RU2066032C1 - Central part of electrical furnace water cooling arch - Google Patents

Abstract

FIELD: ferrous metallurgy, electrical furnaces water cooled arches in particular. SUBSTANCE: central part of electrical furnace water cooling arch has sections 2 combined to each other and made of metal pipes with lined holes for electrodes, water cooling housing 1 made of outer row of pipes embracing sections by single contour and of inner row of pipes bending around lined holes for electrodes and presenting incomplete circumferences converging to center of arch, in pairs connected to each other and forming converging space in center of arch by straight areas 5, that are linked to each other by caps 6. Inner row of pipes is made detachable and free space inside arch is lined with refractory bricks. EFFECT: increased productivity of furnace and service life of electrodes holders. 2 dwg

Description

 The invention relates to ferrous metallurgy, in particular to devices for water-cooled arches of melting electric furnaces.

 The central part of the water-cooled arch of the electric furnace is known (O. M. Sosonkin, V. A. Kudrin, “Water-cooled arch of an electric arc furnace. M. Metallurgy, 1985, p. 19), containing three water-cooled sections separated by a refractory brick, which is installed through electrical insulating gaskets on the peripheral part of the vault. The design drawback is that at high temperatures during the smelting process the refractory masonry is saturated with metal particles, as a result of which microarcs arise between the sections, which leads to a quick burnout of the section metal structures and failure of the arch.

 Also known is the central section of the water-cooled arch of the electric furnace (A. C. N 1317259, class F 27 D 1/02, 1987), containing a frame made in the form of a frame on which tubular water-cooled cells are fixed with tubular water-cooled sections lined in them inside with refractory bricks, the gaps between the sections are covered by water-cooled panels.

 The disadvantage of the design is the presence of brickwork, which reduces the durability of the vault and entails frequent downtime of the furnace during repairs when replacing the lining. The closest in technical essence to the claimed invention is a water-cooled lid for metallurgical vessels (A.S. N 1093261, F 27 D 1/02), containing an external moratorium ring made in the form of incomplete circles around the electrodes connected by convex elbows towards the center of the lid .

 However, the lack of overlapping of the center of the arch reduces the performance of the electric holders due to the exit of exhaust gases, and the fixed design of the internal moratorium ring does not allow for a quick replacement of the central part.

 The invention is aimed at improving the reliability of the arch of the furnace due to the removable central part.

 The goal is achieved in that in the central part of the water-cooled arch of the electric furnace, containing sections interconnected and made of metal pipes, with lined holes for the electrodes, a water-cooled frame, consisting of an external row of pipes covering the sections in a single circuit, and an inner row of pipes enveloping lined holes for electrodes and representing incomplete circles converging to the center of the arch, pairwise interconnected and forming a free space in the center of the arch, incomplete According to the invention, the legs converge to the center of the arch in straight sections that are interconnected by caps, and the inner row of pipes of the water-cooled frame is made removable, while the free space in the center of the arch is lined with refractory bricks. The above differences of the proposed technical solution provide an increase in furnace productivity by reducing the time to change the arch, and also avoid the emission of gases through the center of the arch, which will increase the performance of the electric holders.

 In FIG. 1 shows the arch of an electric furnace, a top view; in FIG. 2, section AA in FIG. 1.

 The central part of the water-cooled arch consists of an external water-cooled frame 1, water-cooled sections 2 and an internal removable water-cooled frame 3, envelope holes for electrodes with a refractory lining 4, the removable frame 3 consists of pipes representing incomplete circles around the electrodes, ending in straight sections 5 connected by straight sections 5 connected between each other in caps 6.

 The central part is mounted on the vault ring 7 of the peripheral part of the vault and is shunted with copper plates. During operation of the electric furnace, electromagnetic currents occur in the central sections of the roof, which go to the ground through the peripheral part of the roof.

Claims (1)

 The central part of the water-cooled arch of the electric furnace, containing sections interconnected and made of metal pipes with lined holes for the electrodes, a water-cooled frame, consisting of an outer row of pipes covering the sections in a single circuit, and an inner row of pipes, enveloping the lined holes for the electrodes and representing incomplete circles converging to the center of the arch, pairwise interconnected and forming a free space in the center of the arch, characterized in that the incomplete circumference and converge toward the center straight arch portions, which are interconnected caps, and the inner water-cooled pipe frame number is removable, the free space in the center of the arch is lined with refractory brick.

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