JPS6354995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for repairing a refractory-lined furnace wall such as a blast furnace.

(Prior Art) When a blast furnace or the like is used for a long period of time, the bricks inside the furnace are worn out, the cooling plate or stave is exposed, and the iron skin is also exposed. Under these conditions, troubles such as red heat and cracks in the steel skin occur frequently, making stable operation impossible. Therefore, conventionally, refractory mortar has been press-fitted to compensate for the worn parts. However, the mortar itself has weak adhesion to the steel shell or stave, especially at temperatures around 500°C, so it hardly has any adhesion, so the mortar press-in effect lasts for a very short time, lasting from a few days to about 10 days. For this reason, anchor hardware is used to hold and secure refractories such as mortar. If the construction surface is accessible to a person, the anchor hardware can be directly attached by welding or the like using a rigid material such as a Y stud to the steel plate or the like on which the refractory is to be constructed. However, if the construction surface is inaccessible, a reliable anchor hardware cannot be constructed using this method. Methods to solve this problem are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 58-99682, 58-210485, 31004-1980, and 31005-1985. There is a way. In this method, a through hole is drilled in the damaged part of the blast furnace lining from the outside of the furnace to the inside of the furnace, and the formwork support hardware is inserted into the furnace through this hole, while the formwork is inserted into the furnace through an armor hole at the top of the blast furnace. , and fix the formwork with the support hardware mentioned above.
A monolithic refractory is poured into the space between the two. In this method, a plate made of shape memory material is welded to the tip of the pipe, the pipe is inserted into the furnace at the damaged part, the plate is restored to the desired shape, and then a repair material is sprayed. It is something.
In the above method, a pipe with a slit formed at the tip is bent between an inner bending tool and an outer ring, pushed into the furnace, opened into a petal shape in the furnace, and then monolithic refractories are loaded. It is something.

(Problems to be Solved by the Invention) However, the method has the drawbacks of being complex in structure and operation, requiring time and effort, and requiring a long period of time for repair. This method is not practical because shape memory materials are still expensive. Methods (2) and (2) require laborious work such as slitting the pipe, require a large pipe pushing device, and are uneconomical in that the inner bending tool must be cut and discarded, making it impractical.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for repairing a blast furnace wall in which anchor hardware can be easily attached by extremely simple means that can be inserted into a desired construction area from outside the furnace.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms studs from plastically formed elastic wires, and bundles the tips of the studs using heat-dissipable binding means. This is inserted into the furnace through a small diameter opening formed in the wall of a refractory-lined furnace such as a blast furnace, and the binding means is dissipated by heat in the furnace to release the restraint, and each elastic wire of the stud is Repair of a refractory-lined furnace wall, characterized in that after the tip is expanded by restoring force, a monolithic refractory is press-fitted into the furnace through the small-diameter opening, and the stud is used as an anchor for the refractory. provide a method.

(Function) Studs with a desired shape are formed from elastic wires that have been plastically formed in advance, and the studs are bound into a bundle by a binding means and inserted into the furnace, so that the studs with the desired shape can be easily inserted into the furnace through the small diameter opening. can be inserted into After insertion, the binding means that bundled the elastic wires is easily burnt out or melted due to the temperature inside the furnace and disappears, and as a result, the restraint of the elastic wires is released and the elastic wires are expanded and restored in the furnace. Anchor hardware of the desired shape is formed in the furnace. When the monolithic refractory is press-fitted into the anchor formed in this manner, the monolithic refractory is supported and fixed by the anchor.

(Example) Next, the present invention will be explained in more detail with reference to Examples.

FIG. 1 is a schematic diagram showing an embodiment of the stud attachment method according to the present invention, in which a shows a state after the stud is attached, and b shows a state in the middle of the stud attachment.

The stud 1 used in this embodiment basically consists of eight elastic wires 2 that have been plastic-formed in advance and a flange substrate 3. As shown in FIG. 1a, each elastic wire 2 has a base end portion 21 and an intermediate portion 22 that extend substantially linearly, and a plastically formed distal end portion 23.
Elastic wire receiving hole 31 formed in flange substrate 3
For example, it is fixed in place by caulking or the like.
In the thus assembled state, the eight elastic wires are arranged approximately in an annular shape with respect to the flange substrate 3. The bending shape given to the elastic wire 2 in advance is such that it can constitute a preferred stud shape in the assembled state as described above, and in the illustrated embodiment, the elastic wire 2 in the assembled state has a petal shape that opens approximately radially. It is plastic-formed so that it can take on a shape of a shape. This shape is
It can be adjusted as appropriate to the equipment conditions inside the furnace at the location to be constructed, such as the shapes of cooling plates and staves if they are located nearby.

As shown in FIG. 2, the flange board 3 used in this embodiment is further formed with an insertion hole 32 for pulling out a stud, which will be described later, and a leg member or a positioning member is provided on one surface of the board 3. 33 is welded (Fig. 3).

