Abstract
The invention relates to a device for drying wood, comprising: a container (1) for accommodating the wood (2) and a plate (4, 4′, 4″) forming a wall (3) of the container (1, 1′, 1″, 1″), wherein the plate (4) can be heated and wood (2) at least partially lies against the plate (4).
Claims
1. A wood drying device, comprising: a tiltably mounted receptacle having a floor; a heating system; and a plate heatable by said heating system to radiate heat, said plate forming a wall of said receptacle substantially perpendicular to said floor, said plate being arranged such that wood comprising at least one of logs and split logs received in said receptacle lies at least partially against said plate; said tiltably mounted receptacle being tiltable from a configuration in which said floor is substantially horizontal to a configuration in which said floor is significantly angled relative to horizontal to ease unloading of said wood from said receptacle.
2. The device of claim 1, said heating system comprising: at least one pipe connectable to a source of heated fluid and arranged to transfer heat from said fluid to said plate.
3. The device of claim 2, wherein said at least one pipe is welded to said plate.
4. The device of claim 3, comprising, for at least one of said at least one pipe, a first weld connecting a first side of the respective pipe to said plate and a second weld connecting a second side of the respective pipe to said plate.
5. A wood drying device, comprising: a drying chamber; a heating system; and a tiltably mounted plate for supporting wood comprising at least one of logs and split logs in said drying chamber, said plate being heatable by said heating system to radiate heat for drying said wood, and said plate being tiltable from a horizontal position to a tilted position.
6. The device of claim 5, comprising: a conveyor for conveying wood from said drying chamber, wherein said conveyor is arranged below said plate such that wood lying on said plate slides, in said tilted position, onto said conveyor.
7. A wood drying device, comprising: a drying chamber; a heating system; a plate for supporting wood comprising at least one of logs and split logs in said drying chamber; and an actuator, wherein said plate is heatable by said heating system to radiate heat for drying said wood, and said plate is movable in a horizontal direction by said actuator such that at least a portion of said plate is moved from a position within said drying chamber to a position outside said drying chamber.
8. The device of claim 7, comprising, above said plate, a plurality of heatable plates, each for supporting a supply of wood in said drying chamber.
9. The device of claim 7, comprising: a conveyor arranged inside said drying chamber, wherein said plate is positioned relative to said conveyor such that wood arranged on said plate falls onto said conveyor when said plate is moved from said drying chamber by said actuator.
10. A wood drying method, comprising: placing wood comprising at least one of logs and split logs in a receptacle; introducing heat via heatable plates arranged in said receptacle, the heatable plates being heated to a temperature selected from the group of less than 150° C. and less than 90° C., heating a volume of ambient air to a temperature selected from the group of below 80° C., below 70° C., and below 60° C., and introducing said heated volume of ambient air into said receptacle.
11. The method of claim 10, wherein said introduction of heat extends over a time period in a range selected from the group of one to six days and one to four days, and said venting extends over a time period in a range selected from the group of one to ten days and two and eight days.
Description
(1) In the following, embodiments will be explained in more detail with reference to the drawings. Shown are:
(2) FIG. 1: schematically in a side view an embodiment of a container for drying wood with heatable plates arranged thereon,
(3) FIG. 2: schematically a cross-section of the container, marked in FIG. 1 with “A”,
(4) FIG. 3: schematically a cross-section of the container, marked in FIG. 1 with “B”,
(5) FIG. 4: schematically in a cross-sectional top view a drying chamber for drying wood with containers, a heating facility, a flow line for heated water and a return line for chilled water arranged therein,
(6) FIG. 5: schematically a side view of an embodiment with a tiltable container that is in a tilted position,
(7) FIG. 6: schematically a cross-section through the container with wood arranged within,
(8) FIG. 7: schematically a side view of the tilted container that is in a horizontal position,
(9) FIG. 8: schematically in cross-section an embodiment of a device for drying wood with tiltable heatable plates and a conveyor, wherein the plates are in a horizontal position,
(10) FIG. 9: schematically in cross-section the device for drying wood shown in FIG. 8 in a state where the plates are in a tilted position and on the plates arranged wood slides onto the conveyor,
(11) FIG. 10: schematically in cross-section a further embodiment of a device for drying wood with a plurality of plates arranged on top of each other, which can sideways be pulled out from the container over actuators,
(12) FIG. 11: schematically in cross-section the embodiment shown in FIG. 10, where the plates are pulled out sideways and wood arranged on them falls onto a conveyor,
(13) FIG. 12: a detailed view marked with “X” in FIG. 3 with a pipe welded onto the plate.
