WO2001059378A2 - Vacuum-operated drying device, especially for sawn timber - Google Patents
Vacuum-operated drying device, especially for sawn timber Download PDFInfo
- Publication number
- WO2001059378A2 WO2001059378A2 PCT/EP2001/000893 EP0100893W WO0159378A2 WO 2001059378 A2 WO2001059378 A2 WO 2001059378A2 EP 0100893 W EP0100893 W EP 0100893W WO 0159378 A2 WO0159378 A2 WO 0159378A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- drying device
- drying
- bars
- support structure
- longitudinal
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
-
- 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
Definitions
- Vacuum drying device especially for sawn timber
- the invention relates to a drying device with negative pressure operation, in particular for sawn timber, with at least one drying chamber which can be heated via a heating device and which is surrounded by chamber walls which are partially supported by a support structure.
- drying devices are freely available in a variety of forms on the market.
- Today, technical wood drying can be carried out using various processes.
- the so-called conventional drying with fresh and exhaust air, only condensation and vacuum drying devices have an economically relevant meaning.
- the type of wood, wood thickness, initial and final moisture as well as the energy and environmental situation including the required daily output and drying quality determine the suitable process with the respective device, whereby vacuum drying is becoming increasingly established.
- the relevant support structure is designed as a truss structure and forms a kind of partition that divides the dryer chamber into two or more sub-rooms.
- the gaseous drying medium is exchanged via the vacant positions within the framework support structure.
- the relevant support structure in the known drying device also supports the front drying chamber walls when they are in operation, which at least partially form openable and closable chamber doors in order to be able to insert and remove the sawn timber in this way.
- the known drying device In addition to this truss support structure, separate so-called heating registers are arranged within the known drying device, which heat the drying device; However, as independent components within the dryer they take up a relatively large amount of installation space and can thus reduce the theoretical usable volume for the sawn timber. Furthermore, the known drying device is connected to a vacuum device and there is a possibility of removing the moisture extracted from the drying material during drying. Furthermore, at least one circulation fan is present within the drying device for a circulation of the gaseous dry medium heated via the heating register. Flow grids within the drying device preferably allow directed and uniform contact of the drying medium circulated via the fans with the drying material. Due to the large number of independent components mentioned le the known drying devices are also complex and therefore expensive to manufacture.
- the object of the invention is to further improve the known drying devices in such a way that, with the same size, an increased usable volume is available for the sawn timber, while at the same time reducing the manufacturing and consequently the cost of such dryers.
- a corresponding object is achieved by a drying device with the features of claim 1.
- the heating device is at least partially an integral part of the support structure according to the characterizing part of claim 1
- independent heating registers within the drying device can be dispensed with, since the support structure is now used simultaneously as the heating device. Since the heating registers can therefore be dispensed with and the amount of material required for the support function does not have to be increased further by introducing the heating function, the economy of the drying device according to the invention can be significantly increased - also because of additional labor cost savings.
- the integration of the heating device within the support structure of the drying chamber results in an improved heating effect, since the heating device can then be arranged centrally in the drying chamber and allows a better distribution of the amount of heat within the sawn timber to be dried, which is energy-efficient overall. There is also an additional saving in energy for the circulation fans since the pressure loss when the combination of support structure and heating flows through is reduced compared to the flow through several separate units.
- Another embodiment uses a special profile in the support structure, preferably the bottom wall, by means of which this is supported on the structure described above.
- This special support profile can also be heated, but at the same time it is designed as a trough into which the moisture from the dry material after condensation, e.g. in free slopes, led in or fresh water is supplied. If necessary, this support trough can be heated in a targeted manner, and thus perform an evaporator function to influence the drying climate. Removing the condensate can e.g. by pumping out.
- This special support profile in the form of a tub with heating thus advantageously combines, in addition to the support and heating function, the tasks of a customary, separate, internal or external evaporator and a separate condensate collection container as it is known in the art.
- the support structure according to the invention with an integrated heating device is used in particular on internal support structures of vacuum drying chambers. However, it is also possible to combine the support structure of external walls with a heating function in this way.
- the support structure likewise forms a framework with individual stiffening bars, which are designed as hollow bars and are used to transport a heating medium.
- heated fluid such as water or oil, can serve as the heating medium or the heating device can be operated by means of hot steam.
- the support structure can also be used in whole or in part as an electrical heating element / rods.
- the hollow bars are formed from longitudinal and transverse bars, the longitudinal bars preferably absorbing the load of the respectively assigned chamber wall.
