JP4579150B2 - Blast furnace furnace block defect inspection method and defect repair method - Google Patents

Description

  In the present invention, when a plurality of blocks having a brick layer or the like in advance are manufactured in a place other than the blast furnace foundation, and the plurality of blocks are stacked on the blast furnace foundation to construct or repair a blast furnace body. The present invention relates to a defect inspection method for inspecting whether or not a defect has occurred in the block, and a defect repair method thereof.

  A blast furnace is a vertical furnace composed of brickwork. In this blast furnace, iron ore containing 50 to 60% iron, pellets, combustion ore, etc., alone or in combination, and raw materials such as limestone and coke, which are solvents for removing impurities, are input from the top. The Then, hot hot air is blown from the tuyere arranged on the lower circumference of the furnace, whereby the raw material descending from the top of the furnace is heated, reduced and melted to become pig iron and collected on the hearth. The pig iron collected in the hearth is periodically taken out of the furnace through a tap hole provided in the lower part of the furnace.

Here, FIG. 1 schematically shows a structure in the vicinity of the hearth of a general blast furnace body. In FIG. 1, a blast furnace 100 includes a base 110, a substantially cylindrical iron skin 120 erected on the base 110, and a cooling layer provided so as to cover the inside of the furnace of the base 110 and the iron skin 120. 130, a stamp material layer 140 laminated on the cooling layer 130, and a brick layer 150 laminated on the stamp material layer 140 and in a state of covering the inner surface above the center of the side surface of the iron skin 120. Configured. Further, in FIG. 1, 160 indicates a hearth, 170 indicates a tuyere, and 180 indicates a taphole.
The cooling layer 130 has a structure in which, for example, a water cooling pipe for circulating cooling water is embedded in a metal panel. The stamp material layer 140 is a layer formed by compressing high-conductivity refractory powder, for example, carbon powder at high density.

The brick layer 150 is formed by combining a plurality of refractory bricks with high accuracy. Specifically, the refractory brick in the hearth 160 is composed of a plurality of furnace bricks 151 constituting a disk-shaped furnace bottom surface, and a plurality of vertically long stacks stacked on the furnace brick 151. Brick 152, a plurality of middle bricks 153 laminated on the vertical brick 152, and a plurality of ring bricks laminated on the furnace brick 151 and surrounding the outer periphery of the vertical brick 152 and the middle brick 153 154. These various bricks are formed of carbon bricks having high thermal conductivity, high corrosion resistance, low porosity and homogeneous, and the surface is highly polished. And it is closely combined with no gap in a state where mortar is applied between adjacent bricks.
The morning glory brick 155 stacked above the ring brick 154 is made of low-porosity clay, high-alumina brick, carbonaceous brick, or the like.

  During operation of such a blast furnace 100, the hearth 160 reaches 1500 ° C. or more, and the brick layer 150 in the hearth 160 melts from the inside of the furnace. The blast furnace 100 reaches the end of its life when the melting damage of the brick layer 150 has progressed to some extent.

  For this reason, in order to extend the life of the blast furnace 100, it is necessary to prevent a void from being formed in the joint between the bricks adjacent to each other in the brick layer 150. When such voids are formed, hot metal is inserted from the joints during operation of the blast furnace 100, and there is a risk that the furnace life will be significantly reduced.

Further, in order to extend the life of the blast furnace 100, it is necessary to cool the brick layer 150 with high efficiency in the cooling layer 130 via the stamp material layer 140, and to reduce the melting rate of the brick layer 150 as much as possible. is there.
In order to efficiently cool the brick layer 150, it is necessary to prevent a gap from being formed between the bricks. Further, it is necessary to prevent a gap from being formed between the brick layer 150 and the stamp material layer 140 or between the stamp material layer 140 and the cooling layer 130. When such voids are formed, the brick layer 150 cannot be cooled appropriately, and the melting damage of the brick layer 150 proceeds remarkably, leading to a decrease in the furnace life.

After the blast furnace 100 reaches the end of its life, the operation of the blast furnace 100 is stopped, and the entire blast furnace 100 is repaired with replacement of the stamp material layer 140 and the brick layer 150.
Conventionally, as a method of repairing such a blast furnace, the furnace body of the blast furnace 100 is disassembled into a plurality of blocks and sequentially transported from the blast furnace foundation, and a plurality of blocks manufactured in advance at locations other than the blast furnace foundation are placed on the blast furnace foundation What repairs a blast furnace furnace body by accumulating sequentially is known (for example, refer patent documents 1-3).

  In the configuration described in Patent Document 1, the portion constituting the furnace body shaft portion of the blast furnace is divided into a plurality of ring-shaped blocks in advance, and the iron skin, the cooling stave, the refractory, and the like are integrated into other parts of the construction site. Assembled in place. In the construction work of the blast furnace, the block constituting the lowermost stage of the furnace shaft supported by the furnace body is transported by the transport device, and further installed in the furnace body by the lifting tool, hydraulic jack and laterally moving carriage. . Thereafter, the next block is transported in the same manner and connected to the top of the previously installed block. This process is repeated until the uppermost block of the furnace body shaft portion is sequentially assembled. During this time, a method is employed in which bricks are stacked at the bottom of the furnace using a crane.

  In the configuration described in Patent Document 2, a method is used in which a blast furnace is repaired and constructed using a lift-up method, and each ring-shaped block is conveyed using a cast floor. In this method, the mounting of each ring-shaped block on the cast floor is carried out on a frame extending outside the cast floor building, and on a slide rail provided on the frame, and movable to move outside the cast bed building. Up and down movement is possible with a sliding device that has a hydraulic cylinder that can move intermittently on a slide rail, and a pair of rod-type lifting jacks installed on this moving frame, which controls the horizontal movement of this moving frame. In addition, this is performed by using an overhead device having a suspension base provided with a ring-shaped block suspension. With such a configuration, it is possible to prevent warping or distortion of the brick stack in the ring-shaped block during conveyance, lifting, and joining.

  In the configuration described in Patent Document 3, the blast furnace is divided into several blocks from the top of the furnace to the bottom of the furnace, and is constructed at a place other than the foundation of the blast furnace, and is used for blast furnace construction provided on a furnace body support column. A method has been adopted in which each divided block is sequentially assembled from the top of the furnace by a so-called lift-up method using an attached rod, and finally the bottom of the furnace is fixed together with the bottom of the furnace bottom on the foundation of the blast furnace.

JP 2000-144220 A JP 2000-319709 A Japanese Patent Publication No. 53-39322

Here, each of the configurations described in Patent Documents 1 to 3 includes a step of manufacturing a plurality of blocks in advance in a place other than the blast furnace foundation and moving these blocks to the blast furnace foundation. Yes. In this case, the most concern is that during the movement of the block, voids are formed at the joints between adjacent bricks in the brick layer, at the interface between the brick layer and the stamp material layer, and at the interface between the stamp material layer and the cooling layer. For example, defects that lead to a reduction in furnace life occur.
Therefore, it is necessary to inspect whether or not the defect has occurred between the time when the block is transported and the time when the block is installed on the blast furnace foundation.

