FR2660424A1 - Method and installation for drying damp solid wood with a high throughput - Google Patents

Method and installation for drying damp solid wood with a high throughput Download PDF

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Publication number
FR2660424A1
FR2660424A1 FR9004260A FR9004260A FR2660424A1 FR 2660424 A1 FR2660424 A1 FR 2660424A1 FR 9004260 A FR9004260 A FR 9004260A FR 9004260 A FR9004260 A FR 9004260A FR 2660424 A1 FR2660424 A1 FR 2660424A1
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FR
France
Prior art keywords
wood
drying
installation
ves
cell
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.)
Withdrawn
Application number
FR9004260A
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French (fr)
Inventor
Vanacker Michel
Costa Philippe
Basilico Christian
Martin Maurice
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Electricite de France SA
Nordon et Cie
Original Assignee
Electricite de France SA
Nordon et Cie
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 Electricite de France SA, Nordon et Cie filed Critical Electricite de France SA
Priority to FR9004260A priority Critical patent/FR2660424A1/en
Priority to FI905972A priority patent/FI905972A/en
Publication of FR2660424A1 publication Critical patent/FR2660424A1/en
Withdrawn legal-status Critical Current

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/16—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by wheeled trucks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • 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

Abstract

Method for drying damp solid wood continuously by convection in a tunnel drier, characterised in that superheated steam (VES) coming from the wood is used as a heating fluid, at a pressure slightly above atmospheric pressure, the circulation of which is forced through stacks of planks of wood separated by laths. The invention also relates to an installation for the implementation of this method, and, by way of a secondary consideration, to a mechanical steam compression system (CMV).

Description

Procédé et installation pour le séchage à grand débit de bois massif humide.Process and installation for high-throughput drying of wet solid wood.

La présente invention concerne un procédé et une installation pour un séchage rapide et en continu des grands débits de bois massif humide. The present invention relates to a method and an installation for rapid and continuous drying of large flows of wet solid wood.

Actuellement le séchage du bois de construction, en particulier sous forme de planches, s'effectue le plus souvent avec de l'air chaud et nécessite des durées de séchage pouvant atteindre plusieurs jours. L'humidité résiduelle du bois est souvent excessive, de même que les rebuts à cause des déformations, des fentes, fissures ou gerces externes ou internes, ou encore à cause d'un décollement des noeuds. Currently the drying of construction wood, in particular in the form of boards, is most often carried out with hot air and requires drying times which can reach several days. The residual moisture of the wood is often excessive, as well as the rejects because of deformations, cracks, cracks or external or internal checks, or even because of a detachment of the knots.

Le but de la présente invention est de remédier aux inconvénients des techniques antérieures, et d'obtenir aussi une plus grande rapidité du séchage, une augmentation substantielle des débits de bois séché et une faible humidité résiduelle, celle-ci devant en outre être uniformément répartie dans chaque planche. Il convient aussi d'éviter les défauts du bois constatés jusqu'à présent et qui viennent d'être rappelés. The object of the present invention is to remedy the drawbacks of the prior techniques, and also to obtain a greater speed of drying, a substantial increase in the flow rates of dried wood and a low residual humidity, the latter also having to be uniformly distributed. in each board. It is also advisable to avoid the defects of wood noted until now and which have just been recalled.

A cet effet, un procédé conforme à la présente invention est essentiellement caractérisé en ce que l'on utilise comme fluide séchant de la vapeur d'eau surchauffée (VES) à pression légèrement supérieure à la pression atmosphérique, et dont la circulation est forcée au moyen de ventilateurs à travers des piles de planches de bois séparées par des tasseaux, pour atteindre une vitesse de l'ordre de 4 à 8 m/s. To this end, a process in accordance with the present invention is essentially characterized in that superheated water vapor (VES) is used as drying fluid at a pressure slightly above atmospheric pressure, the circulation of which is forced to fans using stacks of wooden planks separated by cleats, to reach a speed of the order of 4 to 8 m / s.

