Submerged arc furnace with vertically movable frame

Details Submerged arc furnace with vertically movable frame Submerged arc furnace with vertically movable frame

1996-07-11

1998-03-17

Hoang, Tu B.

Industrial electric heating furnaces

Arc furnace device

Electrode support

373 52, 373 94, H05B 712

Patent

active

057295697

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a submerged arc furnace with open slag bath, in particular for melting powdery batches, having a vertically movable frame which is arranged above the furnace closed by a cover. An electrode mount and an electrode charging device are arranged on the frame. The invention further relates to a device for sealing the electrode passage openings in the cover of a submerged arc furnace.
2. Description of the Prior Art
Electrodes in reduction furnaces are consumed at the electrode tip and must be charged during operation. Such a charging device for the electrodes of electric furnaces, having a double-acting hydraulic drive consisting of a piston/cylinder arrangement and intended for pushing the electrodes through the contact mount is disclosed, for example, by DE AS 1 440 991. The charging device which is disclosed by this document, and also the electrode mount, are fastened on a frame which is borne by an electrode winch. In this document, means are indicated with which shock-free and speed-regulating charging of the individual electrodes through the electrode mount can be carried out uniformly during the entire lowering operation. A simultaneously controlled lowering of the electrodes is as infrequent as a reliable sealing of the electrode passages through the cover.
The document EP 0 093 070 B1 discloses a sealing system for electrodes, in which an annular stuffing box is pressed onto the outer surface of the electrode. Furthermore, a chamber is provided which encompasses the electrode and can be loaded using compressed air. The entire sealing ring is screwed fast to the furnace cover and thus cannot be easily detached from the cover.
The document DE OS 24 55 202 discloses a main ring seal for use in conjunction with an arc furnace which has a furnace cover of fire-resistant material, in which excessively filled openings are provided. The main ring seal is supported above, and independently of, the fire-resistant furnace cover using a support structure. For this purpose, pivotable connecting elements are used which permit a lateral movement and an offset of the main ring seal with respect to the furnace cover. Furthermore, the main ring seal can be sealed off in relation to the furnace cover using an adjustable cylindrically designed part. An annular cover seal is provided on the cover and is dimensioned such that it can be adjusted in a telecoping manner relative to the lower cylindrical part with close contact, the contact being improved further by means of a resilient element. This complicated construction only permits a cover change which involves a high degree of outlay.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a submerged arc furnace and a sealing device for the electrode passage openings in the cover, both of which guarantee reliable control of the electrode movement and with which, in a maintenance-friendly manner, an increase in the useful operational time may be achieved.
According to the invention, piston/cylinder arrangements are connected to the frame to which the electrode mount and the filling device are fastened. The piston/cylinder arrangements are supported on a stationary regulating platform. Using the movement of this frame, the electrodes, as a rule 3 are used, are moved simultaneously. The filling and remounting of each individual electrode are achieved using the clamping rings in combination with the mount. The simultaneous regulation of all three electrodes is possible in the case of submerged arc furnaces which operate with an open slag bath. Such furnaces are used in the processing of dusts or similar raw materials. In this case, the powdery batches are preferably charged via hollow electrodes. The remaining charging material, predominantly coke and additives, is charged via charging pipes onto the hot, liquid slag and floats on the slag. The slag surface and the batch surface have, in this case, no noticeable unevenness.
The electrode passages through the

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patent: 4238634 (1980-12-01), Krogsrud
patent: 4292460 (1981-09-01), Frolov et al.
patent: 4295001 (1981-10-01), Britton
patent: 4357485 (1982-11-01), Lamarque
patent: 4759032 (1988-07-01), Willis

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