SU1654345A1 - Lance for blowing molten metal in converters - Google Patents

Description

This is related to the organizing; i; i "of blowing oxygen into the metallurgical furnaces, in particular, with the converter with oxygen-top blast.

The purpose of the invention is to reduce the consumption of t / guna for smelting due to the effectiveness of after-burning of oxide of 5 g.

Figure 1 shows a lance at the periphery (cooling water supply to the head, vertical section; fig 2, the same with the central connection of water to the head; figure 3 - central nozzle with a throttle device, vertical section in Fig. 4 - 6 - sections along the Rus nozzles.

The lance for purging the melt in the converter consists of four centrally arranged one-piece pipes and a head. When performing a tuyere with a peripheral supply of cooling water to the head (Fig. 1), an individual oxygen flow is supplied through the central tube 1 for the afterburning of CO to C0Ј to the central nozzle 2 with a throttle device in the form of a glass 3. The main second oxygen flow is passed through the tube 4

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for purging the bath to the peripheral nozzle group 5 Laval. Cooling water is supplied through pipe 6 and discharged through the outer pipe 7. When the lance with a central cooling water supply is carried out, the individual oxygen flow is also supplied through the central pipe 1 to after the combustion of CO to C02 to the center. a nozzle 2 with a throttle device in the form of a beaker 3. A second, main stream of oxygen is supplied through pipe 4 to purge the bath to the peripheral group of Laval nozzles 5 (5

The central supply of cooling water is carried out through pipe 6, and water is discharged through the outer pipe 7. Regardless of the selected cooling system for the tuyere head, the central 20 nozzle 2 with the throttle device in the form of a glass 3 and the individual oxygen supply path through the pipe 1 have the same design (Fig. H).

Holes are cut in the wall of glass 3 on three floors 8–10 in height from the bottom. On the first tier 8, the holes 11 are diametrically opposite each other, on the second tier 9, the holes 12 are directed tangentially inside the glass clockwise, and on the third tier 10, the holes 13 are oriented tangentially to the inside of the glass in the opposite direction counterclockwise. 35

The glass 3 is fastened to the thread 14 inside the central nozzle 2. In the event of damage to the tuyere head, the glass 3 is ejected from the central nozzle 2 and installed in new heads of tuyeres. The area of the annular gap 15 for supplying oxygen to the holes of the glass 3, the total area of the cross sections of the holes 11-13 and the area of the internal section of the 16 glass are equal to D5 between them.

The lance works as follows. .

The main stream of oxygen for purging the bath is fed through pipe 4 to the ne CQ riflear group of 5 Laval nozzles, which are used to form supersonic oxygen jets that penetrate deeply into the bath at a working arrangement of the tuyere height. This creates a powerful counter-current of carbon monoxide, which is released mainly from the limits of the reaction zone of the interaction of oxygen jets with

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melt. An additional stream of oxygen for the post-combustion of carbon monoxide is supplied through the central pipe 1 to the central nozzle 2 with a throttle device in the form of a glass 3 and through the annular gap 15 and the apertures 11-13 of the pipes 8-10, respectively, flows into the interior of the glass 3. At the same time, opposite to each other openings 11 on the first russa 8 of the glass, reciprocal braking occurs with loss of velocity of the oxygen jets with the formation of a flow, which is twisted due to the tangential supply of oxygen jets through the holes 12 on Russe 9 clockwise, and then additionally slowed down as a result of tangential supply of oxygen jets through openings 13 on Ruce 10. As a result, a rapid drop in the rate of oxygen flow occurs within the height of the cup 3 of the throttle device. At the same time, the stream of oxygen emanating from subsonic speed from glass 3 expands rapidly and loses its speed as it spreads to the bath, involves counter-evolving carbon monoxide and burns the latter to CO to form a high-temperature flare. The heat released during this process is transferred to the bath, which improves the heat balance of the smelting and helps to reduce the consumption of pig iron. Since the throttle device 3 in the proposed lance design is provided with an individual oxygen supply path 1, it provides more efficient addition of CO to CO by adjusting the oxygen consumption during periods of melting, namely increasing the oxygen supply through the throttle device during intensive decarburization of the bath and reducing the initial and final stages of operation when the carbon oxidation rate is low.

The design of the tuyeres allows for more efficient post-combustion of carbon monoxide released from the reaction zone due to the rapid damping of the velocity and an increase in the ejecting ability of the central oxygen stream formed by the throttle device. In addition, the lance allows for more flexible management of the afterburning of carbon monoxide in the converter’s cavity

Claims (1)

independently adjustable oxygen through the throttle device, and also reduce the consumption of 4yiyna by 10-14.6 kg / ton of usable steel. Only by reducing the consumption of domestic iron in the metal charge by 10 k / t of steel, and a corresponding increase in the consumption of scrap, the savings on IPH costs under the conditions of the converter shop. Invention Formula The tuyere for melt purging in the chopper, containing a head / with front nozzles and a central nozzle, is j chokes / pot. m, m, otpichayus1 1 i the fact that, ssh-schchen mon the iron and gas supply by increasing the efficiency of afterburning of carbon monoxide, the throttle device is made in the form of a glass, in the wall of which three tresses in height from the bottom of the hole are cut through, which are diametrically opposite each other, on the moat trestle directed tangentially into one, and on the third floor tangentially into the prot1 opposite side, the cup is placed with an annular gap inside the central nozzle, which is provided with - an individual gas supply path, while the area of the annular gap, 1 mmar of the cross sections of the openings 1аа and the tip of the internal section of the glass, are equal to each other; U 16 FIG. 2 FIG. five eleven P FIG 4 L FIG. five / J / J FIG. 6