However, the above Patent Documents 1 to 3 do not show specific measures for preventing and detecting the occurrence of the defect.
For this reason, in the conventional configurations as described in Patent Documents 1 to 3, inspection for the presence or absence of defects after the movement of the block has to be performed by appearance observation from the inside of the furnace. Here, during the movement of the block, the brick joint tends to be deformed into a state in which the inside of the furnace contracts and the outside of the furnace opens. For this reason, after installation on the blast furnace foundation of the block, even if no void is formed inside the joint furnace, if joints are formed outside the joint furnace, It was impossible to confirm the defect. Moreover, it was impossible to confirm the defect of the stamp material layer provided on the back surface of the brick layer in the appearance observation from the inside of the furnace.

  In view of the above-described problems, the present invention suitably detects a defect generated in a block before installing a plurality of blocks of a blast furnace body previously manufactured in a place other than the blast furnace foundation on the blast furnace foundation. An object of the present invention is to provide a defect inspection method for a block of a blast furnace body that can be performed, and a defect repair method thereof.

  According to the first aspect of the present invention, a plurality of blocks each having a brick layer and a stamp material layer, each of which includes a plurality of bricks, are manufactured in a place other than the blast furnace foundation, and the plurality of blocks are formed in the blast furnace foundation. A method for inspecting whether or not a defect has occurred in the block when building or repairing a blast furnace body by stacking on the block, the block being moved from a place other than the blast furnace foundation onto the blast furnace foundation Until the thickness of the joint between the bricks in the brick layer, the strain generated in the brick, and the thickness of the stamp material layer are sequentially measured, and the brick layer and the stamp material layer in the block are measured. A defect inspection method for a block of a blast furnace body characterized by inspecting whether or not a defect has occurred.

  According to a second aspect of the present invention, in the defect inspection method for a block of a blast furnace furnace body according to the first aspect, the block is manufactured in advance at a place other than the blast furnace foundation, and then adjacent to the brick layer of the block. A displacement gauge is installed inside the furnace between the pair of bricks, a strain gauge is installed inside the furnace of each pair of bricks, and the block is moved from a place other than the blast furnace foundation to the blast furnace foundation. The thickness of the inside of the furnace at the joint between the pair of bricks is sequentially measured with the displacement meter, and the respective strains generated inside the furnace of the pair of bricks are sequentially measured with the strain gauge, and the block After the installation on the blast furnace foundation, based on the thickness change of the joint and the change of the strain, it is inspected whether a void is formed outside the furnace in the joint between the pair of bricks When That is a defect inspection method of a block of blast furnace body.

  According to a third aspect of the present invention, in the defect inspection method for a block of a blast furnace body according to the first or second aspect, after the block is manufactured in a place other than the blast furnace base in advance, the stamp material Displacement gauges are installed for each of the furnace inner side and the furnace outer side of the layer, and the stamp material layer is moved by the displacement gauge during the period from when the block is moved from a place other than the blast furnace foundation onto the blast furnace foundation. Sequentially measuring the thickness of the block, and after installing the block on the blast furnace foundation, inspecting whether or not a void is formed in the stamp material layer based on a change in the thickness of the stamp material layer. It is a defect inspection method for a block of a blast furnace furnace.

  According to a fourth aspect of the present invention, in the defect inspection method for a block of a blast furnace furnace body according to any one of the first to third aspects, the block is a furnace bottom constituting a hearth part of the blast furnace furnace body. The furnace bottom mantel is a base, a substantially cylindrical iron skin standing on the base, and a cooling layer provided in a state of covering the base and the inside of the furnace of the iron skin, A stamp material layer laminated on the cooling layer, and a brick layer laminated on the stamp material layer, and the brick layer includes a plurality of furnace bricks constituting a disc-shaped furnace bottom surface, A plurality of vertically long vertical bricks stacked on the furnace brick, and a plurality of ring bricks stacked on the furnace brick and surrounding an outer peripheral side of the vertical brick, After installation of the mantel on the blast furnace foundation, a pair of the adjoining each other A gap generated on the outside of the furnace at the joint between the stacked bricks, a gap generated at the joint between the pair of adjacent ring bricks, and a gap generated at the interface between the adjacent vertical bricks and the furnace brick A gap generated at an interface between the ring brick and the stamp material layer opposed to the ring brick, a gap generated at an interface between the stamp material layer and the cooling layer opposed to the ring brick, the furnace brick, and the same At least one of a void generated at an interface between the stamp material layer and the stamp material layer and a void generated at an interface between the stamp material layer and the cooling layer covering the base. A defect inspection method for a block of a blast furnace furnace body, characterized by inspecting the presence or absence of occurrence.

  Invention of Claim 5 is the method of repairing the said defect, when the said defect is detected in the defect inspection method of the block of the blast furnace furnace body in any one of Claim 1 thru | or 4. When the gap as the defect is formed in the joint between the bricks, after the block is installed on the blast furnace foundation, the joint where the void is generated is opened, and mortar is put in the hole. It is a defect repairing method for a block of a blast furnace furnace body, which is filled and closed by pushing a cylindrical plug made of the same material as the brick into the hole.

  A sixth aspect of the present invention is the blast furnace furnace block defect repairing method according to the fifth aspect, wherein the hole and the plug have a diameter of 20 to 50 mm. This is a block defect repair method.

The invention according to claim 7 is the defect repair method for a block of a blast furnace furnace body according to claim 5 or claim 6, wherein the depth L of the hole is set to the depth L and the joint in the brick. The area S of the facing surface, the average thickness t of the voids formed in the joint, and the diameter d of the hole portion are 0.7 ≦ (π · d ² · L / 4) / (S T) is a defect repair method for a block of a blast furnace body, which is set under a condition that satisfies the relationship of 1.0.

  The invention according to claim 8 is a method for repairing the defect when the defect is detected by the defect inspection method for a block of a blast furnace furnace body according to claim 4, wherein the defect is applied to the furnace bottom mantel. Is provided with an opening penetrating the iron skin and the cooling layer, and when the void as the defect is formed at the interface inside the furnace or outside the furnace in the stamp material layer, the mantle of the furnace bottom mantel After the installation on the blast furnace foundation, the gap is closed by press-fitting a filler having a thermal conductivity of 10 Wm / K or more into the stamp material layer from the opening, and repairing a defect in the block of the blast furnace body Is the method.

