EP0718577A2 - Resistance heated electric furnace - Google Patents

Resistance heated electric furnace Download PDF

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Publication number
EP0718577A2
EP0718577A2 EP95120112A EP95120112A EP0718577A2 EP 0718577 A2 EP0718577 A2 EP 0718577A2 EP 95120112 A EP95120112 A EP 95120112A EP 95120112 A EP95120112 A EP 95120112A EP 0718577 A2 EP0718577 A2 EP 0718577A2
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EP
European Patent Office
Prior art keywords
opening
deglor
edge
ceiling
protective tube
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Granted
Application number
EP95120112A
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German (de)
French (fr)
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EP0718577B1 (en
EP0718577A3 (en
Inventor
Helge Dr. Jansen
Ludwig Dr. Weiler
Christian Dr. Wieckert
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Alstom KK
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ABB KK
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Publication of EP0718577A3 publication Critical patent/EP0718577A3/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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • 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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating

Definitions

  • the invention relates to a deglor furnace according to the preamble of claim 1.
  • Deglor ovens are used for the glazing of ashes from waste incineration plants. Contaminants contained in the ashes are evaporated and separated. The glazed components can be used as building materials or deposited. Deglor ovens operate at temperatures between 1300 ° C and 1500 ° C. For this purpose, each deglor oven is provided with heating elements in its ceiling area. The heating elements are surrounded on the outside by a protective tube made of ceramic, which is permanently closed at one end and has a detachable closure at the second end.
  • a deglor furnace is known from German patent application P 4328718.2, in which the ceramic protective tube has a flange at its open end, which flange is formed by a metal clamp.
  • the clamp is attached to the outer surface of the protective tube by means of one or more screws.
  • a U-shaped heating element is arranged inside the protective tube. Its electrical connections are led through the removable closure to the outside.
  • the flange attached to the open end of the protective tube is placed on the surface of the deglor oven and serves as a holder for the heating element.
  • the protective tube is led into the interior of the deglor oven through an opening in the ceiling. The opening is immediately limited by the thermal insulation of the ceiling.
  • the invention has for its object to show a deglor furnace in which the disadvantages described above are eliminated.
  • the opening and its edge areas are provided with a shield.
  • the shield has a gastight ceramic cylinder. The entire inner surface of the opening is lined with this.
  • the cylinder is connected with a refractory cement to the insulating bricks that delimit the inner surface of the opening.
  • the edge of the opening facing the interior of the deglor furnace is covered by one or more plates made of refractory bricks.
  • the inner lining of the deglor furnace is also made from these panels. The plates are arranged so that they directly adjoin the protective tube of the heating element, so that the penetration of the gas from the interior into the opening is largely prevented.
  • the outward-facing edge of the opening is covered by a ring-shaped plate made of stainless steel, which also partially lies on the surface of the ceiling. Between this plate 13 and the edge of the ceramic cylinder, a seal made of fibers is arranged. This seal is designed as a mat. However, cords with the same properties can also be used.
  • the dimensions of the plate are chosen so that they directly adjoin the protective tube of the heating element.
  • the heating element is held on the surface of the plate.
  • the protective tube of the heating element is provided with an outward-facing flange which is placed on this plate. Due to the weight of the protective tube, the plate is pressed against the opening and the cylinder lining the opening, as a result of which an additional sealing of the deglor furnace to the outside is achieved.
  • the only figure belonging to the description shows a section of a deglor furnace 1.
  • the ceiling 2 consists of two or more layers of insulating stones 2I, which serve as thermal insulation. These are preferably made of oxide ceramic.
  • the deglor furnace 1 is heated by a large number of heating elements 3, one of which is shown in the figure.
  • Each of these heating elements 3 has a heating rod 6, which is arranged in a ceramic protective tube 4.
  • the protective tube 4 is permanently closed at its first end 4A, while its second end 4B has a detachable cover 4D. This can be removed in order to replace the heating element 6 by another if the former is defective.
  • the electrical connections 6A of the heating element 6 are led out of the protective tube 4 through the cover 4D.
  • the protective tube 4 is provided at its second end 4B with an outwardly facing flange 4F. This consists of a clamp that is attached to the outside of the protective tube 4 by means of screws 4S. This flange 4F serves to hold the heating element 3 on the surface 2S of the ceiling 2.
  • the protective tube 4 is passed through an opening 10 which is continuous from the surface 2S of the deglor furnace 1 to its interior 1R.
  • the protective tube 4 projects into the interior 1R with its first end 4A and about a third of its length. So that no corrosive gases 30 can get from the interior 1R to the insulating stones 2I of the ceiling 2 and to the outside, the opening 10 and its inner and outer edge regions 10A and 10I are surrounded by a shield 11.
  • the shield 11 comprises a cylinder 12 made of ceramic, an annular plate 13 made of stainless steel and one or more plates 14 made of refractory stones.
  • the plates 14 are arranged on the underside of the ceiling 2, that the inwardly facing edge 10I of the opening 10 of these Plates 14 is covered.
  • the cylinder 12 made of ceramic 12 belonging to the shield 11 is dimensioned such that its outer surface directly adjoins the insulating blocks 2I.
  • the cylinder 12 is made of Al203, mullite, MgAl2O4 or another refractory material with the same properties. It is connected to the insulating stones 2I via a refractory cement 16.
  • the refractory cement is one based on Al203 which binds hydraulically.
  • the edge 12I of the cylinder 12 facing the interior 1R is placed on the immediately adjacent plates 14. Since the plates 14 are guided up to the protective tube 4 of the heating element 3, this creates a step on which the cylinder 12 with its edge 12I can be placed. Between the edge 12I of the cylinder 12 and the plates 14, a seal 15 made of fibers is arranged, which is designed as a mat or cord. This creates a further protection of the insulating stones 2I against the corrosive gases 30. On the outwardly facing edge 10A of the opening 10 and the edge 12A of the cylinder 12, the annular plate 13 made of stainless steel is placed, which is directly adjacent to the protective tube 4. The plate 13 also lies on the surface 2S of the ceiling 2.
  • One or more fiber seals 17 are arranged between the plate 13 and the edge 10A of the opening, the edge 12A of the cylinder 12 and the surface 2S of the ceiling 2. These seals 17 are designed as mats. Lines with equivalent properties can also be used as seals. With the help of the seals 17 is prevented that gases 30 can escape from the deglor furnace 1 to the outside.
  • the heating element 3 is mounted on the surface of the plate 13 in such a way that the flange 4F, which surrounds the protective tube 4, is placed on the plate 13. Due to the weight of the protective tube 4, the plate 13 is pressed against the cylinder 12 and the edge 10A of the opening 10, so that a further sealing of the deglor furnace 1 is thereby achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Furnace Details (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Gasification And Melting Of Waste (AREA)

