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EP0608591A1 - Process and installation for running a double furnace plant - Google Patents

Process and installation for running a double furnace plant Download PDF

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Publication number
EP0608591A1
EP0608591A1 EP93250356A EP93250356A EP0608591A1 EP 0608591 A1 EP0608591 A1 EP 0608591A1 EP 93250356 A EP93250356 A EP 93250356A EP 93250356 A EP93250356 A EP 93250356A EP 0608591 A1 EP0608591 A1 EP 0608591A1
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EP
European Patent Office
Prior art keywords
furnace
gas
double
flue gas
vessel
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.)
Granted
Application number
EP93250356A
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German (de)
French (fr)
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EP0608591B1 (en
Inventor
Hans-Ludwig Schaller
Horst Mellinghoff
Michael Schmengler
Uwe Mager
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Vodafone GmbH
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Mannesmann AG
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Publication date
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Publication of EP0608591A1 publication Critical patent/EP0608591A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace

Definitions

  • the invention relates to a steelworks plant with a double furnace device and a method for operating this plant according to the preambles of claims 1, 7 and 13.
  • Such a device is known from the document DE-PS 33 07 400, in which the warm exhaust gases from an arc furnace can be connected to the basket through a feed line, flow through the scrap in the basket and thereby heat up, in order to then be fed to a gas cleaning system will.
  • the invention has therefore set itself the goal of avoiding the disadvantages mentioned above and using structurally simple components to create a low-maintenance and yet reliable steelworks system with a double furnace device and to specify the associated method for melting steel in an environmentally friendly and energy-saving manner.
  • two ovens are connected by a line opening in the lower region of the upper vessel.
  • the ovens are electrically switched so that only one oven is in operation at a time, while the second is completely disconnected from the mains.
  • This furnace which is separated from the power supply, is filled with Möller, largely sealed with a lid and connected to the dedusting system via the flue gas elbow in the lid.
  • a pressure increase is provided in the line between the furnace and the dedusting system, which generates a negative pressure when operated in the currentless furnace.
  • the gas is withdrawn from the furnace filled with Möller, the flue gas being sucked off through the connecting line to the furnace in operation.
  • the flue gas manifold which is also present, is shut off in the furnace in operation, so that the supply air is taken up essentially from the area of the sealing line between the lid and the vessel.
  • the path of the gas is thus from the area above the furnace of the furnace in operation through the scrap column above the melt level via the connecting line to the neighboring furnace, where it flows diagonally through the furnace and thereby releases the heat to the scrap and above the column of fuel through the Flue gas duct finally to the gas cleaning system and from there to the outside. Except the one with fittings No connecting components are required. There is no unnecessary loss of thermal energy, since the Möller remains directly in the vessel by being melted down later.
  • the connecting line represents a structurally simple, low-maintenance component.
  • the shut-off elements used are not subject to any particular loads and have proven themselves in practice.
  • the connecting line In the case of tiltable furnace vessels, the connecting line will have a radial separation in the middle. This separation can be closed gas-tight by a sliding sleeve.
  • the mouth of the connecting line can be arranged in a special embodiment in the lower vessel, which is designed in the form of a pocket.
  • This bag has the advantage that it does not hinder the pillar of furniture and that it also protects the mouth of the connecting line from damage from scrap parts.
  • Natural gas and / or oil are additionally used to substitute electrical energy and to shorten the tap to tap time.
  • Oxygen burner installed. The efficiency of these burners becomes less and less depending on their switch-on time, since these mostly rigidly arranged burners only burn a more or less large hole in the scrap.
  • the hot combustion gases escape unused into the gas cleaning system. In the proposed double furnace, however, these gases can be used directly for further heating the electrically non-operated furnace.
  • FIG. 1 shows the ovens 10 and 20 with the lower parts 11, 21 and the upper parts 12, 22, which can be closed by covers 13, 24.
  • Flue gas lines 14, 24 are connected to the covers 13, 23 and lead to an afterburner 31 for gas cleaning 30.
  • Barriers 53, 54 and sliding sleeves 62, 63 in the further course of the line are provided in the flue gas lines 14, 24.
  • the furnaces 10 and 11 are connected via connecting lines 15, 25 which have a sliding sleeve 61 at the top of the separation T.
  • the connecting lines 15, 25 also have barriers 51 and 52, respectively.
  • a supply air line 29 is provided on the cover 23 of the furnace 20 and can be closed by a shut-off 57.
  • a burner 93 projects into the upper part 12 of the furnace 10 and leads to a supply station 91 of the additional burner device 90 via a feed line.
  • a pressure increase blower 34 is provided in the main gas guide 32, which is preceded by a shut-off 55, the part of the main gas guide 32 having the pressure increase blower 34 and the shut-off 55 is bypassed by a bypass line 33 which has a shut-off 56.
  • Electrodes 17, 27 protrude into the furnaces 10, 20.
  • Bottom electrodes 18, 28 are arranged in the vessel lower parts 11, 21.
  • the electrodes 17, 27 designed as cathodes are connected via a cathode feed line 72 to a transformer 73 of a power supply 70.
  • the bottom electrodes 18, 28 designed as anodes are connected to the transformer 73 via an anode line 78.
  • the current supply lines 72, 78 have the furnace switches to the cathode 81, 82 and to the anode furnace switches 83, 84, and the tyristors 74, 75 and the chokes 76, 77.
  • a flue gas discharge line 59 is also shown, which has a compressor 39 and a shutoff 58.
  • media 40 are listed for the respective lines, namely flue gas 43, burned gas 44 and clean gas 45.
  • FIG. 2 in which the identical positions as in FIG. 1 are used, shows the furnaces 10 and 20 in section.
  • the Möller 41 and the molten steel 42 are shown in more detail, while simultaneously showing the direction of flow of the gas.
  • the furnace 20 is in the melting phase, the furnace 10 is freshly charged and is connected to the furnace 20 in terms of gas flow.
  • the possibility is shown in detail of arranging a pocket 16 on the lower part 11 of the vessel, which enables the connecting line 15 to be attached easily without obstructing the pillar of furniture 41.
  • the upper vessel of the furnace 20 is cylindrical as usual, with a grille 19 being provided to prevent Möller 41 from flowing into the connecting line 25.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Manufacture Of Iron (AREA)
  • Tunnel Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention relates to a steel works installation with a double-furnace plant and to a process for operating this installation. The process is intended for melting steel in an energy-saving manner without pollution of the environment. For this purpose, it is characterised by the following steps: one of the two furnaces is supplied with electric power for melting the charge present therein and the other is completely separated from the mains; the furnace which has been taken off from the power mains and tapped is charged with charge material; the furnace vessel is then sealed by a cover; subsequently the gas present in the vessel space is extracted above the column of charge; the flue gas from the furnace in electric operation is extracted from the furnace separated from the power mains via a connecting line provided between the two furnaces, the flue gas connection of the other furnace to the gas purification being broken during the extraction of the flue gas from the furnace separated from the power mains; and at the same time added air is taken up in the region of the cover of the furnace which is in electric operation. This double-furnace installation is designed according to the invention in a special manner. <IMAGE>

