WO2003106123A2 - Procede et dispositif pour le traitement thermique d'objets en bois - Google Patents

Procede et dispositif pour le traitement thermique d'objets en bois Download PDF

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Publication number
WO2003106123A2
WO2003106123A2 PCT/DK2003/000368 DK0300368W WO03106123A2 WO 2003106123 A2 WO2003106123 A2 WO 2003106123A2 DK 0300368 W DK0300368 W DK 0300368W WO 03106123 A2 WO03106123 A2 WO 03106123A2
Authority
WO
WIPO (PCT)
Prior art keywords
autoclave
wooden objects
heat treatment
pressure
objects
Prior art date
Application number
PCT/DK2003/000368
Other languages
English (en)
Other versions
WO2003106123A3 (fr
Inventor
Erik Skovmand
Peter Christensen
Original Assignee
Iwotech A/S
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 Iwotech A/S filed Critical Iwotech A/S
Priority to AU2003234971A priority Critical patent/AU2003234971A1/en
Publication of WO2003106123A2 publication Critical patent/WO2003106123A2/fr
Publication of WO2003106123A3 publication Critical patent/WO2003106123A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/006—Separating volatiles, e.g. recovering solvents from dryer exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a method for heat treatment of wooden objects as stated in the introductory portion of claim 1.
  • the invention also relates to a system for heat treatment of wooden objects by means of this method, as stated in the introductory portion of claim 5.
  • Wooden objects may also be pressure-impregnated to give them better properties, to make them less sensitive to moisture, or to prolong their service life.
  • Heat treatment may take place by heating in open spaces, but small closed compartments, such as autoclaves, are frequently used, in which the objects are arranged stacked and with gaps between the individual objects. This reduces the consumption of heat, and the objects may be pressurized or be subjected to vacuum, which may be expedient in certain connections.
  • steam is used for the heat treatment of wood.
  • the steam may be saturated and have a temperature of about 100 degrees.
  • a known system for heat treatment of wooden objects in particular with a view to fixation after pressure impregnation, is described in PCT application no. WO 90/06840.
  • the system comprises an autoclave in which the wooden objects are arranged stacked on carriages.
  • the autoclave is in communication with a container for condensate which is generated during the heat treatment, and has means for the supply of hot, saturated steam.
  • the autoclave is evacuated completely, or as much as possible, as the heat transfer from the steam may take place more rapidly when there is no air in the autoclave. Therefore, steam at a relatively low temperature may be used.
  • This effect is brought about by the fact that the glucose or sugar substances in the wood are released and form a layer around the cells of the wood which so to speak hardens on the cell walls, such that the cells are less susceptible to ingress of moisture.
  • the object of the invention is to provide a method for heat treatment of wooden objects wherein it is possible to use high temperatures without risking that the wood carbonizes and is thereby discoloured. This is achieved by the method which is defined in claim 1.
  • Claim 3 defines an expedient way of performing the heat treatment at this high temperature. When the temperature is so high, neither the heating nor the subsequent cooling may take place too suddenly. Cooling expediently takes place in the manner stated in claim 4, viz. by blowing air into the stack of wooden objects from below.
  • the invention also relates to a system as stated in claim 5 for performing the method of claims 1 - 4.
  • the low pressure of 100 mb is provided without problems with an ordinary vacuum pump, in contrast to what is the case if the vacuum is to be complete, as is the case in the above-mentioned prior art.
  • the condensate container itself which is in communication with the auto- clave, may expediently be connected with a storage container to which the condensate may be supplied for later use, as stated in claim 7.
  • the condensate, which occurs at the high temperatures, may contain substances, such as turpentine, which it may be useful to collect.
  • the wooden objects in the stack may be clamped together and/or be clamped so that they do not warp during the heat treatment with the high temperatures, as stated in claim 8.
  • wooden objects 1 are introduced into an autoclave 2.
