KR100890808B1 - Bottom construction of bottom blown converter - Google Patents

Abstract

The present invention can be attached to the bottom of the converter in a set-type with a refractory with a refractory heavy loss of refractory loss, so that the replacement and repair work of low-load refractory can be more easily made, thereby improving the productivity and quality of molten steel It is about low installation of converter which we could improve.

In the present invention, the anchor bolt (30-1-2) is installed in the interior refractory (30-1-1), the supporting lead set (30-3-1) is installed in the lower portion, the anchor bolt (30-1) One side of -2) comes out of the support lead set (30-3-1) and the assembly plate (1-1-4) and is fixed with a nut (1-1-9), and the support lead set (30-3-) 1) is installed in accordance with the assembly hole (1-1-1) of the converter bark (1-1) to form a structure that is fixed by the assembly plate (1-1-4) from the outside, fixing bolt (1-1) -10 is a lower portion of the converter characterized in that the tension bolt (1-1-12) for drawing is installed on the assembly plate (1-1-4) fixed to the converter shell (1-1) to provide.

Description

BOTTOM CONSTRUCTION OF BOTTOM BLOWN CONVERTER}

1 is a schematic diagram of a general converter work process and equipment,

Figure 2 is a state in which reconstruction of the refractory wear worn in the conventional converter,

Figure 3 is a state diagram showing the process of blowing the general converter,

Figure 4 is a state diagram of the reinforcement work to be carried out at the time of wear of the lower portion of the general converter,

5 is an exploded perspective view of a lower portion according to the structure of the present invention;

Figure 6 is a perspective view of the assembled state of the lower portion according to the present invention,

FIG. 7 is a state diagram of removing and replacing a wear-resistant low-load refractory set of a low-mount refractory material manufactured according to the present invention. FIG. 7 is a perspective view showing a process of drawing out a worn-out low-load refractory set and drawing it out. FIG. This is a perspective view showing a state where a mounting refractory set is installed and refractories are reinforced.

Explanation of symbols on the main parts of the drawings

1: converter 1-1-1: assembly hole 1-1-4: assembly plate

1-1-10: Fixing bolt 1-1-12: Tension bolt

30-1: Interior refractories 30-2: Permanent long-term refractory 30-3: Low odor support refractory

30-4: low odor refractory 30-5: amorphous refractory 30-1-1: internal refractories                 

30-1-2: Anchor bolt 30-3-1: Support softening set 50-1: Low odor pipe

The present invention relates to the reinforcement of the lower end of the inner refractory wear worn in the converter for refining the molten iron with molten steel, in particular the drawing of the locally worn lower portion of the converter from the outside of the lower portion and to replace the wear site in the set The lower part of the converter improves so that the refractory parts of the lower part can be exchanged quickly by having a form in which the lower part of the converter is assembled in a set form.

In general, during the molten steel refining operation of the steelmaking process, the scrap metal 4-2, which is the main raw material, is put in the chute 4-1, charged to the converter 1 using the crane 9, and the molten iron contained in the ladle 6 After charging (7) to the converter (1), the oxygen is injected to the surface of the molten steel (8) through the oxygen lance (1-3) to undergo a process of refining the molten steel by a chemical reaction. In order to protect the facility of the converter (1) from the furnace reaction, the refractory of the converter builds the permanent field refractory (30-2) and the internal refractories (30-1) from the inside of the converter shell (1-1). In the lower odor area, the permanent refractories (30-2) are constructed in two stages from the bottom, the low odor support refractory (30-3) is constructed in the center, and the low odor refractory (30-4) is constructed and the internal refractories are surrounded by (30-1) is constructed in a predetermined order. In addition, a low odor nozzle (50-4) is installed in the center of the low odor refractory refractory (30-4) and is connected to the low odor pipe (50-1) through a flexible hose (50-3) outside the converter to inert gas during the blowing of the converter (50-5) is to supply the role of stirring the bath.

Low refractory portion of the refractory and the converter (1) installed in this way serves to help the stirring of the molten steel (8) in the refining process to reduce the working time and improve the quality. In other words, the low odor by blowing the inert gas (50-5) from the bottom of the furnace to promote the stirring of the strong bath provides an opportunity for oxygen and the strong bath to meet the high quality molten steel (8) in a short time It is to help produce.

This type of converter is called an LDS converter, and the odor of the converter is made by injecting the inert gas (50-5) as above, but the inert gas (50-5) does not rise directly from the iron static pressure of the molten steel and spreads or vortex or As the shaking occurs and rises, the low odor refractory (30-4) and the surrounding internal refractories (30-1) are abrasion proceeds at a much faster rate, and if the continuous wear progress is left, 30-2) is damaged, and eventually a large accident occurs through the iron bar of the converter 1 and the molten steel 8 leaks.

