Industrial electric heating furnaces – Arc furnace device – Charging or discharging
Patent
1990-10-25
1992-10-06
Reynolds, Bruce A.
Industrial electric heating furnaces
Arc furnace device
Charging or discharging
373 78, 373 79, 373 81, 373 83, 373 84, 373 86, 373 76, 373 94, 373100, 373106, F27D 1300
Patent
active
051538946
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a smelting plant.
A smelting plant of that kind is disclosed in German utility model No 84 12 739.
In the known smelting plant the charging material is charged through a shaft-like charging material preheater into a metal sump present in the furnace vessel. In that situation the problem arises that, after the tapping operation and re-igniting the electric arc, the electrical energy input is restricted by the bath temperature which is high at that time. The residual sump which remains in the furnace vessel after the tapping operation cools down so little in that brief period of time that only a low level of electrical energy can be input in order to prevent the bath from overheating. Therefore the power available for the smelting operation cannot be utilized in the initial phase so that the smelting time is correspondingly increased.
For the purpose of reducing the period of time involved in the smelting procedure and for the purposes of protecting the furnace walls, it is desirable after each tapping operation to introduce the charging material not just at the side of the furnace vessel at which the charging material preheater is disposed, but in such a way as to be distributed over the entire cross-section of the furnace, or specifically and deliberately on the side of the furnace vessel which is in opposite relationship to the charging material preheater.
Problems of space arise when the content of a scrap metal basket is charged directly into the furnace vessel, due to the shaft of the charging material preheater which is disposed on one side of the furnace vessel, and the electrode lifting and pivoting apparatus which is disposed on the other side of the furnace vessel. Furthermore such a charging operation involves environmental pollution.
The object of the present invention is to provide a smelting plant wherein, without being impeded by the shaft, the charging material can be introduced by means of a scrap metal basket into the entire cross-section of the furnace, or specifically on the side of the furnace vessel which is in opposite relationship to the charging material preheater. The invention further seeks to provide that the charging operation involves the minimum level of environmental pollution.
That object is attained by the features of this invention and by other advantageous configurations in accordance with the invention.
Accordingly the walls of the charging preheater, in the lower region of the preheater, up to the level of the upper edge of the furnace vessel, are formed by a part of the vessel wall against which the column of charging material can laterally bear, and in the region thereabove, by the walls of a shaft fixed in a holding structure. The holding structure carrying the shaft, and the furnace vessel, are movable relative to each other. The furnace vessel cover is preferably releasably fixed to the holding structure. It then forms a structural unit with the shaft. In that way, the shaft of the charging material preheater can be removed simultaneously with the furnace cover when it is removed, and sufficient space is provided for charging material directly into the furnace vessel.
Subdividing the preheater into an upper shaft fixed in a holding structure and lower portion formed by a part of the vessel wall affords further options which are advantageous in regard to the charging and smelting procedure, particularly when the shaft is structurally combined with the cover. The shaft itself can be utilized for specifically charging material into the furnace vessel, by virtue of a horizontal relative movement as between the furnace cover and the furnace vessel, while environmental pollution can be minimized in the charging operation, by virtue of the furnace vessel being substantially covered over by the cover. The horizontal relative movement can be a pivotal or a linear movement of the furnace vessel cover and/or a linear movement of the furnace vessel. The spacing between the upper edge of the vessel and the lower edge of the vessel cover, which is requir
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Ehle Joachim
Fuchs Gerhard
Fuchs Technology AG
Hoang Tu
Reynolds Bruce A.
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