EP0834048B1 - Verfahren und vorrichtung zum trocknen von schnittholz bei unterdruck - Google Patents
Verfahren und vorrichtung zum trocknen von schnittholz bei unterdruck Download PDFInfo
- Publication number
- EP0834048B1 EP0834048B1 EP96917353A EP96917353A EP0834048B1 EP 0834048 B1 EP0834048 B1 EP 0834048B1 EP 96917353 A EP96917353 A EP 96917353A EP 96917353 A EP96917353 A EP 96917353A EP 0834048 B1 EP0834048 B1 EP 0834048B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drying
- chamber
- wood
- drying chamber
- stack
- 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.)
- Expired - Lifetime
Links
- 238000001035 drying Methods 0.000 title claims abstract description 113
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000002023 wood Substances 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims description 24
- 238000001704 evaporation Methods 0.000 claims description 22
- 230000008020 evaporation Effects 0.000 claims description 19
- 238000012546 transfer Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract 1
- 239000002274 desiccant Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 8
- 238000001291 vacuum drying Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 230000036561 sun exposure Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
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
- 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
- F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
Definitions
- the invention relates to a method and a device for drying sawn timber stacked with intermediate strips or other hygroscopic plate or rod-shaped Goods with negative pressure in a vacuum-proof drying chamber, which with fans, the direction of action transverse to Longitudinal axis of the chamber runs for the circulation of a gaseous Dry medium, with one or more heating registers, which extend over the length of the drying chamber, and with a dehumidifier (condenser) inside or outside the drying chamber, the Heat transfer from the heating register (s) to the dry medium depending on the measured values of the desiccant temperature and / or the wood temperature and / or the wood moisture and / or the wood moisture gradient is regulated.
- Such a method and one for carrying it out Process-serving device are from DE-U-92 03 725 known.
- Be in an elongated drying chamber here wagons with the wood to be dried, the Drying air is blown inside the drying chamber circulated and contained in the drying medium Moisture in a condenser separated from the drying room put down as water.
- the heat supply from a heater to the drying room depending of measured values of the desiccant temperature and / or the wood temperature and / or the wood moisture and or the Wood moisture gradients set.
- Vacuum drying in a rough vacuum offers in comparison for conventional technical drying at atmospheric pressure the possibility of significantly reducing drying times.
- the mobility of the water inside the wood increases with it decreasing pressure, so that the drying is correspondingly faster can be done without drying out in the wood mechanical stresses on the surface when the core is wet arise (the so-called "formwork") that lead to education of cracks or deformations.
- a shortening of the drying time presupposes that the required one Evaporation heat correspondingly faster from the heating register is transferred to the wood. This is in a vacuum with convective heat transfer not easy to achieve because the heat capacity of the drying medium, the carrier of thermal energy, reduced in proportion to the decreasing pressure. It must therefore be compared to conventional Drying significantly higher flow rates of the Dry media are generated to provide enough energy per unit of time to be able to transport.
- the regulation of the steam pressure or steam partial pressure takes place in the vacuum drying chamber usually by means of the cooling capacity of the capacitor. Increased cooling reduces the Vapor pressure through condensation; Pressure increase results in switched off cooling by the from the wood in the form of Steam coming moisture. In critical situations when the Steam release from the wood is less than the condensation the not completely heat-insulated outer chamber wall, or when the heat supply to the wood is stopped for other reasons must be, it may be necessary to increase the pressure to generate additional steam.
- the invention avoids the disadvantages of the prior art. It is the object of the invention to supply heat individual stacking areas and thus the moisture release of the Timber per unit of time in these areas regardless of other areas of the same drying batch in one and to regulate the same drying chamber. This is supposed to be achieved that there are wood moisture differences between the stacking areas even during the drying phase before reaching it balance the final conditioning phase, and that the emergence of additional wood moisture differences inhomogeneous heat losses on the outer walls of the chamber or through inhomogeneous heat supply is prevented as far as possible.