Description

Die Erfindung betrifft eine Stahlwerksanlage mit einer Doppelofeneinrichtung und ein Verfahren zum Betreiben dieser Anlage nach den Oberbegriffen der Ansprüche 1, 7 und 13.The invention relates to a steelworks plant with a double furnace device and a method for operating this plant according to the preambles of claims 1, 7 and 13.

Bei der sich verschärfenden Knappheit der Ressourcen an Energie und an Material gibt es eine Reine von Vorschlägen, die Stahlerzeugung kostengünstig und möglichst umweltfreundlich zu gestalten. Hierzu zählen die bekannten Maßnahmen, aus dem Elektropfen abgezogene Ofengase zur Vorwärmung des Chargiergutes zu benutzen. Üblicherweise wird dabei zur Vorwärmung des Chargiergutes, insbesondere des Schrottes, dieser in einem Cargierkorb vorgewärmt.Given the increasing scarcity of resources in terms of energy and materials, there are a number of suggestions for making steel production inexpensive and as environmentally friendly as possible. These include the known measures to use furnace gases drawn off from the electric droplets to preheat the charging material. Usually, to preheat the cargo, in particular the scrap, it is preheated in a cargo basket.

Aus der Schrift DE-PS 33 07 400 ist eine solche Vorrichtung bekannt, bei der die warmen Abgase eines Lichtbogenofens durch eine Zuleitung mit dem Korb in Verbindung gebracht werden können, den im Korb befindlichen Schrott durchströmen und dabei aufneizen, um anschließend einer Gasreinigungsanlage zugeführt zu werden.Such a device is known from the document DE-PS 33 07 400, in which the warm exhaust gases from an arc furnace can be connected to the basket through a feed line, flow through the scrap in the basket and thereby heat up, in order to then be fed to a gas cleaning system will.

Aus der DE-PS 35 21 569 ist wiederum ein Verfahren bekannt, bei dem der mit Schrott gefüllte Korb in einen Vorwärmofen eingebracht wird. Dieser Vorwärmofen wird mit Vorwärmgas belegt, das über einen Wärmetauscher erhitzt wird. Durch den Wärmetauscher wird das aus einem Elektropfen abgezogene Ofengas auf seinen Weg zur Entstaubungsanlage geführt.From DE-PS 35 21 569, in turn, a method is known in which the basket filled with scrap is introduced into a preheating furnace. This preheating furnace is filled with preheating gas, which is heated by a heat exchanger. The furnace gas extracted from an electric drop is guided through the heat exchanger on its way to the dedusting system.

