WO2009018796A1 - Device for slag-free tapping or for transferring a melt - Google Patents
Device for slag-free tapping or for transferring a melt Download PDFInfo
- Publication number
- WO2009018796A1 WO2009018796A1 PCT/DE2008/001144 DE2008001144W WO2009018796A1 WO 2009018796 A1 WO2009018796 A1 WO 2009018796A1 DE 2008001144 W DE2008001144 W DE 2008001144W WO 2009018796 A1 WO2009018796 A1 WO 2009018796A1
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- Prior art keywords
- channel
- melt
- slag
- vessel
- siphon
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Classifications
-
- 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
- C21C5/5294—General arrangement or layout of the electric melt shop
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/113—Treating the molten metal by vacuum treating
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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
- F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
- F27B3/19—Arrangements of devices for discharging
-
- 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
- F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
- F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
-
- 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
- F27D19/00—Arrangements of controlling devices
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/14—Charging or discharging liquid or molten material
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1509—Tapping equipment
-
- 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
- C21C2005/5288—Measuring or sampling devices
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0054—Means to move molten metal, e.g. electromagnetic pump
- F27D2003/0056—Means to move molten metal, e.g. electromagnetic pump through a syphon in a vacuum chamber, e.g. involving aspiration or pressure on the bath
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- a bay is specially designed or designed a separately attached bay, which adjoins a connecting wall of the lower vessel of the arc furnace and is connected via a tapping channel with this.
- DE 102 23 906 A1 can be controlled at pressure and vacuum-tight coverage of this bay window, by controlling the gas pressure in the bay, the tapping speed of the melt or the tapping can be started or interrupted.
- EP 1 181 491 B1 is a metallurgical vessel in which a siphon is an integral part of the lower vessel part.
- the invention is therefore an object of the invention to provide a device of the type mentioned above for slag-free melt transfer with good maintainability and high availability, with which can continue to avoid business interruptions for the replacement of a worn tapping system. It should also be possible to use a fixed arc furnace.
- siphon is designed as a separate, mobile unit.
- the essence of the invention thus consists in that the siphon for slag-free melt transfer is not firmly integrated into the vessel for melting or for the metallurgical work, so it is not firmly connected with this structurally, but is designed as an independent, independently movable or movable system ,
- the melt flow can be introduced and maintained by means of a negative pressure in the channel and be interrupted again by releasing the negative pressure.
- at least one vessel is movable in height.
- the proposal is to make it possible that with the help of the siphon concept a slag-free tapping and / or a fixed arc furnace and generally a slag-free transfer of melt between metallurgical vessels is reliably enabled.
- the concept should in particular be implemented in a relatively simple way to electric arc furnaces, steel pans, etc. and allow easy maintenance and in particular a quick replacement of the siphon.
- the system is also intended to allow controllability of the melt flow between the vessels, in particular the beginning and end of the melt flow.
- the transfer of a melt from an electric arc furnace 1 takes place into a first metallurgical vessel 2 and from there into a second metallurgical vessel 3.
- the siphon is designated in this and in all other figures with 4 and consists of an inlet channel 5, a connecting channel 6 and an outlet channel. 7
- a siphon 4 is positioned with refractory lined channels over the two vessels such that the two ends of inlet and outlet channel 5, 7 protrude into the respective melt.
- a negative pressure is built up at the upper end of the outlet channel 7.
- the corresponding connection is numbered 8.
- the melt flow is determined essentially by the height difference between the melts in both vessels 1, 2 and the channel cross sections and can be varied to a certain extent by relative changes in the height of the vessels.
- FIG. 2 shows the melt flow between two metallurgical vessels, in which the vessel to be filled is empty at the beginning and is filled from the arc furnace.
- the channel end is temporarily sealed gas-tight in the vessel to be filled.
- the closure 10 can be realized for example by sheets or plates at the channel end, which are provided with sealing compounds. Release of the melt flow may be accomplished by actively removing or opening the shutter 10, by timely melting of the shutter, or by exceeding a metallostatic pressure threshold above the shutter. It should be noted that the possibly necessary residual evacuation of the melt channel takes place more quickly than the gas volume in the channel rises again by the start of the melt outlet.
- the vessel to be filled is movable in height and is lowered during the tapping process according to the melt flow steadily down.