(14) In the drawings, some or similar elements, respectively, are provided partly with the same reference numerals.
(15) FIG. 1 shows from a side view a container 1, which is adapted for receiving wood (2). The container 1 is constructed essentially prismatic from a plurality of walls 3. At least one wall 3 that comes directly in contact with the wood 2 is designed as a heatable plate 4. For heating plate 4, there is a meandering pipe 5 welded to the plate 4. The pipe 5 is flowable through with a heated fluid, particularly water. During operation the heated fluid transfers heat to the pipe 5. The so heated pipe 5 transfers the heat to plate 4. Accordingly, plate 4 is heatable. Between the plates 4 there are free spaces 8 for venting the container 1. It is provided that at least two opposite sides and, therefore, a left and right side or an upper and a lower side are permeable to air. Optimal results can be achieved when all sides are permeable to air. The free spaces 8 improve the process of removal of humid air.
(16) The pipe 5 can be connected with a conduit, in particular a flexible conduit, in a manner not shown. According to an embodiment the pipe 5 can be separated from the conduit to transport or move the container 1 for filling with the wood to be dried and for emptying the dried wood and for tilting. The transport can, for example, be done with a forklift truck, that has rotatable forks. The pipe 5 can be shut off using ball valves 6, such that the water within the pipe does not leak during the transport. To facilitate the lifting and transport of the container 1 with the forklift truck, steel profiles 10, which are also closed below, are provided in a bottom region 11 such that the container 1 can be rotated on the forks of the fork lift truck to discharge dried wood 2.
(17) FIG. 2 shows schematically a cross-section of the container 1, marked in FIG. 1 with “A”. An air permeable bottom 7 is arranged in the bottom region 11. The air permeability is achieved with spaced profile members.
(18) FIG. 3 shows schematically a cross-section of the container 1, marked in FIG. 1 with “B”. The container 1 includes two chambers 12 for receiving the wood 2. At two outside positioned plates 4 pipes 5 are arranged on the side facing away from the wood 2. At an inside positioned plate 4′ the pipes 5 are mounted on a side facing the wood 2. The pipes 5 are covered with a V-shaped protective sheet 13 such that the wood does not damage the pipes 5 during the filling or emptying, respectively, of the container 1.
(19) An enlarged area that is marked with “X” in FIG. 3 is illustrated in FIG. 12. It can be seen that the pipes 5 are connected with the plates 4 via a welding 14. The welding 14 is formed by two weld seams 15 that run parallel to the pipes 5. The weld seams 15 serve both for mechanical fixation of the pipes 5 to the plates 4 and also for improving the heat transfer from the pipes 5 to the plates. The weld seams are applied relatively bulky, such that they cover nearly half of the surface 16 of a pipe 5 and cover a possibly large area in the region of a connection 17 of the weld seam 15 to the plate 4. This embodiment enables a high heat transfer Q′ from the pipes 5 or the therein positioned water, respectively, to the plates 4. The plates 4 transfer the heat immediately to the wood 2. The heat transfer takes place mainly through heat radiation, heat conduction, and heat transfer by convection and this in close proximity to the wood such that losses can be kept low.
(20) For industrial use, a container 1 may have a height between 0.2 and 3.2 m, particularly between 0.5 and 3 m, a width between 1 and 4.2 m, particularly between 1.2 and 4 m and a depth between 0.2 and 3.3 m, particularly between 0.5 and 3 m. For these dimensions, a pipe length of the meandering and in the above mentioned manner welded pipe 5 of about 15 to 30 m is suitable for realizing a large heat transfer from the water to the wood.
