JPS6017001B2 - 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 shell, but the refractory material is subject to significant wear due to contact with the charge and hot metal in the furnace.

Various methods and apparatuses have been proposed in the past for cleaning the walls of worn refractories. However, since the inside of a blast furnace is filled with iron particles and the worn wall surface is often a flat surface with no undulations, for example, filling the worn out part of the furnace with monolithic refractories. With the conventional Tachibana method, the adhesion of monolithic refractories to the worn wall surface was poor, and the refractories fell off immediately, making highly reliable repairs impossible.

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

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 furnace shell (hereinafter referred to as a shell), 2 is a refractory built inside the shell 1, and 3 is a charge in the furnace.

Therefore, in the present invention, first, the parts where the refractory 2 is worn out or the iron skin 1 becomes red-hot, and where damage is confirmed on the furnace wall,
That is, the steel shell 1 corresponding to the worn part of the furnace wall referred to in the present invention is connected to the entrance 4. For example, when the refractory 2 remains and a refractory wall 20 is formed inside the shell, the opening 4 is opened so as to penetrate the remaining refractory wall 20 and reach the inside of the furnace. Next, the induction shield 5 is inserted into the furnace through the entrance 4. The bending body 5 has an outward bending tool (hereinafter referred to as a bending tool) 6 at its tip.
The bending tool 6 is inserted into the furnace until it reaches a predetermined depth and held in that state. In this example,
A support pedestal 7 is erected on the iron shell 1, and the guiding body 5 is held by the support pedestal 7. After holding the guide shield 5 in a predetermined position, the tube 8 is then pressed into the guide shield 5 with an outer iron. 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 distal end. The slit 9 may be formed in the shape of a groove with an appropriate gap, or simply divided or cut. When the tube body 8 having the slit 9 is pressed in the direction of the furnace by, for example, the cylinder device 10 mounted on the support frame 7, the tube body 8 will open as shown in FIGS. 3 and 4. is bent outward from its tip by the bending tool 6 of the guiding body 5 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 into pieces. A receiving width body 6c having a larger diameter than the yielding bar body 5 is formed at the tip of the guide bar body 5, and the receiving width body 6c and the guide bar body 5 are bent by a bending tool 6a having a predetermined curvature r.
It is constructed by connecting. Also, curved body 6a
In front of the guide plate 60 is inserted into the slit 9 of the tube body 8.
The holding body 6b which is held side by side in the opening 4 of the steel shell 1 is fixed, so that the tube body 8 can be pressed into the furnace more smoothly, and the tip of the tube body can be surely bent outward. It is designed to be attached. In the present invention, the bending tool 6 includes the holder 6b provided as necessary. Then, the tube body 8 is guided by the guide body 5 as described above)
By being press-fitted into the furnace, the tip portion 8a is opened into a petal shape by sequentially bending outward with the bending tool in the furnace, and is inserted into the furnace.

After the tubular body 8 has been inserted into the furnace, a monolithic refractory 12 is then loaded into the gap 11 between the tubular body 8 and the opening 4. FIG. 5 shows an embodiment of the loading state of the monolithic refractory 12. In this embodiment, in order to efficiently carry out the loading operation, the cap 13 is placed in the opening □4. The press-fitting hose 14 for the monolithic refractory 12 was connected to the base 13, and the monolithic refractory 12 was loaded. In addition, the guiding body 5 is
The flange surface 13a of the cap 13 was cut slightly inside the fin, and the space between the tubular body 8 and the induction shield 5 was also filled with the monolithic refractory 12 supplied from the press-fit hose 14. The monolithic refractories 12 supplied from the gap 11 are press-fitted into the furnace one after another. At this time, the monolithic refractories 12 efficiently spread toward the furnace wall by the petal-shaped open tube tip 8a, and the iron shell It adheres to worn walls such as the inside of the refractory 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 tube tip 8a, and the monolithic refractory 12 does not peel off from the wall surface. effectively prevent As described above, in the present invention, the steel shell 1 of the worn out part of the reactor is closed 4, the guide rod 5 is inserted and held through the closed hole 4, and then the pipe body 8 having the slit 9 at the tip is inserted into the guide rod. 5 and press it in, and insert the tube body tip 8a while opening it into a petal shape by sequentially bending it outward with the bending odor in the furnace, and then inserting the tube body between the entrance 4 and the tube body 8. This is characterized in that the furnace wall is repaired by loading the monolithic refractory 12.

Therefore, in the present invention, the size (width) of the worn out part of the furnace light
The position and number of the gates 4 in the steel shell 1, the size of the pipe body 8, the length of the slit 9, etc. may be appropriately set and designed depending on the steel shell 1 and the degree of wear and tear thereof. Furthermore, the present invention is not limited to the embodiments described above, and may be appropriately designed and adopted within a range that does not cover 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. 6 shows an example of a repair method using the opening 40 after the cooling plate has been removed. Also, the tip portion 80 of the tube body 80
By providing a slit in the tube a, the tip end portion 80a of the tube opens like a flower petal in the furnace, thereby exhibiting the effects of the present invention. The insertion of the induction rod 5, that is, the position of the bending tool 6 in the furnace, depends on the degree of wear on the wall surface, the gap between the wall surface and the charge 3, or the 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 8a is sufficiently opened at a position close to the wall surface as shown in FIG. If the tube body 8 and the induction shield body 5 are cut to approximately the same length as the end face and simultaneously pressed into the furnace using the ring device 10, no problem will occur even if the diamond inserts 3 are densely packed close to the wall surface. A loading space for the shaped refractory 12 could be formed, and the loading performance and adhesion of the monolithic refractory 12 to the wall surface were improved, which was effective. The guiding body 5 can be left in the tube body 8 even after the repair is completed as in the embodiment shown in FIG. For example, after the loading of the monolithic refractories 12 is completed, the guide shaft 50 may be dropped into the furnace, and a cooling plate may be inserted into the subsequent space to cool the furnace wall after repair. This is effective because it can further enhance the effects of the invention. As detailed above, the practical effects of the present invention are very large.

[Brief explanation of the drawing]

Each figure shows an embodiment based on the present invention. Figures 1, 3, 5, and 7 are cross-sectional structural diagrams for explaining the repair method of the present invention, and Figure 2 is a pipe body. FIG. 4 is a rear view of the furnace wall showing a state in which the tip of the tube body is open in the furnace, and FIG. 6 is a view of the furnace wall showing an example of a different repair method of the present invention. It is a front view. 1... Furnace iron skin, 2... Refractory, 20
・・・・・・Refractory wall, 3...Rhizoite, 4,40・
... Sekiguchi, 5, 50 ... Guide twill body, 6 ... Bending tool, 7 ... Support frame, 8, 80 ... Pipe body, 9 ...
...Slit, 10...Cylinder device, 11
・・・・・・Gap, 12・・・・Unshaped refractory, 13・
...Bag, 14...Press-fit hose. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5 Figure 7

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. The rod is fitted onto the outside and press-fitted, and the tip of the tube is sequentially bent outward with the outward bending tool in the furnace to open it into a petal shape, and then the tube is inserted into the opening. A method for repairing a blast furnace wall, characterized by loading an unshaped refractory from between the bodies.