- the invention solves the problem by the features according to the method of claim 1.
- An additional Division into at least two stacking areas into different ones Heights can be particularly advantageous for high overall stacks. In chambers with great height and short length alone can be a height division be enough.
- a relative measure of what is transferred to individual stack areas The amount of heat can be from the temperature readings of the Desiccant before stack entry and after stack exit be won.
- the pressure in the drying chamber among other parameters the mobility of moisture in the wood can also be determined not vary locally, nor the partial pressures the existing gases or vapors. But it was possible for others Find parameters that are different Stacking areas of a batch in one and the same drying chamber individually treated so that despite different initial moisture levels are largely the same Final moisture of the stack is achieved, or that influences the drying rate due to thermal bridges or inhomogeneous distributed heat input or external influences avoided become.
- the desired division into stack areas can be according to the invention through a device achieve with the features of claim 8.
- a further development of the device for achieving a division into Stacking areas is that individual fans or Groups of neighboring fans are operated separately, by using each fan or fan group a control device independent of the other fans arbitrarily switched on and off over time can be. Individual speed control can also be used apply when the increased investment costs through additional frequency converters can be accepted.
- the invention prefers a combined device the one heating register section two or more fans are assigned, which are switched individually can be. This allows the average speed the desiccant flow to a certain extent set independently of the desiccant temperature.
- This setting or control depends on Measured values of the wood moisture and / or the wood moisture gradient (gradients) and / or the wood temperature separated by Sensors can be obtained in each stack area.
- the heat supply can be used regulate based on the measured values of the desiccant temperature.
- the invention enables Woods different Type and strength at the same time in one batch without loss of quality to dry, provided they have similar drying properties have.
- the amount of moisture released per time is in a vacuum determined by the transferred heat of vaporization as long the moisture mobility in the wood is sufficient to suffice Maintain moisture transport from the wood core.
- the resulting moisture gradient between the core and the surface must not exceed a specific limit, so that the wood is not endangered by formwork and the drying process practically comes to a standstill is coming.
- Step across the width of a drying area i.e. in Direction of flow of the desiccant, deviating wood moisture on both sides of the stack, it is possible to under Applying a different treatment a reduction to achieve the deviations in that by temporal asymmetrical fan reverse clock to the (regarding the preferred desiccant flow direction over time) transfer more heat on the inlet side of the stack is considered to be the exit side. In this case leaves one is therefore longer in one flow direction than in flow the desiccant in the opposite direction.
- each of the two directions of rotation has a different fan speed to choose.
- These measures can also be used for design-related reasons Properties of commercial fans compensate for those that are generally not identical Efficiency (delivery capacity depending on the speed) possess for both directions of rotation.
- Chamber-specific effects are made of the influences described Circumstances or external conditions due to interference with the homogeneous temperature distribution strongest at high wood moisture at the beginning of drying and when difficult to dry Noticeable wood.
- existing ones play Wood moisture differences play a minor role.
- a uniform, rapid drying progress with homogeneous Temperature distribution can be used in this phase instead of by area-specific Regulation of heat emission also through targeted Mixing the desiccant between neighboring ones Areas or throughout the chamber.
- flow directing elements or additional ones Fans suitable in the longitudinal direction of the chamber Desiccant flow, which is perpendicular to it main flow superimposed.
- the wood-related conditions gain (e.g. moisture differences, accuracy of stacking) increasingly important; a continued mixing the desiccant can then no longer solve the task contribute.
- a vacuum dryer with a device for steam generation inside or outside the chamber it is for the individual drying treatment of the individual drying areas not necessary the flow of evaporative liquid individually controllable, because steam is always even distributed across the entire chamber, regardless of what place it is created.
- the steam is generated in such a way that liquid intended for evaporation over the entire Chamber length evenly on warmer and cooler heating register sections is applied.
- the reservoir does not become complete at the end of drying emptied, thus also for the initial phase of the next Drying a stock of condensate is available.
