KR20140125489A - Filling machine and the maintenance method for converter bottom ragio - Google Patents

Abstract

The present invention relates to an inserting machine for inserting a material into a separate space between the brick of the lateral wall, and the brick of the floor of a converter; and a converter floor maintenance method using the same. According to the present invention, the inserting machine comprises: a nozzle arranged while vertically penetrating the floor; a material providing part for providing unshaped refractories to the separate space; and a material providing pipe whose one end is connected with the nozzle, and the other end is connected with the material providing part. Maintenance time can be reduced and the complete cooling of the converter is unnecessary as the separate space is filled with unshaped refractories from the outside through the nozzle inserted into the separate space. An additional converter for continuously operating is unnecessary as the maintenance time of the converter can be reduced, so consumable elements such as manufacture materials, installation costs, and the installation space generated in case the converter is additionally installed are unnecessary. Moreover, the energy for re-raising the temperature of the converter can be reduced and damage to a refractory wall caused by thermal spalling can be reduced as the converter is not completely cooled.

Description

Technical Field [0001] The present invention relates to an indenter and a maintenance method for a converter floor using the same,

The present invention The present invention relates to a pressurizer and a maintenance method for a converter floor using the same, and more particularly, to a method for maintenance of a transformer bottom, which can easily fill a space between a converter side wall portion and a bottom portion during maintenance of a converter floor, And a method for maintenance of a converter floor using the same.

Generally, a steel-making converter process is a process of removing impurities from molten iron produced in a furnace and refining them into pure molten steel. The converter to be used in this process is usually a bag-like container in which a high-temperature melt of 1600 ° C to 1750 ° C is accommodated. The container is composed of a permanent structure, a refractory material such as a built-in structure provided inside the permanent structure, .

Such a built-in ladle is formed of refractory bricks or the like having excellent heat resistance, and prevents the permanent ladder from being damaged by molten steel charged into the electric furnace. However, although it has very strong heat resistance, it can be used for repetitive processes for a long period of time, resulting in wear (damage) due to abrasion due to physical friction with molten steel, chemical and thermal erosion, and sudden temperature change. Because of the above-described variables, there is a serious accident that the permanent arc or the iron filament provided on the outside of the built-in lead as well as the internal lead is also damaged and molten steel is leaked to the outside, so that a maintenance process of periodically replacing the built- do.

At this time, the molten steel in the converter is introduced into a container such as a ladle. Then, the converter is completely cooled to an elevated temperature of about 100 ° C or lower, and then the built-in flame is disassembled, and the new flame is mounted on the floor of the converter. Next, work is performed to fill the space between the converter wall and the replaced floor. Conventionally, a person has entered a cooled electric converter and completed a converter floor replacement work by using a stamp material to fill a space between a converter wall and a floor duct.

However, the conventional replacement method is performed after the converter is completely cooled, and a cooling time of at least 4 to 5 days is required to completely cool down the converter. Therefore, to continue operation, additional transformers other than those in maintenance are required. Thus, space, cost, time, and material consumption for installing additional transformer configurations are consumed.

In addition, by completely cooling the converter, the time required for maintenance is increased, resulting in a reduction in process efficiency and productivity. In addition, thermal spalling occurs by completely cooling the converter, causing damage of the refractory wall, and energy consumption is required to re-raise the fully cooled converter.

KR 0636395 B

The present invention provides an indenter and a method of maintenance of a converter floor using the indenter, which does not require an additional transformer configuration and does not require installation space and installation cost due to the additional converter configuration in maintenance of the converter bottom.

The present invention provides a pressurizer and a method of maintaining a converter floor using the same, which can shorten the maintenance time of the converter, thereby increasing process efficiency and productivity.

The present invention provides a pressurizer and a method for maintenance of a converter floor using the same, which can reduce the energy consumed in the damage of the refractory wall due to the complete conversion of the converter and the maintenance of the converter after the maintenance.

A presser according to an embodiment of the present invention is a device for press-fitting a raw material into a spacing space between a side wall portion of a converter and a bottom portion of a converter, comprising: a nozzle arranged to penetrate the bottom portion in a vertical direction; And a raw material supply pipe having one end connected to the nozzle and the other end connected to the raw material supply unit.

