EP2470678A1 - Vorrichtung zur entgasung einer stahlschmelze mit einem verbesserten auslaufrüssel - Google Patents
Vorrichtung zur entgasung einer stahlschmelze mit einem verbesserten auslaufrüsselInfo
- Publication number
- EP2470678A1 EP2470678A1 EP10759802A EP10759802A EP2470678A1 EP 2470678 A1 EP2470678 A1 EP 2470678A1 EP 10759802 A EP10759802 A EP 10759802A EP 10759802 A EP10759802 A EP 10759802A EP 2470678 A1 EP2470678 A1 EP 2470678A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spout
- ladle
- trunk
- holes
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
- C22B9/055—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ while the metal is circulating, e.g. combined with filtration
-
- 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 present invention relates to a device for degassing a molten steel with an improved spout.
- the present invention relates to a particular form of spout for avoiding local dead water regions in a steel ladle.
- the present invention further relates to a method of degassing the liquid steel with the improved spout.
- the process for degassing liquid steel is an RH process (Ruhrstahl-Heraeus process).
- RH process the liquid steel is conveyed from a ladle in a riser to an evacuation vessel.
- a conveying gas, in particular argon is introduced into the riser above the steel bath level.
- the stream of argon injected into the riser through several nozzles breaks down into a plethora of argon bubbles that rise in the immediate vicinity of the wall.
- the conveyance of the liquid steel is made possible by the volume increase by argon in the riser and by the pressure difference between the external air pressure and the negative pressure in the evacuation vessel.
- the argon bubbles entrain the melt and ensure a uniform melt circulation.
- the partial pressure is lowered at the same time and the decarburization reaction is accelerated.
- the steel sucked into the evacuation vessel is sprayed. This results in a strong increase in surface area and good degassing of the liquid steel.
- Oxygen which is simultaneously introduced throughout the treatment period and replenished, among other things, from the slag, leads to the formation of carbon monoxide (CO).
- CO is evacuated in the vacuum vessel, whereby the desired decarburization is achieved.
- the Feinentkohlung can on lowest possible values be optimized by additionally injected oxygen. A high rotational speed of the melt and thus an increase in the flow of carrier gas and an increase in the diameter of the bowl of the vacuum system lead to a faster decarburization process.
- DE 19511640 C1 discloses a trunk for a degassing vessel with a refractory lining and a multi-channel gas purging device arranged therein.
- the channels are distributed over the circumference of the trunk and extend, based on the central longitudinal axis of the trunk, through the refractory lining in the radial direction.
- the channels can be connected to at least one gas supply line on the outside.
- the channels are circumferentially arranged to form a nearly continuous gas curtain along the inner wall of the trunk in close succession.
- a steady stream of liquid steel is reached into the vacuum vessel.
- the distributed over the entire circumference, preferably fine-bubble gas supply allows a particularly fine distribution of the treatment gas at the same time greatly increased reaction volume between the treatment gas and molten steel. In this way, a higher and faster decarburization performance can be achieved, so that smaller amounts of reduction media are necessary.
- JP 1198418 A discloses a device and a method for the vacuum degassing of molten steel, in which gas can be introduced both into the inlet and outlet probes and the function of the proboscis can be alternately changed. From JP 57200514 A, a method for degassing molten steel is known, wherein the degassing effect is improved by degassing in an RH vacuum apparatus in which an inert gas is injected into a steel melting vessel from the bottom.
- JP 3271315 A discloses a RH vacuum decarburization process of stainless steel, wherein the degassing and decarburization are achieved in a short time and the loss of chromium is reduced. The result is achieved by using low silicon steel and repeated degassing and decarburization with an RH vacuum vessel.
- a vacuum vessel for an RH degassing apparatus wherein an ultrasonic oscillator is installed at a contact point with the liquid steel in the vacuum vessel to destroy bubbles generated by the gas blowing and to improve the reaction surface on the phase reaction ,
- JP 11158536 A discloses a method for melting steel with a very low carbon content, wherein inert gas is injected through the inlet pipe into the vessel under the added aluminum into the vessel at the outlet nozzle for circulation after decarburization.
- JP 3107412 A discloses a method of producing very low carbon steel, wherein argon is injected at the same time during decarburization into both the inlet and outlet tubes.