- heating register sections in particular cooler heating register sections, not evaporated Liquid is collected and returned to the reservoir becomes. This will result in continuous, uncontrollable evaporation the excess liquid avoided, provided this would remain in the area of the desiccant flow.
- the length of the drying chamber is characterized by this from that the drying chamber, preferably in the direction of their Longitudinal axis and / or in the vertical direction in several stacking areas is divided, and that each stacking area means in Form of sensors, control and / or regulating devices for setting an individual heat supply for the are assigned to the respective stacking area.
- the device according to the invention divides the drying chamber preferably in the direction of its longitudinal axis and / or height in several stacking areas, but this division is not through more or less hermetically separating partitions is reached, but a way of pressure equalization by transferring the drying medium between the individual Stack areas is left.
- the division is rather through Controls of the fans effective in sections and / or the heating register is reached. For this in sections
- Each stacking area is controlled by means in the form of sensors, Control and / or regulating apparatus for adjustment an individual heat flow for the respective stacking area assigned.
- the heating register consists of two or consists of several sub-registers, each part of which is a separate one Valve for throttling or blocking the heating medium flow in the sub-register.
- the evaporation liquid For a dryer with an evaporation device, it is advisable to if for the evaporation liquid to be supplied to the heating registers at least one with outlet openings Pipe that extends over the length of the chamber, in is arranged close to the sub-registers and this with the evaporation liquid supplied when the vapor pressure in the chamber is to be increased.
- the pipe is for feeding of evaporation liquid via a motor pump a reservoir of the condensate originating from the wood is.
- Individual fans are preferably controlled through a central process computer.
- the vacuum-proof drying chamber shown in the drawing for drying stacked with intermediate strips Lumber at negative pressure consists of an elongated cylindrical boiler 1 on at least one end face is closed with a gate 2.
- the false ceiling 6 extends in length from one End of the drying chamber 1 to the other end, on their sides however, it does not reach the wall of the drying boiler 1 approach, but leaves so much space that an annular Flow of the drying medium around the longitudinal axis of the Boiler around is possible.
- This flow runs through the Stack 5 along the boiler wall in room 8 above the false ceiling 6 and from there again along the boiler wall into the actual drying room 9.
- the mezzanine 7 also extends from one end to the other End of the drying boiler 1 and extends to the side The boiler wall.
- the room 10 below the mezzanine However, 7 is not hermetic from the actual one Drying room 9 separated, rather the drying medium from room 9 into room 10 through the column on the side the platforms of the car 4 enter.
- the condenser is located below the intermediate floor 7 12, the room 10 itself serves as a reservoir for that on the capacitor 12 condensate obtained.
- FIGS. 1 and 2 are reversible fans 13 for circulating the gaseous Dry medium in the room 8 above the false ceiling 6 arranged, their direction of action runs transversely to the longitudinal axis of the boiler 1.
- the interior of the boiler 1 is divided into several Stacked areas A, B, C, D and E divided.
- One with sprayers provided pipe 15 extends parallel to Heating register over the length of the drying chamber.
- the fans are evenly spaced above the false ceiling. Thereby is at least a fan assigned to a drying area.
- Measuring points for the wood moisture and / or the wood moisture gradient as well as the wood temperature are provided in the stack.
- sensors for the desiccant temperature in the Drying chamber arranged on one or both sides of the stack.
- a drip pan 16 for non-evaporated evaporation liquid arranged, of which a tube 17 in the as a reservoir for evaporation liquid and condensate serving space 10 leads. From this space 10 is then again for evaporation required liquid removed and by means of a pump 18 pumped into the spray tube 15.
- the heating register 14 are in the embodiment of Fig.1 and 2 arranged in room 8 in front of the reversible fans 13.
- the heating medium is fed to them via valves 11, connected to a heating medium supply pipe 22 are.
