EP0105174A1 - Capacitive high-frequency continuous furnace - Google Patents

Capacitive high-frequency continuous furnace Download PDF

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Publication number
EP0105174A1
EP0105174A1 EP83108345A EP83108345A EP0105174A1 EP 0105174 A1 EP0105174 A1 EP 0105174A1 EP 83108345 A EP83108345 A EP 83108345A EP 83108345 A EP83108345 A EP 83108345A EP 0105174 A1 EP0105174 A1 EP 0105174A1
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EP
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Prior art keywords
furnace
interior
frequency continuous
continuous furnace
frequency
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Granted
Application number
EP83108345A
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German (de)
French (fr)
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EP0105174B1 (en
Inventor
Hans-Christian Dipl.-Ing. Grassmann
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Siemens AG
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Siemens AG
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Publication of EP0105174A1 publication Critical patent/EP0105174A1/en
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Publication of EP0105174B1 publication Critical patent/EP0105174B1/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/60—Arrangements for continuous movement of material
    • 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
    • F26B3/343—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 in combination with convection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the invention relates to a capacitive high-frequency continuous furnace for the thermal treatment of textile goods, in particular chemical fiber cables, in which the electrodes are connected to a high-frequency generator and the interior of the furnace is connected to an air source.
  • High-frequency furnaces of the aforementioned type have proven themselves well for heating a wide variety of materials.
  • the possible heating output of the furnace is among others essentially limited by the permissible field strength above which electrical breakdowns occur.
  • the structural dimensions are generally also determined. If you now want to integrate such treatment systems into an overall system, it would often be of interest if you could get by with a reduced construction volume.
  • the object of the present invention is therefore to design a capacitive furnace of the type mentioned in such a way that the given for given dimensions led electrical power can be increased, or vice versa, that the dimensions can be reduced for a given power, but still safe electrical operation should be present in every operating state.
  • the continuous furnace is designed for interior pressures between 1.5 and 6 bar and an overpressure in this area can be generated by the air source in the interior of the furnace.
  • the overpressure in the furnace interior falls below a predetermined value, the voltage of the high-frequency generator can be reduced or switched off automatically. Since the breakdown field strength is largely proportional to the pressure, the energy density that can be implemented per furnace volume can be increased in this way without the risk of breakdown.
  • a high-frequency electrode 21 is provided above the fiber cable 3, which is connected to a high frequency via a coupling capacitor 22 quenzgenerator 2 of 15 MHz is connected.
  • the fiber cable 3 leaves the furnace via a further pressure lock 13 and is transported by a conveyor belt 15 to a further system component.
  • this high-frequency furnace is simultaneously designed as a pressure dryer, ie the housing of the furnace 1 is designed for an internal pressure of, for example, 4 bar.
  • a compressed air source 6 is provided as the gas source and is connected to the interior of the furnace.
  • the compressed air can also be preheated to boost the heating.
  • part of the air can also be drawn out of the oven and conducted in a closed circuit, for example to remove moisture. This can be done, for example, by condensation in a heat exchanger 71, from which the condensate is then removed (arrow 72).
  • the pressure p prevailing in the interior of the furnace is detected by a measuring element 63 and can e.g. can be used in a regulator 61 for regulating the air pressure. It is essential, however, that this pressure measuring element is connected to a monitoring element 62 which, when the pressure drops below a predetermined value, e.g. due to a leaky lock or other leak, the voltage of the high-frequency generator 2 is reduced or the system is switched off. This is important because, as a result of the higher pressure, work is also carried out with correspondingly higher field strengths, which would then lead to electrical flashovers if the pressure drops. If, for example, an oven without overpressure is operated with 0.5 to 5 kV per cm field strength, the permissible field strength can easily be doubled in the oven according to the invention at a pressure of 4 bar without arcing.
  • gas should also be understood to mean steam of the appropriate pressure and temperature.

