[go: up one dir, main page]

WO2013034382A1 - Dispositif de chauffage et de séchage d'un article - Google Patents

Dispositif de chauffage et de séchage d'un article Download PDF

Info

Publication number
WO2013034382A1
WO2013034382A1 PCT/EP2012/065510 EP2012065510W WO2013034382A1 WO 2013034382 A1 WO2013034382 A1 WO 2013034382A1 EP 2012065510 W EP2012065510 W EP 2012065510W WO 2013034382 A1 WO2013034382 A1 WO 2013034382A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating
autoclave
gaseous
drying
heating medium
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.)
Ceased
Application number
PCT/EP2012/065510
Other languages
German (de)
English (en)
Inventor
Gerhard Mais
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hedrich Wilhelm Vakuumanlagen GmbH and Co KG
Original Assignee
Hedrich Wilhelm Vakuumanlagen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hedrich Wilhelm Vakuumanlagen GmbH and Co KG filed Critical Hedrich Wilhelm Vakuumanlagen GmbH and Co KG
Priority to EP12743746.5A priority Critical patent/EP2665838B1/fr
Publication of WO2013034382A1 publication Critical patent/WO2013034382A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/353—Resistance heating, e.g. using the materials or objects to be dried as an electrical resistance
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
    • 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
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/02—Drying; Impregnating
    • 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 invention relates to a device for heating and drying a product, which has an electrical insulation, according to the preamble of claim 1. Furthermore, the invention relates to a method for heating and drying of a material having an insulation, according to the preamble of claim 9. From the prior art, various methods and apparatus for drying a good, in particular the insulation of transformers are known. Thus, drying methods are known in which the material to be dried is in an autoclave and heated by means of a circulation process with hot air and then moisture is removed from the material by means of vacuum. In the
  • Heating the walls of the autoclave are heated to a temperature of about 120 ° C.
  • the passing air absorbs the heat from the walls and heats up to approx. 1 10 ° C.
  • the autoclave is evacuated and the residual moisture removed from the insulation.
  • the material to be dried may be, for example, transformers,
  • Capacitors current transformers, current feedthroughs, etc., which have hygroscopic isolations on pulp and / or plastic base. The estate has one
  • Section with insulations in which the water to be extracted is contained, and a core, in which substantially no or no insulation is provided.
  • Winding which contains a solid insulation, by means of a heater and a recirculated in the autoclave hot air flow.
  • the winding is through the Heating device energized and leads to a warming of the insulation from the inside.
  • Isolation which causes a warming of the insulation from the outside.
  • the air temperature is below the temperature of the winding, and the air circulation within the
  • Autoclave is below atmospheric pressure. The drying of the winding takes place in a subsequent heating process drying process in which the autoclave is evacuated.
  • Heating device occurs, there are local overheating in the insulation. These local overheating is exacerbated by the fact that the insulation is a poor conductor of heat and thus the heat within the insulation is very slow
  • the air temperature is limited to a value of about 1 10 ° C, since above this value, a significant reaction of the oxygen takes place with the material of the insulation, which can damage the insulation.
  • DE 196 37 313 A1 discloses a device for heating and drying a product, which operates according to the so-called vapor phase method.
  • kerosene vapor is fed to the autoclave.
  • the admission is set with Kerosindampf and the good finally dried by evacuation of the autoclave in a drying process.
  • US 4,812,608 A discloses a furnace for thermo-magnetic treatment of a toroidal coil.
  • the furnace has heating disks for heating the toroidal coils, and an inert gas can be supplied to the furnace for promoting the heating operation.
  • the inert gas into the furnace interior it can be evacuated.
  • US 2002/0178604 A1 discloses a device for drying and heating a transformer, the device having an autoclave. In the heating process, a condensation of the solvent vapor takes place at the solid insulation.
  • the object of the invention is to provide an apparatus and a method for heating and drying a good, at least the above
  • an apparatus and a method for heating and drying a good which has an electrical insulation.
  • the device has an evacuable autoclave into which a gaseous heating medium can be introduced.
  • the device is designed such that during the
  • the gaseous heating medium is in particular an inert gas.
  • an autoclave is understood as meaning a substantially vacuum-tight chamber or a vacuum-tight housing.
  • the autoclave is additionally designed in such a way that an overpressure can prevail in the chamber or the housing.
  • inert gas means all gases which do not react with the isolation of the material or whose tendency to react with the insulation is less than the propensity to react of the air, in particular of the oxygen.
  • nitrogen can be used as the inert gas. The advantage of using nitrogen is that it can be procured inexpensively and thus the
