US20110179909A1 - 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 PDFInfo
- Publication number
- US20110179909A1 US20110179909A1 US13/057,614 US200913057614A US2011179909A1 US 20110179909 A1 US20110179909 A1 US 20110179909A1 US 200913057614 A US200913057614 A US 200913057614A US 2011179909 A1 US2011179909 A1 US 2011179909A1
- Authority
- US
- United States
- Prior art keywords
- snorkel
- inlet
- inlet snorkel
- angle
- guide shapes
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007872 degassing Methods 0.000 title claims abstract description 9
- 238000002844 melting Methods 0.000 title claims abstract description 7
- 230000008018 melting Effects 0.000 title claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 239000011261 inert gas Substances 0.000 claims abstract description 9
- 230000004323 axial length Effects 0.000 claims abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
Abstract
An inlet snorkel for a degassing vessel operating by the RH process. The inlet snorkel is for a degassing vessel for metallurgical melting using the RH process. Gas injection pipes through which inert gas can be introduced into the inlet snorkel are distributed along the axial length of the inlet snorkel, and groove-like guide shapes are provided upstream of these gas injection pipes so as to project into the clear cross section of the inlet snorkel.
Description
- This is a U.S. national stage of Application No. PCT/DE2009/001096, filed on Aug. 3, 2009, which claims priority to German Application No: 10 2008 037 166.1, filed: Aug. 7, 2008, the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The invention is directed to an inlet snorkel for a degassing vessel for metallurgical melting using a Ruhrstahl-Heraeus (RH) process.
- 2. Related Art
- In the RH process, molten steel is conveyed from a ladle in an up leg by a delivery gas, particularly argon, which is fed into the up leg above the liquid steel level, into an evacuation vessel due to the expansion in volume of the delivery gas in the up leg and a pressure difference between outside air pressure and negative pressure in the evacuation vessel. Argon bubbles present nuclei for CO formation and promote deoxidation and removal of nonmetal particles. The steel drawn into the evacuation vessel is atomized resulting in an increased surface and, therefore, good degassing.
- It is known from EP 297 850 A1 to arrange a plurality of conduits around the circumference of an inlet snorkel so as to be divided into two groups, with gas under high pressure being admitted to one group and gas under low pressure to another group. In this way, the supplied gas flows penetrate to different depths in the molten metal guided through the snorkel and allow a uniform gassing of the molten metal over the cross section of the snorkel.
- It is known from the literature to influence flow through a magnetic field: “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). This solution for exerting a magnetohydrodynamic effect on the melt flow provides a water-cooled component below a floor of an RH vessel. This construction is too large for technical application. Further, the water cooling presents a safety hazard.
- It is the object of the invention to improve the flow conditions within the inlet snorkel.
- According to one embodiment of the invention, an inlet snorkel for a degassing vessel for metallurgical melting using the RH process is characterized in that gas injection pipes through which inert gas can be introduced into the inlet snorkel are distributed along the axial length of the inlet snorkel, and in that groove-like guide shapes are provided upstream of these gas injection pipes so as to project into the clear cross section of the inlet snorkel.
- Accordingly, in one embodiment of the invention, a passive flow guidance in the inlet snorkel of the RH installation is realized.
- In one embodiment of the invention, the melt rising in the inlet snorkel of a RH installation and the emulsified inert gas bubbles are homogenized through a passive flow guidance.
- In passive influencing of flow, as distinct from active influencing of flow (e.g., bubbling in of gas), the primary fluid is influenced exclusively by formative steps.
- This goal is achieved by a special shaping of the refractory lining in axial direction of the inlet snorkel. The lining proceeds from the inlet side, i.e., from bottom to top, through a plurality of groove-like guide shapes which are twisted by a determined angle and project into the melt. These guide shapes extend into the inlet snorkel and induce a swirling in the rising multiphase mixture of melt and gas bubbles.
- As a result, the gas bubbles are transported away from the refractory wall in direction of the axis of the inlet snorkel. A homogenization of the characteristic flow profile takes place. This process brings about a more intensive mixing in the inlet snorkel.
- Twisted guide shapes of refractory material are installed between the delivery locations of the inert gas (gas injection pipes). The quantity of guide shapes is determined by the quantity of gas injection pipes.