Abstract

1. Capacitive high-frequency continuous furnace for the thermal treatment of textile products, in particular of man-made fibre cables, wherein electrodes are connected to a high-frequency generator and the inside of the furnace is connected to a gas source, characterised in that the furnace (1) is designed to withstand excess internal pressures between 1.5 and 6 bar, that an excess pressure in this region is produced in the interior of the furnace by the gas source (6), and that when the excess pressure in the interior of the furnace lowers to a predeterminable value the voltage of the high-frequency generator (2) is automatically reduced or switched off.

Description

Die Erfindung bezieht sich auf einen kapazitiven Hochfrequenzdurchlaufofen zur thermischen Behandlung von Textilgütern, insbesondere von Chemiefaserkabeln, bei dem die Elektroden an einen Hochfrequenzgenerator angeschlossen sind und der Ofeninnenraum mit einer Luftquelle verbunden ist.The invention relates to a capacitive high-frequency continuous furnace for the thermal treatment of textile goods, in particular chemical fiber cables, in which the electrodes are connected to a high-frequency generator and the interior of the furnace is connected to an air source.

Mit diesem Oberbegriff wird auf eine Anordnung Bezug genommen, wie sie beispielsweise aus der DE-OS 28 17 067 bekannt ist. Bei dieser Anordnung werden die Chemiefaserkabel auf einem geerdeten Siebband mit Öffnungen durch den Ofen transportiert. In den Ofenraum wird Heißluft eingeblasen und durchströmt die Faserkabel. Hierdurch wird zusätzlich zur kapazitiven Trocknung eine Heißlufttrocknung erreicht und das Gut auf dem Siebband fixiert.With this preamble reference is made to an arrangement as is known for example from DE-OS 28 17 067. With this arrangement, the chemical fiber cables are transported through the oven on an earthed sieve belt with openings. Hot air is blown into the furnace chamber and flows through the fiber cables. As a result, hot air drying is achieved in addition to capacitive drying and the material is fixed on the screen belt.

Hochfrequenzöfen der vorgenannten Art haben sich gut zur Erwärmung der verschiedensten Materialien bewährt. Die mögliche Erwärmungsleistung des Ofens ist u.a. wesentlich durch die zulässige Feldstärke beschränkt, oberhalb derer elektrische Durchschläge auftreten. Bei vorgegebener Leistung sind damit im allgemeinen auch die baulichen Abmessungen festgelegt. Will man nun derartige Behandlungsanlagen in eine Gesamtanlage integrieren, so wäre es jedoch häufig von Interesse, wenn man mit verringertem Bauvolumen auskommen könnte.High-frequency furnaces of the aforementioned type have proven themselves well for heating a wide variety of materials. The possible heating output of the furnace is among others essentially limited by the permissible field strength above which electrical breakdowns occur. For a given performance, the structural dimensions are generally also determined. If you now want to integrate such treatment systems into an overall system, it would often be of interest if you could get by with a reduced construction volume.

Die Aufgabe der vorliegenden Erfindung besteht daher darin, einen kapazitiven Ofen der eingangs genannten Art so auszubilden, daß bei gegebenen Abmessungen die zugeführten elektrischen Leistungen gesteigert werden können, oder umgekehrt, daß bei vorgegebener Leistung die Abmessungen verringert werden können, wobei aber trotzdem in jedem Betriebszustand ein sicherer elektrischer Betrieb vorhanden sein soll.The object of the present invention is therefore to design a capacitive furnace of the type mentioned in such a way that the given for given dimensions led electrical power can be increased, or vice versa, that the dimensions can be reduced for a given power, but still safe electrical operation should be present in every operating state.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Durchlaufofen auf Innenraumdrücke zwischen 1,5 und 6 Bar ausgelegt ist und durch die Luftquelle im Ofeninnenraum ein in diesem Bereich liegender Überdruck erzeugbar ist. Beim Absinken des Überdruckes im Ofeninnenraum unter einem vorgegebenen Wert ist die Spannung des Hochfrequenzgenerators selbsttätig verringerbar oder abschaltbar. Da die Durchschlagsfeldstärke weitgehend dem Druck proportional ist, läßt sich auf diese Weise die pro Ofenvolumen umsetzbare Energiedichte ohne die Gefahr eines Durchschlages erhöhen.This object is achieved in that the continuous furnace is designed for interior pressures between 1.5 and 6 bar and an overpressure in this area can be generated by the air source in the interior of the furnace. When the overpressure in the furnace interior falls below a predetermined value, the voltage of the high-frequency generator can be reduced or switched off automatically. Since the breakdown field strength is largely proportional to the pressure, the energy density that can be implemented per furnace volume can be increased in this way without the risk of breakdown.