- a sensor 20 arranged to the processor serving as a controller for to give the process management necessary values. Further Transducers, not shown, are provided for the different to obtain the measured values mentioned.
- the heating registers 14 are in the horizontal central plane of the boiler 1 is arranged.
- the Fans 13 are laterally in front of the stacks of sawn timber 5 arranged, they can also be stacked on two levels be arranged.
- 4 are the Heating register 14 laterally in front of the lumber stacks 5 in two levels one above the other. With this arrangement stacks can be divided into two height ranges. Additional Fans 23, which are not absolutely necessary if necessary, a flow component in the longitudinal direction of the chamber.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Description
- Fig.1
- einen Längschnitt durch eine Trocknungskammer,
- Fig.2
- einen Querschnitt durch diese Trocknungskammer
- Fig.3
- einen Querschnitt durch eine andere Trocknungskammer
- Fig.4
- einen Querschnitt durch eine weitere Trocknungskammer
Claims (14)
- Verfahren zum Trocknen von mit Zwischenleisten gestapeltem Schnittholz oder anderen hygroskopischen platten- oder stabförmigen Gütern bei Unterdruck in einer vakuumfesten Trockenkammer, welche mit Ventilatoren, deren Wirkungsrichtung quer zur Längsachse der Kammer verläuft, zur Umwälzung eines gasförmigen Trockenmediums, mit einem oder mehreren Heizregistern, die sich über die Länge der Trockenkammer erstrecken, und mit einer Entfeuchtungseinrichtung (Kondensator) innerhalb oder außerhalb der Trockenkammer ausgestattet ist, wobei die Wärmeübertragung von dem/den Heizregister(n) auf das Trockenmedium in Abhängigkeit von Meßwerten der Trockenmitteltemperatur und/oder der Holztemperatur und/oder der Holzfeuchte und /oder des Holzfeuchtegradienten geregelt wird,
dadurch gekennzeichnet,daß man die Trockenkammer, vorzugsweise in Richtung ihrer horizontalen Längsachse und/oder in Höhenrichtung, in zwei oder mehrere Stapelbereiche entsprechend dem individuellen Wärmebedarf teilt,daß man einzelnen Stapelbereichen eigene Heizregister oder Heizregisterteile zuordnet,und daß man die Wärmezufuhr an jeden Stapelbereich gesondert regelt. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Wärmezufuhr für einzelne Stapelbereiche durch die Heizleistung der zugeordneten Heizregister oder Heizregisterteile eingestellt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Wärmezufuhr für einzelne Stapelbereiche durch die Drehzahl und/oder die Lauf- und Pausendauer und oder die Anzahl der im Betrieb befindlichen, räumlich zugeordneten Ventilatoren eingestellt wird. - Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß durch zeitlich unsymmetrischen Ventilator-Reversiertakt und/oder durch drehrichtungsabhängige Drehzahlan die (bezüglich der im Zeitmittel bevorzugten Trockenmittelströmungsrichtung) eintrittsseitige Stapelhälfte mehr Wärme übertragen wird als an die austrittsseitige. - Verfahren nach Anspruch 1, zur Durchführung in einem Vakuumtrockner mit Verdampfungseinrichtung,
dadurch gekennzeichnet,
daß zur Verdampfung bestimmte Flüssigkeit über die gesamte Kammerlänge gleichmäßig auf wärmere und kühlere Heizregisterabschnitte aufgebracht wird. - Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
daß die zur Verdampfung benötigte Flüssigkeit einem Reservoir des aus dem Holz stammenden Kondensats entnommen wird. - Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
