EP1080333B1 - Device and method for vacuum-drying - Google Patents

Device and method for vacuum-drying Download PDF

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Publication number
EP1080333B1
EP1080333B1 EP00910804A EP00910804A EP1080333B1 EP 1080333 B1 EP1080333 B1 EP 1080333B1 EP 00910804 A EP00910804 A EP 00910804A EP 00910804 A EP00910804 A EP 00910804A EP 1080333 B1 EP1080333 B1 EP 1080333B1
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Prior art keywords
accordance
gas
chamber
drying
stage
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German (de)
French (fr)
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EP1080333A1 (en
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Heinz-Bernhard GRÖNINGER
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AMSONIC AG
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
    • F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
    • F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
    • F26B11/049—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis with provisions for working under increased or reduced pressure, with or without heating
    • 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
    • F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
    • 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

  • the present invention relates to a process for the vacuum drying of bulk materials.
  • the present invention relates to such a method which operates according to a self-controlling principle.
  • Drying processes are known in many variations. A technically very simple but energy-intensive process is the circulating air drying. Further drying methods are, for example, the infrared drying. Vacuum drying or ready-to-dry. Depending on the specific application, one or the other method is used in practice.
  • corrosive materials such as steel materials are dried, e.g. after a treatment or cleaning in an aqueous medium
  • the drying time should be short in order to minimize the risk of surface corrosion due to adhering water.
  • Disadvantages of the drying time in particular include complicated, twisted structures which are difficult to dry or to dry.
  • drying processes can be adversely affected by usual ambient conditions, for example, in that impurities, such as dust particles, can be introduced into the drying system, which adhere to the articles to be dried and, as a consequence, undergo world processing, eg. As a subsequent coating, or their Nationaltkelt can affect adversely.
  • impurities such as dust particles
  • US 1,902,575 generally describes a method for drying articles, wherein first in one stage, the object to be dried is heated by means of heated circulating air. In a second stage vacuum is applied for drying and then, if necessary, in a third stage, an impregnating fluid is introduced into the chamber. If necessary, the second stage can be repeated by aeration and re-application of vacuum. However, the heating of the object to be dried in the first stage without pre-drying. In addition, no program control is provided.
  • a device for the generation and maintenance of a largely free of interfering gases residual gas atmosphere in the vacuum region which contains a vacuum chamber, wherein the vacuum chamber is connected to a Adsorptionsstalle and withdrawn the residual gas from the vacuum chamber and in the circuit through the adsorption in the Chamber is returned.
  • a vacuum drying of the type described above is not provided.
  • WO 98/37371 relates to a drying process, in particular for wood, meat or similar, based on the circulation of a gas mixture including water vapor from the drying material at reduced pressure with cyclic variation of the temperature of the gas mixture.
  • the drying takes place in one or more cycles, each comprising a heating phase and cooling and drying phase.
  • the drying described here is carried out exclusively at reduced pressure, at the same time a mixture of air / nitrogen, water vapor is circulated to the drying material under cyclic temperature variation.
  • the initiation of the next cycle, as well as the determination of the number of cycles, are based on predefined measured variables.
  • US 5,263,264 describes a process for the drying of moldings, wherein immersed in a first stage of the shaped body for heating and predrying in hot water and then in a second stage vacuum drying of the heated preform is carried out with simultaneous circulation of heated air.
  • Drying of bulk materials is not provided according to this method.
  • immersion of loose bulk material in a water bath for bulk solids drying is unsuitable.
  • the implementation of the multi-stage drying process according to the invention takes place programmatically via the measurement and determination of control variables.
  • the course and the duration of the individual stages is controlled by measuring relevant control variables and comparing the measured control variables with predetermined target values.
  • an optimal and reproducible drying result for the individual drying stages can be obtained.
  • the self-control is also a completely automated drying possible.
  • the present invention is excellent for drying bulk material.
  • a container for receiving the bulk material to be dried can be provided within the vacuum chamber.
  • the container may be provided with a drive which sets the container in motion and thus also the bulk material in the container, whereby the drying is promoted.
  • the container is designed as a drum.
  • FIG. 1 shows a longitudinal section through an inventively applicable device for vacuum drying, the essential components of a chamber 1 for receiving the article or articles to be dried, a closure 1a for airtight sealing of the chamber 1, a heater 2.3, 4, 5 for introducing and Draining a gaseous substance, a gas supply line 6 and a connection 7 for a vacuum pump 9 comprises.
  • the heating device serves to generate Konvektioris terme and may preferably consist of one or more Schustrahlem.
  • the preferred device shown has two opposing radiant heaters 2, 3.
  • Other heating devices for generating convection heat are conceivable.
  • the supplied via the opening 4 gaseous material such as circulating air can be heated via a heater 4 upstream of this opening and the heat application of the or to be dried article in the chamber 1 via the externally heated gaseous substance.
  • the chamber 1 has openings 4, 5 for introducing and discharging gaseous substances, preferably air, for generating circulating air.
  • the openings are arranged so that an optimal flow through the chamber or flow around the article or articles is achieved. For example, they may be provided offset in height in opposite wall sides as in the FIG. 1 Example shown, wherein reference numeral 4 denotes the opening for introduction and reference numeral 5, the opening for discharging.
  • the supply and the discharge can be connected to each other.
  • valves 12. 13 may be provided.
  • Throttle valves 14, 15 may be provided. These devices can work regulated for self-control via measuring points.
  • the air passes through a fitness device (not shown) to remove contaminants, such as dust particles, etc., and to avoid contamination of the chamber.
  • a heating device and / or a drying device may be provided to the air prior to introduction into the chamber to heat and / or to increase its moisture content.
  • a condenser for drying the moisture-laden circulating air which leaves the chamber 1 via the opening 5, may be provided in the recirculating air line system.
  • the throttle valves 14, 15 are dispensed with.
  • the condenser is preferably in the line system on the output side.
  • circulating air drying can be used in principle any gas such as ambient air, an inert gas or mixtures thereof.
  • ambient air is used.
  • the chamber 1 is connectable to a vacuum pump 9.
  • the chamber is connected via lines 22a and 7 to the vacuum pump 9, wherein the line 22a is connected to measuring points 23 and 24 at the same time.
  • the access to the line 22a via a valve 16 is controllable, wherein the vacuum pump 9, a controllable valve 17, such as a butterfly valve, may be upstream.
  • the device which can be used according to the invention also has a gas feed line 6, via which any desired further gas, preferably an inert gas, can be fed. Via the gas supply line 6, for example, the supply of gas for the third stage can take place. As in FIG. 1 As shown, the gas supply line 6 can be connected to reservoirs 8 for various gases, so that, depending on the application, the type of gas fed in can be changed or a mixture of any desired composition can also be fed. To control the gas supply valves in the gas supply line 6 itself or in the supply lines to the individual reservoirs. Multi-way valves or the like may be provided.
  • Preferred for this purpose are so-called flow controllers, which allow a regulated gas supply.
  • an inert gas such as nitrogen or argon or mixtures thereof is added to the third stage to prevent corrosion.
  • air or oxygen, etc. can be initiated.
  • a heating device may be provided to preheat the gas and / or, if required, a drying device to promote drying.
  • the device which can be used according to the invention can be equipped, as required, with suitable further devices, e.g. with a vent 18, a cooling 19 and / or a drain line 30, e.g. Upper valves 31, 32 and 33 can be switched on.
  • suitable further devices e.g. with a vent 18, a cooling 19 and / or a drain line 30, e.g. Upper valves 31, 32 and 33 can be switched on.
  • FIG. 2 shows a section of a device as shown in FIG. 1 is shown, wherein suspended in the vacuum chamber, a container - here a drum 40 - is arranged.
  • This embodiment is particularly suitable for drying bulk material, wherein the container or the drum 40 serves to receive the bulk material.
  • the drum 40 is rotated or rotated by a drive 41, wherein bulk material therein is efficiently and quickly freed from moisture.
  • a heat treatment of the article or articles to be dried with convection heat takes place in a first stage. This is preferably done by an energy-intensive but short radiant heat supported by circulating air drying by means of the heater 2, 3 and / or an external heater for heating the circulating air before entering the chamber 1.
  • the article absorbs heat energy to counteract icing when applying vacuum , At the same time, predrying takes place by removal of a first majority of the surface moisture.
  • vacuum is applied in a second stage or the pressure in chamber 1 is reduced. A large part of the surface moisture is already removed at this time.
  • the chamber is traversed with gas to promote drying (third stage).
  • gas to promote drying (third stage).
  • an inert gas is used to simultaneously generate a protective atmosphere.
  • the vacuum or a desired pressure can be maintained via a corresponding regulation of the necessary control variables.
  • the vacuum drying process according to the invention is carried out automatically or programmatically on the basis of control variables.
  • control variables are for the individual stages, ie for the individual procedural measures such as heat.
  • Pressure reduction and gas inlet one or more suitable control variables selected and observed the course of drying in the individual stages via a determination of the actual values of the respective selected control variables and their comparison with predetermined target values and controlled.
  • the actual values of the individual control variables can be measured via measuring points or probes 23, 24, 25, which can be mounted in or connected to the chamber 1 itself, the measuring points or probes in turn being connected to control devices.
  • one or more measuring probes 25 for the moisture content of the air can be provided in the line system for the circulating air.
  • control variables and / or the duration of the individual stages can be changed so that a gletch-like optimum drying result can be achieved even for complicatedly constructed, difficult-to-dry articles.
  • control quantities or, in other words, the detection and fulfillment of all important parameters, determine the optimal termination of the respective drying step throughout the entire process. Even hard-to-reach places can be quickly and efficiently dried by this system.
  • Preferable parameters to be set are such that the drying takes place at a temperature in a range of 50 ° C to 150 ° C.
  • Preferred gases are nitrogen or argon.
  • the preferred flow rate (flow amount) can be from about 0 to 50,000 cm 3 [seagull] for a chamber volume of 1 m 3 , at a vacuum between 10 and 100 mbar.
  • the drying takes place in a closed drying system, whereby the entrainment of impurities from the environment is prevented.
  • the dried bulk material therefore meets a high purity standard.
  • the inventive method is ecological and economical.

