EP0772695B1 - Gasspüleinrichtung im rüssel eines vakuum-entgasungsgefässes - Google Patents
Gasspüleinrichtung im rüssel eines vakuum-entgasungsgefässes Download PDFInfo
- Publication number
- EP0772695B1 EP0772695B1 EP95928468A EP95928468A EP0772695B1 EP 0772695 B1 EP0772695 B1 EP 0772695B1 EP 95928468 A EP95928468 A EP 95928468A EP 95928468 A EP95928468 A EP 95928468A EP 0772695 B1 EP0772695 B1 EP 0772695B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas
- channels
- purging device
- gas purging
- blowpipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
- B22D1/005—Injection assemblies therefor
Definitions
- the invention relates to a gas purging device for a a refractory lined trunk Degassing vessel.
- DE 39 11 881 C1 is a fired gas purging plug known in the side wall of an evacuation vessel in Area of the molten steel is installed. This is what it is about a discrete gas purging element.
- the liquid Steel from a ladle in a riser with the help a conveying gas, in particular argon, above the steel bath level is inserted into the riser, through the Volume increase in the riser pipe and further by the Pressure difference between the outside air pressure and the Vacuum in the evacuation vessel transported into this.
- the in the evacuation vessel is sprayed with steel, which causes a large increase in surface area and thus a good degassing occurs.
- Oxygen that is under during the entire treatment period other is supplied from the slag leads to Formation of carbon monoxide, which outgasses in the vacuum vessel, with what the desired decarburization is achieved.
- a quick decarburization process is particularly possible through a high circulation speed of the melt and thus a Increase in the conveying gas flow and an increase in Trunk diameter of the vacuum system reached.
- EP 0 297 850 A1 describes a method and a device for degassing molten metal as part of an RH process described.
- 61 281811 is a proboscis of one Degassing vessel known in which a gas purging ring with non-directional porosity is used. From the outside to the inside gas is supplied through the undirected pores, which then between the molten steel and the refractory Lining runs in order to form a base in the To prevent proboscis area.
- the invention is based, known Optimize gas purging devices for degassing vessels, in particular a reduced and more uniform Wear behavior of the refractory ceramic lining is sought.
- the channels of the gas purging device should be in small distance to each other over the entire circumference and preferably over at least part (e.g. 10th up to 50%) of the height of the refractory lining of the proboscis extend.
- the invention relates to its most general Embodiment a gas purging device with the features of claim 1.
- the constructive design of the ring-like Gas purging device can be in different ways be modified.
- the gas purging device as a monolithic, to design cast or pressed annular block, in which the channels are arranged radially.
- the annular block can also consist of several there are refractory, for example pressed ring segments, where the channels run in the individual segments.
- Each ring segment is, depending on its size, formed with a corresponding number of channels, wherein a further embodiment provides the channels one Ring segment on the outside to a common gas distribution chamber to connect, which in turn to a Gas supply line can be connected.
- the Gas distribution chambers also flow-wise among themselves be connected so that only one Gas supply line is required. This will make the supplied gas flow equalized.
- In connection with the feature of forming channels with very small Opening width (or very small diameter) makes this possible, compared with the prior art lower gas pressure to work and so that the Gas rises immediately after entering the trunk.
- the shape and size of the ring segments can vary widely can be varied.
- annular gas purging device consisting of a total of ten ring segments build up.
- Each ring segment can in turn consist of several stones, whereby in all stones the Channels are formed.
- the gas channels rotationally symmetrical over the circumference of the refractory Place the trunk lining. This will create a particularly even radial gas supply in the Metal melt guaranteed.
- the gas pressure can be from channel to channel adjust so that the gas supplied can penetrate into the molten metal at different depths, however, as shown, according to the invention always only via one relatively short distance.
- the channels can be simple holes; after a Embodiment, the channels are formed by metal pipes, that lie firmly in the refractory lining.
- the distribution of the treatment medium within the Molten metal is further improved in that the Gas ducts are alternately offset in height become.
- the following embodiment shows one such embodiment in detail.
- the channels are aligned horizontally run; however, one is also inclined to the horizontal Arrangement of the channels conceivable, the channels then For example, are aligned so that the gas supply takes place against the flow direction of the molten metal.
- the invention is based on a Embodiment described in more detail.
