SU708130A1 - Electric-arc melting furnace - Google Patents

Description

(54) D FAMILY PLAIL OVEN

I

The invention relates to the production of metals n alloys and can be operated in steel-making metallurgical furnaces and machine-building factories.

A known steel electrode is a steel-smelting furnace consisting of noflvsubj, walls and a roof, and the roof has a outer diameter smaller than the internal diameter of the walls of the furnace. Due to this, the arch can be moved relative to the furnace walls vertically.

The disadvantage of this design is to seal the gap between the roof and the walls of the furnace.

A known arc melting furnace, with a variable geometry of the working space, containing a bottom lining, moans and a water-cooled movable roof 2.

However, the known furnace is complex in design, the seal of the annular gap between the roof and the walls is unreliable, the lip seal is short-lived.

In order to ensure the operability of this 15echn, it is necessary to accurately manufacture the o.cooled vault and furnace walls with diameter deviations of + 5 mm. For large capacity furnaces, this is a serious obstacle, since the diameter of the working space is 6-7 m. In addition, an analysis of the thermal performance of an electric arc furnace shows that it is not necessary to mix the arch as it melts. After the charge is charged into the furnace, the wells are melted down, a bath of molten metal is formed at the furnace bottom. In the future, the arc burns at the bottom, and the top is the charge screening arc. Thus, the radiation from the arc and the bath to the roof and the upper part of the walls is practically excluded. This position is maintained until most foreigners melt.

Claims (2)

The purpose of the invention is to reduce the amount of electricity and electrodes. 37 The goal is achieved due to the fact that on the walls there is a freely mounted hollow ring having the same internal diameter with the walls, equipped with an L-shaped ring bracket, with a shelf facing the vertical axis of the furnace, for adhering the ring to the arch, and the side walls the roof and the masonry of the furnace in contact with them at the extreme lower position of the siod have a conical shape, and the angle at the top of the tire is 80-90 °. The drawing shows the proposed oven. The arc melting furnace consists of a bottom 1, a laying of 2 walls, a hollow cool free ring 3 and a water cooled arch 4. From the side of the working space 5 of the furnace, the arch 4 is equipped with a heat-insulating gasket 6. On the outer sheet .7 of the arch 4 along its perimeter gasket 8 (asbestos, paronite, etc.). The arch ring 3 is equipped with an L-shaped ring ring bracket 9. The side walls of the cooled core 4 are a conical surface with an apex angle of 8 ° –9 °. The same configuration has the laying of -2 furnace walls at the level of the top point of the working window 11. After charging the charge to the working space 5 of the furnace, its level reaches, the packings of the water-cooled roof 4. The arch is in the uppermost position and the arch lifting mechanism is pressed to the bracket 9 The furnace is sealed by a gasket 8 located around the perimeter of the top sheet 7 of the roof 4. After the wells are melted, the charge melts from below and the level of the shaft goes down. As soon as the level of the shih.hty reaches the working window 11 (it is observed visually through the window), the arch of shuffles is: to the lowest position (shown by dotted lines). The furnace is sealed at a lower arch position along a conical surface. An angle at the apex of this conical surface of 8090 ° ensures that there is no charge on the masonry of 2 walls when lowering the level of the charge below the upper edge of the working window 11. The purity of the conical surface of the brick ensures a good sealing of the furnace. 4 The end) / 1c; 11la, the oxidation and reduction of the oxidation phase of the photoscale is carried out at the extreme position of the arch. At the same time, the gyurna part a of the walls turns out to be recovered from the working space 5 pscn. Therefore, the heat loss is reduced. In addition, the length of the electrodes in the hot zone is reduced by an amount (S i which leads to a reduction in their specific consumption. The heat transfer conditions to the bath at the lower arch are improved by increasing the strength of the furnace's working volume. (The same input power at a lower volume working space). After the metal is discharged and the furnace is refilled, the arch 4 is moved using the mechanism of raising the arch upwards, the arch is attached to the arch ring 3 by means of the L-shaped bracket 9 and further movement takes place in The top of arch 4 and arch ring 3. Then arch 4 with arch ring 3 is turned to the side (or Bbt furnace) and filling is made of WI.TA. The arch 4 with arch ring 3 is again placed on the wall 2 of the furnace, and the furnace is turned on to melt. The formula of the image of the arc The arc melting furnace with a variable geometry of the working space, contains; zhdaemoe hollow ring having the same inside diameter with walls provided with L-shaped bracket koltsev1M facing flange to the vertical furnace axis, for engaging with a set of rings, and the side walls. the vault and the furnace in contact with them at the lowest lower position of the vault are conical, with an apex angle of 80-90. Sources of information taken into account during the examination 1. USSR author's certificate No. 287238, cl. 27 to 3 / O8. 197O. 2. USSR Author's Certificate No. 41О104, cl. C 21 C 5/52, 1974 (prototype). U i; i 5J | I H /