DE (2) DE102005048958B4 (fr)
PL (1) PL1775376T3 (fr)
PT (1) PT1775376E (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102962876A (zh) * 2012-11-30 2013-03-13 濮阳龙丰纸业有限公司 木片撕裂机的蒸汽装置

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008022841B4 (de) 2008-05-08 2010-03-04 Kronotec Ag Verfahren und Anlage zur Herstellung von Spanplatten
CN101463570B (zh) * 2009-01-12 2012-01-04 广州华新科实业有限公司 螺杆注射式植物纤维蒸汽爆破装置及方法
CA2749184C (fr) * 2009-01-13 2017-07-04 Biogasol Ipr Aps Procede et appareil pour alimentation d'un reacteur de traitement en matiere
CN103451985B (zh) * 2013-08-23 2016-10-05 华南理工大学 植物纤维的多级单螺杆连续式蒸汽爆破装置
ES2733334T3 (es) * 2014-09-19 2019-11-28 Versalis Spa Proceso continuo para tratar una biomasa lignocelulósica
SI3194653T1 (sl) 2014-09-19 2019-08-30 Versalis S.P.A. Kontinuirni postopek za obdelavo lignocelulozne biomase
EP3192626B1 (fr) * 2016-01-12 2018-07-04 SWISS KRONO Tec AG Procede de traitement de copeaux de bois et installation associee

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5262003A (en) * 1991-09-18 1993-11-16 The Black Clawson Company Method and system for defibering paper making materials
AT398587B (de) * 1992-02-04 1994-12-27 Oesterreichische Homogenholz A Einspeiseverfahren
DE19653530C1 (de) * 1996-12-20 1998-07-23 Siemens Ag Verfahren und Vorrichtung zur Prozeßführung und zur Prozeßoptimierung bei der Herstellung von Zellstoff
WO1999028548A1 (fr) * 1997-11-26 1999-06-10 Siemens Aktiengesellschaft Dispositif de commande pour lessiveur fonctionnant en continu pour la production de cellulose

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102962876A (zh) * 2012-11-30 2013-03-13 濮阳龙丰纸业有限公司 木片撕裂机的蒸汽装置

Also Published As

Publication number Publication date
DE102005048958B4 (de) 2007-08-09
EP1775376A2 (fr) 2007-04-18
DE102005048958A1 (de) 2007-04-19
ATE467714T1 (de) 2010-05-15
DE502006006929D1 (de) 2010-06-24
PL1775376T3 (pl) 2010-10-29
EP1775376A3 (fr) 2007-09-05
PT1775376E (pt) 2010-07-06

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