KR20040024631A - A method for stacking refractories in furnace - Google Patents

Abstract

PURPOSE: A method for constructing refractories in converter is provided which improves operation productivity and molten steel output of the converter by minimizing brick construction operation in the converter and prevents safety accident by preventing workers from working in a narrow space for a long period of time. CONSTITUTION: In a method for newly constructing inner refractories worn out in a converter for refining hot metal into molten steel, the method comprises the steps of removing the crushed bricks by crushing bricks of an inner part of the converter; removing the separated metal case by separating metal case of a lower part of the converter from a main body of the converter; connecting the assembled metal cases to the lower part of the converter main body by assembling the moved metal cases after moving lower metal cases in which new bricks are constructed at a separate workshop to a lower part of the main body of the converter; and constructing wall body bricks of the converter main body next to the bricks of an inner side of the new lower metal cases so that the inner refractories worn out in the converter are newly constructed.

Description

A METHOD FOR STACKING REFRACTORIES IN FURNACE

The present invention relates to a new construction method of the internal refractories worn in the converter for refining molten iron in molten steel, more specifically, the refractory is broken and the lower end of the converter to be replaced, the new refractory in a separate place from the converter After replacing the lower part of the converter which has been built, the refractories can be repaired to improve productivity by shortening the working time, and to improve the building quality of the refractory by achieving stable work over sufficient time. The present invention relates to a method for building converter refractory materials.

In general, as shown in FIG. 1, the steelmaking process includes the molten iron 200 and the scrap metal 202, which are the main raw materials, in the chute 204 and charged to the converter 210 using the crane 206. Oxygen and argon are blown into the inside of the 210 to perform the refining operation. The molten steel 212, which has been refined, is placed in a separate water cart 214 and transferred to a subsequent process.

In this work process, in order to prevent the melting of the iron shell 220 of the converter 210, the refractories 222 is constructed inside the iron shell 220, such a refractory 222 in the converter 210 is As the last means to protect the equipment from the molten steel 212, the construction quality is a very important management matter.

Therefore, the construction of the refractory to protect the converter facility is cooled when the waste paper (use completion) of the converter 210 is cooled to crush the remaining amount of refractory and discarded, repair the converter facility and establish the converter 210 horizontal Then, the refractory construction is performed on the inner wall of the converter 210 sequentially from the bottom edge.

Such a kite and construction as shown in Figure 2, first the kite and construction of the bottom of the converter 210 is completed, and then the inner wall construction, the floor construction work is a permanent extension kite 230 on the floor of the converter 210 After building in two stages, the supporting smoke 234 of the low wicking portion 232 is built, and the built-in yeon 238 is built on the upper side thereof, and the low odor smoke 240 in the low wicking portion 232 into which argon gas is introduced. They are built to fit between the built-in kite 238 based on the number and order.

In this case, the fire retardant and the building work of the converter 210 generally require an absolute process, such as a building period with the bottom smoke of more than half of the entire process.

When the refractory construction of the converter 210 is completed as described above, the bottom portion 232 of the converter 210 is checked, the nozzle and the pipes 250 are assembled, and the inspection test is performed to assemble without leakage of molten steel and gas. You will go through the process.

Such a connection and construction process of the converter 210 according to the prior art is shown in Figure 6a). This process is first made in step 300 to crush the smoke inside the converter. Then, in the next step 310, the bottom permanent extension edge 230 of the converter 210 is built and the low support base 234 assembling process is performed, this process takes at least two days. Then, in the next step 320, the step of building the bottom built-in edge 238 on the upper side of the bottom permanent extension edge 230 is made. This process also takes approximately two days.

When the bottom construction work of the converter 210 is completed in this way, a step 330 of building the wall edge is made. This operation takes about three days, after which the soft condensation construction process is terminated (step 340).

As such, the refractory construction of the converter 210 is performed over a period of about 10 days, and during this period, the productivity of the converter 210 is significantly reduced. In other words, as the refractory building period of the converter 210 becomes longer, the molten steel production decreases, as well as the productivity of the building work is low.

And, because all the construction work is made in a narrow space of the converter 210 made integrally, the work load of the workers was large, which was a difficult task, according to which the precise construction is impossible, such as molten steel and gas leakage of low-odor equipment The risk was great.

In addition, the long-time kite and construction work in a narrow space has a problem that increases the risk of safety accidents of workers.

The present invention has been made in order to solve the conventional problems as described above, to minimize the work and construction work in the converter to shorten the working period to increase the work productivity and the molten steel output of the converter, in the narrow space of the operator for a long time The purpose of the present invention is to provide an improved method for building converter refractory materials to prevent accidents and prevent accidents.

In addition, the present invention is to improve the construction of the converter refractory to improve the construction quality of the edible by performing the edging and construction of the converter and stably perform tests such as molten steel and gas leakage in a separate large workplace. The purpose is to provide.

