SU991117A1 - Device for blowing metal by gas in electric arc furnace - Google Patents

Description

(54) DEVICE FOR GAS BLOWING OF METAL IN ELECTRIC ARC FURNACE

1 The invention relates to the black metal industry, namely to the equipment of electric arc furnaces.

A device for blowing metal through a lined or metalless metal-fed metal tube introduced through a working window is known fl J

However, through such devices it is impossible to purge large masses of metal in shchunotonnazhns furnaces, when the flow of acid is maintained up to 25OO-4OOO, the main limitation imposes a mechanical reaction of the gas jet, not allowed. to control the course and quality of the purge. In connection with this, manual blow-down on large-scale pipes is not used as it reduces the manufacturer of the furnace and other economic and economic indicators.

Closest to the invention to the technical essence and the achieved result is a device for blowing metal purge, including a tube, bend.

her back torso suspension, 1; with the shaft for its axial movement and change of the angle of inclination to the surface of the bath 2.

The drawbacks of the device are a cumbersome design, limiting the degrees of freedom of an electric arc furnace (inclinations, HOBopoTbi) t, and the insufficient speed of removing the tuyere from the furnace in the event of an emergency due to the presence of the joint. Ea: deficiencies in the coBoiEcynHocTH with a low-ayihod of the hs | dny due to intensive disruption of metal Neither make it difficult to cracking the application of this device on an electric arc furnace.

The purpose of the invention is to reduce the overall dimensions of the device and increase the yield of suitable metal.

Claims (2)

This goal is achieved; the device for blowing metal with gas into electric arc nets, including a tube, a flexible suspension for its rear end, a drive with a shaft for its axial offset and a change in the angle of inclination to the surface of the bath, is provided with a fixing and guide rollers in contact with the tube and interconnected holder, which is pivotally attached to the furnace body, while the holder is freely mounted on a common shaft for driving the axial movement of the tube and the guide roller and is rigidly connected with a lever changing the angle of inclination of the tube through the shaft of the latching rail) FIG. 1 shows the general scheme of the device for blowing metal with gas in an electric furnace} in FIG. 2 - device for moving the tube; in fig. 3 is the same side view in FIG. 4 - the position of the device when the tube is disconnected; in fig. 5 - device with a clamped lower end of the tube in the rollers; in fig. 6 - the device when entering the tube into the furnace; in fig. 7 - the position of the device with a fully inserted tube into the furnace. The device diagram (Fig. 1) shows an electric arc furnace 1 in the wall of which (in the upper zone) there is a squaw; inclined channel. The geometrical dimensions of this channel and the angle of inclination of its axis to the horizontal surface are chosen based on the actual dimensions of the furnace and the required range of adjusting the angle of introduction of the gas jet into the metal being processed. Near the external opening of the channel, the support ponKJ — a guide roller (driving) 2 and a supporting roller 3, as well as a drive unit 4 for axial displacement and change of the angle of the tube 5 are mounted on the furnace body. The rear end of the tube 5 is connected to a flexible inlet through clamp 6 pipe 7, the connector is attached to the cable 8 of the winch 9 with a push-button console 10, on the same console 10 there are buttons for controlling the drives 4, which include (Fig. 2) an electro-mechanical drive 11 of rotation on the guide 2, providing reversible odeBoe movement of pipes ki 5, and the hydraulic actuator 12 connected through the lever 13 to the yoke 14. The yoke 14 is hinged to the kiln housing 1 and connects the support rods, and it is loosely mounted on the drive shaft 15 of the guide roller 2 and the lining 16 is fixedly attached va. fixing roller | 3. In this way, the holder can be rotated around the hinge, you have fastening to the furnace body with both rollers. The device works as follows, (Fig. 3). Before the start of the purge, the clamp 6 is in its extreme upper position (Fig. 3). To fasten a tube of measured length, clamp 6 is lowered with cable 8 onto the furnace working platform to a point remote from the juicy rollers 2 and 3 for a distance equal to the length of tube 5. The front end of tube 5 is inserted between rollers 2 and 3, and the rear end is reinforced in the clamp 6. Then the rear end of the tube 5 is lifted with a winch using the cable 8 and the actuator 11 of the axial movement of the tube is switched on, whereby its front end passes into the working space of the furnace. Until tube 5 reaches the bath mirror, a minimum amount of gas is passed through it to cool the tube walls, and after deepening a predetermined flow rate. As the front part of the tube 5 burns, it is pushed into the bath, weakening the tension of the cable 8, respectively. At the end of the purge or the maximum exhaustion of the tubes, the latter is pushed out of the working space, thus reducing the gas flow rate. In the case of rollers slipping, which is possible at some positions of the tube due to a decrease in the clamping force of the tube against the rollers, the corresponding clamping force is achieved by pulling the cable. If it is necessary to change the angle of inclination of the tube, the regulation is carried out by means of a hydraulic actuator 12, which ensures the deviation of the fixing roller 2 from the initial position through the lever 13 and the yoke 14. Purging can be carried out both with oxidative (oxygen) and inert (argon, etc.) gases. During oxygen purging, due to the deepening of the inclined jet, there is a significant decrease in fly away and carbon loss of the metal part. Selection and regulation of the angle of introduction of the jet into the metal ensures the optimization of the technological process. The use of such a device for metal blowdown in electric arc furnaces will increase the yield of good meta; shorten the melting time, which together can provide a significant economic effect. Apparatus of the Invention A device for purging a metal with a gas in a section-circular furnace, including a tube, Rtlba, a suspension of its rear torp, fi in order to reduce the overall dimensions of the device and increase. If the output of a suitable metal, it is equipped with a pulley and guide rollers, contacting with the tube and sohveshvesBD iSh a clip. The hinge is bolted to the furnace body, while the holder is freely seated on a common shaft for driving the axial movement of the tube and roller and is rigidly connected with a lever to the drives for changing the angle of the tube through the shaft of the fixing roller. Sources of information taken into account in the examination 1. Mikhailov O, A. Production of steel using oxygen. M., Metallurgists, 1964, p. 79. 2. Patent of England No. 1267640, cl. E 2 B, otpublik. 1972.