- The guide shapes having a thickness D, depth T, radius R, and are twisted at an angle α from bottom to top, i.e., in direction of the longitudinal axis of the snorkel. This angle is preferably on the order of 20° to 45°.
- Accordingly, a spiral-shaped motion is imposed on the gas bubbles rising between the guide shapes which, considered over a large area, leads to a homogenization of the radial flow profile.
- Due to the induced whirling, the gas bubbles no longer rise only in the vicinity of the wall, but also to a greater extent in the center of the inlet snorkel.
- As a result, the previously experienced elevation of the melt above the inlet snorkel in the RH vessel is reduced. The potential energy saved in this way translates to kinetic energy. As a result, the treatment time and circulating time of the melt can be reduced. Beyond this, a reduction in the overall height of the RH vessels can be expected.
- Accordingly, an advantage of one embodiment of the invention consists in that the treatment time and circulating time in the RH installation can be reduced as a result of the improved homogenization of the multiphase mixture of melt and gas bubbles. Larger quantities of gas could be used so that the kinetics of the metallurgy can be improved. Consequently, the productivity of the RH installation is increased.
- The invention will be described more fully in the following with reference to the drawings. In the drawings:
-
FIG. 1 is a perspective view of a portion of the inlet snorkel provided with guide shapes; and -
FIG. 2 is a corresponding end view of an inlet snorkel. - As can be seen, the guide shapes having a thickness D, a depth T, a radius R, and are twisted in longitudinal direction of the snorkel, namely, by an angle α.
- An
inlet snorkel 10 for a degassing vessel for metallurgical melting uses the RH process and includes gas injection pipes through which inert gas can be introduced into theinlet snorkel 10. The gas injection pipes are distributed along the axial length of theinlet snorkel 10. Groove-like guide shapes 12 are provided upstream of these gas injection pipes so as to project into the clear cross section of theinlet snorkel 10. In one embodiment of the invention, theguide shapes 12 are made of refractory material. The guide shapes 12 having a thickness D, a depth T, a radius R, and are twisted at an angle α in direction of the longitudinal axis of the snorkel. The angle α is preferably between 20° and 45°. - Thus, while there have shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.
Claims (9)
1.-4. (canceled)
5. An inlet snorkel for a degassing vessel for metallurgical melting using an RH process, comprising:
a plurality of gas injection pipes distributed along an axial length of the inlet snorkel and configured to introduce inert gas into the inlet snorkel; and
a plurality of groove-like guide shapes arranged upstream of the plural gas injection pipes so as to project into an open cross section of the inlet snorkel.
6. The inlet snorkel according to claim 5 , wherein the plural groove-like guide shapes are each a refractory material.
7. The inlet snorkel according to claim 6 , wherein each of the plural groove-like guide shapes has a thickness D, a depth T, a radius R, and are twisted at an angle α in a direction of a longitudinal axis of the snorkel.
8. The inlet snorkel according to claim 7 , wherein the angle α is between 20° and 45°.
9. The inlet snorkel according to claim 5 , wherein each of the plural groove-like guide shapes has a thickness D, a depth T, a radius R, and are twisted at an angle α in a direction of a longitudinal axis of the snorkel.
10. The inlet snorkel according to claim 7 , wherein the angle α is between 20° and 45°.
11. A method of providing flow in an inlet snorkel for a degassing vessel for metallurgical melting using an RH process comprising:
introducing inert gas into the inlet snorkel via gas injection distributed along an axial length of the inlet snorkel;
delivering the inert gas to a plurality of groove-like guide shapes pipes that project into an open cross section of the inlet snorkel upstream of the gas injection, whereby a passive flow guidance is provided;
homogenizing a melt rising in the inlet and emulsified inert gas bubbles by the passive flow guidance by an induced swirling in the rising mixture of the melt and the emulsified insert gas bubbles; and
transporting the emulsified insert gas bubbles away from a refractory wall in a direction of an axis of the inlet snorkel,
wherein each of the plural guide shapes having a thickness D, depth T, a radius R, and are twisted at an angle α from bottom to top in a direction of a longitudinal axis of the snorkel, and the gas bubbles rise in a vicinity of a wall of the inlet snorkel and to a greater extent in a center of the inlet snorkel.