Das Arbeiten mit hohen Drücken hat außerdem noch den erheblichen technischen Vorteil, daß auch die Verdampfungstemperatur entsprechend ansteigt, so daß z.B. noch bei 130°C keine Verdampfung stattfindet und damit in diesem Temperaturbereich nur unter Anwesenheit von Feuchtigkeit stattfindende Vorgänge besser beherrscht werden. Ein solcher Fall liegt z.B. beim nassen Fixieren von Faserkabeln vor.Working at high pressures also has the considerable technical advantage that the evaporation temperature also rises accordingly, so that e.g. there is still no evaporation at 130 ° C, so that processes taking place in this temperature range can only be better controlled in the presence of moisture. Such a case is e.g. when fixing fiber cables wet.

Anhand einer Zeichnung sei die Erfindung näher erläutert.The invention will be explained in more detail with reference to a drawing.

Das auf einem Förderband 8 antransportierte mäanderförmig gefaltete Faserkabel 3 gelangt über eine aus Gummiwalzen 12 bestehende Dichtungsschleuse 12 mit Einführteil 11 auf ein in Richtung des Pfeiles 5 laufendes geerdetes metallisches Förderband 4, welches als Elektrode wirkt. Über dem Faserkabel 3 ist eine Hochfrequenzelektrode 21 vorgesehen, die über einen Koppelkondensator 22 mit einem Hochfrequenzgenerator 2 von z.B. 15 MHz verbunden ist. Nach der thermischen Behandlung verläßt das Faserkabel 3 den Ofen über eine weitere Druckschleuse 13 und wird von einem Förderband 15 zu einem weiteren Anlagebauteil transportiert. Das wesentlich Neue ist nun darin zu sehen, daß dieser Hochfrequenzofen gleichzeitig als Drucktrockner ausgebildet ist, d.h., das Gehäuse des Ofens 1 ist auf einen Innenraumdruck von z.B. 4 Bar ausgelegt. Zur Erzeugung dieses Druckes ist als Gasquelle eine Druckluftquelle 6 vorgesehen, die mit dem Ofeninnenraum verbunden ist. Die Druckluft kann gleichzeitig zur Verstärkung der Heizung vorgeheizt sein. Wie durch die Leitung 7 angedeutet, kann auch ein Teil der Luft aus dem Ofen wieder abgezogen und im geschlossenen Kreislauf geführt werden, z.B. um Feuchte zu beseitigen. Dies kann z.B. durch Kondensation in einem Wärmetauscher 71 geschehen, aus dem dann das Kondensat abgeführt wird (Pfeil 72).The meandering folded fiber cable 3, which is transported on a conveyor belt 8, passes via a sealing lock 12 consisting of rubber rollers 12 with an insertion part 11 to a grounded metallic conveyor belt 4 running in the direction of the arrow 5, which acts as an electrode. A high-frequency electrode 21 is provided above the fiber cable 3, which is connected to a high frequency via a coupling capacitor 22 quenzgenerator 2 of 15 MHz is connected. After the thermal treatment, the fiber cable 3 leaves the furnace via a further pressure lock 13 and is transported by a conveyor belt 15 to a further system component. What is essentially new is that this high-frequency furnace is simultaneously designed as a pressure dryer, ie the housing of the furnace 1 is designed for an internal pressure of, for example, 4 bar. To generate this pressure, a compressed air source 6 is provided as the gas source and is connected to the interior of the furnace. The compressed air can also be preheated to boost the heating. As indicated by line 7, part of the air can also be drawn out of the oven and conducted in a closed circuit, for example to remove moisture. This can be done, for example, by condensation in a heat exchanger 71, from which the condensate is then removed (arrow 72).

