RU183770U1 - ORE-HOLDER ELECTRIC HOLDER SEAL ASSEMBLY - Google Patents

Abstract

The utility model relates to electrometallurgy and can be used in the design of arc ore thermal electric furnaces for conducting smelting reduction of metals and alloys from non-ferrous and ferrous metallurgy ores. The seal assembly of the electrode holder of the ore-thermal furnace contains a circular shell located on the roof sections of the furnace umbrella, inside of which there is fixed an air shut-off, facing an annular gap to the electrode holder, and an stuffing box laid on the air shut-off and pressed against it by an overlay. The objective of the proposed technical solution is to prevent the release of reaction gases into the atmosphere of industrial buildings, while the technical result is to increase the reliability of the furnace equipment. 4 s.p. f-ly, 2 ill.

Description

Technical field

The utility model relates to electrometallurgy and can be used in the design of arc ore-thermal electric furnaces for conducting smelting reduction of metals and alloys from non-ferrous and ferrous metallurgy ores.

State of the art

High-temperature recovery processes in ore-thermal furnaces occur with the release of gaseous smelting products from the furnace, which are removed from the furnace umbrella to gas treatment plants. In places of passage through the umbrella (umbrella roof) of the electrode furnace and all structural elements of the electrode holder, it is possible to knock out gases into the gaps between the umbrella and the electrode holder. To prevent gas being knocked out into the atmosphere of the production room, a seal assembly is installed in the places where the electrode holder passes through the roof of the furnace umbrella.

A device for sealing an electrode of an ore-thermal furnace (SU 613530, Н05В 7/12, publ. 23.06.78), comprising a fixed shell, covering the electrode and mounted on the pressure ring, a fixed shell mounted coaxially outside the movable shell and connected with a flexible sealing element with the arch of the furnace, and a sealing assembly located between the shells, the device being provided with beams connected rigidly to the stationary shell and movably through hinges with the furnace frame. The disadvantage of this solution is the design complexity associated with articulated devices and the presence of sealing materials between the movable sealing elements.

It is known that the electrode is sealed in the arch of an arc furnace (SU 743237, Н05В 7/12, publ. 25.06.80), consisting of a fixed cylinder and a loose sealant enclosed in an annular bag of refractory fabric, one end of which is fixed to a cylinder equipped with a cylindrical cover with loading hatches, rigidly fixed to the fixed element of the electrode holder, an annular bag of refractory fabric, placed outside the fixed cylinder, and its second end is attached to the lid. The disadvantage of this seal is the complexity of the seal design.

Known assembly of the electrode electrode of an electric arc furnace (SU 748920, Н05В 7/12, publ. 15.07.80), covering the electrode with a sectioned telescopic tube, the upper section of which is connected to the electrode holder and the lower to the arch, with each section having double walls, in a channel between which stiffening ribs connecting them are installed, at the ends of each mating sections holes are made for connecting the channels of adjacent sections, the channel of the lower section is connected to a pipe for supplying cooling gas, and in the upper wall th section there are longitudinal grooves of not more than half the length of the top section. The disadvantage of this technical solution is the bulkiness and complexity of the design.

Known assembly for sealing the electrode in the arch of an electric arc furnace (SU 752822, Н05В 7/12, publ. 30.08.80), equipped with an annular seal made of an elastic waterproof material suspended in a loop inside a U-shaped cavity and attached at one end to the end cylinder, and the second - to the inner wall of the box, and metal loads laid along the perimeter inside the seal loop. The disadvantage of this design is the lack of reliability of the seal, the presence of moisture in the seal elements.

A device for sealing the electrode holes of an electric arc furnace (SU 1066046, Н05В 7/12, publ. 07.01.84), comprising a housing mounted on the arch, covering the electrode with a gap in which loose ferromagnetic material is placed, to eliminate spillage during operation of the furnace and Bypassing the electrode in the upper and lower parts of the housing placed balls made of ferromagnetic material with a diameter greater than the maximum possible gap between the housing and the electrode. The disadvantage of this technical solution is the presence of bulk materials and incomplete, on the plane, closing of the balls, into the gaps between which it is possible to knock furnace gases into the atmosphere of the production site.

It is known that the electrode holder is sealed in the arch of a closed ore-thermal electric furnace (SU 1657916, F27D 1/00, publ. 23.01.91), containing a box with a filler, in which an annular knife covering the electrode is immersed, and nitrite is used as a filler to fill the furnace. nitrate mixture, while the box is filled with a mixture of 85-90 of its working volume. The disadvantage of this design is the use of a nitrite-nitrate mixture as a gate filler, which decomposes at temperatures above 600 ° C with the release of pollutants into the atmosphere of the production room.

Known sealing ring device (RU 2473029, F27B 3/10, H05B 7/12, F16J 15/00, publ. 20.01.13), a connecting device for connecting adjacent segments of the sealing ring device contains two support sections connected to each other by means of an intermediate bridge section extending along the entire length of the support sections, and wherein the support sections are at least partially tapering relative to one another. The sealing ring device contains at least two segments of the sealing ring, made with the possibility of their engagement with each other with the formation around the electrode of the sealing ring, each of the segments of the sealing ring has an upper end, a lower end, two side ends, an inner surface facing to the electrode, and the opposite outer surface. The disadvantage of this technical device is the design complexity.