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  • 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)

Abstract

The invention relates to a device and a method for vacuum drying, according to which, in a first step, the object to be dried is heated and pre-dried in a vacuum chamber (1), which can be closed such that it is air-tight, by means of convection heat assisted by circulating air. In a second step a vacuum is generated in the chamber and in a third step a gaseous substance is fed through said chamber. The invention notably relates to such a method for vacuum drying according to which drying can be carried out by automatic control involving the selection of suitable control quantities.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Vakuumtrocknen von Schüttgütern. Insbesondere betrifft die vorliegende Erfindung ein derartiges Verfahren, das nach einem selbststeuernden Prinzip arbeitet.The present invention relates to a process for the vacuum drying of bulk materials. In particular, the present invention relates to such a method which operates according to a self-controlling principle.

Trocknungsverfahren sind in vielen Varlanten bekannt.
Ein technisch sehr einfaches aber energieintensives Verfahren ist die Umlufttrocknung. Weitere Trocknungsverfahren sind beispielsweise die Infrarottrocknung. Vakuumtrocknung oder die Konfektionstrocknung.
Je nach konkreten Anwendungsfall wird das eine oder andere Verfahren in der Praxis eingesetzt.Drying processes are known in many variations.
A technically very simple but energy-intensive process is the circulating air drying. Further drying methods are, for example, the infrared drying. Vacuum drying or ready-to-dry.
Depending on the specific application, one or the other method is used in practice.

Problematisch bei den bekannten Verfahren sind die langen und energieintensiven Trocknungszeiten, die je nach Werkstofftyp und Beschaffenheit des zu trocknenden Gegenstandes weitere Probleme nach sich ziehen können.
Komplizierte Strukturen wie Sacktöcher, Hinterschneidungen, Lunker und Kapillaren wirken sich dabei besonders erschwerend auf die Trocknung aus.The problem with the known methods is the long and energy-intensive drying times, which can lead to further problems depending on the type of material and the nature of the object to be dried.
Complicated structures such as sack holes, undercuts, voids and capillaries have a particularly difficult drying effect.