At least one of the nozzles may be provided to be spaced apart from each other in the spaced space, and the material supply pipe may be connected to the nozzles to form a movement path through which the material flows.

When there are a plurality of nozzles, the plurality of nozzles may have the same or different heights, and the nozzles may include at least one of a T shape, a U shape, and a Y shape.

The raw material supply pipe may be detachably connected to the nozzle.

A method for maintenance of a converter bottom according to an embodiment of the present invention includes the steps of replacing the bottom portion and replacing the bottom portion with the bottom portion, connecting the bottom portion with the side wall portion of the converter, The process of filling the spacing space is performed by pressing the monolithic refractory from the outside through the nozzle inserted in the spacing space.

Before the step of replacing the bottom portion, the converter may be cooled to a temperature of about 200 to 300 캜.

The monolithic refractory may be discharged in both directions at the nozzle end.

After filling the space, the converter can be heated to a temperature of about 1100 to 1200 ° C to enable the process of the converter.

The indentifier according to the embodiment of the present invention and the maintenance method of the converter floor using the same can shorten the maintenance time for replacing the bottom portion of the converter. That is, when replacing the bottom portion of the converter exposed to a high temperature, the indentation type refractory is press-fitted into the spacing space by using a presser to fill the space between the bottom portion and the side wall portion. The cooling time of the converter can be shortened. Therefore, efficiency and productivity of the process can be increased by reducing the time required for maintenance of the converter.

Further, it is possible to shorten the time required for the converter to be completely cooled, so that no additional converter configuration for the operation flow is required. Thus, when the converter is additionally constructed, consumable elements such as installation space, installation cost, and materials to be manufactured are not required.

Further, the method of injecting the monolithic refractory does not require the operator to complete the cooling of the converter because the operator injects the monolithic refractory material from the outside of the converter instead of filling the space into the converter. Accordingly, it is possible to reduce damage to the refractory wall due to thermal spalling, which is caused by the complete cooling of the converter in the past, and to reduce the energy for re-heating the converter compared to the prior art.

1 is a cross-sectional view showing a general converter.
FIG. 2 is a schematic view illustrating a pressurizer according to an embodiment of the present invention and a method for maintenance of a converter floor using the same.
FIG. 3 is a flowchart showing a pressurizer according to an embodiment of the present invention and a method for maintenance of a converter floor using the same.
4 is a cross-sectional view and a plan view showing a state in which a presser according to an embodiment of the present invention is connected to a converter.
Figure 5 is a view of the nozzle of Figure 4;
6 is a view for comparing an embodiment of the present invention with a conventional method for managing a floor of a converter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Wherein like reference numerals refer to like elements throughout.

The present invention relates to a presser and a maintenance method capable of filling a raw material into a spacing space formed in a converter requiring maintenance, wherein the raw material may be a monolithic refractory.

1 is a cross-sectional view illustrating a converter according to an embodiment of the present invention. FIG. 2 is a schematic view illustrating a pressurizer according to an embodiment of the present invention and a method for maintenance of a converter floor using the same. FIG. 3 is a flowchart showing a pressurizer according to an embodiment of the present invention and a method for maintenance of a converter floor using the same.

Before explaining the method of replacing the refractory of the converter bottom according to the embodiment of the present invention, the description of the converter 100 will be briefly described.

The converter 100 is a steelmaking facility for refining pig iron made in a blast furnace. The steelmaking furnace 100 injects molten iron made in a blast furnace and blows an oxidizing gas such as oxygen into the molten iron to oxidize and remove impurities contained in the molten iron in a short time, It is a facility to produce molten steel. The converter 100 is generally divided into a side wall portion 100a and a bottom portion 100b, as shown in Fig. The converter 100 constructs the kites 104a and 104b from inside of the vases 102a and 102b to protect the facilities of the converter 100 from the in-furnace reaction. At this time, the side wall part 100a and the bottom part 100b can be divided into a side wall part 102a, a side wall part 104a and a bottom part 102b. As described above, the separately configured converter 100 is configured so that the side wall portion 100a and the bottom portion 100b can be separated and combined so as to replace the abrasive wear due to continuous operation.

At this time, in the present invention, the nozzle 210 may be disposed so as to pass through the bottom portion of the converter 100. This will be described in detail below.

