DE7835461U1 - SEALING DEVICE FOR FEED INTO CLOSED ELECTRIC MELTING FURNACES - Google Patents

Description

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Device for feeding charge into closed electric melting furnaces.

The invention relates to a device for feeding charge into closed electric melting furnaces.

With closed electric melting furnaces for the production of Ferro alloys, pig iron and carbide are the raw materials usually taken from the furnace from the silo or silos above fed by means of pipes, which merge into so-called charging shafts, which lead down through the vault into the furnace. Care is taken to keep the feed pipes and feed chutes filled with raw materials at all times will. There is thus a system in which there is always feed in the pipes and shafts and the feeding of the feed into the furnace is directly determined by its consumption in the furnace.

The disadvantage of this system is that you can not close the furnace completely gas-tight because the feed pipes and Shafts are connected to the atmosphere. As a result, not only do toxic CO gases escape, but also Explosive fires can occur if air enters the system.

Those parts of the feed chutes which protrude into the furnace also suffered from great thermal stress and wear exposed. They therefore usually have to be water-cooled. However, any water leaks are difficult to spot. There is therefore a risk that water can enter the furnace and cause accidents and damage.

Another well-known way of introducing charging into a closed furnace would be the intermittent feeding via two locks, e.g. of the slide type or other known ones Types. With such a system, however, CO gas would flow from the furnace into the space between the two slides

pour up when the sentence; is introduced into the furnace. at This process therefore also creates problems because of the CO gas, which can lead to poisoning and explosions.

The invention relates to a valve device that has a gas-tight Forms connection between the feed pipes and the gel vault and at the same time a batch-wise feed j allowed in the oven.

The sealing device according to the invention is essentially characterized in that a hollow cylinder-like rotary body 4 with a passage 7 in the jacket is rotatably received in a housing 3 with an outlet Io to the melting furnace and with an inlet 9 for the supply of charge, that the lower part of the housing 3 is designed as a bearing shell for the rotary body 4 coupled to a drive, the inner diameter of which corresponds to the outer diameter of the rotary body 4 and which has a maximum semicircular shape in cross-section, and that the passage 7, inlet 9 and the outlet Io provided on the bearing shell are designed and are arranged to one another so that inlet 9 and Aaslaß Io are always shielded from one another by the rotary body 4.

Since the rotation body is not firmly attached to a continuous Axle is mounted, but rests with its own weight on the lower semi-cylindrical part of the valve housing, a practically complete seal is achieved. There is no risk of cluttering the system or disrupting the rotation, if feed particles or lumps should get between the rotating body and the lower part of the valve housing. If this were to happen as an exception, the rotating body would simply lift itself up and then return to its starting position after leading down obstacles into the furnace. The entrainment of obstructing particles or lump occurs when the opening of the body of revolution takes the place of the outside of the body of revolution material arrives and this gripping into the interior of the rotating body a-auftakes.

An example of the implementation of the invention can be seen from the attached schematic Figures 1 and 2, which a section through the valve device according to the invention show in two different positions.

“In the figures, 1 denotes the furnace vault. 2 deu-cet the

Implementation of the feed shaft through the vault. I.

3 is the valve housing, its lower part as a lying

Half-cylinder is designed. 4 is a hollow cylinder-like body of revolution, the outer diameter of which corresponds to the inner diameter of the lower part of the housing 3. Through the! Support of the rotating body on the designed as a bearing shell! O-designed lower part of the housing and by the arrangement of the passage 7 to the rotary body and the inlet 9 and the outlet Io on the housing is a practically complete m sealing between the upper part of the furnace roof and the on - let 9 and the tube 8 for the Infeed of charge reached.

The housing is generally designed to be closed at the top. For special cases, however, it can also be open at the top. The closed design has the advantage of a special good sealing. The open design has the advantage of easier access to the rotating body. In the Open design, if there is no pipe feed for correction material, this can be done at any point from (ι can be added above. However, the addition is preferred of corrective material to the housing before the passage 7 of the rotating body 3 reaches its upper position.