Die Gegenstände beider genannter Schriften erfordern hohen Konstruktiven Aufwand und eine Fülle von wartungsintensiven Bauteilen. Darüber hinaus ist durch das mehrfache Umfüllen des Chargiergutes in verschiedene Gefäße eine Minderung der Energieausnutzung der Rauchgase zu verzeichnen.The subjects of both of the above-mentioned documents require a high level of design effort and an abundance of maintenance-intensive components. In addition, due to the multiple transfer of the cargo into different vessels, there is a reduction in the energy utilization of the flue gases.

Beim Einsatz von mehr als einem Ofen sind Vorschläge bekannt, die Anzahl zum Ofen gehörenden Baugruppen zu vermindern. So ist aus der DE-PS 32 25 514 bekannt, bei einem Lichtbogendoppelherdofen für beide Ofenherde einen gemeinsamen schwenkbaren Deckel, der alternativ auf einen der beiden Herde aufsetzbar ist, vorzusehen. Diese kompliziert aufgebaute und empfindliche Vorrichtung erfordert nicht nur hohen Instandhaltungsaufwand, sondern führt immer wieder zu Behinderungen des Produktionsbetriebes.When using more than one furnace, proposals are known to reduce the number of assemblies belonging to the furnace. For example, it is known from DE-PS 32 25 514 to provide a common pivoting cover for an electric double-hearth oven for both oven stoves, which can alternatively be placed on one of the two stoves. This complicated and sensitive device not only requires a high level of maintenance, but always leads to disabilities in the production operation.

Die Erfindung hat sich daher das Ziel gesetzt, die oben genannten Nachteile zu vermeiden und bei Verwendung konstruktiv einfacher Bauteile eine wartungsarme und dabei betriebssichere Stahlwerksanlage mit einer Doppelofeneinrichtung zu schaffen und das dazu gehörende Verfahren anzugeben, umweltschonend und energiesparend Stahl zu erschmelzen.The invention has therefore set itself the goal of avoiding the disadvantages mentioned above and using structurally simple components to create a low-maintenance and yet reliable steelworks system with a double furnace device and to specify the associated method for melting steel in an environmentally friendly and energy-saving manner.

Die Erfindung erreicht dieses Ziel durch die kennzeichnenden Merkmale der Ansprüche 1, 7 und 13.The invention achieves this aim by the characterizing features of claims 1, 7 and 13.

Erfindungsgemäß werden zwei Öfen durch eine im unteren Bereich des Obergefäßes mündende Leitung verbunden. Die Öfen werden elektrisch so geschaltet, daß immer nur ein Ofen in Betrieb ist, während der zweite vollständig vom Netz getrennt ist. Dieser vom Stromnetz getrennte Ofen wird mit Möller gefüllt, mittels eines Deckels weitgehend dicht abgeschlossen und durch den im Deckel vorhandenen Rauchgaskrümmer mit der Entstaubungsanlage leitungsmäßig verbunden. In der Leitung zwischen Ofen und Entstaubungsanlage ist eine Druckerhöhung vorgesehen, die bei Betrieb im stromlosen Ofen einen Unterdruck erzeugt. Hierdurch wird das Gas aus dem mit Möller gefüllten Ofen abgezogen, wobei durch die Verbindungsleitung mit dem sich in Betrieb befindlichen Ofen aus diesem Rauchgas abgesaugt wird. Gleichzeitig wird bei dem sich im Betrieb befindenden Ofen der ebenfalls vorhandene Rauchgaskrümmer abgesperrt, so daß die Zuluft im wesentlichen aus dem Bereich der Dichtlinie zwischen Deckel und Gefäß aufgenommen wird. Der Weg des Gases ist somit von dem Bereich oberhalb des Möllers des in Betrieb befindlichen Ofens durch die Schrottsäule hindurch oberhalb des Schmelzenspiegels über die Verbindungsleitung zum Nachbarofen, dort diagonal durch den Ofen strömend und dabei die Wärme an den Schrott abgebend und oberhalb der Möllersäule durch den Rauchgaskanal endgültig zur Gasreinigungsanlage und von dort ins Freie. Außer der mit Armaturen versehenen Verbindungsleitung sind keinerlei Bauteile erforderlich. Ein unnötiger Verlust von Wärmeenergie tritt nicht ein, da der Möller unmittelbar im Gefäß verbleibt, indem er später eingeschmolzen wird.According to the invention, two ovens are connected by a line opening in the lower region of the upper vessel. The ovens are electrically switched so that only one oven is in operation at a time, while the second is completely disconnected from the mains. This furnace, which is separated from the power supply, is filled with Möller, largely sealed with a lid and connected to the dedusting system via the flue gas elbow in the lid. A pressure increase is provided in the line between the furnace and the dedusting system, which generates a negative pressure when operated in the currentless furnace. As a result, the gas is withdrawn from the furnace filled with Möller, the flue gas being sucked off through the connecting line to the furnace in operation. At the same time, the flue gas manifold, which is also present, is shut off in the furnace in operation, so that the supply air is taken up essentially from the area of the sealing line between the lid and the vessel. The path of the gas is thus from the area above the furnace of the furnace in operation through the scrap column above the melt level via the connecting line to the neighboring furnace, where it flows diagonally through the furnace and thereby releases the heat to the scrap and above the column of fuel through the Flue gas duct finally to the gas cleaning system and from there to the outside. Except the one with fittings No connecting components are required. There is no unnecessary loss of thermal energy, since the Möller remains directly in the vessel by being melted down later.

