SU350365A1 - Method of melting steel in two-bath furnace - Google Patents

Description

(54) METHOD FOR MELTING STEEL IN A DOUBLE-STEEL FURNACE

The invention relates to the field of ferrous metallurgy, in particular to steelmaking.

There is a known method of steelmaking in a two-bath furnace, including the heating of air for the technological process in the nozzles of the regenerator, the heated products of combustion, alternately coming from the working space of one of the baths. However, due to the large interstitial time between changing the direction of the combustion products, the temperature of the air entering the furnace gradually decreases to low values, while the temperature of the nozzle of the regenerator, in which smoke is removed during this period, constantly increases. The waste heat is not fully utilized.

In order to improve heat utilization, it is proposed that the product 1 burns, from the same bath, be sent alternately to the regenerators of both baths.

FIG. 1 shows a diagram of the movement of gases in a steel-smelting, two-bath furnace during its operation with the right bath loaded with the charge and the left (according to the drawing) bath loaded with the bath; in fig. Figure 2 shows the movement of gases when the nozzle of the left (according to the drawing) regenerator reaches its maximum permissible temperature.

The two-bath furnace has baths 1 and 2, slag stones 3 and 4, regenerators 5 and 6, and boar 7 and 8. connected to a throw-over device. The regenerators 5 and b are connected to the H1 workers 3 and 4 by means of hogs 9. 10. 11 and 12. having shut-off valves 13. 14. 15 and 16. The smoke path has a flap valve 17, a branch pipe 18 of an injection fan and a chimney flue 19. Bath 2 has a head 20. And bath 1-head 21.

When the torch moves in the working space from right to left (see Fig. 1), the flue gases pass through the picavic 3. valve 13. burs 9. regenerator 5, burs 7. reversing device, valve 17 of which occupies position I. and go to the hog 19. At this time, the fan air from the pipe 18 through the reversing device, the hog 8. the regenerator 6. the valve 14 and the burs 10 enters the slag-stone 4 and then into the head 20 of the bath 2. where it participates in combustion.

When heated to a predetermined temperature, the nozzle of the regenerator 5 (see Fig. 2) and the cooling of the nozzle of the regenerator b automatically close the valves 13 and 14. the valves 15 and 16 open. The valve 17 of the throw-over device from position I does not take place in the position of P. and the flue gases enter from slag 3 to