Müssen z.B. korrosionsempfndliche Werkstoffe wie Stahlwerkstoffe getrocknet werden, z.B. nach einer Behandlung oder Reinigung in einem wässrigen Medium, sollte die Trocknungszeit kurz sein, um die Gefahr einer Oberflächenkorrosion aufgrund anhaftenden Wassers möglichst gering zu halten. Nachteilig auf die Trocknungszeit wirken sich hierbei insbesondere komplizierte verwinkelte Strukturen aus, die nur schwer trocknen bzw. zu trocknen sind.For example, corrosive materials such as steel materials are dried, e.g. after a treatment or cleaning in an aqueous medium, the drying time should be short in order to minimize the risk of surface corrosion due to adhering water. Disadvantages of the drying time in particular include complicated, twisted structures which are difficult to dry or to dry.

Es hat sich auch gezeigt, dass Trocknungsverfahren durch übliche Umgebungsbedingungen beeinträchtigt werden können, indem z.B. Verunreinigungen wie Staubpartikel in das Trocknungssystem eingetragen werden können, die an den zu trocknenden Artikeln haften bleiben und als Folge eine Welterverarbeitung z. B. eine sich anschließende Beschichtung, oder deren Gebrauchsfähigkelt nachteilig beeinflussen können.It has also been found that drying processes can be adversely affected by usual ambient conditions, for example, in that impurities, such as dust particles, can be introduced into the drying system, which adhere to the articles to be dried and, as a consequence, undergo world processing, eg. As a subsequent coating, or their Nutzertkelt can affect adversely.

Es wurde eine Reihe von Ansätzen vorgeschlagen, um die bekannten Trocknungsverfahren zur Lösung der vorstehend genannten Probleme weiterzuentwickeln.A number of approaches have been proposed to further develop the known drying methods for solving the aforementioned problems.

So wird zur Verkürzung der Trocknungszeit Vakuum angelegt, wodurch sich der Siedepunkt des am Artikel anhaftenden Lösungs- oder Reinigungsmittels erniedrigt.
Gemäß einem weiteren Lösungsansatz wird die Trocknung durch eine vorgeschaltete Konvektionswärme in einem heißen wässrigen Bad erreicht
Es Ist auch bekannt, die eigentliche Trocknung durch eine vorgeschaltete Stickstoffabblasung zu unterstützen.Thus, to reduce the drying time vacuum is applied, whereby the boiling point of the adhering to the article solvent or detergent is lowered.
According to another approach, the drying is achieved by an upstream convection heat in a hot aqueous bath
It is also known to assist the actual drying by an upstream Stickstoffabblasung.

Auch wurde vorgeschlagen, das bei der Vakuumtrocknung aufgrund des Engergieschwundes auftretende Problem der Vereisung durch eine Vorwärmung der Artikel zu beseitigen oder zumindest zu verringern.It has also been proposed to eliminate or at least reduce the problem of icing occurring in the vacuum drying due to the engergy problem due to a preheating of the articles.

US 1,902,575 beschreibt allgemein ein Verfahren zur Trocknung von Gegenständen, wobei zunächst in einer Stufe der zu trocknende Gegenstand mittels erwärmter Umluft erwärmt wird. In einer zweiten Stufe Vakuum zur Trocknung angelegt wird und dann bei Bedarf in einer dritten Stufe ein Imprägnier-Fluid in die Kammer eingeleitet wird. Bei Bedarf kann die zweite Stufe wiederholt werden durch Belüftung und erneutes Anlegen von Vakuum. Die Erwärmung des zu trocknenden Gegenstandes in der ersten Stufe erfolgt jedoch ohne Vortrocknung. Darüber hinaus ist keine Programmsteuerung vorgesehen. US 1,902,575 generally describes a method for drying articles, wherein first in one stage, the object to be dried is heated by means of heated circulating air. In a second stage vacuum is applied for drying and then, if necessary, in a third stage, an impregnating fluid is introduced into the chamber. If necessary, the second stage can be repeated by aeration and re-application of vacuum. However, the heating of the object to be dried in the first stage without pre-drying. In addition, no program control is provided.

In der EP-A-0 539 607 wird eine Vorrichtung beschrieben, wobei der zu trocknende Artikel mittels heißer Luft vorgewärmt und anschließend im Vakuum getrocknet wird. Um auch bei längeren Trocknungszeiten den Durchsatz erhöhen zu können, können mehrere Vakuumkammern parallel geschaltet sein.In the EP-A-0 539 607 a device is described, wherein the article to be dried is preheated by means of hot air and then dried in vacuo. In order to increase the throughput even with longer drying times, several vacuum chambers can be connected in parallel.

Die mit den bekannten Verfahren erzielten Ergebnisse sind jedoch für viele industrierelevante Anwendungsfälle nicht ausreichend.However, the results obtained with the known methods are not sufficient for many industrially relevant applications.

Insbesondere fehlt es an einem Verfahren, das die unterschiedlichen Probleme, die bei der Trocknung auftreten können, ganzheitlich zu lösen vermag.In particular, there is a lack of a method that can solve the various problems that can occur during drying, holistic.

In der DE 30 39 923 ist eine Vorrichtung für die Erzeugung und Aufrechterhaltung einer von störenden Gasen weitgehend freien Restgasatmosphäre im Vakuumbereich beschrieben, die eine Vakuumkammer enthält, wobei die Vakuumkammer mit einer Adsorptionstalle verbunden ist und das Restgas aus der Vakuumkammer abgezogen und Im Kreislauf über die Adsorptionsfalle in die Kammer zurückgeführt wird. Eine Vakuumtrocknung der vorbeschriebenen Art ist jedoch nicht vorgesehen.In the DE 30 39 923 a device for the generation and maintenance of a largely free of interfering gases residual gas atmosphere in the vacuum region is described, which contains a vacuum chamber, wherein the vacuum chamber is connected to a Adsorptionsstalle and withdrawn the residual gas from the vacuum chamber and in the circuit through the adsorption in the Chamber is returned. A vacuum drying of the type described above is not provided.

