WO2004042301A1 - Procede pour traiter une charge de matiere ligneuse d'elements empiles, notamment une charge de bois par traitement thermique a haute temperature - Google Patents
Procede pour traiter une charge de matiere ligneuse d'elements empiles, notamment une charge de bois par traitement thermique a haute temperature Download PDFInfo
- Publication number
- WO2004042301A1 WO2004042301A1 PCT/FR2003/002884 FR0302884W WO2004042301A1 WO 2004042301 A1 WO2004042301 A1 WO 2004042301A1 FR 0302884 W FR0302884 W FR 0302884W WO 2004042301 A1 WO2004042301 A1 WO 2004042301A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- load
- enclosure
- treatment
- heat transfer
- 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.)
- Ceased
Links
Classifications
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
-
- 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
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
-
- 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
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
-
- 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 present invention relates to a method for treating a load of woody material composed of stacked elements, in particular a load of wood, by heat treatment at high temperature.
- It relates more particularly to a process for treating wood thermally so that it retains or even reinforces all of its characteristics such as its mechanical, acoustic and insulating properties, as well as its dimensional stability in the presence of moisture.
- a heat treatment makes it possible to eliminate the supports which generate germs and molds.
- This heat treatment also makes it possible to carry out chemical bridging between the macromolecular chains of the wood constituents in a controlled atmosphere and at a minimum temperature of 230 degrees Celsius.
- the main qualities acquired during high temperature treatment are dimensional stability and a markedly increased resistance to aggressiveness, a source of aging and rotting.
- Such a device operates on the principle of a continuous circulation of the heat transfer gas formed by the air stripped of its oxygen and mixed with the combustion gases to provide a neutral atmosphere.
- the heat transfer gas circulates continuously throughout the treatment cycle, from the point where it is heated by the heating means for example at least one burner to the load of woody material to be treated which it crosses at a balanced rate and speed at any point of its circuit while bringing it in a homogeneous manner the calories necessary for the heat treatment.
- the treatment cycle requires several passes of the fluid through the charge.
- the temperature drops in successive stages using a high-pressure cold water spray in the circuit of the heat transfer gas in the overpressure chamber.
- the pressure inside the enclosure is maintained in the treatment zone by the arrival of a neutral gas which compensates for the reduction in the volume of the heat-transfer fluid during this cooling phase.
- the object of the invention is to propose a method for treating a load of woody material composed of stacked elements, in particular a load of wood, by high temperature heat treatment which makes it possible to take into account the behavior of the products at the level of their thermal conductivity and their resistance to releasing their liquid or degradable substances under high temperature.
- the subject of the present invention is a method for treating a load of woody material composed of stacked elements, in particular a load of wood, by high temperature heat treatment using a treatment enclosure which comprises means for conditioning a load of woody material to be treated, this load of woody material delimiting inside said enclosure a first volume, called “overpressure chamber”, located upstream of the load to be treated, and a second volume called
- each of the temperature stages of the treatment cycle is reached by equilibrating the temperature of the overpressure chamber with the temperature of the recovery chamber and said equilibrium is determined according to the following formulas:
- T 1 T2 - ⁇ ° C during the rise in temperature of the treatment cycle
- T2 T1 + ⁇ '° C during the descent in temperature of the treatment cycle where ⁇ and ⁇ ' are temperature constants between 5 and 25 degrees Celsius.
- the constants ⁇ and ⁇ ' are respectively equal to 5 degrees Celsius and 20 degrees Celsius.
- the transition to a level at least equal to 100 degrees Celsius is only authorized if the volume of the enclosure comprises an amount of oxygen of less than 3%.
- the temperature regulation means are triggered until a temperature is detected. average of the chambers below 100 degrees Celsius before authorizing any restart of the treatment cycle.
- the electronic management means of the oven are also connected to computer equipment making it possible to print all of the data from the sensors arranged in the enclosure during a treatment cycle as well as the temperature curves in real time.
- the speed of circulation of the heat transfer fluid is kept constant in the treatment enclosure by controlling said speed and by acting on the flow rate of the means for conveying said heat transfer fluid.
- an enclosure 1 having four vertical walls 2 and a ceiling 3. At least one of the vertical walls 2 of the enclosure is provided with a door 4 allowing the loading of the woody material 5 to be treated .
