EP1133666B1 - Device for high temperature heat treatment of ligneous material - Google Patents
Device for high temperature heat treatment of ligneous material Download PDFInfo
- Publication number
- EP1133666B1 EP1133666B1 EP00907740A EP00907740A EP1133666B1 EP 1133666 B1 EP1133666 B1 EP 1133666B1 EP 00907740 A EP00907740 A EP 00907740A EP 00907740 A EP00907740 A EP 00907740A EP 1133666 B1 EP1133666 B1 EP 1133666B1
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- Prior art keywords
- chamber
- treatment
- heat
- charge
- treated
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Classifications
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/02—Heating arrangements using combustion heating
Definitions
- Wood is a widely used material because it has multiple advantages both aesthetically and in terms of its mechanical properties, acoustic and insulating.
- This treatment can be done by impregnation with chemicals that are toxic products harmful to the environment, or thermally by the process of make a chemical bridging between the macromolecular chains of constituents of wood thermally in a controlled atmosphere and at a minimum temperature of 230 ° C.
- the second solution is clearly preferable because chemical treatments can have consequences harmful to the environment and health.
- the homogeneity and the reproducibility of treatment are of course essential.
- High temperature heat treatment of wood requires the use of devices that allow the wood to be heated at high temperatures without this one ignites. This can only be done by reducing the content of oxygen of the volume of air contained in the treatment chamber.
- Such devices are described in the French patents published under Nos. 2591 611 and 2,609,927 which provide ovens with one or more burners which, by heating the volume of air contained in the enclosure of heating, reduce the oxygen content of this volume of air.
- the present invention aims to remedy these disadvantages encountered in the operation of the devices currently proposed by offering a device using the combustion of at least one burner to heat the the air volume of the treatment chamber and reduce the oxygen content, and with improved means of packaging and management of the treatment chamber and the load of ligneous material to be treated.
- the device according to the invention as defined in the preamble and characterized in that it comprises means for regulating the temperature and humidity of the treatment chamber arranged for humidify said chamber during its rise in temperature, stabilize its temperature during treatment of the woody material load by continuous circulation of the coolant and cool it down in successive steps after the treatment.
- the device comprises means concentration of the coolant.
- it also comprises means for adjusting the pressure prevailing in the enclosure, said means being arranged to maintain an overpressure in said enclosure.
- the means for conditioning the material charge to be treated comprise, between the stacked elements, spacers whose dimensions are defined according to the dimensions of the ligneous material to be treated.
- the device processing chamber has in its upper part, an arranged heating chamber to heat the coolant after each pass through the load of ligneous material to be treated and communicating, through a closed opening in the bottom of said chamber, with the lower part of the enclosure forming a treatment area.
- the device advantageously comprises means for modifying the height of the treatment area according to the variation of the height of the load of ligneous material to be treated.
- the means for concentrating the heat transfer fluid are arranged to cooperate with the heating means of said fluid to obtain a better homogenization of the temperature and a neutral atmosphere by destruction of the oxygen in the enclosure, and are arranged in the chamber of heating the coolant.
- the means for heating the heat transfer fluid comprise at least one gas burner and the coolant defining an atmosphere neutral is formed by a mixture of air freed of its oxygen and gases burner combustion.
- the enclosure comprises means arranged to seal around the load of woody material to be treated.
- the device may comprise electronic means of programmable management of variations of temperature in the enclosure.
- the temperature regulation means comprise at least one ramp water spray arranged at the outlet of the heating chamber of the coolant.
- the means for concentrating the coolant can comprise at least minus a concentration cone associated with at least one deflector of distribution arranged to homogenize the concentrated flow of hot gas, the axis said cone coinciding with the axis of the flame generated by the burner.
- the means for adjusting an overpressure in the enclosure include preferably a calibrated valve arranged on a circuit of evacuation of the supplement of gas supplied by the combustion of the at least one burner.
- Means for changing the height of the treatment area according to the variation in the height of the load of capitaous material to be treated and a seal around said load may comprise a screen height variable arranged vertically between the load of the ligneous material to be treated and the bottom of the heating chamber.
- the sealing of said load is in further provided by longitudinal brackets provided on the support of the load, said angles being arranged to cooperate with the edge of bins recovery located at the bottom of the enclosure.
- the device also comprises means arranged to introduce gas neutral in the treatment enclosure during the cooling phase of said enclosure.
- the device 10 intended for heat treatment at high temperature of a load of wood material 11 such as wood by continuous circulation of a coolant heated to a temperature greater than 230 ° comprises a chamber 12 of treatment.
- This enclosure is present in the general form of a parallelepiped with a rectangular base and comprises four vertical walls 13, 14, 15 and 16 and a ceiling 17. These walls and ceiling are made of two metal plates between which is placed a thermally insulating material.
- the inner walls of the enclosure are preferably made of a stainless steel sheet.
- the front wall 16 of the enclosure 12 is provided a door 18 for loading the ligneous material to be treated 11.
- the enclosure 12 is provided in its upper part, at a distance between 0.20 and 1.50 meters from the ceiling 17, a partition 19 whose width is lower than that ceiling and which defines, between it and said ceiling, a chamber called heating chamber 20, opening into the enclosure by the opening 21 formed by the difference in width between the partition 19 and the ceiling 17, and a zone called treatment zone 22 in which the material ligneous to be treated is introduced.
- the heating chamber 20 is provided on its longitudinal wall 14 with heating means such as one or more burners 23 preferably with gas and adjustable power for heating the heat transfer fluid to its point concentration and reduce the oxygen content.
- the flame 24 of each burner 23 extends horizontally between the ceiling 17 and the partition 19 and is surrounded by a fluid concentration means under the form of plates 25 arranged to delimit a cone 26 whose axis is confused with that of the flame 24 generated by the burner 23.
- This cone 26 is associated with a distribution deflector 27 which makes it possible to homogenize the concentrated stream of gas emitted by the hot burner before entering the treatment zone 22 through the opening 21 of the chamber 20.
- Fluid circulation means in the form of fans 28 are also housed in the heating chamber 20 and are arranged vertically on each side of the burners 23 between the ceiling 17 and the partition 19 in which they debouch. These fans are cooperating with the opening 21 for circulating the heat transfer fluid between the upper volume of the heating chamber 20 and the lower volume defining the zone of treatment 22.