WO 98/37371 betrifft ein Trocknungsverfahren insbesondere für Holz, Fleisch oder Ähnlichern, das auf der Zirkulation eines Gasgemisches einschließlich von Wasserdampf aus dem Trocknungsgut bei reduziertem Druck unter zyklischer Variation der Temperatur des Gasgemisches basiert. Die Trocknung erfolgt in einem oder mehren Zyklen, die jeweils eine Heizphase sowie Kühl- und Trocknungsphase umfassen. Die hier beschriebene Trocknung erfolgt ausschließlich bei reduziertem Druck, wobei gleichzeitig ein Gemisch aus Luft / Stickstoff, Wasserdampf um das Trocknungsgut unter zyklischer Temperaturvariation zirkuliert wird. Die Einleitung des nächsten Zyklus, sowie die Bestimmung der Zyklenanzahl erfolgt anhand vorgegebener Messgrößen. WO 98/37371 relates to a drying process, in particular for wood, meat or similar, based on the circulation of a gas mixture including water vapor from the drying material at reduced pressure with cyclic variation of the temperature of the gas mixture. The drying takes place in one or more cycles, each comprising a heating phase and cooling and drying phase. The drying described here is carried out exclusively at reduced pressure, at the same time a mixture of air / nitrogen, water vapor is circulated to the drying material under cyclic temperature variation. The initiation of the next cycle, as well as the determination of the number of cycles, are based on predefined measured variables.

US 5,263,264 beschreibt ein Verfahren zur Trocknung von Formkörpern, wobei in einer ersten Stufe der Formkörper zur Erwärmung und Vortrocknung in heißes Wasser eingetaucht wird und anschließend in einer zweiten Stufe Vakuumtrocknung des erwärmten Vorkörpers unter gleichzeitiger Zirkulierung von erwärmter Luft durchgeführt wird. US 5,263,264 describes a process for the drying of moldings, wherein immersed in a first stage of the shaped body for heating and predrying in hot water and then in a second stage vacuum drying of the heated preform is carried out with simultaneous circulation of heated air.

Eine Trocknung von Schüttgütern ist gemäß diesem Verfahren nicht vorgesehen. Darüber hinaus ist zu erwarten, dass ein Eintauchen von losem Schüttgut in ein Wasserbad zur Schüttguttrocknung ungeeignet ist.Drying of bulk materials is not provided according to this method. In addition, it is expected that immersion of loose bulk material in a water bath for bulk solids drying is unsuitable.

Es ist Aufgabe der Erfindung, ein Verfahren zur Verfügung zu stellen, das neben kurzen Trocknungszeiten und geringem Energieverbrauch eine reproduzierbare und hohe Trocknungsqualltät auch bei Schüttgütern gewährleisten kann.It is an object of the invention to provide a method which, in addition to short drying times and low energy consumption, can ensure a reproducible and high drying quality even with bulk goods.

Gelöst wird diese Aufgabe durch ein mehrstufiges Verfahren zur Trocknung gemäß Anspruch 1, wobei das zu trocknende Schüttgut in einer Vakuumkammer in einer ersten Stufe mittels Konvektionswärme erwärmt und gleichzeitig vorgetrocknet wird, anschließend in einer zwelten Stufe Vakuum angelegt und in einer dritten Stufe ein gasförmiger Stoff durch die Kammer geleitet wird.This object is achieved by a multi-stage method for drying according to claim 1, wherein the bulk material to be dried is heated in a vacuum chamber in a first stage by means of convection heat and pre-dried simultaneously, then applied in a twelfth stage vacuum and in a third stage, a gaseous substance the chamber is headed.

Die Durchführung des erfindungsgemäßen mehrstufigen Trocknungsverfahrens erfolgt dabei programmgesteuert über die Messung und Bestimmung von Steuerungsgrößen.
Hierbei wird der Verlauf und die Dauer der einzelnen Stufen über die Messung von relevanten Steuerungsgrößen und Vergleich der gemessenen Steuerungsgrößen mit vorgegebenen Sollwerten gesteuert.
Durch diese Steurung kann ein optimales und reproduzierbares Trocknungs-ergebnis für die einzelnen Trocknungsstufen erhalten werden.
Ober die Selbststeuerung ist zudem eine vollkommen automatlsierte Durchführung der Trocknung möglich.The implementation of the multi-stage drying process according to the invention takes place programmatically via the measurement and determination of control variables.
In this case, the course and the duration of the individual stages is controlled by measuring relevant control variables and comparing the measured control variables with predetermined target values.
By this control, an optimal and reproducible drying result for the individual drying stages can be obtained.
The self-control is also a completely automated drying possible.

Die vorliegende Erfindung eignet sich ausgezeichnet zur Trocknung von Schüttgut. Hierfür kann innerhalb der Vakuumkammer ein Behälter zur Aufnahme des zu trocknenden Schüttgutes vorgesehen seln. Der Behälter kann mit einem Antrieb versehen sein, der den Behälter in Bewegung versetzt und damit auch das im Behälter befindliche Schüttgut, wodurch die Trocknung gefördert wird. Vorzugsweise ist der Behälter als Trommel ausgestaltet.The present invention is excellent for drying bulk material. For this purpose, a container for receiving the bulk material to be dried can be provided within the vacuum chamber. The container may be provided with a drive which sets the container in motion and thus also the bulk material in the container, whereby the drying is promoted. Preferably, the container is designed as a drum.

Nachstehend wird die Erfindung unter Bezugnahme auf eine Figur anhand einer bevorzugten Ausführungsform näher ertäutert.The invention will be explained in more detail below with reference to a figure with reference to a preferred embodiment.

Es zeigt

Figur 1
schematisch einen Längsschnitt durch eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens;
Figur 2
zeigt eine bevorzugte Ausgestaltung der Vorrichtung zur Trocknung von Schüttgut.
It shows
FIG. 1
schematically a longitudinal section through a device for carrying out the method according to the invention;
FIG. 2
shows a preferred embodiment of the apparatus for drying bulk material.

Figur 1 zeigt einen Längsschnitt durch eine erfindungsgemäß einsetzbare Vorrichtung zum Vakuumtrocknen, die als wesentliche Bestandteile eine Kammer 1 zur Aufnahme des oder der zu trocknenden Artikel, einen Verschluss 1a zum luftdichten Verschließen der Kammer 1, eine Heizvorrichtung 2,3, Öffnungen 4, 5 zum Einleiten und Ablassen eines gasförmigen Stoffes, eine Gaszuleitung 6 und einen Anschluss 7 für eine Vakuumpumpe 9 umfasst. FIG. 1 shows a longitudinal section through an inventively applicable device for vacuum drying, the essential components of a chamber 1 for receiving the article or articles to be dried, a closure 1a for airtight sealing of the chamber 1, a heater 2.3, 4, 5 for introducing and Draining a gaseous substance, a gas supply line 6 and a connection 7 for a vacuum pump 9 comprises.