- This load of woody material 5 consists of wooden planks 6 stacked on each other to substantially form a parallelepiped structure intended to be placed in the enclosure 1.
- the boards 6 are placed so that their length is in the longitudinal direction of the enclosure, and they are spaced from each other by spacers in the form of spacers 7 placed in their transverse direction.
- the thickness of these spacers 7 is defined as a function of the thickness of the woods to be treated, of the dimensions of the load and of the physical parameters of circulation of the fluid in the enclosure 1 and in said load 5.
- the load of woody material to be treated 5 delimits inside the enclosure a first volume 8, called “overpressure chamber”, located upstream of the charge 5, and a second volume 9, called “recovery chamber”, located downstream of the load 5.
- said enclosure 1 is provided as mentioned in patent application FR-A-2 790 698, forming an integral part of the request by reference, means 10 for heating a heat-transfer fluid circulating in said enclosure 1, means for continuous circulation 11 of said heat transfer fluid, means for controlling the temperature and the humidity of the enclosure, means for regulating the temperature and the humidity 12 of the treatment enclosure 1 and sealing means at the top and bottom of the load of material thus avoiding the preferential circuits of the heat transfer fluid out of the load.
- the heating means 10 for the heat transfer fluid comprise at least one gas burner disposed in the upper part of the enclosure 1 in a so-called heating chamber 13 while the means for circulation 11 consist of at least one fan intended to suck the heat transfer fluid into the recovery chamber 9 and draw it into the heating chamber 13.
- the regulation means consist for example of a horizontal boom 12 for high spraying water pressure, located in the overpressure chamber 8. This spraying boom 12 is provided with a plurality of nozzles allowing the spraying of a high-flow mist supplied with cold or chilled water.
- Programmable electronic management means not shown allow management of the temperature variation levels and the humidity level in the treatment enclosure.
- This treatment chamber 1 is advantageously carried out by a method according to the invention consisting in permanently monitoring and measuring the atmosphere prevailing in each of said chambers by the temperature control means and then in comparing the data coming from these means of control in order to act simultaneously and uniformly on the modulation of the power of the heating means 10 and on the possible cooling of the heat-transfer gas by the regulation means 12 thus ensuring the course of a heat treatment cycle, including the temperature levels and the duration have been pre-established and are managed, as a function of the behavior of the load of woody material 5 at the level of its thermal conductivity and a balance of the flow rate and the speed of the heat transfer fluid between the two chambers 8 and 9.
- the rise in temperature can be carried out linearly.
- control means are in particular temperature, pressure, humidity and oxygen analysis sensors arranged in the two chambers 8 and 9 making it possible to establish the release authorizations.
- the level reached during a pre-established processing cycle integrated into the electronic management means is determined by the temperature balance in the two chambers.
- a woody material 5 such as wood having a hygrometry of 12 to 14%.
- Stages are determined for the execution of a treatment cycle comprising a rise in temperature up to 230 degrees Celsius then a controlled fall in temperature as follows:
- the volume of air contained in the treatment enclosure is circulated using the fans, said treatment enclosure being maintained at a pressure higher than atmospheric pressure.
- Samples are taken from said chambers in order to collect data relating in particular to the flow rate and the speed of the heat transfer fluid in the enclosure.
- the circulation of the air volume is ensured until the flow rate and the speed determined between the two chambers 8 and 9 are balanced, thereby ensuring a uniform heat supply in all points of the load of woody material 5.
- the treatment cycle begins by triggering the heating means 10 of the heat transfer fluid.
- the permanent measurement of the oxygen content of the heat transfer fluid in the overpressure chamber 8 as well as the permanent measurement of the carbon dioxide content CO installed in the upper part of the chambers 8 and 9 makes it possible to prohibit the operation of the heating means 10 in if a given concentration of oxygen O or carbon dioxide CO is exceeded.
- the burners 10 reduce their power and if the temperature continues to rise the spray bar 12 comes into action in cold water and then possibly in chilled water.
- the cycle temperature plateau will be reached as mentioned above when the temperature of the overpressure chamber 8 is equal to the temperature of the recovery chamber 9 minus a temperature constant ⁇ preferably equal to 5 degrees Celsius. This level is maintained at its temperature level for the determined duration, in the example one hour, by regulating this temperature by the means described above.
- the electronic management means initiate the temperature rise to the upper level under the same operating conditions, successively until reaching the temperature of 230 degrees Celsius.