- the outlet end of the melt or outlet channel 7 can also be located outside the melt of the vessel to be filled.
- the height of the melt in the channel system can be linked by a control unit 12 with the vacuum generation.
- inert gas 13 can be introduced into the inlet channel 5 of the melt, similar to an RH system (FIG. 3). This accelerates the flow rate and increases the metallurgical purity.
- a slag detection system 14 may preferably be installed in the inlet channel 5 (for example an induction coil around the channel).
- the slag transfer can be reduced or avoided to a minimum by rapid gas filling of the melt channel.
- efficient intervention is significantly less favorable.
- Another way to detect running slag when emptying a vessel is the detection of the course of the negative pressure in Evacuation channel. If slag is sucked in, this is reflected in a discontinuity of the pressure curve.
- melt channel in discontinuous use of the channel can be preheated with hot burner gases or spent, for example, in a preheating furnace.
- the ends of the channels 5, 7, which dip into the melts, should preferably be designed to be exchangeable quickly, since slag attachments can form here over time and the edges of the inlet opening are subject to wear.
- this can also be used for the slagging, e.g. a fixed arc furnace, are used.
- the tapping system can be subjected to a gas pressure, wherein upon reaching the boundary layer of the gas pressure increases due to the higher density of the melt. In response to this signal, the system can then be slightly withdrawn, the vacuum for the suction of slag generated and thus the vessel to be detoxified.
- the transfer of the melt does not require a tilting movement.
- the melt comes in no significant contact with the ambient air, so that the gas absorption is reduced or prevented.
- the tapping process or the transfer of melt can be used to improve the metallurgical purity of the melt.
- the height difference between the melt channel inlet and outlet can be made larger than the metallostatic height in the vessel to be emptied, so that with the same outlet cross-section, a larger mass flow can be achieved.
- the melt can be purified with a customized system.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Charging Or Discharging (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
Einrichtung zum schlackenfreien Abstich oder zur Überführung einer Schmelze Device for slag-free tapping or for transferring a melt
Einrichtung zum schlackenfreien Abstich oder zur Überführung einer Schmelze aus einem metallurgischen Gefäß in ein anderes metallurgisches Gefäß, insbesondere aus einem kippbaren oder feststehenden Lichtbogenofen, in siphonartiger Ausbildung mit den im Oberbegriff von Anspruch 1 angegebenen Merkmalen.Device for slag-free tapping or for transferring a melt from a metallurgical vessel into another metallurgical vessel, in particular from a tiltable or fixed electric arc furnace, in siphon-like design with the features specified in the preamble of claim 1.
Um schlackefrei abzustechen, sind seit längerer Zeit einfache Siphonabstiche bekannt, die aber im Wesentlichen aus Gründen der Gasaufnahme der Schmelze beim Abstich und des geringeren Kippbedarfs weitgehend von Bodenabstichen verdrängt wurden. Um die Vorzüge, beider Systeme zu verbinden, wurden Siphonabstiche konzipiert, die in einem Bodenabstich münden ( DE 102 23 906 A1 ).In order to stave off slag-free, simple siphon punctures have been known for some time, but have largely been displaced by bottom taps for reasons of gas uptake of the melt during tapping and lower tilting requirements. In order to combine the advantages of both systems, Siphonabstiche were designed that open in a Bodenabstich (DE 102 23 906 A1).
Dort wird ein Erker besonders gestaltet oder ein separat angebauter Erker ausgeführt, der an eine Anschlusswand des Untergefäßes des Lichtbogenofens angrenzt und über einen Abstichkanal mit diesem verbunden ist. Bei der DE 102 23 906 A1 kann bei druck- und vakuumdichter Abdeckung dieses Erkers, durch Kontrolle des Gasdrucks im Erker, die Abstichgeschwindigkeit der Schmelze geregelt werden bzw. der Abstich gestartet oder unterbrochen werden. Auch aus der EP 1 181 491 B1 ist ein metallurgisches Gefäß bekannt, bei dem ein Siphon integraler Bestandteil des unteren Gefäßteiles ist.There, a bay is specially designed or designed a separately attached bay, which adjoins a connecting wall of the lower vessel of the arc furnace and is connected via a tapping channel with this. In DE 102 23 906 A1 can be controlled at pressure and vacuum-tight coverage of this bay window, by controlling the gas pressure in the bay, the tapping speed of the melt or the tapping can be started or interrupted. Also known from EP 1 181 491 B1 is a metallurgical vessel in which a siphon is an integral part of the lower vessel part.
