SU836486A1 - Melting furnace roof ring - Google Patents

Description

(54) ARRAY RING MOLDING OVEN

I

The invention relates to nacTVi ectrometappurgy and can be used in equipment for the production of steppes, mainly in arc steelmaking furnaces.

Arches of the arc arc spectrophe are designed to hold arched brick vaults and are made, as a rule, water-cooled. On high-capacity electric furnaces, the length of the perimeter of the arched ring is more than 2 m and, due to low speeds of water, the flow is laminar, which leads to the formation of a vapor film along the lower part of the inner wall of the arched collar, cracks appear and the arched ring emerges from build.

Known arched ring box-shaped, water-cavity which is divided into two parts. The water first enters the innermost (smaller) area to cool the hottest parts of the ring, then it overflows into the outer cavity and is drained from FieeCll. The presence of a welded seam connecting the lower horizontal sheet of the box and an inclined sheet to support its own dome facing the furnace space worsens the stability of the roof, and the implementation of water cooling of the box section cavity increases the hydraulic losses and prevents high flow rates in the cavity.

The arch ring of the EAF-8OA, fMZ furnace is known, where water is initially supplied to the collector installed

inside the water cooled cavity. The collector is mounted with nozzles that are directed at an acute angle to the direction of water flow into the lower inner corner of the G2 ring. The disadvantages of this design

its complexity (presence of a collector), low velocity of water in the cavity, and because of its large cross section.

The known support of the roof of industrial furnaces is made in the form of a wall, which is made up of quadrangular tubes through which coolant 3j is passed. The disadvantages of this design are its complexity, the presence of fifth brick, tubes of special (quadrilateral) cross section.

A prototype was taken of a known construction consisting of two annular tubes connected by a conical shell and a horizontal support ring with

sand shutter knife. Water is first supplied to the lower pipe and cools the hottest parts of the ring, and then it is poured into the upper pipe and 4% is left out of it.

In this construction, the gap between the pipes is not cooled, which leads to different temperatures on the roof ring and tecture stress. When making the roof ring from

pipes laid one on the other require pipes of larger diameter, which leads to low water velocities and low ring resistance.

The chain of the invention is to increase the durability of the cove.

The goal is achieved by the fact that in the arch ring containing the support, the cone of the lining, the horizontal support ring with the sand-gate knife, the bottom

the part of the arch ring facing the furnace space is made with an annular tube, and the supporting surface of the arch connected to it is composed of two conical shells forming a cooling cavity interconnected at the top through an intermediate ring, with the cavities of the pipe and the supporting surface of the arch communicating in series.

For the purpose of better cooling by

increasing the speed of water, the cavity of the supporting surface of the arch is divided by intermediate rings into successive channels.

FIG. 1 shows the arch ring, a side view with a partial tear-out; in FIG. 2 - it is in the plan; in fig. 3, section A-A in FIG. one.

 The arch ring has a horizontal support ring 1 with a knife 2 sand gate. The part of the ring facing the furnace space and lying on the lining of the bath 3 is made with an annular tube4. The cavity of the pipe is in series with the cavity formed

two conical shells 5 gi. 6. Shell 5 is designed to support the arch of the furnace 7 itself without a special fifth brick. (The Hooks are connected at the top through an intermediate lance 8. Water is supplied by nozzles 9, and drainage is done by a nozzle 10.

The cavity of the abutment surface can be separated by intermediate rings 11. The ring has gussets 12 to ensure rigidity.

Performing the lower part of the roof ring, which is turned into the furnace space, with a pipe, allows to reach high speeds of cooling water in the most heat-loaded part of the ring, which improves the cooling of the ring. This is also facilitated by the design of the supporting surface of the vault, namely the presence of channels communicating sequentially. All this, as well as the fact that it is possible to remove the weld from the zone of direct irradiation, hiding it under the lining, increases the resistance of the arch ring. Increasing the durability of the ring ring leads to a reduction in labor costs and materials for the manufacture of a new vault, increases the effective timeframe of the furnace, and consequently, its performance by reducing the number of replacements of the vaulted ring. The removal of the weld from the zone of direct irradiation improves the safety of operation of the roof ring, since the probable place of breakthrough of the weld is taken out of the furnace space.

Claims (4)

Invention Formula The arch ring of the melting furnace containing the lining support cone, the horizontal support ring with the sand-gate knife, is different in that, in order to increase durability, its lower part, facing the furnace space, is formed as a ring tube, and the supporting surface of the roof is connected to it. from two conical shells, forming a cooling cavity, interconnected at the top through an intermediate ring, with the cavity of the pipe and the bearing surface of the roof are connected in series, 2. The ring according to Claim 1, of which is 8 so that, for the purpose of better cooling, the cavity of the bearing surface of the vault is divided by intermediate rings into successive channels. Information sources, taken into account in expert examinations 583 1. Zinurov I. Yu., Stroganov A. I., Kuznetsov LK and others. Arc steel-smelting furnaces. Atpas, M., Metallurgists, 1978, fig. IV 1 to. 2. Copyright certificate CCCf No 37Й418, кп. F 271) 1/02, 1973. 4866 3. Patent of Great Britain N. 938274, cl. 51 (213), 1963. 4. Zinurov I. Yu., Stroganov A. I., Kuznetsov LK, et al. Arc-type steel furnaces. Atlas, M ,. Metallurgists, 1978, fig. 1Y I p.