  • the insulation may be a hygroscopic isolation on pulp and / or cellulose
  • inert gas as a gaseous heating medium has the advantage that the damaging effect of oxygen on the insulation is excluded because the gaseous heating medium does not react with the insulating material and thus can not damage it.
  • the inert gas can be heated to temperatures of over 120 ° C, without having to fear damage to the insulation. Due to the high temperature of the gaseous heating medium, the convective heat input into the insulation increases, which reduces the heating time of the insulation.
  • the autoclave may have a discharge line and a feed line connected to the discharge line.
  • the autoclave, the The discharge line and the supply line can form a circle, in particular a closed heating circuit.
  • Heating process is not discharged into the environment, causing the
  • the gaseous heating medium or the mixture of gaseous heating medium and the evaporated water from the insulation flows during the heating process within the circle in which it can be dried and / or heated.
  • the autoclave is evacuated. The evacuation of the autoclave has the advantage that an additional diffusion gradient for the
  • the mixture in the autoclave can be removed from the autoclave via a vacuum pump set.
  • the vacuum pump set may be formed as an open circuit. In this case, the discharged mixture is discharged into the environment.
  • the vacuum pump set as a
  • a dryer may be provided for separating the condensed water from the mixture, so as to ensure that only the gaseous dry heating medium is returned to the autoclave.
  • the heating process can take place at several intervals in which the material is heated and subsequently the pressure in the autoclave is lowered.
  • the pressure is not lowered as much as in the final drying process, in which the autoclave is evacuated.
  • a circulation device may be provided within the autoclave.
  • the circulation of the gaseous heating medium in the autoclave can be carried out in particular at atmospheric pressure or overpressure.
  • the circulation of the gaseous heating medium at overpressure offers the advantage that the energy content of the Heating medium and thus the heat transfer to the goods is high.
  • baffles may be provided within the autoclave, which can deflect the gaseous heating medium, so that heating of the goods can be done, for example, from bottom to top.
  • heating circuit may be between the discharge line and the supply line
  • the mixture taken from the autoclave is dried from, for example, inert gas and steam.
  • a heat exchanger can be arranged between the dryer and the discharge line.
  • the mixture taken from the autoclave is cooled before entering the dryer.
  • the released during the cooling heat can be used to heat the gaseous heating medium before it is fed via the supply line to the autoclave.
  • the provision of the heat exchanger has the advantage that the energy loss of the device is reduced.
  • a further heat exchanger may be provided, which is arranged between the dryer and the feed line. In the heat exchanger, the gaseous heating medium can be heated prior to feeding into the autoclave.
  • the supply of heated, dry gaseous heating medium in the autoclave has the advantage that in addition to the heating of the insulation for the steam generated in the insulation, a partial pressure gradient is generated and thus there is a diffusion from the isolation to the gaseous dry heating medium.
  • Heating process a pre-drying of the insulation can be achieved.
  • a heating device for supplying energy to the goods can be provided in the device.
  • the heater may be formed for example as a resistance heater, which allows a conversion of electrical energy into thermal energy.
  • the energy supply to the good can be provided to a provided in the good electrical line, in particular a coil-shaped line, done.
  • the line, in particular the transformer coil is arranged in the material such that both the insulation and the core of the material, which has substantially no insulation, are warmed up.
  • Heating device allows uniform heating of poor thermal conductivity insulation.
  • the gaseous heating medium may have a higher temperature than the located in the estate heated, electrical line, in particular a coil-shaped line.
  • the energy supply from the heater to the estate can during the
  • Drying process has the advantage of compensating for heat losses that may occur during the drying process.
  • a drying process has the advantage of compensating for heat losses that may occur during the drying process.
  • heat loss may be due to heat being transferred from the insulation of the material to a portion of the good adjacent to the insulation, such as e.g. the core of the material flows, whose temperature is lower than the temperature of the insulation.
  • Energy supply by the heater can be done during all or part of the drying process. In particular, the energy supply can be switched off towards the end of the drying process.
  • the core of the material can be heated to a temperature where the heat flow in the insulation to this section is low.
  • the core of the material can be heated in such a way that its temperature is above a condensation temperature of the insulation of the material
  • the material is designed as a transformer.
  • the core corresponds to the transformer core, which may consist of individual, mutually electrically insulated core sheets.