  • the autoclave 2 When the autoclave 2 is closed, it is evacuated to a suitable negative pressure or vacuum by means of a form of a vacuum pump 3. This evacuation generates a so- called pre-vacuum whereby some oxygen is removed from the autoclave 2, so that the risk of carbonization during treatment is reduced considerably.
  • CO 2 in gas form may be supplied after the evacuation to counteract carbonization.
  • the actual heating takes place in that steam is supplied to the autoclave 2, during which supply the temperature is controlled automatically via a computer (not shown).
  • the heating thus follows a predetermined curve with temperature increase and time.
  • the heating may e.g. be set to between 160 °C and 230 °C, preferably 210 °C.
  • the steam which condenses on the wood 1 , is fed to a container 4 for the collection of condensate 5.
  • This container or tank 4 which, like the autoclave 2, is also under pressure, may be emptied automatically by means of one or more float devices (not shown) as well as by means of the pressure existing in the container.
  • the system may also comprise a further storage tank 6 for the storage of condensate 5 prior to further pumping.
  • the condensate 5 may subsequently be neutralized and/or pumped from an outlet 7 to an impregnation system (not shown) for mixing with impregnation liquid.
  • the condensate 5 may be passed through a heat exchanger 12, so that the condensate 5 is caused to release its residual heat for use in the heating of the medium for the heat treatment. If it is advantageous in certain cases to heat the condensed liquid or the impregnation liquid before the feeding into the autoclave, this may likewise take place by flow through the heat exchanger 12.
  • the condensate 5 inter alia contains turpentine, which may be separated from the condensate, and the separated turpentine may optionally be used for other purposes.
  • turpentine which may be separated from the condensate, and the separated turpentine may optionally be used for other purposes.
  • One of these purposes may e.g. be to use the turpen- tine completely or partly as a fuel for the heating of the medium for the heat treatment.
  • the medium for heating the autoclave 2 is supplied to the system at 8, and the cooled medium is returned to the heating system (not shown) in the form of condensate at 9.
  • the time period which the wooden objects are to stay in the autoclave during heating and cooling is adjusted, optionally via automatics, on the basis of a predetermined course (program) in view of the dimensions of the objects and the wood species or type concerned.
  • the pressure in the autoclave is neutralized slowly to prevent bursting in the wood, as the cells of the wooden objects will be burst by the outflowing residual moisture/air in case of too rapid equalization.
  • the pressure from which equalization takes place may e.g. be of the order of 10-29 bars, which pressure is present in the autoclave as well as in the cells of the wood. . .
  • cooling takes place according to a predetermined temperature and time curve. Cooling takes place in that air, preferably at normal room temperature, is blown through the stack of wood from below and upwards by means of a cooling blower 10, whereby the heat and the steam are blown into the atmosphere via a steam chimney 11. Residual heat, if any, from the autoclave may be discharged via the steam chimney 11 or be passed through a heat exchanger 12 to thereby recover part of the energy which was spent on heating the medium to steam.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne un procédé de traitement thermique d'objets en bois (1) dans un autoclave (2), sous pression et/ou vide, de préférence à une pression proche de celle de la vapeur saturée, et de manière à pouvoir réduire la quantité d'oxygène dans l'autoclave (2) avant le traitement thermique. On peut ajouter ultérieurement une forme de gaz de protection pour réduire la carbonisation des objets en bois (1). L'invention concerne également un système de traitement d'objets en bois (1) dans un espace chauffé constitué d'un autoclave (2) relié à un système de pression (3), pour le réglage de la pression dans le système, et relié aussi à un contenant de condensat (4). Il existe en outre un égaliseur de pression dans l'autoclave et une unité de serrage des objets en bois et/ou de serrage des objets en bois entre eux, pour éviter l'éclatement ou la torsion durant ou après le traitement.
PCT/DK2003/000368 2002-06-07 2003-06-06 Procede et dispositif pour le traitement thermique d'objets en bois WO2003106123A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003234971A AU2003234971A1 (en) 2002-06-07 2003-06-06 A method and an apparatus for heat treatment of wooden objects

