EP0678584B1 - Installation pour insuffler du gaz dans les parois d'un récipient métallurgique - Google Patents

Installation pour insuffler du gaz dans les parois d'un récipient métallurgique Download PDF

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Publication number
EP0678584B1
EP0678584B1 EP95100728A EP95100728A EP0678584B1 EP 0678584 B1 EP0678584 B1 EP 0678584B1 EP 95100728 A EP95100728 A EP 95100728A EP 95100728 A EP95100728 A EP 95100728A EP 0678584 B1 EP0678584 B1 EP 0678584B1
Authority
EP
European Patent Office
Prior art keywords
gas
gas purging
inserts
purging
insert
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
Application number
EP95100728A
Other languages
German (de)
English (en)
Other versions
EP0678584A1 (fr
Inventor
Alfred Ing. Reiterer
Günther Ing. Nemecz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Veitsch Radex GmbH and Co OG
Original Assignee
Veitsch Radex GmbH and Co OG
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Filing date
Publication date
Application filed by Veitsch Radex GmbH and Co OG filed Critical Veitsch Radex GmbH and Co OG
Publication of EP0678584A1 publication Critical patent/EP0678584A1/fr
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Publication of EP0678584B1 publication Critical patent/EP0678584B1/fr
Anticipated expiration legal-status Critical
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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
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/48—Bottoms or tuyéres of converters
    • 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
    • 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

