SU1502942A1 - Arrangement for heating scrap with furnace flue gas - Google Patents

Abstract

The invention relates to metallurgy and can be used to pre-heat scrap with flue gas from an electric furnace. The purpose of the invention is to increase the reliability of the tub. The inner wall 7 of the bucket 4 at the upper end is connected to the outer wall 6 by means of a flange 8, the openings 12 of which communicate a cavity between the walls 6 and 7 with a cavity between the bucket and the chamber 1. 2 Il.

Description

one

(21) 4185025 / 23-02

(22) 01.20.87

(46) 08.23.89. Bnsh. No. 31

(71) All-Union Scientific Research and Design Institute for the purification of process gases, waste water and the use of secondary energy resources of ferrous metallurgy enterprises

(72) A.G. Notych and A.Z. Ryzhavsky (53) 669.187 (088.8)

(56) US Patent No. 3385582, kp. 263-47, 1968.

Ferrous metals, 1970, № 10, p. 23.

() DEVICE FOR HEATING SKRAPA WITH ELECTROPREAM SMOKE GASES (57) The invention relates to metallurgy and can be used to preheat the scrap by the flue gases of an electric furnace. The purpose of the invention is to increase the reliability of the tub. The inner wall 7 of the tub on the upper end is connected to the outer wall 6 by means of a flange 8, the openings 12 of which communicate a cavity between the walls 6 and 7 with a cavity between the tub and the chamber 1. 1 Cp. F., 2 ill.

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Isolation refers to the field of ferrous metallurgy, in particular to auxiliary technological equipment for preheating scrap.

The purpose of the invention is to increase the reliability of the tub.

Figure 1 shows the print-spy diagram of the device, a general view; figure 2 - node I in figure 1.

The device for heating the scrap by flue gases of an electric furnace consists of a stationary heating chamber 1 with a gas outlet pipe 2 in the bottom and a hydraulic lock 3 on the outer side of the wall chamber. In the chamber, a badge 4 with a screen is installed, having apron 5, a cylindrical body with a double wall (outer 6 and inner 7). The chamber with the tub is covered during heating of the scrap with a cover 9 with a gas inlet 10 and a seal 11. In the flange 8, channels 12 are made that connect the cavity between the walls of the tub and the cavity between the chamber and the tub.

The device works as follows.

After the installation of the bucket 4 with skrapt into the chamber 1, the latter is closed by the lid 9 with simultaneous sealing of the joints with the seal 11. Combustible flue gases with a temperature of up to 800 come into the device under the influence of the fan’s traction. C. Gases pass through the layer of scrap to the lower edge of the cylindrical body of the tub, heat the scrap and cool to t 250 - 350 C. Next, the gas tank is divided: the main part of the ghats;) goes through the bottom c.-un i of the scrap and leaves

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bucket A through the opening in the aprons 5 and the gap between them and the outer wall 6 of the housing, the other part enters the cavity between the walls 6 and 7 of the housing of the tub A, then through the gas channels 12 in the end flange 8 and the cavity between the outer wall 6 of the tub 4 and the chamber 1 on the offset with the main part of the gas.

When part of the cooled flue gases is discharged through the cavity between the walls 6 and 7 of the hull of the tub, the outer and supporting wall 6 is washed from both sides by a gas stream whose temperature does not exceed 350 ° C, which is completely safe for the strength properties of the material and design, i.e. reliability of work of a tub increases.

Claims (2)

1. A device for heating the scrap by flue gases of an electric furnace, including a double-walled bucket, connected by a flange on the upper end, and 1) a bottom plate, while the tank is installed in a stationary heating chamber with a gas inlet pipe in the lid for connection to the gas duct electric furnaces and a gas outlet in the bottom, characterized in that, in order to increase the reliability of the tub, the cavity between the walls of the tub and the cavity between the tub and the chamber are communicated, 2. A device according to claim 1, characterized in that channels are made in the flange, communicating the cavity between the tub walls and the post, between the tub and the chamber.