Die Verbindungsleitung stellt dabei ein konstruktiv einfaches, wartungsarmes Bauteil dar. Die zum Einsatz kommenden Absperrelemente unterliegen keinen besonderen Belastungen und haben sich in der Praxis bewährt.The connecting line represents a structurally simple, low-maintenance component. The shut-off elements used are not subject to any particular loads and have proven themselves in practice.

Bei kippbaren Ofengefäßen wird die Verbindungsleitung in ihrer Mitte eine radiale Trennung aufweisen. Diese Trennung ist durch eine Schiebemuffe gasdicht verschließbar.In the case of tiltable furnace vessels, the connecting line will have a radial separation in the middle. This separation can be closed gas-tight by a sliding sleeve.

Die Mündung der Verbindungsleitung kann in einer besonderen Ausgestaltung im Untergefäß angeordnet sein, daß dabei in Form einer Tasche ausgebildet ist. Diese Tasche hat zum einen den Vorteil, daß sie die Möllersäule nicht behindert und daß sie darüber hinaus die Mündung der Verbindungsleitung vor Beschädigungen durch Schrottteile schützt. Zur Substituierung elektrischer Energie und zur Verkürzung der tap to tap-Zeit werden zusätzlich Erdgas- und/oder Öl-. Sauerstoff-Brenner installiert. Der Wirkungsgrad dieser Brenner wird in Abhängigkeit ihrer Einschaltzeit immer geringer, da diese meist starr angeordneten Brenner lediglich ein mehr oder weniger großes Loch in den Schrott brennen. Die heißen Verbrennungsgase entweichen ungenutzt in die Gasreinigungsanlage. Beim vorgeschlagenen Doppelofen können jedoch diese Gase direkt zum weiteren Erwärmen des elektrisch nicht betriebenen Ofens genutzt werden. Dadurch kann der Wirkungsgrad dieser Brenner erhöht, bzw. die Einschaltzeit der Brenner sinnvoll verlängert werden.
Die Zufuhr an Energie mit nur einer elektrischen Hauptleitung, die im Bereich der Öfen eigene durch schaltertrennbare Leitungen aufweist sowie auch der Einsatz von zwei Deckeln verläßt deutlich den bisher beschrittenen Weg. Erfindungsgemäß kommen robuste, bewährte äußerst wartungsarme Bauteile zum Einsatz, die in dem rauhen Stahlwerksbetrieb in kürzester Zeit kostengünstiger und betriebssicherer arbeiten als der Weg, mit einem beweglichen Deckel und einer damit zusammenhängenden elektrischen Leitung beide Öfen zu bedienen.The mouth of the connecting line can be arranged in a special embodiment in the lower vessel, which is designed in the form of a pocket. This bag has the advantage that it does not hinder the pillar of furniture and that it also protects the mouth of the connecting line from damage from scrap parts. Natural gas and / or oil are additionally used to substitute electrical energy and to shorten the tap to tap time. Oxygen burner installed. The efficiency of these burners becomes less and less depending on their switch-on time, since these mostly rigidly arranged burners only burn a more or less large hole in the scrap. The hot combustion gases escape unused into the gas cleaning system. In the proposed double furnace, however, these gases can be used directly for further heating the electrically non-operated furnace. As a result, the efficiency of these burners can be increased or the switch-on time of the burners can be extended.
The supply of energy with only one electrical main line, which has its own switch-disconnectable lines in the area of the furnaces as well The use of two lids also clearly leaves the path previously followed. According to the invention, robust, tried and tested, extremely low-maintenance components are used, which in the rough steelworks work in a very short time are more cost-effective and reliable than the way to operate both furnaces with a movable cover and a related electrical line.

Die Erfindung ist in der Zeichnung dargelegt. Es zeigen die

Fig. 1
das Schema der Doppelofenanlage
Fig. 2
das Gasfließbild während des Ofenbetriebes
The invention is shown in the drawing. They show
Fig. 1
the scheme of the double furnace system
Fig. 2
the gas flow diagram during furnace operation

Die Figur 1 zeigt die Öfen 10 und 20 mit den Gefäßunterteilen 11, 21 und den Gefäßoberteilen 12, 22, die durch Deckel 13, 24 verschließbar sind. An die Deckel 13, 23 sind Rauchgasleitungen 14, 24 angeschlossen, die zu einem Nachbrenner 31 einer Gasreinigung 30 führen. In den Rauchgasleitungen 14, 24 sind Absperrungen 53, 54 sowie im weiteren Verlauf der Leitung Schiebemuffen 62, 63 vorgesehen.FIG. 1 shows the ovens 10 and 20 with the lower parts 11, 21 and the upper parts 12, 22, which can be closed by covers 13, 24. Flue gas lines 14, 24 are connected to the covers 13, 23 and lead to an afterburner 31 for gas cleaning 30. Barriers 53, 54 and sliding sleeves 62, 63 in the further course of the line are provided in the flue gas lines 14, 24.