Definitions

  • the invention relates to a gas purging device for the wall Installation in a metallurgical melting vessel with the Features of the preamble of claim 1 as they arise from the DE 37 16 388 C1 results.
  • Several sections of the well-known Gas purging stones are switched on one after the other in order to Increase the service life of the gas purging plug as a whole.
  • metallurgical melting vessel includes such subsumed metallurgical vessels in which metal melted or liquid metal is treated.
  • Such individual gas purging stones can both in the floor like in the wall area of a metallurgical melting vessel to be built in. This is usually done using a so-called perforated brick; but also the direct installation of a gas purging plug belongs in a monolithic lining the state of the art.
  • the main types of sink are the so-called joint washers, Sink blocks with “undirected porosity” and sinks with “directed porosity”.
  • the gas is supplied to the joint washer over an annular gap between a dense ceramic Body and the enveloping metal jacket.
  • Sink stones with so-called “undirected porosity” are marked through a refractory material of open porosity, through that the purge gas is carried.
  • Gas purging stones with "directed Porosity” are characterized by a variety of Small diameter channels in a dense refractory Matrix, with gas transport along the channels he follows.
  • DE 39 11 881 C1 is a variant of a gas purging plug known with directed porosity, in which the channels (directed pores) are formed by tubes that are called independent parts after the gas purging plug burns in accordingly prepared through channels glued in or are mortared.
  • This gas purging plug known from DE 39 11 881 C1, is said to be in particular in a vacuum vessel for carrying out an RH, DH or RH-OB degassing process can be used.
  • the installation takes place on the wall side above the so-called Proboscis of the vacuum vessel.
  • Gas purging stones for the are therefore called as so-called Slot washer designs, that is, the directed pores have a slit shape and not an annular shape like that Tubes on.
  • the surface tension of the molten metal is usually so large that infiltrations into the slit-shaped channels are virtually excluded. This also applies if the gas supply is switched off.
  • the purging gas then appears in larger quantities Bubbles and low pressure in the steel column and flows the inner wall of the proboscis and not in the center of the molten metal up.
  • the problem underlying the invention therefore exists in providing a gas purging device places that are even when installed on the wall Ensures gas supply in the molten metal, if possible deep into the molten metal, so that a homogeneous Gas distribution in the molten metal is achieved.
  • the invention is based on considering that this goal will be achieved can by spacing several gas purging stones can be arranged via which the treatment gas is different can be inserted deep into the molten metal.
  • a gas purging insert can be designed in this way be that the gas fed into the molten metal immediately after exiting the gas purging insert on the wall side flows at the top, while another gas purging insert is designed in this way is that the gas goes deep into the molten metal becomes.
  • Additional gas purging inserts can be used in the area between the two aforementioned gas purging inserts with gas load.
  • the invention relates then a gas purging device for wall-side installation into a metallurgical melting vessel, such as a vacuum vessel Implementation of a RH, DH or RH-OB degassing process according to claim 1.
  • the gas purging device consists of a base body a refractory, ceramic material.
  • Either the gas purging inserts have the same design (Structural) structure, but a different one Cross-sectional area for the gas outlet at the gas outlet end.
  • the gas enters the gas purging plug with a larger one Cross-sectional area with lower flow velocity than from a gas purging insert with a smaller cross-sectional area. Accordingly, the treatment gas penetrates more or less deeply the molten metal.
  • the gas purging inserts are structurally (constructively) different built up.
  • a gas purging insert can be used undirected porosity and a gas purging insert with directed Porosity are formed. Starting from the same The gas purging plug then becomes the gas supply quantity and the same gas pressure with undirected porosity the treatment gas with less Press the metal melt as the gas purging insert directed porosity.
  • gas purging inserts with different amounts of gas or with gas to load different pressure. So both structurally identical as structurally different Gas purging inserts lead to different purging effects, if they have different gas pressure respectively different gas quantities are applied.
  • the Width usually does not exceed 1 mm.
  • the risk of marginalization described at the outset will thereby reduced or excluded by the Gas purging inserts are covered with sheet metal.
  • the gas purging inserts can be pre-assembled in a corresponding with a sheet metal jacket corresponding opening in the gas purging device are used and are used for example there set a mortar.
  • a gas distribution chamber can be used directly to the metal jacket of the gas purging insert connect, at the gas inlet end.
  • Such Gas distribution chamber for example, from a metal box can be individually formed for each gas purging insert be formed; but it is also within the scope of the invention a common gas distribution chamber for all gas purging operations to provide, which reduces the manufacturing costs becomes.
  • the Metal frame of the gas distribution chamber directly on the sheet metal jacket the gas purging inserts connects so that gas diffusions into the ceramic matrix material of the gas purging device be safely avoided.
  • the gas purging device is designed so that the individual Gas purging sections generally acted upon with gas at the same time are, however, that emerging from the individual gas purging inserts Gas differs due to the measures described above penetrates deep into the molten metal.
  • FIG. 1 shows a base body 10 made of a refractory, ceramic material that has a trapezoidal cross-section having.
  • Each of the gas purging inserts 14a-e is covered with sheet metal on the circumference, as Figure 3 shows, and at the gas inlet end (at 16) connected to a common gas distribution chamber 18, which extend over the entire base region 10b of the base body 10 extends and consists of a metal box that an opening 20 (with a neck) for the central gas supply (at 16).
  • the metallic closes Frame of the gas distribution chamber 18 directly to the sheet metal casing 22 so that between the gas supply (at 16) and the gas outlet end (at 24) a complete Gas tightness to the base body 10 is given, so that the gas cannot diffuse into the base body 10, but rather directly via the gas distribution chamber 18 and the Gas purging inserts 14a-e are guided into the molten metal can.
  • the gas purging insert 14a has an undirected porosity on, which is shown here schematically by hatching is.
  • the gas purging inserts 14b-e are so-called slot flushers, the gas purging insert 14b having five slots, the gas purging insert 14c four slots and the gas purging inserts 14d and e each have three slots.
  • the slot size (cross-sectional area of the slots) from gas purging insert 14b to gas purging insert 14e continuously decreasing.
  • the gas purging insert 14b not only has five slots, they are also formed with a larger cross section than the four slots of the gas purging insert 14c and the three slots of the gas purging insert 14d are smaller than the slots in the gas purging insert 14c, but larger than that of the gas purging insert 14e.
  • the gas flows evenly over the entire cross-sectional area at the gas outlet end of the gas purging insert 14a under relatively low pressure and flows largely only in the edge area upwards.
  • the increased number of slots and the larger opening width the slots in the gas purging insert 14b ensure that the Gas penetrates a little deeper into the molten metal than that Gas supplied via the gas purging insert 14a.
  • the penetration depth of the gas when using the gas purge is corresponding 14c again slightly larger than 14b, but smaller than with the gas purging insert 14d.
  • the gas purging insert 14e the has only three slots with a very small cross-section, ensures that from here the gas with the largest Depth of penetration into the molten metal can be performed.
  • the height of the vertically installed Base body 10, for example in an RH vacuum vessel that the gas supply is practically continuous the entire metal melt takes place and thus a uniform one metallurgical treatment can be done.
  • the steel speed in the inlet nozzle of the RH vacuum vessel kept the same across the entire cross-section, that is, they is approximately the same in the edge area as in the center.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Claims (5)