On the other hand, the converter 100 is provided with a plurality of low-noise nozzles (not shown) for supplying a stirring gas to the lower portion of the converter 100 to stir the molten iron in the converter 100 when the molten iron is charged and refined. One end of the low-noise nozzle 210 is installed so as to penetrate through the bottom opening 104b to face the inside of the converter 100, and the other end of the low-noise nozzle 210 is connected to the outside of the converter And is connected to a flexible hose (not shown).

In the converter 100 having the above-described structure, the maintenance method of the converter bottom according to the embodiment of the present invention includes the steps of removing the bottom portion 100b and replacing the bottom portion 104b, To the side wall part 100a of the converter and to fill the gap G between the bottom side flap 104b and the side wall flap 104a.

When the operation of the converter 100 is continued, as shown in FIG. 2A, abrasion occurs in the bottom flap 104b. In this way, wear of the bottom flap 104b must be continuously replaced by the bottom flap 104b. Therefore, cooling of the converter 100 is required to separate the side wall portion 100a and the bottom portion 100b of the converter 100 first. Of course, in order to separate the side wall portion 100a and the bottom portion 100b of the converter 100, the molten steel accommodated in the converter 100 must be subjected to the above-described process. At this time, the converter 100 is cooled down to a temperature at which the bottom 100b can be separated (S10). The cooling temperature of the converter 100 is cooled to about 200 to 300 占 폚. However, the cooling temperature of the converter 100 is not limited to this, and the operator can cool the side wall portion 100a of the converter 100 to a temperature at which the bottom portion 100b can be separated.

When the cooling of the converter 100 is completed, the bottom portion 100b of the converter 100 is separated. The side wall portion 100a and the bottom portion 100b may be connected by a bolt-nut coupling structure or may be formed by a wedge coupling structure in which projections are inserted and fixed. The method of joining the side wall portion 100a and the bottom portion 100b is not important in the present invention. After the cooling of the converter 100, as shown in FIG. 2B, the bottom portion 100b connected to the side wall portion 100a (S20). At this time, a worn bottom flap 104b is disposed on the bottom flap 102b of the bottom portion 100b.

When the bottom portion 100b is separated, as shown in FIG. 2C, the new bottom portion 100b is replaced with a new one (S30). Then, the bottom portion 100b is joined to the side wall portion 100a again (S40). At this time, when the side wall portion 100a and the bottom portion 100b are coupled after the stitches are exchanged, a spacing gap G is generated between the side wall portion stitches 104a and the bottom stitch portions 104b. In order to fill the gap G formed in this way, conventionally, a worker directly goes into the inside of the converter to apply a stamp material to the gap G to fill the gap. However, in the present invention, as shown in FIG. 2 (d), the indentifier 200 is connected to the bottom portion 100b of the converter 100 to fill the gap G.

In this way, the indentifier 200 connected to the converter bottom portion 100b is operated in order to fill the gap G (S50). At this time, the indentifier 200 will be described in detail later. When the indentifier 200 connected to the bottom portion 100b is operated, the raw material is press-fitted into the spacing space G (S60). At this time, the raw material press-fitted into the spacing gap G is a monolithic refractory material, and the refractory material having no predetermined shape is press-fitted so that the monolithic refractory material can be press-fitted according to the shape of the spacing gap G to form a shape.

When filling of the irregular refractory in the spacing space G is completed (S70), operation of the indentifier 200 connected to the bottom portion 100b is stopped. Then, the operation of raising the temperature of the converter 100 to a predetermined temperature is performed for re-operation of the converter (S90). At this time, the temperature at which the converter 100 is heated may be raised to about 1100 to 1200 ° C. That is, the temperature of the converter 100 can be raised to the temperature of the converter 100, which is generally required to be maintained in operation of the converter 100.

Hereinafter, the indentifier 200 provided to fill the gap G between the bottom 100b of the converter and the side wall 100a will be described with reference to FIGS. 4 and 5. FIG.

4 is a cross-sectional view and a plan view showing a state in which a presser according to an embodiment of the present invention is connected to a converter. Figure 5 is a view of the nozzle of Figure 4;

The indentifier 200 is provided to press the monolithic refractory into the spaced space G between the sidewall portion 104a of the converter 100 and the bottom portion 104b of the converter 100. [ The indentifier 200 includes a nozzle 210 disposed to vertically penetrate the bottom portion 100b, a raw material supplying portion 250 for supplying the raw material to the spacing space G, a nozzle 210, and a raw material supplying portion 250 And a raw material supply pipe 230 connected to the raw material supply pipe 230.