  According to the present invention, after a plurality of blocks constituting the blast furnace furnace body are installed on the blast furnace foundation, voids formed on the outside of the brick joint furnace, which cannot be detected by appearance observation from the inside of the furnace, or the brick layer It is possible to satisfactorily detect defects such as voids formed at the interface between the stamp material layer and voids formed at the interface between the stamp material layer and the cooling layer. As a result, it becomes possible to detect the gaps that cause a decrease in the life of the furnace and appropriately repair them, so that hot metal can be prevented from being inserted into the joints between the bricks, and the brick layer The melting rate can be reduced. Therefore, it is possible to further increase the life while enabling rapid construction and repair of the blast furnace.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, illustrating a repair method for the blast furnace 100 shown in FIG. FIG. 2 is a schematic diagram showing the overall configuration of the blast furnace.

(1) Blast Furnace Repair Method In FIG. 2, the furnace body of the blast furnace 100 is configured such that a bottom mantel 100 </ b> A and a plurality of ring-shaped blocks 100 </ b> B to 100 </ b> E constituting the hearth part of the blast furnace 100 are stacked on the blast furnace base 200 in order. Constructed by joining together. On the blast furnace foundation 200, a furnace body 300 including a hydraulic jack 310 that hangs and raises each of the bottom mantel 100A and the plurality of ring-shaped blocks 100B to 100E is erected.

  Such a repair method for the blast furnace 100 includes a dismantling process for disassembling the furnace body of the blast furnace 100, a block manufacturing process for manufacturing the furnace bottom mantel 100A and a plurality of ring-shaped blocks 100B to 100E in advance, and a furnace bottom mantel 100A. And a construction step of reconstructing the furnace body of the blast furnace 100 by transporting the plurality of ring-shaped blocks 100B to 100E to the blast furnace foundation 200 and stacking them on the blast furnace foundation 200.

Specifically, in the dismantling process, the bottom mantel 100A and the ring-shaped block 100B joined to each other are divided, and the ring-shaped blocks 100B to 100E are lifted by the hydraulic jack 310. During this time, the bottom mantel 100A is placed on the dolly 400 (see FIG. 2) and carried out from the blast furnace base 200 to the outside. Then, the ring-shaped blocks 100B to 100E are lowered onto the blast furnace base 200 by the hydraulic jack 310.
Similarly, the ring-shaped blocks 100B and 100C joined to each other are divided, and the ring-shaped block 100B is carried out from the blast furnace base 200 to the outside. Similarly, the ring blocks 100C to 100E are carried out from the blast furnace base 200 to the outside. This completes the dismantling process.

Next, the block manufacturing process will be described with reference to the drawings. FIG. 3 is a side view schematically showing a furnace bottom mantel in a first state and a dolly that conveys the furnace bottom mantel. FIG. 4 schematically shows the brick structure of the bottom mantle in the first state, (A) is a plan view, and (B) is a cross-section along the line AA in (A). It is the arrow view which shows, and the arrow view which shows the cross section which follows a BB line. FIG. 5 is a side view schematically showing the furnace bottom mantel in the second state and the dolly that conveys the furnace bottom mantel.
In the present embodiment, the configuration in which the defect inspection / repair is performed only on the bottom mantel 100A is illustrated, but the present invention is not limited to this, and the defect is similarly detected on the plurality of ring-shaped blocks 100B to 100E. Inspection and repair may be performed.

The block manufacturing process is a preparatory process for the construction process, and a new furnace bottom mantel 100A and a plurality of ring-shaped blocks 100B to 100E are manufactured in advance at a place other than the blast furnace base 200.
For example, when manufacturing the bottom mantel 100A, for example, the first state as shown in FIG. 3 or the second state as shown in FIG. 5 is set.
It should be noted that the brick loading state needs to be appropriately changed according to the capabilities of the hydraulic jack 310 and the dolly 400 and the weight of the furnace bottom mantel 100A. Here, in the present embodiment, the two types of furnace bottom mantels 100A in the first or second state are illustrated, but the present invention is not limited thereto, and the brick loading state may be changed as appropriate according to the above conditions.

The furnace bottom mantel 100A in the first state shown in FIG. 3 has a base 110, an iron skin 120, a cooling layer 130, a stamp material layer 140, a brick layer 150, a feather layer, as in the configuration shown in FIG. A mouth 170 and a spout mouth 180 are provided.
In the furnace bottom mantel 100A in the first state, as shown in FIG. 4, the brick layer 150 includes a plurality of furnace bricks 151 stacked on the bottom of the stamp material layer 140, and the furnace bricks 151 on the furnace brick 151A. A plurality of vertically long vertical bricks 152 forming a substantially hexagonal columnar layer (see FIG. 4A) stacked on the outer periphery of the vertical brick 151 and stacked on the outer peripheral edge of the furnace brick 151 And a plurality of ring bricks 154 surrounding. The ring brick 154 is laminated to a height equal to the top of the vertical brick 152 (see FIG. 4B), and the stamp material layer 140 is also formed to a height equal to the top of the vertical brick 152 (see FIG. 4). 3).

After manufacturing the furnace bottom mantel 100A in such a first state, a displacement meter capable of measuring the joint thickness between the bricks, a strain gauge capable of measuring the strain generated in each brick, and the stamp material layer 140 And a displacement meter capable of measuring the thickness of the. Specific locations, types, and arrangements where these displacement gauges and strain gauges are installed will be described later.
In the construction process of the next process, these displacement gauges and strain gauges are removed after the furnace bottom mantel 100A in the first state is installed on the blast furnace foundation 200. Then, the buried brick 153, the morning glory brick 155, the ring brick 154, and the remaining part of the stamp material layer 140 are carried into the furnace bottom mantel 100A and constructed.

As with the configuration shown in FIG. 1, the bottom mantel 100A in the second state shown in FIG. 5 has a base 110, an iron skin 120, a cooling layer 130, a stamp material layer 140, a brick layer 150, a feather layer. A mouth 170 and a spout mouth 180 are provided.
In the furnace bottom mantel 100A in the second state, the brick layer 150 includes a plurality of furnace bricks 151 stacked on the bottom of the stamp material layer 140, and a substantially hexagonal layer stacked on the furnace brick 151. A plurality of vertically long vertical bricks 152 forming a columnar layer (see FIG. 4A), a plurality of middle bricks 153 stacked on the vertical bricks 152, and the outside of the furnace brick 151 A plurality of ring bricks 154 stacked on the periphery and surrounding the outer peripheral sides of the vertical bricks 152 and the intermediate bricks 153 are provided. The ring brick 154 is laminated up to a middle position between the tuyere 170 and the taphole 180, and the stamp material layer 140 is also formed to a height equal to this.