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200200872 2002-06-07
DK200200872A DK200200872A (da) 2002-06-07 2002-06-07 Varmebehandling af træ med damp

Publications (2)

Publication Number Publication Date
WO2003106123A2 true WO2003106123A2 (fr) 2003-12-24
WO2003106123A3 WO2003106123A3 (fr) 2009-03-26

Family

ID=29724337

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2003/000368 WO2003106123A2 (fr) 2002-06-07 2003-06-06 Procede et dispositif pour le traitement thermique d'objets en bois

Country Status (3)

Country Link
AU (1) AU2003234971A1 (fr)
DK (1) DK200200872A (fr)
WO (1) WO2003106123A2 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1026135C2 (nl) * 2004-05-06 2005-11-11 Konink Boogaerdt B V Werkwijze voor het vervaardigen van een houten dek, en houten latten bestemd voor gebruik bij dit dek.
DE102009047137A1 (de) 2009-11-25 2011-05-26 Institut Für Holztechnologie Dresden Gemeinnützige Gmbh Verfahren zur thermischen Modifizierung oder Vergütung von Holz und Holzprodukten
CN103868343A (zh) * 2012-12-17 2014-06-18 南通海辰蛋白科技有限公司 一种蒸气脱湿塔
CN105806075A (zh) * 2016-04-22 2016-07-27 成都聚智工业设计有限公司 真空干燥混合装置
WO2018220367A1 (fr) * 2017-05-31 2018-12-06 The Leeds And Bradford Boiler Company Limited Système d'autoclave et procédé
CN116061278A (zh) * 2022-11-24 2023-05-05 湖北萨莱玛木结构工程有限公司 一种建筑木质结构的胀缩控制设备
CN116086164A (zh) * 2022-12-12 2023-05-09 国网浙江省电力有限公司营销服务中心 一种基于聚类的竹木片烘干室温湿度均匀控制方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044221A1 (de) * 1980-11-25 1982-06-03 Rütgerswerke AG, 6000 Frankfurt Verfahren zur dimensionsstabilisierung von pressverdichteten holzwerkstoffen
WO1990006840A1 (fr) * 1988-12-16 1990-06-28 Steen Ole Moldrup Procede et appareil pour chauffer du bois ou d'autres matieres sensibles a la deshydratation et a la chaleur
DE4222178A1 (de) * 1992-07-06 1994-01-13 Werzalit Ag & Co Vorrichtung zur Vorbehandlung von lignozellulosehaltigen Spänen
NL9201265A (nl) * 1992-07-14 1994-02-01 Foreco Dalfsen B V Inrichting voor het voorverwarmen van hout.
EP0956934A1 (fr) * 1998-05-12 1999-11-17 Rhone Poulenc Agro Protection du bois par des arylpyrazoles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044221A1 (de) * 1980-11-25 1982-06-03 Rütgerswerke AG, 6000 Frankfurt Verfahren zur dimensionsstabilisierung von pressverdichteten holzwerkstoffen
WO1990006840A1 (fr) * 1988-12-16 1990-06-28 Steen Ole Moldrup Procede et appareil pour chauffer du bois ou d'autres matieres sensibles a la deshydratation et a la chaleur
DE4222178A1 (de) * 1992-07-06 1994-01-13 Werzalit Ag & Co Vorrichtung zur Vorbehandlung von lignozellulosehaltigen Spänen
NL9201265A (nl) * 1992-07-14 1994-02-01 Foreco Dalfsen B V Inrichting voor het voorverwarmen van hout.
EP0956934A1 (fr) * 1998-05-12 1999-11-17 Rhone Poulenc Agro Protection du bois par des arylpyrazoles

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1026135C2 (nl) * 2004-05-06 2005-11-11 Konink Boogaerdt B V Werkwijze voor het vervaardigen van een houten dek, en houten latten bestemd voor gebruik bij dit dek.
WO2005108033A1 (fr) * 2004-05-06 2005-11-17 Koninklijke Boogaerdt B.V. Procede de preservation du bois, terrasse et madriers destines a etre utilises avec la terrasse
DE102009047137A1 (de) 2009-11-25 2011-05-26 Institut Für Holztechnologie Dresden Gemeinnützige Gmbh Verfahren zur thermischen Modifizierung oder Vergütung von Holz und Holzprodukten
CN103868343A (zh) * 2012-12-17 2014-06-18 南通海辰蛋白科技有限公司 一种蒸气脱湿塔
CN105806075A (zh) * 2016-04-22 2016-07-27 成都聚智工业设计有限公司 真空干燥混合装置
WO2018220367A1 (fr) * 2017-05-31 2018-12-06 The Leeds And Bradford Boiler Company Limited Système d'autoclave et procédé
CN110944739A (zh) * 2017-05-31 2020-03-31 利兹及布拉德福德锅炉有限公司 高压釜系统及方法
GB2565402B (en) * 2017-05-31 2020-06-24 The Leeds And Bradford Boiler Company Ltd Autoclave System and Method of Operating an Autoclave System
US11666878B2 (en) 2017-05-31 2023-06-06 The Leeds And Bradford Boiler Company Limited Autoclave system and method
CN116061278A (zh) * 2022-11-24 2023-05-05 湖北萨莱玛木结构工程有限公司 一种建筑木质结构的胀缩控制设备
CN116086164A (zh) * 2022-12-12 2023-05-09 国网浙江省电力有限公司营销服务中心 一种基于聚类的竹木片烘干室温湿度均匀控制方法

Also Published As

Publication number Publication date
WO2003106123A3 (fr) 2009-03-26
AU2003234971A8 (en) 2009-04-23
DK200200872A (da) 2003-12-08
AU2003234971A1 (en) 2003-12-31

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