- the passage of the plateau of 100 degrees Celsius is preferably subject to the condition that the volume of the enclosure comprises less than 3% of oxygen.
- the oven enclosure is maintained at a pressure of
- said enclosure is provided in a known manner with a calibrated valve allowing the evacuation of the surplus of heat-transfer gas generated by the burners 10.
- the temperature of the enclosure 1 is lowered in stages, by spraying water, cold or refrigerated in the circuit of the heat transfer fluid using the watering ramp. These temperature lowering steps are for example defined as follows 200, 170,
- the transition from one level to another takes place when the equilibrium of the temperature T2 of the recovery chamber 9 is preferably equal to the temperature T1 recorded in the overpressure chamber 8 plus a temperature constant ⁇ 'defined for example at 20 degrees Celsius.
- the electronic management means raise the pressure in the enclosure and compensate for the depression caused by the reduction in the volume of heat-carrying gas by the automatic supply of nitrogen allowing the pressure to be maintained. inside the enclosure.
- the method according to the present invention ensures that in the event of an incident with the heating means when the average temperature of the chambers is greater than 120 degrees Celsius, the enclosure is lowered to similar to what is described above by means of the spray bars, in particular up to an average temperature of the chambers of less than 100 degrees Celsius before authorizing any restart of a treatment cycle.
- the electronic management means of the oven are also connected to computer equipment making it possible to print all the data of the sensors placed in the enclosure during a treatment cycle as well as the temperature curves in real time. It will be noted that to obtain good results in terms of the quality and uniformity of the heat treatment, it is preferable not to mix products of different thicknesses or of different essences in the same load.
- the electronic and computer system acts only as a means of controlling the various security elements, authorizing or not the requested actions and reporting information on the operation of the oven.
- Such a method advantageously makes it possible to treat very different species without having carried out specific programs.
- the operation of such an oven should adapt itself to the requirements of the products, except possibly to affect the temperature and the duration of the bearings.
- the circulation speed of the heat transfer fluid is kept constant in the treatment enclosure and through the charge of woody material by action on the flow rate of the heat transfer fluid drive means.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003285393A AU2003285393A1 (en) | 2002-10-28 | 2003-10-02 | Method for treating a load of stacked ligneous material elements, in particular a load of wood by high-temperature heat treatment |
| EP03778383A EP1558884A1 (fr) | 2002-10-28 | 2003-10-02 | Procede pour traiter une charge de matiere ligneuse d'elements empiles, notamment une charge de bois par traitement thermique a haute temperature |
| JP2004549250A JP2006505423A (ja) | 2002-10-28 | 2003-10-02 | 積層した木質要素を高温熱処理する方法 |
| CA002502370A CA2502370A1 (fr) | 2002-10-28 | 2003-10-02 | Procede pour traiter une charge de matiere ligneuse d'elements empiles, notamment une charge de bois par traitement thermique a haute temperature |
| US10/531,765 US20050284945A1 (en) | 2002-10-28 | 2003-10-02 | Method for treating a load of stacked ligneous material elements, in particular a load of wood by high-temperature heat treatment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0213427A FR2846269B1 (fr) | 2002-10-28 | 2002-10-28 | Procede pour traiter une charge de matiere ligneuse composee d'elements empiles, notamment une charge de bois, par traitement thermique a haute temperature |
