SU1401054A1 - Melt-blowing lance - Google Patents

Abstract

This invention relates to lance designs. The purpose of the invention is to reduce the time of melt purging and increase the durability of the tuyere. The lance includes concentric tubes that form an oxidizer supply path (TPO), coolant supply and removal, a face head having an oxidant tube bottom (DTO) and a shell connected by a purge nozzle, and a cavity cavity (RP). The RP is made of a part of the nozzle protruding beyond the AHT, and bounded by the dog and the surface adjacent to the surface of the pore chamber located in the TPO above the nozzle. When gas is supplied through the TPO, it is turbulent in the prechamber and its eddies enter the RP. At the nozzle exit section, periodic perturbations appear, which are converted into pulsations of the gas stream flowing out of the nozzle. 3 hp f-ly, 3 ill. with (L

Description

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The invention relates to metallurgy, in particular to tuyeres for gas supply, and can be used in the oxygen converter conversion of cast iron.

The purpose of the invention is to reduce the purge time and increase the durability of the tuyere.

FIG. 1 shows a lance, sheath, view; in fig. 2 shows section A-A in FIG. one; in fig. 3 - a variant of a tuyere.

The melt purge tuyere includes concentric tubes 1-3 forming the oxidizer supply path 4, supply path 5 and coolant outlet path b, face head 7 having the bottom 8 of oxidizer tube 1 and shell 9 connected by purge nozzles 10. The tuyere is equipped with chambers 11 Sonel 10, placed in the path 4 of the oxidizer feed above the nozzles 10, i.e. above the sections are 12 input sections of the sonel 10, and resonator cavities 13. In this case, the resonator cavity 13 is made covering the part 14 of the nozzle 10, protruding beyond the bottom 8, the oxidizer tube 1 into the path 4, i.e. The height of the resonator cavity 13 is determined by the height h of the protrusion part 14 of the nozzle 10 behind the bottom 8 of the oxidant pipe 1. The amount of rubber is; The lateral cavity 13 is also limited by the bottom: lump 8 of the oxidizer pipe 1 and by the surface 15 adjacent to the surface 16 of the extrusion chamber 11, i.e. volume of the cavity, covering the outer surface of the nozzle 10 and lying below the cut-off plane 12 of the inlet section of the nozzle 10. The prechamber 11 and the cavity cavities 13 are formed with figure-like partitions 17 interposed by nozzles 10.

The lance works as follows.

Gas under pressure is supplied through pipe 1. In the prechamber 11, the gas flow is turbulized, and its vortices enter the resonator cavity 13, with the result that at the section 12 of the nozzle 10 periodic perturbations appear, which then transform into a pulsating gas flow flowing from the nozzle 10 to the surface of the melt (not shown). At the same time, disturbances occurring at section 12 of each nozzle 10 do not interact with each other, since they are isolated by the prechamber chamber 11, which prevents their mutual weakening and, as a result, allows sufficiently powerful pressure pulsations of the gas flow to be reached at the exit of each nozzle. It provides po0

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purging the efficiency of purging by accelerating the pointing of the dross and intensifying the heat and mass transfer processes in the reaction zone of the melt, as well as increasing the durability of the tuyere by reducing the accumulation of emissions and emissions on the side and end surfaces of the tuyere.

In one embodiment of the tuyere (FIG. 3), the prechamber 11 and the resonator cavity 13 are formed by nozzles 18 and 19 coaxially mounted to the nozzle 10, respectively, while the resonator cavity 13 can be limited by the toroidal surface 20, which simplifies the manufacture of the tuyere, and also due to increasing the internal diameter of the resonator cavity 13 with respect to the internal diameter of the pre-chamber 11 increases the power of pulsations of the gas flow flowing from the nozzle 10.

The use of the proposed tuyere makes it possible to reduce the blowing time by 2-2.5 minutes, increase the resistance of the tuyere by 23% and increase the yield by 0.6%.

Claims (4)

1. A melt purge lug containing concentrically arranged oxidant supply, coolant supply and discharge pipes, an end head having an oxidant tube bottom, connected by a purge nozzle to the shell, and a cavity cavity and prechambers located in its lower part, characterized in that , in order to reduce the blowing time and increase the durability of the tuyere, the nozzles are made protruding into the pre-chamber with the formation of a resonator cavity, covering the part of the nozzle that protrudes into the pre-chamber behind the bottom of the oxidant tube, and cut chennoy bottomed and the surface adjacent to the prechamber, located in the paper path above the oxidant nozzle. 2. A lance according to claim I, characterized in that the prechamber and the cavity cavity are formed by partitions located between the nozzles. 3. A lance according to claim 1, characterized in that the prechamber and the cavity cavity are formed by nozzles mounted coaxially to the nozzle. 4.Furma on PP. 2 and 3, characterized in that the cavity cavity is bounded by a toroidal surface coaxial with the nozzle. / J 15 / 7 FIG. 2 8 7 cpuzj