Metallurgical apparatus – Process – Tuyere operation
Patent
1998-03-27
1999-06-29
Kastler, Scott
Metallurgical apparatus
Process
Tuyere operation
266217, 266225, 266265, C21C 528, C21C 552
Patent
active
059165120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns the field of metallurgy, more specifically, the processes and equipment for the post combustion of the atmosphere gases in smelting installations.
BACKGROUND OF THE INVENTION
The term "post combustion" is also known in the art as "after-burning". Therefore, these terms will be used interchangeably in this application.
A known method for post combustion of combustible components in the atmosphere in steel smelting vessels includes, feeding a jet of oxygen through an oxygen lance into the working space of the steel smelting unit (vessel) above the level of the metal in the vessel. In this method, the oxygen is fed through an apparatus having several rows of outlets in the form of jets which are aimed in a direction which is inclined with respect to the horizontal plane. The outlets are positioned at different levels in the vessel or furnace.
The apparatus includes an oxygen lance in the form of concentric pipes for the introduction of oxygen into the vessel, and for providing cooling water for the apparatus. At the discharge end of the lance apparatus and extending along its length, blowholes are positioned for the oxygen, in the form of jets, to exit the lance. Such a device is shown by E. D. Merker in his publication "Gas Dynamic Protection of the Blasting Zone in Steel Smelting Installations," Moscow, Metallurgiya, 1994, at page 20, FIG. 5.
A disadvantage of using the known device is the low efficiency seen in both the process of post combustion (after-burning) of the gases evolving in the steel smelting unit and in the creation of a gas dynamic curtain.
Due to the fact that the jets are discrete entities, the necessary intermixing of the furnace atmosphere with the oxygen jets does not take place. Moreover, when the known method and device are used, the heat evolving during the after-burning of the combustible components is not returned to the molten metal. The discrete feeding of oxygen in separate jets does not create a continuous gas dynamic curtain over the metal bath. Under these conditions the efficiency of after-burning of the combustible components will not exceed 50-60%.
U.S. Pat. Nos. 5,050,848 and 5,051,127 disclose an apparatus and method for post combustion over a molten bath using a swirling gas flow by means of one or more tuyeres directed at the surface of the metal.
U.S. Pat. No. 5,166,950 discloses a process for post combustion (after-burning) in a metallurgical furnace.
European Patent Publication 0 544 044 A1 discloses another post combustion process.
SUMMARY OF THE INVENTION
The method and apparatus of the present invention introduces an oxygen-containing gas, e.g., purity oxygen, into a metallurgical (e.g., steel) smelting (melting) vessel or furnace, above the level of the metal in a tangential swirling flow that is generally parallel to the bath portion of the furnace. The oxygen, thus introduced into the furnace, creates a continuous gas dynamic curtain of oxygen in the form of a fan-like jet above the metal. Introduction of the oxygen-containing gas is facilitated by means of a radiant injector having a diffuser with the cross-sectional shape of an inverted (relative to the metal in the furnace) funnel, wherein the oxygen-containing gas is introduced tangentially in a capped cylindrical portion located at and communicating with the open apex end of the funnel so that the gas swirls downwardly and outwardly from the funnel to form the dynamic gas curtain and react with the gases in the furnace (vessel) to effect post combustion (after-burning) of the combustible components of the furnace atmosphere at the inner surface of the diffuser thereby further heating the inner surface of the diffuser, which heat is radiated onto the metal contained in the furnace.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is schematic representation of the method and apparatus of the invention.
FIG. 2 is view taken along line 2--2 of FIG. 1.
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, the radiant injector apparatus of the invention i
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Search Report Jul. 6, 1995.
Arutyunov Vladimir Alexandrovich
Beremblum Gennady Borisovich
Breus Valentin Andreysvich
Chumarin Boris Anatolievich
Kozlov Dmitry Dmitryievich
Air Products and Chemicals Inc.
Kastler Scott
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