JPS6017002B2 - How to repair blast furnace walls - Google Patents

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 an iron skin, but the refractory material is subject to significant wear due to contact with the charge in the furnace and molten pig iron.

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 bags and the worn wall surface is often a flat surface with no undulations, for example, fill the worn part of the furnace wall with monolithic refractories. In all of these methods for repairing secondary structures, the adhesion of the monolithic refractories to the worn wall surface was poor, and the refractories fell off immediately, making it impossible to perform highly reliable repairs.

The present invention solves the above-mentioned conventional problems and provides a highly reliable furnace wall repair method, particularly a method that can repair exposed portions of the furnace wall surface.

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

Now, FIG. 1 is a cross-sectional structural diagram showing a basic configuration and an embodiment of the apparatus for repairing a furnace wall based on the present invention.

In the figure, 1 is a fallen iron shell (hereinafter referred to as iron shell), and 3 is a charge in the furnace.

Therefore, in the present invention, first, the part of the furnace wall where damage has been confirmed due to the refractory being worn out or the steel skin 1 becoming red-hot, that is, the part of the furnace wall that corresponds to the worn part of the furnace wall referred to in the present invention, is inspected. Sekiguchi 4
do. For example, when refractory remains and a refractory wall 20 (see FIGS. 5 and 10 described later) is formed inside the shell, the closing hole 4 penetrates the remaining refractory wall 20 and enters the inside of the furnace. Drill the hole to reach . Next, the induction shield 5 is inserted into the furnace through the opening □4. The discussion conductor 5 is equipped with an outward bending tool (hereinafter referred to as the bending tool) 6 at its tip, and is inserted until the bending tool 6 reaches a predetermined depth in the furnace, and in that state. Hold. In this embodiment, a support pedestal 7 is erected on the iron shell 1, and the guide shield 5 is held by the support pedestal 7. After the guide rod 5 is held in a predetermined position, the tube 8 is then fitted into the transfer moat 5 with an outer saddle. As shown in the perspective view of FIG. 2, the tubular body 8 is provided with an arbitrary number of axial slits 9 at its tip. The slit 9 may be formed in the shape of a groove with an appropriate gap, or simply divided or cut. If a pressing force is applied to the tube body 8 having the slit 9 in the direction of the furnace by using, for example, a cylinder plate 10 mounted on the support frame 7, the tube body 8 will be bent by the bending of the guide body 5. The tip is bent outward by the tool 6 and opened into a petal shape. In other words, the bending tool 6 has a function of opening outward the distal end 8a of the tubular body 8 which is divided by the slits 9 and becomes a piece. A receiving corner body 6c having a diameter larger than that of the discussion guiding body 5 is formed at the tip of the body 5, and the receiving corner body 6c and the guiding support body 5 are formed into a curved body 6 having a predetermined curvature r.
It is constructed by connecting with a. Also curved body 6
In front of a is a guide plate 6 that fits into the slit 9 of the tube body 8.
0, and the holding body 6b is held in the opening □4 of the iron shell 1.
The structure is such that the tube body 8 can be pressed into the furnace more smoothly, and the tip of the tube body can be reliably bent outward. In the present invention, the bending tool 6. This includes the holding body 6b that is provided as necessary. Then, as described above, the tube body 8 is guided by the guiding body 5 and pressed into the furnace, so that its tip 8a is opened in the shape of a flower petal in 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. 5 shows another embodiment based on the present invention.

In this embodiment, two tube bodies 81 and 82 of different diameters are superimposed and pressed together with outer iron into the induction shield 5 which has been inserted into the furnace and fixed as in the previous embodiment. As shown in FIG. 6, the two tubes 81 and 82 thus polymerized are inserted into a furnace with their respective ends opened in the shape of petals. Pipe bodies 81, 8
After the press-fitting step 2 is completed, for example, the outer tube 82 is moved back by a predetermined amount L as shown in FIG. 7, and a two-stage adhesion structure 101 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 a reduced scale operation, etc., and the pipe body 5 is used to hold the tip of the guide rod 5 at a predetermined position in the furnace. After press-fitting 81 and 82, a two-stage adhesion structure 101 is formed by retracting the outer tube 82 or advancing the inner tube 81 and the yielding frame 5 toward the inside of the furnace. It is possible to do so. Of course, it is also possible to polymerize two or more tube bodies 8 and press-fit them in the same manner as in the embodiment described above, and it is possible to easily form an adhering structure 101 with an arbitrary number of stages. FIG. 8 shows another embodiment for forming the multi-stage adhesion structure 101, in which two bending tools 61 and 62 are provided at an arbitrary interval at the tip of the guiding strut 5. ing.