- the underside of the partition 19, which forms the top of the treatment zone 22, comprises means for regulating the temperature and humidity of the treatment enclosure 12.
- These means are in the form of a horizontal spray boom 30 high pressure water, attached to the outlet of the heating chamber 20 under the edge of the partition 19 defining the opening 21.
- This water spray boom 30 is provided with a sufficient number of nozzles to spray high volume fog and is supplied with cold water, or possibly refrigerated, by means known in themselves who are not represented. It is intended to moisten the treatment zone 22 during the temperature rise of the chamber 12, to stabilize its temperature during the treatment of the material load 11, and to allow its cooling in successive stages after the treatment.
- the load of ligneous material to be treated 11 which, in this case, consists of wooden boards stacked one on the other to form substantially a parallelepipedic structure placed on a movable support 31, is put in place in the enclosure 12 by the loading door 18.
- boards are placed so that their length lies in the direction of the enclosure, and they are separated from each other by spacers in the form of spacers 32 placed in their direction transverse.
- the thickness of these spacers is defined according to the thickness of the wood to be treated, the dimensions of the load and the parameters physical flow of fluid in the chamber and in said load.
- the support 31, on which the wood to be treated is stacked, is movable by the intermediate wheel 33 moving on two longitudinal rails 34 arranged at the bottom of the enclosure.
- This support is also provided with two longitudinal angles 35 in inverted L shape which cooperate each with the vertical edge of two trays 36 arranged at the bottom of the enclosure, from and other of the load to be treated. These bins are intended for the recovery of runoff and condensation runoff occurring during treatment.
- This connection between the mobile support 31 and the bins of recovery 36 makes it possible to close the existing passage under the support and seals between the bottom of the walls of the enclosure and the load of material to be treated.
- the load of ligneous material treat 11 delimits a first volume, said booster chamber 40, located between said load and the wall 13 of the enclosure defining the opening 21, and a second volume, said recovery chamber 41, located between the load and the wall opposite 14 of the enclosure 12.
- the means of concentration of the fluid and the arrangement of the opening 21 cause a circulation of said fluid in the transverse direction of the zone of treatment 22, that is to say from the booster chamber 40 to the chamber of recovery 41 passing through the load 11 of the woody material to be treated.
- the fans 28 then suck the heat transfer fluid at the level of the partition 19 in the recovery chamber 41 and pulsate in the chamber of heating 20 downstream of the burners 23.
- the seal around the load is also obtained by modifying the height of the treatment zone 22 according to the variation of the height the load of woody material to be treated.
- the treatment zone 22 is provided with a height-adjustable screen 42 arranged vertically between the top of the load 11 of ligneous material to be treated and the partition 19 forming the bottom of the heating chamber 20 and therefore the ceiling of this treatment area. This screen allows the removal of a traffic of the coolant and maintaining a constant pressure in the treatment zone 22.
- Orifices 44 formed in the lower part of the wall 14 of the recovery chamber 41 of the enclosure and regularly distributed on this wall, allow the evacuation of additional gas produced by the supply of combustion of burners and increase of volume of heat transfer fluid when raising the temperature.
- These orifices 44 open into a horizontal collector 45 located outside the enclosure 12, this collector being itself connected to a series of vertical tubes 46 forming a condenser and debouching in a chimney 47 via a circuit discharge 48 provided with a sealed valve 49.
- This valve which is tared, is the means for adjusting the pressure in the treatment chamber 12.
- the treatment zone 22 is furthermore provided with several ramps 50 horizontal sprinklers fixed on each longitudinal wall 13, 14 of the enclosure. These ramps are designed to be put into operation in case of accidental ignition of the charge 11 and are connected to appropriate flows 51.
- outlets 52 arranged at the bottom of the enclosure 12 allow the flow of liquids recovered in recovery bins 36.
- the chamber 12 is sealed by the establishment of joints sealing at the door 18 and siphons at the openings evacuation 52.
- the control of the temperature and the humidity rate prevailing in the enclosure course of treatment is obtained by probes of temperature and rate hygrometry (not shown) known per se and arranged on each longitudinal inner walls 13, 14 of the enclosure. Another probe also housed in the enclosure allows a permanent control of the content in oxygen of the coolant.
- a supply of neutral gas is made by an arrival (not shown) formed in one of the walls of the treatment chamber 12.
- Programmable electronic means not shown allow the management of temperature changes and humidity levels in the treatment chamber.
- the operating principle of the device of the invention is based on a continuous circulation of the coolant gas formed by the air removed from its oxygen and mixed with the flue gases to provide an atmosphere neutral. After being heated in successive stages to a temperature minimum of 230 °, these levels being defined from the parameters of the capitaous material to be treated, the heat-transfer gas circulates continuously during the whole of treatment cycle, from the point where it is warmed by the burners to the load of ligneous material to be treated that it crosses at a balanced rate and speed in any point of his circuit by bringing him homogeneous calories necessary for heat treatment.
- This pulsed circulation by fans is conditioned by the cones that concentrate the volume into a reheating point and by deflectors that homogenize the fluid before its introduction at low speed into the booster chamber, while that a pressure of order 4 mmCE in the enclosure is regulated by the flap tare placed in the chimney.
- the fluid After passing through the load to be treated, passage during which there is a heat exchange between the fluid and the charge, the fluid arrives in the recovery chamber at a pressure and a different from those of your booster chamber. So he is picked up by the fans and warmed up and reconditioned in the room's heating before a new passage through the load.
- the treatment cycle requires several passages of the fluid through the load.
- the enclosure may be equipped with a second door for unloading the woody material after processing and moving the load support can be automated. It is also possible to modify the positioning of the burners and fans.
- the device may also be provided with an element intended to treat the air to lower the oxygen content.
- the device means for modifying the height of the treatment area according to the variation of the height of the load of ligneous material to be treated composed of a pressure plate of a surface at least equal to the horizontal surface of said load.
- Said pressure plate is placed on the ceiling of the treatment area and remains attached to it by means of suspension and operating means such as at least one jack, not shown, making it possible to raise said pressure plate, to lower it on the load of woody material to be treated after introduction of the latter into the treatment chamber and to apply on said load a constant pressure throughout the duration of the treatment to avoid deformations.