Zur Überführung von Schmelze aus einem feststehenden metallurgischen Gefäß in ein nachfolgendes Gefäß für den nächsten metallurgischen Prozess wird von der Universität Missouri RoIIa eine kaskadenförmige Anordnung von Gefäßen ausgeführt, die feste siphonartige Gefäßgebilde aufweisen, die kontinuierlich betrieben werden sollen.For the transfer of melt from a fixed metallurgical vessel in a subsequent vessel for the next metallurgical process of the University of Missouri RoIIa a cascaded arrangement of vessels is carried out, the fixed siphon-like vessel structures to be operated continuously.
Bei den aufgeführten Konzepten ist die Zugänglichkeit der Kanäle des Siphons für Instandhaltungsarbeiten schwierig zu realisieren. Es kann nicht ausgeschlossen werden, dass Anfrierungen oder Auswaschungen bei den vorbenannten Systemen zu Funktionsbeeinträchtigungen und langwierigen Stillständen führen. Die Integration von Siphonsystemen ( Missouri RoIIa ) beeinträchtigt die metallurgisch optimale Ausgestaltung der Gefäße zwischen Einschmelzaggregat und Verteiler. Generell wird durch die Integration von Siphonsystemen in oder an die metallurgischen Gefäße der Gestaltungsfreiraum für prozessoptimierte Formgebung der metallurgischen Gefäße eingeschränkt.In the concepts listed, the accessibility of the channels of the siphon for maintenance work is difficult to implement. It can not be ruled out that frostbites or washouts in the aforementioned systems lead to functional impairments and lengthy standstills. The integration of siphon systems (Missouri RoIIa) impairs the optimal metallurgical design of the vessels between the smelting aggregate and the distributor. In general, the integration of siphon systems into or onto the metallurgical vessels limits the freedom of design for process-optimized shaping of the metallurgical vessels.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zur schlackefreien Schmelzenüberführung mit guter Wartbarkeit und hoher Verfügbarkeit zu schaffen, mit der sich weiterhin Betriebsunterbrechungen für den Austausch eines verschlissenen Abstichsystems vermeiden lassen. Ermöglicht werden soll femer die Verwendung eines fest stehenden Lichtbogenofens.The invention is therefore an object of the invention to provide a device of the type mentioned above for slag-free melt transfer with good maintainability and high availability, with which can continue to avoid business interruptions for the replacement of a worn tapping system. It should also be possible to use a fixed arc furnace.
Diese Aufgabe wird erfindungsgemäß bei einer gattungsgemäßen Einrichtung dadurch gelöst, dass der Siphon als eigenständige, mobile Einheit ausgebildet ist. Der Kern der Erfindung besteht somit darin, dass der Siphon zur schlackefreien Schmelzenüberführung nicht in das Gefäß zum Einschmelzen oder für die metallurgische Arbeit fest integriert ist, also mit diesem baulich nicht fest verbunden ist, sondern als eigenständiges, unabhängig beweg- oder verfahrbares System ausgebildet ist.This object is achieved in a generic device in that the siphon is designed as a separate, mobile unit. The essence of the invention thus consists in that the siphon for slag-free melt transfer is not firmly integrated into the vessel for melting or for the metallurgical work, so it is not firmly connected with this structurally, but is designed as an independent, independently movable or movable system ,
Der Schmelzenfluss kann mittels eines Unterdrucks im Kanal eingeleitet und aufrechterhalten werden und durch Aufheben des Unterdrucks wieder unterbrochen werden. Um den Schmelzenfluss zu steuern und den Schmelzenspiegel im Bereich der feuerfesten Kanalenden zu belassen, wird nach einer bevorzugten Ausführung vorgeschlagen, dass mindestens ein Gefäß in der Höhe verfahrbar ist. Mit dem Vorschlag soll ermöglicht werden, dass mit Hilfe des Siphonkonzeptes ein schlackefreier Abstich und/oder ein feststehender Lichtbogenofen und allgemein eine schlackenfreie Überführung von Schmelze zwischen metallurgischen Gefäßen zuverlässig ermöglicht wird. Weiterhin soll sich das Konzept insbesondere auf relativ einfache Art an Lichtbogenöfen, Stahlpfannen usw. realisieren lassen und auf einfache Art Wartungsarbeiten sowie insbesondere einen schnellen Austausch des Siphons ermöglichen. Das System soll darüber hinaus eine Steuerbarkeit des Schmelzenflusses zwischen den Gefäßen ermöglichen, insbesondere Beginn und Ende des Schmelzflusses.The melt flow can be introduced and maintained by means of a negative pressure in the channel and be interrupted again by releasing the negative pressure. In order to control the melt flow and to leave the melt level in the region of the refractory channel ends, it is proposed according to a preferred embodiment that at least one vessel is movable in height. The proposal is to make it possible that with the help of the siphon concept a slag-free tapping and / or a fixed arc furnace and generally a slag-free transfer of melt between metallurgical vessels is reliably enabled. Furthermore, the concept should in particular be implemented in a relatively simple way to electric arc furnaces, steel pans, etc. and allow easy maintenance and in particular a quick replacement of the siphon. The system is also intended to allow controllability of the melt flow between the vessels, in particular the beginning and end of the melt flow.