Die Öfen 10 und 11 sind über Verbindungsleitungen 15, 25, welche kopfendig an der Trennung T eine Schiebemuffe 61 aufweisen. Die Verbindungsleitungen 15, 25 besitzen darüber hinaus Absperrungen 51 bzw. 52.The furnaces 10 and 11 are connected via connecting lines 15, 25 which have a sliding sleeve 61 at the top of the separation T. The connecting lines 15, 25 also have barriers 51 and 52, respectively.

Am Deckel 23 des Ofens 20 ist eine Zuluftleitung 29 vorgesehen, die durch eine Absperrung 57 verschießbar ist.A supply air line 29 is provided on the cover 23 of the furnace 20 and can be closed by a shut-off 57.

In das Gefäßoberteil 12 des Ofens 10 ragt ein Brenner 93, der über eine Zuleitung zu einer Versorgungsstation 91 der Zusatzbrennereinrichtung 90 führt.A burner 93 projects into the upper part 12 of the furnace 10 and leads to a supply station 91 of the additional burner device 90 via a feed line.

Der über die Rauchgasleitungen 14, 24 mit den Öfen 10, 20 verbundene Nachbrenner 31 weist eine Hauptgasführung 32 auf, die mit einem Filter 35 in Verbindung steht, an den eine an Sauger 36 aufweisende und mit einem Kamin 38 verbundene Gasleitung 37 angeschlossen ist. In der Hauptgasführung 32 ist ein Druckerhöhungsgebläse 34 vorgesehen, dem eine Absperrung 55 vorgeschaltet ist, der das Druckerhöhungsgebläse 34 und die Absperrung 55 aufweisende Teil der Hauptgasführung 32 wird von einer Umgehungsleitung 33 umgangen, die eine Absperrung 56 aufweist.The afterburner 31, which is connected to the furnaces 10, 20 via the flue gas lines 14, 24, has a main gas duct 32, which is connected to a filter 35, to which a gas line 37 having a suction device 36 and a chimney 38 is connected. A pressure increase blower 34 is provided in the main gas guide 32, which is preceded by a shut-off 55, the part of the main gas guide 32 having the pressure increase blower 34 and the shut-off 55 is bypassed by a bypass line 33 which has a shut-off 56.

In die Öfen 10, 20 ragen Elektroden 17, 27. In den Gefäßunterteilen 11, 21 sind Bodenelektroden 18, 28 angeordnet.
Die als Kathode ausgebildeten Elektroden 17, 27 sind über eine Kathodenzuleitung 72 mit einem Transformator 73 einer Stromversorgung 70 verbunden. Die als Anoden ausgebildeten Bodenelektroden 18, 28 sind über eine Anodenleitung 78 mit dem Transformator 73 verbunden. Die Stromzuleitungen 72, 78 weisen dabei die Ofenschalter zur Kathode 81, 82 und zur Anode Ofenschalter 83, 84, sowie die Tyristoren 74, 75 und die Drosseln 76, 77 auf.Electrodes 17, 27 protrude into the furnaces 10, 20. Bottom electrodes 18, 28 are arranged in the vessel lower parts 11, 21.
The electrodes 17, 27 designed as cathodes are connected via a cathode feed line 72 to a transformer 73 of a power supply 70. The bottom electrodes 18, 28 designed as anodes are connected to the transformer 73 via an anode line 78. The current supply lines 72, 78 have the furnace switches to the cathode 81, 82 and to the anode furnace switches 83, 84, and the tyristors 74, 75 and the chokes 76, 77.

Am Deckel 23 des Ofens 20 ist noch eine Rauchgasabführleitung 59 dargestellt, die einen Verdichter 39 sowie eine Absperrung 58 aufweist.On the cover 23 of the furnace 20, a flue gas discharge line 59 is also shown, which has a compressor 39 and a shutoff 58.

Darüber hinaus sind die Medien 40 bei den jeweiligen Leitungen aufgeführt, und zwar Rauchgas 43, verbranntes Gas 44 und Reingas 45.In addition, the media 40 are listed for the respective lines, namely flue gas 43, burned gas 44 and clean gas 45.