Known sealing ring device for an electric arc furnace (RU 2357384, Н05В 7/12, F27B 3/10, publ. 27.05.09), a connecting device for connecting adjacent segments of the sealing ring device contains two support sections connected to each other by means of an intermediate a bridge section running along the entire length of the support sections. The sealing ring device contains at least two segments of the sealing ring, made with the possibility of their engagement with each other with the formation around the electrode of the sealing ring. The disadvantage of this design of the electrode seal is the lack of reliability of the seal and the complexity of the design due to the large number of movable elements.

Known electrode holder seal in the arch of the furnace, consisting of a sealing ring, a dry stuffing box seal, mounted on metal sections on the sections of the furnace roof (Shevchenko V.F. Design and operation of equipment of ferroalloy plants, M., Metallurgy, 1982, Fig. 21, C . 43).

By technical nature, by the presence of common features, this technical solution was adopted as the closest analogue.

The disadvantage of this technical solution is the complexity of the design of the support device of the packing.

Utility Model Disclosure

The objective of the proposed technical solution is to prevent the release of reaction gases into the atmosphere of industrial buildings.

The technical result is to increase the reliability of the furnace equipment.

The technical result is achieved by the fact that in the seal assembly of the electrode holder of the ore-thermal furnace containing a dry stuffing box seal, it is new that inside the circular shell located on the roof sections of the furnace umbrella, an air shutoff is fixed, facing the annular gap to the electrode holder, and a stuffing box laid on air cut-off and the pad pressed to it.

The claimed solution is complemented by private distinctive features that contribute to the achievement of a technical result. So, overlays in section has a triangular shape; the pad presses the stuffing box seal to the air shut-off with the help of studs and nuts; the packing is made of high temperature materials; the shell is made of a sheet of non-magnetic steel.

Brief Description of the Drawings

In FIG. 1 shows an electrode holder seal assembly (section), FIG. 2 shows the electrode holder seal assembly (plan).

The sealing assembly (Fig. 1, 2) consists of a circular shell 1 mounted on a roof section of an umbrella 2 made of a sheet of non-magnetic steel, inside the circular shell 1 there is an air shutoff 3 with a narrow annular gap facing the electrode holder 4. The air cutoff 3 is laid the packing 5 is made of high-temperature materials, which is pressed by a cover 6 with the help of studs 7 and nuts 8 to the air compartment 3.

Device operation

The sealing assembly works as follows: in the circular shell 1 mounted on the roof sections of the umbrella 2, an air cut-off 3 is installed, into which air is supplied under pressure, through a narrow annular gap facing the electrode holder 4, the air exits the cut-off 3 and prevents the passage of furnace gases from under the roofs of the umbrella 2 along the electrode holder 4. The stuffing box seal 5 made of high-temperature materials laid on the air cut-off 3 is pressed by the cover 6 using the studs 7 and nuts 8. The covers 6, having a triangular section in cross section the shape, they allow the gland seal 5 to be pressed in the vertical plane to the air cut-off 3 and the horizontal plane to the electrode holder 4.

The seal assembly is installed on the roof sections of the furnace umbrella at the passage of the electrode holder.

Comparing the existing designs of the seal assemblies of the electrode holders (electrodes) of the furnaces with the proposed technical solution, it should be noted that they have as common features:

- dry stuffing box seal;

and the difference from the existing design solutions:

- air cut-off installed on the roof sections of the umbrella;

- a dry stuffing box seal located above the air cut-off and pressed by a triangular lining to the air cut-off and to the electrode holder;

- there are no parts moving in space.

These differences allow us to conclude that the proposed technical solution meets the criterion of "novelty." Signs that distinguish the claimed method from the prototype, not identified in other technical solutions and, therefore, provide the claimed solution meets the criterion of "inventive step".

This technical solution has higher reliability, since the air cut-off is quite reliable in operation, and the presence of an oil seal increases the reliability of this technical solution.

This design of the electrode holder seal assembly does not have parts moving in space, which makes it more reliable when operating on an existing furnace.

Claims (5)

1. The seal assembly of the electrode holder of the ore-thermal furnace, containing a dry stuffing box seal, characterized in that it is made in the form of a circular shell located on the roof sections of the furnace umbrella, inside of which there is an air shut-off facing the annular gap to the electrode holder, and a stuffing box laid on the air shut-off and pressed to her overlay. 2. The seal assembly according to claim 1, characterized in that the patch in cross section has a triangular shape. 3. The seal assembly according to claim 1, characterized in that the patch is made with the possibility of pressing the stuffing box seal to the air cut-off with the help of studs and nuts. 4. The seal assembly according to claim 1 or 2, characterized in that the stuffing box seal is made of high temperature materials. 5. The seal assembly according to claim 1, characterized in that the shell is made of a sheet of non-magnetic steel.

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