EP1917114A1 - Refractory element with a channel formed from discrete bodies - Google Patents
Refractory element with a channel formed from discrete bodiesInfo
- Publication number
- EP1917114A1 EP1917114A1 EP07725997A EP07725997A EP1917114A1 EP 1917114 A1 EP1917114 A1 EP 1917114A1 EP 07725997 A EP07725997 A EP 07725997A EP 07725997 A EP07725997 A EP 07725997A EP 1917114 A1 EP1917114 A1 EP 1917114A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- channel
- bodies
- longitudinal direction
- element according
- ceramic material
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
- B22D41/186—Stopper-rods therefor with means for injecting a fluid into the melt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
Definitions
- the invention relates to an element of at least one refractory ceramic material having at least one channel extending within the element.
- element includes discrete components, such as cuboids, prisms, cones or the like, which are produced, for example, by casting, extruding or pressing in molds, but also locally produced elements such as floors, walls, ceilings, dams.
- the invention relates to those elements in which at least one discrete channel runs through which a treatment medium, usually a gas, optionally in combination with solids, can be passed.
- a treatment medium usually a gas, optionally in combination with solids
- gas purging plugs as are known from EP 0 329 645 A1, or plugs, the basic structure of which is described in EP 1 401 600 Bl.
- channel is a discrete channel that forms a so-called directed porosity, that is, the gas to be guided along the channel should be as accurately as possible in the longitudinal direction of the channel and not diffused laterally , as is known for example in elements with so-called reoriented porosity, which are constructed spongy and in which a treatment gas takes a more or less uncontrolled path from one pore to the next.
- Burn-out threads are coated with refractory material. After the thread has burnt out, the desired gas channel is created.
- a wire is tamped with mass. The wire is then pulled out, so that in its place a gas channel is formed.
- the above and other methods have basically proven.
- the disadvantage is that the channel can clog during operation, especially when surrounding refractory dissolves.
- the coarse-grained structure of the refractory material of the element is so far problematic.
- An uncontrolled change in the channel cross-section, up to its blockage, not only affects the functional properties of the associated gas purging plug (element), but also the associated secondary metallurgical treatment of a molten metal.
- the invention has for its object to provide a way to improve the reliability of a generic element with at least one channel and to expand the scope of related elements.
- the channel which usually has an inner cross-sectional area ⁇ 5mm 2 , often ⁇ 3mm 2 , in part ⁇ 1mm 2 , should not be formed directly in or through the refractory material of the element, but at least partially by ring or sleeve-shaped elements having a form separate channel wall.
- the channel is therefore formed by a plurality of discrete bodies in ring or sleeve shape, which are arranged one behind the other in the longitudinal direction of the channel.
- the "longitudinal direction" of the channel means the predominant flow direction of a gas guided through the channel, which does not necessarily have to be rectilinear, on the contrary: As will be described below, curved, meandering or other special courses of a gas channel are frequently desired.
- any courses of the channel can be formed, since the channel wall is not in one piece, but is formed from a multiplicity of individual wall sections (the bodies).
- adjacent bodies can be arranged exactly coaxial to each other, but also in any other assignment.
- the shape of the body itself may be quite different along the channel, as will be described below.
- the channel is formed between its ends with a closed wall; on the contrary: by the loose arrangement of bodies for the formation of the channel Tolerances and distances necessarily arise between adjacent bodies, which according to the invention, however, are desired in order to be able to form an individual geometry of the channel.
- the channel is bounded to the wall side to a considerable extent by said bodies, which protect the interior of the channel from the penetration of the surrounding refractory material when an associated element (for example, a gas purging plug) is produced.
- an associated element for example, a gas purging plug
- the wall surfaces of the body protect the channel from undesired penetration of the refractory ceramic material from which the element is formed.
- the inventive design of the channel allows precise gas guidance, a constant gas pressure and avoids malfunction.
- the invention then comprises an element of at least one refractory ceramic material having at least one channel extending within the element, the channel being at least partially formed by a plurality of discrete bodies in ring or sleeve shape, one behind the other in the longitudinal direction of the channel and each body is made of a refractory ceramic material different from the circumferentially adjacent refractory ceramic material of the element.
- At least individual bodies adjacent in the longitudinal direction of the channel can contact one another.
- the points of contact can be point, line or planar.
- at least one body, viewed in the longitudinal direction of the channel has a length which is greater than a maximum distance between two points lying on a plane perpendicular to the longitudinal direction of the channel and along the inner wall of the body.
- such bodies have the shape of a pipe section or a sleeve.
- embodiments are expedient in which the bodies are designed on the outside in such a way that they form a positive connection with the surrounding refractory material. These can serve radially projecting from the outer wall of a body body sections, for example in the form of pins, rings, knobs, anchors, etc.
