JPH0663010B2 - Blast furnace wall repair method - Google Patents

Description

The present invention relates to a method for repairing a furnace wall of a blast furnace.

[Conventional technology]

Conventionally, the method of repairing the damaged part of the furnace wall of the blast furnace is to reduce the contents of the furnace interior, expose the damaged part of the furnace wall, and then attach a protective panel to the damaged part from the inside of the furnace. There is known a method in which an amorphous refractory is sprayed on and sealed, and then the irregular refractory is press-fitted into the gap between the protective panel and the furnace wall from outside the furnace.

The above-mentioned spraying is to prevent leakage of the press-fit material, and a method of spraying after roughly sealing the gap between the peripheral edge of the protective panel and the furnace wall with a seal plate is disclosed in JP-B-61-16.
No. 402 and No. 61-47881. In these methods, after the seal plate is attached to the end of the protective panel, the end of the seal plate is pressed against the furnace wall, and the refractory is blown from the inside of the furnace to seal it. Irregular refractory is pressed into the gap from outside the furnace.

[Problems to be Solved by the Invention]

However, in the method using the seal plate as described above, since the deformability of the seal plate is small and the inner surface of the furnace wall to which the protection panel is to be attached is not generally flat, the longitudinal end of the seal plate and the furnace wall are There are many gaps between the two. If an amorphous refractory is sprayed from the inside of the furnace to the seal plate with such a gap, the gap is not effectively sealed and the gap remains.

Even if the irregular-shaped refractory is press-fitted from the outside of the furnace through the press-fitting hole provided in the furnace wall as described above, a part of the irregular-shaped refractory leaks to the inside of the furnace through the gap. As a result, the irregular-shaped refractory cannot be uniformly and densely press-filled between the protective panel and the furnace wall, and the durability and heat insulation of the furnace wall repair part deteriorate.

On the other hand, in the above-mentioned spraying to the seal plate portion, since the seal plate surface is smooth, the spray material is rebounded, the adhesive strength is low, and the spray material is difficult to become an anchor, so that the yield of the spray material is poor.

Therefore, a first object of the present invention is to very closely adhere to a wall surface having irregularities in the blast furnace to be repaired, without any gap,
Therefore, it is necessary to improve the sealing property for the irregular refractory that is then press-fitted from outside the furnace, and therefore to reliably prevent the irregular refractory that is press-fitted from outside the furnace to leak into the furnace as in the conventional case. .

A second object of the present invention is to provide a repairing method in which the irregular refractory is less repelled when it is sprayed from the inside of the furnace, and as a result, the irregular refractory has high adhesion strength and high yield.

[Means for Solving the Problems]

The first aspect of the present invention, which has solved the above-mentioned problems, is to reduce the contents of the furnace interior of the blast furnace, expose the repair portion, and attach the furnace wall protection panel to the furnace wall from the inside of the furnace, In a method for repairing a furnace wall in which an amorphous refractory is press-fitted into the gap from outside the furnace, the furnace wall side is projected to the peripheral portion of the protective panel to form a heat-resistant mesh body in a cylindrical or cross-sectional spiral shape, A flexible seal body is attached in advance, the protective panel is separated from each other, and the seal body is brought into contact with the uneven surface of the furnace wall to be repaired, and the seal body is pulled toward the iron skin side to bring the above The seal body is fixed in a deformed state following the uneven surface, and thereafter, a spraying material made of an irregular shaped refractory is sprayed into the gap of the protective panel to fill the gap, and then the protective panel It is also characterized in that an amorphous refractory is pressed into the gap between the furnace wall and the outside of the furnace. Of.

The second aspect of the invention is to reduce the contents of the furnace interior of the blast furnace, expose the repaired part, attach the furnace wall protection panel to the furnace wall from the inside of the furnace, and then form an irregular shape in the gap between the protection panel and the furnace wall. In a method for repairing a furnace wall in which a refractory material is press-fitted from outside the furnace, a peripheral wall of the protective panel is projected toward the furnace wall side, and a heat-resistant mesh body is formed into a cylindrical shape or a cross-sectional spiral shape, and the mesh body. It has a deformable amorphous refractory inside, and a flexible seal body is attached in advance as a whole, and each protection panel is separated from each other on the iron skin, and the seal body is the target of repair of the furnace wall. Of the irregular refractory in the gap of the protective panel, and then fixed in the deformed state of the seal body by following the irregular surface by pulling it toward the iron skin side. To fill the gap and then fill the gap between the protective panel and the furnace wall. It is characterized in that an amorphous refractory is press-fitted from outside the furnace.