After constructing the furnace bottom mantel 100A in such a second state, a displacement meter capable of measuring the joint thickness between the bricks, a strain gauge capable of measuring the strain generated in each brick, and the stamp material layer 140 And a displacement meter capable of measuring the thickness of the. The location, type and arrangement of these displacement gauges and strain gauges will be described later.
Note that these displacement gauges and strain gauges are removed after the furnace bottom mantel 100A in the second state is installed on the blast furnace base 200 in the construction process of the next process. And the morning glory brick 155 and the remaining part of the ring brick 154 and the stamp material layer 140 are carried into the inside of the furnace bottom mantel 100A and constructed.

Next, the construction process will be described with reference to FIG.
In the construction process, the ring-shaped block 100E corresponding to the top of the furnace manufactured in the block manufacturing process is placed on the dolly 400 and conveyed from the manufacturing site to the side of the blast furnace base 200. Then, the ring-shaped block 100E is slid on the blast furnace base 200 and held sideways to the center of the furnace body rod 300. Further, the ring-shaped block 100E is lifted by the hydraulic jack 310 to a height at which the next-stage ring-shaped block 100D enters the lower part.
The ring-shaped block 100D manufactured in the block manufacturing process by the same means is conveyed to the center part of the furnace body 300, and the ring-shaped blocks 100D and 100E are joined to each other at that position. Then, the joined ring-shaped blocks 100D and 100E are lifted by the hydraulic jack 310 to a height at which the ring-shaped block 100C enters the lower part. Further, the same operation is performed on the ring-shaped blocks 100C and 100B to obtain the state shown in FIG.

  Then, the furnace bottom mantel 100A manufactured in the block manufacturing process is placed on the frame 410 provided on the dolly 400 (see FIGS. 3 and 5) and conveyed to the side of the blast furnace base 200. . Thereafter, the ring-shaped blocks 100B to 100E are lifted by the hydraulic jack 310 to a height at which the bottom mantel 100A enters the lower part. From this state, the furnace bottom mantel 100A is horizontally held and installed on the blast furnace foundation 200, and joined to the ring-shaped block 100B.

After the installation of the furnace bottom mantel 100A, the stamp material layer 140 and the brick layer 150 in the furnace bottom mantel 100A are inspected. If a defect is found in a predetermined part after inspection, the defect is repaired. An inspection method for the stamp material layer 140 and the brick layer 150 and a defect repair method will be described later.
Thereafter, the displacement gauges and strain gauges installed in each part of the furnace bottom mantel 100A are removed, and the remaining portions of the stamp material layer 140 and the brick layer 150 are constructed. Thus, the construction of the blast furnace 100 is completed.

(2) Defect Inspection Method for Stamp Material Layer and Brick Layer Next, an inspection method for each defect of the stamp material layer 140 and the brick layer 150 in the furnace bottom mantel 100A will be described based on the drawings. FIG. 6 is a plan view schematically showing an installation point of the displacement meter with respect to the furnace bottom mantel.

Each defect in the stamp material layer 140 and the brick layer 150 is first inspected after the furnace bottom mantel 100A in the first or second state is manufactured in the block manufacturing process described above (see FIGS. 3 and 5). A displacement meter and a strain gauge are installed at the positions shown in FIG.
Next, in the above-described construction process, the furnace bottom mantel 100A is transported from the production site to the blast furnace foundation 200 and constructed on the blast furnace foundation 200, and various displacement meters and strain gauges are used to place predetermined bricks. The thickness of the joint, the distortion generated in the predetermined brick, and the thickness of the predetermined portion in the stamp material layer are sequentially measured.
After the furnace bottom mantel 100A is installed on the blast furnace base 200, it is inspected whether or not a defect has occurred in the stamp material layer 140 and the brick layer 150 on the basis of various information acquired by various displacement meters and strain gauges. To do.

(2-1) Displacement meter and strain gauge installation point for the bottom mantle in the first state Specifically, the installation point of the displacement meter and strain gauge for the bottom mantel 100A in the first state (see FIG. 3) This will be described with reference to FIG.

A clip-type displacement meter 1 that is a displacement meter for measuring the amount of joint displacement between a pair of vertically stacked bricks 152 adjacent to each other in the horizontal direction is provided on the vertical bricks 152 corresponding to A to M in FIG. It is attached (see FIG. 8 described later). Moreover, the strain gauge 2 is attached to each upper surface of the pair of vertical bricks 152 (see FIG. 8 described later).
Displacement meters 3 for measuring the amount of relative displacement in the vertical direction between a pair of vertically stacked bricks 152 adjacent to each other in the horizontal direction are mounted on the vertical bricks 152 corresponding to A to M in FIG. (See FIG. 9).

In FIG. 6, the uppermost ring brick 154 corresponding to P and Q and the cooling layer 130 facing the ring brick 154 are changed in thickness of the stamp material layer 140 sandwiched between the ring brick 154 and the cooling layer 130. A displacement meter 4 to be measured is attached (see FIG. 10 described later).
In FIG. 6, the thickness of the stamp material layer 140 sandwiched between the ring brick 154 and the cooling layer 130 is disposed inside the uppermost ring brick 154 corresponding to P and Q and the cooling layer 130 facing the ring brick 154. A displacement meter 5 for measuring the change is embedded (see FIG. 11 described later).
A displacement meter 6 (see FIG. 12 described later) for measuring the thickness change of the stamp material layer 140 is embedded in the furnace brick 151 and the stamp material layer 140 corresponding to N and O in FIG. .

(2-2) Displacement meter and strain gauge installation points for the second bottom furnace mantel Figure 2 shows displacement point and strain gauge installation points for the second bottom furnace mantel 100A (see FIG. 5). This will be described in 6 and 7. Here, FIG. 7 is a schematic diagram for explaining a method of inspecting the gap between the bricks in the furnace bottom mantel in the second state.

A clip-type displacement meter 1 that measures the amount of joint displacement between a pair of middle bricks 153 that are adjacent to each other in the horizontal direction is mounted on the middle bricks 153 corresponding to A to M in FIG. 8). And the strain gauge 2 is attached to each upper surface of the said pair of middle brick 153 (refer FIG. 7, 8).
Displacement meters 3 for measuring the amount of relative displacement in the vertical direction between a pair of middle bricks 153 that are adjacent to each other in the horizontal direction are mounted on the middle bricks 153 corresponding to A to M in FIG. 9).

A clip-type displacement meter 1 that measures the amount of joint displacement between a pair of ring bricks 154 adjacent to each other in the vertical direction is attached to the ring bricks 154 corresponding to P and Q in FIG. 6 (see FIGS. 7 and 8). .
Displacement meters 3 for measuring the amount of relative displacement in the vertical direction with vertical bricks 152 or ring bricks 154 adjacent to each other in the vertical direction are attached to ring bricks 154 corresponding to P and Q in FIG. 6 (FIG. 7). , 9).