Abstract
Description
La présente invention concerne un dispositif pour le traitement thermique à haute température d'une charge de matière ligneuse composée d'éléments empilés, et notamment d'une charge de bois, ledit dispositif étant pourvu d'une enceinte de traitement comportant :
- des moyens de conditionnement d'une charge de matière ligneuse à traiter,
- des moyens de chauffage d'un fluide caloporteur circulant dans ladite enceinte,
- des moyens de circulation en continu dudit fluide caloporteur, et
- des moyens de contrôle de la température et de l'hygrométrie de l'enceinte.
- means for conditioning a load of ligneous material to be treated,
- means for heating a heat transfer fluid circulating in said enclosure,
- means for continuously circulating said coolant, and
- means for controlling the temperature and hygrometry of the enclosure.
Le bois est un matériau très utilisé car il présente de multiples avantages aussi bien sur le plan esthétique qu'au niveau de ses propriétés mécaniques, acoustiques et isolantes. Cependant pour qu'il conserve toutes ses caractéristiques et sa stabilité dimensionnelle en présence d'humidité ou immergé dans l'eau, le bois doit être traité afin d'éliminer tous les supports qui génèrent les germes et les moisissures. Ce traitement peut se faire par imprégnation à l'aide de produits chimiques qui sont des produits toxiques nuisant à l'environnement, ou thermiquement par le procédé qui consiste à réaliser un pontage chimique entre les chaínes macromoléculaires des constituants du bois par voie thermique en atmosphère contrôlée et à une température minimum de 230°C. La deuxième solution est nettement préférable car les traitements chimiques peuvent avoir des conséquences néfastes sur l'environnement et la santé. Cependant, pour assurer la fiabilité des résultats obtenus par le traitement thermique, l'homogénéité et la reproductibilité du traitement sont bien entendu indispensables.Wood is a widely used material because it has multiple advantages both aesthetically and in terms of its mechanical properties, acoustic and insulating. However, to keep all his characteristics and its dimensional stability in the presence of moisture or immersed in water, the wood must be treated in order to eliminate all generate germs and molds. This treatment can be done by impregnation with chemicals that are toxic products harmful to the environment, or thermally by the process of make a chemical bridging between the macromolecular chains of constituents of wood thermally in a controlled atmosphere and at a minimum temperature of 230 ° C. The second solution is clearly preferable because chemical treatments can have consequences harmful to the environment and health. However, to ensure reliability results obtained by the heat treatment, the homogeneity and the reproducibility of treatment are of course essential.
Pour obtenir ces résultats en application industrielle, principalement au niveau de l'homogénéité du traitement des produits, il est important et indispensable de disposer de moyens appropriés permettant d'obtenir cette homogénéité dans l'ensemble du volume d'un produit et dans l'ensemble du volume de produits d'une charge soumise au traitement.To obtain these results in industrial application, mainly at of the homogeneity of the treatment of the products, it is important and indispensable to have appropriate means to obtain this homogeneity throughout the volume of a product and in the entire volume of products of a load subjected to treatment.
Il existe des procédés et des équipements agencés pour ce type de traitement à haute température du bois. L'un de ces procédés décrit par le brevet français publié sous le No 2 604 942 est un procédé qui nécessite un équipement coûteux en raison de la création de l'ambiance neutre indispensable, c'est-à-dire le remplissage du volume de l'enceinte de traitement à l'aide d'un gaz neutre tel que l'azote, et un équipement de chauffage utilisant un échangeur extérieur.There are methods and equipment arranged for this type of high temperature treatment of wood. One of these methods described by French patent published under No. 2,604,942 is a process which requires a expensive equipment due to the creation of the neutral atmosphere indispensable, that is to say the filling of the volume of the enclosure of treatment with a neutral gas such as nitrogen, and equipment for heating using an outdoor heat exchanger.
Le traitement thermique à haute température du bois requiert l'utilisation de dispositifs qui permettent de porter le bois à haute température sans que celui-ci s'enflamme. Ceci ne peut se faire qu'en réduisant la teneur en oxygène du volume d'air contenu dans l'enceinte de traitement. De tels dispositifs sont décrits dans les brevets français publiés sous les Nos 2591 611 et 2 609 927 qui proposent des fours pourvus d'un ou de plusieurs brûleurs qui, en chauffant le volume d'air contenu dans l'enceinte de chauffage, réduisent la teneur en oxygène de ce volume d'air.High temperature heat treatment of wood requires the use of devices that allow the wood to be heated at high temperatures without this one ignites. This can only be done by reducing the content of oxygen of the volume of air contained in the treatment chamber. Such devices are described in the French patents published under Nos. 2591 611 and 2,609,927 which provide ovens with one or more burners which, by heating the volume of air contained in the enclosure of heating, reduce the oxygen content of this volume of air.
Ces dispositifs connus ont permis d'obtenir avec succès en laboratoire les résultats attendus quant à l'homogénéité et la qualité du traitement dans des pièces de bois de petites dimensions conditionnées en charges de très faible volume. Cependant, lors du passage à la phase de traitement industriel, ils ne permettent pas d'obtenir une reproductibilité acceptable et de bons résultats quant à la qualité du traitement, principalement au niveau de l'homogénéité dudit traitement, non seulement à l'intérieur d'une charge de pièces de bois soumise à ce traitement, mais également dans une seule et même pièce de bois. On a constaté des différences de qualité entre les mêmes produits constituant une même charge, mais également sur la longueur ou le volume total d'un seul et même produit inclus dans une charge. These known devices have made it possible to obtain successfully in the laboratory the expected results in terms of homogeneity and quality of treatment in small wooden pieces packaged in very low loads volume. However, during the transition to the industrial processing phase, they do not not achieve acceptable reproducibility and good results as to the quality of the treatment, mainly in terms of homogeneity said treatment, not only inside a load of pieces of wood subjected to this treatment, but also in one and the same room of wood. There were differences in quality between the same products constituting the same load, but also on the length or volume total of one and the same product included in a load.
La présente invention a pour but de remédier à ces inconvénients rencontrés dans le fonctionnement des dispositifs actuellement proposés en offrant un dispositif utilisant la combustion d'au moins un brûleur pour chauffer le volume d'air de l'enceinte de traitement et en réduire la teneur en oxygène, et comportant des moyens améliorés de conditionnement et de gestion de l'enceinte de traitement et de la charge de matière ligneuse à traiter.The present invention aims to remedy these disadvantages encountered in the operation of the devices currently proposed by offering a device using the combustion of at least one burner to heat the the air volume of the treatment chamber and reduce the oxygen content, and with improved means of packaging and management of the treatment chamber and the load of ligneous material to be treated.