Cette vapeur surchauffée est issue de l'eau vaporisée du bois surchauffée par apport calorifique extérieur. De préférence, l'installation présente la configuration d'un tunnel. This superheated steam comes from the water vaporized from the wood superheated by external calorific contribution. Preferably, the installation presents the configuration of a tunnel.

Avec cette technique, on peut atteindre un débit de bois séché de l'ordre de 18 000 à 50 000 m3/an.  With this technique, we can achieve a flow rate of dried wood of the order of 18,000 to 50,000 m3 / year.

Le procédé conforme à l'invention est également intéressant du point de vue énergétique, comme cela sera vu plus bas. The process according to the invention is also advantageous from the energy point of view, as will be seen below.

On constate par ailleurs que grâce à l'utilisation de VES aux températures envisagées - de l'ordre de 120 à 1600C - le bois est amené dans un état plastique transitoire favorable, ce qui explique en particulier que les noeuds ne se décollent plus. We also note that thanks to the use of VES at the envisaged temperatures - of the order of 120 to 1600C - the wood is brought into a favorable transient plastic state, which explains in particular that the knots no longer come off.

Avantageusement aussi, un procédé conforme à l'invention pourra se caractériser en ce que, par rapport au sens de déplacement du bois dans ledit séchoir-tunnel, la circulation de ladite VES est forcée à cocourant, c'est-à-dire dans le même sens. Advantageously also, a process in accordance with the invention can be characterized in that, with respect to the direction of movement of the wood in said dryer-tunnel, the circulation of said VES is forced to cocurrent, that is to say in the Same direction.

On distingue généralement, pour l'eau contenue dans le bois, l'eau libre et l'eau liée. A general distinction is made, for water contained in wood, between free water and bound water.

Grâce à la disposition définie ci-dessus, c'est-à-dire circulation à cocourant, on obtient globalement l'évaporation préalable de l'eau libre à une température supérieure à celle où est ensuite produite l'évaporation de l'eau liée, ce qui est encore favorable à une bonne qualité du bois séché. Thanks to the arrangement defined above, that is to say cocurrent circulation, the prior evaporation of the free water is generally obtained at a temperature higher than that where the evaporation of the bound water is then produced. , which is still favorable to good quality dried wood.

La présente invention concerne encore une installation de séchage destinée à mettre en oeuvre le procédé ci-dessus défini. The present invention also relates to a drying installation intended to implement the process defined above.

A cet effet, une installation de séchage conforme à l'invention est essentiellement caractérisée en ce que ledit séchoir-tunnel est constitué d'une cellule de séchage composée de deux aires de stationnement, étanche par rapport à l'environnement, précédée d'un sas d'entrée et suivie d'un sas de sortie dans lesquels se succèdent des charges de planches de bois empilées en couches espacées par des tasseaux, ces piles étant chargées sur des cadres ou des chariots ou wagonnets propres à stationner les temps nécessaires en différentes zones du séchoir. To this end, a drying installation in accordance with the invention is essentially characterized in that said tunnel dryer consists of a drying cell composed of two parking areas, sealed from the environment, preceded by a entry airlock and followed by an exit airlock in which successive loads of wooden planks stacked in layers spaced by battens, these piles being loaded on frames or trolleys or wagons suitable for parking the necessary times in different dryer areas.

Ainsi, les deux opérations consécutives mentionnées plus haut (évaporation de l'eau libre puis évaporation de l'eau liée) auront lieu pour chaque chariot en deux zones de stationnement qui se succèdent dans la cellule de séchage, dans le même sens que celui de la circulation de la vapeur surchauffée de séchage. Thus, the two consecutive operations mentioned above (evaporation of free water then evaporation of bound water) will take place for each trolley in two parking zones which follow one another in the drying cell, in the same direction as that of circulation of superheated drying steam.

La cellule de séchage étanche est de préférence protégée des excès de différence de pression avec l'environnement par un système de garde hydraulique.The sealed drying cell is preferably protected from excess pressure difference with the environment by a hydraulic guard system.