  • the heating device energizes a low voltage coil and / or a high voltage coil of the transformer.
  • a sole energization of the undervoltage coil has the advantage that the transformer core can be heated in a simple manner. This is possible because the undervoltage coil is located close to the core of the transformer. In particular, it is possible that the high-voltage coil and / or
  • Undervoltage coil can be energized differently during the heating process or the drying process. So both coils can during the
  • Heating process and during the drying process only the undervoltage coil are energized.
  • the two coils can be energized to different degrees.
  • the heater can be DC or low frequency or
  • Radio frequency device be designed.
  • Heating device as a high-frequency device has the advantage that the skin effect can be exploited. As a result of the skin effect is high-frequency
  • Vacuum pump set be provided by means of which a measurement of the dew point can be done in a vacuum line. Depending on the result of the measurement, the drying process can be ended.
  • the invention is not limited to the drying of a product whose insulation contains water.
  • the device according to the invention or the process according to the invention also dried a good that has a different substance to be evaporated than water.
  • FIG. 1 shows a basic structure of a device for heating and drying a good
  • FIG. 2 shows a detail of a schematic representation of a transformer.
  • the device 1 shown in Figure 1 for heating and drying a good 4 has an autoclave 10, a heater 14, a heating circuit 2 and a
  • the autoclave 10 is formed as a chamber which is designed so that it can be both evacuated and pressurized. Within the autoclave 10, the material is arranged, wherein it may be, for example, a transformer active part 4, at the estate. Furthermore, a circulation device 13 is provided within the autoclave 10, by means of which the gaseous heating medium in the autoclave 10 can be circulated. The circulating device 13 is driven by a motor, not shown in the figures.
  • the heating circuit 2 is formed as a closed circuit and has a discharge line 23 and a supply line 24, which are connected to each other. Via the discharge line 23, the mixture contained in the autoclave 10 is removed and fed via the feed line 24 to the autoclave 10. The heating circuit 2 has, seen in the flow direction of the removed mixture, a first
  • Heat exchanger 22 a dryer 20 and a second heat exchanger 21.
  • the vacuum pump set 3 is designed to be open and has a vacuum line 30 which communicates with the interior of the autoclave 10. Furthermore, the
  • Vacuum pump set 3 a measuring unit 31, by means of the dew point in a
  • the heater 14 is connected to the transformer 4, in particular the coil of the transformer 4.
  • the transformer 4 shown in FIG. 2 has a transformer core 40 and a coil.
  • the coil has a low voltage coil 41 and a high voltage coil 42, both of which extend around the transformer core 40.
  • the undervoltage coil 41 is arranged closer to the transformer core 40 than the high-voltage coil 42.
  • FIG. 1 In the case of that shown in FIG. 1
  • the gaseous heating medium used is inert gas, in particular nitrogen.
  • Drying a transformer described.
  • the operation of the device 1 is not limited to heating and drying a transformer.
  • the walls of the autoclave 10 are heated, whereby the gaseous heating medium in the autoclave 10 also heats up.
  • the circulation device 13 the gaseous heating medium is circulated within the autoclave 10.
  • the circulation of the gaseous heating medium is a Heat emission from this to the not shown in the figures insulation of the transformer 4.
  • the dry gaseous heating medium leads to the heating in addition to a partial pressure gradient is generated, so that there is a diffusion of water vapor from the insulation to the gaseous heating medium.
  • the mixture of gaseous heating medium and water vapor is passed over the
  • Outlet line 23 is removed from the autoclave 10 and flows through the first
  • Heat exchanger 22 in which it is cooled. Following this, the mixture flows through a dryer 20, in which the water vapor is deposited. The condensed water flows into a collecting tank, not shown in the figures. The dried gaseous heating medium flows through the dryer 20 after a second heat exchanger 21, in which the gaseous heating medium is heated. During the heating process, the coil of the transformer 4 through the
  • Heating device 14 energized. This ensures that the transformer core 40 and the insulation, not shown, are heated, so that a uniform
  • Temperature distribution within the transformer 4 is achieved. As soon as the insulation 4 of the transformer has reached a specific temperature, in particular 120 ° C., the heating process is ended and the drying process is started. During the drying process, the mixture in the autoclave is sucked off via the vacuum line 30 or the autoclave is evacuated. By lowering the pressure in the autoclave, an additional diffusion gradient for the water vapor is generated, whereby the drying of the insulation accelerates and / or improves. The extracted mixture is discharged into the environment, wherein previously a heat exchange in the third heat exchanger 32 between the
  • Measuring unit 31 is measured in the bypass line 32, the dew point of the extracted mixture and decided depending on this value, whether the drying process is finished or not. reference numeral