1 is a working state diagram shown to explain the refining operation of the converter in a general steelmaking process;

2 is an operation explanatory diagram for explaining a method for constructing converter refractory according to the prior art;

3 is an explanatory diagram for separating the bottom bar shell from the converter body and moving it on the bogie in order to carry out the method for constructing converter refractory according to the present invention;

4 is an explanatory diagram showing an operation situation in which the lower bar shell is moved to the lower side of the converter body and connected to each other in order to execute the method for constructing converter refractory according to the present invention;

5 is an explanatory diagram showing a working situation in which a lower bark is connected to a converter body in order to carry out the method for constructing converter refractory according to the present invention, and the smoke is formed on the inner wall of the converter body;

FIG. 6 is a flow chart illustrating a comparison between a confectionery construction method according to the related art and a confectionery construction method according to the present invention.

a) is a conventional method, b) is a method of the present invention.

<Description of the symbols for the main parts of the drawings>

10 .... bottom shell 12 .... converter body

18 .. Strain Relief Plate 20 .... Bolt

22 .. Mounting plate 22a .... hole

30 .... permanent extension kite 32 .... internal organ kite

36 .... Odor Protection Cover 40 .... With Stand

42 .... odor kite and 50 .... pipe

52 .... hose 210 .... converter

212 .... Molten Steel 214 .... Trolley

220 .... jacket 222 .... refractory

230 .... permanent extension and 232 .... low

234 .... with a reed 238 .... with a built-in kite

240 .... with low smoke

In order to achieve the object as described above, the present invention, in the method of newly built internal refractories worn in the converter for refining molten iron with molten steel,

Crushing and removing the smoke inside the converter;

Separating and removing the bottom of the converter from the converter body;

A new refractory body is assembled by moving the lower bar body constructed in a separate workplace under the converter body and connected to the bottom of the converter body; and

And sequentially constructing the wall edge of the converter body to the edge of the inner side of the new lower sheath, thereby providing a method of constructing a converter refractory, including newly building internal refractories worn inside the converter. .

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

As illustrated in FIG. 6B), the method of constructing converter refractory 1 according to the present invention includes first step 110 of crushing and removing the soft wires in the converter, and then the bottom bark of the converter 210. A step 120 of removing the 10 from the converter body 12 is performed.

As such, the process of separating the converter body 12 from the bottom shell 10 is to separate the lower side of the converter 210 by forming a separation part on the converter 210. For this purpose, the present invention is illustrated in FIG. As described above, the lower end portion of the converter body 12 and the upper end portion of the lower shell 10 have a structure in which the bolts 20 are assembled.

In the present invention, the main lower part of the converter 10 is not a facility to give the deformation of the converter 210, it is separated from the converter body 12 to move it to a separate place. In addition, the separating portion of the lower portion of the converter 210 is formed at the lower end of the trunnion 14, which is the support device of the converter body 12, the flange-shaped deformation preventing plate 18 inside the converter 210, the lower contact portion. Is cut at right angles, and the deformation preventing plate 18 of the converter body 12 is cut so that the holes 18a are drilled at regular intervals so as to be connected to the lower bar 10 and the assembly bolt 20. .

In addition, the bottom bar 10 of the converter 210 corresponding thereto has the same size and radius of curvature as the main body 12 of the converter 210 and is manufactured in the same shape. The assembly plate 22 provided on the upper end of the lower shell 10 is made of a flange shape so that the bolt 20 can be connected to the deformation preventing plate 18 of the upper portion, the hole ( 22a) is drilled, each of the holes (22a) is formed with a thread is configured so that the screw thread of the bolt 20 is directly coupled without using a nut during assembly.

Then, after the step 120 as described above, the new refractory is assembled by moving the lower bar shell 10 constructed in a separate workshop under the main body 12 of the converter 210 to the lower end of the converter body 12. A connection 130 is made.

In this step 130, the bottom shell 10 is prepared in advance in a separate workshop (not shown), the permanent long edge 30 is built from the inside of the lower shell 10, the inside Built-in edge 32 is constructed. In addition, the outer bottom of the bottom shell 10 is provided with a rectangular low-odor protective cover 36 on the outer surface of the steel shell 220, the inner side of the cover (36) and the supporting edge of the converter 210 and 40 The pipe 50 inserted into the low odor smoke 42 is down, the shape of the low smoke odor 42 has a rhombus-shaped structure and the material of the pipe 50 is made of stainless steel.

In addition, the front end of the pipe 50 is connected to the low odor pipe 50 is connected to the hose 52, the low odor pipe 50 is cut on the same line as the production of the bottom shell (10).

The lower bar 10 is such that the assembly plate 22 at the lower side of the converter body 12 is connected to the deformation preventing plate 18 by a bolt 20 or the like, which has a flat head bolt 20. Is screwed into the hole 22a of the assembly plate 22 through the hole 18a of the deformation preventing plate 18, so that the converter body 12 and the bottom shell 10 are firmly connected to each other.

Then, after the connection of the converter body 12 and the lower bar shell 10 is made in this way, the wall joint of the converter body 12 is connected to the edges 30 and 32 inside the new lower bar shell 10. Subsequently, step 140 is made.