- a dead water area is usually formed between the spout and the refractory wall of the ladle. Due to the downward stream of melt from the spout, little material is drawn in from the immediate vicinity around the spout. As a result, the overall carbon concentration remains high due to the delayed homogenization. The dead water area mixes poorly with the rest of the melt because the average flow rate is low. Because of the low mass, momentum and energy exchange between the high carbon concentration dead water zone and the remainder of the low carbon concentration melt, the ladle melt must be recirculated frequently until the desired final carbon content is achieved. Since the ladle melt has to circulate frequently, the treatment time is high.
- the invention has for its object to provide an apparatus for degassing a molten steel with an improved spout, which reduces the formation of dead water areas.
- the object of the invention is to provide an improved and reliable method for degassing and / or decarburizing a molten steel, whereby the formation of dead water areas is reduced.
- the object of the present invention is achieved by a device comprising at least one degassing vessel, a Stahlg screenpfanne, an inlet trunk and arranged therein a gas purging device and an outlet spout.
- the spout has at the lower edge in the radial direction, based on the central longitudinal axis of the spout, at least one bore.
- the device is preferably an RH plant.
- the size and number of holes at the lower edge of the spout are dependent on the RH method and must be adjusted accordingly.
- the main parameters are the geometry and immersion depth of the inlet and outlet probes and the negative pressure in the RH vacuum vessel.
- the inventive device in particular the new shape of the spout, the local dead water area is reduced in size.
- the treatment and circulation time of the melt can be advantageously shortened. This leads to the advantageous reduction of argon consumption and further cost reduction.
- the productivity of the RH plant is increased.
- a preferred embodiment of the invention is an outlet spout, which has a plurality of bores (7) within a radius of 360 °.
- the outlet spout particularly preferably has a plurality of bores within a radius of 180 ° in the direction of the refractory wall of the ladle. Due to the inventive design of the spout, the local dead water areas are effectively reduced.
- the size and number of holes depends on the geometry and immersion depth of the spout and the vacuum in the evacuation vessel.
- a further preferred embodiment of the invention is a spout, wherein the holes have a diameter of 10 mm to 50 mm, preferably 25 mm to 35 mm. With these diameters for the holes good results are achieved in the Totwasserreduzi für a spout.
- a further preferred embodiment of the invention is a spout whose immersion depth in the molten steel of the ladle is from 300 mm to 1200 mm, preferably 400 mm to 1000 mm. In this range for the immersion depth good results are achieved in the Totwasserreduzi für spout.
- a further preferred embodiment of the invention is a spout, wherein one or more holes 50 mm to 900 mm, preferably 100 mm to 700 mm, are arranged above the lower edge of the spout.
- a further preferred embodiment of the invention is a spout, wherein holes in a row of holes or in several superposed rows of holes are on the spout. Preference is given to one or two superimposed rows of holes on the outlet trunk.
- the object of the present invention is achieved by a method for degassing a molten steel, wherein
- a conveying gas in particular argon, is introduced via the steel bath level into an inlet trunk
- liquid steel is drawn from a ladle into the inlet trunk
- liquid steel is conveyed from the inlet trunk into an evacuation vessel located above it
- the object of the present invention is further achieved by the use of the spout according to the invention in a RH plant for reducing local dead water areas in a ladle.
- a RH plant for reducing local dead water areas in a ladle.
- FIG. 1 shows a cross section through a RH plant according to the prior art without holes in the spout and with a local Totwasser which between the spout and the refractory wall of the ladle,
- FIG. 2 shows a cross section through an RH system according to the invention with holes in the outlet nozzle and with a reduced local dead water area between the outlet trunk and the refractory wall of the ladle,
- Fig. 3 shows a cross section through an RH system according to the invention in the idle state
- FIG. 4 shows a cross section through an RH plant according to the invention in the operating state.
- the RH plant I shown in FIG. 1 has a steel tundish 3 with a volume of 200 t.
- the immersion depth of the spout 1 and the inlet trunk 4 was 600 mm.
- the process time was 85 s.
- Argon 5 was introduced over the mirror of the steel bath 10 into the inlet trunk 4.
- the liquid steel 10 was sucked from the ladle 3 into the inlet trunk 4.
- the liquid steel 10 was conveyed from the inlet trunk 4 into the evacuation vessel 2 located above.
- the liquid steel 10 was degassed in the evacuation vessel 2.