Among the bending tools 61 and 62, the rear bending tool 62 is the ninth bending tool 62.
As shown in the figure, like the holder 6b described above, an insertion opening 62a through which only the tube 81 is inserted is formed inside the holder 6b. In this embodiment, when the two superimposed tubes 81 and 82 are pressed in, the inner tube 81 passes through the insertion opening 62a of the rear bending tool 62 and is inserted into the most advanced bending tool 61. Its tip is bent outward. On the other hand, the outer tube body 8
2 is a rear bending tool 62 whose tip is bent outward;
A two-stage attachment structure 101 corresponding to the spacing between the bending tools 61 and 62 by the outer tube body 82 and the inner tube body 81
is formed inside the furnace wall. Now, after inserting the tube body 8 into the furnace, for example, as shown in FIG.
When the nozzle 16 is inserted through the nozzle 16 and the monolithic refractory 12 is sprayed onto the worn part of the furnace wall from inside the furnace, the adhesion structure 101 exhibits a stud function, and the sprayed monolithic refractory 12 hold firmly.

In particular, in this embodiment, when repairing parts that are subject to severe wear, the thickness of the sprayed layer of the monolithic refractory 12 can be increased by forming the adhesion structure 101 in two or more stages. It is extremely effective and allows for reliable and long-life furnace wall repair. As described above, in the present invention, the steel shell 1 in the worn part of the furnace wall is closed to the opening 4, and the transfer shield 5 is inserted and held through the opening □ 4, and then the tube body 8 having the slit 9 at the tip is inserted into the guide hole 4. It is characterized in that the tube body 5 is circumscribed and press-fitted, and the tip end 8a of the tube body is inserted into the furnace with the tip portion 8a opened like a flower petal to form the adhesion structure 101 on the inside of the furnace wall. After forming the adhesion structure 101, by spraying the monolithic refractory 12 from inside the furnace, it became possible to repair the furnace wall with high reliability.

Therefore, in the present invention, the size (width) of the worn part of the furnace wall
If the position and number of the openings 4 in the steel shell 1, the size of the tube 8, the length of the slit 9, the number of stages of the attachment structure 101, etc. are appropriately set and designed according to the degree of wear and tear, etc. good. Furthermore, the present invention is not limited to the embodiments described above, and may be appropriately designed and employed within the scope of the functions and effects of the present invention. For example, a well-known cooling disk is attached to the furnace wall, and the cooling disk often breaks or falls off when the furnace wall becomes severely worn. It is also possible to carry out the present invention by removing the damaged or fallen cooling plate and using the iron shell gate for mounting the cooling plate. FIG. 4 shows an example of a repair method using the closure 40 after the cooling plate has been removed. Further, by providing a slit in the tip 80a of the tube 80, the tip 81a of the tube opens like a petal in the furnace to form the adhering structure 101, thereby exhibiting the effects of the present invention. The insertion of the guiding body 5, that is, the position of the 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,
It may be set appropriately depending on the gap between the wall surface and the charge 3 or the charging density of the charge 3 near the furnace wall. For example, when the size is large as in the embodiment shown in FIG.
For example, after spraying the monolithic refractory 12, the guided specimen 5
0 into the furnace, and inserting a cooling plate into the space afterward to cool the furnace wall after repair, which is effective and can further enhance the effects of the present invention. As detailed above, the practical effects of the present invention are very large.

[Brief explanation of drawings]

Each figure shows an embodiment based on the present invention. Fig. 1 is a cross-sectional structural diagram for explaining the repair method of the present invention, Fig. 2 is a perspective view showing an example of a pipe body, and Fig. 3 is a pipe body. FIG. 4 is a rear view of the furnace wall showing a state in which the tip of the body is opened in the furnace, and FIG. 5 is a front view of the furnace wall showing an embodiment of a different repair method of the present invention.
6, 7, 8, and 10 are cross-sectional structural views for explaining repair methods of other different embodiments based on the present invention, and FIG. 9 is A-A in FIG. 8. FIG. 1... Furnace wall shell, 2... Refractory, 20
...Refractory wall, 3...Charge, 4,4
0... Sekiguchi, 5,50... induced camphor,
6,61,62...Bending tool, 7...Support frame, 8,80,81,82...Pipe body, 9...
・Slit, 10...Cylinder device, 11...
... Gap, 12... Monolithic refractory, 13...
...Base, 14...Press-fit hose, 15...
Furnace top closing part, 16... Nozzle, 101...
...Adherent structure. Figure 1 Figure 2 Figure 4 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] 1. After opening the steel shell of the worn part of the furnace wall and inserting and holding the guide rod with an outward bending tool at its tip through the opening, insert a tube having an arbitrary number of axial slits at its tip into the guide rod. A blast furnace furnace wall characterized in that the pipe is fitted onto a rod and pressed in, the tip of the pipe is inserted into the furnace while being opened in the shape of a flower petal, and then a monolithic refractory is sprayed from inside the furnace. Repair method.