Die Heizvorrichtung dient zur Erzeugung von Konvektioriswärme und kann vorzugsweise aus einem oder mehreren Heizstrahlem bestehen. Die in Figur 1 gezeigte bevorzugte Vorrichtung weist beispielsweise zwei gegenüberliegende Heizstrahler 2, 3 auf.
Auch andere Heizvorrichtungen zur Erzeugung von Konvektionswärme sind denkbar.The heating device serves to generate Konvektioriswärme and may preferably consist of one or more Heizstrahlem. In the FIG. 1 For example, the preferred device shown has two opposing radiant heaters 2, 3.
Other heating devices for generating convection heat are conceivable.

Alternativ oder auch ergänzend zu der intern in der Kammer 1 angebrachten Heizvorrichtung 2, 3 kann eine externe Heizvorrichtung vorgesehen sein. Hierbei kann der über die Öffnung 4 zugeführte gasförmige Stoff wie Umluft über eine dieser Öffnung 4 vorgeschaltete Heizvorrichtung erwärmt werden und die Wärmebeaufschlagung des oder der zu trocknenden Artikel in der Kammer 1 erfolgt über den extern erwärmten gasförmigen Stoff.Alternatively or in addition to the internally mounted in the chamber 1 heater 2, 3 may be provided an external heater. Here, the supplied via the opening 4 gaseous material such as circulating air can be heated via a heater 4 upstream of this opening and the heat application of the or to be dried article in the chamber 1 via the externally heated gaseous substance.

Die Kammer 1 weist Öffnungen 4, 5 zum Einleiten und Ablassen von gasförmigen Stoffen, vorzugsweise Luft, zur Erzeugung von Umluft auf.
Die Öffnungen sind so angebracht, dass eine optimale Durchströmung der Kammer bzw. Umströmung des oder der Artikel erzielt wird. Beispielsweise können sie höhenversetzt in gegenüberliegenden Wandseiten vorgesehen sein wie in dem in Figur 1 gezeigten Beispiel, wobei Bezugszeichen 4 die Öffnung zum Einleiten und Bezugszeichen 5 die Öffnung zum Ablassen bezeichnet.The chamber 1 has openings 4, 5 for introducing and discharging gaseous substances, preferably air, for generating circulating air.
The openings are arranged so that an optimal flow through the chamber or flow around the article or articles is achieved. For example, they may be provided offset in height in opposite wall sides as in the FIG. 1 Example shown, wherein reference numeral 4 denotes the opening for introduction and reference numeral 5, the opening for discharging.

Es können auch mehrere Zuleitungsöffnungen und/oder Ableitungsöffnungen vorgesehen sein.It is also possible to provide a plurality of supply openings and / or discharge openings.

Wie in Figur 1 gezeigt, können die Zuleitung und die Ableitung miteinander verbunden sein.As in FIG. 1 shown, the supply and the discharge can be connected to each other.

Die Regulierung der Strömungsgeschwindigkeit der Umluft und damit die Menge an zugeführter Luft erfolgt über geeignete Mittel zur Regulierung der Gaszu- und abfuhr 10, 11 wie Ventilatoren, die vorzugsweise frequenzgeregelt sein können, oder auch geeignete Pumpen. Zusatzlich können je nach Bedarf Ventile. Mehrweghähne oder ähnliches zur Regulierung der Gaszufuhr und Gasableitung wie z.B. in Figur 1 die Ventile 12. 13 vorgesehen sein.The regulation of the flow rate of the circulating air and thus the amount of supplied air via suitable means for regulating the gas supply and discharge 10, 11 as fans, which may preferably be frequency-controlled, or even suitable pumps. In addition, depending on your needs valves. Reusable or similar valves for regulating the gas supply and gas discharge such as in FIG. 1 the valves 12. 13 may be provided.

Zur Zufuhr von frischer Luft bzw. Ableitung von feuchtigkeitsbeladener Umluft können in dem Umluftleltungssystem entsprechende Vorrichtungen wie z.B. Drosselklappen 14, 15 vorgesehen sein. Diese Vorrichtungen können für die Selbststeuerung über Messstellen geregelt arbeiten.For the supply of fresh air or discharge of moisture-laden circulating air in the Umluftleltungssystem corresponding devices such. Throttle valves 14, 15 may be provided. These devices can work regulated for self-control via measuring points.

Vorzugsweise passiert die Luft vor Einleiten in die Kammer eine Fitervorrichtung (nicht gezeigt), um Verunreinigungen wie Staubpartikel etc. zu entfernen und eine Kontamination der Kammer zu vermeiden.Preferably, before passing into the chamber, the air passes through a fitness device (not shown) to remove contaminants, such as dust particles, etc., and to avoid contamination of the chamber.

Auch kann außerhalb der Kammer 1 in dem Leitungssystem für die Umluft eine Heizvorrichtung und/oder eine Trockenvorrichtung vorgesehen sein, um die Luft vor Einleitung in die Kammer vor zu erwärmen und/oder ihren Feuchtigkeitsgehalt zu vermingern.
So kann in dem Umluftleitungssystem ein Kondensator zur Trocknung der feuchtigkeitsbeladenen Umluft, die die Kammer 1 über die Öffnung 5 verlässt, vorgesehen sein. In diesem Fall kann auf die Drosselklappen 14, 15 verzichtet werden.
Der Kondensator befindet sich in dem Leitungssystem vorzugsweise ausgangsseitig.Also, outside the chamber 1 in the piping system for the circulating air, a heating device and / or a drying device may be provided to the air prior to introduction into the chamber to heat and / or to increase its moisture content.
Thus, a condenser for drying the moisture-laden circulating air, which leaves the chamber 1 via the opening 5, may be provided in the recirculating air line system. In this case, the throttle valves 14, 15 are dispensed with.
The condenser is preferably in the line system on the output side.

Zur Umlufttrocknung kann prinzipiell ein beliebiges Gas wie Umgebungsluft, ein Inertgas oder Mischungen davon verwendet werden. Vorzugsweise wird Umgebungsluft eingesetzt.For circulating air drying can be used in principle any gas such as ambient air, an inert gas or mixtures thereof. Preferably, ambient air is used.