Ce but est atteint par le dispositif selon l'invention tel que défini en préambule et caractérisé en ce qu'il comporte des moyens de régulation de la température et de l'humidité de l'enceinte de traitement agencés pour humidifier ladite enceinte pendant sa montée en température, stabiliser sa température pendant le traitement de la charge de matière ligneuse par circulation continue du fluide caloporteur et la refroidir par paliers successifs après le traitement.This object is achieved by the device according to the invention as defined in the preamble and characterized in that it comprises means for regulating the temperature and humidity of the treatment chamber arranged for humidify said chamber during its rise in temperature, stabilize its temperature during treatment of the woody material load by continuous circulation of the coolant and cool it down in successive steps after the treatment.
Selon une forme de réalisation préférée, le dispositif comporte des moyens de concentration du fluide caloporteur.According to a preferred embodiment, the device comprises means concentration of the coolant.
De façon avantageuse, il comporte également des moyens de réglage de la pression régnant dans l'enceinte, lesdits moyens étant agencés pour maintenir une surpression dans ladite enceinte.Advantageously, it also comprises means for adjusting the pressure prevailing in the enclosure, said means being arranged to maintain an overpressure in said enclosure.
De préférence, les moyens de conditionnement de la charge de matière ligneuse à traiter comportent, entre les éléments empilés, des organes d'écartement dont les dimensions sont définies en fonction des dimensions de la matière ligneuse à traiter.Preferably, the means for conditioning the material charge to be treated comprise, between the stacked elements, spacers whose dimensions are defined according to the dimensions of the ligneous material to be treated.
Dans la forme de réalisation préférée, l'enceinte de traitement du dispositif comporte dans sa partie supérieure, une chambre de chauffage agencée pour chauffer le fluide caloporteur après chaque passage à travers la charge de matière ligneuse à traiter et communiquant, par une ouverture ménagée dans le fond de ladite chambre, avec la partie inférieure de l'enceinte formant une zone de traitement. In the preferred embodiment, the device processing chamber has in its upper part, an arranged heating chamber to heat the coolant after each pass through the load of ligneous material to be treated and communicating, through a closed opening in the bottom of said chamber, with the lower part of the enclosure forming a treatment area.
Le dispositif comporte avantageusement des moyens pour modifier la hauteur de la zone de traitement en fonction de la variation de la hauteur de la charge de matière ligneuse à traiter.The device advantageously comprises means for modifying the height of the treatment area according to the variation of the height of the load of ligneous material to be treated.
Les moyens de concentration du fluide caloporteur sont agencés pour coopérer avec les moyens de chauffage dudit fluide pour obtenir une meilleure homogénéisation de la température et une ambiance neutre par destruction de l'oxygène dans l'enceinte, et sont disposés dans la chambre de chauffage du fluide caloporteur.The means for concentrating the heat transfer fluid are arranged to cooperate with the heating means of said fluid to obtain a better homogenization of the temperature and a neutral atmosphere by destruction of the oxygen in the enclosure, and are arranged in the chamber of heating the coolant.
De préférence, les moyens de chauffage du fluide caloporteur comprennent au moins un brûleur à gaz et le fluide caloporteur définissant une atmosphère neutre est formé par un mélange d'air débarrassé de son oxygène et des gaz de combustion du brûleur.Preferably, the means for heating the heat transfer fluid comprise at least one gas burner and the coolant defining an atmosphere neutral is formed by a mixture of air freed of its oxygen and gases burner combustion.
De façon avantageuse, l'enceinte comporte des moyens agencés pour assurer une étanchéité autour de la charge de matière ligneuse à traiter.Advantageously, the enclosure comprises means arranged to seal around the load of woody material to be treated.
Dans la forme de réalisation préférée, le dispositif peut comporter des moyens électroniques de gestion programmables des variations de température dans l'enceinte.In the preferred embodiment, the device may comprise electronic means of programmable management of variations of temperature in the enclosure.
Les moyens de régulation de température comprennent au moins une rampe de pulvérisation d'eau disposée à la sortie de la chambre de chauffage du fluide caloporteur.The temperature regulation means comprise at least one ramp water spray arranged at the outlet of the heating chamber of the coolant.
Les moyens de concentration du fluide caloporteur peuvent comporter au moins un cône de concentration associé à au moins un déflecteur de répartition agencé pour homogénéiser le flux concentré de gaz chaud, l'axe dudit cône étant confondu avec l'axe de la flamme générée par le brûleur. The means for concentrating the coolant can comprise at least minus a concentration cone associated with at least one deflector of distribution arranged to homogenize the concentrated flow of hot gas, the axis said cone coinciding with the axis of the flame generated by the burner.
Les moyens de réglage d'une surpression dans l'enceinte comportent de préférence un clapet taré disposé sur un circuit d'évacuation du supplément de gaz apporté par la combustion du au moins un brûleur.The means for adjusting an overpressure in the enclosure include preferably a calibrated valve arranged on a circuit of evacuation of the supplement of gas supplied by the combustion of the at least one burner.
Les moyens pour modifier la hauteur de la zone de traitement en fonction de la variation de la hauteur de la charge de matière ligneuse à traiter et assurer une étanchéité autour de ladite charge peuvent comporter un écran à hauteur variable disposé verticalement entre la charge de la matière ligneuse à traiter et le fond de la chambre de chauffage. L'étanchéité de ladite charge est en outre assurée par des cornières longitudinales ménagées sur le support de la charge, lesdites cornières étant agencées pour coopérer avec le bord de bacs de récupération disposés au fond de l'enceinte.Means for changing the height of the treatment area according to the variation in the height of the load of ligneous material to be treated and a seal around said load may comprise a screen height variable arranged vertically between the load of the ligneous material to be treated and the bottom of the heating chamber. The sealing of said load is in further provided by longitudinal brackets provided on the support of the load, said angles being arranged to cooperate with the edge of bins recovery located at the bottom of the enclosure.
Le dispositif comporte également des moyens agencés pour introduire du gaz neutre dans l'enceinte de traitement pendant la phase de refroidissement de ladite enceinte.The device also comprises means arranged to introduce gas neutral in the treatment enclosure during the cooling phase of said enclosure.