daß die an Heizregisterabschnitten, insbesondere kühleren Heizregisterabschnitten, nicht verdampfte Flüssigkeit aufgefangen und in das Reservoir zurückgeleitet wird. - Vorrichtung zum Trocknen von mit Zwischenleisten gestapeltem Schnittholz oder anderen hygroskopischen platten- oder stabförmigen Gütern bei Unterdruck in einer vakuumfesten Trockenkammer (1), welche mit Ventilatoren (13) zur Umwälzung eines gasförmigen Trockenmediums, deren Wirkungsrichtung quer zur Längsachse der Kammer verläuft, mit einer Entfeuchtungseinrichtung (12) (Kondensator), mit einer Verdampfungseinrichtung und mit einem oder mehreren Heizregistern (14) ausgestattet ist, die sich über die gesamte Länge der Trockenkammer erstrecken,
dadurch gekennzeichnet,daß die Trockenkammer (1), vorzugsweise in Richtung ihrer Längsachse und /oder in Höhenrichtung in mehrere Stapelbereiche (A,B,C,D,E) geteilt ist,daß dabei eine Möglichkeit des überganges des Trockenmediums zwischen den einzelnen Stapelbereichen (A,B,C,D,E) belassen ist,und daß jedem Stapelbereich (A,B,C,D,E) Mittel in Form von Meßwertgebern, Steuerungs- und/oder Regelapparaturen zur Einstellung einer individuellen Wärmezufuhr für den jeweiligen Stapelbereich (A,B, C,D,E) zugeordnet sind. - Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß das Heizregister (14) aus zwei oder mehreren Teilregistern besteht, von denen jeder Teil ein separates Ventil (11) zur Drosselung oder Sperrung des Heizmedium-Flusses in das Teilregister aufweist. - Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,daß jedem Stapelbereich (A,B,C,D) mindestens ein Ventilator (13) zugeordnet istund daß mittels einer geeigneten Steuer- oder Regelvorrichtung jederzeit die Einstellung des gewünschten Betriebszustandes der einem Trocknungsbereich zugeordneten Ventilatoren ermöglicht wird, unabhängig von den Betriebszuständen der Ventilatoren in anderen Bereichen. - Vorrichtung nach Anspruch 8, ausgeführt als Vakuumtrockner mit Verdampfungseinrichtung,
dadurch gekennzeichnet,
daß für die den Heizregistern (14) zuzuführende Verdampfungsflüssigkeit mindestens ein mit Austrittsöffnungen versehenes Rohr (15), vorzugsweise ein mit Sprühdüsen oder Bohrungen bestücktes Rohr, das sich über die Kammerlänge erstreckt, in der Nähe von Teilregistern angeordnet ist. - Vorrichtung nach Anspruch 11,
dadurch gekennzeichnet,
daß das Rohr (15) für die Zuführung von Verdampfungsflüssigkeit über eine Motorpumpe (18) mit einem Reservoir (10) des aus dem Holz stammenden Kondensats verbunden ist. - Vorrichtung nach den Ansprüchen 9 und 10,
dadurch gekennzeichnet,daß eine oben offene Auffangwanne (16) unterhalb des von Verdampfungsflüssigkeit besprühten Heizregisters (14) angebracht ist,und daß diese Wanne (16) an einem Ende eine Öffnung aufweist, durch welche überschüssige Flüssigkeit in das Reservoir (10) zurückfließen kann. - Vorrichtung nach den Ansprüchen 8 bis 10,
dadurch gekennzeichnet,
daß mindestens ein zusätzlicher Ventilator 23, dessen Wirkungsrichtung sich in Längsrichtung der Trockenkammer erstreckt, seitlich neben dem Stapel (5) angeordnet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19522028 | 1995-06-17 | ||
DE19522028A DE19522028C2 (de) | 1995-06-17 | 1995-06-17 | Verfahren und eine Vorrichtung zum Trocknen von Schnittholz bei Unterdruck |
PCT/DE1996/001066 WO1997000412A1 (de) | 1995-06-17 | 1996-06-10 | Verfahren und vorrichtung zum trocknen von schnittholz bei unterdruck |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0834048A1 EP0834048A1 (de) | 1998-04-08 |