Die Figur 2, bei der die identischen Positionen wie in der Figur 1 verwendet werden, zeigt im Schnitt die Öfen 10 und 20. Detaillierter ist der Möller 41 und die Stahlschmelze 42 dargestellt bei gleichzeitigem Aufzeigen der Strömungsrichtung des Gases. In der Figur 2 befindet sich der Ofen 20 in der Schmelzphase, der Ofen 10 ist frisch chargiert und gasströmungsmäßig mit dem Ofen 20 verbunden.FIG. 2, in which the identical positions as in FIG. 1 are used, shows the furnaces 10 and 20 in section. The Möller 41 and the molten steel 42 are shown in more detail, while simultaneously showing the direction of flow of the gas. In FIG. 2, the furnace 20 is in the melting phase, the furnace 10 is freshly charged and is connected to the furnace 20 in terms of gas flow.

Außerdem ist im Detail die Möglichkeit aufgezeigt, am Gefäßunterteil 11 eine Tasche 16 anzuordnen, die ein einfaches Anbringen der Verbindungsleitung 15 ermöglicht, ohne die Möllersäule 41 zu behindern. Im Vergleich dazu ist beim Ofen 20 das Obergefäß wie üblich zylindrisch ausgestaltet, wobei zur Verhinderung des Hineinfließens von Möller 41 in die Verbindungsleitung 25 ein Gitter 19 vorgesehen ist.In addition, the possibility is shown in detail of arranging a pocket 16 on the lower part 11 of the vessel, which enables the connecting line 15 to be attached easily without obstructing the pillar of furniture 41. In comparison with this, the upper vessel of the furnace 20 is cylindrical as usual, with a grille 19 being provided to prevent Möller 41 from flowing into the connecting line 25.

PositionslistePosition list

1010th
Ofen 1Oven 1
1111
GefäßunterteilLower part of the vessel
1212th
GefäßoberteilUpper part of the vessel
1313
Deckelcover
1414
RauchgasFlue gas
1515
VerbindungsleitungConnecting line
1616
Taschebag
1717th
Elektrode (Katode)Electrode (cathode)
1818th
Bodenelektrode (Anode)Bottom electrode (anode)
1919th
GitterGrid
2020th
Ofen 2Oven 2
2121
GefäßunterteilLower part of the vessel
2222
GefäßoberteilUpper part of the vessel
2323
Deckelcover
2424th
RauchgasFlue gas
2525th
VerbindungsleitungConnecting line
2626
Taschebag
2727
Elektrode (Katode)Electrode (cathode)
2828
Bodenelektrode (Anode)Bottom electrode (anode)
2929
ZuluftleitungSupply air line
3030th
GasreinigungGas cleaning
3131
NachbrennerAfterburner
3232
HauptgasführungMain gas flow
3333
Umgehungbypass
3434
DruckerhöhungsgebläseBooster blower
3535
Filterfilter
3636
SaugerMammal
3737
GasleitungGas pipe
3838
Kaminstack
3939
Verdichter Verbranntes GasCompressor burned gas
4040
Medienmedia
4141
MöllerMoller
4242
StahlschmelzeMelting steel
4343
RauchgasFlue gas
4444
Verbranntes GasBurnt gas
4545
ReingasClean gas
5050
ArmaturenFittings
5151
Absperrung Verbindungsleitung Ofen 1Shut-off connecting line furnace 1
5252
Absperrung Verbindungsleitung Ofen 2Shut-off connection pipe furnace 2
5353
Absperrung Rauchgasofen 1Shut off flue gas oven 1
5454
Absperrung Rauchgasofen 2Shut off flue gas oven 2
5555
Absperrung GasleitungShutdown gas line
5656
Absperrung UmgehungBarrier bypass
5757
Absperrung ZuluftShut off supply air
5858
Absperrung Verbranntes GasBarrier burned gas
5959
Leitung verbranntes GasLine burned gas
6060
TrennungsverschlußSeparation lock
6161
Schiebemuffe VerbindungsleitungSliding sleeve connecting line
6262
Schiebemuffe Rauchgasofen 2Sliding sleeve flue gas oven 2
6363
Schiebemuffe Rauchgasofen 1Sliding sleeve smoke gas oven 1
7070
StromversorgungPower supply
7171
HauptstromzufuhrMain power supply
7272
KathodenleitungCathode lead
7373
Transformatortransformer
7474
TyristorTyristor
7575
Tyristor 1Tyristor 1
7676
Drossel 2Throttle 2
7777
Drossel 1Throttle 1
7878
AnodenleitungAnode lead
8080
Elektrische SchaltelementeElectrical switching elements
8181
Kathodenschalter Ofen 1Cathode switch furnace 1
8282
Kathodenschalter Ofen 2Oven 2 cathode switch
8383
Anodenschalter Ofen 1Anode switch furnace 1
8484
Anodenschalter Ofen 2Anode switch furnace 2
8585
Netzschalter T8Power switch T8
9090
ZusatzbrennereinrichtungAdditional burner device
9191
VersorgungsstationSupply station
9292
ZuleitungSupply
9393
Brennerburner
TT
Trennungseparation

Claims (14)