| FR0213427 | 2002-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2004042301A1 true WO2004042301A1 (fr) | 2004-05-21 |
| WO2004042301A8 WO2004042301A8 (fr) | 2005-04-28 |
Family
ID=32088307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2003/002884 Ceased WO2004042301A1 (fr) | 2002-10-28 | 2003-10-02 | Procede pour traiter une charge de matiere ligneuse d'elements empiles, notamment une charge de bois par traitement thermique a haute temperature |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20050284945A1 (fr) |
| EP (1) | EP1558884A1 (fr) |
| JP (2) | JP2006505423A (fr) |
| CN (1) | CN1708667A (fr) |
| AU (1) | AU2003285393A1 (fr) |
| CA (1) | CA2502370A1 (fr) |
| FR (1) | FR2846269B1 (fr) |
| WO (1) | WO2004042301A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514865B (zh) * | 2008-02-19 | 2012-05-30 | 刘鼎革 | 立体多层式单板烘干机 |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1748268A3 (fr) * | 2005-07-29 | 2011-11-02 | Josef Walderdorff | Procédé de séchage de produits |
| EP1929229A4 (fr) * | 2005-09-30 | 2014-02-12 | Australian Choice Timber Supplies Pty Ltd | Procede et systeme de regulation d une etuve |
| US20110020568A1 (en) * | 2007-03-28 | 2011-01-27 | Igor Aleksandrovich Danchenko | Method for wood heat treatment and a device for carrying out said method |
| FI20090029A0 (fi) * | 2009-02-02 | 2009-02-02 | Northern Tanker Company Oy | Öljy- ja bitumitankin sisäpuolinen lämpöeristys |
| BRPI0901111F1 (pt) * | 2009-03-05 | 2022-04-05 | Fitolog Controle De Pragas Ltda | Sistema e método para tratamento térmico fitossanitário de embalagens de madeira e similares |
| US8397400B2 (en) * | 2010-05-25 | 2013-03-19 | Forest Research Institute Malaysia | High temperature lumber treatment system |
| CN105643751A (zh) * | 2016-03-07 | 2016-06-08 | 姚莲琴 | 一种木材深度碳化装置 |
| DK179238B1 (en) * | 2016-07-15 | 2018-02-26 | Wtt Holding Aps | A thermo treatment process for wood |
| CN107356059A (zh) * | 2017-06-13 | 2017-11-17 | 安徽温禾新材料科技股份有限公司 | 一种木质地板加工干燥窑 |
| CN110715508A (zh) * | 2019-09-10 | 2020-01-21 | 吴江市松陵电器设备有限公司 | 一种洁净干燥箱 |
| CN113758202B (zh) * | 2021-09-26 | 2022-09-06 | 安徽丰汇木业有限公司 | 用于家具加工的板材烘干设备 |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3744144A (en) * | 1971-04-23 | 1973-07-10 | H Weis | Automated controls for lumber drying kiln |
| US4356641A (en) * | 1980-12-15 | 1982-11-02 | Armstrong World Industries | Kiln control system |
| EP0142071A2 (fr) * | 1983-11-09 | 1985-05-22 | Lignomat GmbH | Procédé pour sécher le bois |
| FR2604245A1 (fr) * | 1986-09-19 | 1988-03-25 | Gautreau Jean Paul | Procede de sechage de produits hygroscopiques de fortes epaisseurs, notamment du bois. |
| US4862599A (en) * | 1987-05-26 | 1989-09-05 | Gesellschaft Fur Messtechnik Mbh | Process and apparatus for drying wood |
| FR2720969A1 (fr) * | 1994-06-14 | 1995-12-15 | Herve Montornes | Procédé de traitement haute température d'un matériau ligno-cellulosique. |
| US5678324A (en) * | 1993-05-12 | 1997-10-21 | Valtion Teknillinen Tutkimuskeskus | Method for improving biodegradation resistance and dimensional stability of cellulosic products |
| FR2757097A1 (fr) * | 1996-12-13 | 1998-06-19 | Bci | Dispositif et procede de traitement a haute temperature de materiau ligno-cellulosique |
| FR2790698A1 (fr) | 1999-03-09 | 2000-09-15 | Jean Laurencot | Dispositif pour le traitement thermique a haute temperature d'une matiere ligneuse |
| US20010015020A1 (en) * | 2000-02-04 | 2001-08-23 | Wood Drying Research | Method and apparatus for drying wood |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3131034A (en) * | 1961-03-02 | 1964-04-28 | Marsh Julius Everett | Process for drying lumber |
| DE2916677A1 (de) * | 1979-04-25 | 1980-11-06 | Ruetgerswerke Ag | Verfahren zur verguetung von holz |