Abstract

The kiln to vitrify ash material from a rubbish incinerator, using electrical resistance heating, has a shrouding (11) for the thermal insulation (21) of the cover (2), at least at the opening (10) for protection against the corrosive gases (30) from the interior (1R). The shrouding (11) has at least one gas-tight cylinder (12) of ceramic, e.g. Al2O3, mullite, MgAl2O4, bonded hydraulically by a fireproof cement (16) with an Al2O3 base.

Description

Die Erfindung bezieht sich auf einen Deglorofen gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a deglor furnace according to the preamble of claim 1.

Degloröfen werden für die Verglasung von Asche aus Müllverbrennungsanlagen benutzt. In der Asche enthaltene Verunreinigungen werden verdampft und abgetrennt. Die verglasten Bestandteile können als Baumaterialien verwendet oder deponiert werden. Degloröfen arbeiten bei Temperaturen zwischen 1300°C und 1500°C. Zu diesem Zweck ist jeder Deglorofen in seinem Deckenbereich mit Heizelementen versehen. Die Heizelemente sind nach außen hin von einem Schutzrohr aus Keramik umgeben, das an einem Ende dauerhaft geschlossen und am zweiten Ende einen lösbaren Verschluß aufweist.Deglor ovens are used for the glazing of ashes from waste incineration plants. Contaminants contained in the ashes are evaporated and separated. The glazed components can be used as building materials or deposited. Deglor ovens operate at temperatures between 1300 ° C and 1500 ° C. For this purpose, each deglor oven is provided with heating elements in its ceiling area. The heating elements are surrounded on the outside by a protective tube made of ceramic, which is permanently closed at one end and has a detachable closure at the second end.