With regard to the arrangement of the feed pipe 8, such a Angle of incidence against the wall of the rotating body 4 provided that the charge remains lying as long as it is not the passage 7 opposite.

|; The inlet 9 on the housing 3 or on the feed pipe 8 can partially

;> in the area of the bearing shell or above the bearing

; ' shell open adjacent to the housing. At each of these

! '■. Orders is a distance between the outside diameter of the

k body of revolution on the one hand and the angle between the housing

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and the top of the feed pipe 8 on the other hand, so that as a result of this distance a certain additional amount Charging material can accumulate during the rotation of the rotating body and when the rotating body is refilled can get into its interior. This distance also prevents jamming from occurring when the lower edge of the passage 7 reaches the upper filling position during the filling process.

It makes sense to turn the rotary body in only one direction and thereby the passage 7 from the outlet Io to the inlet to take the shorter route, because this avoids jamming with the load.

When the rotating body 4 is rotated by the power source 6 through the lever 5, the passage 7 moves coming from the outlet Io upwards to the inlet 9 and takes charging material from the charging pipe 8 coming at the inlet 9 on. The receiving space in the rotating body is larger than the load stored at the inlet 9. the post-conveyed during the rotation of the feed pipe 8 Amount also does not reach such an extent that the seal is carried away from the casing of the rotating body in interfering amounts would be.

During the rotation the outlet Io is through which in itself the charge is discharged into the furnace, sealed by the wall of the rotating body 4 after the passage 7 the Opening Io has passed. After the rotary body 4 has been rotated from the position shown in FIG. 2 by about 120 ° is, the passage 7 is in front of the inlet 9. Upon further rotation, both the outlet Io and the inlet 9 are from covered the coat. After the passage 7 has reached the outlet Io, feed is delivered to the furnace, and the Air in the "rotating body 4" is with the CO from the furnace Incineration fed. The rotating body 4 is burned with Gas filled. When the rotary body 4 reaches its filling position, no combustible gas can reach the feed pipe 8.

The device according to the invention allows correction material to be fed into the furnace both manually and automatically and then to supply quickly when the passage 7 turns straight up. One can thus even with closed Furnace without switching it off, correction material directly respectively"

The type of drive of the rotary body of the sealing device is not essential to the invention. The rotary motion can be done gradually. If it is carried out in stages, it is advantageous to adjust the extent of the stages of the Rotation to be dimensioned so that the passage 7 on the rotating body to lie as precisely as possible over the outlet Io comes.

Claims (6)

• · · • i · PATENTANWALT DR.-ING. LOTTERHOS "000 FRANKFURT (MAIN) I LICHTENSTEINSTRASSE 3 TELEPHONE: (0611) 555001 TELEGRAMS! LOMOSAPATENT LANDESZENTRALBANK 50007149 POSTSCHECK-ACCOUNT FFM. 18Β7-60Θ FRAHKFURT (MAIN), November 28th 19 Elkem-Spigerverket a / s Middelthuns gate 27, N Oslo 3 claims 1) Sealing device when feeding feed into closed electric melting furnaces, characterized, that in a housing (3) with an outlet (Io) to the melting furnace and with an inlet (9) for the supply of charge a hollow cylinder-like rotating body (4) is rotatably received with a passage (7) in the jacket that the lower part of the housing (3) as a bearing shell for the is formed with a drive coupled rotary body (4), the inner diameter of which corresponds to the outer diameter of the rotary body (4) and which has a maximum semicircular shape in cross-section, and that the passage (7), inlet (9) and the outlet (Io) provided on the bearing shell are designed and arranged in relation to one another are that inlet (9) and outlet (lo) always through the rotating body (4) are shielded from each other. 2) Sealing device according to claim 1, characterized in that that a further inlet for the supply of correction material is provided on the housing (3). 3) Sealing device according to claim 1 or 2, characterized in that that the housing (3) is open at the top. 4) Sealing device according to claim 1, 2 or 3, characterized characterized in that the inlet (9) is partially in the region of the bearing shell or above it delimiting the bearing shell Housing (3) opens. 5) Sealing device according to claim 1, 2, 3 or 4, characterized in that the rotary body (4) only in one direction of rotation is rotatable and the passage (7) from the outlet (Io) takes the shorter route to inlet (9). 6) Sealing device according to claim 5, characterized in that that the rotary movement takes place gradually.