D'autres caractéristiques d'une installation conforme à l'invention vont maintenant apparaitre dans la description qui suit d'un exemple de réalisation nullement limitatif, faite avec référence aux figures du dessin annexé dans lequel
- la figure 1 est une vue schématique en coupe de l'ensemble de l'installation à séchoir-tunnel ; et
- la figure 2 montre un système à compression mécanique de vapeur, utilisable dans cette installation.Other characteristics of an installation in accordance with the invention will now appear in the following description of an exemplary embodiment which is in no way limitative, made with reference to the figures of the appended drawing in which
- Figure 1 is a schematic sectional view of the entire dryer-tunnel installation; and
- Figure 2 shows a mechanical vapor compression system, usable in this installation.

Sur les figures, les références PO, P1, P2, P3 et P4 désignent les empilages de planches de bois à sécher, dans les différentes étapes successives de leur séchage. Le processus est quasi-continu, à savoir que quand une pile PO se trouve dans le sas d'entrée 1, les piles précédentes P1 et P2 se trouvent dans la cellule de séchage 2, et les piles encore précédentes P3 et P4 se trouvent dans le sas de sortie 3. Dans la cellule de séchage, les deux aires de stationnement mentionnées plus haut correspondent aux emplacements respectifs des piles P1 et P2 et sont à des températures différentes. In the figures, the references PO, P1, P2, P3 and P4 denote the stacks of wooden boards to be dried, in the various successive stages of their drying. The process is almost continuous, namely that when a PO cell is in the airlock 1, the previous cells P1 and P2 are in the drying cell 2, and the still previous cells P3 and P4 are in the exit airlock 3. In the drying cell, the two parking areas mentioned above correspond to the respective locations of the batteries P1 and P2 and are at different temperatures.

Dans cette même figure 1, V désigne le ventilateur de mise en circulation de la vapeur surchauffée, et E désigne un échangeur de chaleur. Les mêmes références ont été adoptées sur la figure 2. In this same figure 1, V denotes the fan for circulating the superheated steam, and E denotes a heat exchanger. The same references have been adopted in FIG. 2.

Le sas d'entrée 1 constitue une zone de premier stationnement dans laquelle la température du bois est élevée, aux environs de 100"C. L'apport de chaleur nécessaire s'effectue par condensation de vapeur d'appoint. Cette phase de préchauffage permet l'élimination d'une partie de certains constituants du bois tels que résines, tanins, gaz incondensables. The entrance airlock 1 is a first parking zone in which the temperature of the wood is high, around 100 "C. The necessary heat supply is made by condensation of make-up steam. This preheating phase allows the elimination of part of certain components of the wood such as resins, tannins, noncondensable gases.

Le sas de sortie constitue une zone de stationnement final pendant lequel il y a homogénéisation des humidités résiduelles au sein de chaque planche de bois et entre les diverses planches. L'ajustement de la température dans le sas de sortie permet l'ajustement de l'humidité résiduelle selon une équation hygroscopique. The exit airlock constitutes a final parking area during which there is homogenization of the residual humidity within each wooden board and between the various boards. The adjustment of the temperature in the exit airlock allows the adjustment of the residual humidity according to a hygroscopic equation.

Une ventilation forcée permet le cas échéant de favoriser le processus d'équilibrage. Forced ventilation allows, if necessary, to favor the balancing process.

La régulation du processus fonctionne de la façon suivante
Le débit principal de vapeur Q (figure 2) se désurchauffe à travers la pile P1 de la température T1 à la température T2, puis à travers la pile P2 de la température T2 à la température T3.Process control works as follows
The main steam flow Q (FIG. 2) is desuperheated through the stack P1 from temperature T1 to temperature T2, then through the stack P2 from temperature T2 to temperature T3.