Aus der deutschen Patentanmeldung P 4328718.2 ist ein Deglorofen bekannt, bei dem das keramische Schutzrohr an seinem offenen Ende einen Flansch aufweist, der durch eine Schelle aus Metall gebildet wird. Die Schelle ist mittels einer oder mehrerer Schrauben an der Außenfläche des Schutzrohres befestigt. Innerhalb des Schutzrohres ist ein U-förmiger Heizstab angeordnet. Seine elektrischen Anschlüssen sind durch den lösbaren Verschluß hindurch nach außen geführt. Der am offenen Ende des Schutzrohres befestigte Flansch ist auf die Oberfläche des Deglorofens aufgesetzt, und dient als Halterung für das Heizelement. Das Schutzrohr ist über eine Öffnung in der Decke in den Innenraum des Deglorofens geführt. Die Öffnung wird unmittelbar von der Wärmeisolation der Decke begrenzt. Dieses ist von Nachteil, da hierdurch Gase aus dem Deglorofen entlang der Außenflächen des Schutzrohres zu der feuerfesten Wärmeisolation der Decke gelangen können. Dieses ist insbesondere dann der Fall, wenn während einer pulsartigen Abreinigung des Abgasfilters der Druck im Deglorofen kurzzeitig ansteigt. Die Gase und ihre Kondensate wirken stark korrodierend und zerstören die Wärmeisolation sehr schnell.A deglor furnace is known from German patent application P 4328718.2, in which the ceramic protective tube has a flange at its open end, which flange is formed by a metal clamp. The clamp is attached to the outer surface of the protective tube by means of one or more screws. A U-shaped heating element is arranged inside the protective tube. Its electrical connections are led through the removable closure to the outside. The flange attached to the open end of the protective tube is placed on the surface of the deglor oven and serves as a holder for the heating element. The protective tube is led into the interior of the deglor oven through an opening in the ceiling. The opening is immediately limited by the thermal insulation of the ceiling. This is disadvantageous, since gases from the deglor furnace along the outer surfaces of the protective tube can reach the fire-proof heat insulation of the ceiling. This is particularly the case if the pressure in the deglor furnace rises briefly during a pulse-like cleaning of the exhaust gas filter. The gases and their condensates are highly corrosive and destroy the thermal insulation very quickly.

Der Erfindung liegt die Aufgabe zugrunde, einen Deglorofen aufzuzeigen, bei dem die obenbeschriebenen Nachteile beseitigt sind.The invention has for its object to show a deglor furnace in which the disadvantages described above are eliminated.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruches 1 gelöst.This object is achieved by the features of claim 1.