Die Erfindung wird nachfolgend mit Bezug auf die Zeichnungen näher erläutert.The invention will be explained in more detail with reference to the drawings.
Dabei zeigen die Figuren schematisch verschiedene Varianten der erfindungsgemäßen Einrichtung.The figures show schematically different variants of the device according to the invention.
Nach der Figur 1 erfolgt die Überführung einer Schmelze aus einem Lichtbogenofen 1 in ein erstes metallurgisches Gefäß 2 und von dort in ein zweites metallurgisches Gefäß 3. Der Siphon ist in dieser und in allen anderen Figuren mit 4 bezeichnet und besteht aus einem Eintrittskanal 5, einem Verbindungskanal 6 und einem Austrittskanal 7.According to FIG. 1, the transfer of a melt from an electric arc furnace 1 takes place into a first metallurgical vessel 2 and from there into a second metallurgical vessel 3. The siphon is designated in this and in all other figures with 4 and consists of an inlet channel 5, a connecting channel 6 and an outlet channel. 7
In diesem Fall wird ein Siphon 4 mit feuerfest ausgekleideten Kanälen über den beiden Gefäßen derart positioniert, dass die beiden Enden von Eintritts- bzw. Austrittskanal 5, 7 in die jeweilige Schmelze hineinragen. Zwischen dem zu entleerenden und dem zu befüllenden Gefäß 1 , 2 liegt ein Höhenunterschied vor. Um den Schmelzenfluss einzuleiten, wird am oberen Ende des Austrittskanals 7 ein Unterdruck aufgebaut. Der entsprechende Anschluss ist mit 8 beziffert. Der Schmelzenfluss wird im Wesentlichen durch den Höhenunterschied zwischen den Schmelzen in beiden Gefäßen 1 , 2 und den Kanalquerschnitten festgelegt und kann in einem gewissen Maße durch relative Höhenveränderung der Gefäße variiert werden.In this case, a siphon 4 is positioned with refractory lined channels over the two vessels such that the two ends of inlet and outlet channel 5, 7 protrude into the respective melt. Between the container to be emptied and to be filled 1, 2 there is a difference in height. To initiate the melt flow, a negative pressure is built up at the upper end of the outlet channel 7. The corresponding connection is numbered 8. The melt flow is determined essentially by the height difference between the melts in both vessels 1, 2 and the channel cross sections and can be varied to a certain extent by relative changes in the height of the vessels.
Die Figur 2 zeigt den Schmelzenfluss zwischen zwei metallurgischen Gefäßen, bei denen das zu füllende Gefäß zu Beginn leer ist und aus dem Lichtbogenofen befüllt wird.FIG. 2 shows the melt flow between two metallurgical vessels, in which the vessel to be filled is empty at the beginning and is filled from the arc furnace.