Der im Ofeninnenraum herrschende Druck p wird durch ein Meßglied 63 erfaßt und kann z.B. in einem Regler 61 zum Regeln des Luftdruckes verwendet werden. Wesentlich ist jedoch, daß dieses Druckmeßglied mit einem Überwachungsglied 62 verbunden ist, das bei einem Abfallen des Drukkes unter einen vorgegebenen Wert, z.B. infolge einer undichten Schleuse oder einer sonstigen Undichtigkeit, die Spannung des Hochfrequenzgenerators 2 verringert oder die Anlage abschaltet. Dies ist insofern wichtig, da infolge des höheren Druckes auch mit entsprechend höheren Feldstärken gearbeitet wird, die dann bei einem Absinken des Druckes zu elektrischen Überschlägen führen würden. Wird beispielsweise bei einem Ofen ohne Überdruck mit 0,5 bis 5 kV pro cm Feldstärke gearbeitet, so kann in dem erfindungsgemäßen Ofen bei einem Druck von 4 Bar die zulässige Feldstärke leicht verdoppelt werden, ohne daß es zu Überschlägen kommt.The pressure p prevailing in the interior of the furnace is detected by a measuring element 63 and can e.g. can be used in a regulator 61 for regulating the air pressure. It is essential, however, that this pressure measuring element is connected to a monitoring element 62 which, when the pressure drops below a predetermined value, e.g. due to a leaky lock or other leak, the voltage of the high-frequency generator 2 is reduced or the system is switched off. This is important because, as a result of the higher pressure, work is also carried out with correspondingly higher field strengths, which would then lead to electrical flashovers if the pressure drops. If, for example, an oven without overpressure is operated with 0.5 to 5 kV per cm field strength, the permissible field strength can easily be doubled in the oven according to the invention at a pressure of 4 bar without arcing.

Unter dem Begriff "Gas" soll auch Dampf von entsprechendem Druck und Temperatur verstanden werden.The term "gas" should also be understood to mean steam of the appropriate pressure and temperature.

Claims (6)

1. Kapazitiver Hochfrequenzdurchlaufofen zur thermischen Behandlung von Textilgütern, insbesondere von Chemiefaserkabeln, bei dem die Elektroden an einen Hochfrequenzgenerator angeschlossen sind und der Ofeninnenraum mit einer Gasquelle verbunden ist, dadurch gekennzeichnet, daß der Ofen (1) auf Innenraumdrücke zwischen 1,5 und 6 Bar ausgelegt ist und durch die Gasquelle (6) ein in diesem Bereich liegender Überdruck im Ofeninnenraum erzeugbar ist.1. Capacitive high-frequency continuous furnace for the thermal treatment of textile goods, in particular chemical fiber cables, in which the electrodes are connected to a high-frequency generator and the interior of the furnace is connected to a gas source, characterized in that the furnace (1) to interior pressures between 1.5 and 6 bar is designed and the gas source (6) generates an overpressure in this area in the interior of the furnace. 2. Kapazitiver Hochfrequenzdurchlaufofen nach Anspruch 1, dadurch gekennzeichnet, daß beim Absinken des Überdruckes im Ofeninnenraum unter einem vorgegebenen Wert die Spannung des Hochfrequenzgenerators (2) selbsttätig verringerbar oder abschaltbar ist.2. Capacitive high-frequency continuous furnace according to claim 1, characterized in that when the overpressure in the interior of the furnace drops below a predetermined value, the voltage of the high-frequency generator (2) can be reduced or switched off automatically. 3. Kapazitiver Hochfrequenzdurchlaufofen nach Anspruch l, gekennzeichnet durch elastische Druckdichtungen (12, 13) am Ein- und Ausgang.3. Capacitive high-frequency continuous furnace according to claim l, characterized by elastic pressure seals (12, 13) at the entrance and exit. 4. Kapazitiver Hochfrequenzdurchlaufofen nach Anspruch 1, gekennzeichnet durch die Verwendung einer Gasquelle (6) mit Heizvorrichtung.4. Capacitive high-frequency continuous furnace according to claim 1, characterized by the use of a gas source (6) with a heating device. 5. Kapazitiver Hochfrequenzdurchlaufofen nach Anspruch 1, dadurch gekennzeichnet, daß als Gasquelle ein Heißdampferzeuger dient.5. Capacitive high-frequency continuous furnace according to claim 1, characterized in that a superheated steam generator is used as the gas source. 6. Kapazitiver Hochfrequenzdurchlaufofen, dadurch gekennzeichnet, daß das Gas im geschlossenen Kreislauf (7) über einen zur Feuchtekondensation und Kondensatabfuhr dienenden Wärmetauscher (71) geführt ist.6. Capacitive high-frequency continuous furnace, characterized in that the gas is guided in a closed circuit (7) via a heat exchanger (71) used for moisture condensation and condensate removal.
EP83108345A 1982-09-06 1983-08-24 Capacitive high-frequency continuous furnace Expired EP0105174B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823233069 DE3233069A1 (en) 1982-09-06 1982-09-06 CAPACITIVE HIGH-FREQUENCY CONTINUOUS
DE3233069 1982-09-06

