KR200175182Y1 - Flux charging hole of converter - Google Patents

Abstract

This invention is installed in the upper part of the converter in the steel making plant to increase the cooling efficiency of the secondary raw material input hole for inputting the various raw materials required for smelting the molten iron transported from the blast furnace into the molten steel. It is about.

According to the present invention, a plurality of inlet headers 41 and outlet headers 42 are divided and installed in the membrane tube 53 formed in the sub-material injection hole 11, and the round bar 51 is fixed between each membrane tube 53. It is installed, characterized in that the cemented carbide liner 52 for wear resistance is fixed to the ridge portion of the membrane tube (53).

By increasing the cooling efficiency of the sub-material input hole by the configuration and operation of the present invention as described above, productivity is increased by preventing leakage due to cracking of the cooling jacket and operation interruption, thereby reducing the quality of the product due to moisture penetration. It is possible to prevent accidents such as explosion accidents in advance, while reducing the wear and impact of secondary raw material input holes, which greatly extends the life of secondary raw material input holes, thereby significantly reducing related materials and maintenance costs. Is provided.

Description

Sub-material input hole of converter {FLUX CHARGING HOLE OF CONVERTER}

The present invention relates to an auxiliary raw material input hole of a converter, and in particular, various auxiliary raw materials required for refining molten steel transported from a blast furnace by being installed on the upper part of a converter in a steel mill. It relates to an auxiliary raw material input hole of the converter so that the cooling efficiency of the secondary raw material input hole to be injected into the converter.

Figure 1 is a schematic diagram showing the converter and OG facilities of the steel mill, Figure 2 is a schematic perspective view showing a conventional secondary raw material input hole, Figure 3 is an exploded view of a conventional secondary raw material input hole, a steel mill generally adopting a converter method of steelmaking facilities Flux Charging Hole 11 is installed between the upper part of the converter 12, that is, between the upper hood 15 and the lower hood 14, so that the molten steel conveyed from the blast furnace is smelted into molten steel. In accordance with the belt conveyor is carried out through the various raw materials stored in the hopper to be cut into the converter 12 through the secondary raw material input hole (11).

Oxygen gas recovery system (OG) for the recovery of the converter gas is configured in a closed type to prevent the intake of external air, to prevent the outflow of gas, the secondary raw material suction hole 11 is the upper hood 15 and the lower As openings provided between the hoods 14, a water cooling method in the form of a cooling jacket 33 is applied in order to prevent melting damage due to high heat.

At this time, the cooling water is introduced through the inlet side of the subsidiary material input hole 11 and various foreign substances introduced with the cooling water ejected through the nozzle 31 in the process of being discharged through the outlet side, or on the inner surface of the cooling jacket 33. If the attached scale (Scale) is settled and accumulated in the lower portion of the sub-material input hole 11, the cooling efficiency is lowered, and the sludge (34) layer precipitated and adhered to the lower portion of the cooling jacket 33 becomes thick. Blocking the nozzle 31 will interfere with the normal flow of cooling water.

As a result, the cooling efficiency decreases due to insufficient cooling water flow rate, and the temperature in the thickness direction of the cooling jacket 33 rises, whereby the thermal stress (about 33.18 kg / mm ² ) exceeds the yield point (about 12.9 kg / mm ² ) and continuously. As fatigue and breakdown progress, cracks occur in the bottom of the cooling jacket 33, and leakage of the cooling water occurs.

This phenomenon is that the coolant having a speed of about 1.4 m / s flows into the cooling jacket 33 through the nozzle 31, but the flow rate is about 0.1 m / when the cooling water flows into the cooling jacket 33 The lowering of s results in the loss of the ability of the sediment accumulated at the lower end of the cooling jacket 33 to be discharged upwards, and thus the cooling efficiency is drastically lowered.

On the other hand, when the thickness of the nozzle 31 is enlarged as a way to solve the lack of cooling water flow rate, the amount of input and input time of the sub-materials may be changed along with the modification and improvement of various peripheral devices in the installation part of the sub-material suction hole 11. Recalibration must be accompanied, which requires cumbersome procedures such as resetting operation patterns or sequences, and realistic difficulties such as re-installing the cooling water supply utility along with reviewing the capacity of the pump to determine the flow rate.

In addition, when the length of the nozzle 31 inside the cooling jacket 33 is increased, even if the sludge 34 layer is slightly thickened, impossibility of water flow due to clogging of the nozzle 31 is caused, and the length of the nozzle 31 is shortened. In this case, the cooling water passing through the nozzle 31 does not reach the lower end of the cooling jacket 33, further lowering the cooling efficiency.

Conventionally, a shock absorbing round bar 32 having a general SS (Stainless Steel) -based material is installed, but as described above, sediment is generated in the cooling jacket 33 due to a decrease in the cooling water flow rate in the cooling jacket 33. As a result, the round bar 32 is deformed due to a decrease in cooling efficiency, thereby causing a blockage in the sub-material input hole 11, or the operation of the cooling jacket 33 breaks or leaks. There is a problem that a large explosion accident occurs when water penetrates into the molten steel, and reference numeral 13 in the drawings is a skirt.