Therefore, the operator grasps the remaining state of the low odor refractory 30-4 of the converter 1 and the surrounding internal refractories 30-1, closes the low odor in case of abnormality, and throws or chutes the amorphous refractory 30-5. 40-1) should be put into the converter using the crane (9) to reinforce the low-wearing areas with heavy wear. The irregular refractory (30-5) is more erosive than the internally produced refractory (30-1). There is a problem that the condition is very fast and the strength is weak, so that it must be reinforced again frequently, and the quality of the molten steel 8 is difficult due to the interruption of the low odor function of the converter 1 due to the closing of the odor for the reinforcement work. As the overall refining time of the molten steel 8 becomes longer, the internal refractories 30-1 of other parts are increased, which shortens the cycle of replacing the entire refractory material, which causes a huge cost increase. Problems arise that make it difficult to achieve the purpose of Yan.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to replace the lower portion of the worn converter in a simple, quick and easy set-up, resulting in increased productivity as well as equipment accidents in advance Its purpose is to provide for converter lowering that can be prevented.

Hereinafter, with reference to the accompanying drawings, the present invention for achieving the above object will be described in more detail.

The present invention comprises a low odor refractory material of the converter (1) as a set that can be replaced, changing the low-chamber structure of the converter shell (1-1), the entire low odor containing it when the wear of the low odor refractory (30-4) It is possible to quickly exchange and install in the set type, to prevent the abnormality of the converter (1), as well as to extend the life of the converter refractory and to maintain a low odor, thereby providing a low chamfer of the converter to maintain the normal molten steel quality do.

The main configuration of the present invention is a refractory portion constituting the interior refractories (30-1-1) and the support lead set (30-3-1) installed inside the converter (1), as shown in Figure 5, The assembly plate (1-1-4) is assembled so as to prevent separation of the refractory and to be pulled out of the refractories outside the shell (1-1) of the converter (1).

The internal refractories 30-1-1 are not different from the existing internal refractories 30-1 having a rhombus shape, but in the present invention, the internal refractories 30-1-1 are made of iron anchor bolts 30 -1-2) is installed and installed, a screw thread is formed in the tip portion protruding outward of the anchor bolt (30-1-2), the internal refractories (30-) of the anchor bolt (30-1-2) The planted area in 1-1) has protrusions. The support lead set (30-3-1) installed at the lower end of the internal refractories (30-1-1) has a substantially rectangular shape, and a low odor pipe hole (30-3-2) is installed at the center thereof. In addition, the anchor bolt holes 30-3-3 are installed at regular intervals from the center, and the size of the anchor bolt holes is manufactured so that the anchor bolts 30-1-2 can pass.

The refractory material produced in such a shape has a low odor refractory material 30-4 at the center of the support lead washer (30-3-1), and a built-in refractory material (30-1-1) at its periphery. Lose. Anchor bolt 30-1-2 emerges outward of the support lead washset 30-3-1, and the low odor pipe 50-4 also passes through. The lower mounting bar (1-1) of the converter (1) is provided with a rectangular assembling hole (1-1-1) of a size through which the support lead washset (30-3-1) can pass, and bolts outwardly thereof. The hole (1-1-2) is formed, the bolt hole has a shape and size to which the fixing bolt (1-1-10) of the assembly plate (1-1-4) assembled from the outside can be assembled have. The assembly plate (1-1-4) is made of the same material as the converter bark (1-1), and is larger than the supporting lead washer (30-3-1) so that the converter bark (1-1) and a part can be stacked. It is composed. The assembly plate (1-1-4) has an assembly hole (1-1-5) for the fixing bolt (1-1-10) and the anchoring hole (1--1-2) for the anchor bolt (1-1-1) inside 1-6) are installed.

In the assembly plate (1-1-4), there is a refractory tension bolt (1-1-12) at the center between the two assembling holes (1-1-5) for the assembly bolt (1-1-10). Tightening bolt assembly holes (1-1-11) are installed.

The converter low mounting set of the present invention configured as described above is fixed to the low mounting shell (1-1) of the converter using the assembly plate (1-1-4), and the anchor bolt (30- 1-2 is to be fixed by the fixing nut (1-1-9) on the outside of the assembly plate (1-1-4). Low odor pipe (50-4) is installed in a stainless material is made of a long length so as to be connected to the flexible hose (50-3) of the lower. The low odor pipe 50-1 has a screw thread at the end thereof, which enables connection with the flexible hose 50-3, and a union 50-6 is installed at the end of the assembly plate 1-1-4. There is a small amount of space between the set of the interior refractories 30-1-1 and the general interior refractories 30-1, so that a small amount of the irregular refractory 30-1-6 is installed at the time of assembly.

