JPS5831005A - Relining method for blast furnace wall - Google Patents

Abstract

PURPOSE:To form a structural body stuck with granular refractories effective for relining of furnace walls on the inner side of the furnace wall by flaring the tubular leading end part fitted onto a guiding bar body which is inserted through the opening of the shell in the worn part of the furnace wall and is held there like petals by said bar. CONSTITUTION:The shell 1 in the worn part of a furnace wall is opened. If refractories 2 remain and there is a refractory wall 20, these are opened as well. A guiding bar body 5 is inserted into the furnace and an outward bending means 6 at the leading end thereof is held at the prescribed depth in the furnace by means of a supporting stand 7 or the like. A tubular body 8 provided with an arbitrary number of axial slits in the leading end part is fitted onto the body 5. When said body is forced into the furance by means of a cylinder device 10 or the like, the body 8 is bent outward from the tips thereof and is opened like petals. For example, if two tubular bodies 81, 82 are used, a stuck structural body 101 of two steps is formed in the furnace.

Description

[Detailed description of the invention] The present invention relates to a method for repairing a furnace wall in a blast furnace.

As is well known, the furnace wall of a blast furnace is constructed by constructing a refractory material inside a steel shell, but the refractory material is subject to significant wear due to contact with the charge or hot metal in the furnace.

In the past, various methods and devices have been proposed for repairing the worn walls of refractories.

However, since the inside of a blast furnace is filled with charges and the worn wall surface is often a flat surface with no undulations, for example, the worn part of the furnace wall is filled with monolithic refractories. In all conventional repair methods, the monolithic refractories had poor adhesion to the worn wall surface and easily fell off, making highly reliable repairs impossible.

The present invention solves the above-mentioned conventional problems and provides a highly reliable furnace wall repair method.

The present invention will be described in detail below based on Examples.

Now, FIG. 1 is a cross-sectional structural view showing the basic structure of a vessel for repairing the furnace wall according to the present invention in a portion filled with the contents of the furnace, and one embodiment of the apparatus.

In the figure, 1 is the furnace wall shell (hereinafter referred to as the steel shell).

2 is a refractory constructed inside the shell 1, and 3 is a charge in the furnace. Accordingly, in the present invention, first, a part of the furnace wall where damage is confirmed due to wear of the refractory 2 or red heat of the iron skin 1, or a part of the furnace wall corresponding to the worn part of the furnace wall referred to in the present invention, is determined. Open 1 to 4. For example, when the refractory 2 remains and a refractory wall 20 is formed inside the shell, the opening 4 is opened to penetrate the remaining refractory wall 20 and reach the inside of the furnace.

Next, the guide rod 5 is inserted into the furnace through the opening 4. The guide rod 5 is equipped with an outward bending tool (hereinafter referred to as the bending tool) 6 at its tip, and the bending tool 6 is inserted into the furnace until it reaches a predetermined depth and held in that state. do. In this embodiment, all of the support pedestals 7 are made to stand on the iron shell 1, and the support pedestals 7 are
The guide rod 5 is held by the guide rod 5. After the guide rod 5 is held at a predetermined position, the tube 8 is then fitted onto the guide rod 5 and pressed into the tube. The tube body 8 is.

As shown in the perspective view of FIG. 2, an arbitrary number of axial slits 9 are provided at the distal end thereof. The slit 9 may be formed in the shape of a groove with an appropriate gap, or simply in the form of a cut line. The cylinder device 10 has the tube body 8 having the slit 9 attached to the support frame 7, for example.
When a pressing force is applied in the direction of the furnace, the tube 8 is bent outward from its tip by the bending tool 6 of the guide rod 5 and opened into a petal shape, as shown in FIGS. 3 and 4. . The two-way bending tool 6 has the function of opening the distal end part Sai of the tubular body 8, which is multi-divided by slits 9 and shaped into pieces, outward. A cap body 6c having a larger diameter than the guide rod body 5 is formed at the tip of the rod body 5, and the cap body 6c and the guide rod body 5 are connected by a curved body 6a having predetermined curvatures r and f. It is made up of. Further, in front of the curved body 6a, there is a guide plate 6bl that is inserted through the slit 9 of the tube body 8, and a holding body 6b that is fitted and held in the opening 4 of the iron shell l. It is constructed so that it can be pressed inward smoothly and the tip of the tube can be reliably bent outward. In the present invention, the bending tool 6 includes the holder 6b provided as necessary.