- a uniform load distribution within the support structure can thus be achieved.
- the forces involved in vacuum drying are enormous. With a negative pressure of, for example, 900 mbar within the vacuum dryer, loads of approx. 90,000 N are applied to every square meter of the dryer housing, which corresponds to a weight of approx. 9 t. For the relatively thin chamber walls, this represents an enormously high load.
- the respective longitudinal bars are connected to the transverse bars connected to them in a fluid-carrying manner.
- the longitudinal and transverse bars are functional groups. pen summarized, with the middle longitudinal rod between two outer longitudinal rods serving for the supply of the heating medium and the other two longitudinal rods for removal. Based on these function groups, defined heating areas can be defined within the heatable supporting wall, so that depending on the intended use, drying can also take place in stages or not all heating groups within the supporting structure can be controlled for a drying process.
- the respective central longitudinal rod for supplying the two adjacent longitudinal rods of a functional group preferably has two separate fluid guides, the longitudinal rods being connected to assigned manifolds for the fluid supply and discharge.
- transverse or longitudinal bars can be specified, so that it is possible to build supporting wall structures that are heatable, predominantly via transverse or predominantly longitudinal bars.
- the longitudinal bars are preferably of modular construction in predeterminable lengths, so that with a standard size of support struts the framework support structure can essentially be constructed.
- 1 shows an end sectional view of a known drying device
- 2 shows a side view of a drying device according to the
- Fig.1 used support structure
- FIG. 3 shows a representation of the dryer according to the invention corresponding to FIG. 1;
- FIGS. 4 and 5 shows a partial section of the support structure according to FIGS. 4 and 5.
- the drying device according to FIG. 1 is used to dry sawn timber, which can be brought into packages 10 from the outside, in particular from the front side of the drying device.
- the drying device has a drying chamber 12 which can be heated by means of a heating device designated as a whole as 14.
- the drying chamber 12 mentioned is surrounded by chamber walls 16, specifically by two side chamber walls 18, a ceiling chamber wall 20 and a bottom chamber wall 22.
- the drying chamber 12 closes to the rear with a drying chamber wall 24 on the front, as viewed in FIG.
- the front, opposite, drying chamber wall is not shown.
- At least one of the two end drying chamber walls must be able to be opened or closed completely or partially in the manner of chamber doors to be able to bring in and take out the packages 10 of lumber to be dried from the drying device.
- the chamber walls 1 8, 20, 22, 24 mentioned are standardized components and can be put together in predeterminable assemblies in order to be able to put together such different sizes of drying devices in the sense of a modular construction kit.
- a support structure 26 in the manner of a truss 28 extends within the drying chamber 12 in a vertical plane between the ceiling chamber wall 20 and the bottom chamber wall 22, as is shown in more detail in FIG.
- the known support structure 26 in the form of the truss 28 also extends between the two front dry walls 24.
- the known truss 28 consists of individual stiffening bars 30, which are composed of longitudinal bars 32 and transverse bars 34, whereby a further stiffening is achieved via cross struts 36.
- the inside of the ceiling chamber wall 20 and the bottom chamber wall 22 are supported on the free ends of the longitudinal rods 32.
- the application of force is shown with arrows.
- a vacuum device connected to the drying device, designated as a whole by 38, with a vacuum pump 40 applies a vacuum in the drying chamber 12 during operation of the drying device, the vacuum generated in the drying chamber 12 in the Usually is at least 500 mbar.
- the negative pressure generated in this way in the drying device allows the chamber walls 16 to bulge inwards in the direction of the drying chamber 12 stiffening for the relevant chamber walls 20, 22 takes place.
- Ventilation devices such as fan flaps or valves, which are arranged on the dryer housing and are not shown in any more detail, can also be used to supply this with fresh air.
- the drying device has a removal option 42 for the moisture to be extracted during the drying process. In this way, the water formed during drying can be removed from the dryer.
- the structure described above is basically known, so that it will not be discussed in more detail here.
- heating device 14 with two vertical rows of individual heating registers 44 arranged one above the other.
- These heating registers 44 can take up a relatively large amount of installation space within the drying chamber 1 2, which is then no longer required for the storage of
- Lumber batches 10 are available so that the amount of lumber to be dried is reduced in the known solution.
- the heating registers 44 in question are connected to a central heat source which supplies the heating register 44 with heated fluid, such as water or oil, or with gaseous steam for the drying process.
- at least one electrically operated circulation fan 46 is arranged between the support structure 26, which forms a kind of partition, and the stored sawn timber batches 10, the fan blades of which are each facing the sawn timber batches 10.
- the respective fan 46 is connected to the framework support structure 26, 28 and is thus held within the drying chamber 12.
- the fans 46 in question can be arranged at various locations within the drying device.
- a flow grille 48 is arranged between the respective fan 46 and the sawn timber batch 10.
- the relevant structure is also known, so that it will not be discussed in more detail here.
- the drying device according to the invention differs essentially from the previous drying device according to the prior art in that the central support structure 26 is constructed as a framework and integrates the heating device designated as a whole with 14, ie the previous heating registers 44 are basically an integral part of the framework Support structure 26.28.
- the stiffening rods 30 now serve to transport the heating medium itself.
- the stiffening bars 30, which are designed as hollow bars, can be produced inexpensively from a metal I material or the like and can be provided in predefinable lengths depending on the size of the drying device. According to the representations according to FIGS.
- the stiffening bars 30 designed as hollow bars are this time only composed of longitudinal bars 32 and cross bars 34 in the manner of a hollow chamber profile and the known further cross struts or cross struts 36 are basically avoided. However, it is entirely possible, should this become necessary and, as is shown in FIG. 5, to use such additional cross struts 36. In this case, they can be designed as hollow-chamber profiles, also serve to transport the heating medium or, in the sense of a further truss structure, serve to stiffen the support structure 26. In the support structure 26 according to the invention with an integrated heating device 14, the longitudinal rods 32 preferably also take up the load of the respectively assigned chamber wall 20, 22, the load entry direction again being indicated by arrows.
- the ceiling chamber wall 20 and possibly also the bottom chamber wall 22 therefore rest against the free ends of the longitudinal bars 32 and, when the drying device is in operation with a vacuum applied via the vacuum device 38, the chamber wall sheets bulge and are supported on the free ends of the longitudinal bars 32.
- the end-side drying chamber walls 24 in turn are supported in this example on the vertically running outer longitudinal bars 32.
- the respective longitudinal rods 32 are connected in a fluid-carrying manner to the transverse rods 34 which are directly connected to them.
- Fig. 6 gives a NEN excerpt related to the conditions and the rod guide as shown in Figure 4.
- the direction of fluid flow of the heating medium is indicated in principle by arrows in FIG. 6.
- the respective longitudinal rods 52, 54 are separated from one another in a fluid-tight manner in their central plane by a partition 56.
- a partition 56 instead of pulling in a partition 56, there is also the possibility here of forming the longitudinal bars 52, 54 from standard lengths of hollow longitudinal bars 32 and joining them together in groups to form a load-bearing bar.
- the cross bars 34 which can have different lengths, can also be assembled modularly for a drying device.
- the transition points of transverse and longitudinal bars 32, 34 can preferably be obtained in a fluid-tight manner via welding points.
- the respective middle longitudinal rod 52 for supplying the two adjacent outer longitudinal rods 54 has two separate fluid guides 58 to which the adjacent transverse rods 34 are connected.
- these are connected in the region of their end-to-end termination to a collective supply and discharge line (not shown in more detail), wherein several of these collective lines can control the functional groups 50.
- a kind of fine tuning of the drying process can be achieved via the integrated heating device 14 without the free ends of the longitudinal bars 32 being impaired in their load-bearing capacity by the collecting lines.
- the vertical longitudinal bars 32 take on the additional support Function as a collecting pipe for the inflow or outflow of the heating medium according to the principle shown in FIG. 6 for the cross bars 34.
- the horizontal transverse bars 34 act as supports for the necessary collecting pipe function for the closing - and discharge of the heating medium.
- the support takes place via the vertically arranged longitudinal bars 32, which, however, are divided in the central region between the two outer longitudinal bars 32 and do not run continuously from top to bottom as a supporting component.
- the middle outer longitudinal rods 32 open into a common transverse rod 34, the plurality of longitudinal rods 32 being divided into two functional groups 50 within the horizontally extending transverse rods 34, in addition to the support, essentially also taking over the heating.
- the longitudinal bars 32 arranged vertically at the bottom and at the top therefore serve only as force introduction struts and the actual main load is later released via the middle lattice structure of cross struts 34 and longitudinal bars 32 into the lower support structure with the longitudinal bars 32 at the bottom chamber wall 22.
- the corresponding force application points are again indicated by arrows.
