SU1002360A1 - Blowing tuyere of blast furnace - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular to the domain of blast furnaces and can be used to supply blast furnaces to blast furnaces.

A known blast furnace tuyere containing an air-blowing channel, around which there are two annular chambers for supplying and discharging water, and the supply chamber is equipped with a nozzle apparatus for jet-vortex supply of water to the ryl part of the tuyere 1.

This design provides improved cooling for the tuyere, but does not prevent mechanical ianos.

Closest to the invention is a blast furnace tuyere containing a water-cooled hollow body with a flange, where the air blowing channel is provided with a side outlet passing through the cooling water chamber surrounding the hot blowing channel, and it is connected to the lower part of the air blowing channel near the tuyere stigma. 2j.

Such a structure does not exclude the possibility of mechanical wear and burnout of the upper part of the tuyeres due to

Ps1-producing solid particles and liquid metal in the form of thin jets and drops. The zone of action of the melt and solid particles otduv in the lower part is limited by the diameter of the outlet, since the stream blowing at the outlet of the outlet expands slightly.

The aim of the invention is to increase the anti-abrasive and counter-burning resistance of the tuyeres.

The goal is achieved by c. the tuyere of a blast furnace containing water-oxidase S: I hollow body with a flange and a curved part, inside which

15, an air blowing channel with side branches is located; the latter are located in the axial vertical plane at an angle of 30-60 to the axis of the tuyere and are equipped with swirlers.

20

Swirls are made in the form of a plate spiral of heat-resistant stainless steel.

The taps are made protruding into the air blowing channel.

25

As it is known, the main causes of lance failure are burnout of the outer jacket of the snout part at the top and bottom (in the vertical plane) and mechanical abrasion.

30 above.

Placing the lateral taps in the axial vertical plane at an angle of 30-60 to the axis of the tuyere in the zone of greatest wear and burnout eliminates the ingress of both droplets and jets of liquid metal and solid particles onto the tuyere surface by blowing them off with air flow (coming through .

Swirls create a conical flow, thereby increasing the zone of zigocytes of the tuyere surface and increasing the efficiency of blowing. .

Making the taps partly protruding into the air blowing channel improves the air intake for blowing off abrasive particles, liquid droplets and metal jets.

At angles of inclination of the taps 30-60, the surface of the tuyere is most fully protected by a cone-shaped divergent air flow.

At the angles of inclination of the taps, less: 30, even with the maximum possible opening (by 180) of the swirling flow, the surface of the tuyere is not protected from vertically falling materials. At angles greater than 60 °, the air intake conditions deteriorate and the swirling cone-diverting flow will be directed to the blast furnace masonry, which is undesirable because of the possibility of burning and masonry wear.

Thus, the proposed design allows to increase the anti-abrasive and anti-burning resistance of the tuyeres.

The drawing shows the proposed lance, axial section.

The tuyere contains a ryl part 1, to which an inner cup is attached, forming a channel 2 of air blowing and an outer cup forming a water cooling chamber 3 inside which is an intermediate chamber 4 with a nozzle apparatus 5 for jet-vortex supply of cooling water to the ryl part 1. K intermediate chamber 4 is connected to a passage flange b pipe

7 for cooling water supply. A flange 6 is also connected to a pipe 8 for discharging cooling water and a gas pipe 9. In the inner part 1, there are plugs 10 protruding into the air channel 2, into which the evacuators 11 are inserted to twist the exhaust air flow. The taps 10 are located in a vertical plane and inclined to the axis of the tuyere at 30-60.

The work of the tuyere is to serve to blow into the blast furnace through channel 2.

8, the same channel 2 is supplied with gas through the pipe 9. During the operation of the blast furnace, the nose part of the tuyere is subjected to intense heating, especially in the axial vertical plane when the molten metal hits the surface, and abrasive wear is caused by solid material that is shed above. To prevent burnout and wear, the air from channel 2 along the outlets 10 with swirlers 11 is brought to the surface of the snout part 1. In order to improve the air intake, the outlets 10. are protruding into channel 2. The air entering the outlets 10, under the influence of the swirlers 11, receives rotational the movement outside the tuyere diverges along a tapered path and thus provides an increase in the zone of protection of the tuyere surface. At angles of inclination within 30-60, the air flow, which diverges conically, most effectively swells the surface of the tuyere from molten metal and solid particles falling on it. The cooling water through pipe 7 enters the intermediate chamber 4 with a nozzle device 5, through the inclined nozzles of which water is supplied to the inner surface of the ryl part 1 in the form of inclined jets, which contributes to the vortex movement of the entire flow into KciMepe 3 at high speed, from which it is then drained pipe 8 through flange 6.

The advantages of the proposed lance design are that by placing the taps in the zones most often exposed to the liquid metal and abrasive material, the efficiency of blowing (protection of the lance surface) increases; due to swirlers, the protection zone is increased, and due to the protrusion of the outlets into the air blowing channel, the air intake is improved, and hence the blowout is improved.

In general, the proposed lance design allows for improved anti-abrasion and anti-burning resistance.

The loss of productivity of the blast furnace due to the replacement of the tuyeres during their burnout and wear is 0.6% in the country. With the elimination of these reasons for the ousting of the lances and the volume of pig iron production of 110 million tons per year, an additional 0, 6 million tons of pig iron can be obtained.

Claims (3)

Invention Formula 1, The blast furnace blast furnace tuyere containing a water-cooled hollow body with a flange, inside of which an air channel is blown with lateral taps, so that, in order to increase anti-abrasive and anti-heat resistance, the taps are located in the axial vertical planes at an angle of 30–60 to the axis of the tuyere and are equipped with swirlers. 2. The lance. According to claim 1, that is, with the fact that the outlets are made by speaking into the channel of air blowing. 3. The lance according to claim 1, about tl and h and rota and the fact that the swirlers are made in the form of a plate spirngs of heat-resistant stainless steel. Sources of information taken into account in the examination 1. Author's certificate of the USSR 710248, cl. From 21 to 7/16, 1979. 2. Japanese Patent 48-8682, cl. 104523, 1973.