Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Patent
1998-11-16
2000-10-10
Kastler, Scott
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
266216, C21C 7072
Patent
active
061298891
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention concerns a gas purging bottom for metallurgical vessels, particularly for the steel production.
In the field of metallurgy, there are numerous systems for introducing gases (possibly in combination with pulverized solids) into molten baths.
So-called gas purging plugs in the form of discrete gas purging elements are known. These are embedded into the wall or the bottom of a metallurgical vessel (ladle, tundish, converter, evacuation vessel, etc.). There are various structural shapes: having directed or undirected porosity (for example EP 0 521 371 B1), so-called gas purging plugs with slitlike channels, so-called gas purging plugs with crossed channels (for example DE 37 27 938 C1), etc.
Furthermore, gas purging devices are part of the prior art, which are integral components of a bottom or a wall of a metallurgical vessel.
According to AT 398 632 B, rodlike bodies are embedded into the refractory hearth building material in the region of the gas outlet openings of a gas distribution chamber at the bottom, which consist of a porous material or of a material, the thermal expansion behaviour of which is different from that of the hearth building material so that in operation (with corresponding heating) "expansion cracks" or "slits" occur along which the gas may flow. Disadvantageous is that the gas flow quantity can only be controlled with difficulties.
Also DE 37 42 861 C1 describes a type of a gas purging bottom, according to which gas is conducted through a porous refractory lining. Here too, controlling the gas flow along the bottom having an undirected porosity is at most empirically possible.
The invention further develops the basic idea of the above-mentioned state of the art (formation of a gas purging device as an integral component of a refractory lining of a metallurgical vessel) and provides a gas purging bottom for metallurgical vessels, having a directed porosity, which is formed within a portion of or the whole refractory lining of the vessel. Preferably the directed porosity (in the form of channels, slits or the like) is to be formed in situ within the refractory lining and at the same time to be in fluid connection to a gas supply pipe, in order to be able to introduce purposefully and reproduceably a controllable gas quantity into a molten metal bath over a purposefully adjustable area with an exactly predeterminable pressure.
With that the following modifications and new possibilities, compared to the state of the art mentioned at the beginning, may be provided:
The bottom or the wall of the metallurgical vessel can be formed in situ (externally or on site) with a gas purging device.
The type and size of the gas purging device may be varied nearly arbitrarily.
The area over which gas is injected into the molten bath may be adjusted as well as the quantity of the gas.
The refractory lining, including the gas purging device, may be prefabricated totally or partly as prefabricated part(s).
The type of the directed porosity (slits, cylinder, etc.) is adjustable arbitrarily.
Upon war, a partial repair is possible.
A gas distribution chamber may be formed as component of the refractory lining or outside the said lining (for example as part of the metallic casing of a metallurgical vessel).
A constant purging cross section may be achieved by a special geometry of the purging regions formed within the refractory material, even with advanced erosion of the refractory material.
In its most general embodiment, the invention concerns a gas purging bottom for metallurgical vessels having a monolithic refractory ceramic lining, having channels formed therein by chemical or physical processes, which channels are formed at their end related to an adjacent bottom of the vessel for direct or indirect fluid connection to a gas supply pipe and terminate at their other end within the corresponding outer layer of the refractory ceramic lining.
Here, the term "channel" is to be understood in its most general meaning, which is not limited in its geometry, thus includes tubelike, slitl
REFERENCES:
patent: 5225143 (1993-07-01), Labate II, et al.
patent: 5423521 (1995-06-01), Stover et al.
Dosinger Klaus
Dott Karl-Heinz
Hammerer Walter
Heiligenbrunner Michael
Reiterer Franz
A. Earley John F.
A. Earley III John F.
Kastler Scott
Veitsch-Radex Aktiengesellschaft fur Feuerfeste Erzeugnisse
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