Hereinafter, the operation and effects of the present invention will be described.

As shown in FIG. 7, the low odor refractory set is assembled at the outside of the converter during the low pit construction of the converter 1, and this operation is performed by reversing the converter and inserting the refractory set from the outside of the converter using a construction mechanism. It is made in the form of

The internal refractories of the converter are rhombus-shaped, and the tip part is installed in a narrower shape than the bottom part, so that it is easy to pull in. The low odor refractory set is fixed to the converter by the assembly plate (1-1-4) and the fixing bolt (1-1-10), and the internal refractories (30-1-1) and the supporting lead set (30-3-1) It is fixed to the assembly plate 1-1 -4 via the anchor bolt 30-1-2. The anchor bolt 30-1-2 has protrusions therein to facilitate the drawing from the outside when the life of the refractory reaches its end. The anchor bolt 30-1-2 has a screw thread formed at an outer side of the lower end thereof, and this part passes through the assembly plate 1-1-4 and is fixed with a nut 1-1-9 to receive a force at the time of drawing. It is supposed to be. The visceral refractory 30-1-1 is not in the form of a state in which a plurality of bonds are bonded to each other. Thus, the respective internal refractories are installed in such a way that they are combined on the support lead set 30-3-1, and assembled and drawn together at the bottom of the converter together with the support lead set 30-3-1. The assembling hole 1-1-1 of the converter bark serves to allow the support lead wash set 30-3-1 to pass therethrough. The bolt hole (1-1-2) of the converter bark is to be able to fasten the bolt (1-1-10) so that the assembly plate (1-1-4) of the low-odor refractory set.

The assembly plate 1-1-4 is fixed by anchor bolts 30-1-2 of the internal refractories 30-1-1 together with the support lead washers 30-3-1 installed therein. The anchor bolt passes through the anchor bolt hole (30-3-3) of the supporting lead washer (30-3-1) and the anchor bolt hole (1-1-6) of the assembly plate (1-1-4). It is fixed by tightening the nut (1-1-9) at its outer end. After the low odor refractory set is installed in the converter in this way, the low odor pipe 50-1 is connected and installed by the conventional method.

When the low odor refractory set of the converter installed in this way is abrasion during use and a situation that requires replacement occurs, the low odor refractory set to be replaced is prepared and the worn low odor refractory set is dismantled. At this time, by first dismantling the fixing bolts (1-1-10) and tightening the tensioning bolts (1-1-12) for the tension bolt to the internal refractories (30-1- 1) will be drawn together with the supporting lead set 30-301 supporting it. In this drawing process, to provide a gap between the viscera refractory 30-1 and the viscera refractory (30-1-1) to construct the irregular refractory (30-1-6) to help withdrawal. The low odor refractory set of drawing is completed and replaced with a new prepared bar. At this time, the irregular refractory 30-1-6 is applied to the outside of the new set of internal refractories 30-1-1. The low-odor refractory set inserted at a constant depth is completely assembled and fixed to the converter by the fixing bolt (1-1-10), after assembly, the low-odor pipe (5-1), couplers, etc. are connected and the protective cover (50-2) Will be installed and the operation will be terminated.

With this operation, it is possible to easily replace and install the low odor of the converter (1) that has a high erosion of low odor refractory and internal interior refractory, so that the repair time of the furnace body can be shortened and the low odor is maintained in good condition at all times. It is possible to prevent the deterioration.

Therefore, according to the present invention, it is possible to easily replace and repair the low odor portion, which is the most eroded portion of the refractories of the converter, thereby improving the productivity by reducing the repair time of the low odor refractory, and reducing the cost of repair materials. It can bring about savings and contribute to the quality improvement of molten steel.

Claims (1)

An anchor bolt 30-1-2 is installed in the interior refractories 30-1-1, and a support lead set 30-301 is installed at the lower portion thereof, and the anchor bolt 30-1-2. One side of the support lead set (30-3-1) and the outside of the assembly plate (1-1-4) is fixed with a nut (1-1-9), the support lead set (30-3-1) is It is installed in accordance with the assembly hole (1-1-1) of the iron bar (1-1) and forms a structure fixed by the assembly plate (1-1-4) from the outside, fixing bolt (1-1-10) The lower part of the converter characterized in that a tension bolt (1-1-12) for drawing is installed on the assembly plate (1-1-4) fixed to the furnace converter shell (1-1).

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