By guiding the tube 8 with the guiding rod 5 and pressing it into the furnace as described above, the tip 8a is opened in the shape of a petal in the furnace and inserted into the furnace. On the inner side of the furnace wall, an adhesion structure 101 for irregularly shaped objects, which will be described later, is formed.

Next, FIG. 8 shows another embodiment based on the present invention. In the third embodiment, tubes 81, 82'ji of different diameters are attached to the guide rod 5 which is inserted into the furnace and fixed as in the previous embodiment.
- Two pieces are superposed and fitted onto the outside, and one piece is pressed into place. As shown in FIG. 9, the two tubes 81 and 82 thus polymerized are each opened into a petal shape at their tips and inserted into the furnace.

After the tubes 81 and 82 have been press-fitted, for example, the outer tube 82 is moved back by a predetermined amount, as shown in FIG. 10, and a two-stage adhesion structure 1 (jl) is formed on the inside of the furnace wall.

This embodiment is particularly effective in repairing a damaged part of the furnace wall where there is no charge 3 inside due to reduced scale operation, etc.
A tube body 8 holds the tip of the guide rod body 5 at a predetermined position in the furnace.
1, 82e After being press-fitted, the two-stage adhesion structure 10 is removed by retracting the outer tube 82 or by advancing the inner tube 81 and guide rod 5 toward the inside of the furnace.
It is possible to form 1. Of course, it is possible to polymerize two or more tube bodies 8 and press-fit them in the same manner as in the above embodiment, and it is possible to easily form any number of adhesion structures 101.

FIG. 11 shows another embodiment in which the multi-stage attachment structure 101'i is shaded, in which two bending tools 6x, 62df are arranged at an arbitrary interval tf at the tip of the guide rod 5. It is provided. Among the bending tools 61 and 62, the rear bending tool 62
As shown in FIG. 12, similarly to the above-mentioned holder 6b, the insertion opening 62. is provided with an insertion opening 62. which allows only the tube 81 to be inserted thereinto.
a is configured. In this embodiment, when the two overlapping tubes 81° and 82tl are pressed in, the inner tube 81 passes through the insertion opening 62a of the rear bending tool 62, and the most advanced bending tool 6] is inserted. Then, its tip end is bent outward. On the other hand, the outer tubular body 82 has its tip bent outward by the rear bending tool 62, and the outer tubular body 82 and the inner tubular body 81 correspond to the distance t between the bending tools 61 and 62. 2
A step attachment structure 1.01 is formed on the inside of the furnace wall.

Now, after the tube body 8 has been inserted into the furnace, as in the embodiments shown in FIGS. An irregularly shaped refractory 12 is loaded through the gap 11 between the irregularly shaped refractory 12 and the irregularly shaped refractory 12. FIG. 10 gold gold 13 is fixed to the opening 4 □ in order to make the cap 13
The press-fitting hose 14 of the monolithic refractory 12 was connected to ', and the monolithic refractory 12 was loaded. In addition, the guide rod 5 has two caps 1
The flange surface 13a, l) of 3 was cut or slightly inside the flange surface 13a, l), and the space between the tube body 8 and the guide rod body 5 was also filled with the monolithic refractory 12 supplied through the press-fit hose 14. The monolithic refractories 12 supplied from the gap 11 are successively press-fitted into the furnace, and at this time, the monolithic refractories J2 efficiently spread toward the furnace wall by the petal-shaped tube tip 8a.9. It adheres to worn walls such as the inside of the steel shell 1 or the inside of the refractory 2. The monolithic refractory 12 loaded between the worn wall surface and the charge 3 in the furnace is held by the stud function exerted by the adhesion structure 101 formed by the tube tip 8a, and becomes monolithic refractory. To effectively prevent objects 12 from peeling off and falling off the wall surface.

On the other hand, in a part where there is no charge 3 inside the furnace wall, the nozzle 1 is inserted through the opening 15 at the top of the furnace, for example, as shown in FIG.
6 is inserted into the nozzle, and the monolithic refractory 12 is inserted through +y16i.
When sprayed onto the worn parts of the furnace wall, the adhesion structure 101 exhibits a stud function and firmly holds the sprayed monolithic refractory 12. In particular, in this embodiment, when repairing a severely worn part, the adhesion structure 101 is grown in two or more stages to increase the thickness of the spraying of the monolithic refractory 12. This makes it possible to repair furnace walls with high reliability and long life, making it extremely effective.