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un dispositif (1) de chauffage et de séchage d'un article (11) présentant une isolation électrique (11), et un procédé de chauffage et de séchage d'un article (11). Le dispositif (1) comporte un autoclave (10) dans lequel peut être introduit un milieu caloporteur gazeux. Le milieu caloporteur gazeux reste dans un état gazeux pendant le processus de chauffage, le milieu caloporteur gazeux étant un gaz inerte.
PCT/EP2012/065510 2011-09-06 2012-08-08 Dispositif de chauffage et de séchage d'un article Ceased WO2013034382A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12743746.5A EP2665838B1 (fr) 2011-09-06 2012-08-08 Procédé de chauffage et de séchage d'un article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEDE102011053288.9 2011-09-06
DE102011053288A DE102011053288A1 (de) 2011-09-06 2011-09-06 Vorrichtung zum Aufheizen und Trocknen eines Gutes

Publications (1)

Publication Number Publication Date
WO2013034382A1 true WO2013034382A1 (fr) 2013-03-14

Family

ID=46634160

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/065510 Ceased WO2013034382A1 (fr) 2011-09-06 2012-08-08 Dispositif de chauffage et de séchage d'un article

Country Status (3)

Country Link
EP (1) EP2665838B1 (fr)
DE (1) DE102011053288A1 (fr)
WO (1) WO2013034382A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118129417A (zh) * 2024-04-19 2024-06-04 吴江变压器有限公司 一种变压器器身的真空干燥方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015206744A1 (de) * 2015-04-15 2016-11-03 Rwe Deutschland Ag Verfahren zum Trocknen eines Gasraums sowie Anordnung umfassend einen schutzgasbefüllten Gasraum

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4812608A (en) 1988-03-22 1989-03-14 Hydro-Quebec Oven for thermo-magnetic treatment of toroidal coils of amorphous ferro-magnetic ribbon material
DE19637313A1 (de) 1995-09-16 1997-03-27 Hedrich Vakuumanlagen Wilhelm Vorrichtung zum Aufheizen von Teilen
EP0801405A2 (fr) 1996-04-09 1997-10-15 MICAFIL Vakuumtechnik AG Procédé de préséchage d'un bloc de bobine contenant au moins un enroulement et isolation solide et dispositif pour la mise en oeuvre de ce procédé
EP1248061A1 (fr) * 2001-04-06 2002-10-09 Micafil Ag Procédé de séchage des isolants solides d'un appareil électrique
US20020178604A1 (en) 2001-04-06 2002-12-05 Paul Gmeiner Apparatus for drying solid insulation of an electrical device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4812608A (en) 1988-03-22 1989-03-14 Hydro-Quebec Oven for thermo-magnetic treatment of toroidal coils of amorphous ferro-magnetic ribbon material
DE19637313A1 (de) 1995-09-16 1997-03-27 Hedrich Vakuumanlagen Wilhelm Vorrichtung zum Aufheizen von Teilen
EP0801405A2 (fr) 1996-04-09 1997-10-15 MICAFIL Vakuumtechnik AG Procédé de préséchage d'un bloc de bobine contenant au moins un enroulement et isolation solide et dispositif pour la mise en oeuvre de ce procédé
EP1248061A1 (fr) * 2001-04-06 2002-10-09 Micafil Ag Procédé de séchage des isolants solides d'un appareil électrique
US20020178604A1 (en) 2001-04-06 2002-12-05 Paul Gmeiner Apparatus for drying solid insulation of an electrical device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GMEINER P K: "Modern vapour drying processes and plants", ANNOUNCEMENT MICAFIL VAKUUMTECHNIK, XX, XX, 1 February 1992 (1992-02-01), pages W, XP002016470 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118129417A (zh) * 2024-04-19 2024-06-04 吴江变压器有限公司 一种变压器器身的真空干燥方法