The displacement meter 4 described above is attached to the ring brick 154 corresponding to P and Q in FIG. 6 and the cooling layer 130 facing the ring brick 154 (see FIG. 10 described later).
In the ring brick 154 corresponding to P and Q in FIG. 6 and the cooling layer 130 facing the ring brick 154, the displacement meter 5 described above is embedded (see FIG. 11 described later).
In the furnace brick 151 and the stamp material layer 140 corresponding to N and O in FIG. 6, the displacement meter 6 (see FIG. 12 described later) is embedded.

(2-3) Various Displacement Meters and Strain Gauges Next, the various displacement meters and strain gauges described above will be described with reference to the drawings.

  The clip type displacement meter 1 and the strain gauge 2 will be described with reference to FIG. Here, FIG. 8 is a schematic diagram showing a displacement meter and a strain gauge for measuring the displacement in the thickness direction of adjacent joints between bricks. A conventional clip type displacement meter and strain gauge can be applied to the clip type displacement meter 1 and the strain gauge 2, respectively.

  The clip-type displacement meter 1 is attached to each upper surface of a pair of vertically stacked bricks 152 adjacent to each other in the furnace bottom mantel 100A (see FIG. 3) in the first state. Thereby, the displacement amount of the upper side (furnace inside) in the joint between the pair of vertical bricks 152 can be measured. In addition, the strain gauge 2 provided on the upper surface of the pair of vertical bricks 152 measures the strain generated in the pair of vertical bricks 152, and calculates the total deformation amount of the vertical bricks 152 alone. Then, based on the displacement amount of the joint from the clip-type displacement meter 1 and the total deformation amount of the vertical brick 152 obtained from the strain from the strain gauge 2, the thickness change on the joint surface side is calculated.

Usually, the joint between a pair of adjacent vertical bricks 152 has a property that when the joint ground side contracts around the vertical center of the vertical brick 152, the joint base side expands. The amount of change is about the same between the ground side and the lower side.
For this reason, the thickness change on the underground side (furnace outer side) between the vertical bricks 152 is calculated from the thickness change on the ground side calculated from the information from the clip-type displacement meter 1 and the strain gauge 2. It becomes possible. Therefore, it is possible to inspect whether or not a gap is formed on the basement side between the vertical bricks 152.

More specifically, for example, the joint thickness between a pair of adjacent vertical bricks 152 is 0.5 mm. For this reason, only the clip-type displacement meter 1 cannot detect a joint thickness change of 0.5 mm or more. Therefore, the strain of the pair of vertical bricks 152 is measured with the strain gauge 2, and the total deformation amount of the single vertical brick 152 is calculated from the strain. Then, the joint thickness change from the clip-type displacement meter 1 and the total deformation amount of each vertical brick 152 from the strain gauge 2 are added, and the joint underground side (outer side of the furnace) between the vertical bricks 152 is added. Estimate the change in thickness.
Here, the mortar constituting the gap between the brick joints can follow a displacement of ± 0.1 mm. And after operation of the blast furnace 100, the hearth 160 is exposed to 2000 degreeC or more, and, thereby, the said brick joint expands about 1 mm.
Therefore, in the above construction process, there is a time when the value obtained by adding the joint thickness change from the clip-type displacement meter 1 and the total deformation amount of each vertical brick 152 from the strain gauge 2 exceeds 1.1 mm. When it exists, it is judged that the space | gap which reduces the lifetime of the blast furnace 100 was formed.

  In the case of the furnace bottom mantel 100A in the second state, the clip-type displacement meter 1 is attached to each upper surface of a pair of adjacent buried bricks 153 in a bridged state. As a result, from the change in the thickness above the joint (inside the furnace) between the pair of middle buried bricks 153 calculated from the information from the clip-type displacement meter 1 and the strain gauge 2, the joint underground between the middle buried bricks 153 is obtained. It is possible to calculate the thickness change on the side (outside of the furnace). Therefore, it is possible to inspect whether or not a void is formed on the side of the joint between the buried bricks 153.

  Further, as described above, the clip-type displacement meter 1 is attached in a bridging state on each furnace inner side surface of the pair of ring bricks 154 adjacent to each other in the vertical direction in the furnace bottom mantel 100A in the second state. It is done. Thereby, it is possible to inspect whether or not a gap is formed in the joint from the change in thickness of the joint between the pair of ring bricks 154 measured from the clip type displacement meter 1.

  The displacement meter 3 will be described with reference to FIG. Here, FIG. 9 is a schematic diagram showing a displacement meter that measures the displacement in the shearing direction of the joints between adjacent bricks. Note that the displacement meter 3 can be a conventional displacement meter such as a one-dimensional measuring device.

  The displacement meter 3 has a base end of the displacement meter 3 fixed to the upper surface of one of a pair of adjacent vertical bricks 152 in the bottom mantel 100A (see FIG. 3) in the first state, The tip of the displacement meter 3 is in contact with the upper surface of the other brick. Thereby, since the displacement in the vertical direction of any one of the pair of vertical bricks 152 can be measured, the vertical brick 152 and the furnace brick 151 adjacent to the lower side are based on the displacement. It is possible to inspect whether or not a gap is generated at the interface between the two.

  In the case of the furnace bottom mantel 100A (see FIG. 5) in the second state, the displacement meter 3 is arranged on the upper surface of one of the pair of adjacent buried bricks 153 in the same manner as shown in FIG. The base end portion of the displacement meter 3 is fixed, and the distal end of the displacement meter 3 is in contact with the upper surface of the other brick. Thereby, since the displacement in the vertical direction of any one of the pair of middle buried bricks 153 can be measured, the middle buried brick 153 and the middle buried brick 153 adjacent to the lower side are based on the displacement. It is possible to inspect whether or not a gap is generated at the interface between the two.

In addition, as shown in FIG. 7, the displacement meter 3 includes, in the furnace bottom mantel 100A in the second state, the ring bricks 154 adjacent to each other in the vertical direction and the vertical bricks 152 adjacent to each other in the vertical direction. The amount of relative displacement in the vertical direction with respect to the ring brick 154 is measured.
That is, as indicated by the phantom lines in FIG. 7, the buried bricks 153 corresponding to P and Q in FIG. 6 are removed, and are displaced to the upper surface of the third-stage ring brick 154 from the bottom in the figure. The base end portion of the total 3 is fixed, and the distal end of the displacement meter 3 is in contact with the upper surface of the vertical brick 152 on the outer peripheral side. This displacement meter 3 makes it possible to measure the amount of relative displacement between the vertical brick 152 and the ring brick 154 in the vertical direction.
Further, the base end portion of the displacement meter 3 is fixed to the upper surface of the ring brick 154 in the fourth step from the bottom in the drawing, and the tip of the displacement meter 3 is brought into contact with the upper surface of the ring brick 154 in the third step from the bottom in the drawing. ing. This displacement meter 3 makes it possible to measure the amount of relative displacement in the vertical direction between the ring bricks 154 adjacent to each other in the vertical direction.
Therefore, it is possible to inspect the occurrence of gaps between the ring bricks 154 adjacent to each other in the vertical direction and between the vertical bricks 152 and the ring bricks 154.