[Action]

In the present invention, a heat-resistant mesh body made of metal or the like formed in a tubular shape or in a spiral shape in cross section is attached to the furnace wall protection panel at a peripheral surface of the furnace wall protection panel so as to project therefrom. In this case, the mesh is preferably deformable at least in its radial direction.

Using such a net, when fixed to the repair wall of the target together with the protection panel from the inside of the furnace to the furnace wall, when the net is fixed,
It deforms and adheres well along the irregularities on the inner surface of the furnace wall, and completely closes the gap between the periphery of the protective panel and the inner surface of the furnace wall. Therefore, when the amorphous refractory is sprayed from the inside of the furnace after that, a part of the irregular refractory enters the inside through the mesh of the mesh, so that the mesh becomes an anchor of the irregular refractory, and A complete seal is formed. As a result, when the irregular-shaped refractory is press-fitted from the outside of the furnace, it is possible to fill the refractory uniformly and without leakage.

Further, the reticulate body has good adhesion to the amorphous refractory, and therefore has less rebound of spraying, high adhesive strength, and improved yield of the irregular refractory.

On the other hand, in the second aspect of the invention, the heat-resistant mesh-like body is formed into a cylindrical shape or a spiral cross-section in the peripheral portion of the protective panel toward the furnace wall side, and the inside of the mesh-like body is not deformable. It has a fixed refractory, and a flexible seal body as a whole is attached in advance.

When the protective panel with this seal attached is pulled to the iron skin side and fixed to the iron skin, both the mesh body and the amorphous refractory are deformed due to the pulling and fixing, and the periphery of the protective panel and the inner surface of the furnace wall Along with closing the gap, some irregularly shaped refractory leaches from the mesh to fill even the slightest gap. Further, the mesh body also functions as a member for preventing sagging of the irregular-shaped refractory.

When the amorphous refractory material is sprayed from the inside of the furnace to the seal body, the mesh body serves as an anchor, and through the mesh body, it is well fitted to the irregular shape refractory material inside and the sealing property is improved.

[Specific configuration of the invention]

 Hereinafter, the present invention will be described in more detail with reference to the drawings.

The sealing device of the present invention is, for example, as shown in FIG.
A heat-resistant cylindrical seal body 1 made of metal wire mesh or the like is made to project to the furnace wall side at the peripheral edge of the (furnace wall) protection panel 2, that is, the lower edge and the left and right edges, and the axis of the cylinder is at each edge. Mount so that they are parallel. In this case, it is preferable that at least the seal body 1 projects outward from the peripheral edge of the protection panel 2.

The protection panel 2 to which the seal body 1 is attached is fixed to the furnace wall 3 as follows. That is, first, as shown in FIG. 2, the protective panel 2 to which the seal body 1 is fixed is hung down from the furnace top to the inside of the furnace by a wire or the like (not shown), and its feet 4 are attached from the inside of the furnace to the furnace wall 3 and the iron shell. 5 and is attached to the furnace wall 3 by fixing metal fittings 6. At this time, since the seal body 1 has a large deformability, the furnace wall 3 a of the furnace wall 3 a
It can be sufficiently deformed by following the unevenness of No. 1 and can completely occupy the gap between the peripheral edge of the protective panel 2 and the furnace wall 3.

After that, after attaching the protective panel 2 to the furnace wall 3, as shown in FIG. 3, a spraying material (unshaped refractory) 8 is sprayed from the inside of the furnace to the seal body 1 through a spray nozzle 7 to protect the protective panel. Complete the peripheral edge seal of 2.

Finally, the irregular refractory (not shown) through the press-fitting hole 9
Is press-fitted and filled into the gap S between the protective panel 2 and the furnace wall 3 to complete the repair of the furnace wall 3. In this case, since the peripheral edge of the protective panel 2 is completely sealed by the spray material 8 held and fixed to the seal body 1, the irregular shaped refractory does not leak during the press-fitting, and the gap S is uniform and precise. Will be filled.

A mesh-like body is used as the seal body in the present invention. As the mesh-like body, a wire mesh having a suitable wire diameter and a suitable mesh is formed into a cylindrical shape having a diameter of about 100 mm, for example, a cylindrical shape, or a cross section having a spiral shape. A concentric cylinder can be used. Of course, it may be a rectangular tube shape instead of a cylindrical shape. The wire diameter of this wire mesh is selected so that the seal body has an appropriate elasticity and sufficient deformability, and the size of the wire mesh is so small that the spray material can easily enter the inside of the seal body. Good to choose. As an example of such a seal body, an iron wire piercing wire mesh is formed into a cylindrical shape with a diameter of about 100 mm.
It is possible to preferably use one rounded to the circumference. Further, expanded metal or the like may be used.

As another embodiment of the seal body of the present invention, a sealable body having a deformable amorphous refractory material and a mesh body enclosing the refractory material may be used.