| FR2512053B1 (fr) * | 1981-08-28 | 1985-08-02 | Armines | Procede de transformation de matiere ligneuse d'origine vegetale et matiere d'origine vegetale ligneuse transformee par torrefaction |
| US4686121A (en) * | 1986-03-17 | 1987-08-11 | Environmental Air Contractors, Inc. | Treating apparatus and method |
| JPS6466322A (en) * | 1987-09-04 | 1989-03-13 | Ishikawajima Harima Heavy Ind | Method and ship for dredging operation |
| US5001845A (en) * | 1989-08-17 | 1991-03-26 | W. R. Grace & Co.,-Conn. | Control system for an industrial dryer |
| US5247975A (en) * | 1989-12-25 | 1993-09-28 | Hisaka Works Limited | Wood treating method and apparatus |
| US5325604A (en) * | 1992-12-17 | 1994-07-05 | The University Of Tennessee Research Corporation | Automatic control system for wood drying kiln |
| JPH06213566A (ja) * | 1993-01-20 | 1994-08-02 | Yukio Ishii | 木材改質装置 |
| DK0622163T3 (da) * | 1993-04-21 | 1996-09-16 | Shell Int Research | Fremgangsmåde til opgradering af lavkvalitets-træ |
| JP3813690B2 (ja) * | 1996-07-22 | 2006-08-23 | 永大産業株式会社 | 木質材の寸法安定化処理方法 |
| JP2002086407A (ja) * | 2000-09-11 | 2002-03-26 | Shinshiba Setsubi:Kk | 木材の人工乾燥方法および木材乾燥装置 |
-
2002
- 2002-10-28 FR FR0213427A patent/FR2846269B1/fr not_active Expired - Fee Related
-
2003
- 2003-10-02 AU AU2003285393A patent/AU2003285393A1/en not_active Abandoned
- 2003-10-02 WO PCT/FR2003/002884 patent/WO2004042301A1/fr not_active Ceased
- 2003-10-02 EP EP03778383A patent/EP1558884A1/fr not_active Withdrawn
- 2003-10-02 CA CA002502370A patent/CA2502370A1/fr not_active Abandoned
- 2003-10-02 JP JP2004549250A patent/JP2006505423A/ja active Pending
- 2003-10-02 US US10/531,765 patent/US20050284945A1/en not_active Abandoned
- 2003-10-02 CN CN200380102172.XA patent/CN1708667A/zh active Pending
-
2009
- 2009-10-15 JP JP2009238261A patent/JP2010018032A/ja active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3744144A (en) * | 1971-04-23 | 1973-07-10 | H Weis | Automated controls for lumber drying kiln |
| US4356641A (en) * | 1980-12-15 | 1982-11-02 | Armstrong World Industries | Kiln control system |
| EP0142071A2 (fr) * | 1983-11-09 | 1985-05-22 | Lignomat GmbH | Procédé pour sécher le bois |
| FR2604245A1 (fr) * | 1986-09-19 | 1988-03-25 | Gautreau Jean Paul | Procede de sechage de produits hygroscopiques de fortes epaisseurs, notamment du bois. |
| US4862599A (en) * | 1987-05-26 | 1989-09-05 | Gesellschaft Fur Messtechnik Mbh | Process and apparatus for drying wood |
| US5678324A (en) * | 1993-05-12 | 1997-10-21 | Valtion Teknillinen Tutkimuskeskus | Method for improving biodegradation resistance and dimensional stability of cellulosic products |
| FR2720969A1 (fr) * | 1994-06-14 | 1995-12-15 | Herve Montornes | Procédé de traitement haute température d'un matériau ligno-cellulosique. |
| FR2757097A1 (fr) * | 1996-12-13 | 1998-06-19 | Bci | Dispositif et procede de traitement a haute temperature de materiau ligno-cellulosique |
| FR2790698A1 (fr) | 1999-03-09 | 2000-09-15 | Jean Laurencot | Dispositif pour le traitement thermique a haute temperature d'une matiere ligneuse |
| US20010015020A1 (en) * | 2000-02-04 | 2001-08-23 | Wood Drying Research | Method and apparatus for drying wood |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101514865B (zh) * | 2008-02-19 | 2012-05-30 | 刘鼎革 | 立体多层式单板烘干机 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2010018032A (ja) | 2010-01-28 |
| JP2006505423A (ja) | 2006-02-16 |
| EP1558884A1 (fr) | 2005-08-03 |
| AU2003285393A1 (en) | 2004-06-07 |
| CA2502370A1 (fr) | 2004-05-21 |
| US20050284945A1 (en) | 2005-12-29 |
| WO2004042301A8 (fr) | 2005-04-28 |
| FR2846269B1 (fr) | 2004-12-24 |
| AU2003285393A8 (en) | 2004-06-07 |
| FR2846269A1 (fr) | 2004-04-30 |
| CN1708667A (zh) | 2005-12-14 |
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Legal Events
| Date | Code | Title | Description |
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