La présente invention sera mieux comprise en référence à la description
d'une forme de réalisation préférée donnée à titre d'exemple, et des dessins
annexés dans lesquels :
En référence aux figures, le dispositif 10 destiné au traitement thermique à
haute température d'une charge de matière ligneuse 11 telle que du bois par
circulation en continu d'un fluide caloporteur porté à une température
supérieure à 230°, comporte une enceinte 12 de traitement. Cette enceinte se
présente sous la forme générale d'un parallélépipède à base rectangulaire et
comporte quatre parois verticales 13, 14, 15 et 16 et un plafond 17. Ces
parois et le plafond sont constitués de deux plaques métalliques entre
lesquelles est placé un matériau thermiquement isolant. Afin d'éviter la
corrosion, les parois intérieures de l'enceinte sont de préférence réalisées en
une tôle d'acier inoxydable. La paroi frontale 16 de l'enceinte 12 est pourvue
d'une porte 18 permettant le chargement de la matière ligneuse à traiter 11.With reference to the figures, the
L'enceinte 12 est pourvue dans sa partie supérieure, à une distance comprise
entre 0,20 et 1,50 mètres du plafond 17, d'une cloison 19 dont la largeur est
inférieure à celle dudit plafond et qui définit, entre elle et ledit plafond, une
chambre dite chambre de chauffage 20, débouchant dans l'enceinte par
l'ouverture 21 formée par la différence de largeur entre la cloison 19 et le
plafond 17, et une zone dite zone de traitement 22 dans laquelle la matière
ligneuse à traiter est introduite.The
La chambre de chauffage 20 est pourvue sur sa paroi longitudinale 14 de
moyens de chauffage tels que un ou des brûleurs 23 de préférence à gaz et à
puissance modulable permettant de chauffer le fluide caloporteur en son point
de concentration et d'en réduire la teneur en oxygène. La flamme 24 de
chaque brûleur 23 s'étend horizontalement entre le plafond 17 et la cloison 19
et est entourée d'un moyen de concentration du fluide se présentant sous la
forme de plaques 25 disposées pour délimiter un cône 26 dont l'axe est
confondu avec celui de la flamme 24 générée par le brûleur 23. Ce cône 26
est associé à un déflecteur de répartition 27 qui permet d'homogénéiser le
flux concentré de gaz émis par le brûleur chaud avant son entrée dans la
zone de traitement 22 par l'ouverture 21 de la chambre 20. The
Des moyens de circulation du fluide sous la forme de ventilateurs 28 sont
également logés dans la chambre de chauffage 20 et sont disposés
verticalement de chaque côté des brûleurs 23 entre le plafond 17 et la cloison
19 dans laquelle ils débouchent. Ces ventilateurs 28 coopèrent avec
l'ouverture 21 pour faire circuler le fluide caloporteur entre le volume supérieur
de la chambre de chauffage 20 et le volume inférieur délimitant la zone de
traitement 22.Fluid circulation means in the form of
La face inférieure de la cloison 19, qui forme le haut de la zone de traitement
22, comporte des moyens de régulation de la température et de l'humidité de
l'enceinte de traitement 12. Ces moyens se présentent sous la forme d'une
rampe horizontale de pulvérisation 30 à haute pression d'eau, fixée à la sortie
de la chambre de chauffage 20 sous le bord de la cloison 19 définissant
l'ouverture 21. Cette rampe de pulvérisation d'eau 30 est pourvue d'un
nombre suffisant de buses permettant de pulvériser un brouillard à fort débit
et est alimentée en eau froide, ou éventuellement réfrigérée, par des moyens
connus en soi qui ne sont pas représentés. Elle est destinée à humidifier la
zone de traitement 22 pendant la montée en température de l'enceinte 12, à
stabiliser sa température pendant le traitement de la charge de matière
ligneuse 11, et à permettre son refroidissement par paliers successifs après le
traitement.The underside of the
La charge de matière ligneuse à traiter 11 qui, dans le présent cas, se
compose de planches de bois empilées les une sur les autres pour former
sensiblement une structure parallélépipédique placée sur un support mobile
31, est mise en place dans l'enceinte 12 par la porte de chargement 18. Les
planches sont placées de façon que leur longueur se trouve dans le sens
longitudinal de l'enceinte, et elles sont écartées les unes des autres par des
organes d'écartement sous la forme d'entretoises 32 placées dans leur sens
transversal. L'épaisseur de ces entretoises est définie en fonction de
l'épaisseur des bois à traiter, des dimensions de la charge et des paramètres
physiques de circulation du fluide dans l'enceinte et dans ladite charge. The load of ligneous material to be treated 11 which, in this case,
consists of wooden boards stacked one on the other to form
substantially a parallelepipedic structure placed on a
Le support 31, sur lequel le bois à traiter est empilé, est mobile par
l'intermédiaire de roues 33 se déplaçant sur deux rails longitudinaux 34
disposés au fond de l'enceinte. Ce support est en outre pourvu de deux
cornières longitudinales 35 en forme de L inversé qui coopèrent chacune
avec le bord vertical de deux bacs 36 disposés au fond de l'enceinte, de part
et d'autre de la charge à traiter. Ces bacs sont destinés à la récupération des
écoulements et des ruissellements de condensation se produisant au cours
du traitement. Cette liaison entre le support mobile 31 et les bacs de
récupération 36 permet de fermer le passage existant sous le support et
assure l'étanchéité entre le bas des parois de l'enceinte et la charge de
matière à traiter.The
Lorsqu'elle a été introduite dans l'enceinte, la charge de matière ligneuse à
traiter 11 délimite un premier volume, dit chambre de surpression 40, situé
entre ladite charge et la paroi 13 de l'enceinte définissant l'ouverture 21, et un
second volume, dit chambre de reprise 41, situé entre la charge et la paroi
opposée 14 de l'enceinte 12.When introduced into the enclosure, the load of ligneous material
treat 11 delimits a first volume, said
Les moyens de concentration du fluide et la disposition de l'ouverture 21
entraínent une circulation dudit fluide dans le sens transversal de la zone de
traitement 22, c'est-à-dire de la chambre de surpression 40 à la chambre de
reprise 41 en passant à travers la charge 11 de la matière ligneuse à traiter.
