DE4447414A1 - Electrically heated radiant heater tube for industrial oven - Google Patents
Electrically heated radiant heater tube for industrial ovenInfo
- Publication number
- DE4447414A1 DE4447414A1 DE19944447414 DE4447414A DE4447414A1 DE 4447414 A1 DE4447414 A1 DE 4447414A1 DE 19944447414 DE19944447414 DE 19944447414 DE 4447414 A DE4447414 A DE 4447414A DE 4447414 A1 DE4447414 A1 DE 4447414A1
- Authority
- DE
- Germany
- Prior art keywords
- electrically heated
- jet pipe
- graphite
- protective gas
- heating
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0006—Electric heating elements or system
- F27D2099/0008—Resistor heating
- F27D2099/0011—The resistor heats a radiant tube or surface
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
Description
Die Verwendung von Strahlrohren zur Beheizung von Industrieöfen ist bekannt und immer dann erforderlich, wenn die eigentliche Wärmequelle gegenüber der Ofenatmosphäre getrennt werden muß. In solchen Fällen wird die Wärmequelle, im allgemeinen Brenngase oder metallische Heizleiterdrähte, in ein gegenüber dem Behandlungsraum und damit auch gegenüber der Ofenatmosphäre allseitig dichtes Mantelrohr eingeschlossen.The use of radiant tubes for heating industrial furnaces is known and required whenever the actual heat source compared to the furnace atmosphere must be separated. In such cases, the heat source, generally fuel gases or metallic heating wire, in one opposite the treatment room and thus also opposite sealed tubular casing on all sides of the furnace atmosphere.
In Vakuumöfen werden als elektrische Heizleiter auch Graphitelemente mit gutem Erfolg eingesetzt. Der Vorteil der Graphitheizung gegenüber Heizdrähten ist die viel höhere Temperaturbelastbarkeit. Ihr Nachteil ist die äußerst große Empfindlichkeit gegenüber Sauerstoff und damit Luft vor allem bei Temperaturen über 400°C.Graphite elements are also used as electrical heating conductors in vacuum furnaces used with good success. The advantage of graphite heating compared to heating wires is the much higher temperature resistance. Your disadvantage is the extremely large Sensitivity to oxygen and thus air especially at temperatures above 400 ° C.
In Vakuumöfen werden die Graphitheizleiter jedoch mit Niederspannung betrieben, um elektrische Überschläge durch Glimmentladungen zu vermeiden. Das macht wiederum die Nutzung aufwendiger Trafos und die Verlegung entsprechend groß dimensionierter Leitungsquerschnitte sowie gegebenenfalls eine Kühlung an Wanddurchführungen etc. erforderlich.In vacuum furnaces, however, the graphite heating conductors are made with low voltage operated to electrical flashovers Avoid glow discharges. That in turn makes the usage elaborate transformers and the laying accordingly large dimensioned wire cross-sections and if necessary cooling on wall bushings etc. is required.
Werden dagegen die Heizelemente aus Graphit in Mantelrohre eingeschlossen, wie in Anspruch 1 dieser Anmeldung zugrunde gelegt; dann können zum Beispiel bei Nutzung von Stickstoff als Schutzgas die Heizelemente in einer Atmosphäre bei höherem Druck, zum Beispiel bei Normaldruck aber auch bei Überdruck, auch ohne Zwischenschaltung von Trafos direkt mit Netzspannung betrieben werden.In contrast, the heating elements made of graphite in jacket pipes included as in claim 1 of this application placed; then, for example, when using nitrogen as a protective gas, the heating elements in an atmosphere at higher Pressure, for example at normal pressure but also at overpressure, even without the interposition of transformers Mains voltage are operated.
Der Betrieb mit Überdruck oder sogar mit Wasserstoff als Schutzgas ist vor allem bei niedrigeren Temperaturen ein Vorteil, da dann die Wärme vom Heizleiter zum Mantelrohr zusätzlich zur Strahlung auch durch intensivierte Thermik übertragen werden kann.Operation with overpressure or even with hydrogen as Shielding gas is especially a low temperature Advantage, because then the heat from the heating conductor to the jacket tube in addition to radiation also through intensified thermals can be transferred.
Je nach Betriebsart kann es wünschenswert sein, den Gasaustausch in den Mantelrohren zwischen Luft und Schutzgas über den Umweg einer dazwischen geschalteten Evakuierung zu beschleunigen oder den Verbrauch an Schutzgas durch diese Maßnahme zu reduzieren.Depending on the operating mode, it may be desirable to exchange gas in the jacket pipes between air and protective gas the detour to an intermediate evacuation accelerate or the consumption of protective gas through this Measure to reduce.
Ein wesentlicher Vorteil der Verwendung von Graphitheizleitern im Sinne vorstehender Darlegungen gegenüber der bisher üblichen Verwendung metallischer Heizleiter liegt darin, daß infolge der bedeutend höheren, zulässigen Oberflächentemperaturen am Graphit in einem gegebenen Mantelrohr eine mindestens doppelt so hohe Heizleistung installiert werden kann. Auch kann das Gewicht der Strahlrohre durch den Fortfall der keramischen Heizwendelträger und durch den Fortfall des Gewichtes der metallischen Heizleiter selbst deutlich verringert werden. Damit könnten gegebenenfalls dünnwandigere Mantelrohre eingesetzt werden.A major advantage of using graphite heating conductors in the sense of the above statements compared to the previous The usual use of metallic heating conductors is that due to the significantly higher permissible surface temperatures at least on the graphite in a given jacket tube twice the heating power can be installed. The weight of the jet pipes can also be reduced by the loss of the ceramic heating coil carrier and by the elimination of the Weight of the metallic heating conductor itself significantly reduced will. This could possibly be used with thin walls Jacket pipes are used.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944447414 DE4447414A1 (en) | 1994-12-02 | 1994-12-02 | Electrically heated radiant heater tube for industrial oven |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19944447414 DE4447414A1 (en) | 1994-12-02 | 1994-12-02 | Electrically heated radiant heater tube for industrial oven |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4447414A1 true DE4447414A1 (en) | 1996-06-05 |
Family
ID=6537609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19944447414 Withdrawn DE4447414A1 (en) | 1994-12-02 | 1994-12-02 | Electrically heated radiant heater tube for industrial oven |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4447414A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016009293A1 (en) | 2016-08-02 | 2018-02-08 | Vdeh-Betriebsforschungsinstitut Gmbh | Apparatus for indirect heating of a heat treatment process in an industrial plant, controller for the operation of such apparatus, system comprising such apparatus and control, method for indirectly heating a chamber and use of an apparatus for indirect heating of a heat treatment process in an industrial plant |
-
1994
- 1994-12-02 DE DE19944447414 patent/DE4447414A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016009293A1 (en) | 2016-08-02 | 2018-02-08 | Vdeh-Betriebsforschungsinstitut Gmbh | Apparatus for indirect heating of a heat treatment process in an industrial plant, controller for the operation of such apparatus, system comprising such apparatus and control, method for indirectly heating a chamber and use of an apparatus for indirect heating of a heat treatment process in an industrial plant |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8139 | Disposal/non-payment of the annual fee |