The nozzle 210 may be disposed within the converter 100 by passing the bottom portion 100b of the converter 100 in the vertical direction and discharging the raw material. That is, as shown in FIG. 5, the nozzle 210 may extend through the bottom portion 100b and extend from the top surface of the bottom portion 100b by a predetermined length. At this time, the nozzle 210 of the present invention may be connected to the raw material supply pipe 230 by using a T-shaped nozzle and having one end penetrating the bottom part 100b and having an increased length than the bottom surface of the bottom part 100b And the other end is divided into two directions as shown in an enlarged view in FIG. 5 (a) so that the monolithic refractory supplied into the nozzle 210 can be discharged to both sides. When the nozzle 210 is discharged in both directions, it is possible to shorten the time required to fill the gap G, and it is possible to reduce the time required to fill the gap G in the entire region of the spacing G as compared with the case where the monolithic refractory is discharged in one direction. It is preferable that the nozzle 210 has a shape capable of press-fitting the raw material in both directions. Accordingly, although the T-shaped nozzle is used in the present invention, the shape of the nozzle 210 is not limited thereto, and various types of nozzles such as a U-shape and a Y-shape may be used. In the present invention, it is shown that the irregular refractory is press-fitted in both directions to fill the spacing gap G, but the irregular refractory may be press-fitted in a direction more than two directions.

Meanwhile, at least one or more nozzles 210 may be provided as shown in the drawing. In the present invention, three nozzles 210 are provided and are spaced apart from each other. As described above, when a plurality of nozzles 210 are provided, the time for filling the gap G can be shortened. In addition, when the unshaped refractory is injected through the nozzle 210, if the nozzle 210 is clogged, it is possible to continuously inject the monolithic refractory through the other nozzle. Therefore, the number of nozzles 210 is not limited.

When a plurality of nozzles 210 are provided, each of the nozzles 210 may have the same height or may have different heights. 5 (b), the nozzle 210 has a height of h compared to the height H of the bottom portion 104b. However, when a plurality of nozzles are provided, the nozzle has a height h Can be manufactured to a height higher or lower. At this time, when the nozzles 210 are formed with different heights, the monolithic refractory can be injected according to the height of the spacing gap G. That is, at the initial stage of pressurizing the monolithic refractory, the monolithic refractory may be press-fitted using a nozzle having a low height and the monolithic refractory may be pressed through a nozzle having a different height after the monolithic refractory is press- . As described above, when the nozzles are made different in height and pressurized into the monolithic refractory, the process can be performed more stably.

The raw material supply pipe 230 forms a moving path of the monolithic refractory supplied to the spacing space G and is connected to the nozzle 210 at one end and to the raw material supply unit 250 at the other end. When the plurality of nozzles 210 are provided, the number of the nozzles 210 may be as many as the number of the nozzles 210 to interconnect the material supply unit 250 and the nozzles 210, the other end connected to the raw material supply unit 250 may be divided into a plurality of raw material supply pipes 230a, 230b and 230c so as to be connected to the respective nozzles 210 at a predetermined distance, have.

A connection member 220 may be provided between the nozzle 210 and the raw material supply pipe 230 to connect the nozzle 210 to the raw material supply pipe 230. That is, in the present invention, when the nozzle 210 is disposed in the spacing space G of the converter 100 and the indefinite refractory is to be press-fitted into the spacing gap G, the raw material supply pipe 230 and the raw material supply unit 250 And is connected to the nozzle 210 so that the monolithic refractory is discharged from the nozzle 210 into the spacing G. [ Accordingly, the nozzle 210 and the material supply pipe 230 can be formed to be detachable. When the maintenance of the converter 100 is not progressed by the connection member 220, the connection member 220 is separated to separate the nozzle 210 from the raw material supply pipe 230, The nozzle 210 and the raw material supply pipe 230 may be connected to each other.

The raw material supply unit 250 is provided outside the converter 100 and is provided to supply the monolithic refractory into the converter 100. That is, the raw material supply part 250 is provided to supply the monolithic refractory material between the bottom part 104b of the converter 100 and the side wall part 104a. The raw material supply unit 250 may be a device capable of receiving a monolithic refractory material and continuously supplying a certain amount of refractory material.