Damit die korrosiven Gase aus dem Innenraum des Deglorofens nicht über die Öffnung bis zu den die Wärmeisolation bildenden Isoliersteinen der Decke vordringen können, sind die Öffnung und ihre Randbereiche mit einer Abschirmung versehen. Erfindungsgemäß weist die Abschirmung einen gasdichten Zylinder aus Keramik auf. Damit ist die-gesamte Innenfläche der Öffnung ausgekleidet. Der Zylinder ist mit-einem feuerfesten Zement mit den Isoliersteinen verbunden, welche die Innenfläche der Öffnung begrenzen. Der dem Innenraum des Deglorofens zugewandte Rand der Öffnung ist von einer oder mehreren Platten aus feuerfesten Steinen überdeckt. Aus diesen Platten ist auch die innere Ausmauerung des Deglorofen gefertigt. Die Platten sind so angeordnet, sie unmittelbar an das Schutzrohr des Heizelementes angrenzen, so daß hierdurch das Eindringen des Gases aus dem Innenraum in die Öffnung weitgehend verhindert wird. Der nach außen weisende Rand der Öffnung ist von einer ringförmige Platte aus Edelstahl überdeckt, die auch teilweise auf der Oberfläche der Decke aufliegt. Zwischen dieser Platte 13 und dem Rand des Zylinders aus Keramik ist eine Dichtung aus Fasern angeordnet. Diese Dichtung ist als Matte ausgebildet. Es können jedoch auch Schnüre mit den gleichen Eigenschaften verwendet werden. Die Abmessungen der Platte sind so gewählt, daß diese unmittelbar an das Schutzrohr des Heizelementes angrenzt. Auf der Oberfläche der Platte wird das Heizelement gehalten. Hierfür ist das Schutzrohr des Heizelementes mit einem nach außen weisenden Flansch versehen, der auf diese Platte aufgesetzt ist. Durch das Gewicht des Schutzrohrs wird die Platte gegen die Öffnung und den die Öffnung auskleidenden Zylinder gedrückt, wodurch eine zusätzliche Abdichtung des Deglorofens nach außen erreicht wird.So that the corrosive gases from the interior of the deglor furnace cannot penetrate through the opening to the insulating stones of the ceiling that form the thermal insulation, the opening and its edge areas are provided with a shield. According to the invention, the shield has a gastight ceramic cylinder. The entire inner surface of the opening is lined with this. The cylinder is connected with a refractory cement to the insulating bricks that delimit the inner surface of the opening. The edge of the opening facing the interior of the deglor furnace is covered by one or more plates made of refractory bricks. The inner lining of the deglor furnace is also made from these panels. The plates are arranged so that they directly adjoin the protective tube of the heating element, so that the penetration of the gas from the interior into the opening is largely prevented. The outward-facing edge of the opening is covered by a ring-shaped plate made of stainless steel, which also partially lies on the surface of the ceiling. Between this plate 13 and the edge of the ceramic cylinder, a seal made of fibers is arranged. This seal is designed as a mat. However, cords with the same properties can also be used. The dimensions of the plate are chosen so that they directly adjoin the protective tube of the heating element. The heating element is held on the surface of the plate. For this purpose, the protective tube of the heating element is provided with an outward-facing flange which is placed on this plate. Due to the weight of the protective tube, the plate is pressed against the opening and the cylinder lining the opening, as a result of which an additional sealing of the deglor furnace to the outside is achieved.

Weitere erfindungswesentliche Merkmale sind in den Unteransprüchen gekennzeichnet.Further features essential to the invention are characterized in the subclaims.

Die Erfindung wird nachfolgend anhand einer schematischen Zeichnung näher erläutert.The invention is explained in more detail below with the aid of a schematic drawing.