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EP0105174A1 true EP0105174A1 (en) 1984-04-11
EP0105174B1 EP0105174B1 (en) 1987-04-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512481A1 (en) * 1991-05-10 1992-11-11 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Process and apparatus for drying materials
DE102010001483A1 (en) * 2010-02-02 2011-08-04 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Food product preparing method, involves bringing food product between two array elements of cooking appliance, where gaseous atmosphere present between food product and one array element is changed into physical parameter in defined manner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2446471A1 (en) * 1973-10-12 1975-04-24 Rene Anrep METHOD OF DRYING AND STERILIZATION USING MICROWAVES
DE2817067A1 (en) * 1978-04-19 1979-10-25 Siemens Ag CAPACITIVE HIGH FREQUENCY OVEN FOR DRYING FOLDED FIBER CABLES, IN PARTICULAR CHEMICAL FIBER CABLES
CH627544A5 (en) * 1976-10-07 1982-01-15 Sagami Chem Res METHOD AND SYSTEM FOR DEHYDRATING A SAMPLE.
WO1982001060A1 (en) * 1980-09-24 1982-04-01 Processes Ltd Jetsonic Sonic energy perforated drum for rotary dryers
WO1982001766A1 (en) * 1980-11-14 1982-05-27 Risman Per O A method of carrying out the drying of wooden objects

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2446471A1 (en) * 1973-10-12 1975-04-24 Rene Anrep METHOD OF DRYING AND STERILIZATION USING MICROWAVES
CH627544A5 (en) * 1976-10-07 1982-01-15 Sagami Chem Res METHOD AND SYSTEM FOR DEHYDRATING A SAMPLE.
DE2817067A1 (en) * 1978-04-19 1979-10-25 Siemens Ag CAPACITIVE HIGH FREQUENCY OVEN FOR DRYING FOLDED FIBER CABLES, IN PARTICULAR CHEMICAL FIBER CABLES
WO1982001060A1 (en) * 1980-09-24 1982-04-01 Processes Ltd Jetsonic Sonic energy perforated drum for rotary dryers
WO1982001766A1 (en) * 1980-11-14 1982-05-27 Risman Per O A method of carrying out the drying of wooden objects

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512481A1 (en) * 1991-05-10 1992-11-11 SICOWA Verfahrenstechnik für Baustoffe GmbH & Co. KG Process and apparatus for drying materials
US5373646A (en) * 1991-05-10 1994-12-20 Sicowa Verfahrenstechnik Fur Baustoffe Gmbh & Co. Kg Process and apparatus for drying material to be dried
DE102010001483A1 (en) * 2010-02-02 2011-08-04 BSH Bosch und Siemens Hausgeräte GmbH, 81739 Food product preparing method, involves bringing food product between two array elements of cooking appliance, where gaseous atmosphere present between food product and one array element is changed into physical parameter in defined manner

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EP0105174B1 (en) 1987-04-15
DE3233069A1 (en) 1984-03-08
DE3371025D1 (en) 1987-05-21

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