- the number of longitudinal bars 32 for a support structure in the sense of a chamber wall is increased in relation to the transverse bars 34, whereas in the embodiment according to FIGS. 4 and 6 the transverse bars 34 predominate over the longitudinal bars 32, which here are continuously trained.
- the heating fluid is essentially carried out continuously in closed circuits.
- FIG. 2 it would be conceivable to add a classic truss structure as shown in FIG. 2 with a fluid-carrying truss structure as shown in FIGS. 4 to 6 connect and only perform the heating at specified positions.
- the support structure with integrated heating As a flow grille.
- the flow grilles 48 can be omitted in the prior art and the flow guidance is realized via the support structure 26 with its framework 28. This also increases the possible storage space for the sawn timber stacks 10 within the subspaces of the drying chamber 12. A combination of heating device 14, support structure 26 and flow air flow within the drying device is thus achieved with one structural unit.
- the drying device according to the invention can be used for dryers with round, square, polygonal or other cross sections. Drying is carried out by circulating the dry medium in the negative pressure by means of the fans 46. The dry medium and ultimately the dry material absorbs heat from the heating device 14 of the central support structure 26 by convection. The framework 28, which then forms a flow grille, furthermore ensures an improved distribution of the heated drying medium over the material to be dried, in order to be able to remove moisture evenly therefrom. If the temperature falls below the dew point, the previously absorbed moisture is extracted from the gaseous dry medium by means of condensation. This process continues until the desired final moisture content is reached in the dry material, the process in question being able to be monitored by a control and monitoring device (not shown in detail).
- the tubes and profiles used for the support structure 26 can have different shapes and consist of different materials or combinations of materials.
- the size dimensions can also be varied.
- the use of the manifolds and manifolds for connection to supply and return lines for the heating medium can vary.
- the stiffening rods 30 serving as heating pipes can be designed, for example, ribbed but also smooth for improved heat emission.
- the integration of the heating register within the support structure 26 results in such a favorable application in the statically stressed vacuum dryer that material, wage and space savings are achieved.
- the also achievable large pipe surface area via the statically necessary amount of stiffening rods 30 has the result that additional ribs for the heat exchange in the rough vacuum are not necessary. This in turn establishes a flow grid function in which fins could otherwise narrow the space between parallel tubes too much.
- the drying device can have a plurality of partial spaces for the sawn timber packages 10, in which case these are preferably separated between two adjacent partial chamber spaces as a supporting structure 26 via a truss wall.
- a supporting structure 26 via a truss wall.
- All longitudinal rods 32 are preferably oriented vertically when the drying device is set up and the transverse rods 34 are horizontal. Sloping arrangements are also possible here.
- the longitudinal bars can basically serve as heating pipes and the cross bars as collecting tube. The arrangement in question can also be reversed, with different connection variants for the supply and discharge of the heating medium being possible.
- the drying device according to the invention is characterized in particular in that a combination of heating registers, support structure and, if appropriate, flow grids is realized in one structural unit.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50103847T DE50103847D1 (en) | 2000-02-12 | 2001-01-27 | DRYING DEVICE WITH VACUUM OPERATION, ESPECIALLY FOR WOOD |
EP01915171A EP1190202B1 (en) | 2000-02-12 | 2001-01-27 | Vacuum-operated drying device, especially for sawn timber |
AT01915171T ATE278170T1 (en) | 2000-02-12 | 2001-01-27 | DRYING DEVICE WITH VACUUM OPERATION, ESPECIALLY FOR CUT WOOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10006307A DE10006307A1 (en) | 2000-02-12 | 2000-02-12 | Vacuum-operated dryer, especially for sawn timber, has heater at least partly integral with lattice supporting structure with stiffening rods carrying heating medium |