  1. Dispositif d'injection de gaz, à monter dans la paroi d'un creuset métallurgique, comprenant un corps de base (10), réalisé dans un matériau céramique réfractaire, et au moins deux tuyères à gaz (14a-e) disposées à une distance donnée l'une au-dessus de l'autre dans le corps de base (10) et pouvant, toutes en même temps être alimentées en gaz, et présentant l'une des caractéristiques que soit elles présentent une porosité dirigée ou non dirigée, soit parmi elles une tuyère à gaz (14a) présente une porosité non dirigée et une tuyère à gaz (14b-e) présente une porosité dirigée, caractérisé en ce que les tuyères à gaz (14a-e) sont conçues, à leur extrémité du côté de la sortie du gaz, avec une structure et une surface de section pour la sortie du gaz telles que le gaz injecté pénètre à différentes profondeurs dans le métal en fusion.
  2. Dispositif d'injection de gaz selon la revendication 1, dans lequel au moins une tuyère à gaz (14b-e) est conçue en forme de tuyère à fentes.
  3. Dispositif d'injection de gaz selon la revendication 1, dans lequel les tuyères à gaz (14a-e) sont enveloppées par une chemise métallique (22).
  4. Dispositif d'injection de gaz selon la revendication 3, dans lequel chaque tuyère à gaz, à son extrémité du côté de l'admission du gaz, est raccordée à une chambre de distribution de gaz, qui est formée par un caisson métallique relié de manière étanche au gaz avec la chemise métallique de la tuyère à gaz associée.
  5. Dispositif d'injection de gaz selon la revendication 3, dans lequel les différentes tuyères à gaz (14a-e), à leur extrémité du côté de l'admission du gaz, sont raccordées à une chambre de distribution de gaz commune (18), qui est formée par un caisson métallique, relié de manière étanche au gaz avec les chemises métalliques (22) des tuyères à gaz (14a-e).
EP95100728A 1994-03-25 1995-01-20 Installation pour insuffler du gaz dans les parois d'un récipient métallurgique Expired - Lifetime EP0678584B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4410289 1994-03-25
DE4410289A DE4410289C1 (de) 1994-03-25 1994-03-25 Gasspüleinrichtung zum wandseitigen Einbau in metallurgische Schmelzgefäße

Publications (2)

Publication Number Publication Date
EP0678584A1 EP0678584A1 (fr) 1995-10-25
EP0678584B1 true EP0678584B1 (fr) 1999-09-29

Family

ID=6513775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95100728A Expired - Lifetime EP0678584B1 (fr) 1994-03-25 1995-01-20 Installation pour insuffler du gaz dans les parois d'un récipient métallurgique

Country Status (7)

Country Link
US (1) US5622673A (fr)
EP (1) EP0678584B1 (fr)
JP (1) JPH07268441A (fr)
AT (1) ATE185167T1 (fr)
CA (1) CA2145360C (fr)
DE (1) DE4410289C1 (fr)
ES (1) ES2139100T3 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716388C1 (de) * 1987-05-15 1988-10-27 Radex Deutschland Ag Gasspuelstein

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3538498A1 (de) * 1985-10-30 1987-05-07 Didier Werke Ag Einduesvorrichtung fuer metallurgische gefaesse
DE3634448A1 (de) * 1986-10-09 1988-04-21 Didier Werke Ag Spueleinrichtung
US4858894A (en) * 1988-06-30 1989-08-22 Labate M D Stirring block with unidirectional grain structure having improved erosion resistance
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
DE4014509A1 (de) * 1990-05-07 1991-11-14 Didier Werke Ag Gasspueler
DE4201748C2 (de) * 1992-01-23 1994-01-05 Intocast Gmbh Verfahren zur Herstellung der feuerfesten Zustellung einer Gießpfanne

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3716388C1 (de) * 1987-05-15 1988-10-27 Radex Deutschland Ag Gasspuelstein

Also Published As

Publication number Publication date
CA2145360A1 (fr) 1995-09-26
ATE185167T1 (de) 1999-10-15
JPH07268441A (ja) 1995-10-17
ES2139100T3 (es) 2000-02-01
EP0678584A1 (fr) 1995-10-25
CA2145360C (fr) 2000-01-11
DE4410289C1 (de) 1995-03-16
US5622673A (en) 1997-04-22

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