Zur Erzeugung eines Unterdrucks im Austrittskanal 7, um den Schmelzenfluss zwischen den Gefäßen einzuleiten, wird das Kanalende in dem zu befüllenden Gefäß vorübergehend gasdicht verschlossen. Der Verschluss 10 kann beispielsweise durch Bleche oder Platten am Kanalende realisiert werden, die mit Dichtmassen versehen sind. Die Freigabe des Schmelzenflusses kann durch aktives Erntfernen oder Öffnen des Verschlusses 10, durch zeitgenaues Schmelzen des Verschlusses oder Überschreiten eines Schwellenwertes des metallostatischen Druckes über dem Verschluss realisiert werden. Dabei ist zu beachten, dass die gegebenenfalls notwendige Restevakuierung des Schmelzenkanals schneller erfolgt, als das Gasvolumen im Kanal durch Beginn des Schmelzenaustritts wieder ansteigt. Um bei der Überführung der Schmelze nur einen kleinen Teil des Austrittskanals 7 in die Schmelze eintauchen zu lassen, ist das zu befüllende Gefäß in der Höhe verfahrbar und wird beim Abstichvorgang gemäß dem Schmelzenfluss stetig nach unten abgesenkt. Grundsätzlich kann sich das Auslaufende des Schmelzen- bzw. Austrittskanals 7 aber auch außerhalb der Schmelze des zu befüllenden Gefäßes befinden.To generate a negative pressure in the outlet channel 7, to initiate the melt flow between the vessels, the channel end is temporarily sealed gas-tight in the vessel to be filled. The closure 10 can be realized for example by sheets or plates at the channel end, which are provided with sealing compounds. Release of the melt flow may be accomplished by actively removing or opening the shutter 10, by timely melting of the shutter, or by exceeding a metallostatic pressure threshold above the shutter. It should be noted that the possibly necessary residual evacuation of the melt channel takes place more quickly than the gas volume in the channel rises again by the start of the melt outlet. In order to immerse in the transfer of the melt only a small part of the outlet channel 7 in the melt, the vessel to be filled is movable in height and is lowered during the tapping process according to the melt flow steadily down. In principle, however, the outlet end of the melt or outlet channel 7 can also be located outside the melt of the vessel to be filled.
Um den Füllgrad des Schmelzenkanals 7 zu erfassen, wird (wie in Figur 3 dargestellt) beispielsweise an einem Kanal 11 am oberen Ende des Verbindungskanals 6, der auch zur Evakuierung genutzt wird, mittels eines Sensors 15 der Höhenstand der Schmelze im Kanalsystem erfasst. Der erfasste Höhenstand kann von einer Regeleinheit 12 mit der Unterdruckerzeugung verknüpft werden.To detect the degree of filling of the melt channel 7, (as shown in Figure 3), for example, on a channel 11 at the upper end of the connecting channel 6, which is also used for evacuation, detected by means of a sensor 15, the height of the melt in the channel system. The detected ride height can be linked by a control unit 12 with the vacuum generation.
Zur Unterstützung der Schmelzenströmung im Kanal kann in den Eintrittskanal 5 der Schmelze, ähnlich wie bei einer RH Anlage, Inertgas 13 eingebracht werden ( Fig. 3 ). Dies beschleunigt die Fließgeschwindigkeit und erhöht den metallurgischen Reinheitsgrad.In order to support the melt flow in the channel, inert gas 13 can be introduced into the inlet channel 5 of the melt, similar to an RH system (FIG. 3). This accelerates the flow rate and increases the metallurgical purity.
Zum Erkennen von mitlaufender Schlacke kann nach Figur 4 vorzugsweise im Eintrittskanal 5 ein Schlackeerkennungssystem 14 installiert werden ( beispielsweise eine Induktionsspule um den Kanal ). Im Falle der Schlackedetektion kann so durch schnelle Gasbefüllung des Schmelzenkanals die Schlackeüberführung auf ein Minimum reduziert oder vermieden werden. Bei herkömmlicher Schlackeerkennung am EAF ist eine effiziente Eingriffsmöglichkeit deutlich ungünstiger.In order to detect entrained slag, according to FIG. 4 a slag detection system 14 may preferably be installed in the inlet channel 5 (for example an induction coil around the channel). In the case of slag detection, the slag transfer can be reduced or avoided to a minimum by rapid gas filling of the melt channel. With conventional slag detection on the EAF, efficient intervention is significantly less favorable.
Eine weitere Möglichkeit zum Erkennen mitlaufender Schlacke beim Entleeren eines Gefäßes ist die Erfassung des Verlaufs des Unterdrucks im Evakuierungskanal. Wird Schlacke mit eingesaugt, zeigt sich dies in einer Unstetigkeit des Druckverlaufs.Another way to detect running slag when emptying a vessel is the detection of the course of the negative pressure in Evacuation channel. If slag is sucked in, this is reflected in a discontinuity of the pressure curve.