La connaissance de la désurchauffe (T1 - T3) du débit Q permet de connaitre l'humidité résiduelle de la pile P2. Lorsque la désurchauffe T1 - T3 descend audessous d'une valeur déterminée, une translation des chariots est automatiquement commandée. La pile P4 (figure 1) est extraite du séchoir, chaque pile se déplaçant d'une zone amont à la zone aval immédiate. Une nouvelle pile PO est introduite dans le sas d'entrée 1. Knowledge of the desuperheating (T1 - T3) of the flow Q makes it possible to know the residual humidity of the cell P2. When the desuperheating T1 - T3 drops below a determined value, a translation of the carriages is automatically controlled. The stack P4 (Figure 1) is extracted from the dryer, each stack moving from an upstream area to the immediate downstream area. A new PO battery is inserted in the entrance airlock 1.

Le débit de vapeur q représente la quantité d'eau évaporée du bois extraite pour que la pression interne 2 reste constante.The steam flow q represents the amount of water evaporated from the wood extracted so that the internal pressure 2 remains constant.

L'apport énergétique s'effectue par cession de chaleur dans l'échangeur E. Il s'agit habituellement de condensation de vapeur d'eau à une pression suffisante pour que la température T1 soit comprise entre 130 et 1600C adaptée au bois massif à sécher. Afin de diminuer la consommation d'énergie, on peut utiliser un système de compression mécanique de vapeur (CMV) du débit de vapeur q éventuellement augmenté d'un appoint. Cette vapeur est comprimée par un compresseur C puis condensée dans l'échangeur E. Dans ce cas, la pression p dans le séchoir est maintenue constante en agissant sur la variation du débit à l'aspiration du compresseur. La pression de refoulement du compresseur est réglée par un soutirage de vapeur et éventuellement de gaz incondensables en provenance du bois. Ce soutirage est renvoyé vers le sas d'entrée 1 pour participer au préchauffage du bois.  The energy supply takes place by transfer of heat in the exchanger E. It is usually condensation of water vapor at a sufficient pressure so that the temperature T1 is between 130 and 1600C suitable for solid wood to be dried . In order to reduce energy consumption, it is possible to use a mechanical vapor compression system (CMV) of the vapor flow q possibly increased by an addition. This vapor is compressed by a compressor C and then condensed in the exchanger E. In this case, the pressure p in the dryer is kept constant by acting on the variation of the flow rate at the suction of the compressor. The discharge pressure of the compressor is regulated by drawing off steam and possibly noncondensable gases from the wood. This racking is returned to the entry airlock 1 to participate in the preheating of the wood.

Claims (8)