EP0834048B1 true EP0834048B1 (de) | 1999-09-29 |
Family
ID=7764585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96917353A Expired - Lifetime EP0834048B1 (de) | 1995-06-17 | 1996-06-10 | Verfahren und vorrichtung zum trocknen von schnittholz bei unterdruck |
Country Status (7)
Country | Link |
---|---|
US (1) | US5979074A (de) |
EP (1) | EP0834048B1 (de) |
AT (1) | ATE185191T1 (de) |
CA (1) | CA2224819A1 (de) |
DE (2) | DE19522028C2 (de) |
ES (1) | ES2140101T3 (de) |
WO (1) | WO1997000412A1 (de) |
Families Citing this family (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2757097B1 (fr) * | 1996-12-13 | 1999-01-29 | Bci | Dispositif et procede de traitement a haute temperature de materiau ligno-cellulosique |
DE19801162C1 (de) * | 1998-01-15 | 1999-09-23 | Reinhard Brunner | Vorrichtung zum Trocknen von gestapeltem Schnittholz |
NL1015161C2 (nl) * | 2000-05-11 | 2001-11-13 | Npc Ind B V I O | Werkwijze voor het vervaardigen van duurzame producten. |
US6397488B1 (en) | 2000-06-15 | 2002-06-04 | Hewlett-Packard Company | Apparatus and method for drying printing composition on a print medium |
SK2272001A3 (en) * | 2001-02-14 | 2002-12-03 | Kvetoslav Nikl | A device for dielectric-vacuum drying and colour tingeing of hard wood |
AT412741B (de) | 2001-12-10 | 2005-06-27 | Muehlboeck Kurt | Verfahren zum trocknen von gestapeltem holz |
US7100303B2 (en) * | 2002-11-20 | 2006-09-05 | Pci Industries Inc. | Apparatus and method for the heat treatment of lignocellulosic material |
WO2004070270A2 (en) * | 2003-02-04 | 2004-08-19 | Waco Construction Inc. | Kiln with process water evaporation system |
FR2870154B1 (fr) * | 2004-05-13 | 2012-12-14 | Bio 3D Applic | Procede et systeme bio-thermiques pour stabiliser des bois d'oeuvre |
US7963048B2 (en) * | 2005-05-23 | 2011-06-21 | Pollard Levi A | Dual path kiln |
US7748137B2 (en) * | 2007-07-15 | 2010-07-06 | Yin Wang | Wood-drying solar greenhouse |
US8201501B2 (en) | 2009-09-04 | 2012-06-19 | Tinsley Douglas M | Dual path kiln improvement |
US20110059412A1 (en) * | 2009-09-09 | 2011-03-10 | Thomas Robert Wiedemeier | Device and process for eradicating pests in wood |
CN102252502A (zh) * | 2011-04-27 | 2011-11-23 | 于玺泽 | 木材干燥方法及干燥装置 |
US20130081300A1 (en) * | 2011-09-30 | 2013-04-04 | Donald J. Gray | Vacuum cycling drying |
CA2757608A1 (en) * | 2011-11-07 | 2013-05-07 | Guy Prud'homme | Apparatus and method for thermo-transformation of wood |
DE102012111892B4 (de) * | 2012-12-06 | 2016-04-28 | Christoph Grabolle | Vorrichtung zum Trocknen von Holz |
US10782069B2 (en) | 2014-06-10 | 2020-09-22 | Ctb, Inc. | Equilibrium moisture grain drying with heater and variable speed fan |
US9726429B1 (en) * | 2016-01-31 | 2017-08-08 | EPCON Industrial Systems, LP | Wood processing oven and method |
RU2682471C2 (ru) * | 2017-07-11 | 2019-03-19 | Владимир Петрович Голицын | Способ сушки древесины и устройство для его осуществления |
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 |
US11624557B2 (en) | 2018-07-02 | 2023-04-11 | Green Mountain Mechanical Design, Inc. | Vacuum drying kilns and control systems therefore |
CN108955112B (zh) * | 2018-07-09 | 2020-08-18 | 内蒙古农业大学 | 模块组合型木材干燥器 |
US11439044B1 (en) | 2018-12-31 | 2022-09-06 | United Services Automobile Association (Usaa) | Heat recovery from data center cooling system |
US11619444B2 (en) * | 2021-01-06 | 2023-04-04 | Boldesign Inc. | Lumber drying kiln including bidirectional push-pull air circulation |