(21) FIG. 4 shows in a partially sectioned view schematically a device for drying wood including a drying chamber 18, which is insolated towards the outside with insulation panels 19. Within the drying chamber 18, there are several containers 1 arranged, which are provided as already described. The containers 1 are connected with a heating facility 22 via a flow line 20 and a return line 21. The heating facility 22 includes a solid fuel burner 23, in which an inflammable material, particularly wood, can be burned, in a manner not shown, to heat the water. For example, wood chips with an automatic feeder may be used for heating and/or a biogas plant. In two buffer reservoirs 25, shown in a top view, heated water can be accumulated. The heated water reaches the flow line 20 through pumps 24. From the flow line 20, heated water is diverted and directed to the pipes 5 of each container 1. Valves, which are not shown and which may be manually or automatically opened and closed completely or partially, may be provided for uniform distribution of the heat to the containers 1. Through the return line 21 cooled water gets back into the heating facility 22 (two-pipe-system). Nevertheless, if desired, a one-pipe-system that is not shown in the drawings may be utilized. The described heating facility 22 may also be used for heating the drying chambers 18′, 18″, and 18″′, as shown in FIGS. 5 to 11. It is considered to be particularly advantageous that die heat is transferred directly to the wood and water is used as an intermediate medium, which transfers heat virtually without loss and, thus, directly from the heating facility to the wood.
(22) FIG. 5 shows a tiltable drying chamber 18′ in a tilted position. A plurality of heatable plates 4 are arranged within the drying chamber 18′. The entire drying chamber 18′ may be tilted using a hydraulic cylinder 26 such that the wood 2 may be unloaded easily. FIG. 6 shows the drying chamber 18′ illustrated in FIG. 5 in a front vie. the drying chamber 18′ includes a plurality of continuous chambers 12′. FIG. 7 shows the container 1′ in a non-tilted, horizontal position.
(23) FIG. 8 shows a further embodiment of a drying chamber 18″ having tiltable plates 4′. The plates 4′ are tiltably connected with the walls 3′ of the drying chamber 18″ and may be tilted by an actuator 27 from a horizontal position, illustrated in FIG. 8, to a tilted position, illustrated in FIG. 9. The actuator 27 may, for example, be comprised of a hydraulic or pneumatic cylinder. The drying chamber 18″ includes at least two plates 4′ arranged at opposite walls 3′. The plates 4′ include at their bottom side pipes 5, where heated water can flow through in a manner already described. A conveyor 28 is arranged immediately beneath the plates 4′ that can transport wood from the drying chamber 18′ via a rotating belt 29. The plates 4′ are positioned relative to the conveyor 28 at the walls 3′ such that wood arranged on them falls onto the conveyor 28, see FIG. 9. With this configuration, the drying process can be at least partially automated, since the wood 2 to be unloaded can be removed from the drying chamber 18″ without manual intervention.
(24) The FIGS. 10 and 11 show in a further embodiment a drying chamber 18″ having a plurality of plates 4″ that can be pulled out from the container 1″′ or drying chamber 18″′, respectively. The plates 4″ are longitudinally movable arranged in opposite walls 3″ of the container 1″′. The plated 4″ can be pulled out via an actuator 30, as shown in FIG. 11. The actuator 30 may be comprised of a hydraulic or pneumatic cylinder, a linear drive, or a rack and pinion. To unload the container the plates 4″ may be pulled out via the actuators 30. The wood 2 falls onto a conveyor 28 such that it can be transported from the container 1″′. To ensure that no wood 2 falls next to the conveyor 28, inclined guiding sheets 31 are provided.
LIST OF REFERENCE NUMERALS
(25) 1 container 2 wood 3 wall 4 plate 4′ plate 4″ plate 4″′ plate 5 pipe 6 ball valve 7 bottom 8 free space 9 profile element 10 steel profile 11 bottom region 12 chamber 12′ chamber 13 protective sheet 14 welding 15 weld seam 16 surface 17 connection 18 drying chamber 18′ drying chamber 18″ drying chamber 18′″ drying chamber 19 insulation panel 20 flow line 21 return line 22 heating facility 23 solid fuel burner 24 pump 25 buffer reservoir 26 hydraulic cylinder 27 actuator 28 conveyor 29 belt 30 actuator 31 guiding sheet
