RU2743943C1 - Method for sealing bath casing of ore recovery furnace with rotating bath and device for its implementation - Google Patents

Abstract

FIELD: building.

SUBSTANCE: invention relates to sealing a casing of a bath of an ore-reduction electric furnace with a rotating bath installed in the opening of a working platform of the furnace, and a method of sealing a casing of a rotating bath of an ore-reduction furnace. The seal contains a hinged metal shelf installed in the gap between the furnace bath and the furnace platform floor and fixed to the bath casing, and a circular metal beam mounted in the working platform floor with a tight support on the circular metal beam. On the outside of the bath, the metal shelf of the seal rests without a gap on a circular metal beam mounted in the floor of the working platform.

EFFECT: reduction of the amount of gases in the air of the working area of ​​industrial buildings during discharge of the melt from the furnace, reduction of abrasive wear of the metal structure of the seal and increased service life of the metal shelf of the seal.

2 cl, 1 dwg

Description

Technology area

The invention relates to the metallurgical industry, namely, to the production of metals and alloys in ore-reduction electric furnaces with a rotating bath.

State of the art

During the production of metals and alloys in ore reduction furnaces, when the melt is discharged from the furnace, gases emitted from the furnace together with the melt rise upward under the working mark and through the gap between the working platform in the rotating bath furnace they penetrate the working platform, which worsens the sanitary condition of the air in the working area at the working site of the furnace (Ryss MA "Ferroalloy production", M., Metallurgy, 1985, pp. 62-64).

Known methods for sealing the bath casing:

- firms "Elkem", Norway, when the furnace bath is mounted close to the working site ("Ferrosilicon production", Directory, Novokuznetsk, 2000, p. 142). This technical solution prevents the penetration of gases into the working platform of the furnace;

- the firm "Mannesmann Demag", when gases from under the working mark are evacuated under the umbrella of the furnace ("Ferrosilicon Production", Directory, Novokuznetsk, 2000, p. 146). The disadvantages of these methods of sealing the bath is their use only for furnaces with a stationary bath;

For rotary bath ovens, clearance is required between the platform and the bath casing.

There is a known method of sealing the bathtub of the company "Tagliaferri", Italy for furnaces with a rotating bathtub, when the gases formed during the reduction processes are removed from under the roof into the gas purification system, and the roof is sealed using a sand shutter (Shevchenko V.F. "Device and operation of equipment ferroalloy plants ", M., metallurgy, 1982, p. 122). This technical solution is taken as the closest analogue.

The disadvantage of this technical solution is that the space between the bathtub and the floor of the working platform has a gap and gases from under the working platform enter the working platform of the furnace and worsen the sanitary state of the air in the working area.

There is a known device for sealing the casing of the bath of an ore-reduction furnace with a rotating bath (RF patent for utility model No. 196519, F27D 1/00, publ. 03.03.2020), including the casing of the bath installed in the opening of the working platform, and the gap between the rotating bath has a seal in in the form of a hinged metal shelf, fixed on the casing of the furnace bath and protected from refractory concrete from the side of the working area of the furnace. The disadvantages of this technical solution are:

- insufficient service life of the metal structure of the shelf due to its abrasive wear on the concrete floor of the working platform of the production room during the rotation of the furnace bath;

- the ingress of gases into the atmosphere of the working platform through the gap between the bath seal and the floor of the working platform.

The objective of the present invention is to improve the reliability of the furnace equipment.

The technical result is: a decrease in the amount of gases released into the atmosphere of industrial buildings during the discharge of the melt from the furnace and an increase in the service life of the metal structures of the seal.

Disclosure of technical solution The technical result is achieved by the fact that the gap between the furnace bath and the floor of the working platform, closed by a hinged metal shelf that prevents the penetration of gases into the working platform between the bath and the floor of the working platform, has an additional seal on the side of the working platform is made in the form of a circular metal beam, built into the floor of the work platform, on which the metal shelf rests tightly. The additional seal prevents the gases released from the furnace during melt tapping from entering the atmosphere of industrial buildings and at the same time increases the service life of the metal seal shelf by reducing abrasive wear of the seal metal structure.

Brief description of the drawings The seal of the ore-reduction furnace bath is a hinged metal shelf (5) fixed on the shell of the furnace bath (1) with a refractory concrete protection (4) to prevent wear and damage to the metal shelf from the temperature effects of the furnace working area. The hinged shelf (5) rests without clearance on a metal beam (2) mounted in the floor of the platform (3). The tight support of the hinged seal shelf (5) on the circular beam (2) prevents gases from entering the atmosphere of the working area of the production building. In addition, the support of the metal shelf (5) on the metal beam (2) reduces abrasion and increases the life of the seal.

Implementation of the technical solution The seal installed on the bath of the ore-reduction furnace does not impede the rotation of the bath, prevents the release of gases emitted from the furnace into the atmosphere of industrial buildings during the melt discharge from the furnace. Additional sealing of the gap between the metal shelf of the bath and the floor of the working mark by supporting the shelf on the beam further reduces the dustiness of the air on the working platform.

During the operation of the furnace, measurements were taken of the content of dusty substances in the air of the working area. Dust content was determined in the amount of 0.84 mg / m ³ , which is significantly lower than previous measurements before the installation of a circular beam (0.98 mg / m3) and before the installation of the seal (1.26 mg / m ³ ) and sanitary standards (1 mg / m ³ ).

A device for additional sealing of the bath casing in the form of a circular metal beam mounted in the floor of the working platform to support the metal seal shelf, reduces abrasive wear of the metal shelf of the bath seal, previously resting on the concrete floor of the working platform, and increases the shelf life.

When resting the metal seal flange on a concrete pad, the flange had to be repaired every 6-8 months. After the installation of the circular metal beam into the floor of the working platform, the service life of the beam increased: within 12 months of operation, the beam did not need to be repaired.

Supporting the metal shelf to seal the gap between the rotating bath of the ore-reduction furnace and the floor of the working mark of the production building on a circular metal beam mounted in the floor of the working platform is a difference from the analogue, determines the "novelty of the technical solution", meets the criterion "significant difference".

Claims (2)

1. Sealing the casing of the bath of the ore-reduction furnace with a rotating bath installed in the opening of the working platform of the furnace, containing a hinged metal shelf installed in the gap between the bath of the furnace and the floor of the working platform of the furnace and fixed on the casing of the bath, characterized in that it is provided with a circular metal beam, built into the floor of the working platform with the provision of tight support on a circular metal beam. 2. A method of sealing the casing of a bath of an ore-reduction furnace with a rotating bath installed in the opening of the working platform of the furnace, characterized in that a seal according to claim 1 is used, while a circular metal beam is installed between the hinged metal shelf and the floor of the working platform and mounted on the floor, ensuring the possibility of tightly supporting a hinged metal shelf on it.

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