Verfahren zum Betreiben einer Zweiofenanlage, insbesondere zur Stahlerzeugung, mit über eine Leitung in Verbindung stehenden Lichtbogenöfen und Einrichtungen zur Materialbeschickung, zum Gasabzug und zur Gasreinigung sowie zur Stromzufuhr, wobei einer der beiden Öfen zum Einschmelzen der darin befindlichen Charge mit elektrischem Strom versorgt und der andere vollständig vom Netz getrennt wird, der vom Stromnetz genommene und abgestochene Ofen mit Beschickungsmaterial, insbesondere Schrott, chargiert und anschließend das Ofengefäß mit einem Deckel verschlossen wird, gekennzeichnet durch folgende Schritte: a) nach Verschließen des vom Stromnetz genommenen Ofens wird das im Gefäßraum befindliche Gas oberhalb der Möllersäule abgesaugt, b) über die zwischen beiden Öfen vorgesehene Verbindungsleitung wird das Rauchgas aus dem im elektrischen Betrieb befindlichen Ofen oberhalb des Schmelzspiegels durch den vom Stromnetz getrennten Ofen abgesaugt, wobei c) während des Absaugens des Rauchgases aus dem vom Stromnetz getrennten Ofen die Rauchgasverbindung des anderen Ofens zur Gasreinigung unterbrochen wird, und d) gleichzeitig Zuluft im Bereich des Deckels des im elektrischen Betrieb befindlichen Ofens aufgenommen wird. Method for operating a two-furnace system, in particular for steel production, with arc furnaces connected via a line and devices for feeding material, for gas extraction and gas purification and for supplying electricity, one of the two furnaces supplying electrical current for melting down the batch therein and the other completely disconnected from the mains, the furnace removed and tapped from the mains is charged with feed material, in particular scrap, and the furnace vessel is then closed with a lid, characterized by the following steps: a) after the furnace has been removed from the power supply, the gas in the vessel space above the column of furniture is extracted, b) via the connecting line provided between the two furnaces, the flue gas is sucked out of the furnace in electrical operation above the melting level through the furnace separated from the power supply, whereby c) during the extraction of the flue gas from the furnace separated from the mains, the flue gas connection of the other furnace for gas cleaning is interrupted, and d) at the same time supply air is taken up in the area of the cover of the furnace in electrical operation. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Rauchgase bei dem vom Netz genommenen Ofen die Möllersäule entgegender Chargierrichtung durchströmen.Method according to claim 1,
characterized,
that the flue gases flow through the furnace counter to the charging direction when the furnace is removed from the network. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Gase des in Betrieb befindlichen Ofens den Möller in Chargierrichtung durchströmen.Method according to claim 1,
characterized,
that the gases from the furnace in operation flow through the Möller in the charging direction. Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß den Gasen mengenmäßig einstellbar Zuluft zugeführt wird.Method according to claim 3,
characterized,
that the supply air is adjustable in quantity. Verfahren nach Anspruch 4,
dadurch gekennzeichnet,
daß ein Teil der in einer Nachbrennkammer verbrannten Rauchgase abgezweigt und als Zuluft eingesetzt wird.Method according to claim 4,
characterized,
that part of the flue gases burned in an afterburner is branched off and used as supply air. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß der Möller des im elektrischen Betrieb befindlichen Ofens durch Brennstoffe zusätzlich erwärmt wird.Method according to claim 1,
characterized,
that the burner of the furnace in electrical operation is additionally heated by fuels. Doppelofeneinrichtung mit zwei Ofengefäßen, die durch Deckel verschließbar sind, welche über Rauchgaskrümmer mit einer Gasreinigungsanlage in Verbindung stehen und deren Ofenobergefäße über eine Leitung miteinander verbunden sind, zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Verbindungsleitung (15, 25) eine radiale Trennung (T) aufweist, die eine radiale Bewegung der Mündungen der Verbindungsleitungen (15, 25) zuläßt,
daß die Trennung (T) gasdicht verschließbar ist,
daß die Verbindungsleitungen (15, 25) beiderseits der Trennung (T) je eine Absperrvorrichtung (51, 52) aufweisen.Double furnace device with two furnace vessels, which can be closed by lids, which are connected to a gas cleaning system via flue gas manifolds and whose furnace top vessels are connected to one another via a line, for carrying out the method according to one of Claims 1 to 5,
characterized,
that the connecting line (15, 25) has a radial separation (T) which permits radial movement of the mouths of the connecting lines (15, 25),
that the separation (T) can be closed gas-tight,
that the connecting lines (15, 25) on both sides of the separation (T) each have a shut-off device (51, 52). Doppelofeneinrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß zum Verschließen der Trennung (T) eine Schiebemuffe (61) eingesetzt wird.Double furnace device according to claim 7,
characterized,
that a sliding sleeve (61) is used to close the partition (T). Doppelofeneinrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß der Anschluß der Verbindungsleitungen (15, 25) in dem den Gefäßunterteilen (11, 21) zugeneigten Bereich der Gefäßoberteile (12, 22) mündet.Double furnace device according to claim 7,
characterized,
that the connection of the connecting lines (15, 25) opens into the area of the upper vessel parts (12, 22) inclined towards the lower vessel parts (11, 21). Doppelofeneinrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß der Anschluß der Verbindungsleitungen (15, 25) in einem als Tasche (16, 26) ausgebildeten Bereich der Gefäßoberteile (12, 22) mündet.Double furnace device according to claim 7,
characterized,
that the connection of the connecting lines (15, 25) opens into an area of the vessel upper parts (12, 22) designed as a pocket (16, 26). Doppelofeneinrichtung nach den Ansprüchen 9 oder 10,
dadurch gekennzeichnet,
daß die Mündung der Verbindungsleitungen (15, 25) an dem Außenrand der Gefäßteile (11, 12 oder 21, 22) diagonal zur Mündung der Rauchgaskrümmer (14, 24) der auf den Gefäßen aufsetzbaren Deckeln (13, 23) angeordnet ist.Double furnace device according to claims 9 or 10,
characterized,
that the mouth of the connecting lines (15, 25) on the outer edge of the vessel parts (11, 12 or 21, 22) is arranged diagonally to the mouth of the flue gas manifolds (14, 24) of the covers (13, 23) which can be placed on the vessels. Doppelofeneinrichtung nach Anspruch 7,
dadurch gekennzeichnet,
daß in das Ofenkopfoberteil (12) an eine Brennenergieversorgungsstation (91) angeschlossene Brenner (93) ragen.Double furnace device according to claim 7,
characterized,
that burners (93) project into the furnace head part (12) connected to a combustion energy supply station (91). Stahlwerksanlage mit einer Stromversorgung und einer an eine Gasreingigungsanlage angeschlossene Doppelofereinrichtung nach einem der Ansprüche 7 bis 12 und zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
daß elektrische Schaltelemente (81, 82) vorgesehen sind, die bei nur einer Hauptstromzufuhr (71) bei völliger elektrischer Trennung des einen Ofens (10 oder 20) den ungehinderten Betrieb des anderen Ofens (20 oder 10) ermöglichen.Steel plant with a power supply and a double furnace device connected to a gas cleaning system according to one of claims 7 to 12 and for carrying out the method according to one of claims 1 to 6,
characterized,
that electrical switching elements (81, 82) are provided which, with only one main power supply (71) and complete electrical isolation of one furnace (10 or 20), enable unimpeded operation of the other furnace (20 or 10). Stahlwerksanlage nach Anspruch 12,
dadurch gekennzeichnet,
daß bei einer Gleichstromversorgung die einzelnen Öfen (10, 20) zusätzlich Schalter (83, 84) zur elektrischen Trennung der Anoden (18, 28) vom Strom aufweisen.Steel plant according to claim 12,
characterized,
that in the case of a direct current supply, the individual furnaces (10, 20) additionally have switches (83, 84) for the electrical separation of the anodes (18, 28) from the current.
EP93250356A 1993-01-25 1993-12-21 Process and installation for running a double furnace plant Expired - Lifetime EP0608591B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4302285 1993-01-25
DE4302285A DE4302285C3 (en) 1993-01-25 1993-01-25 Method and device for operating a two-furnace system

