Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1992-03-16
1993-11-23
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 1053, 266142, 266144, 266168, 373 80, F27D 1300
Patent
active
052640205
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention related to a smelting plant as set forth in the classifying portion of claim 1 and a method of operating such a smelting plant as set forth in the classifying portion of claim 18.
2. Discussion of the Background
A smelting plant of that kind is known for example from DE-A1 32 32 139. It includes two melting furnaces which are disposed in juxtaposed relationship and to which melting energy is supplied alternately by means of a heating arrangement in the form of arc electrodes. While the melting operation takes place in one melting furnace, the other furnace is tapped and re-charged and the waste gases from the furnace which is involved in the melting operation are passed through the other furnace, for preheating the fresh charge. That provides for more uniform utilization of the power supply and an increased level of productivity. In addition the heat content of the furnace waste gases which are produced in the melting and refining procedure is utilized for preheating the charge material of the respective other melting furnace and the fact that the waste gases are passed through the charge material means that the amount of dust produced and thus the loading applied to the dust removal arrangement which is at a downstream location are also reduced.
In order to assure that the gases flow with the maximum degree of uniformity through the material to be preheated and in order at the same time to prevent the gas conduit from becoming obstructed by charge material particles or spattered or splashed molten material, the furnace gases are taken off through the cover and introduced into the adjacent furnace vessel in the lower region of the casing thereof.
In the known smelting plant, the furnace waste gases cannot be used for preheating charge material in the initial phase of the melting procedure as in that phase the other melting furnace is being tapped, maintained and re-charged.
In addition the step of introducing the gases in the lower region of the wall of the vessel gives rise to problems because the opening which is required for that purpose is exposed to the effect of spattered or splashed molten material.
German utility model No 84 12 739 discloses a smelting plant with an arc furnace which includes a furnace vessel having a shaft-like charging material preheater which is arranged laterally on the furnace vessel and the interior of which, in a region adjoining its bottom, is communicated with the interior of the arc furnace through a connecting zone. In its upper region the charging material preheater has a closable charging arrangement for charging material and a gas outlet. A smelting plant of that kind permits the thermal energy of the furnace waste gases to be put to good use as long as the shaft-like charging material preheater is at least still partially filled. That advantage is lost at the end of the smelting phase and during the refining phase when the shaft-like charging material preheater is emptied, unless special steps are taken to ensure that charging material is also retained in the shaft-like charging material preheater, in that operating condition.
In a smelting plant of the kind set forth in the classifying portion of claim 1, the object of the invention is to permit preheating of metal charging material with the furnace gases of the furnace which is operating in the melting mode, and the coarse removal of dust from said furnace gases by charging material even during the initial phase of the melting procedure, in order to make better use of the heat content of the furnace waste gases and to reduce the total amount of dust involved. The invention seeks to make that possible without the opening for introducing the furnace gases of the other melting furnace having to be exposed to the effect of spattered or splashed molten material. The invention also aims to provide a method of operating such a smelting plant.
The smelting plant according to the invention is characterised by the features of claim 1. Advantageous configura
REFERENCES:
patent: 2805142 (1957-09-01), Arata
patent: 2805929 (1957-09-01), Udy
patent: 3655085 (1972-04-01), Aleck
patent: 4617673 (1986-10-01), Fuchs et al.
Ehle Joachim
Fuchs Gerhard
Fuchs Technology AG
Rosenberg Peter D.
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