In addition to piano wire, the elastic wire 2 used in the present invention may include a spring steel wire, other wires having hardenability, or heat-resistant wires having restoring force. It may be a thin piece of flat steel other than a wire rod, or it may have protrusions such as ribs on its outer surface.

If the melting damage of the blast furnace wall progresses and troubles such as red heat and cracks occur in the shell, the operation of the blast furnace is stopped and a small diameter opening a is drilled at the target location in the shell A. The opening diameter should be about 6 mm larger than the minimum hole diameter (for example, about 10 mm in the case of water mortar) into which an amorphous heat-resistant material such as mortar can be press-fitted. A short pipe B is attached to the outside of the furnace wall by welding to the opening a so as to surround the opening a and to be aligned with the opening a. The inner wall of the short pipe B is provided with a protrusion b ₁ to which the positioning member 33 of the flange board 3 comes into contact, as will be described later, and a nipple b to which a press-fit pipe (not shown) of monolithic refractory is connected. ₂ are formed.

Next, as described above, the stud 1 made of the elastic wire 2 and the flange substrate 3 is inserted into the short tube with its tip end bound in a bundle by a string or other binding means 4 (first stud 1). Figure b). The binding means 4 is selected to be one that is easily destroyed by heat. For this purpose, the means 4 is formed of a resin such as cotton, linen, polypropylene, or the like. The stud 1 inserted into the short pipe B advances until the leg member 33 of the flange board abuts the protrusion b ₁ on the inner wall of the short pipe B, and
It is held in that position. At this time, since the tips of the studs 1 protrude into the furnace, the binding means 4 that binds the tips of the studs 1 are easily destroyed by the heat in the furnace. Here, "disappearance" includes a phenomenon in which the binding means 4 disappears due to heat, such as burnout and melting damage. In addition, if the binding means 4 is not burnt out only by the heat in the furnace, it can be burnt out by applying a gas burner through the short tube B.

When the bundle 4 is burned out in the manner described above, the restraint on the tip of the stud 1 is released, and the elastic wire 2, which has been plastically formed in advance, is restored and expanded to form an anchor of a desired shape. In this state,
When a press-fitting pipe is connected to the nipple _b2 of the short pipe B and a monolithic refractory such as mortar is press-fitted through the press-fitting hole 34, the monolithic refractory is fixed in a suspended state by the stud 1.

The stud 1 used in this embodiment can also be constructed so that it can be easily pulled out using a pulling jig when used.

FIG. 4 is a side view of the extraction jig 5, and FIG. 5 is a front view.

The extraction jig 5 includes a handle part 51, a shaft part 52 that is fixed to the handle 51 and can be inserted into the press-fit hole 34 of the flange board 3, and a key 53 implanted in the diametrical direction at the tip of the shaft part 52. configured. When pulling out and recovering the stud 1, first drill the press-fit hole 34 with a chisel or the like, then insert the key 53 of the extraction jig 5 in alignment with the extraction insertion hole 32 of the flange board 3, and then insert the key 53 into the flange. By rotating the handle 51 after passing over the base plate 3, the key 53 is engaged with the inner wall of the flange base plate 3. By pulling the handle 51 in this state, the flange substrate 3 and the elastic wire 2 fixed thereto can be pulled out.

Note that the present invention is not limited to mortar press-fitting,
It can also be used for other refractory construction surfaces that cannot be entered inside, such as spraying construction areas, and can also be used for small hot repairs on refractory-lined furnace walls other than blast furnaces, such as short-term small repairs on hot spots in rotary kiln furnaces. It can also be applied to repairs, etc.

(Effects of the Invention) As described above, according to the present invention, it is possible to create a stud shape that matches the internal shape of the furnace, for example, the installation state of the stave, etc., and it is possible to always obtain an optimal stud shape. Further, when installing the studs, there is no need for any large-scale equipment such as a push-in frame, and the stud installation can be accomplished extremely simply and easily. Furthermore, the stud itself can be formed at low cost, making it economical. It is also advantageous in that the opening to be made in the furnace wall when installing the studs can be extremely small.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, in which a shows a state after the stud is installed, b shows a state in the middle of installing the stud, and FIG. 2 shows the stud used in the embodiment of FIG. 3 is a side view of the flange board, FIG. 4 is a side view of the extraction jig, and FIG. 5 is a front view of the same. DESCRIPTION OF SYMBOLS 1... Stud, 2... Elastic wire, 3... Flange board, 34... Press-fit hole, 4... Binding means, A... Iron shell, a
…Silver opening, B…Short pipe, b ₂ …Nipple.

Claims (1)

[Claims] 1. A stud is formed from a plastically formed elastic wire, the tip of the stud is tied into a bundle by heat-dissipable binding means, and this is inserted into the furnace through a small diameter opening formed in the furnace wall. In the furnace, the binding means is extinguished by heat to release the restraint, and the tip of each elastic wire of the stud is expanded by the restoring force, and then the monolithic refractory is press-fitted or inserted into the furnace through the small diameter opening. 1. A method for repairing a furnace wall, comprising spraying the studs and using the studs as anchors of the refractory.