  The displacement meter 4 will be described with reference to FIG. Here, FIG. 10 is a side sectional view schematically showing a displacement meter for measuring the displacement in the thickness direction of the side surface portion of the stamp material layer. Note that a displacement meter such as a conventional one-dimensional measuring device can be applied to the displacement meter 4.

  The base end portion of the displacement meter 4 is fixed to the upper surface of the uppermost ring brick 154, and the distal end portion of the displacement meter 4 is brought into contact with the exposed inside of the furnace of the cooling layer 130. Thereby, the displacement meter 4 can detect a change in the thickness of the stamp material layer 140 sandwiched between the ring brick 154 and the cooling layer 130. If the change in the thickness of the stamp material layer 140 exceeds an allowable value, it is determined that a void has occurred at the interface between the stamp material layer 140 and the ring brick 154 or the interface between the stamp material layer 140 and the cooling layer 130. To do.

For example, the stamp material layer 140 can be expanded by itself up to a thickness of 1 mm, and can be restored by contraction after expansion. In addition, the operation of the blast furnace 100 causes each brick in the brick layer 150 to thermally expand, thereby causing a 1 mm contraction on the stamp material layer 140.
Therefore, in the construction process described above, when there is a point in time when the thickness change of the stamp material layer 140 measured by the displacement meter 4 exceeds 2 mm, the interface between the stamp material layer 140 and the ring brick 154 or the stamp material layer It is determined that a gap that reduces the life of the blast furnace 100 is formed at the interface between the cooling layer 130 and the cooling layer 130.

  The displacement meter 5 will be described with reference to FIG. Here, FIG. 11 is a side cross-sectional view schematically showing a displacement meter that measures the displacement in the thickness direction of the side portion of the stamp material layer and the opening. In FIG. 11, the displacement meter 5 is provided in the vicinity of the bottom portion on the side of the furnace body of the blast furnace 100 and includes a pair of displacement meters 51 and 52.

The displacement meter 51 is provided so as to penetrate the side surfaces of the iron skin 120, the cooling layer 130, and the stamp material layer 140. And the front-end | tip of the displacement meter 51 is contact | abutted in the opposing surface (furnace inner side in the stamp material layer 140) with the stamp material layer 140 in the ring brick 154 of the 2nd step from the bottom. With this displacement meter 51, it is possible to detect the displacement of the furnace inner end surface in the stamp material layer 140.
The displacement meter 52 is provided in the vicinity of the displacement meter 51 so as to penetrate the side surfaces of the iron shell 120 and the cooling layer 130. The distal end of the displacement meter 52 is in contact with the surface of the cooling layer 130 facing the stamp material layer 140 (outer side of the furnace in the stamp material layer 140). With this displacement meter 52, the displacement of the outer end face of the furnace in the stamp material layer 140 can be detected.

Then, the thickness change of the stamp material layer 140 is determined by the difference between the displacement of the furnace inner end surface in the stamp material layer 140 detected from the displacement meter 51 and the displacement of the furnace outer end surface in the stamp material layer 140 detected from the displacement meter 52. Calculate. Similarly to the displacement meter 4, when the thickness change of the stamp material layer 140 exceeds an allowable value, the interface between the stamp material layer 140 and the ring brick 154 or the interface between the stamp material layer 140 and the cooling layer 130. It is determined that voids have occurred.
In addition, although this displacement meter 5 is removed in principle after completion of the repair work of the blast furnace 100, it may remain attached after the repair work of the blast furnace 100 is finished. In this case, since the sealing process is performed, the operation of the blast furnace 100 is not adversely affected.

  The displacement meter 6 will be described with reference to FIG. Here, FIG. 12 is a side sectional view schematically showing a displacement meter for measuring the displacement of the bottom surface portion of the stamp material layer in the thickness direction. This displacement meter 6 is provided inside the furnace brick 151 and inside the stamp material layer 140. The displacement meter 6 includes an embedded displacement sensor 61.

The base end side of the displacement sensor 61 is embedded in the furnace brick 151, and the cable 62 connected to the sensor base end side extends from the inside of the furnace brick 151 to the outside of the furnace body of the blast furnace 100. It is drawn out of the furnace body through the provided pipe 151A.
The pipe 151A includes a temperature sensor 151B for measuring the temperature of the furnace brick 151, and is provided in advance for drawing a cable connected to the temperature sensor 151B to the outside of the furnace. It is.
The distal end side of the displacement sensor 61 is in contact with the upper end surface of the top 63. The frame 63 is a substantially columnar raising member, and is installed on the upper surface of the cooling layer 130 on the bottom surface side inside the bottom surface portion of the stamp material layer 140.

With such a displacement meter 6, it is possible to measure a change in thickness of the bottom surface portion of the stamp material layer 140. Therefore, the interface between the furnace brick 151 provided with the displacement meter 6 and the stamp material layer 140 facing this, or the cooling layer 130 covering the stamp material layer 140 near the displacement meter 6 and the base 110 facing this. It is possible to inspect whether or not a void is generated at the interface.
Although the displacement meter 6 remains attached even after the repair work of the blast furnace 100 is completed, the outer periphery of the pipe 151A is sealed and the displacement meter 6 is not exposed to the furnace. Therefore, there is no adverse effect when the blast furnace 100 is operated.

(3) Repair of defects generated in the brick layer and the stamp material layer Next, in the above-described construction process, it is formed between the bricks in the brick layer 150 or at the interface between the furnace inner side and the furnace outer side of the side portion of the stamp material layer 140. A method for repairing the gap when the gap is detected will be described.

  First, a method for repairing gaps formed between bricks in the brick layer 150 will be described with reference to FIG. Here, FIG. 13 is a schematic diagram for explaining a method for repairing a gap when a gap is formed in the joint between adjacent bricks. FIG. 13A is a diagram in which a gap is formed in the joint between bricks. (B) shows a state where a hole is formed in the joint, (C) shows a state where the hole is filled with mortar, and (D) shows a state where a plug is pushed into the hole. .

After the installation of the bottom mantel 100A on the blast furnace foundation 200, it is assumed that the gap A is formed in the joint shown in FIG. 13A at the joint between a pair of adjacent vertical bricks 152. In this case, the joint portion where the gap A is generated is opened to form a cylindrical hole portion B, and the state shown in FIG.
Although FIG. 13 illustrates the configuration in which the hole B is formed from the opening side of the gap A, the hole B may be formed from the side opposite to the opening side of the gap A.

