WO2010015242A1 - Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method - Google Patents

Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method Download PDF

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Publication number
WO2010015242A1
WO2010015242A1 PCT/DE2009/001096 DE2009001096W WO2010015242A1 WO 2010015242 A1 WO2010015242 A1 WO 2010015242A1 DE 2009001096 W DE2009001096 W DE 2009001096W WO 2010015242 A1 WO2010015242 A1 WO 2010015242A1
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WO
WIPO (PCT)
Prior art keywords
inlet
trunk
inlet nozzle
tube
degassing vessel
Prior art date
Application number
PCT/DE2009/001096
Other languages
German (de)
French (fr)
Inventor
Hans-Jürgen ODENTHAL
Dieter Tembergen
Original Assignee
Sms Siemag Aktiengesellschaft
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sms Siemag Aktiengesellschaft filed Critical Sms Siemag Aktiengesellschaft
Priority to US13/057,614 priority Critical patent/US20110179909A1/en
Priority to AU2009279227A priority patent/AU2009279227B2/en
Priority to RU2011108576/02A priority patent/RU2468092C2/en
Priority to BRPI0918898-3A priority patent/BRPI0918898B1/en
Priority to EP09776057A priority patent/EP2324133B1/en
Priority to ES09776057T priority patent/ES2385780T3/en
Publication of WO2010015242A1 publication Critical patent/WO2010015242A1/en

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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to an inlet trunk for a working according to the RH process degassing vessel for metallurgical melts.
  • the liquid steel from a ladle in a riser by means of a conveying gas, in particular argon, which is introduced above the Stahlbadspiegel in the riser, by its increase in volume in the riser and further by the pressure difference between the outer Air pressure and the negative pressure in the evacuation vessel in this transported.
  • a conveying gas in particular argon
  • the argon bubbles are germs for CO formation, promote deoxidation and the deposition of non-metallic particles.
  • the steel sucked into the evacuation vessel is sprayed, whereby an increase in surface area and thus a good degassing occurs.
  • the object of the invention is to improve the flow conditions within the inlet spout.
  • Method working degassing vessel for metallurgical melts which is characterized in that distributed over the axial length of the inlet spout tube scavenger are introduced through the inert gas into the inlet trunk and that upstream of this tube scavenger groove-like trained guide shapes are provided which in the clear cross-section of Protruding inlet spout.
  • the essence of the invention thus consists in the realization of a passive flow guidance in the inlet trunk of the RH plant.
  • the passive flow control differs from the active flow control (eg blowing in gas) in that the primary fluid is influenced exclusively by shaping measures.
  • This goal is achieved by a special shape of the refractory lining in the axial direction of the inlet trunk.
  • the lining takes place from the inlet side - ie from bottom to top - through a plurality of groove-like guide shapes twisted by a certain angle and projecting into the melt.
  • These conductive forms extend into the inlet trunk and induce a swirl in the ascending multiphase mixture of melt and gas bubbles.
  • the gas bubbles are transported away from the refractory wall in the direction of the axis of the intake spout.
  • There is a homogenization of the characteristic flow profile instead. This process is associated with a more intensive mixing in the inlet trunk.
  • twisted refractory lead forms are installed between the inert gas addition sites (tube scavenger).
  • the number of guide shapes depends on the number of tube scavengers.
  • the guide shapes with the thickness D, the depth T and the radius R are rotated from bottom to top, ie in the direction of the trunk longitudinal axis, by an angle ⁇ .
  • orders of magnitude for this angle are between 20 ° and 45 °.
  • the advantage of the invention is therefore that the treatment or circulation time in the RH plant can be reduced due to the better homogenization of the multi-phase mixture of melt and gas bubbles. Higher amounts of gas could be used, which can improve the kinetics of metallurgy. As a result, the productivity of the RH plant is increased.
  • Fig. 1 in perspective a provided with conductive shapes section of an intake trunk and
  • the guide shapes are twisted with a thickness D, a depth T and a radius R in the longitudinal direction of the trunk, namely by an angle ⁇ .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Details (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

The invention relates to an inlet nozzle for a degassing vessel for metallurgical melting operating according to the RH method. According to the invention, tube rinsers are provided in a distributed manner over the axial length of the inlet nozzle. Inert gas can be introduced into the inlet nozzle through said tube rinsers, and groove-like guide forms which extend into the open cross-section of the inlet nozzle are provided upstream of said tube rinsers in each case.