- bodies of different lengths in the longitudinal direction of the channel, can adjoin one another.
- each individual body is basically irrelevant. It is crucial that adjacent bodies should form a common channel.
- the channel does not have to be closed on all sides (peripherally) by the body.
- slotted bodies or perforated sleeve-shaped bodies can also be used in the longitudinal direction of the channel.
- a possible internal cross section of the body is a circular cross section, as shown for example in Figure Ia.
- the inner cross-section can also be slit-like (rectangular), as sketched in FIG. 1b or triangular in accordance with FIG.
- Neighboring bodies can be connected to each other in terms of force but also in a form-fitting manner; It is also possible to articulate adjacent bodies together.
- compressible / deformable gaskets between adjacent annular or sleeve-shaped bodies are arranged.
- deformable elements may for example consist of graphite, which is at the same time refractory and does not burn out in the application of the element.
- a similarly acting alternative provides bodies that are formed at one end in the manner of a ball segment and at the other end have a corresponding, dome-shaped receptacle, so that corresponding adjacent body can intervene hingedly.
- the channel section of this body is at least end so enlarged that even with angular displacements of adjacent body, a continuous gas passage is formed.
- the single body may define a straight or curved channel section.
- the outer shape is arbitrary anyway.
- Individual bodies or groups of bodies can be assembled on a common carrier element. This applies not only to the production, but also to the application.
- a gas channel composed of individual elements After a gas channel composed of individual elements has been brought into the desired shape, it is backfilled (surrounded) with mass, as is generally known in the prior art.
- the wire or thread can then be removed again (after completion of the element); but it can also remain in the channel, so that then for the gas passage an annular channel is formed between the support member and the wall of the annular or sleeve-shaped body.
- the channel may extend from a first to a second surface portion of the element.
- gas purging pits it is known to form at least one gas distribution chamber, under or in the element, from which the gas passages run.
- channel geometries Due to the channel composed of individual bodies, arbitrary channel geometries can be created. These include: S-shape, helix, meander, knot, spiral, wave, involute.
- the bodies according to the invention consist of a refractory ceramic material. Suitable for this purpose are, for example: Al 2 O 3 , TiO 2 , MgO, ZrO 2 , SiO 2 , CaO or mixtures thereof.
- the bodies are made of finely divided raw materials, and preferably by pressing. This gives the bodies a high density, which in one embodiment is higher than the density of the refractory material of the element surrounding the bodies.
- the individual walls of the body are preferably gas-tight.
- the use of finely divided materials for the bodies and formation of the high-density bodies has the further advantage that a very smooth channel wall can be formed which provides advantageous flow characteristics for a gas passed therethrough.
- Figure 3 A longitudinal section through a possible channel geometry
- Figure 4 A longitudinal section through a further channel geometry
- FIG. 10 designates in FIG. 1 an element made of a refractory ceramic material, which has a metal jacket 12 peripherally, which extends over a lower end face 10u of the refractory part of the element 10 and has a bottom 12b, into which a gas supply pipe 14 opens, between the bottom end surface 10u and the bottom 12b, a gas distribution chamber 16 is formed. Between the Gasverteilhunt 16 (the lower end face 1Ou) and an upper end face 10o of the ceramic part of the element 10 extends a designated 18 channel.
- the channel 18 is formed of a plurality (here: schematically 10) sleeve-like bodies 20, wherein adjacent body 20 each slightly offset from each other, so that overall results in a slightly curved shape for the channel 18.
- Adjacent bodies 20 are at least in one place against each other, although this is not absolutely necessary.
- deformable bodies 21, here graphite sealing rings can be arranged.
- the second body from below has on its outer wall on two radially projecting armature 23, which in the refractory material of the body 10 firmly. It will be understood that instead of the illustrated one channel 18, a plurality of channels may pass through the body 10. In that regard, the representation of the element 10 and the channel 18 also not to scale.
- FIGS. 1a, 1b and 1c show in plan view possible cross-sectional areas of the bodies 20, as described above.
- FIG. 2 shows a frustoconical gas purging plug, with a gas feed line 14 opening into a gas distribution chamber 16 which is formed in the body 10.
- 4 channels 18 are shown here, and only schematically (without the individual bodies 20).
- the left channel 18 is similar to the channel 18 in Figure 1.
- the channel disposed to the right is formed with a kind of "knot", whereby an additional penetration protection against penetrating molten metal is created.
- the second channel from the right has a double, opposite curvature in the lower part, which also fulfills the function of a break-through protection.
- the channel shown on the right in the figure is designed meandering its middle section.
- each channel 18 can correspond to that according to FIG. 1 or according to FIG. 3, wherein the individual bodies 20 according to FIG. 3 have different shapes.