Les ventilateurs 28 aspirent ensuite le fluide caloporteur au niveau de la
cloison 19 dans la chambre de reprise 41 et le pulsent dans la chambre de
chauffage 20 en aval des brûleurs 23.The means of concentration of the fluid and the arrangement of the
L'étanchéité autour de la charge est également obtenue en modifiant la
hauteur de la zone de traitement 22 en fonction de la variation de la hauteur
de la charge de matière ligneuse à traiter. A cet effet, la zone de traitement 22
est pourvue d'un écran 42 à hauteur variable disposé verticalement entre le
haut de la charge 11 de matière ligneuse à traiter et la cloison 19 formant le
fond de la chambre de chauffage 20 et, par conséquent, le plafond de cette
zone de traitement. Cet écran permet la suppression d'une circulation
préférentielle du fluide caloporteur et le maintien d'une pression constante
dans la zone de traitement 22.The seal around the load is also obtained by modifying the
height of the
Des orifices 44, ménagés dans la partie inférieure de la paroi 14 de la
chambre de reprise 41 de l'enceinte et régulièrement repartis sur cette paroi,
permettent l'évacuation du surcroít de gaz produit par l'apport des gaz de
combustion des brûleurs et l'augmentation de volume du fluide caloporteur
lors de l'élévation de la température. Ces orifices 44 débouchent dans un
collecteur horizontal 45 situé à l'extérieur de l'enceinte 12, ce collecteur étant
lui-même relié à une série de tubes verticaux 46 formant un condenseur et
débouchant dans une cheminée 47 par l'intermédiaire d'un circuit
d'évacuation 48 muni d'un clapet étanche 49. Ce clapet, qui est taré, constitue
les moyens de réglage de la pression régnant dans l'enceinte de traitement
12.
La zone de traitement 22 est en outre pourvue de plusieurs rampes
d'arrosage 50 horizontales fixées sur chaque paroi longitudinale 13, 14 de
l'enceinte. Ces rampes à gros débit sont destinées à être mises en fonction
en cas d'inflammation accidentelle de la charge 11 et sont reliées à des
écoulements appropriés 51. Par ailleurs des orifices d'évacuation 52
ménagés au bas de l'enceinte 12 permettent l'écoulement des liquides
récupérés dans les bacs de récupération 36.The
Afin d'éviter toute pénétration d'oxygène à l'intérieur de l'enceinte pendant le
traitement, l'enceinte 12 est rendue étanche par la mise en place de joints
d'étanchéité au niveau de la porte 18 et de siphons au niveau des orifices
d'évacuation 52.In order to prevent oxygen penetration into the enclosure during
treatment, the
Le contrôle de la température et du taux d'humidité régnant dans l'enceinte au
cours du traitement est obtenu par des sondes de température et du taux
d'hygrométrie (non représentées) connues en soi et disposées sur chacune
des parois intérieures longitudinales 13, 14 de l'enceinte. Une autre sonde
également logée dans l'enceinte permet un contrôle permanent de la teneur
en oxygène du fluide caloporteur.The control of the temperature and the humidity rate prevailing in the enclosure
course of treatment is obtained by probes of temperature and rate
hygrometry (not shown) known per se and arranged on each
longitudinal
Pour compenser la réduction de volume du fluide caloporteur pendant la
phase de refroidissement, un apport de gaz neutre se fait par une arrivée
(non représentée) ménagée dans une des parois de l'enceinte de traitement
12.To compensate for the reduction in the volume of the coolant during
cooling phase, a supply of neutral gas is made by an arrival
(not shown) formed in one of the walls of the
Des moyens électroniques programmables non représentés permettent la gestion des paliers de variations de température et du taux d'hygrométrie dans l'enceinte de traitement.Programmable electronic means not shown allow the management of temperature changes and humidity levels in the treatment chamber.
Le principe de fonctionnement du dispositif de l'invention est basé sur une circulation en continu du gaz caloporteur formé par l'air débarrassé de son oxygène et mélangé aux gaz de combustion pour fournir une atmosphère neutre. Après avoir été chauffé par paliers successifs jusqu'à une température minimum de 230°, ces paliers étant définis à partir des paramètres de la matière ligneuse à traiter, le gaz caloporteur circule en continu, durant tout le cycle de traitement, du point où il est réchauffé par les brûleurs vers la charge de matière ligneuse à traiter qu'il traverse à des débit et vitesse équilibrés en tout point de son circuit en lui apportant de façon homogène les calories nécessaires au traitement thermique. Cette circulation pulsée par les ventilateurs est conditionnée par les cônes qui concentrent le volume en un point de réchauffage et par les déflecteurs qui homogénéisent le fluide avant son introduction à faible vitesse dans la chambre de surpression, tandis qu'une pression de l'ordre 4 mmCE dans l'enceinte est réglée par le clapet taré placé dans la cheminée. Après son passage dans la charge à traiter, passage pendant lequel il y a échange calorifique entre le fluide et ladite charge, le fluide arrive dans la chambre de reprise à une pression et une température différentes de celles de ta chambre de surpression. Il est alors repris par les ventilateurs et réchauffé et reconditionné dans la chambre de chauffage avant un nouveau passage à travers la charge. Le cycle de traitement nécessite plusieurs passages du fluide à travers la charge. Lorsque ce cycle est terminé, la descente de la température se fait par paliers successifs à l'aide d'une pulvérisation d'eau froide à haute pression dans le circuit du gaz caloporteur dans la chambre de surpression au moyen de la rampe de pulvérisation. La pression de l'ordre de 4mmCE est maintenue dans la zone de traitement par l'arrivée du gaz neutre qui compense la réduction du volume de fluide caloporteur pendant cette phase de refroidissement. Cette pulvérisation est également sollicitée afin d'éviter les chocs thermiques sur la charge de matière ligneuse à traiter lors d'une montée anormale de la température dans l'enceinte.The operating principle of the device of the invention is based on a continuous circulation of the coolant gas formed by the air removed from its oxygen and mixed with the flue gases to provide an atmosphere neutral. After being heated in successive stages to a temperature minimum of 230 °, these levels being defined from the parameters of the ligneous material to be treated, the heat-transfer gas circulates continuously during the whole of treatment cycle, from the point where it is warmed by the burners to the load of ligneous material to be treated that it crosses at a balanced rate and speed in any point of his circuit by bringing him homogeneous calories necessary for heat treatment. This pulsed circulation by fans is conditioned by the cones that concentrate the volume into a reheating point and by deflectors that homogenize the fluid before its introduction at low speed into the booster chamber, while that a pressure of order 4 mmCE in the enclosure is regulated by the flap tare placed in the chimney. After passing through the load to be treated, passage during which there is a heat exchange between the fluid and the charge, the fluid arrives in the recovery chamber at a pressure and a different from those of your booster chamber. So he is picked up by the fans and warmed up and reconditioned in the room's heating before a new passage through the load. The treatment cycle requires several passages of the fluid through the load. When this cycle is completed, the descent of the temperature is done in successive stages with the help of a high-pressure cold water spray in the heat-transfer circuit in the booster chamber by means of the spray boom. The pressure of the order of 4mmCE is maintained in the treatment area by the arrival of the gas which compensates for the reduction in the volume of coolant during this cooling phase. This spraying is also requested in order to avoid thermal shocks on the load of ligneous material to be treated during a climb abnormal temperature in the enclosure.