Die einzige zur Beschreibung gehörige Fig. zeigt einen Ausschnitt aus einen Deglorofen 1. Wie der Fig. zu entnehmen ist, besteht die Decke 2 aus zwei oder mehreren Lagen von Isoliersteinen 2I, welche als Wärmeisolation dienen. Diese sind vorzugsweise aus oxidischer Keramik gefertigt. Die Heizung des Deglorofens 1 erfolgt über eine Vielzahl von Heizelemente 3, von denen eines in der Fig. dargestellt ist. Jedes dieser Heizelemente 3 weist einen Heizstab 6 auf, der in einem keramischen Schutzrohr 4 angeordnet ist. Das Schutzrohr 4 ist an seinem ersten Ende 4A dauerhaft verschlossen, während sein zweites Ende 4B einen lösbaren Deckel 4D aufweist. Dieser kann abgenommen werden, um den Heizstab 6 durch einen anderen zu ersetzen, wenn ersterer defekt ist. Die elektrischen Anschlüsse 6A des Heizstabes 6 sind aus dem Schutzrohr 4 durch den Deckel 4D hindurch nach außen geführt. Das Schutzrohr 4 ist an seinem zweiten Ende 4B mit einem nach außen weisenden Flansch 4F versehen. Dieser besteht aus einer Schelle, die über Schrauben 4S auf der Außenseite des Schutzrohres 4 befestigt ist. Dieser Flansch 4F dient zur Halterung des Heizelements 3 auf der Oberfläche 2S der Decke 2. Das Schutzrohr 4 ist durch eine Öffnung 10 hindurchgeführt, die von der Oberfläche 2S des Deglorofens 1 bis in dessen Innenraum 1R durchgängig ist. Das Schutzrohr 4 ragt mit seinem ersten Ende 4A und etwa einem Drittel seiner Länge in den Innenraum 1R. Damit über die Öffnung 10 keine korrosiven Gase 30 aus dem Innenraum 1R zu den Isoliersteinen 2I der Decke 2 und nach außen gelangen können, sind die Öffnung 10 und ihre inneren und äußeren Randbereiche 10A und 10I von einer Abschirmung 11 umgeben. Die Abschirmung 11 umfaßt einen Zylinder 12 aus Keramik, eine ringförmige Platte 13 aus Edelstahl sowie eine oder mehrere Platten 14 aus feuerfesten Steinen. Die Platten 14 sind so an der Unterseite der Decke 2 angeordnet, das der nach innen weisende Rand 10I der Öffnung 10 von diesen Platten 14 überdeckt wird. Der zur Abschirmung 11 gehörende Zylinder 12 aus Keramik 12 ist so bemessen, daß er mit seiner Außenfläche unmittelbar an die Isoliersteine 2I angrenzt. Der Zylinder 12 ist aus Al₂0₃, Mullit, MgAl₂O₄ oder einem anderen feuerfesten Werkstoff mit den gleichen Eigenschaften hergestellt. Er ist über einen feuerfesten Zement 16 mit den Isoliersteinen 2I verbunden. Bei dem feuerfesten Zement handelt es sich um einen solchen auf der Basis von Al₂0₃ der hydraulisch bindet. Der dem Innenraum 1R zugewandte Rand 12I des Zylinder 12 ist auf die unmittelbar angrenzenden Platten 14 aufgesetzt. Da die Platten 14 bis zu dem Schutzrohr 4 des Heizelement 3 geführt sind, wird hierdurch ein-Absatz geschaffen, auf den der Zylinder 12 mit seinem Rand 12I aufgesetzt werden kann. Zwischen dem Rand 12I des Zylinders 12 und den Platten 14 ist eine Dichtung 15 aus Fasern angeordnet, die als Matte oder Schnur ausgebildet ist. Hierdurch wird ein weiterer Schutz der Isoliersteine 2I gegen die korrosiven Gase 30 geschaffen. Auf den nach außen weisenden Rand 10A der Öffnung 10 und den Rand 12A des Zylinder 12 ist die ringförmige Platte 13 aus Edelstahl aufgelegt, die unmittelbar an das Schutzrohr 4 angrenzt. Die Platte 13 liegt zudem auf der Oberfläche 2S der Decke 2 auf. Zwischen der Platte 13 und dem Rand 10A der Öffnung, dem Rand 12A des Zylinder 12 und der Oberfläche 2S der Decke 2 sind eine oder mehrere Dichtungen 17 aus Fasern angeordnet. Diese Dichtungen 17 sind als Matten ausgebildet. Schnüre mit gleichwertigen Eigenschaften können auch als Dichtungen verwendet werden. Mit Hilfe der Dichtungen 17 wird verhindert, daß Gase 30 aus dem Deglorofen 1 nach außen gelangen können. Auf die Oberfläche der Platte 13 ist das Heizelement 3 gehaltert, und zwar in der Weise, daß der Flansch 4F, der das Schutzrohr 4 umgibt auf die Platte 13 aufgesetzt ist. Durch das Gewicht des Schutzrohres 4 wird