Zum Vorheizen des Schmelzenkanals bei unstetigem Einsatz kann der Kanal mit heißen Brennergasen vorgeheizt werden oder beispielsweise in einen Vorwärmofen verbracht werden.For preheating the melt channel in discontinuous use of the channel can be preheated with hot burner gases or spent, for example, in a preheating furnace.
Zur Minimierung des Temperaturabfalls der Schmelze beim Überführen der Schmelze oder zum Einbringen zusätzlicher Wärme in die Schmelze, kann um den Schmelzenkanal, beispielsweise den Verbindungskanal 6, herum eine Induktionsheizung 9 installiert werden, die aufgrund des konstanten Kanaiquerschnitts sehr wirksam ausgeführt werden kann.In order to minimize the temperature drop of the melt during the transfer of the melt or to introduce additional heat into the melt, around the melt channel, such as the connecting channel 6, around an induction heater 9 can be installed, which can be carried out very effectively due to the constant Kanaiquerschnitts.
Die Enden der Kanäle 5, 7, die in die Schmelzen hineintauchen, sollten vorzugsweise schnell austauschbar ausgeführt sein, da sich hier mit der Zeit Schlackenansätze bilden können und die Kanten der Eintrittsöffnung einem Verschleiß unterworfen sind. • The ends of the channels 5, 7, which dip into the melts, should preferably be designed to be exchangeable quickly, since slag attachments can form here over time and the edges of the inlet opening are subject to wear. •
Bei einer angepassten Ausführungsart des oben beschriebenen Abstichsystems kann dieses auch für das Abschlacken, z.B. eines feststehenden Lichtbogenofens, eingesetzt werden. Zur Erkennung der Grenzschicht zwischen Schlacke und Schmelze kann beispielsweise das Abstichsystem mit einem Gasdruck beaufschlagt werden, wobei beim Erreichen der Grenzschicht der Gasdruck aufgrund der höheren Dichte der Schmelze ansteigt. Beim Ansprechen dieses Signals kann dann das System geringfügig zurückgezogen, der Unterdruck für das Ansaugen der Schlacke erzeugt und somit das Gefäß entschlackt werden.In an adapted embodiment of the tapping system described above, this can also be used for the slagging, e.g. a fixed arc furnace, are used. To detect the boundary layer between slag and melt, for example, the tapping system can be subjected to a gas pressure, wherein upon reaching the boundary layer of the gas pressure increases due to the higher density of the melt. In response to this signal, the system can then be slightly withdrawn, the vacuum for the suction of slag generated and thus the vessel to be detoxified.
Die Vorteile, die mit der erfindungsgemäßen Einrichtung erzielbar sind, lassen sich wie folgt zusammenfassen: Zuverlässiger Siphonbetrieb beim schlackenfreien Abstich eines Lichtbogenofens oder allgemein der Schmelzenüberführung zwischen metallurgischen Gefäßen, wobei der Siphon gut zu warten und gegebenenfalls schnell austauschbar ist.The advantages that can be achieved with the device according to the invention can be summarized as follows: Reliable siphon operation when slag-free tapping an arc furnace or generally the melt transfer between metallurgical vessels, the siphon is easy to maintain and, if necessary, quickly replaced.
Das Überführen der Schmelze erfordert keine Kippbewegung.The transfer of the melt does not require a tilting movement.
Beim Überführen der Schmelze kommt die Schmelze in keinen nennenswerten Kontakt mit der Umgebungsluft, so dass die Gasaufnahme verringert bzw. verhindert wird.When transferring the melt, the melt comes in no significant contact with the ambient air, so that the gas absorption is reduced or prevented.
Es gibt bei den metallurgischen Gefäßen keine Einschränkungen bei der Nutzung konventioneller Gefäße und auch beim Lichtbogenofen sind nur geringfügige Modifikationen notwendig.There are no restrictions in the use of conventional vessels in the metallurgical vessels and also in the electric arc furnace, only minor modifications are necessary.
Durch den Unterdruck und ein optionales Eindüsen von Inertgas kann der Abstichvorgang oder das Überführen von Schmelze genutzt werden zur Verbesserung des metallurgischen Reinheitsgrades der Schmelze.Due to the negative pressure and an optional injection of inert gas, the tapping process or the transfer of melt can be used to improve the metallurgical purity of the melt.