DE10006307.1 | 2000-02-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001059378A2 true WO2001059378A2 (en) | 2001-08-16 |
WO2001059378A3 WO2001059378A3 (en) | 2002-01-17 |
Family
ID=7630722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/000893 WO2001059378A2 (en) | 2000-02-12 | 2001-01-27 | Vacuum-operated drying device, especially for sawn timber |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1190202B1 (en) |
AT (1) | ATE278170T1 (en) |
DE (2) | DE10006307A1 (en) |
WO (1) | WO2001059378A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7963048B2 (en) * | 2005-05-23 | 2011-06-21 | Pollard Levi A | Dual path kiln |
US8201501B2 (en) | 2009-09-04 | 2012-06-19 | Tinsley Douglas M | Dual path kiln improvement |
US10619921B2 (en) | 2018-01-29 | 2020-04-14 | Norev Dpk, Llc | Dual path kiln and method of operating a dual path kiln to continuously dry lumber |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8788070B2 (en) * | 2006-09-26 | 2014-07-22 | Rosemount Inc. | Automatic field device service adviser |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE165161C (en) * | 1904-04-25 | |||
FR929704A (en) * | 1946-06-24 | 1948-01-06 | Fours Gohin | Industrial dryer in prefabricated elements |
US3566480A (en) * | 1967-05-01 | 1971-03-02 | Frederick Noel Hope Johnstone | Kilns |
US4136463A (en) * | 1976-12-06 | 1979-01-30 | Damon P. Nolan | Radiant heat paint spray chamber |
US4194296A (en) * | 1977-05-17 | 1980-03-25 | Pagnozzi Ernesto Guglielmo | Vacuum drying kiln |
DE3715511A1 (en) * | 1986-05-13 | 1987-11-19 | Josef Wild | Wood drying chamber using compression and suction |
DE4215385A1 (en) * | 1992-05-11 | 1993-11-18 | Ibk Industriebedarf Gmbh | Vacuum drying cupboard with heat flow passages in roof, floor and walls - shows min. risk of explosion and drying time for laboratory preparations |
US5421246A (en) * | 1994-03-22 | 1995-06-06 | Tippmann; Joseph R. | Enclosure having a rack for heating or cooling food products |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3330394A1 (en) * | 1983-07-29 | 1985-02-14 | Josef Gartner & Co, 8883 Gundelfingen | DEVICE FOR TEMPERATURE SPACES OF A BUILDING |
DE8660018U1 (en) * | 1986-03-01 | 1987-02-26 | Timmer Ingbuero Gmbh | |
DE29711229U1 (en) * | 1997-06-27 | 1997-09-04 | Gloetzer Glasbau Gmbh | facade |
-
2000
- 2000-02-12 DE DE10006307A patent/DE10006307A1/en not_active Withdrawn
-
2001
- 2001-01-27 DE DE50103847T patent/DE50103847D1/en not_active Expired - Fee Related
- 2001-01-27 EP EP01915171A patent/EP1190202B1/en not_active Expired - Lifetime
- 2001-01-27 WO PCT/EP2001/000893 patent/WO2001059378A2/en active IP Right Grant
- 2001-01-27 AT AT01915171T patent/ATE278170T1/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE165161C (en) * | 1904-04-25 | |||
FR929704A (en) * | 1946-06-24 | 1948-01-06 | Fours Gohin | Industrial dryer in prefabricated elements |
US3566480A (en) * | 1967-05-01 | 1971-03-02 | Frederick Noel Hope Johnstone | Kilns |
US4136463A (en) * | 1976-12-06 | 1979-01-30 | Damon P. Nolan | Radiant heat paint spray chamber |
US4194296A (en) * | 1977-05-17 | 1980-03-25 | Pagnozzi Ernesto Guglielmo | Vacuum drying kiln |
DE3715511A1 (en) * | 1986-05-13 | 1987-11-19 | Josef Wild | Wood drying chamber using compression and suction |
DE4215385A1 (en) * | 1992-05-11 | 1993-11-18 | Ibk Industriebedarf Gmbh | Vacuum drying cupboard with heat flow passages in roof, floor and walls - shows min. risk of explosion and drying time for laboratory preparations |
US5421246A (en) * | 1994-03-22 | 1995-06-06 | Tippmann; Joseph R. | Enclosure having a rack for heating or cooling food products |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7963048B2 (en) * | 2005-05-23 | 2011-06-21 | Pollard Levi A | Dual path kiln |
US8201501B2 (en) | 2009-09-04 | 2012-06-19 | Tinsley Douglas M | Dual path kiln improvement |
US8342102B2 (en) | 2009-09-04 | 2013-01-01 | Douglas M Tinsley | Dual path kiln improvement |
US10619921B2 (en) | 2018-01-29 | 2020-04-14 | Norev Dpk, Llc | Dual path kiln and method of operating a dual path kiln to continuously dry lumber |
Also Published As
Publication number | Publication date |
---|---|
DE10006307A1 (en) | 2001-08-23 |
WO2001059378A3 (en) | 2002-01-17 |
EP1190202B1 (en) | 2004-09-29 |
DE50103847D1 (en) | 2004-11-04 |
ATE278170T1 (en) | 2004-10-15 |
EP1190202A2 (en) | 2002-03-27 |
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