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EP0608591A1 true EP0608591A1 (en) 1994-08-03
EP0608591B1 EP0608591B1 (en) 1997-02-26

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EP (1) EP0608591B1 (en)
JP (1) JPH0749179A (en)
CN (1) CN1038260C (en)
AT (1) ATE149209T1 (en)
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DE (2) DE4302285C3 (en)

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US5905752A (en) * 1996-07-15 1999-05-18 Amsted Industries Incorporated ARC furnace fume collection system and method
ITBS970088A1 (en) * 1997-10-29 1999-04-29 Natale Bonometti STEEL PRODUCTION METHOD
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JP2000017306A (en) * 1998-07-02 2000-01-18 Shimazu Mekutemu Kk Degreasing sintering furnace
US6081545A (en) * 1998-09-21 2000-06-27 Amsted Industries Incorporated ARC furnace improved fume collection
EP1126039B1 (en) * 2000-02-17 2007-02-14 John A. Vallomy Method for reductively processing the liquid slag and the baghouse dust of the electric arc furnace
CN107208974A (en) * 2015-01-27 2017-09-26 杰富意钢铁株式会社 Method of making molten iron by electric furnace
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CN1038260C (en) 1998-05-06
ATE149209T1 (en) 1997-03-15
DE4302285A1 (en) 1994-07-28
US5499264A (en) 1996-03-12
DE4302285C3 (en) 1998-07-09
JPH0749179A (en) 1995-02-21
BR9400314A (en) 1994-08-16
DE4302285C2 (en) 1994-11-03
CN1091777A (en) 1994-09-07
EP0608591B1 (en) 1997-02-26

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