Description

Einlaufrüssel für ein nach dem RH-Verfahren arbeitendes Entgasungsgefäß für metallurgische Schmelzen Inlet for a RH process degassing vessel for metallurgical melts
Die Erfindung betrifft einen Einlaufrüssel für ein nach dem RH-Verfahren arbeitendes Entgasungsgefäß für metallurgische Schmelzen.The invention relates to an inlet trunk for a working according to the RH process degassing vessel for metallurgical melts.
Beim RH (Ruhrstahl-Heraeus) -Verfahren wird der flüssige Stahl aus einer Gießpfanne in einem Steigrohr mit Hilfe eines Fördergases, insbesondere Argon, das über dem Stahlbadspiegel in das Steigrohr eingeführt wird, durch dessen Volumenvergrößerung im Steigrohr und ferner durch den Druckunterschied zwischen dem äußeren Luftdruck und dem Unterdruck im Evakuierungsgefäß in dieses befördert. Die Argonblasen stellen Keime für die CO-Bildung dar, fördern die Desoxydation und die Abscheidung nichtmetallischer Partikel. Der in das Evakuierungsgefäß eingesaugte Stahl wird zersprüht, wodurch eine Oberflächenvergrößerung und somit eine gute Entgasung eintritt.In the RH (Ruhrstahl-Heraeus) method, the liquid steel from a ladle in a riser by means of a conveying gas, in particular argon, which is introduced above the Stahlbadspiegel in the riser, by its increase in volume in the riser and further by the pressure difference between the outer Air pressure and the negative pressure in the evacuation vessel in this transported. The argon bubbles are germs for CO formation, promote deoxidation and the deposition of non-metallic particles. The steel sucked into the evacuation vessel is sprayed, whereby an increase in surface area and thus a good degassing occurs.
Aus EP 297 850 A1 ist bekannt, im Einlaufrüssel mehrere Kanäle umfangsseitig anzuordnen, die in zwei Gruppen unterteilt werden, wobei eine Gruppe mit Gas unter hohem Druck und eine Gruppe mit Gas unter niedrigem Druck beaufschlagt wird. Auf diese Weise sollen die zugeführten Gasströme unterschiedlich tief in die durch den Rüssel geführte Metallschmelze eindringen und eine gleichmäßige Begasung der Metallschmelze über den Rüsselquerschnitt ermöglichen.From EP 297 850 A1 it is known to circumferentially arrange several channels in the inlet trunk, which are subdivided into two groups, one group being exposed to gas under high pressure and one group to gas under low pressure. In this way, the supplied gas streams should penetrate at different depths into the metal melt guided through the trunk and allow a uniform gassing of the molten metal through the trunk cross-section.
Aus der Literatur: Modeling of Two-Phase in RH Vacuum Degassing Vessel with the Effect of the Rotation Magnetic Field, AISTech 2004 Proceedings, Volume 1, pp. 1125-1133; Baokuan Li et al. (PRC) ist die Beeinflussung der Strömung durch ein Magnetfeld bekannt. Diese Lösung zur magneto-hydrodynamischen Beeinflussung der Schmelzenströmung sieht ein wassergekühltes Bauteil unter dem RH-Gefäßboden vor. Diese Bauform ist zu groß für eine technische Anwendung. Darüber hinaus stellt die Wasserkühlung ein Sicherheitsrisiko dar.From the literature: Modeling Two-Phase in RH Vacuum Degassing Vessel with the Effect of the Magnetic Field Rotation, AISTech 2004 Proceedings, Volume 1, pp. 1125-1133; Baokuan Li et al. (PRC) is known to influence the flow through a magnetic field. This solution for magneto-hydrodynamic influencing of the melt flow provides for a water-cooled component under the RH vessel bottom. This design is too big for a technical application. In addition, water cooling poses a security risk.
Aufgabe der Erfindung ist es, die Strömungsverhältnisse innerhalb des Einlaufrüssels zu verbessern.The object of the invention is to improve the flow conditions within the inlet spout.
Gelöst wird diese Aufgabe erfindungsgemäß mit einem Einlaufrüssel für ein nach dem RH-This object is achieved according to the invention with an inlet trunk for a according to the RH
Verfahren arbeitendes Entgasungsgefäß für metallurgische Schmelzen, der dadurch gekennzeichnet ist, dass über die axiale Länge des Einlaufrüssels verteilt Röhrchenspüler vorgesehen sind, durch die Inertgas in den Einlaufrüssel einleitbar ist und dass stromaufwärts dieser Röhrchenspüler jeweils rillenartig ausgebildete Leitformen vorgesehen sind, die in den lichten Querschnitt des Einlaufrüssels hineinragen.Method working degassing vessel for metallurgical melts, which is characterized in that distributed over the axial length of the inlet spout tube scavenger are introduced through the inert gas into the inlet trunk and that upstream of this tube scavenger groove-like trained guide shapes are provided which in the clear cross-section of Protruding inlet spout.
Der Kern der Erfindung besteht somit in der Realisierung einer passiven Strömungsführung im Einlaufrüssel der RH-Anlage.The essence of the invention thus consists in the realization of a passive flow guidance in the inlet trunk of the RH plant.
Mit der Erfindung wird erreicht, dass die im Einlaufrüssel einer RH-Anlage aufsteigende Schmelze und die emulgierten Inertgasblasen durch eine passive Strömungsführung homogenisiert werden.With the invention it is achieved that the rising in the inlet trunk of an RH plant melt and the emulsified inert gas bubbles are homogenized by a passive flow guidance.