  Then, using the mortar injection means C, the hole B is filled with mortar D to obtain the state shown in FIG. Then, a plurality of cylindrical stoppers F made of the same material as the vertical brick 152 are pushed into the hole B using a hammer E or the like. Thereby, the mortar D spreads to every corner of the hole B, and the gap A is completely closed. In particular, by using a plurality of stoppers F shorter than the length of the hole B, the gap A can be more suitably closed.

  Here, it is preferable that the diameter of the hole B and the plug F is 20 to 50 mm. Thus, the mortar D can be satisfactorily filled into the hole B by setting the diameter of the hole B to 20 to 50 mm. Further, by matching the diameter of the plug F with the diameter of the hole B and pushing the plug F into the hole B a plurality of times, the mortar D is spread to every corner of the hole B, and the gap A is more completely formed. It becomes possible to occlude. If the diameter of the hole B is smaller than 20 mm, the mortar D cannot be filled to every corner of the hole B, and if the diameter of the hole B is larger than 50 mm, the plug F is inserted. Therefore, a large force is required and time is required for opening. In other words, in order to insert the plug F into the hole B manually and to secure the filling amount of the mortar D necessary to close the gap A, the diameter of the hole B and the plug F is set to about 20 to 50 mm. Is reasonable.

In addition, the depth L of the hole B is defined by the depth L, the area S of the surface facing the joint in the vertical brick 152, the average thickness t of the gap A formed in the joint, The diameter d is preferably set under the condition satisfying the relationship of 0.7 ≦ (π · d ² · L / 4) / (S · t) ≦ 1.0. That is, it is preferable to adjust the depth L of the hole B so that the ratio of the volume of the hole B to the volume of the gap A is in the range of 0.7 to 1.0. By doing in this way, the filling amount of the mortar D can be made suitable, and it becomes possible to block | close the space | gap A suitably. If the depth L of the hole B is set under the condition that the ratio of the volume of the hole B to the volume of the void A is smaller than 0.7, the mortar D necessary for completely closing the void A is obtained. The filling amount may not be ensured. Moreover, if the depth L of the hole B is set under the condition that the ratio of the volume of the hole B to the volume of the void A is larger than 1.0, it becomes difficult to insert the plug F, and a layer of only mortar D is formed. I can do it.

For example, when the diameter of the hole B is 40 mm and the length is 500 mm, the gap A can be suitably closed by using three plugs F having a diameter of 39 mm and a length of 100 mm. It has been confirmed.
In addition, for example, when the area of the surface facing the joint in the vertical brick 152 is 1200000 mm ² (height 600 mm × length 2000 mm), and the gap A having an average thickness of 2 mm is generated in the joint, the volume of the gap A is It becomes 2400000 mm ² . In this case, by forming the hole B (volume: 2400000 mm ² ) having a diameter dimension of 50 mm and a depth dimension of 1222 mm, and filling the mortar D with the plug F, the gap A could be suitably closed. Has been confirmed.

  With the above, the repair work for the gap formed in the joint between the vertical bricks 152 is completed. It should be noted that this gap repair method can repair the gap formed in the joint between the pair of adjacent bricks 153 adjacent to each other and the gap formed in the joint between the pair of ring bricks 154 adjacent to each other. .

  Next, a method for repairing voids formed at the interface between the side surface of the stamp material layer 140 on the furnace inner side and the furnace outer side will be described with reference to FIG.

After the installation of the bottom mantel 100A on the blast furnace base 200, a gap was formed at the interface between the side surface portion of the stamp material layer 140 and the ring brick 154 or at the interface between the side surface portion of the stamp material layer 140 and the cooling layer 130. To do. In this case, the stamp material layer 140 has a thermal conductivity of 10 Wm / K or more from an opening 190 (see FIG. 11) provided in advance in the furnace bottom mantel 100A and penetrating the side surface of the iron shell 120 and the cooling layer 130. Press-fit the filler.
The opening 190 is for press-fitting the filler, and the outer circumference of the furnace bottom mantel 100A is circumferentially arranged at intervals of 2 m in the height direction, for example, as shown in FIGS. About 10 to 20 are provided in the direction.
Further, as the filler, a paste obtained by kneading carbon powder and a phenol resin can be adopted, but is not limited thereto, and the heat conductivity is 10 Wm / K or more, and the heat resistance. Any material can be used as long as appropriate fluidity can be secured.

By pressing the filler into the stamp material layer 140 as described above, the stamp material layer 140 is impregnated with the filler. By this impregnated filler, the gap formed at the interface between the stamp material layer 140 and the ring brick 154 or at the interface between the stamp material layer 140 and the cooling layer 130 is closed.
At this time, since the filler used for repairing the gap has a thermal conductivity of 10 Wm / K or more, in the state after the repair, the brick layer 150 and the cooling layer 130 are excellent through the stamp material layer 140. Heat conduction is ensured.

(4) Effect of Embodiment According to the above-described embodiment, the following effect can be obtained.

(4-1) In the above construction process, the joint between the bricks in the brick layer 150 is moved until the bottom mantel 100A manufactured in the block manufacturing process is moved from a place other than the blast furnace base 200 onto the blast furnace base 200. The thickness, the strain generated in the brick, and the thickness of the stamp material layer 140 are sequentially measured. Based on this, it is inspected whether a defect has occurred in the brick layer 150 and the stamp material layer 140 in the furnace bottom mantel 100A.
For this reason, after the bottom mantel 100A constituting the furnace body of the blast furnace 100 is installed on the blast furnace base 200, a gap formed on the outside of the brick joint, which cannot be detected by appearance observation from the inside of the furnace, Defects such as voids formed at the interface between the layer 150 and the stamp material layer 140 and voids formed at the interface between the stamp material layer 140 and the cooling layer 130 can be detected well.
Further, even if the defect is a minute defect that does not cause a problem immediately after the furnace bottom mantel 100A is installed on the blast furnace foundation 200, the joint thickness is large at any point during the movement of the furnace bottom mantel 100A. When the change has occurred, the minute defect may grow into a defect that reduces the life of the furnace after the operation of the blast furnace 100. In this respect, in this embodiment, since the thickness of the joint between bricks is measured sequentially, the minute defect can be detected.
In this way, it is possible to detect the gaps that cause a decrease in the life of the furnace and appropriately repair them, so that hot metal can be prevented from being inserted into the joints between the bricks, and the bricks The melting rate of the layer 150 can be reduced.
Therefore, the life of the blast furnace 100 can be further increased while enabling rapid construction and repair.

