EP0458219A1 - Dispositif pour le séchage du bois - Google Patents

Dispositif pour le séchage du bois Download PDF

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Publication number
EP0458219A1
EP0458219A1 EP91108062A EP91108062A EP0458219A1 EP 0458219 A1 EP0458219 A1 EP 0458219A1 EP 91108062 A EP91108062 A EP 91108062A EP 91108062 A EP91108062 A EP 91108062A EP 0458219 A1 EP0458219 A1 EP 0458219A1
Authority
EP
European Patent Office
Prior art keywords
air
drying chamber
heating
fans
drying
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Withdrawn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
EP91108062A
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German (de)
English (en)
Inventor
Josef Kronseder
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0458219A1 publication Critical patent/EP0458219A1/fr
Withdrawn legal-status Critical Current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
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention relates to a device for drying wood or other goods according to the preamble of claim 1.
  • DE-A-35 43 248 is a generic device, consisting of an elongated housing, a cylindrical drying chamber for receiving the material to be dried, a heating shield arranged concentrically to the drying chamber for heating air passing between the housing wall and the heating shield, which is the air to be dried Well warmed up and absorbing the escaping vapor water, a cooling device for condensing the air mixture, an air circulation device on one end of the drying chamber, which circulates the air mixture in the drying chamber past the goods, via a cooling device and heating shield, and a vacuum device for generating and maintaining a vacuum in the drying chamber.
  • the heat required for heating the material to be dried (wood) is supplied during the heating phase via the air as a heat carrier to the material in the drying chamber, preferably with wood, along the stacking direction.
  • the container is placed under vacuum.
  • the air-steam mixture which is then heavily enriched with moisture and is located in the housing or container, is arranged in the drying chamber by adding cooling water Cooling device condensed.
  • the resulting dripping water drips into a cooling water tank.
  • the slight heat consumption caused by the condensation is replaced by the heating device in the form of the concentric heating shield, namely in that the air remaining in the drying chamber is circulated with the aid of a fan as an air circulation device.
  • the container once placed under vacuum, can be closed and remain under negative pressure during the entire drying process.
  • the known device works absolutely satisfactorily in normal-sized containers. However, for reasons of rationalization, there is a desire to further enlarge the housing and thus the drying room. Certain problems arise with the air circulation device, since the pressure for the air to be circulated can no longer be applied in spite of an adequate air pressure with a larger diameter and a longer length in general with a low internal pressure (vacuum).
  • the object of the invention is to develop a device of the aforementioned type such that a sufficient amount of air can be circulated with sufficient pressure even at a vacuum of less than 300 mbar.
  • the air throughput in normal atmospheres and in vacuum operation is operated with different performance of the air circulation device in such a way that even with a low internal pressure in the drying chamber there is sufficient pressing pressure.
  • this can be done simply by the ventilator which realizes the air circulation device being in vacuum operation is operated at a higher speed and / or with fan blades adjusted in the sense of a higher air throughput.
  • a plurality of fans for the air circulation are provided, either on one end face or divided over both sir sides.
  • This embodiment offers the advantage that a relatively large area, for example up to 2.5 m, of the container can be realized in the case of relatively small areas available for the installation of the device. With such large diameters, one and only one fan could not be built so large and operated at such a high speed that the necessary air throughput with sufficient pressure is guaranteed even in the vacuum range.
  • the air circulation device consists of a plurality of individual fans which can be switched on and off on one side or divided on both end faces.
  • the heating shield by two separate parts of approximately the same size and to arrange at least one fan on each end, which work against one another.
  • a drying device which has an outer housing 1, which together with end closures, e.g. a lid that forms a container.
  • the housing 1 has an outside diameter of at least 1.5 m, but preferably between 1.7 m and 2 m.
  • the interior of the container or housing 1 is referred to as a drying room, in which there is, for example, a stack of wooden planks provided with spacing bars.
  • a heating shield 3 which extends over the entire length and is formed from two heating shield walls 3 'and 3' 'and in the interior of which heating tubes are provided, via which the heating shield 3 is heated accordingly by means of hot water. With the help of this heating shield 3, the entire drying chamber content is heated uniformly.
  • the control takes place via a thermostat (not shown) in a manner known per se.
  • At least two fans 5 are provided, which are activated simultaneously with the heating or after a corresponding preheating time and which keep the heated air inside the housing 1 under vacuum through the interstices of the stacked wood promote.
  • the heating shield 3 is arranged concentrically to the housing 1 of the drying device, an interspace 7 being left free. Through this space 7 between the heating shield 3 and an insulation 2, the air is pressed by the fans 5 or, depending on the selected direction of rotation, sucked back and it heats up again by brushing past the heating shield wall 3 '. At the same time, the heating shield wall 3 ′′ prevents the air from escaping from the drying room into the intermediate space 7. Due to the uniformly strong air circulation generated by the fans 5 through the entire stack of the wood to be dried or other goods, moisture exchange between the individual wooden planks is inevitable different humidity reached.
  • cooling pipes 8 are laid, which form a cooling device.
  • the air pressed through the drying room cools down on these cooling tubes 8, as a result of which the steam contained in the air mixture is excreted in the form of dripping water.
  • a water tank 9 receives the water created by the condensation. The water tank 9 can also be cooled in order to avoid re-evaporation in the case of prolonged operation.
  • a laterally arranged electrical control box 12 contains the control circuits for the fans 5 and the heating and vacuum devices.
  • the housing 1 preferably has a diameter of at least 1.5 m and a length of at least 12 m, lengths between 14 m and 16 m being preferred.
  • the heating shield 3 is divided into parts 3a and 3b of approximately the same size. According to this division, two drying rooms 14a and 14b are also formed, each of which is to be filled with a stack of wood to be dried.
  • the housing 1 has a door 16 which can be pivoted away at one end. The space 18 formed by the two heating plate parts 3a, 3b and the two drying rooms 14a, 14b remains free.
  • two fans 5 are arranged side by side in a plane perpendicular to the longitudinal axis of the housing 1.
  • Two further fans 5 are arranged analogously on the other end of the container or housing 1.
  • the air streams of the two cooperating fans 5 are directed so that they meet in the space 18 and are sucked back into the respective drying room 14a, 14b.
  • the heating of the air and the condensation of its water content after or during its action in the drying room takes place as described in the exemplary embodiment in FIG. 1.
  • the air circulation devices are connected to a control device which is designed for the optional connection of individual air circulation devices. This makes it possible, e.g. During the heating-up phase, when the desired end value of the vacuum has not yet been reached, only let some of the fans run and later, when working at full vacuum, switch on additional fans in order to achieve the necessary pressing pressure.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP91108062A 1990-05-22 1991-05-17 Dispositif pour le séchage du bois Withdrawn EP0458219A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9005827U DE9005827U1 (fr) 1990-05-22 1990-05-22
DE9005827U 1990-05-22