Die passive Strömungsbeeinflussung unterscheidet sich von der aktiven Strömungsbeeinflussung (z. B. Einblasen von Gas) dadurch, dass das Primärfluid ausschließlich durch formgebende Maßnahmen beeinflusst wird.The passive flow control differs from the active flow control (eg blowing in gas) in that the primary fluid is influenced exclusively by shaping measures.
Dieses Ziel wird erreicht durch eine spezielle Formgebung der Feuerfestausmauerung in axialer Richtung des Einlaufrüssels. Die Ausmauerung erfolgt von der Einlaufseite her - also von unten nach oben - durch mehrere, um einen bestimmten Winkel verdrehte und in die Schmelze hineinragende, rillenartige Leitformen. Diese Leitformen reichen in den Einlaufrüssel hinein und induzieren im aufsteigenden Mehrphasengemisch aus Schmelze und Gasblasen einen Drall. Infolge dessen werden die Gasblasen von der Feuerfestwand weg in Richtung der Achse des Einlaufrüssels transportiert. Es findet eine Vergleichmäßigung des charakteristischen Strömungsprofils statt. Dieser Vorgang ist mit einer intensiveren Vermischung im Einlaufrüssel verbunden.This goal is achieved by a special shape of the refractory lining in the axial direction of the inlet trunk. The lining takes place from the inlet side - ie from bottom to top - through a plurality of groove-like guide shapes twisted by a certain angle and projecting into the melt. These conductive forms extend into the inlet trunk and induce a swirl in the ascending multiphase mixture of melt and gas bubbles. As a result, the gas bubbles are transported away from the refractory wall in the direction of the axis of the intake spout. There is a homogenization of the characteristic flow profile instead. This process is associated with a more intensive mixing in the inlet trunk.
Zwischen den Zugabestellen des Inertgases (Röhrchenspüler), werden verdrillte Leitformen aus Feuerfestmaterial installiert. Die Anzahl der Leitformen richtet sich nach der Anzahl der Röhrchenspüler.Between the inert gas addition sites (tube scavenger), twisted refractory lead forms are installed. The number of guide shapes depends on the number of tube scavengers.
Die Leitformen mit der Dicke D, der Tiefe T und dem Radius R werden von unten nach oben, also in Richtung der Rüssellängsachse, um einen Winkel α verdreht. Vorzugsweise Größenordnungen für diesen Winkel liegen zwischen 20° und 45°.The guide shapes with the thickness D, the depth T and the radius R are rotated from bottom to top, ie in the direction of the trunk longitudinal axis, by an angle α. Preferably orders of magnitude for this angle are between 20 ° and 45 °.
Dadurch wird den zwischen den Leitformen aufsteigenden Gasblasen eine spiralförmige Bewegung aufgezwungen, die großräumig betrachtet zu einer Vergleichmäßigung des radialen Strömungsprofiles führt.As a result, the gas bubbles rising between the guide shapes are forced into a spiral movement which, viewed over a large area, leads to a homogenization of the radial flow profile.
Infolge der induzierten Wirbelbildung steigen die Gasblasen nicht mehr nur in Wandnähe, sondern nun verstärkt auch in der Mitte des Einlaufrüssels auf.As a result of the induced vortex formation, the gas bubbles no longer rise only near the wall, but now increasingly in the middle of the inlet spout.
Als Folge dessen wird die bisher bekannte Überhöhung der Schmelze über dem Einlaufrüssel im RH-Gefäß reduziert. Die hierdurch eingesparte potentielle Energie wird in kinetische Energie umgesetzt. Als Folge dessen kann die Behandlungs- bzw. Umlaufzeit der Schmelze reduziert werden. Darüber kann eine Reduzierung der Bauhöhe der RH Gefäße angenommen werden.As a result, the previously known elevation of the melt over the inlet trunk in the RH vessel is reduced. The potential energy thus saved is converted into kinetic energy. As a result, the treatment time of the melt can be reduced. In addition, a reduction in the height of the RH vessels can be assumed.
Der Vorteil der Erfindung besteht somit darin, dass sich die Behandlungs- bzw. Umlaufzeit in der RH-Anlage infolge der besseren Homogenisierung des Mehrphasengemisches aus Schmelze und Gasblasen reduzieren lässt. Höhere Gasmengen könnten angewendet werden, wodurch die Kinetik der Metallurgie verbessert werden kann. Folglich wird die Produktivität der RH-Anlage gesteigert.The advantage of the invention is therefore that the treatment or circulation time in the RH plant can be reduced due to the better homogenization of the multi-phase mixture of melt and gas bubbles. Higher amounts of gas could be used, which can improve the kinetics of metallurgy. As a result, the productivity of the RH plant is increased.
Die Erfindung soll nachfolgend mit Bezug auf die Zeichnungen. erläutert werden. Dabei zeigt: Fig. 1 perspektivisch einen mit Leitformen versehenen Teilabschnitt eines Einlaufrüssels undThe invention will be described below with reference to the drawings. be explained. Showing: Fig. 1 in perspective a provided with conductive shapes section of an intake trunk and
Fig.2 einen entsprechenden Querschnitt.2 shows a corresponding cross-section.
Wie ersichtlich, sind die Leitformen mit einer Dicke D, einer Tiefe T und einem Radius R in Längsrichtung des Rüssels verdrillt, und zwar um einen Winkel α. As can be seen, the guide shapes are twisted with a thickness D, a depth T and a radius R in the longitudinal direction of the trunk, namely by an angle α.