REVENDICATIONS 1. Procédé pour le séchage de bois massif humide par convection dans un séchoir-tunnel, caractérisé en ce que l'on utilise comme fluide séchant de la vapeur d'eau surchauffée (VES) à pression légèrement supérieure à la pression atmosphérique, dont la circulation est forcee à travers des piles de planches de bois séparées par des tasseaux. 1. A method for drying wet solid wood by convection in a tunnel dryer, characterized in that superheated water vapor (VES) is used as the drying fluid at a pressure slightly above atmospheric pressure, the circulation is forced through stacks of wooden planks separated by battens. 2. Procédé selon la revendication 1, caractérisé en ce que la circulation de la VES entre les planches de bois est forcée au moyen d'un ou de plusieurs ventilateurs, pour atteindre une vitesse de l'ordre de 4 à 8 m/s. 2. Method according to claim 1, characterized in that the circulation of the VES between the wooden boards is forced by means of one or more fans, to reach a speed of the order of 4 to 8 m / s. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la température de la VES est de l'ordre de 120 à 160 C environ. 3. Method according to claim 1 or 2, characterized in that the temperature of the VES is around 120 to 160 C. 4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, par rapport au sens de déplacement du bois dans ledit séchoir-tunnel, la circulation de ladite VES est forcée à cocourant, c'est-à-dire dans le même sens. 4. Method according to any one of the preceding claims, characterized in that, with respect to the direction of movement of the wood in said tunnel dryer, the circulation of said VES is forced to cocurrent, that is to say in the Same direction. 5. Installation pour la mise en oeuvre d'un procédé conforme à l'une quelconque des revendications précédentes, caractérisée en ce que ledit séchoir tunnel est constitué d'une cellule de séchage composée de deux aires de stationnement, étanche par rapport à l'environnement, précédée d'un sas d'entrée et suivie d'un sas de sortie dans lesquels se succèdent des charges de planches de bois empilées en couches espacées par des tasseaux, ces piles étant chargées sur des cadres ou chariots ou wagonnets propres à stationner les temps nécessaires en différentes zones du séchoir. 5. Installation for the implementation of a method according to any one of the preceding claims, characterized in that said tunnel drier consists of a drying cell composed of two parking areas, sealed relative to the environment, preceded by an entry airlock and followed by an exit airlock in which successive loads of wooden planks stacked in layers spaced by cleats, these piles being loaded on frames or carts or wagons suitable for parking times required in different areas of the dryer. 6. Installation selon la revendication 5, caractérisée en ce qu'elle comporte un dispositif de commande automatique du transfert des piles de bois quand la différence des températures (T1-T3) régnant entre l'entrée et la sortie de cette cellule descend au-dessous d'une valeur déterminée, chaque pile (PO, Pî..) se déplaçant alors d'une zone à la zone immédiatement en aval. 6. Installation according to claim 5, characterized in that it comprises an automatic control device for the transfer of the stacks of wood when the difference in temperatures (T1-T3) prevailing between the inlet and the outlet of this cell drops to- below a determined value, each stack (PO, Pî ..) then moves from one zone to the zone immediately downstream. 7. Installation selon la revendication 5 ou 6, caractérisée en ce qu'elle comporte un compresseur (C) de vapeur alimenté par un débit (q) de vapeur provenant de ladite cellule (2) de séchage, ce compresseur (C) alimentant un échangeur de chaleur (E) disposé sur le trajet de circulation de la vapeur (Q) à l'intérieur de ladite cellule, de la chaleur étant ainsi récupérée dans l'échangeur, par condensation de la vapeur (q) sortant du compresseur, la pression (p) dans ladite cellule restant sensiblement constante. 7. Installation according to claim 5 or 6, characterized in that it comprises a steam compressor (C) supplied by a flow rate (q) of steam coming from said drying cell (2), this compressor (C) supplying a heat exchanger (E) arranged on the vapor circulation path (Q) inside said cell, heat is thus recovered in the exchanger, by condensation of the vapor (q) leaving the compressor, the pressure (p) in said cell remaining substantially constant. 8. Installation selon la revendication 7, caractérisée en ce qu-'elle comporte une liaison de soutirage entre la sortie de l'échangeur (E) et ledit sas d'entrée (1) pour assurer le préchauffage du bois.  8. Installation according to claim 7, characterized in that it comprises a withdrawal connection between the outlet of the exchanger (E) and said inlet airlock (1) to preheat the wood.
FR9004260A 1990-04-03 1990-04-03 Method and installation for drying damp solid wood with a high throughput Withdrawn FR2660424A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9004260A FR2660424A1 (en) 1990-04-03 1990-04-03 Method and installation for drying damp solid wood with a high throughput
FI905972A FI905972A (en) 1990-04-03 1990-12-04 FOERFARANDE OCH ANLAEGGNING FOER TORKNING AV MASSIVT FUKTIGT TRAE MED HOEG HASTIGHET.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896033A1 (en) * 2006-01-10 2007-07-13 Bio 3D Applic Soc Par Actions SYSTEM AND METHOD FOR DRYING WOOD.
CN110877391A (en) * 2019-11-27 2020-03-13 湖南威达尔木业科技有限公司 Continuous wood modification heat treatment process and system