CN113865290B (zh) * | 2021-12-02 | 2022-02-25 | 诸城市松源木业有限责任公司 | 一种原木干燥设备 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2085634A (en) * | 1932-04-15 | 1937-06-29 | Moore Dry Kiln Co | Dry kiln |
US2202143A (en) * | 1935-06-03 | 1940-05-28 | Cobb James Forrest | Dry kiln and in the art of kiln drying |
US3744144A (en) * | 1971-04-23 | 1973-07-10 | H Weis | Automated controls for lumber drying kiln |
IT1071276B (it) * | 1976-05-12 | 1985-04-02 | Pagnozzi Ernesto Guglielmo | Perfezionamenti nei procedimenti e negli impianti di essiccazione del legname..particolarmente negli impianti che impiegano il vuoto |
JPS53103261A (en) * | 1977-02-19 | 1978-09-08 | Kitagawa Iron Works Co | Method of drying wooden products and apparatus therefor |
IT1083106B (it) * | 1977-05-17 | 1985-05-21 | Pagnozzi Vincenzo | Essicatoio a vuoto particolarmente per legname |
DE3717659A1 (de) * | 1987-05-26 | 1988-12-15 | Brunner R Messtechmik | Verfahren und vorrichtung zum trocknen von schnittholz |
US5197201A (en) * | 1988-09-27 | 1993-03-30 | Ekono Oy | Process for drying timber |
DE9005827U1 (de) * | 1990-05-22 | 1990-08-23 | Kronseder, Josef, 8313 Vilsbiburg | Vorrichtung zum Trocknen von Holz |
EP0505586B1 (de) * | 1991-03-23 | 1995-11-02 | Reinhard Dipl.-Ing. Brunner | Vorrichtung zum Trocknen von Holz |
DE4228698C2 (de) * | 1991-12-02 | 1994-07-07 | Neumann Rodolfo J | Vorrichtung und Verfahren zur Kondensationstrocknung |
DE4234683A1 (de) * | 1992-10-14 | 1994-04-21 | Brunner Reinhard | Vorrichtung zum Trocknen von Holz oder anderen Feststoffen |
DE9412767U1 (de) * | 1994-08-08 | 1994-10-27 | Opel, Alfred, Dipl.-Ing. (FH), 72669 Unterensingen | Vakuumtrockner für Schnitthölzer |
-
1995
- 1995-06-17 DE DE19522028A patent/DE19522028C2/de not_active Expired - Fee Related
-
1996
- 1996-06-10 AT AT96917353T patent/ATE185191T1/de not_active IP Right Cessation
- 1996-06-10 WO PCT/DE1996/001066 patent/WO1997000412A1/de active IP Right Grant
- 1996-06-10 US US08/973,909 patent/US5979074A/en not_active Expired - Fee Related
- 1996-06-10 EP EP96917353A patent/EP0834048B1/de not_active Expired - Lifetime
- 1996-06-10 CA CA002224819A patent/CA2224819A1/en not_active Abandoned
- 1996-06-10 DE DE59603228T patent/DE59603228D1/de not_active Expired - Fee Related
- 1996-06-10 ES ES96917353T patent/ES2140101T3/es not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59603228D1 (de) | 1999-11-04 |
EP0834048A1 (de) | 1998-04-08 |
ATE185191T1 (de) | 1999-10-15 |
DE19522028C2 (de) | 1999-12-16 |
WO1997000412A1 (de) | 1997-01-03 |
DE19522028A1 (de) | 1996-12-19 |
CA2224819A1 (en) | 1997-01-03 |
US5979074A (en) | 1999-11-09 |
ES2140101T3 (es) | 2000-02-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0834048B1 (de) | Verfahren und vorrichtung zum trocknen von schnittholz bei unterdruck | |
DE2806747C2 (de) | Verfahren und Vorrichtung zum Trocknen eines feuchtigkeitsaufnehmenden Materials | |
EP0167899B1 (de) | Trockenvorrichtung, insbesondere für Schnittholz | |
DE3717659A1 (de) | Verfahren und vorrichtung zum trocknen von schnittholz | |
DE4228698C2 (de) | Vorrichtung und Verfahren zur Kondensationstrocknung | |
DE1729259C3 (de) | Verfahren und Vorrichtung zum Trocknen von Holz | |
DE69616076T2 (de) | Verfahren zur holztrocknung | |
DE1729411C3 (de) | Verfahren zum Trocknen von gegen trockene Luft empfindlichen Gütern durch ein gasförmiges, erwärmtes Trocknungsmittel in einer Kammer | |
DE3446642A1 (de) | Trocken- und konditioniereinrichtung fuer tabak | |
EP0142071B1 (de) | Verfahren zum Trocknen von Schnittholz | |