die Platte 13 gegen den Zylinder 12 und den Rand 10A der Öffnung 10 gepreßt, so daß hierdurch eine weitere Abdichtung des Deglorofens 1 erreicht wird.The only figure belonging to the description shows a section of a deglor furnace 1. As can be seen from the figure, the ceiling 2 consists of two or more layers of insulating stones 2I, which serve as thermal insulation. These are preferably made of oxide ceramic. The deglor furnace 1 is heated by a large number of heating elements 3, one of which is shown in the figure. Each of these heating elements 3 has a heating rod 6, which is arranged in a ceramic protective tube 4. The protective tube 4 is permanently closed at its first end 4A, while its second end 4B has a detachable cover 4D. This can be removed in order to replace the heating element 6 by another if the former is defective. The electrical connections 6A of the heating element 6 are led out of the protective tube 4 through the cover 4D. The protective tube 4 is provided at its second end 4B with an outwardly facing flange 4F. This consists of a clamp that is attached to the outside of the protective tube 4 by means of screws 4S. This flange 4F serves to hold the heating element 3 on the surface 2S of the ceiling 2. The protective tube 4 is passed through an opening 10 which is continuous from the surface 2S of the deglor furnace 1 to its interior 1R. The protective tube 4 projects into the interior 1R with its first end 4A and about a third of its length. So that no corrosive gases 30 can get from the interior 1R to the insulating stones 2I of the ceiling 2 and to the outside, the opening 10 and its inner and outer edge regions 10A and 10I are surrounded by a shield 11. The shield 11 comprises a cylinder 12 made of ceramic, an annular plate 13 made of stainless steel and one or more plates 14 made of refractory stones. The plates 14 are arranged on the underside of the ceiling 2, that the inwardly facing edge 10I of the opening 10 of these Plates 14 is covered. The cylinder 12 made of ceramic 12 belonging to the shield 11 is dimensioned such that its outer surface directly adjoins the insulating blocks 2I. The cylinder 12 is made of Al₂0₃, mullite, MgAl₂O₄ or another refractory material with the same properties. It is connected to the insulating stones 2I via a refractory cement 16. The refractory cement is one based on Al₂0₃ which binds hydraulically. The edge 12I of the cylinder 12 facing the interior 1R is placed on the immediately adjacent plates 14. Since the plates 14 are guided up to the protective tube 4 of the heating element 3, this creates a step on which the cylinder 12 with its edge 12I can be placed. Between the edge 12I of the cylinder 12 and the plates 14, a seal 15 made of fibers is arranged, which is designed as a mat or cord. This creates a further protection of the insulating stones 2I against the corrosive gases 30. On the outwardly facing edge 10A of the opening 10 and the edge 12A of the cylinder 12, the annular plate 13 made of stainless steel is placed, which is directly adjacent to the protective tube 4. The plate 13 also lies on the surface 2S of the ceiling 2. One or more fiber seals 17 are arranged between the plate 13 and the edge 10A of the opening, the edge 12A of the cylinder 12 and the surface 2S of the ceiling 2. These seals 17 are designed as mats. Lines with equivalent properties can also be used as seals. With the help of the seals 17 is prevented that gases 30 can escape from the deglor furnace 1 to the outside. The heating element 3 is mounted on the surface of the plate 13 in such a way that the flange 4F, which surrounds the protective tube 4, is placed on the plate 13. Due to the weight of the protective tube 4, the plate 13 is pressed against the cylinder 12 and the edge 10A of the opening 10, so that a further sealing of the deglor furnace 1 is thereby achieved.

