SU1004474A1 - Blowing tuyere of blast furnace - Google Patents

Description

The invention relates to metallurgy and can be used to supply hot blast to a blast furnace.

Known to the tuyere of the blast furnace, water-cooled case which is divided by a partition into two parts - the bow and end. Water is fed to the nose, it is cooled, and then withdrawn to the end fl.

The disadvantages of this tuyere are manufacturing complexity and low reliability of operation due to body burnout.

Closest to the invention to the technical essence is a blast furnace blast furnace tuyere containing a thickened nose part connected to a water-cooled hollow body, the cavity of which is divided in the front part by an annular partition with an opening for draining water, a flange connected to the rear part of the body, a water supply pipe, located inside the cavity, and a longitudinal partition mounted opposite the outlet of the water supply tube and dividing the current and the front part of the body cavity into two parts 2.

The disadvantages of this tuyere are significant hydraulic losses during the movement of the cooler, and consequently, a decrease in the efficiency of the ohm ohl}) and the service life of the tuyere. The greatest hydraulic losses occur when the cooler enters the cavity of the nose, where there is an abrupt change in the direction of the movement 10 or 90, separation into two streams and a sudden change in the flow area; when water leaves the cavity of the nozzle, the part where two streams meet with opposite vectors

.15 speeds, which change the direction of movement by 90, at the exit of the cooler from the tuyere body through the hole in the flange with a sharp change in the flow area.

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The purpose of the invention is to increase the service life of the tuyere.

The goal is achieved due to the fact that in a blowing lance, containing a thickened nose section connected to a booster hollow body, having an annular partition with a water outlet hole in the front viacTH, a flange connected to the rear part of the body, a water supply pipe 30, located in the body cavity.

and a longitudinal ne {egoronku, installed opposite the outlet of the wave-transporting tube and delgachy -plot and the front part of the body cavity into two parts; With a taper of 20-60 facing the base of the housing cavity, the output end of the water supply tube is made in the form of a diffuser at the outlet of the cavity into the nose of the tuyere. FIG. 1 shows the proposed lance, longitudinal section; in fig. 2 shows section A-A in FIG. 1 (over the upper tide and water tube); in fig. 3 shows a section BB in FIG. 1 (lower prilyau)} in FIG. 4 is a view of B in FIG. 1 (from the flange side); in fig. 5 - flange, cut through the outlet.

The lance is a housing 1 and a flange 2 with an opening 3. The cavity of the housing 1 is divided in the front part by an annular partition 4 with an opening 5 for draining the coolant into two cavities b and 7. On the toe 8 there are l / t-shaped tides 9 and 10 forming the 11 which smoothly mate with the cooled surface of the nose 8. Tides 10 and 9 are made opposite the hole 5 for draining the cooler and the outlet of the water pipe of the tip tube 12, the end of which is made in the form of a diffuser 13 with a taper of 25. The hole 3 in the flange 2 is made in axial section tapered with cone awn 20-60 °, with a larger base of the cone facing the cavity of the housing 1.

The lance works as follows. A blast is fed through the channel of the tuyere into the furnace of the blast furnace. Cooler by. tube 12 enters cavity 7, the passage through which cools the nose part of housing 1. End execution: tube 12, in the form of a diffuser 13 with a taper of 25, and a longitudinal partition in the form of a V-shaped tide 9, forming 11 of which smoothly mate with the cooled surface of the nose 8 makes it possible to ensure a smooth entry of the cooler into the cavity 6, and such a tide 10, made opposite to the outlet aperture 5 in the annular partition 4, smooth out the cooler to the cavity 7. This design ensures a decrease in the hydraulic resistance due to t eliminating sharp turns, increases the speed of the cooler and, consequently, improves the cooling of the nose part of the housing 1. From cavity 7 through the hole 3 in the flange 2, the cooler is led out of the housing 1. Making the hole 3 taper reduces the pressure loss during transition from the cooler the cavity 6 of the housing 1 into the drainage pipe due to a smoother change in the flow area. The optimal entry angle is the hole. 3 is 20-60, since at smaller and larger angles, the loss and pressure increase dramatically. Making the output end of the tube 12 in the form of a diffuser 13 with a taper of up to 25 makes it possible to maximally reduce the pressure loss of the cooler in this area (with a larger angle of taper of the diffuser, the pressure loss of the cooler also begins to increase).

The proposed lance can reduce hydraulic losses, increase cooling rate and improve cooling. The increase in speed also contributes to the reduction of salt deposits in the cavity of the tuyere. All this increases the life of the structure. Installing the proposed tuyeres on one blast furnace with a useful volume of 1033 allows to obtain an economic effect of the order of 9., 2 thousand rubles. in year.

Claims (2)

1. Duct lance of a blast furnace, containing a thickened nose connected to a water-cooled hollow body having in the front part an annular partition with an opening for discharging the vrd, a flange connected to the rear part of the body, a water supply tube placed in the body cavity, and Longitudinal over A rod placed opposite the outlet of the water supply tube and dividing the flow and the front part of the cavity into two parts, characterized in that, in order to increase its service life, the longitudinal partition is made in the form of a V-shape tide on the bow, while opposite the outlet in the annular septum made a similar tide. 2. A lance according to claim 1, characterized in that the outlet opening in the flange is made in axial section with a taper of 20-60 facing the bottom of the body cavity, the output end of the water supply tube is made in the form of a diffuser at the outlet of the cavity into the nose part of the lance . Sources of information taken into account in the examination 1. Japanese Patent 49-45063, cl. 10 A523, 1974. 2. Authors certificate of the USSR 452241, cl. From 21 to 7/16, 1975. 9udB