- the lowest body corresponds to
- the body 20 according to FIG. 1 has a much shorter but wider part with an approximately trapezoidal cross-section, in the longitudinal direction of the channel 18, which is adjoined by an S-shaped curved body, which in turn is followed by a body 20.
- the cylindrical outer wall 20a has an annular circumferential flange 20b, which forms a kind of reinforcing anchor for fixing the body 20 in surrounding refractory material.
- This purpose is also the formation of the body with trapezoidal cross-section and increased outer diameter relative to adjacent bodies.
- Each body is again designed sleeve or annular, so that a total of a continuous inner channel 1 8, is formed here with a double S-shape.
- these were successively threaded onto a nylon thread 22, which extends through the channel 18. Once an associated refractory ceramic element has been created, the nylon thread 22 may be removed or burned out.
- the bodies of Figure 4 are also sleeve-like in their basic form, but at one end have a projection 2Ov in the manner of a ball segment and at the other end a corresponding dome-like depression 20g. Adjacent bodies 20 can be arranged angularly offset from one another. At the same time, the channel 18 of each body 20 of larger cross-section is formed on the projection 2Ov, so that even if the bodies 20 are not exactly aligned with each other, there is a continuous channel for gas guidance.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL07725997T PL1917114T3 (en) | 2006-07-08 | 2007-06-14 | Refractory element with a channel formed from discrete bodies |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006031687A DE102006031687B4 (en) | 2006-07-08 | 2006-07-08 | element |
PCT/EP2007/005223 WO2008006436A1 (en) | 2006-07-08 | 2007-06-14 | Refractory element with a channel formed from discrete bodies |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1917114A1 true EP1917114A1 (en) | 2008-05-07 |
EP1917114B1 EP1917114B1 (en) | 2008-12-24 |
Family
ID=38476917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07725997A Active EP1917114B1 (en) | 2006-07-08 | 2007-06-14 | Refractory element with a channel formed from discrete bodies |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1917114B1 (en) |
AT (1) | ATE418407T1 (en) |
DE (2) | DE102006031687B4 (en) |
ES (1) | ES2317642T3 (en) |
PL (1) | PL1917114T3 (en) |
WO (1) | WO2008006436A1 (en) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6033163B2 (en) * | 1980-10-30 | 1985-08-01 | 新日本製鐵株式会社 | Converter bottom blowing tuyere hot exchange method |
DE3510708A1 (en) * | 1985-03-23 | 1986-09-25 | Fried. Krupp Gmbh, 4300 Essen | Tuyere arrangement of a metallurgical vessel |
JPS6311613A (en) * | 1986-06-30 | 1988-01-19 | Tooa Steel Kk | Construction of bottom blowing tuyere for electric furnace |
ES2021894B3 (en) * | 1988-02-19 | 1991-11-16 | Veitscher Magnesitwerke-Actien-Gesellschaft | GAS SINK. |
DE4207881C1 (en) * | 1992-03-12 | 1993-08-26 | Veitscher Magnesitwerke-Actien-Gesellschaft, Wien, At | Gas flushing brick for melting vessels - has gas channels slightly inclined to vertical to ensure that gas flow is towards centre of vessel despite non-vertical fitting of brick inside vessel bottom |
DE19542446C2 (en) * | 1995-11-14 | 1998-05-28 | Doetsch Geb Richard Marie Luis | Fireproof molded panels with gas routing channels |
CA2447072C (en) * | 2001-06-12 | 2010-08-10 | Vesuvius Crucible Company | Stopper for reliable gas injection |
-
2006
- 2006-07-08 DE DE102006031687A patent/DE102006031687B4/en not_active Expired - Fee Related
-
2007
- 2007-06-14 DE DE502007000327T patent/DE502007000327D1/en active Active
- 2007-06-14 WO PCT/EP2007/005223 patent/WO2008006436A1/en active Application Filing
- 2007-06-14 EP EP07725997A patent/EP1917114B1/en active Active
- 2007-06-14 PL PL07725997T patent/PL1917114T3/en unknown
- 2007-06-14 ES ES07725997T patent/ES2317642T3/en active Active
- 2007-06-14 AT AT07725997T patent/ATE418407T1/en active
Non-Patent Citations (1)
Title |
---|
See references of WO2008006436A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1917114B1 (en) | 2008-12-24 |
DE502007000327D1 (en) | 2009-02-05 |
WO2008006436A1 (en) | 2008-01-17 |
ATE418407T1 (en) | 2009-01-15 |
DE102006031687A1 (en) | 2008-01-17 |
PL1917114T3 (en) | 2009-04-30 |
DE102006031687B4 (en) | 2008-08-14 |
ES2317642T3 (en) | 2009-04-16 |
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