12. The inlet snorkel according to claim 11 , wherein the angle α is between 20° and 45.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008037166A DE102008037166A1 (en) | 2008-08-07 | 2008-08-07 | Inlet for a RH process degassing vessel for metallurgical melts |
DE102008037166.1 | 2008-08-07 | ||
PCT/DE2009/001096 WO2010015242A1 (en) | 2008-08-07 | 2009-08-03 | Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110179909A1 true US20110179909A1 (en) | 2011-07-28 |
Family
ID=41137760
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/057,614 Abandoned US20110179909A1 (en) | 2008-08-07 | 2009-08-03 | Inlet nozzle for a degassing vessel for metallurgical melting operating according to the rh method |
Country Status (8)
Country | Link |
---|---|
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) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20160071702A (en) * | 2014-12-12 | 2016-06-22 | 주식회사 포스코 | Vacuum Treating Apparatus |
CN113456842A (en) * | 2021-07-06 | 2021-10-01 | 林秀媚 | Steam jet type fermentation medium heating sterilizer |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3321300A (en) * | 1963-08-13 | 1967-05-23 | Conzinc Riotinto Ltd | Degassing of metals or alloys |
JPS62270733A (en) * | 1986-05-16 | 1987-11-25 | Hitachi Cable Ltd | Suction type vacuum degassing device |
US5011531A (en) * | 1987-06-29 | 1991-04-30 | Kawasaki Steel Corporation | Method and apparatus for degassing molten metal utilizing RH method |
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 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
-
2008
- 2008-08-07 DE DE102008037166A patent/DE102008037166A1/en not_active Withdrawn
-
2009
- 2009-08-03 US US13/057,614 patent/US20110179909A1/en not_active Abandoned
- 2009-08-03 AU AU2009279227A patent/AU2009279227B2/en active Active
- 2009-08-03 RU RU2011108576/02A patent/RU2468092C2/en active
- 2009-08-03 BR BRPI0918898-3A patent/BRPI0918898B1/en active IP Right Grant
- 2009-08-03 EP EP09776057A patent/EP2324133B1/en active Active
- 2009-08-03 WO PCT/DE2009/001096 patent/WO2010015242A1/en active Application Filing
- 2009-08-03 ES ES09776057T patent/ES2385780T3/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3321300A (en) * | 1963-08-13 | 1967-05-23 | Conzinc Riotinto Ltd | Degassing of metals or alloys |
JPS62270733A (en) * | 1986-05-16 | 1987-11-25 | Hitachi Cable Ltd | Suction type vacuum degassing device |
US5011531A (en) * | 1987-06-29 | 1991-04-30 | Kawasaki Steel Corporation | Method and apparatus for degassing molten metal utilizing RH method |
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 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20160071702A (en) * | 2014-12-12 | 2016-06-22 | 주식회사 포스코 | Vacuum Treating Apparatus |
KR101696327B1 (en) | 2014-12-12 | 2017-01-13 | 주식회사 포스코 | Vacuum Treating Apparatus |
CN113456842A (en) * | 2021-07-06 | 2021-10-01 | 林秀媚 | Steam jet type fermentation medium heating sterilizer |
Also Published As
Publication number | Publication date |
---|---|
DE102008037166A1 (en) | 2010-02-11 |
AU2009279227A1 (en) | 2010-02-11 |
BRPI0918898B1 (en) | 2017-10-31 |
WO2010015242A1 (en) | 2010-02-11 |
ES2385780T3 (en) | 2012-07-31 |
RU2011108576A (en) | 2012-09-20 |
RU2468092C2 (en) | 2012-11-27 |
AU2009279227B2 (en) | 2013-07-04 |
EP2324133B1 (en) | 2012-06-13 |
BRPI0918898A2 (en) | 2015-12-01 |
EP2324133A1 (en) | 2011-05-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SMS SIEMAG AG, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ODENTHAL, HANS-JUERGEN;TEMBERGEN, DIETER;REEL/FRAME:025931/0611 Effective date: 20110214 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |