JP2648705B2 - Converter lining structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a converter lining structure, and more particularly to a lining structure for a converter furnace port narrowing portion.

[0002]

2. Description of the Related Art A converter is known as a facility for oxygen blowing of hot metal for decarburization and dephosphorization. A large amount of oxygen is used for this blowing, and the hot metal and slag in the furnace show a movement to overflow in order to stir the hot metal in the furnace.The purpose of reducing this overflow as much as possible and the recovery of gas blown into the furnace In order to carry out the process efficiently, the shape of the furnace opening is reduced. The lining structure of the furnace port drawing portion has a permanent lining of 100 to 150 mm inside the steel shell and a wear lining of 400 to 600 mm inside the inside. Permanent lining is fixed with metal because the lining thickness is thin so that it easily falls off, but wear lining does not have a sufficient fixing method, and it is usual to hold it with tapering force between circumferential bricks is there.

[0003] The metal or slag blown out at the time of blowing is adhered to the surface of the furnace port narrowed portion. As a method for removing the adhered material, there is a dissolution removal method using oxygen, but it requires a lot of time. For this reason, it is common practice to suspend a large piece of metal or the like after partial cutting with a crane and to hit it against the inside of the furnace to drop it. This pushing-down operation also damages the lining of the furnace port narrowed portion at the same time, and the lining material and the metal fall off at an early stage. Dropping of the lining at the furnace opening narrows the deformation of the steel due to the increase in the temperature of the steel, and if left as it is, it will lead to an accident of melting the steel. However, the frequency of construction is very large, every 2 to 3 charges, which is a very difficult task. Japanese Utility Model Application Laid-Open No. 63-199152 discloses a method of pulling the wear lining by providing a pulling metal at the furnace opening for the purpose of preventing the wear lining from falling off.

[0004]

As described above, the squeeze port lining has an overhanging structure as described above, so once the bricks fall out, the entire lining expands. Therefore, repairs such as spraying must be performed frequently. However, since this repair method involves hot work under high temperature, it is not preferable to frequently perform the repair method because the work load is high and the operation rate of the operation is reduced. On the other hand, a method is disclosed in which a pull metal is provided on the steel shell side of the furnace port drawing portion to prevent the wear lining from falling off, but this method is a method of fixing and holding the wear lining through the permanent lining. At the same time, it is necessary to adjust the height and the horizontal direction with respect to the hardware at each stage during the furnace construction work, and there is a problem that the furnace construction efficiency is greatly reduced.

[0005] The method of fixing and holding the wear lining by penetrating the permanent lining from the iron shell is based on the fact that the expansion behavior of the iron shell and the wear lining influences the permanent lining through the holding metal, so that the joint of the permanent lining is loosened. It is feared that the occurrence of ingots and infiltration of bullion into joints will progress. Furthermore, permanent lining is to prevent hot metal and molten steel from reaching the steel skin as the last fort in case the wear lining should be damaged or fall off. It is a factor that induces skin erosion trouble and cannot be said to be a sufficient measure.

[0006] The lining damage of the furnace opening portion has a problem due to the adhesion of the metal. However, even in a normal operation, the expansion amount of the steel shell and the brick is different. There is also a problem that occurs when a gap is formed in the portion or the portion is held down by an iron skin. The present invention is advantageous for preventing the lining from being loosened due to the expansion and contraction of the converter furnace body, improving the strength of the wear lining against the impact caused by the metal slab removal at the furnace opening, and further preventing the steel shell from being damaged during operation. It is an object to provide means for solving the problem.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a furnace port drawing section.
Iron plate members are buried on both sides of each brick of the wear lining.
And connecting the iron plate members by welding.
Converter lining structure. In addition, the present invention relates to
Fill at least one side of each brick of the air lining with steel.
And welding the steel materials to connect them.
It is a lining structure.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention, connecting each brick mutual wear lining constituting the lining of the throat aperture portion, are embedded iron plate member on both side surfaces of the upper Symbol each brick specifically, the iron plate member A steel material is buried on at least one surface of each of the above bricks by welding or connecting, and the steel material is welded and connected, so that bricks on both sides of each stage of the wear lining constituting the lining of the furnace port drawing portion are provided. Since they are interconnected, the bricks are integrated into a ring and have a strong structure.

[0009] An iron plate member is embedded in the brick, and
In a mode in which the members are welded and connected, a metal plate is embedded in both side surfaces of the brick at the time of manufacturing the wear brick, and the metal plate is welded and fixed at the time of furnace construction. This metal plate is preferably one having a thickness of 1 to 2 mm in consideration of abnormal erosion and welding strength of a brick joint portion, but may have a greater thickness. It is best to connect and fix all of the bricks composing the wear lining of the furnace port drawing part, and if the first stage is fixed in the entire circumferential direction, the second stage is not fixed, the third stage is fixed in the circumferential direction As described above, even when the non-fixed brick is sandwiched by the bricks whose entire circumference is fixed, a considerable effect can be obtained.

Further, in the present invention, since only the wear lining is integrated by welding or the like to form a strong lining, the permanent lining can be constructed without any defect, so that the construction can be performed in a short time. In addition, even if the wear lining is worn out, there is no defective part of the permanent lining, so that there is no trouble of melting of the iron shell. In addition, since the expansion behavior of iron shell and refractory is different, there is a gap due to this expansion difference at the furnace mouth narrowed part, but permanent lining is generally fixed with support metal from steel and follows the steel It moves, but the wear lining is uniquely integrated and unaffected by this, falling off with the loosening of the brick,
In addition, metal intrusion into the brick joint does not occur. Further, since the bricks constituting the wear lining are integrated by welding or the like, there are many advantages such that the furnace body does not loosen due to tilting after the furnace is built.

[0011]

FIG. 1 shows a lining configuration of a narrowed part of a furnace port of a 250-ton converter. The lining thickness of the furnace port drawing portion is 114 mm for the permanent lining portion 2 and 540 mm for the wear lining portion 3. The permanent lining 2 is made of MgO-based fired bricks and uses mortar for joints, while the wear lining 3 is made of MgO-C-based bricks and implements an empty-mesh foundation furnace that uses nothing at the joints. FIG. 2 shows a typical iron plate 4 embedded brick 5 constituting the wear lining 3. The shape of the brick 5 is 150 mm in height, 540 mm in length, and width is 150 mm to 1
A 45 mm-tapered iron plate 4 having a height of 145 mm, a length of 500 mm and a thickness of 2 mm was embedded in both sides of this brick, and the folded pieces of the iron plate 4 were embedded and manufactured.
This 2 mm iron plate had a structure in which the upper part was lower by 5 mm than the brick surface.

The furnace was constructed in a ring shape at each stage, and after the construction, the upper end of the embedded iron plate 4 at the joint was welded. The welding length is 4 from the permanent lining 2 side of the brick 5.
As shown in FIG. 1, almost all of the furnace port narrowed portions were fixed at 00 mm. In the welded portion, the portion where the overlay was protruded from the upper surface of the brick was polished to prevent the expansion of the side joints of the bricks on top. FIGS. 3 and 4 show a modification of the embedded iron plate 4. Even if the steel material 6 such as a square bar is embedded in the side surface or the upper surface, it is sufficient that integration by welding is possible. 5 and 6, the same connection effect can be achieved even in a mode in which a notch groove 7 is formed in the brick upper surface portion or side surface portion, and a cotter member is penetrated and connected to the notch groove 7.

[0013]

According to the present invention, the bricks constituting the wear lining are connected and fixed by welding or other means to form an integrated structure. As a result, there is no dropout due to the loosening of the lining in the initial stage of operation, and the bricks in the furnace opening drawn portion fall off. The service life up to 1000 times has been improved from the conventional 1000 times. In addition, even if the wear lining was dropped, the permanent lining was healthy, so that iron welding troubles were reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of a lining structure of a converter furnace port drawing portion,

FIG. 2 is a perspective view showing an iron plate embedded brick constituting the wear lining of the present invention;

FIG. 3 is a perspective view showing a modification of another embedded iron plate according to the present invention;

FIG. 4 is a perspective view showing still another modified example of the embedded iron plate of the present invention;

FIG. 5 is a perspective view showing a state in which a notch groove is formed in a brick upper surface portion of the present invention;

FIG. 6 is a perspective view showing a state in which a notch groove is formed in a side surface portion of a brick according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 converter shell 2 permanent lining 3 wear lining 4 embedded iron plate 5 brick 6 embedded steel 7 cutout groove

Claims (2)

(57) [Claims] 1. Each lens of a wear lining of a furnace port drawing section
An iron plate member is buried on both sides of the gas, and the iron plate member is welded.
A converter lining structure characterized in that the converter lining is connected. 2. The lens of the wear lining at the furnace port drawing section.
A steel material is buried on at least one surface of the gas, and the steel material is welded.
The converter lining according to claim 1, wherein the converter lining is connected.
Structure.