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FR1541082A (en) * 1966-08-22 1968-10-04 Svenska Flaektfabriken Ab Method and apparatus for drying timber in a tunnel
US3680219A (en) * 1970-09-22 1972-08-01 Us Agriculture Process for steam straightening and kiln drying lumber
US3744144A (en) * 1971-04-23 1973-07-10 H Weis Automated controls for lumber drying kiln
US3757428A (en) * 1972-06-28 1973-09-11 D Runciman Method and apparatus for drying lumber
FR2278048A1 (en) * 1974-07-11 1976-02-06 Vanicek Viktor Drying installation partic. for wooden components - has drying chamber subdivided and has thermal and moisture control devices
FR2386001A1 (en) * 1977-03-31 1978-10-27 Electricity Council DRYING OF MATERIAL BY PASSING THROUGH A CHAMBER WITH OVERHEATED VAPOR CIRCULATION
DE2832394A1 (en) * 1977-07-27 1979-02-22 Herbert Dipl Ing Sturany Drier for stacked timber - has arrays of nozzles to discharge air-stream mixt. or pure steam into gaps between stack layers
FR2422915A1 (en) * 1978-04-13 1979-11-09 Pagnozzi Vincenzo PROCESS AND INSTALLATION USING A SUPERHEATED STEAM SYSTEM FOR DRYING SOLID WOOD
FR2524129A1 (en) * 1982-03-26 1983-09-30 Bertin & Cie Moisture extn. by contacting with superheated steam in closed circuit - the superheater recuperating latent heat from mechanically compressed satd. steam
WO1985002250A1 (en) * 1983-11-15 1985-05-23 Tekma Oy Procedure for controlling the operation of a drive-through chamber type timber drying kiln
EP0292717A2 (en) * 1987-05-26 1988-11-30 Brunner Trockentechnik Gmbh Timber drying device

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1541082A (en) * 1966-08-22 1968-10-04 Svenska Flaektfabriken Ab Method and apparatus for drying timber in a tunnel
US3680219A (en) * 1970-09-22 1972-08-01 Us Agriculture Process for steam straightening and kiln drying lumber
US3744144A (en) * 1971-04-23 1973-07-10 H Weis Automated controls for lumber drying kiln
US3757428A (en) * 1972-06-28 1973-09-11 D Runciman Method and apparatus for drying lumber
FR2278048A1 (en) * 1974-07-11 1976-02-06 Vanicek Viktor Drying installation partic. for wooden components - has drying chamber subdivided and has thermal and moisture control devices
FR2386001A1 (en) * 1977-03-31 1978-10-27 Electricity Council DRYING OF MATERIAL BY PASSING THROUGH A CHAMBER WITH OVERHEATED VAPOR CIRCULATION
DE2832394A1 (en) * 1977-07-27 1979-02-22 Herbert Dipl Ing Sturany Drier for stacked timber - has arrays of nozzles to discharge air-stream mixt. or pure steam into gaps between stack layers
FR2422915A1 (en) * 1978-04-13 1979-11-09 Pagnozzi Vincenzo PROCESS AND INSTALLATION USING A SUPERHEATED STEAM SYSTEM FOR DRYING SOLID WOOD
FR2524129A1 (en) * 1982-03-26 1983-09-30 Bertin & Cie Moisture extn. by contacting with superheated steam in closed circuit - the superheater recuperating latent heat from mechanically compressed satd. steam
WO1985002250A1 (en) * 1983-11-15 1985-05-23 Tekma Oy Procedure for controlling the operation of a drive-through chamber type timber drying kiln
EP0292717A2 (en) * 1987-05-26 1988-11-30 Brunner Trockentechnik Gmbh Timber drying device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2896033A1 (en) * 2006-01-10 2007-07-13 Bio 3D Applic Soc Par Actions SYSTEM AND METHOD FOR DRYING WOOD.
WO2007080318A2 (en) * 2006-01-10 2007-07-19 Bio 3D Applications System and method for drying wood
WO2007080318A3 (en) * 2006-01-10 2007-09-13 Bio 3D Applic System and method for drying wood
US8844159B2 (en) 2006-01-10 2014-09-30 Holcop System and method for drying wood
CN110877391A (en) * 2019-11-27 2020-03-13 湖南威达尔木业科技有限公司 Continuous wood modification heat treatment process and system

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FI905972A0 (en) 1990-12-04
FI905972A (en) 1991-10-04

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