La présente invention n'est pas limitée à la forme de réalisation décrite mais peut subir différentes modifications évidentes pour l'homme du métier. En particulier, l'enceinte peut être équipée d'une deuxième porte destinée au déchargement de la matière ligneuse après son traitement et le déplacement du support de la charge peut être automatisé. Il est aussi possible de modifier le positionnement des brûleurs et des ventilateurs. Le dispositif peut également être pourvu d'un élément destiné à traiter l'air pour en abaisser la teneur en oxygène.The present invention is not limited to the described embodiment but may undergo various modifications obvious to the skilled person. In particular, the enclosure may be equipped with a second door for unloading the woody material after processing and moving the load support can be automated. It is also possible to modify the positioning of the burners and fans. The device may also be provided with an element intended to treat the air to lower the oxygen content.
De la même manière, on pourra prévoir dans le dispositif des moyens pour modifier la hauteur de la zone de traitement en fonction de la variation de la hauteur de la charge de matière ligneuse à traiter, composés d'un plateau presseur d'une surface au moins égale à la surface horizontale de ladite charge. Ledit plateau presseur est placé au plafond de la zone de traitement et reste solidaire de cette dernière par des moyens de suspension et de manoeuvre tel que au moins un vérin, non représenté, permettant de remonter ledit plateau presseur, de la descendre sur la charge de matière ligneuse à traiter après introduction de celle-ci dans l'enceinte du traitement et d'appliquer sur ladite charge une pression constante pendant toute la durée du traitement afin d'éviter les déformations.In the same way, it will be possible to provide in the device means for modifying the height of the treatment area according to the variation of the height of the load of ligneous material to be treated, composed of a pressure plate of a surface at least equal to the horizontal surface of said load. Said pressure plate is placed on the ceiling of the treatment area and remains attached to it by means of suspension and operating means such as at least one jack, not shown, making it possible to raise said pressure plate, to lower it on the load of woody material to be treated after introduction of the latter into the treatment chamber and to apply on said load a constant pressure throughout the duration of the treatment to avoid deformations.
Claims (17)
- Device for the high-temperature heat treatment of a charge of ligneous material composed of stacked elements, and more especially of a charge of wood, said device being provided with a treatment chamber (12) comprising:characterised in that it comprises means for regulating the temperature and the humidity of the treatment chamber, said means being designed to humidify said chamber during its rise in temperature, to stabilise its temperature during the treatment of the charge of ligneous material by the continuous circulation of the heat-carrying fluid, and to cool it down again in successive stages after the treatment.means for conditioning a charge (11) of ligneous material to be treated,means (23) for heating a heat-carrying fluid circulating in said chamber (12),means for continuously circulating said heat-carrying fluid, andmeans for monitoring the temperature and the hygrometry of the chamber,
- Device according to claim 1, characterised in that it comprises means for concentrating the heat-carrying fluid.
- Device according to claim 1, characterised in that it comprises means for regulating the pressure prevailing in the treatment chamber (12), said means being designed to maintain an excess pressure in said chamber.
- Device according to claim 1, characterised in that the means for conditioning the charge of ligneous material to be treated comprise, between the stacked elements, spacers (32), the dimensions of which are defined in dependence on the dimensions of the charge (11) of the ligneous material to be treated.
- Device according to claim 1, characterised in that the chamber (12) comprises, in its upper portion, a heating chamber (20), designed to heat the heat-carrying fluid after each passage through the charge (11) of ligneous material to be treated and communicating, through an opening (21) provided in the base (19) of said chamber, with the lower portion of the chamber forming a treatment zone (22).
- Device according to claim 5, characterised in that it comprises means for modifying the height of the treatment zone (22) in dependence on the variation in the height of the charge (11) of ligneous material to be treated.
- Device according to claims 1, 2 and 5, characterised in that the means for concentrating the heat-carrying fluid are designed to co-operate with the means for heating said fluid, in order to obtain a better homogenisation of the temperature and a neutral ambiance by destruction of the oxygen in the chamber, and said means are disposed in the heating chamber (20) of the heat-carrying fluid.
- Device according to claim 1, characterised in that the means for heating the heat-carrying fluid comprise at least one gas burner (23).
- Device according to claims 7 and 8, characterised in that the heat-carrying fluid, which determines a neutral atmosphere in the chamber (12), is formed by a mixture of air freed from its oxygen and combustion gases from the burner (23).
- Device according to claim 1, characterised in that the chamber (12) comprises means designed to ensure an insulation around the charge (11) of ligneous material to be treated.
- Device according to claim 1, characterised in that it comprises programmable electronic means for managing the variations in temperature in the treatment chamber (12).
- Device according to claims 1 and 5, characterised in that the temperature regulating means comprise at least one water pulverising ramp (30), disposed at the outlet of the chamber (20) for heating the heat-carrying fluid.
- Device according to claims 2 and 8, characterised in that the means for concentrating the heat-carrying fluid comprise at least one concentration cone (26), associated with at least one distribution deflector (27) designed to homogenise the concentrated flow of hot gas, the axis of said cone merging with the axis of the flame (24) generated by the burner.
- Device according to claim 3, characterised in that the means for regulating excess pressure in the chamber comprise an adjusted valve (49), disposed on a circuit (48) for removing the supplement of gas caused by the combustion of the at least one burner (23).
- Device according to claims 6 and 10, characterised in that the means for modifying the height of the treatment zone in dependence on the variation in the height of the charge (11) of ligneous material to be treated and for ensuring an insulation around said charge comprise a screen (42) of variable height, disposed vertically between the charge (11) of ligneous material to be treated and the base (19) of the heating chamber (20).
