EP0608591B1 - Process and installation for running a double furnace plant - Google Patents
Process and installation for running a double furnace plant Download PDFInfo
- Publication number
- EP0608591B1 EP0608591B1 EP93250356A EP93250356A EP0608591B1 EP 0608591 B1 EP0608591 B1 EP 0608591B1 EP 93250356 A EP93250356 A EP 93250356A EP 93250356 A EP93250356 A EP 93250356A EP 0608591 B1 EP0608591 B1 EP 0608591B1
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- EP
- European Patent Office
- Prior art keywords
- furnace
- gas
- flue gas
- vessel
- installation
- 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.)
- Expired - Lifetime
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Classifications
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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; Tank furnaces
- F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; 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 and 5.
- 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.
- DE-A-3 232 139 discloses a steel melting plant for operating a two-furnace system, in which the electric furnaces are connected to one another via a line.
- the gases are extracted from the furnace in operation through the cover.
- the gas line opens into the furnace casing in the lower jacket area, so that the hot gases rise through the material to be melted in this furnace before they are fed to the dedusting device.
- FR-A-2 259 907 a two-furnace system is known in which the furnaces are connected by a line. The edge gases from the furnace in operation flow horizontally through the batch in the other furnace before they are discharged.
- 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 the charge material, and the flue gas is sucked out of the flue gas 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 charge material 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 charge column 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 charge 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 charge 41 and the molten steel 42 are shown in greater detail, while the direction of flow of the gas is shown at the same time.
- 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 is customary, a grid 19 being provided to prevent the charge 41 from flowing into the connecting line 25.
Abstract
Description
Die Erfindung betrifft eine Stahlwerksanlage mit einer Doppelofeneinrichtung und ein Verfahren zum Betreiben dieser Anlage nach den Oberbegriffen der Ansprüche 1 und 5.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 and 5.
Bei der sich verschärfenden Knappheit der Ressourcen an Energie und an Material gibt es eine Reihe von Vorschlägen, die Stahlerzeugung kostengünstig und möglichst umweltfreundlich zu gestalten. Hierzu zählen die bekannten Maßnahmen, aus dem Elektroofen abgezogene Ofengase zur Vorwärmung des Chargiergutes zu benutzen. Üblicherweise wird dabei zur Vorwärmung des Chargiergutes, insbesondere des Schrottes, dieser in einem Cargierkorb vorgewärmt.With the increasing scarcity of resources in terms of energy and materials, there are a number of proposals 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 furnace 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 aufheizen, 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 Elektroofen 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 furnace is passed through the heat exchanger on its way to the dedusting system.
Die Gegenstande 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 these fonts 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.
Aus der DE-A-3 232 139 ist eine Stahlschmelzanlage zum Betreiben einer Zweiofenanlage bekannt, bei der die Elekroöfen über eine Leitung miteinander verbunden sind. Bei dieser Anlage erfolgt das Abziehen der Gase aus dem im Betrieb befindlichen Ofen durch den Deckel. Die Gasleitung mündet anderseits im unteren Mantelbereich in das Ofengefäß, so daß die heißen Gase durch das in diesem Ofen befindliche, einzuschmelzende Material aufsteigen, bevor sie der Entstaubungseinrichtung zugeführt werden. Ferner ist aus der FR-A-2 259 907 eine Zwei-Ofen-Anlage bekannt, bei der die Öfen durch eine Leitung verbunden sind. Die Randgase aus dem im Betrieb befindlichen Ofen durchströmen die Charge im anderen Ofen horizontal bevor sie abgeführt werden.DE-A-3 232 139 discloses a steel melting plant for operating a two-furnace system, in which the electric furnaces are connected to one another via a line. In this system, the gases are extracted from the furnace in operation through the cover. The gas line, on the other hand, opens into the furnace casing in the lower jacket area, so that the hot gases rise through the material to be melted in this furnace before they are fed to the dedusting device. Furthermore, from FR-A-2 259 907 a two-furnace system is known in which the furnaces are connected by a line. The edge gases from the furnace in operation flow horizontally through the batch in the other furnace before they are discharged.
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 und 5.The invention achieves this aim by the characterizing features of claims 1 and 5.