As shown in the following, the present invention opens the iron skin 1 of the worn part of the furnace wall, inserts and holds the guide rod 5 through the opening 4, and then inserts the tube 8 having the slit 9 at its tip. Fit the guide rod/body 5 externally and press it in, open the tip part 88 of the pipe body in a petal shape within the entire furnace, and insert the structure 101 attached to the inside of the furnace wall.
After the adhesion structure 101 is formed, the monolithic refractory 12 is loaded between the opening 4 and the tube body 8, or the cine-shaped refractory 12 is loaded from inside the furnace. By spraying it in a planned manner, it became possible to repair the furnace wall with high reliability. 2. In the present invention, the position and number of the openings 4 in the steel shell 1, the size of the tube 8, and the length of the slit 9 are determined depending on the size and width of the worn part of the furnace wall and the degree of wear. The structure and the number of stages of the pricking structure 101 may be appropriately set and designed.

Furthermore, the present invention is not limited to the above-mentioned embodiments, and may be appropriately designed and adopted within a range that does not impair the functions and effects of the present invention. For example, a well-known cooling plate 75' is attached to the furnace wall 1, and the cooling plate often breaks and falls off when the furnace wall becomes worn out.

It is also possible to carry out the present invention by removing the damaged or fallen cooling plate and using the opening in the steel shell for mounting the cooling plate.

FIG. 6 shows an example of a repair method using the opening 40 after the cooling plate has been removed.
Further, by providing a slit in the tip 80a of the tube 80, the tip 80a of the tube opens like a petal in the furnace to form the adhering structure 101, thereby fully exhibiting the effects of the present invention.

Inserting the guide rod 5.

The position of the tab 9 bending tool 6 in the furnace depends on the degree of wear on the wall surface, the number of stages of the attachment structure 101, the gap between the wall surface and the charge 3, or the charging density of the charge 3 near the furnace wall. You can set it as appropriate. In the experience of the present inventors, after the tube tip 8ai is sufficiently opened at a position close to the wall surface as shown in FIG. If the pipe body 8 and guide rod body 5 are cut to approximately the same length and simultaneously pressed into the furnace using the cylinder device 10, the monolithic refractory 12 can be formed even if the charge 3 is densely packed up to the vicinity of the wall surface.
It was possible to form a loading space, and the loading performance of the monolithic refractory 12 and the adhesion to the wall surface were improved, which was effective. The guide rod 5 can be left in the tube body 8 even after the repair is completed as in the embodiment shown in FIG. In the body 101, the guide rod 5 remaining in the tube body 8 performs the function of holding the attachment structure 101 in the furnace. In addition, when the size of the refractory is large as in the embodiment shown in FIG. It is also possible to cool down the furnace wall after repair by inserting a filter, which is effective because the sound effects of the present invention can be further suppressed.

As detailed above, the practical effects of the present invention are very significant.

[Brief explanation of drawings]

Each figure shows an example based on the present invention. FIG. 4 is a perspective view showing an example of the tube; FIG. 4 is a rear view of the furnace wall with the tip of the tube open in the furnace; FIG. 6 is a rear view of the furnace wall. A front view of a furnace wall showing examples of different repair methods of the present invention,
Figures 8, 9, 10 and 1J. , FIG. 13 is a cross-sectional structural diagram for explaining a repair method of another embodiment based on the present invention, and FIG. 12 is a cross-sectional view taken along line AA in FIG. 11. 1・・・・・・・・・・・・・・・ Furnace wall iron skin 2・
・・・・・・Refractory 20・・・・・・・・・・・・・・・・Refractory wall 3・
...... Charge 4.40 ... Opening 5.50 ... Guide rod 6, 61.62 ... Oil fitting 7 ... ......Support frame 8, 80.81.82...Pipe body 9...
・ ・ ・ Slit 1
0... Cylinder device 11...
・・ Gap 12 ・・・Monolithic refractory 13 ・・・Base 14 ・・・・・・・・・Press-fit hose, 1il・・・・・・・・・ Opening 16 at the top of the furnace
·········nozzle

Claims (1)

[Scope of Claims] The steel shell of the worn part of the furnace wall is viewed through the opening, and after inserting and holding the guide rod with an outward bending tool at the tip, an arbitrary number of axial slits are provided at the tip. tube body. The guide rod is fitted onto the outside of the guide rod and press-fitted, and inserted between the tip of the tube and the furnace in a petal-like manner to form an amorphous refractory adhering structure on the inside of the furnace wall. How to repair blast furnace walls.