Claims (8)

Deglorofen mit mindestens einem Heizelement (3), dessen Heizstab (6) von einem Schutzrohr (4) umgeben ist, das durch eine Öffnung (10) in der Decke (2) in den Innenraum (1R) geführt ist, wobei das Schutzrohr (4) mit seinem Flansch (4F) auf die Oberfläche (2S) der Decke (2) aufgesetzt ist , dadurch gekennzeichnet, daß die Wärmeisolation (2I) der Decke (2) durch eine Abschirmung (11), die wenigstens im Bereich der Öffnung (10) angeordnet ist, gegen die korrosiven Gase (30) aus dem Innenraum (1R) geschützt ist.Deglor oven with at least one heating element (3), the heating element (6) of which is surrounded by a protective tube (4) which is guided through an opening (10) in the ceiling (2) into the interior (1R), the protective tube (4 ) with its flange (4F) on the surface (2S) of the ceiling (2), characterized in that the thermal insulation (2I) of the ceiling (2) by a shield (11), at least in the area of the opening (10 ) is arranged against the corrosive gases (30) from the interior (1R) is protected. Deglorofen nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Abschirmung (11) wenigstens einen gasdichten Zylinder (12) umfaßt, mit dem die Innenfläche der Öffnung (10) ausgekleidet ist, sowie Abdeckungen (13,14), die in den Randbereichen (10A, 10I) der Öffnung (10) vorgesehen sind.Deglor oven according to one of claims 1 or 2, characterized in that the shield (11) comprises at least one gas-tight cylinder (12) with which the inner surface of the opening (10) is lined, and covers (13, 14) which are in the Edge areas (10A, 10I) of the opening (10) are provided. Deglorofen nach einem der Ansprüche 1 oder 2 , dadurch gekennzeichnet, daß der Zylinder (12) aus Keramik in Form Al₂0₃, Mullit, MgAl₂O₄ gefertigt und mit einem feuerfesten Zement (16) auf der Basis von Al₂0₃, der hydraulisch bindet, dauerhaft mit der Innenfläche der Öffnung (10) verbunden ist, die durch die Wärmeisolation (2I) der Decke (2) begrenzt ist.Deglor furnace according to one of claims 1 or 2, characterized in that the cylinder (12) made of ceramic in the form of Al₂0₃, mullite, MgAl₂O₄ and with a refractory cement (16) based on Al₂0₃, which binds hydraulically, permanently with the inner surface the opening (10) is connected, which is limited by the thermal insulation (2I) of the ceiling (2). Deglorofen nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der dem Innenraum (1R) zugewandte Rand (10I) der Öffnung (10) durch eine oder mehrere korrosionsbeständige Platten (14) aus feuerfesten Steinen überdeckt ist, daß die Platten (14) bis zum Schutzrohr (4) des Heizelementes (3) geführt sind, und daß der nach innen weisende Rand (12I) des Zylinder (12) auf dem Rand der Platten (14) unter Zwischenfügen einer Dichtung (15) aufgesetzt ist.Deglor oven according to one of claims 1 to 3, characterized in that the edge (10I) of the opening (10) facing the interior (1R) is covered by one or more corrosion-resistant plates (14) made of refractory stones, that the plates (14) to the protective tube (4) of the heating element (3), and that the inwardly facing edge (12I) of the cylinder (12) is placed on the edge of the plates (14) with the interposition of a seal (15). Deglorofen nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Platten (14) gleichzeitig als Ofenausmauerung vorgesehen ist.Deglor furnace according to one of claims 1 to 4, characterized in that the plates (14) are simultaneously provided as furnace lining. Deglorofen nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der nach außen weisende Rand (10A) der Öffnung (10) sowie der Rand (12A) des Zylinder (12) von einer Platte (13) aus Edelstahl überdeckt ist, daß die Platte (13) auch teilweise auf der Oberfläche (2S) der Decke (2) aufliegt, und daß zwischen der Platte (13) und dem Rand (10A) der Öffnung (10), dem Rand (12A) des Zylinder (12) und der Oberfläche (2S) der Decke (2) wenigstens eine Dichtung (17) angeordnet ist.Deglor oven according to one of claims 1 to 5, characterized in that the outwardly facing edge (10A) of the opening (10) and the edge (12A) of the cylinder (12) are covered by a plate (13) made of stainless steel, that the Plate (13) also partially on the surface (2S) of the ceiling (2), and that between the plate (13) and the edge (10A) of the opening (10), the edge (12A) of the cylinder (12) and at least one seal (17) is arranged on the surface (2S) of the ceiling (2). Deglorofen nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Dichtungen (15 und 17) als Matten aus Fasern oder als Schnüre ausgebildet sind.Deglor oven according to one of claims 1 to 6, characterized in that the seals (15 and 17) are designed as mats made of fibers or as cords. Deglorofen nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Schutzrohr (4) mit seinem Flansch (4F) auf die Oberfläche der Platte (13) aus Edelstahl aufgesetzt ist.Deglor oven according to one of claims 1 to 7, characterized in that the protective tube (4) with its flange (4F) is placed on the surface of the stainless steel plate (13).
EP95120112A 1994-12-24 1995-12-19 Resistance heated electric furnace Expired - Lifetime EP0718577B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4446530A DE4446530A1 (en) 1994-12-24 1994-12-24 Deglorofen
DE4446530 1994-12-24

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EP0718577A2 true EP0718577A2 (en) 1996-06-26
EP0718577A3 EP0718577A3 (en) 1997-06-04
EP0718577B1 EP0718577B1 (en) 1999-12-22