Erfindungsgemäß werden zwei öfen durch eine im unteren Bereich des Obergefaßes 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 Chargiergut 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 Chargiergutes 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 Chargiergutsäule 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 das Chargiergut 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 the charge material, and the flue gas is sucked out of the flue gas 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 charge material 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 charge column 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 charge 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 ovens The use of two lids also clearly leaves the path previously followed. According to the invention, robust, proven, extremely low-maintenance components are used, which in the rough steelworks operation work in a very short time more cost-effectively and reliably 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
- 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
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
Am Deckel 23 des Ofens 20 ist eine Zuluftleitung 29 vorgesehen, die durch eine Absperrung 57 verschießbar ist.A
In das Gefäßoberteil 12 des Ofens 10 ragt ein Brenner 93, der über eine Zuleitung zu einer Versorgungsstation 91 der Zusatzbrennereinrichtung 90 führt.A
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
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.
The
Am Deckel 23 des Ofens 20 ist noch eine Rauchgasabführleitung 59 dargestellt, die einen Verdichter 39 sowie eine Absperrung 58 aufweist.On the
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
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 das Chargiergut 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
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 Chargiergut 41 in die Verbindungsleitung 25 ein Gitter 19 vorgesehen ist.In addition, the possibility is shown in detail of arranging a
- 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
- ChargiergutCargo
- 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 (7)
- A method for operating a dual-furnace installation, in particular for the production of steel, with arc furnaces (10, 20) connected via a gas line (15, 25) and means for charging material, for gas withdrawal (14, 24) and for gas purification and also for supplying power, one of the two furnaces, for melting down the charge located therein, being supplied with electric current and the other being separated from the power supply system, the furnace which has been removed from the power supply system and has been tapped being charged with feedstock, in particular scrap, and then the furnace vessel being closed by a cover, wherein after closing the furnace removed from the power supply system the gas located in the vessel space is drawn off above the stock column and during the removal by suction of the flue gas from the furnace separated from the power supply system the flue gas connection of the other furnace is interrupted for gas purification,
characterised in that
the flue gas is drawn off from the furnace in electrical operation from the region above the feedstock through the column of scrap above the level of the melt via a connecting line (15, 25) opening between the two furnaces in the lower region of the furnace vessel (12, 22) and is passed diagonally through the column of scrap into the furnace separated from the power supply system and that at the same time incoming air is taken up in the region of the cover of the furnace in electrical operation. - A method according to Claim 1, characterised in that the gases are supplied with incoming air which is adjustable in quantity.
- A method according to Claim 2, characterised in that a portion of the flue gases burned in an afterburning chamber is branched off and is used as incoming air.
- A method according to Claim 1, characterised in that the feedstock of the furnace in electrical operation is additionally heated by fuels.
- A dual-furnace apparatus, comprising two furnace vessels which can be closed by covers and which are connected via flue gas elbow pipes to a gas purification installation and the upper furnace vessels of which are connected together via a line, for performing the method according to one of Claims 1 to 5, characterised in that the connecting line (15, 25) has a radial separation means (T) which permits radial movement of the mouths of the connecting lines (15, 25), that the separation means (T) can be sealed gastight, that the connecting lines (15, 25) on either side of the separation means (T) each have a shutoff device (51, 52), that the connection of the connecting lines (15, 25) opens into the region of the upper vessel parts (12, 22) inclined towards the lower vessel parts (11, 21), and 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 elbow pipes (14, 24) of the cover (13, 23) which can be placed on the vessels.
- A dual-furnace apparatus according to Claim 5, characterised in that a sliding sleeve (61) is used for sealing the separation means (T).
- A dual-furnace apparatus according to Claim 5, characterised in that the connection of the connecting lines (15, 25) opens into a region of the upper vessel parts (12, 22) designed as a pocket (16, 26).