The press-in device 200 thus formed is used to pressurize the monolithic refractory into the space G in the converter 100 to maintain the bottom 100b of the converter 100, The maintenance time can be shortened and the maintenance can be performed in a stable environment.

Hereinafter, the effect of the difference will be described in more detail by comparing the bottom refractory replacement method of the present invention in comparison with the conventional bottom refractory replacement method.

6 is a graph comparing an embodiment of the present invention with a conventional converter bottom refractory replacement method.

Referring to FIG. 6, in the method of replacing the refractory of the bottom according to the embodiment of the present invention, the time for cooling the transformer bottom may be shorter than that of the related art during the maintenance of the transformer bottom. That is, as shown in the graph, the converter has been cooled to about 25 to 100 DEG C because the operator has conventionally entered the inside of the converter to replace the openings of the converter bottom and fill the space between the converter bottom and the wall. It takes about 4 ~ 5 days to cool down the converter in the above temperature range, and a cooling time of about 7 days is required at the maximum.

However, in the present invention, there is no need for a process for the operator to enter the inside of the converter in order to fill the spacing space between the converter bottom and the wall portion. Therefore, only the cooling of about 200 to 300 DEG C is required so that the converter can be replaced with the bottom of the bottom portion. Since the time required for cooling the converter by the temperature can be reduced within 24 hours, the time required for cooling can be shortened by about 50% or more.

Also, in the graph, after the space filling operation is completed, a process of raising the temperature of the converter to perform the converter process is required. Thus, in order to re-raise the temperature of a fully cooled converter, a long-time heating step is required. However, in the present invention, since the converter has a higher temperature than the conventional one, the time required for the re-heating can be saved.

As described above, the method of replacing the refractory of the converter bottom according to the embodiment of the present invention can replace and fill the burning and refractory of the converter without completely cooling the converter. Therefore, it is unnecessary to require an additional converter configuration in order to prevent the operation from being interrupted due to the time required for the conventional converter complete cooling. In addition, it is possible to reduce the time for cooling the converter and the time for re-turning the converter, thereby increasing the productivity of the process.

And, since the amount of energy required for re-heating the converter can be reduced, the cost of replacing the refractory of the converter bottom can be reduced.

Lastly, since the thermal spalling caused by the cooling and heating operation of the converter can be reduced as compared with the prior art, the life of the converter can be increased, and the number of times of maintenance can be reduced.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

100: Converter 100a:
100b: bottom portion 102a: side wall portion
102b: Bottom iron piece 104a: Side wall part
104b: bottom part and 200: presser
210: nozzle 230: raw material supply pipe
250: raw material supply part G: spacing space

Claims (8)

An apparatus for press-fitting a raw material into a space between a side wall of a converter and a bottom of a converter,
A nozzle disposed vertically through the bottom portion;
A raw material supply unit for supplying the raw material to the spacing space; And
And a raw material supply pipe having one end connected to the nozzle and the other end connected to the raw material supply unit. The method according to claim 1,
Wherein at least one of the nozzles is disposed apart from each other in the spacing space,
Wherein the raw material supply pipe forms a moving path through which the raw material moves and is connected to the nozzles respectively. The method of claim 2,
When there are a plurality of nozzles, the plurality of nozzles are formed with the same or different heights,
Wherein the nozzle comprises at least one of a T-shape, a U-shape, and a Y-shape. The method according to claim 1 or 2,
And the raw material supply pipe is detachably connected to the nozzle. A method of maintaining a converter floor,
Removing the bottom portion and replacing the bottom portion;
Joining the bottom portion with the side wall portion of the converter; And
And filling a gap between the bottom portion and the side wall portion,
Wherein the step of filling the spacing space is performed by press-fitting the monolithic refractory from the outside through the nozzle inserted in the spacing space. The method of claim 5,
Wherein the converter is cooled to a temperature of about 200 to 300 캜 before the step of replacing the bottom portion of the furnace. The method of claim 5,
And wherein the at least one nozzle end is bi-directionally discharged. The method of claim 5,
Wherein the converter is heated to a temperature of about 1100 to 1200 占 폚 to enable the process of the converter after filling the space.

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