The step 140 is the upper layer of the permanent long edge (30) and the built-in lead 32 of the bottom bark 10 to build a permanent long lead (60) and built-in lead 62 on the inner wall portion of the converter body (12) By continuing to build the permanent long wire (60) to the upper side of the deformation preventing plate 18, and to the upper side of the inner edge of the bottom shell (10) and the upper edge of the shell (12) built-in edge of the converter body (12) ( To build 62).

Then, the step 150 of ending the kite construction work is made.

The operation and effects of the present invention configured as described above will be described.

As shown in FIG. 3, in the method of constructing converter refractory material according to the present invention, when the refractory life of converter 210 reaches the end of its life, it is removed by crushing the leads 230 and 238 inside the converter, Removing the lower shell 10 of the converter 210 from the converter body 12 to remove it.

In this case, the operator separates the converter body 12 and the lower shell 10 by dismantling the bolts 20 connecting the deformation preventing plate 18 and the assembly plate 22 in the converter 210. . The separation of the converter body 12 and the lower bark 10 takes about 4 hours, this is a very simple operation.

Then, the new refractory is assembled under the main body 12 of the converter 210 by moving the lower bar shell 10 constructed in a separate workshop and connected to the lower end of the converter body 12. This is to prepare a fire-resistant flame reed (30), 32, 40, 42 in the workplace separately from the converter body 12, the previously prepared converter lower shell 10, using the outdoor crane 206 The bottom iron shell 10 in the built state is seated on the converter slag trolley 70 by a hook, and then moved to the lower portion of the converter 210.

The lower bark 10 of the converter 210 is installed in the permanent long yeon 30 and the supporting yeondae 40 during the pre-building, built-in yeon 32 and low-odor yeon 42 is built thereon, low odor A hose 52 is connected to the front end of the pipe 50, and a low odor pipe 50 is connected to the rear end of the hose 52.

The finished product of the converter lower shell 10 is subjected to this construction process is placed on the slag trolley 70 in the state of completing the low leakage test in advance.

In addition, the lower bar shell 10 drawn into the furnace 210 of the converter 210 is lifted and raised by the upper crane 206 in the state in which the conventional lower bar shell 10 is removed from the converter body 12. 10, the deformation preventing plate 18 and the lower plate of the lower bar plate 10, which is installed inside the bottom of the converter bark 12 is coupled to each other by the assembly bolt (20).

The connection work of the lower bark 10 and the converter body 12 is made very simply because only the bolt is fastened, it requires only about 4 hours of working time.

As described above, the converter 210 in the connected state has a deck hoist (8) using a hoist 82 for construction on the upper part of the working deck 80 as shown in FIG. 5 with respect to the inner wall of the converter body 12. 84, while gradually increasing the refractory to the refractory hoist 86 to supply the refractory to the inside of the converter 210 to complete the construction work by the worker.

On the other hand, in the process as described above, the conventional lower bark 10 is removed from the lower portion of the converter body 12 is moved to a separate workplace and the bottom permanent extension edge 30 and the built-in edge 32 and the like therein Newly constructed, after completion of the leakage test of molten steel and gas, and waiting for the next replacement work.

In this work, as the refractory exchange of the converter 210, by completing the construction of the bottom bark 10, which takes the most construction period in a short time, shortening the overall construction period required for the lead and construction work of the converter 210. It is possible to do that.

That is, according to the present invention, the refractory construction of the converter 210 is to be made over about seven days, which is greatly reduced compared to the prior art.

As described above, according to the present invention, the refractory construction of the lower end portion of the converter 210, which requires the longest period of time in the refractory construction of the converter 210, can be performed in a short time, so that the converter operation time can be extended, thereby increasing the productivity. To improve.

In addition, the softening and construction work of the bottom bark 10 is performed in a separate work place with a large space, thereby greatly improving the productivity of the construction work, and constructing and testing the construction of the refractory and other low odor supply facilities of the converter 210. It can be eliminated and secured to ensure quality construction.

In addition, the construction quality is excellent, so that not only the cost reduction due to the improvement of the refractory life can be achieved but also the productivity improvement due to the shortening of the air, and it is possible to reduce the work load of workers and to prevent the safety accident in advance. .

Claims (3)

In the method of newly building the internal refractory wear worn in the converter 210 for refining molten iron with molten steel, Crushing and removing the confections inside the converter 210; Removing the lower shell 10 of the converter 210 from the converter body 12 and removing it 120; Under the body 12 of the converter 210, the new yeon (30), 32, 40, 42 are assembled by moving the lower bar shell 10, which is built in a separate workshop to the bottom of the converter body 12 Connecting step 130; and A step (140) of successively building the wall edges (60) (62) of the converter body (12) to the edges (30) (32) inside the new lower shell (10); A method for building converter refractory, characterized in that the newly built internal refractories worn inside. According to claim 1, The converter body 12 has a flange-shaped deformation prevention plate 18 is formed at its lower end, and a flange-shaped assembly plate 22 is provided at the upper end of the bottom shell 10 is provided with a bolt ( 20) a method for building a converter refractory, characterized in that the connection is made through. 3. The converter refractory according to claim 2, wherein a thread is formed in the hole (22a) formed in the assembly plate (22) so that the thread of the bolt (20) passing through the deformation preventing plate (18) is directly coupled. How to build.