- Figure 1 shows a partial perspective view of a RH degassing vessel and especially the one here area of interest of two proboscis (inlet proboscis 10, Discharge nozzle 12).
- a refractory Lining 14 can be seen here, from a total of seven ring-like and superimposed levels 16a ... f consists. Each level 16a ... f is made of refractory bricks 18 composed.
- the stones 18 of the level 16d together form one Gas purging device according to the invention, which in FIG Supervision is shown in detail.
- Figure 2 shows that forty stones 18 together the form annular plane 16d, each with four stones 18 are combined to form a ring segment S1 to S10.
- the Stones 18 or segments S1 to S10 are on theirs corresponding side surfaces mortared together.
- each stone 18 has two horizontally aligned and radial with respect to the central longitudinal axis M of the trunk 10 extending channels 20, 22 on the Height and laterally offset, their distance each is about 5 cm, both between the Channels 20, 22 of a stone, as well as between the channels neighboring stones.
- the channels 20, 22 (with an inner diameter of each 1 mm) each run from the outside 18a to Inside 18i of stones 18.
- Each segment S1 to S10 has one on its outer surface directly connected gas distribution chamber 24, the is connected gas-tight to the outer surface and made of metal consists.
- the channels 20, 22 run accordingly on the outside in the gas distribution chamber 24 Room.
- Each gas distribution chamber 24 has one (not here shown) connection area over which the Gas distribution chamber 24 is supplied with the treatment medium, which then through the channels 20, 22 into the trunk interior 26 can be injected, the close-knit, even and height-offset distribution of the channels 20, 22 about the scope of the gas purging device and its radial Alignment ensure that the treatment medium, for example argon, evenly towards the im Space 26 flowing molten metal is injected radially. This creates a kind of circular gas curtain formed on the cylindrical inner wall of the Proboscis 10 rises.
- Level 16a ... f as a gas purging device according to the invention train, but also several levels 16a ... f, the can be adjacent or spaced apart.
- the arrangement of the channels 20, 22 can vary from stone to stone 18 vary.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
- Das Gas muß sehr feinblasig in die Schmelze eingedüst werden.
- Das Gas muß in einem nahezu lückenlosen Gasschleier umfangsseitig zugeführt werden.
- Die Gaszuführung soll so erfolgen, daß das Gas möglichst nur im unmittelbaren Wandbereich des Rüssels aufsteigt.
- Figur 1:
- eine perspektivische, teilweise aufgerissene Ansicht eines RH-Entgasungsgefäßes,
- Figur 2:
- eine Aufsicht auf eine Gasspüleinrichtung gemäß der Erfindung,
- Figur 3:
- eine Frontansicht eines Steines der Gasspüleinrichtung nach Figur 2.
Claims (10)
- Gasspüleinrichtung für einen mit einem feuerfesten Werkstoff ausgekleideten Rüssel (10, 12) eines Entgasungsgefäßes, wobei die Gasspüleinrichtung eine Vielzahl von Kanälen (20, 22) aufweist, die, über den Umfang des Rüssels (10,12) verteilt, durch die feuerfeste Auskleidung (14) in radialer Richtung, bezogen auf die Mittenlängsachse M des Rüssels (10, 12), verlaufen und außenseitig an mindestens eine Gaszuführleitung anschließbar und derart mit Gas beaufschlagbar sind, daß das Gas nach Eintritt in den Rüssel (10, 12) unmittelbar benachbart zu dessen Innenwand aus feuerfestem Werkstoff aufsteigt, dadurch gekennzeichnet, daß die Kanäle (20, 22) zur weiteren Gaszuführung in die Metallschmelze hineina) unterschiedliche Querschnitte oder unterschiedliche Durchmesser zwischen 0,5 und 2 mm aufweisenb) einen Abstand von weniger als 10 cm zueinander besitzen, undc) höhenmäßig versetzt angeordnet sind.
- Gasspüleinrichtung nach Anspruch 1 in Form eines monolithischen, ringförmigen Blocks aus feuerfestem Werkstoff mit darin verlaufenden Kanälen.
- Gasspüleinrichtung nach Anspruch 1 in Form eines ringförmigen Blockes aus einem feuerfesten Werkstoff, der von mehreren feuerfesten Ringsegmenten S1 bis S10 mit darin angeordneten Kanälen (20, 22) gebildet wird.