DE69810955T2 (de) | Trocknungsvorrichtung | |
AT412741B (de) | Verfahren zum trocknen von gestapeltem holz | |
AT401429B (de) | Vorrichtung zum trocknen von holz | |
DE2902369A1 (de) | Einrichtung zum entfeuchten und temperieren der in einer trocknungskammer fuer die holztrocknung bewegten kammerluft | |
DE2444034C3 (de) | Satztrockner für Getreide | |
DE3629398A1 (de) | Verfahren und vorrichtung zur entfeuchtung gasfoermiger medien | |
DE1816004A1 (de) | Verfahren und Vorrichtung zum Konditionieren von Textilstoffen | |
DE69800790T2 (de) | Verfahren zur Steuerung der Gaszirkulationsmenge in einem Holztrockner | |
DE19801162C1 (de) | Vorrichtung zum Trocknen von gestapeltem Schnittholz | |
DE4428001C2 (de) | Vakuumtrockner für Schnitthölzer und Verfahren zum Trocknen von Holz | |
DE641090C (de) | Verfahren und Vorrichtung zum Trocknen von Textilgut | |
DE1692955A1 (de) | Vorrichtung zur Behandlung von pflanzlichen Stoffen,insbesondere von Tabak | |
DE686770C (de) | Anordnung zum Niederschlagen fluechtiger Stoffe | |
DE2650570A1 (de) | Trocknungsanlage mit getrennten, indirekt beheizten trockenkammern, insbesonders fuer ziegel | |
DE29611521U1 (de) | Vorrichtung zum Trocknen von Holz |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19971211 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI NL PT SE |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
17Q | First examination report despatched |
Effective date: 19990318 |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE DK ES FR GB IT LI NL PT SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19990929 Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19990929 Ref country code: GB Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19990929 |
|
REF | Corresponds to: |
Ref document number: 185191 Country of ref document: AT Date of ref document: 19991015 Kind code of ref document: T |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REF | Corresponds to: |
Ref document number: 59603228 Country of ref document: DE Date of ref document: 19991104 |
|
ITF | It: translation for a ep patent filed |
Owner name: RACHELI & C. S.R.L. |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19991229 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 19991229 |
|
ET | Fr: translation filed | ||
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2140101 Country of ref document: ES Kind code of ref document: T3 |
|
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 19990929 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20000623 Year of fee payment: 5 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000630 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20000630 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20010629 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010630 |
|
BERE | Be: lapsed |
Owner name: BRUNNER REINHARD Effective date: 20010630 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030228 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20030605 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040611 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20040614 Year of fee payment: 9 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050610 Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050610 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20040611 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20070605 Year of fee payment: 12 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090101 |