Publications (1)

Publication Number Publication Date
EP0458219A1 true EP0458219A1 (fr) 1991-11-27

Family

ID=6854033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108062A Withdrawn EP0458219A1 (fr) 1990-05-22 1991-05-17 Dispositif pour le séchage du bois

Country Status (2)

Country Link
EP (1) EP0458219A1 (fr)
DE (1) DE9005827U1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4104768C1 (fr) * 1991-02-15 1992-03-12 Josef 8313 Vilsbiburg De Kronseder
DE19522028C2 (de) * 1995-06-17 1999-12-16 Reinhard Brunner Verfahren und eine Vorrichtung zum Trocknen von Schnittholz bei Unterdruck
DE29711315U1 (de) 1997-06-28 1997-08-28 Gerl Bernhard Vorrichtung zum Trocknen
DK1593921T3 (da) 2004-05-03 2010-05-10 Schoell Albrecht Apparat til tørring af træ

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1328897A (en) * 1919-01-15 1920-01-27 Otis D Rice Method of and apparatus for drying material
FR625501A (fr) * 1926-11-30 1927-08-12 Main Et Cie G Dispositif de chauffage et de ventilation des étuves et séchoirs industriels pour séchage par le vide
FR2311637A1 (fr) * 1975-05-19 1976-12-17 Pagnozzi Ernesto Procede pour le sechage de grandes pieces en bois a des pressions sous-atmospheriques ou sous vide, en particulier pour le sechage de bois delicat et fragile
DE2806747A1 (de) * 1977-02-19 1978-08-24 Kitagawa Iron Works Co Verfahren und einrichtung zum trocknen von holz, landwirtschaftlichen erzeugnissen, toepferwaren u.dgl.
US4343095A (en) * 1981-03-24 1982-08-10 The United States Of America As Represented By The Secretary Of Agriculture Pressure dryer for steam seasoning lumber
DE3206348A1 (de) * 1981-11-03 1983-05-11 Josef 2164 Neuruppersdorf Leisser Trockenkammer fuer holz
DE3543248A1 (de) * 1985-12-06 1987-06-11 Josef Kronseder Vorrichtung zum trocknen von holz
FR2598791A1 (fr) * 1986-05-13 1987-11-20 Josef Wild Procede pour le sechage du bois et installation pour sa mise en oeuvre
CH672020A5 (en) * 1988-02-16 1989-10-13 Maspell International S R L Forced circulation wood drying cylinder - contains fans driving air towards central adjustable guide with curved faces forming cross flow

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1328897A (en) * 1919-01-15 1920-01-27 Otis D Rice Method of and apparatus for drying material
FR625501A (fr) * 1926-11-30 1927-08-12 Main Et Cie G Dispositif de chauffage et de ventilation des étuves et séchoirs industriels pour séchage par le vide
FR2311637A1 (fr) * 1975-05-19 1976-12-17 Pagnozzi Ernesto Procede pour le sechage de grandes pieces en bois a des pressions sous-atmospheriques ou sous vide, en particulier pour le sechage de bois delicat et fragile
DE2806747A1 (de) * 1977-02-19 1978-08-24 Kitagawa Iron Works Co Verfahren und einrichtung zum trocknen von holz, landwirtschaftlichen erzeugnissen, toepferwaren u.dgl.
US4343095A (en) * 1981-03-24 1982-08-10 The United States Of America As Represented By The Secretary Of Agriculture Pressure dryer for steam seasoning lumber
DE3206348A1 (de) * 1981-11-03 1983-05-11 Josef 2164 Neuruppersdorf Leisser Trockenkammer fuer holz
DE3543248A1 (de) * 1985-12-06 1987-06-11 Josef Kronseder Vorrichtung zum trocknen von holz
FR2598791A1 (fr) * 1986-05-13 1987-11-20 Josef Wild Procede pour le sechage du bois et installation pour sa mise en oeuvre
CH672020A5 (en) * 1988-02-16 1989-10-13 Maspell International S R L Forced circulation wood drying cylinder - contains fans driving air towards central adjustable guide with curved faces forming cross flow

Also Published As

Publication number Publication date
DE9005827U1 (fr) 1990-08-23

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