Claims

Patentansprüche claims
1. Einlaufrüssel für ein nach dem RH-Verfahren arbeitendes Entgasungsgefäß für metallurgische Schmelzen, dadurch gekennzeichnet, dass über die axiale Länge des Einlaufrüssels verteilt Röhrchenspüler vorgesehen sind, durch die Inertgas in den Einlaufrüssel einleitbar ist und dass stromaufwärts dieser Röhrchenspüler jeweils rillenartig ausgebildete Leitformen vorgesehen sind, die in den lichten Querschnitt des Einlaufrüssels hineinragen.1. Inlet for a working according to the RH process degassing vessel for metallurgical melts, characterized in that over the axial length of the inlet spout distributed tube scavenger are provided, can be introduced through the inert gas into the inlet trunk and that upstream of this tube scavenger groove-like trained guide shapes are provided , which protrude into the clear cross section of the inlet trunk.
2. Einlaufrüssel nach Anspruch 1 , dadurch gekennzeichnet, dass die Leitformen aus Feuerfestmaterial bestehen.2. inlet trunk according to claim 1, characterized in that the guide forms consist of refractory material.
3. Einlaufrüssel nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Leitformen eine Dicke D, eine Tiefe T und einen Radius R aufweisen und in Richtung der Rüssellängsachse, um einen Winkel α verdreht sind.3. inlet trunk according to one of the preceding claims, characterized in that the guide shapes have a thickness D, a depth T and a radius R and in the direction of the trunk longitudinal axis, are rotated by an angle α.
4. Einlaufrüssel nach Anspruch 3, dadurch gekennzeichnet, dass der Winkel α zwischen 20° und 45° beträgt. 4. inlet trunk according to claim 3, characterized in that the angle α is between 20 ° and 45 °.
PCT/DE2009/001096 2008-08-07 2009-08-03 Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method WO2010015242A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US13/057,614 US20110179909A1 (en) 2008-08-07 2009-08-03 Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method
AU2009279227A AU2009279227B2 (en) 2008-08-07 2009-08-03 Inlet nozzle for a degassing vessel for metallurgical melting operating according to the RH method
RU2011108576/02A RU2468092C2 (en) 2008-08-07 2009-08-03 Supply sleeve for degassing reservoir for metallurgical melts operating using rh method
BRPI0918898-3A BRPI0918898B1 (en) 2008-08-07 2009-08-03 INLET SNORKEL FOR A DESGASIFICATION CONTAINER OPERATING ACCORDING TO THE HR PROCESS FOR METALURGICAL FUSIONS
EP09776057A EP2324133B1 (en) 2008-08-07 2009-08-03 Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method
ES09776057T ES2385780T3 (en) 2008-08-07 2009-08-03 Inlet sleeve for a degassing vessel that works according to the RH procedure for metallurgical casting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008037166.1 2008-08-07
DE102008037166A DE102008037166A1 (en) 2008-08-07 2008-08-07 Inlet for a RH process degassing vessel for metallurgical melts