Die Kammer 1 Ist mit einer Vakuumpumpe 9 verbindbar.
In der in Figur 1 gezeigten Vorrichtung ist die Kammer über Leitungen 22a und 7 mit der Vakuumpumpe 9 verbunden, wobei die Leitung 22a zugleich mit Messstellen 23 und 24 verbunden ist.
In Figur 1 ist der Zugang zur Leitung 22a über ein Ventil 16 regelbar, wobei der Vakuumpumpe 9 ein regelbares Ventil 17, wie z.B. ein Butterflyventil, vorgeschaltet sein kann.The chamber 1 is connectable to a vacuum pump 9.
In the in FIG. 1 As shown, the chamber is connected via lines 22a and 7 to the vacuum pump 9, wherein the line 22a is connected to measuring points 23 and 24 at the same time.
In FIG. 1 the access to the line 22a via a valve 16 is controllable, wherein the vacuum pump 9, a controllable valve 17, such as a butterfly valve, may be upstream.

Die erfindungsgemäß einsetzbare Vorrichtung verfügt ferner über eine Gaszuleitung 6, über die ein beliebiges weiteres Gas, vorzugsweise ein Inertgas, eingespeist werden kann. Über die Gaszuleitung 6 kann z.B. die Einspeisung von Gas für die dritte Stufe erfolgen.
Wie in Figur 1 gezeigt, kann die Gaszuleitung 6 mit Reservoirs 8 für verschiedene Gase in Verbindung stehen, so dass je nach Anwendungsfall die Art des eingespeisten Gases geändert oder aber auch eine beliebig zusammengesetzte Mischung elngeleitet werden kann.
Zur Steuerung der Gaszufuhr können in der Gaszuleitung 6 selbst oder in den Zuleitungen zu den einzelnen Reservoirs Ventile. Mehrwegehähne oder ähnliches vorgesehen sein.The device which can be used according to the invention also has a gas feed line 6, via which any desired further gas, preferably an inert gas, can be fed. Via the gas supply line 6, for example, the supply of gas for the third stage can take place.
As in FIG. 1 As shown, the gas supply line 6 can be connected to reservoirs 8 for various gases, so that, depending on the application, the type of gas fed in can be changed or a mixture of any desired composition can also be fed.
To control the gas supply valves in the gas supply line 6 itself or in the supply lines to the individual reservoirs. Multi-way valves or the like may be provided.

Bevorzugt sind hierfür sogenannte Flow controller, die eine geregelte Gaszufuhr erlauben.Preferred for this purpose are so-called flow controllers, which allow a regulated gas supply.

Vorzugsweise wird für die dritte Stufe ein Inertgas wie Stickstoff oder Argon oder Mischungen davon zugesetzt, um Korrosion zu verhindern. Je nach Anwendungsfall kann aber auch Luft oder Sauerstoff etc. eingeleitet werden.
Auch hier kann eine Heizungsvorrichtung, um das Gas vor zu erwärmen, und/oder bei Bedarf eine Trockenvorrichtung vorgesehen sein, um so die Trocknung zu fördem.Preferably, an inert gas such as nitrogen or argon or mixtures thereof is added to the third stage to prevent corrosion. Depending on the application but also air or oxygen, etc. can be initiated.
Again, a heating device may be provided to preheat the gas and / or, if required, a drying device to promote drying.

Optional kann die erfindungsgemäß einsetzbare Vorrichtung je nach Bedarf mit geeigneten weiteren Vorrichtungen ausgestattet sein, z.B. mit einer Belüftung 18, einer Kühlung 19 und/oder einer Abflussleitung 30, die z.B. Ober Ventile 31, 32 und 33 zugeschaltet werden können.Optionally, the device which can be used according to the invention can be equipped, as required, with suitable further devices, e.g. with a vent 18, a cooling 19 and / or a drain line 30, e.g. Upper valves 31, 32 and 33 can be switched on.

Figur 2 zeigt einen Ausschnitt einer Vorrichtung wie sie in Figur 1 gezeigt ist, wobei in der Vakuumkammer aufgehängt ein Behälter - hier eine Trommel 40 - angeordnet ist. Diese Ausgestaltung eignet sich insbesondere zur Trocknung von Schüttgut, wobei der Behälter bzw. die Trommel 40 zur Aufnahme des Schüttgut dient. Die Trommel 40 wird Ober einen Antrieb 41 gedreht oder rotiert, wobei darin befindliches Schüttgut effizient und schnell von Feuchtigkeit befreit wird. FIG. 2 shows a section of a device as shown in FIG. 1 is shown, wherein suspended in the vacuum chamber, a container - here a drum 40 - is arranged. This embodiment is particularly suitable for drying bulk material, wherein the container or the drum 40 serves to receive the bulk material. The drum 40 is rotated or rotated by a drive 41, wherein bulk material therein is efficiently and quickly freed from moisture.

Nach dem erfindungsgemäßen Verfahren erfolgt in einer ersten Stufe eine Wärmebeaufschlagung des oder der zu trocknenden Artikel mit Konvektionswärme. Dies geschieht vorzugsweise durch eine energieintensive aber kurze Strahlungswärme unterstützt durch Umlufttrocknung mittels der Heizvorrichtung 2, 3 und / oder einer externen Heizvorrichtung zur Erwärmung der Umluft vor Eintritt in die Kammer 1. Hierbei nimmt der Artikel Wärmeenergie auf, um einer Vereisung bei Anlegen von Vakuum entgegenzuwirken.
Gleichzeitig erfolgt eine Vortrocknung durch Abführung eines ersten Großteils der Oberflächenfeuchtigkeit.According to the method according to the invention, a heat treatment of the article or articles to be dried with convection heat takes place in a first stage. This is preferably done by an energy-intensive but short radiant heat supported by circulating air drying by means of the heater 2, 3 and / or an external heater for heating the circulating air before entering the chamber 1. Here, the article absorbs heat energy to counteract icing when applying vacuum ,
At the same time, predrying takes place by removal of a first majority of the surface moisture.

In Anschluss an die Wärmebeaufschlagung wird in einer zweiten Stufe Vakuum angelegt bzw, der Druck in der Kammer 1 reduziert Ein großer Teil der Oberflächenfeuchtigkeit ist zu diesem Zeitpunkt bereits entfernt.Following the application of heat, vacuum is applied in a second stage or the pressure in chamber 1 is reduced. A large part of the surface moisture is already removed at this time.

Gleichzeitig mit der Druckreduzierung und/oder in Anschluss daran nachdem die gewünschte Druckreduktion erreicht worden ist, wird zur Förderung der Trocknung die Kammer mit Gas durchströmt (dritte Stufe). Vorzugsweise wird hierbei ein Inertgas verwendet, um gleichzeitig ein Schutzatmosphäre zu erzeugen.Simultaneously with the pressure reduction and / or in connection thereto after the desired pressure reduction has been achieved, the chamber is traversed with gas to promote drying (third stage). Preferably, an inert gas is used to simultaneously generate a protective atmosphere.

Das Vakuum oder ein gewünschter Druck kann über eine entsprechende Regelung der notwendigen Steuerungsgrößen aufrechterhalten werden.The vacuum or a desired pressure can be maintained via a corresponding regulation of the necessary control variables.

Das erfindungsgemäße Verfahren zur Vakuumtrocknung erfolgt selbst bzw programmgesteuert auf Grundlage von Steuerungsgrößen.
Hierbei werden für die einzelnen Stufen, d.h. für die einzelnen Verfahrensmaßnahmen wie Wärmebeaufschlagung. Druckreduzierung und Gaseinleitung, eine oder auch mehrere geeignete Steuerungsgrößen ausgewählt und der Verlauf der Trocknung in den einzelnen Stufen über eine Bestimmung der Istwerte der jeweils ausgewählten Steuerungsgrößen und deren Vergleich mit vorgegebenen Sollwerten beobachtet und gesteuert.The vacuum drying process according to the invention is carried out automatically or programmatically on the basis of control variables.
Here are for the individual stages, ie for the individual procedural measures such as heat. Pressure reduction and gas inlet, one or more suitable control variables selected and observed the course of drying in the individual stages via a determination of the actual values of the respective selected control variables and their comparison with predetermined target values and controlled.

Die Istwerte der einzelnen Steuerungsgrößen können über Messstellen oder Sonden 23, 24, 25, die in der Kammer 1 selbst angebracht oder mit dieser verbunden sein können, gemessen werden, wobei die Messstellen oder Sonden wiederum mit Steuervorrichtungen verbunden sind.The actual values of the individual control variables can be measured via measuring points or probes 23, 24, 25, which can be mounted in or connected to the chamber 1 itself, the measuring points or probes in turn being connected to control devices.

So sind in Figur 1 Temperaturfühler 20, 21 gezeigt, die in der Kammer vorgesehen sind, sowie außerhalb der Kammer Leitungen 22 a, b, c, die die Kammer mit Messvorrichtungen und Steuervorrichtungen für die einzelnen Steuerungsgrößen wie den Druck, den Feuchtegehalt, die Temperatur usw. verbindet.
In dem Leitungssystem für die Umluft können zudem eine oder mehrere Messsonden 25 für den Feuchtigkeitsgehalt der Luft vorgesehen sein.So are in FIG. 1 Temperature sensors 20, 21, which are provided in the chamber, and outside the chamber lines 22 a, b, c, which connects the chamber with measuring devices and control devices for the individual control variables such as pressure, moisture content, temperature, etc.
In addition, one or more measuring probes 25 for the moisture content of the air can be provided in the line system for the circulating air.

In Abhängigkeit der Abweichungen der gemessenen Istwerte von den Sollwerten können die Steuerungsgrößen und / oder die Dauer der einzelnen Stufen geändert werden, so dass auch für kompliziert gebaute, schwer zu trocknende Artikel ein gletchförmig optimales Trocknungsergebnis erzielt werden kann.Depending on the deviations of the measured actual values from the desired values, the control variables and / or the duration of the individual stages can be changed so that a gletch-like optimum drying result can be achieved even for complicatedly constructed, difficult-to-dry articles.

Steuerungsgrößen können sein für die

Wärmebeaufschlagung
die Feuchtigkeit, die Temperatur, die Stellung der Ventilklappen, die Frequenz der Ventilatoren und die Pumpenleistung;
Druckreduzierung
der Druck, unterstützt durch die Feuchtemessung, die Temperatur, Stellung der Ventilklappen;
Gas- bzw. Inertgaszufuhr
die zugeführte Gasmenge, der Druck, die Temperatur, die Ventilstellung und die Feuchternessung. Steuerung der Flow controller.
Control variables can be for the
heat application
the humidity, the temperature, the position of the butterfly valves, the frequency of the fans and the pump capacity;
pressure reduction
the pressure, supported by the humidity measurement, the temperature, position of the valve flaps;
Gas or inert gas supply
the amount of gas supplied, the pressure, the temperature, the valve position and the humidity measurement. Control of the flow controller.

Die Steuerungsgrößen oder mit anderen Worten, die Erfassung und Erfüllung aller wichtigen Parameter, bestimmen über den gesamten Prozess den optimalen Abbruch des jeweiligen Trocknungsschrittes. Auch schwer zugängliche Stellen lassen sich durch dieses System schnell und effizient trocknen.The control quantities or, in other words, the detection and fulfillment of all important parameters, determine the optimal termination of the respective drying step throughout the entire process. Even hard-to-reach places can be quickly and efficiently dried by this system.

Bevorzugt einzustellende Parameter sind derart dass die Trocknung bei einer Temperatur in einem Bereich von 50 °C bis 150 °C erfolgt. Bevorzugte Gase sind Stickstoff oder Argon. Die bevorzugte Durchflussmenge (Flowmenge) kann bei einem Kammervolumen von 1 m3 von etwa 0 bis 50.000 cm3 [seem] betragen, bei einem Vakuum zwischen 10 und 100 mbar.Preferable parameters to be set are such that the drying takes place at a temperature in a range of 50 ° C to 150 ° C. Preferred gases are nitrogen or argon. The preferred flow rate (flow amount) can be from about 0 to 50,000 cm 3 [seagull] for a chamber volume of 1 m 3 , at a vacuum between 10 and 100 mbar.

Erfindungsgemäß findet die Trocknung in einem geschlossenen Trocknungs-system statt, wodurch das Einschleppen von Verunreinigungen aus der Umgebung verhindert wird. Das getrocknete Schüttgut erfüllt daher einen hohen Reinheitsstandard. Zudem ist das erfindungsgemäße Verfahren ökologisch und wirtschaftlich.According to the invention, the drying takes place in a closed drying system, whereby the entrainment of impurities from the environment is prevented. The dried bulk material therefore meets a high purity standard. In addition, the inventive method is ecological and economical.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Vakuumkammervacuum chamber
1a1a
Verschlussshutter
2, 32, 3
Heizvorrichtungheater
44
Öffnung zum Einleiten eines gasförmigen StoffesOpening for introducing a gaseous substance
55
Öffnung zum Ablassen eines gasförmigen StoffesOpening for draining a gaseous substance
66
Gaszuleitunggas supply
77
Verbindung zu einer VakuumpumpeConnection to a vacuum pump
88th
Gasreservoirgas reservoir
99
Vakuumpumpevacuum pump
1010
Ventilatorfan
1111
Ventilatorfan
1212
VentilValve
1313
VentilValve
1414
Drosselklappe zur UmluftzufuhrThrottle valve for circulating air supply
1515
Drosselklappe zur UmluftableitungThrottle valve for circulating air discharge
1616
VentilValve
1717
regelbares Ventiladjustable valve
1818
Belüftungventilation
1919
Kühlungcooling
2020
Temperaturfühlertemperature sensor
2121
Temperaturfühlertemperature sensor
22a, b, c22a, b, c
Verbindungsleitungen zu Messstellen der SteuerungsgrößenConnecting cables to measuring points of the control variables
2323
Messstelle für SteuerungsgrößenMeasuring point for control variables
2424
Messstelle für SteuerungsgrößenMeasuring point for control variables
2525
Messsonde für FeuchtigkeitProbe for moisture
3030
Abflussoutflow
3131
Ventil für AbflussValve for drainage
3232
Ventil für BelüftungValve for ventilation
3333
Ventil für KühlungValve for cooling
4040
Behälter für SchüttgutContainer for bulk material
4141
Antriebdrive

Claims (15)

  1. Method for vacuum drying bulk materials, wherein
    the bulk material requiring drying is heated and pre-dried in an air-tight closable vacuum chamber (1) in a first stage by means of convective heat assisted by a gas flowing through the chamber, whereafter the chamber is evacuated in a second stage, and a gas is fed through the chamber in a third stage, wherein the implementation of the individual stages is effected in program controlled manner by the measurement and determination of control variables, wherein the progression and the duration of the individual stages is controlled in that the actual values of the control variables are measured and compared with predefined set values.
  2. Method in accordance with Claim 1,
    characterized in that
    selection of the control variables for the individual stages is effected autonomously.
  3. Method in accordance with Claim 1 or 2,
    characterized in that
    the control process is effected by at least one control variable selected from humidity, temperature, pressure, gas flow for the circulating air drying process and flow controller.
  4. Method in accordance with any of the Claims 1 to 3,
    characterized in that
    the gas introduced in the first and third stage is ambient air and/or an inert gas.
  5. Method in accordance with Claim 4,
    characterized in that
    ambient air is used as the gas in the first stage and an inert gas is used as the gas in the third stage.
  6. Method in accordance with either of the Claims 4 or 5,
    characterized in that
    the gas for the first and/or third stage is introduced preheated into the chamber (1).
  7. Use of a device for vacuum drying in accordance with a method of the preceding Claims, wherein the device includes an air-tight closable vacuum chamber (1), openings for introducing and discharging gaseous materials (4, 5), a gas inlet line (6), a heating device (2, 3) which is arranged within the vacuum chamber (1) and/or outside the chamber (1) at the input side at the opening for the introduction process (4) and measuring and control devices for the measurement and determination of control variables and for the program controlled implementation of the individual stages and wherein the device is connectable to a vacuum pump (9).
  8. Use in accordance with Claim 7,
    characterized in that
    a device is used which comprises at least one measuring point (23, 24, 25) for the determination of the control variables, which are connected to the vacuum chamber (1) and/or are arranged within the vacuum chamber (1).
  9. Use in accordance with either of the Claims 7 or 8,
    characterized in that
    at least one temperature sensor (20, 21) is arranged within the vacuum chamber (1).
  10. Use in accordance with any of the Claims 7 to 9,
    characterized in that
    means for regulating the inflow and the outflow of the gas (10, 11) are provided.
  11. Use in accordance with Claim 10,
    characterized in that
    the means for regulating the inflow and the outflow of the gas (10, 11) are selected from a fan or a pump.
  12. Use in accordance with Claim 10 or 11,
    characterized in that
    additional valves (12, 13) for regulating the inflow and the outflow of the gas are provided.
  13. Use in accordance with any of the Claims 7 to 12,
    characterized in that
    two oppositely located heat radiators (2, 3) are provided as the heating device in the chamber (1).
  14. Use in accordance with any of the Claims 7 to 13,
    characterized in that
    a container (40) is arranged in the vacuum chamber (1).
  15. Use in accordance with Claim 14,
    characterized in that
    the container (40) is provided in the form of a drum which is rotatable by a drive means (41).
EP00910804A 1999-03-11 2000-03-10 Device and method for vacuum-drying Expired - Lifetime EP1080333B1 (en)

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DE19910723A DE19910723A1 (en) 1999-03-11 1999-03-11 Device and method for vacuum drying
DE19910723 1999-03-11
PCT/EP2000/002111 WO2000053983A1 (en) 1999-03-11 2000-03-10 Device and method for vacuum-drying

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EP1080333B1 true EP1080333B1 (en) 2009-08-19

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Country Link
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AT (1) ATE440253T1 (en)
DE (2) DE19910723A1 (en)
WO (1) WO2000053983A1 (en)

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Cited By (5)

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Publication number Priority date Publication date Assignee Title
US9970708B2 (en) 2012-02-01 2018-05-15 Revive Electronics, LLC Methods and apparatuses for drying electronic devices
US10240867B2 (en) 2012-02-01 2019-03-26 Revive Electronics, LLC Methods and apparatuses for drying electronic devices
US10088230B2 (en) 2012-11-08 2018-10-02 Tekdry International, Inc. Dryer for portable electronics
CN111076514A (en) * 2019-12-27 2020-04-28 苏州立人听力器材有限公司 Drying and dehumidifying method suitable for hearing aid
CN111076514B (en) * 2019-12-27 2021-11-23 苏州立人听力器材有限公司 Drying and dehumidifying method suitable for hearing aid

Also Published As

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WO2000053983A1 (en) 2000-09-14
ATE440253T1 (en) 2009-09-15
DE50015717D1 (en) 2009-10-01
EP1080333A1 (en) 2001-03-07
DE19910723A1 (en) 2000-09-21

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