Der Höhenunterschied zwischen Schmelzenkanaleintritt und -austritt kann größer gestaltet werden, als die metallostatische Höhe im zu entleerenden Gefäß, so dass bei gleichem Austrittsquerschnitt ein größerer Massenfluss erreicht werden kann.The height difference between the melt channel inlet and outlet can be made larger than the metallostatic height in the vessel to be emptied, so that with the same outlet cross-section, a larger mass flow can be achieved.
Die Schmelze kann mit einem angepassten System entschlackt werden. The melt can be purified with a customized system.
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007036970 | 2007-08-04 | ||
| DE102007036970.2 | 2007-08-04 | ||
| DE102008008033.0 | 2008-02-06 | ||
| DE102008008033A DE102008008033A1 (en) | 2007-08-04 | 2008-02-06 | Device for slag-free tapping or for transferring a melt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009018796A1 true WO2009018796A1 (en) | 2009-02-12 |
Family
ID=40176048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE2008/001144 Ceased WO2009018796A1 (en) | 2007-08-04 | 2008-07-09 | Device for slag-free tapping or for transferring a melt |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102008008033A1 (en) |
| WO (1) | WO2009018796A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9932649B2 (en) | 2012-12-21 | 2018-04-03 | Posco | Fixed-type electric furnace and molten steel production method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105771808A (en) * | 2016-03-02 | 2016-07-20 | 昆明安厦新材料科技有限公司 | Solid raw material liquefying device and technological process |
| CN107199332B (en) * | 2017-05-15 | 2019-11-22 | 兰州理工大学 | The sending device of the slag removal robot in the aluminum ingot continuous casting production line |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776439A (en) * | 1972-04-03 | 1973-12-04 | Gen Electric | Fail-safe liquid pumping and flow control system |
| WO1996006319A1 (en) * | 1994-08-18 | 1996-02-29 | Comalco Aluminium Limited | Method of transferring molten metal |
| JP2000328135A (en) * | 1999-05-13 | 2000-11-28 | Kurosaki Harima Corp | Hot repair method of snorkel for vacuum degassing equipment and repair refractory used for this method |
| JP2001201261A (en) * | 2000-01-21 | 2001-07-27 | Nissei Ltd | Hot water tapping device of furnace |
| US6596221B1 (en) * | 1999-04-01 | 2003-07-22 | Arcmet Technologie Gmbh | Metallurgical vessel having a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel |
| EP1486271A1 (en) * | 2003-06-13 | 2004-12-15 | MPC Metal Process Control AB | A method and a device for detecting slag |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| UA79599C2 (en) | 2001-09-26 | 2007-07-10 | Sms Demag Ag | Arc furnace with melt tapping through the bay window (variants) and method for arc furnace operating (variants) |
-
2008
- 2008-02-06 DE DE102008008033A patent/DE102008008033A1/en not_active Withdrawn
- 2008-07-09 WO PCT/DE2008/001144 patent/WO2009018796A1/en not_active Ceased
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776439A (en) * | 1972-04-03 | 1973-12-04 | Gen Electric | Fail-safe liquid pumping and flow control system |
| WO1996006319A1 (en) * | 1994-08-18 | 1996-02-29 | Comalco Aluminium Limited | Method of transferring molten metal |
| US6596221B1 (en) * | 1999-04-01 | 2003-07-22 | Arcmet Technologie Gmbh | Metallurgical vessel having a tapping device and method for the controlled, slag-free extraction of molten metal from said vessel |
| JP2000328135A (en) * | 1999-05-13 | 2000-11-28 | Kurosaki Harima Corp | Hot repair method of snorkel for vacuum degassing equipment and repair refractory used for this method |
| JP2001201261A (en) * | 2000-01-21 | 2001-07-27 | Nissei Ltd | Hot water tapping device of furnace |
| EP1486271A1 (en) * | 2003-06-13 | 2004-12-15 | MPC Metal Process Control AB | A method and a device for detecting slag |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9932649B2 (en) | 2012-12-21 | 2018-04-03 | Posco | Fixed-type electric furnace and molten steel production method |
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| DE102008008033A1 (en) | 2009-02-05 |
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