- the liquid steel 10 was conveyed via the spout 1 back into the ladle 3.
- FIG. 2 shows a cross section through an inventive RH plant I with holes 7 in the spout 1 and with greatly reduced local Totwasser means 9 between the spout 1 and refractory wall 8 of the ladle 3.
- the procedure was as in the example in Fig. 1 with the following differences.
- the spout 1 had several holes 7 in the radial direction, based on the central longitudinal axis 6 of the spout 1 on the side towards the refractory wall 8 of the ladle 3.
- the holes 7 were 150 mm above the lower edge of the spout 1 is arranged.
- the immersion depth of the spout H sn ork e i was 400 mm.
- Molten steel 10 was sucked in from the immediate vicinity around the spout 1 ago. The homogenization in the molten steel 10 was faster. Consequently, the carbon concentration in the dead water region 9 dropped. The process time was thereby greatly reduced.
- Figures 3 and 4 illustrate the following example. First, the geometry of an RH plant in Table 1 and the physical quantities in Table 2 are explained.
- the negative pressure in the RH vessel is gradually reduced, for example, from initially 250 mbar down to 2 mbar within about 6 min.
- the pressure of 2 mbar is then also the lowest pressure in the RH vessel, in particular directly above the melt surface in the RH vessel.
- the cycle time in an RH plant is about 10 minutes to 50 minutes.
- the homogenization time in the melt at a spout without holes about 90 s to 480 s.
- the homogenization time in the melt is approximately 85 s to 456 s for a spout with holes. This means a reduction in the cycle time of about 5%.
- the number n of holes is preferably 3 to 9. The number is preferably odd, since central hole should lie on the axis, therefore in the narrowest gap between Pfannenausmautation and proboscis.
- the preferred bore diameter is 10 mm to 50 mm.
- the row of holes in the vertical direction should not be closer than 300 mm below the melt surface in the steel ladle, otherwise there is a risk that slag will be sucked in from the surface.
- two or more rows of holes can be arranged one above the other, see Table 2.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009039260A DE102009039260A1 (de) | 2009-08-28 | 2009-08-28 | Vorrichtung zur Entgasung einer Stahlschmelze mit einem verbesserten Auslaufrüssel |
| PCT/EP2010/005124 WO2011023337A1 (de) | 2009-08-28 | 2010-08-20 | Vorrichtung zur entgasung einer stahlschmelze mit einem verbesserten auslaufrüssel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2470678A1 true EP2470678A1 (de) | 2012-07-04 |
| EP2470678B1 EP2470678B1 (de) | 2016-10-12 |
Family
ID=43303941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10759802.1A Active EP2470678B1 (de) | 2009-08-28 | 2010-08-20 | Vorrichtung zur entgasung einer stahlschmelze mit einem verbesserten auslaufrüssel |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US9181602B2 (de) |
| EP (1) | EP2470678B1 (de) |
| BR (1) | BR112012004433B1 (de) |
| DE (1) | DE102009039260A1 (de) |
| RU (1) | RU2473704C1 (de) |
| TW (1) | TWI454579B (de) |
| WO (1) | WO2011023337A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2801627A1 (de) | 2013-05-06 | 2014-11-12 | Siemens VAI Metals Technologies GmbH | Vakuumbehandlungsgefäß zum Behandeln einer Metallschmelze, insbesondere für eine RH-Anlage |
| WO2015179680A2 (en) * | 2014-05-21 | 2015-11-26 | Novelis Inc. | Mixing eductor nozzle and flow control device |