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WO2010015242A1 true WO2010015242A1 (en) 2010-02-11

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US (1) US20110179909A1 (en)
EP (1) EP2324133B1 (en)
AU (1) AU2009279227B2 (en)
BR (1) BRPI0918898B1 (en)
DE (1) DE102008037166A1 (en)
ES (1) ES2385780T3 (en)
RU (1) RU2468092C2 (en)
WO (1) WO2010015242A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101696327B1 (en) * 2014-12-12 2017-01-13 주식회사 포스코 Vacuum Treating Apparatus
CN113456842B (en) * 2021-07-06 2022-11-18 云南乍甸乳业有限责任公司 Steam jet type fermentation medium heating sterilizer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62270733A (en) * 1986-05-16 1987-11-25 Hitachi Cable Ltd Suction type vacuum degassing device
EP0297850A1 (en) * 1987-06-29 1989-01-04 Kawasaki Steel Corporation Method and apparatus for degassing molten metal utilizing RH method

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US3321300A (en) * 1963-08-13 1967-05-23 Conzinc Riotinto Ltd Degassing of metals or alloys
SU1096285A1 (en) * 1983-01-17 1984-06-07 Московский Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Институт Стали И Сплавов Apparatus for circulatory vacuum treatment of steel
US5024421A (en) * 1990-05-08 1991-06-18 Usx Corporation Interlocking snorkel refractory
JPH04304308A (en) * 1991-03-29 1992-10-27 Sumitomo Metal Ind Ltd Method for promoting degassing in molten metal
US5603749A (en) * 1995-03-07 1997-02-18 Bethlehem Steel Corporation Apparatus and method for vacuum treating molten steel
RU2092579C1 (en) * 1995-07-05 1997-10-10 Акционерное общество "Новолипецкий металлургический комбинат" Method of circulation degassing of metal in ladle
RU2172784C1 (en) * 2000-01-10 2001-08-27 Открытое акционерное общество "Новолипецкий металлургический комбинат" Method of steel ladle treatment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62270733A (en) * 1986-05-16 1987-11-25 Hitachi Cable Ltd Suction type vacuum degassing device
EP0297850A1 (en) * 1987-06-29 1989-01-04 Kawasaki Steel Corporation Method and apparatus for degassing molten metal utilizing RH method

Also Published As

Publication number Publication date
EP2324133B1 (en) 2012-06-13
ES2385780T3 (en) 2012-07-31
RU2011108576A (en) 2012-09-20
DE102008037166A1 (en) 2010-02-11
EP2324133A1 (en) 2011-05-25
RU2468092C2 (en) 2012-11-27
BRPI0918898A2 (en) 2015-12-01
US20110179909A1 (en) 2011-07-28
BRPI0918898B1 (en) 2017-10-31
AU2009279227B2 (en) 2013-07-04
AU2009279227A1 (en) 2010-02-11

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