For example, as shown in FIGS. 4 and 5, the clay-like amorphous refractory 1b can be formed by multiply winding a mesh 1a of metal or the like in a cylindrical shape.

As the clay-like amorphous refractory used in such an embodiment, it is preferable to select a clay-like refractory having sufficient strength to be deformed and deformed by its own weight during the pot life.

Even when the embodiment shown in FIGS. 4 and 5 is adopted,
Similarly, a seal body is attached to the protection panel 2 in advance, droops down from the furnace top to the repair portion in the furnace, and is attracted and fixed to the furnace wall 3. At the time of such attracting and fixing, the mesh 1a and the irregular refractory 1b follow the irregularities of the inner surface of the furnace wall 3 to be deformed and function as a sealant for the press-fit material.

Therefore, the refractory can be press-fitted without leaking from the press-fitting hole 9 into the gap S between the protective panel 2 and the furnace wall 3 without spraying the refractory from the inside of the furnace. However, it is also possible to further spray an amorphous refractory.

In the present invention, the seal body may have the embodiment shown in FIGS. 6 to 7.

FIGS. 6 and 7 show the reticulated body 1a in a spiral shape, and a part of the reticulated body 1a is embedded in the clay-like refractory 1b.
It is intended to hold and strengthen the refractory 1b.

〔The invention's effect〕

As described above, according to the present invention, the sealing property of the protective panel is remarkably improved, the yield of the sprayed material can be improved, and regardless of the height of the blast furnace inner wall portion to be repaired,
Can easily and completely seal the protective panel.

[Brief description of drawings]

FIG. 1 is a view of a protective panel with a seal attached from a furnace wall side, and FIGS. 2 (a) and 2 (b) are elevational schematic explanatory views of a method of attaching the protective panel to the furnace wall. FIG. 4 is a plan explanatory view of the spraying state of the spraying material on the protective panel, FIG. 4 is a perspective view showing another embodiment of the seal body according to the present invention, and FIG.
6 to 7 are cross-sectional views showing other aspects of the seal body. DESCRIPTION OF SYMBOLS 1 ... Seal body, 1a ... Wire mesh, 1b ... Clay-like amorphous refractory material, 2 ... Protective panel, 3 ... Furnace wall, 5 ... Iron skin, 9 ... Press fit hole, S ... Gap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshichika Yanagibashi, No. 3, Hikari, Kashima, Kashima-cho, Kashima-gun, Ibaraki Sumitomo Metal Industries, Ltd. (56) Reference JP-A-59-100203 (JP, A) JP-A-60-5810 (JP, A) JP-A-63-127076 (JP, A)

Claims (2)

[Claims] 1. A blast furnace with a furnace interior reduced in size, a repaired part exposed, a furnace wall protective panel attached to the furnace wall from the inside of the furnace, and then an irregular refractory material in a gap between the protective panel and the furnace wall. In a method for repairing a furnace wall in which is press-fitted from the outside of the furnace, a peripheral wall of the protective panel is projected toward the furnace wall, a heat-resistant mesh is formed into a cylindrical shape or a cross-sectional spiral shape, and a flexible seal is formed. The body is attached in advance, the sealing body is brought into contact with the uneven surface of the furnace wall to be repaired in the state where the respective protection panels are separated from each other, and the uneven surface is imitated by pulling to the iron skin side. The seal body is fixed in a deformed state, and thereafter, a spraying material made of an irregular shaped refractory is sprayed into the gap between the protective panels to fill the gap, and then the gap between the protective panel and the furnace wall. Method for repairing blast furnace wall characterized by injecting amorphous refractory into the furnace from outside the furnace . 2. A furnace-shaped interior of a blast furnace is reduced in scale, the repaired portion is exposed, a furnace wall protective panel is attached to the furnace wall from the inside of the furnace, and then an amorphous refractory material is provided in the gap between the protective panel and the furnace wall. In the method of repairing the furnace wall by press-fitting from the outside of the furnace, projecting to the furnace wall side in the peripheral part of the protective panel, forming a heat-resistant mesh body in a cylindrical shape or in a cross-sectional spiral shape, and inside the mesh body. Has a deformable amorphous refractory, and a flexible seal body is attached in advance as a whole, and the seal body is attached to the iron shell with the protective panels separated from each other, and the seal body is uneven to be repaired on the furnace wall. The seal body is fixed by deforming the seal body by bringing it into contact with the surface and drawing it toward the iron skin side, following the uneven surface, and then spraying a spraying material made of an irregular shaped refractory material into the gap between the protective panels. To fill the gap and then fill the gap between the protective panel and the furnace wall A method for repairing a furnace wall of a blast furnace, which comprises press-fitting a refractory material from outside the furnace.