| DE202015003235U1 (de) * | 2015-04-30 | 2016-08-02 | Beck U. Kaltheuner Feuerfeste Erzeugnisse Gmbh & Co. Kg | RH-Vakuumentgasungsanlage und Rüssel einer RH-Vakuumentgasungsanlage |
| WO2020011951A1 (de) | 2018-07-12 | 2020-01-16 | Sms Mevac Gmbh | Ruhrstahl-heraeus-verfahren ohne pfannentransportwagen |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57200514A (en) | 1981-06-03 | 1982-12-08 | Nippon Kokan Kk <Nkk> | Method for degassing molten steel |
| SU1060690A1 (ru) | 1982-07-02 | 1983-12-15 | Московский Ордена Октябрьской Революции И Ордена Трудового Красного Знамени Институт Стали И Сплавов | Устройство дл циркул ционного вакуумировани металла |
| JPH01198418A (ja) | 1988-02-01 | 1989-08-10 | Sumitomo Metal Ind Ltd | 溶鋼の真空脱ガス設備および真空脱ガス方法 |
| JPH01275715A (ja) | 1988-04-27 | 1989-11-06 | Kawasaki Steel Corp | Rh式脱ガス装置による溶鋼の真空脱ガス処理方法 |
| CA1337846C (en) * | 1988-06-21 | 1996-01-02 | Hiroshi Nishikawa | Process for vacuum degassing and decarbonization with temperature drop compensating feature |
| JPH02173204A (ja) | 1988-12-27 | 1990-07-04 | Nippon Steel Corp | Rh脱ガス装置の真空槽 |
| JPH03107412A (ja) | 1989-09-22 | 1991-05-07 | Kawasaki Steel Corp | 極低炭素鋼の溶製方法 |
| JPH03271315A (ja) | 1990-03-22 | 1991-12-03 | Sumitomo Metal Ind Ltd | ステンレス鋼のrh真空脱炭方法 |
| JP3107412B2 (ja) | 1990-07-20 | 2000-11-06 | 三井化学株式会社 | ジアルジミンを含有する湿気硬化性ポリウレタン組成物 |
| JP3539740B2 (ja) | 1992-02-05 | 2004-07-07 | Jfeスチール株式会社 | 環流式真空脱ガス槽での溶鋼脱硫方法および真空脱ガス槽 |
| CN2126624Y (zh) * | 1992-06-05 | 1993-01-27 | 冶金工业部钢铁研究总院 | 薄板坯连铸用特种水口 |
| JP3271315B2 (ja) | 1992-08-06 | 2002-04-02 | 栗田工業株式会社 | 廃水の処理方法 |
| JPH06299227A (ja) | 1993-04-14 | 1994-10-25 | Kawasaki Steel Corp | Rh式脱ガス装置による極低炭素鋼の製造方法 |
| DE19511557C2 (de) * | 1994-07-26 | 1996-07-11 | Veitsch Radex Ag | Gasspüleinrichtung |
| DE19511640C1 (de) | 1995-03-30 | 1996-05-23 | Veitsch Radex Ag | Rüssel für ein Entgasungsgefäß |
| JPH1198418A (ja) | 1997-09-24 | 1999-04-09 | Toyota Central Res & Dev Lab Inc | 撮像装置 |
| JPH11158536A (ja) | 1997-12-02 | 1999-06-15 | Sumitomo Metal Ind Ltd | 清浄性に優れた極低炭素鋼の溶製方法 |
| RU2215047C2 (ru) | 2001-12-25 | 2003-10-27 | Открытое акционерное общество "Новолипецкий металлургический комбинат" | Устройство для циркуляционного вакуумирования стали |
| PL204157B1 (pl) | 2005-08-16 | 2009-12-31 | Zak & Lstrok Ady Magnezytowe R | Króćce urządzenia do próżniowego odgazowywania stali |
-
2009
- 2009-08-28 DE DE102009039260A patent/DE102009039260A1/de not_active Withdrawn
-
2010
- 2010-08-20 EP EP10759802.1A patent/EP2470678B1/de active Active
- 2010-08-20 RU RU2011129328/02A patent/RU2473704C1/ru active
- 2010-08-20 BR BR112012004433-8A patent/BR112012004433B1/pt not_active IP Right Cessation
- 2010-08-20 US US13/392,944 patent/US9181602B2/en active Active
- 2010-08-20 WO PCT/EP2010/005124 patent/WO2011023337A1/de not_active Ceased
- 2010-08-24 TW TW099128160A patent/TWI454579B/zh not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011023337A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112012004433A2 (pt) | 2016-03-22 |
| WO2011023337A1 (de) | 2011-03-03 |
| US9181602B2 (en) | 2015-11-10 |
| RU2473704C1 (ru) | 2013-01-27 |
| DE102009039260A1 (de) | 2011-03-03 |
| EP2470678B1 (de) | 2016-10-12 |
| TWI454579B (zh) | 2014-10-01 |
| US20120160063A1 (en) | 2012-06-28 |
| BR112012004433B1 (pt) | 2018-06-12 |
| TW201120221A (en) | 2011-06-16 |
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