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0608591A1 EP0608591A1 (en) | 1994-08-03 |
| EP0608591B1 true EP0608591B1 (en) | 1997-02-26 |
Family
ID=6479072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93250356A Expired - Lifetime EP0608591B1 (en) | 1993-01-25 | 1993-12-21 | Process and installation for running a double furnace plant |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5499264A (en) |
| EP (1) | EP0608591B1 (en) |
| JP (1) | JPH0749179A (en) |
| CN (1) | CN1038260C (en) |
| AT (1) | ATE149209T1 (en) |
| BR (1) | BR9400314A (en) |
| DE (2) | DE4302285C3 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5479434A (en) * | 1994-03-11 | 1995-12-26 | Mannesmann Aktiengesellschaft | Double-hearth arc furnace for preheating scrap material and method of operating the same |
| DE4445209C2 (en) | 1994-12-17 | 1999-01-21 | Schloemann Siemag Ag | Method and device for operating a double-vessel arc furnace |
| DE19509285C2 (en) * | 1995-03-15 | 1997-03-20 | Gutehoffnungshuette Man | Melting vessel system |
| DE19545831C2 (en) * | 1995-12-08 | 2000-09-07 | Sms Demag Ag | Process for operating a double-vessel arc furnace system and double-vessel arc furnace |
| 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 |
| US6024912A (en) * | 1997-11-27 | 2000-02-15 | Empco (Canada) Ltd. | Apparatus and process system for preheating of steel scrap for melting metallurgical furnaces with concurrent flow of scrap and heating gases |
| 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 |
| ATE353980T1 (en) * | 2000-02-17 | 2007-03-15 | John A Vallomy | METHOD FOR THE REDUCTION TREATMENT OF LIQUID SLAG AND FILTER DUST OF AN ELECTRIC ARC FURNACE |
| JP5988014B1 (en) * | 2015-01-27 | 2016-09-07 | Ｊｆｅスチール株式会社 | Method for producing molten iron with electric furnace |
| CN108168320A (en) * | 2018-01-29 | 2018-06-15 | 大峘集团有限公司 | A kind of symmetrical double furnace chambers scrap steel preheating melting appartus and steel scrap melt method |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE346120B (en) * | 1968-01-08 | 1972-06-26 | Huta Zabrze Fa | |
| ES433419A1 (en) * | 1974-01-31 | 1976-11-01 | British Steel Corp | Improvements introduced in a method of manufacturing steel. (Machine-translation by Google Translate, not legally binding) |
| DE3225514C1 (en) * | 1982-07-08 | 1984-03-22 | Mannesmann AG, 4000 Düsseldorf | High current supply for an electric double hearth furnace |
| DE3232139A1 (en) * | 1982-08-26 | 1984-03-08 | Mannesmann AG, 4000 Düsseldorf | Steel melting plant with two furnace vessels |
| JPS59150006A (en) * | 1983-02-16 | 1984-08-28 | Daido Steel Co Ltd | Method and apparatus for melting scrap |
| DE3307400C1 (en) * | 1983-02-28 | 1984-01-19 | Mannesmann AG, 4000 Düsseldorf | Apparatus for preheating scrap to be melted down |
| DE3521569A1 (en) * | 1985-06-15 | 1986-12-18 | Neue Hamburger Stahlwerke GmbH, 2103 Hamburg | Process and equipment for preheating scrap to be introduced into an electric furnace |
| JPS6260810A (en) * | 1985-09-10 | 1987-03-17 | Daido Steel Co Ltd | Method for melting scrap |
| DE4015916A1 (en) * | 1990-05-17 | 1991-11-21 | Fuchs Technology Ag | MELTING UNIT WITH TWO MELTING OVENS arranged next to each other |
| JP3010600B2 (en) * | 1991-03-02 | 2000-02-21 | 大同特殊鋼株式会社 | DC arc melting equipment |
-
1993
- 1993-01-25 DE DE4302285A patent/DE4302285C3/en not_active Expired - Fee Related
- 1993-12-21 DE DE59305543T patent/DE59305543D1/en not_active Expired - Fee Related
- 1993-12-21 EP EP93250356A patent/EP0608591B1/en not_active Expired - Lifetime
- 1993-12-21 AT AT93250356T patent/ATE149209T1/en not_active IP Right Cessation
-
1994
- 1994-01-24 CN CN94100570A patent/CN1038260C/en not_active Expired - Fee Related
- 1994-01-24 BR BR9400314A patent/BR9400314A/en not_active IP Right Cessation
- 1994-01-24 US US08/185,552 patent/US5499264A/en not_active Expired - Fee Related
- 1994-01-25 JP JP6023127A patent/JPH0749179A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN1091777A (en) | 1994-09-07 |
| DE4302285A1 (en) | 1994-07-28 |
| CN1038260C (en) | 1998-05-06 |
| DE4302285C3 (en) | 1998-07-09 |
| EP0608591A1 (en) | 1994-08-03 |
| US5499264A (en) | 1996-03-12 |
| DE59305543D1 (en) | 1997-04-03 |
| DE4302285C2 (en) | 1994-11-03 |
| BR9400314A (en) | 1994-08-16 |
| JPH0749179A (en) | 1995-02-21 |
| ATE149209T1 (en) | 1997-03-15 |
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