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19960879A1 (en) * 1999-12-17 2001-07-12 Abb Patent Gmbh Test facility
DE10237759A1 (en) * 2002-08-17 2004-02-26 Sms Demag Ag Electrode and method for arranging it in electric arc furnaces
US20080130704A1 (en) * 2006-11-30 2008-06-05 Lapoint Albert E Electroslag smelting system and method

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE717668C (en) * 1937-06-12 1942-02-20 Siemens Planiawerke Ag Electric furnace with electric resistance heating elements
GB909031A (en) * 1958-01-22 1962-10-24 Wild Barfield Electr Furnaces Improvements in electric heating elements for furnaces
FR1393081A (en) * 1964-05-12 1965-03-19 Morganite Thermal Designs Ltd Electric furnace, especially for melting metals
DE2854943A1 (en) * 1977-12-23 1979-06-28 Alco Standard Corp HEATING DEVICE WITH SHIELD GAS SYSTEM
US4179603A (en) * 1977-11-21 1979-12-18 The Electric Furnace Company Radial blade heating device
US5120027A (en) * 1991-04-26 1992-06-09 Union Carbide Industrial Gases Technology Corporation Heater arrangement for aluminum refining systems
JPH0699054A (en) * 1992-09-24 1994-04-12 Mitsubishi Heavy Ind Ltd Treatment of car shredder dust combustion ash
FR2699038A1 (en) * 1992-12-08 1994-06-10 Electricite De France Immersible electric heating rod for molten metals, etc. - has sealed tubular container with disposable protective sheath covering section near molten surface.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2735881A (en) * 1956-02-21 Metal-impregnated heating rods for electric
US1662555A (en) * 1926-12-18 1928-03-13 Wojciechowski Edward Universal bottle heater
US3009974A (en) * 1958-04-26 1961-11-21 Ingenior Gunnar Schjelderup In Electric furnace
US4056678A (en) * 1976-02-20 1977-11-01 Sola Basic Industries, Inc. Electric heating furnace
US4080510A (en) * 1976-11-18 1978-03-21 Btu Engineering Corporation Silicon carbide heater
US4259538A (en) * 1980-01-31 1981-03-31 Jones William R Vacuum furnace arrangement having an improved heating element mounting means
US4379382A (en) * 1980-06-02 1983-04-12 Sauder Industries, Inc. Method and apparatus for insulating a furnace having a corrosive atmosphere
DE4328718A1 (en) * 1993-08-26 1995-03-02 Abb Gadelius K K Heating element

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE717668C (en) * 1937-06-12 1942-02-20 Siemens Planiawerke Ag Electric furnace with electric resistance heating elements
GB909031A (en) * 1958-01-22 1962-10-24 Wild Barfield Electr Furnaces Improvements in electric heating elements for furnaces
FR1393081A (en) * 1964-05-12 1965-03-19 Morganite Thermal Designs Ltd Electric furnace, especially for melting metals
US4179603A (en) * 1977-11-21 1979-12-18 The Electric Furnace Company Radial blade heating device
DE2854943A1 (en) * 1977-12-23 1979-06-28 Alco Standard Corp HEATING DEVICE WITH SHIELD GAS SYSTEM
US5120027A (en) * 1991-04-26 1992-06-09 Union Carbide Industrial Gases Technology Corporation Heater arrangement for aluminum refining systems
JPH0699054A (en) * 1992-09-24 1994-04-12 Mitsubishi Heavy Ind Ltd Treatment of car shredder dust combustion ash
FR2699038A1 (en) * 1992-12-08 1994-06-10 Electricite De France Immersible electric heating rod for molten metals, etc. - has sealed tubular container with disposable protective sheath covering section near molten surface.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 018, no. 371 (C-1224), 13.Juli 1994 & JP 06 099054 A (MITSUBISHI HEAVY IND LTD;OTHERS: 01), 12.April 1994, *

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DE59507480D1 (en) 2000-01-27
EP0718577B1 (en) 1999-12-22
DE4446530A1 (en) 1996-06-27
US5809056A (en) 1998-09-15
EP0718577A3 (en) 1997-06-04
JPH08210620A (en) 1996-08-20

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