- Gasspüleinrichtung nach Anspruch 3, bei der jedes Ringsegment S1 bis S10 aus mehreren Steinen (18) besteht, durch die sich jeweils mindestens ein Kanal (20, 22) erstreckt.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 4, bei der der Abstand zwischen benachbarten Kanälen zwischen 2 und 7 cm beträgt.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 5, bei der die Kanäle (20, 22) außen (am gaszuführseitigen Ende) gruppenweise oder insgesamt in eine gemeinsame Gasverteilkammer (24) einmünden.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 6, bei der der Durchmesser der Kanäle gleich oder kleiner als 1 mm ist.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 7, bei der die Kanäle (20, 22) rotationssymmetrisch über den Umfang der feuerfesten Auskleidung (14) des Rüssels (10, 12) angeordnet sind.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 8, bei der die Kanäle (20, 22) von Metallrohren gebildet werden, die in der feuerfesten Auskleidung (14) fest einliegen.
- Gasspüleinrichtung nach einem der Ansprüche 1 bis 9, bei der die Kanäle (20, 22) zur Horizontalen geneigt angeordnet sind.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4426368 | 1994-07-26 | ||
DE4426368 | 1994-07-26 | ||
DE29512335 | 1995-03-29 | ||
DE29512335U | 1995-03-29 | ||
PCT/EP1995/002956 WO1996003530A1 (de) | 1994-07-26 | 1995-07-26 | Gasspüleinrichtung im rüssel eines vakuum-entgasungsgefässes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0772695A1 EP0772695A1 (de) | 1997-05-14 |
EP0772695B1 true EP0772695B1 (de) | 2000-02-09 |
Family
ID=25938688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95928468A Expired - Lifetime EP0772695B1 (de) | 1994-07-26 | 1995-07-26 | Gasspüleinrichtung im rüssel eines vakuum-entgasungsgefässes |
Country Status (5)
Country | Link |
---|---|
US (1) | US5853658A (de) |
EP (1) | EP0772695B1 (de) |
AU (1) | AU3221895A (de) |
ES (1) | ES2143647T3 (de) |
WO (1) | WO1996003530A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2822849B1 (fr) * | 2001-03-27 | 2003-12-12 | Usinor | Enceinte de traitement sous vide notamment de decarburation d'acier |
DE202015003235U1 (de) | 2015-04-30 | 2016-08-02 | Beck U. Kaltheuner Feuerfeste Erzeugnisse Gmbh & Co. Kg | RH-Vakuumentgasungsanlage und Rüssel einer RH-Vakuumentgasungsanlage |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6050111A (ja) * | 1983-08-29 | 1985-03-19 | Tokyo Yogyo Co Ltd | Rh用浸漬管 |
JPS61281811A (ja) * | 1985-06-06 | 1986-12-12 | Sumitomo Metal Ind Ltd | 真空脱ガス装置用の下降管 |
JPS62142715A (ja) * | 1985-12-18 | 1987-06-26 | Tokyo Yogyo Co Ltd | Rh真空脱ガス装置の浸漬管 |
AU601602B2 (en) * | 1987-06-29 | 1990-09-13 | Kawasaki Steel Corporation | Method and apparatus for degassing molten metal utilizing RH method |
DE3911881C1 (en) * | 1989-04-11 | 1990-08-09 | Radex-Heraklith Industriebeteiligungs Ag, Wien, At | Fired gas flushing brick - for decarburisation of molten steel in vacuum vessel, comprises ceramic parallel tube lets |
-
1995
- 1995-07-26 AU AU32218/95A patent/AU3221895A/en not_active Abandoned
- 1995-07-26 WO PCT/EP1995/002956 patent/WO1996003530A1/de active IP Right Grant
- 1995-07-26 ES ES95928468T patent/ES2143647T3/es not_active Expired - Lifetime
- 1995-07-26 US US08/776,817 patent/US5853658A/en not_active Expired - Fee Related
- 1995-07-26 EP EP95928468A patent/EP0772695B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU3221895A (en) | 1996-02-22 |
US5853658A (en) | 1998-12-29 |
EP0772695A1 (de) | 1997-05-14 |
WO1996003530A1 (de) | 1996-02-08 |
ES2143647T3 (es) | 2000-05-16 |
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