Also Published As

Publication number Publication date
EP2665838A1 (fr) 2013-11-27
EP2665838B1 (fr) 2016-10-12
DE102011053288A1 (de) 2013-03-07

Similar Documents

Publication Publication Date Title
EP0386436B1 (fr) Procédé rationnel de désacidification non polluante et dans la masse de livres et autres produits papetiers
DE3531336C2 (de) Verfahren zur Behandlung von Tabakblättern zur Lagerung
EP1317191B1 (fr) Procede pour ameliorer le pouvoir de remplissage du tabac
DE112018000387B4 (de) Vakuumtrocknungsvorrichtung und Vakuumtrocknungsverfahren
EP2665838B1 (fr) Procédé de chauffage et de séchage d'un article
AT516039B1 (de) Anordnung zur Unterdrückung von Kondenswasserbildung in Gehäusen für elektrische oder elektronische Schaltungen
DE19501323C2 (de) Verfahren zur Trocknung der Feststoffisolationen eines in einer elektrischen Anlage angeordneten Transformators
DE3513021A1 (de) Verfahren und vorrichtung zum waermebehandeln von fliessfaehigen materialien
DE19637313C2 (de) Vorrichtung zum Aufheizen von Teilen
EP1662017B1 (fr) Dispositif pour l'évaporation de materiaux
DE3421091A1 (de) Verfahren und vorrichtung zum expandieren von tabakblaettern
DE2358067B2 (de) Verfahren zum Trocknen elektrischer oder anderer Geräte
AT526369A1 (de) Brennstoffzellensystem zur Erzeugung elektrischer Energie
DE3642175A1 (de) Verfahren und vorrichtung zum behandeln von lebensmittelware mit rauch
DE102010045239B4 (de) Verfahren und Anordnung zum Trocknen einer Transformatorkomponente
DE102005001683A1 (de) Verfahren und Vorrichtung zum Trocknen von Lackschichten
EP2148157B1 (fr) Dispositif de chauffage et de séchage d'une marchandise selon le procédé de phase vapeur
EP0801405B1 (fr) Procédé de préséchage d'un bloc de bobine contenant au moins un enroulement et isolation solide et dispositif pour la mise en oeuvre de ce procédé
DE19826682C2 (de) Vorrichtung zum Aufheizen von Teilen
DE202010012737U1 (de) Erwärmungs- und Trocknungsvorrichtung
DE2925742C2 (de) Verfahren und Vorrichtung zur Trocknung und Veredelung textiler Wickelkörper und Fasern
DE924860C (de) Verfahren und Einrichtung zum Trocknen von Zucker in Koerperform mittels Hochfrequenz
DE944968C (de) Verfahren zur Entfernung von Feuchtigkeit
DE3715235A1 (de) Verfahren und vorrichtung zum extrahieren von oel oder polychloriertem biphenyl aus impraegnierten elektrischen teilen mittels eines loesungsmittels sowie zur destillation des loesungsmittels
DE3003156C2 (fr)

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12743746

Country of ref document: EP

Kind code of ref document: A1

REEP Request for entry into the european phase

Ref document number: 2012743746

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2012743746

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE