Industrial electric heating furnaces – Arc furnace device – Charging or discharging
Patent
1996-10-02
1999-03-23
Hoang, Tu Ba
Industrial electric heating furnaces
Arc furnace device
Charging or discharging
373 86, F27D 300
Patent
active
058870164
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a charging device for closed arc furnaces, and more particularly, to a charging device for closed arc furnaces having at least one electrode, especially for melting scrap, in which the charge is fed concentrically and evenly all around the electrode.
2. Description of the Prior Art
Evenly loading the charge into the melting furnace contributes significantly to the reliable operation of the melting aggregate. This is especially true in the case of low-shaft furnaces that are designed with relatively high shafts and thus relatively high stock columns. While arc furnaces that can be closed with a cover are usually charged by means of a basket, there are various ways to load the material to be melted, including the flux agent, into the furnace head.
For example, German Patent Number DE 31 07 016 C2 discloses an arc furnace for melting ferriferous material, which loads the charge into the furnace by means of a reversible conveyor and discharge devices located at its end with associated charging tubes. In order to deposit the charge material fairly evenly on the stock column, it is disadvantageously necessary to have several charging tubes leading to the furnace head to fill a furnace.
Furthermore, a device for charging electrothermal melting furnaces is known from German Patent Number DE 33 14 943 C2, in which the charge is fed through the furnace roof concentrically to the electrode and evenly around the electrode. An annular chamber is provided, having a bottom with at least one closable opening that leads to the furnace vessel, through which the charge can be fed into the upper furnace vessel. The bottom of this annular chamber can be turned separately, so that the charge falls through the then opened opening into the furnace. In the charging device disclosed in DE 33 14 943 C2, the charge material falls from a great height onto the bottom of the empty annular chamber and there, when the bottom undergoes a turning movement, is spread over it, relatively, with high abrasion. In addition, this complicated device requires the movement of large and heavy parts, so that it is suitable only for relatively light bulk materials.
SUMMARY OF THE INVENTION
Is is accordingly an object of the present invention to create a simple and readily maintainable charging device, within which a ferriferous charge, especially scrap, can be deposited in a furnace head at a predetermined quantity, time and location.
According to the present invention, conveyor devices are run in a protected position in an annular chamber above the furnace cover. Suspended on these conveyor devices are magnets, which pick up a ferriferous charge from a material feeding device and then, while traveling concentrically around the electrode, unload the charge at any desired predetermined point in the furnace head. For this purpose, a level measurement device is provided to measure the level of the charge in the furnace. The level measurement device, which is embodied in the form of probes, for example, is used to control the discharge location of the individual magnets. Control can be exercised in such a way that the most even possible discharge level is achieved. Of course, targeted level variations can also be used in directing the charge.
The material feeding device and the magnets transport the charge, especially scrap, in a careful manner until it is finally deposited on the stock line.
The annular chamber is embodied in such a way that the aggressive furnace atmosphere does not reach the conveyor devices. This is ensured by the fact that the passage from the annular chamber to the furnace head, i.e. the slot in the furnace cover, is sealed. Furthermore, as needed, the interior of the annular chamber is kept at a slight overpressure relative to the pressure in the furnace head. For this purpose, elements that close the slot are provided on the furnace cover in the region of the slot. For example, glide plates that are taken along by the individual conveyor devices as t
REFERENCES:
patent: 2518404 (1950-08-01), Townsend
patent: 3900117 (1975-08-01), Tuovinen et al.
patent: 4402083 (1983-08-01), Paskarbeit et al.
patent: 4490922 (1985-01-01), Gorodetsky et al.
patent: 4569057 (1986-02-01), Evangelista, Jr.
Hoang Tu Ba
Mannesmann Aktiengesellschaft
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