- Device according to claims 10 and 15, characterised in that the means for ensuring an insulation around the charge (11) of ligneous material to be treated comprise, in addition, longitudinal cornerpieces (35), provided on the support (31) of said charge, said cornerpieces being designed to co-operate with the edge of collecting tanks (36), disposed at the base of the treatment chamber (12).
- Device according to claim 1, characterised in that it comprises means designed to introduce neutral gas into the treatment chamber (12) during the phase of cooling said chamber.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9903179 | 1999-03-09 | ||
| FR9903179A FR2790698B1 (en) | 1999-03-09 | 1999-03-09 | DEVICE FOR THE HIGH TEMPERATURE HEAT TREATMENT OF A WOODY MATERIAL |
| PCT/FR2000/000492 WO2000053985A1 (en) | 1999-03-09 | 2000-02-29 | Device for high temperature heat treatment of ligneous material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1133666A1 EP1133666A1 (en) | 2001-09-19 |
| EP1133666B1 true EP1133666B1 (en) | 2005-10-26 |
Family
ID=9543208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00907740A Expired - Lifetime EP1133666B1 (en) | 1999-03-09 | 2000-02-29 | Device for high temperature heat treatment of ligneous material |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1133666B1 (en) |
| AT (1) | ATE308025T1 (en) |
| AU (1) | AU2922100A (en) |
| DE (1) | DE60023444T2 (en) |
| ES (1) | ES2250106T3 (en) |
| FR (1) | FR2790698B1 (en) |
| WO (1) | WO2000053985A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2846269B1 (en) | 2002-10-28 | 2004-12-24 | Jean Laurencot | PROCESS FOR TREATING A LOAD OF WOODY MATERIAL COMPOSED OF STACKED ELEMENTS, ESPECIALLY A LOAD OF WOOD, BY HEAT TREATMENT AT HIGH TEMPERATURE |
| FR2857291B1 (en) * | 2003-07-07 | 2006-09-08 | Daniel Besson | METHOD AND DEVICE FOR HIGH TEMPERATURE THERMAL TREATMENT OF WOODY MATERIAL |
| FR2861009A1 (en) * | 2003-10-15 | 2005-04-22 | Alain Dulac | Lingo-cellulosic material e.g. wood, drying and treating method, involves drying material at vaporization temperature of water, and gradually heating material to stabilized temperature by controlling pressure inside enclosure |
| US9726429B1 (en) * | 2016-01-31 | 2017-08-08 | EPCON Industrial Systems, LP | Wood processing oven and method |
| CN105674695A (en) * | 2016-02-23 | 2016-06-15 | 王亚萍 | Natural gas diode drying box |
| WO2017190209A1 (en) * | 2016-05-04 | 2017-11-09 | Jacques Roy | Integrated unit for treatment and drying lignocellulosic material |
| US10487283B1 (en) | 2018-03-20 | 2019-11-26 | EPCON Industrial Systems, LP | Regenerative thermal oxidizer with secondary and tertiary heat recovery |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269715A (en) * | 1964-04-02 | 1966-08-30 | Jr Walker L Wellford | Kiln furnace controller |
| US3614074A (en) * | 1969-11-14 | 1971-10-19 | Moore Dry Kiln Co | Direct-fired kiln furnace control system |
| US4098008A (en) * | 1976-11-08 | 1978-07-04 | Wellons, Inc. | Dry kiln having bidirectional air flow with unidirectional fan rotation |
| DE3340489A1 (en) * | 1983-11-09 | 1985-08-14 | Lignomat GmbH, 7148 Remseck | METHOD FOR DRYING WOOD |
| US4953298A (en) * | 1989-02-24 | 1990-09-04 | Wagner Electronic Products, Inc. | Kiln controller |
| JP2516467B2 (en) * | 1990-10-12 | 1996-07-24 | 石井 拓司 | Wood drying equipment |
| US5778557A (en) * | 1992-09-23 | 1998-07-14 | Food Plant Engineering, Inc. | Temperature and atmosphere control system for stored products |
| US5276980A (en) * | 1992-11-12 | 1994-01-11 | Carter John L | Reversible conditioned air flow system |
| SE505655C2 (en) * | 1994-02-11 | 1997-09-29 | Flaekt Ab | Process for drying wood |
| FR2720969A1 (en) * | 1994-06-14 | 1995-12-15 | Herve Montornes | Treatment of green wood |
| EP0730130B1 (en) * | 1995-03-02 | 1998-05-27 | Jiro Sato | Process and equipment for drying wood |
| FI953913A (en) * | 1995-08-21 | 1997-02-22 | Valmet Corp | Cooling method and equipment for heat drying / heat treatment of wood |
| FR2757097B1 (en) * | 1996-12-13 | 1999-01-29 | Bci | DEVICE AND METHOD FOR HIGH-TEMPERATURE TREATMENT OF LIGNOCELLULOSIC MATERIAL |
| US5878509A (en) * | 1997-03-07 | 1999-03-09 | Ifi, Inc. | Baffled wood drying kiln and process |
| US5836086A (en) * | 1997-05-21 | 1998-11-17 | Elder; Danny J. | Process for accelerated drying of green wood |
-
1999
- 1999-03-09 FR FR9903179A patent/FR2790698B1/en not_active Expired - Fee Related
-
2000
- 2000-02-29 DE DE60023444T patent/DE60023444T2/en not_active Expired - Lifetime
- 2000-02-29 WO PCT/FR2000/000492 patent/WO2000053985A1/en active IP Right Grant
- 2000-02-29 EP EP00907740A patent/EP1133666B1/en not_active Expired - Lifetime
- 2000-02-29 AT AT00907740T patent/ATE308025T1/en active
- 2000-02-29 AU AU29221/00A patent/AU2922100A/en not_active Abandoned
- 2000-02-29 ES ES00907740T patent/ES2250106T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| AU2922100A (en) | 2000-09-28 |
| DE60023444D1 (en) | 2005-12-01 |
| WO2000053985A1 (en) | 2000-09-14 |
| FR2790698B1 (en) | 2001-07-06 |
| ES2250106T3 (en) | 2006-04-16 |
| EP1133666A1 (en) | 2001-09-19 |
| FR2790698A1 (en) | 2000-09-15 |
| ATE308025T1 (en) | 2005-11-15 |
| DE60023444T2 (en) | 2006-07-20 |
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