The present invention was devised in view of the above problems of the prior art, and increases the cooling efficiency by the cooling water flowing at a constant flow rate through the inside of the membrane-type jacket, prevents the deposition of foreign substances in the jacket, and the impact of secondary raw materials. The purpose is to provide a converter feedstock for the converter can reduce the wear and tear.

1 is a schematic diagram showing a converter and an OG facility in a steel mill;

Figure 2 is a schematic perspective view showing a conventional secondary raw material input hole,

3 is a development view of a conventional secondary raw material input hole,

Figure 4 is a development of the secondary raw material input hole of the converter according to the present invention.

<Description of the code | symbol about the principal part of drawing>

11: secondary raw material input hole 12: converter

14: lower hood 15: upper hood

31: nozzle 33: cooling jacket

34: Sludge 41: Inlet Header

42: discharge header 51: round bar

52: cemented carbide liner 53: membrane tube

In order to achieve the above object, in the sub-material input hole of the converter is installed between the upper hood and the lower hood of the converter to inject the sub-material in the converter, a plurality of inlet header and discharge header in the membrane tube formed in the sub-material input hole It is divided and installed, the rod is fixed between each membrane tube, the ridge portion of the membrane tube is provided with a secondary raw material input hole of the converter characterized in that the cemented carbide liner for fixing wear.

In this invention, the outer surface of the membrane tube is attached to the It features.

Hereinafter, the present invention will be described in more detail with reference to the drawings showing preferred embodiments.

4 is an exploded view of an auxiliary raw material input hole of a converter according to the present invention, as shown in the drawing, the conventional cooling jacket is integrated membrane tube (Membrane Tube) so that the cooling water introduced through the inlet side is discharged to the outlet side without changing the flow rate It is formed by the 53 type.

Inlet header (41) and outlet header (42) are divided and installed in eight places in the membrane tube (53) to prevent excessive rise of the coolant temperature together with the divided water flow of the coolant. It was made.

A round bar 51 having a diameter of about 12 mm is fixed by welding between each tube 53 to increase cooling efficiency with mutual support between the tubes 53, and to increase the ridge of the tube 53. The wear-resistant cemented liner 52 is fixedly attached to the part by welding, but is mounted by about 150 mm without integral length in view of mutual thermal stress variation, so that the weld part is formed due to the difference in mutual thermal expansion of the release material. Cracking and dropping were prevented, and when the secondary material fell, the abrasion and cracking of the tube 53 caused by the impact were prevented.

In addition, in order to facilitate installation and removal, and to prevent damage to the tube 53, an outer shell 54 made of SS material is attached to the outside of the tube 53.

Hereinafter, the operation of the present invention having the configuration as described above.

As shown in Figure 4, the cooling water circulation in order to prevent the loss of high temperature As the coolant is introduced through the inlet side to cool the sub-material input hole 11 by the coolant, the coolant flows through the membrane tube 53 to cool the surroundings, and the inlet header 41 and the discharge header 42 are separately configured. ) Prevents excessive rise in coolant temperature.

At this time, since the membrane tube 53 has a structure in which each tube is integrally connected, unlike the conventional art, the cooling tube can be cooled while the coolant flows out through the inlet side without changing the flow rate. Sedimentation of various foreign matters and formation of sludge layer are prevented at the lower part of.

Accordingly, the cooling water flows smoothly, thereby increasing the cooling efficiency of the sub-material injection hole 11, preventing leakage of the cooling water due to cracking of the conventional cooling jacket, and preventing operation interruption or explosion of the converter in advance. In addition, by extending the life of the secondary raw material input hole (11) can significantly reduce the related materials and maintenance costs.

On the other hand, in this process, the cooling efficiency is increased by the round bar 51 provided between the membrane tube 53, the membrane tube due to the impact during the input or transport of the subsidiary material by the cemented liner 52 ( 53) can prevent damage or wear.

As described above, according to the present invention, the productivity is increased by preventing leakage due to cracking of the cooling jacket and consequent shutdown due to the increase of the cooling efficiency of the sub-material input hole by the smooth flow of the cooling water, and due to moisture infiltration. The quality of the product is prevented from being prevented, and accidents such as explosions can be prevented in advance.

In addition, the wear and impact of the secondary raw material input hole is reduced, and thus the life of the secondary raw material input hole is greatly extended, thereby greatly reducing the related material costs and maintenance costs.

In the above description, the technical idea of the auxiliary material input hole of the converter according to the present invention has been described together with the accompanying drawings, but this is illustrative of the preferred embodiments of the present invention and is not intended to limit the present invention.

In addition, it is obvious that any person skilled in the art can make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (2)

In the auxiliary material input hole of the converter is installed between the upper hood and the lower hood of the converter to inject the auxiliary material into the converter, A plurality of inlet headers 41 and outlet headers 42 are divided and installed in the membrane tube 53 formed in the secondary raw material input hole 11, and a round bar 51 is fixedly installed between each membrane tube 53. , The secondary material input hole of the converter, characterized in that the cemented carbide liner 52 is fixed to the ridge portion of the membrane tube (53). The auxiliary material input hole of the converter according to claim 1, wherein an outer shell (54) is attached to an outer side of the membrane tube (53).