(4-2) Regarding the defects generated in the brick layer 150, after the furnace bottom mantel 100A is manufactured in advance in a block manufacturing process at a place other than the blast furnace base 200, a pair of adjacent brick layers 150 of the furnace bottom mantel 100A are adjacent to each other. The clip-type displacement meter 1 is installed inside the furnace between the bricks. Moreover, the strain gauge 2 is installed inside each furnace of the pair of bricks. And in the construction process, while moving the bottom mantel 100A from the place other than the blast furnace base 200 to the top of the blast furnace base 200, the thickness inside the furnace at the joint between the pair of bricks is determined by the clip type displacement meter 1. Measure sequentially. At the same time, the strain gauge 2 sequentially measures each strain generated inside the furnace of the pair of bricks. After installing the bottom mantel 100A on the blast furnace base 200, it is inspected whether or not a void is formed outside the furnace at the joint between the pair of bricks based on the change in the thickness of the joint and the change in the strain. .
Thereby, even if a gap larger than the thickness of the inside of the furnace joint between the bricks is formed on the outside of the furnace between the brick joints, the clip-type displacement meter 1 and the strain gauge 2 can reliably detect the gap. it can. Therefore, defects in the brick layer 150 that cannot be confirmed by appearance observation from the inside of the furnace can be detected.

(4-3) Regarding defects generated in the stamp material layer 140, after the furnace bottom mantel 100A is manufactured in advance in a block manufacturing process at a place other than the blast furnace base 200, the inside of the furnace and the outside of the furnace in the stamp material layer 140 are Displacement meters 4 and 5 are installed for each. Then, in the construction process, the thickness of the stamp material layer is sequentially measured by the displacement meters 4 and 5 until the bottom mantel 100A is moved from the place other than the blast furnace base 200 onto the blast furnace base 200. After the furnace bottom mantel 100A is installed on the blast furnace base 200, it is inspected based on the change in the thickness of the stamp material layer 140 whether or not voids are formed at the interface inside or outside the furnace of the stamp material layer 140. .
This detects voids formed at the interface between the brick layer 150 and the stamp material layer 140 and voids formed at the interface between the stamp material layer 140 and the cooling layer 130 that cannot be confirmed by appearance observation from the inside of the furnace. be able to.

(4-4) After the installation of the bottom mantel 100A on the blast furnace foundation 200, the gap generated on the outside of the furnace between the pair of adjacent vertical bricks 152 and the pair of ring bricks 154 adjacent to each other. A gap generated at the joint, a gap generated at the interface between the vertical brick 152 and the furnace brick 151 adjacent to each other, a gap generated at the interface between the ring brick 154 and the stamp material layer 140 facing this, a stamp The gap generated at the interface between the material layer 140 and the cooling layer 130 facing the material layer 140, the gap generated at the interface between the furnace brick 151 and the stamp material layer 140 facing the brick, and the stamp material layer 140 facing the same. The presence or absence of the generation of at least one of the voids generated at the interface with the cooling layer 130 covering the base 110 is inspected.
These voids are defects that reduce the life of the furnace, and the voids are repaired before the operation of the blast furnace 100 is started by detecting each void with the clip-type displacement meter 1, the strain gauge 2, and the displacement meters 3-6. be able to.
Therefore, hot metal can be prevented from being inserted between the bricks in the brick layer 150 when the blast furnace 100 is operated. Further, it is possible to ensure good heat conduction between the bricks in the brick layer 150, between the brick layer 150 and the stamp material layer 140, and between the stamp material layer 140 and the cooling layer 130. Loss speed can be reduced.

(4-5) When the gap A as a defect is formed in the joint between the bricks in the brick layer 150, the joint where the gap A is generated is opened after the furnace bottom mantel 100A is installed on the blast furnace base 200. . Then, the hole A is filled with the mortar D, and the gap A is closed by pushing the cylindrical plug F made of the same material as the brick into the hole B.
According to such a repair method, any of the gap formed in the joint between the vertical bricks 152, the gap formed in the joint between the buried bricks 153, and the gap formed in the joint between the ring bricks 154 Can also be repaired. Further, by pushing the plug F into the hole B, the mortar D reaches all the corners of the hole B, and the gap A can be completely closed. Furthermore, since the plug F is formed of the same material as the brick, good heat conduction between the bricks in the brick layer 150 can be ensured during operation of the blast furnace 100.

(4-6) The diameters of the hole B and the plug F are preferably 20 to 50 mm.
Thus, the mortar D can be favorably filled in the hole B by setting the diameter of the hole B. Further, by matching the diameter of the plug F with the diameter of the hole B and pushing the plug F into the hole B a plurality of times, the mortar D is spread to every corner of the hole B, and the gap A is more completely formed. Can be occluded.

(4-7) The depth L of the hole B, the depth L, the area S of the surface facing the joint in the vertical brick 152, the average thickness t of the gap A formed in the joint, It is preferable that the diameter d of the part B is set under a condition that satisfies a relationship of 0.7 ≦ (π · d ² · L / 4) / (S · t) ≦ 1.0.
By doing in this way, the filling amount of the mortar D can be made suitable, and the space | gap A can be obstruct | occluded suitably.

(4-8) The furnace bottom mantel 100A is provided with an opening 190 that penetrates the iron shell 120 and the cooling layer 130. When a void as a defect is formed at the furnace inner or outer interface of the stamp material layer 140, heat conduction from the opening 190 to the stamp material layer 140 is performed after the furnace bottom mantel 100A is installed on the blast furnace base 200. The gap is closed by press-fitting a filler having a rate of 10 Wm / K or more.
By press-fitting the filler into the stamp material layer 140 in this manner, the filler is uniformly impregnated into the stamp material layer 140, and the interface between the stamp material layer 140 and the ring brick 154 or the stamp material layer 140. The void formed at the interface between the cooling layer 130 and the cooling layer 130 can be closed. Further, since the existing opening 190 is used for repair, the defect of the stamp material layer 140 can be repaired efficiently without dismantling the brick layer 150 after the furnace bottom mantel 100A is installed on the blast furnace base 200. Therefore, since the time required for repair can be shortened, the repair time of the entire blast furnace 100 can be shortened.
Furthermore, since the filler used for repairing the voids has a thermal conductivity of 10 Wm / K or more, the brick layer 150 and the cooling layer 130 are good via the stamp material layer 140 when the blast furnace 100 is operated. Heat conduction can be secured. Therefore, it is possible to prevent a decrease in the furnace life.

(4-9) In the bottom mantel 100A in the first state, the displacement meter 3 is installed between a pair of vertical bricks 152 adjacent to each other in the horizontal direction. Thereby, it is possible to inspect whether or not a gap is generated at the interface between the pair of vertical bricks 152 adjacent to each other in the horizontal direction and the furnace brick 151 adjacent to the lower side.
Further, in the furnace bottom mantel 100A in the second state, the vertical bricks adjacent to each other in the vertical direction, between the pair of buried bricks 153 adjacent in the horizontal direction, between the ring bricks 154 adjacent to each other in the vertical direction, and adjacent to each other in the vertical direction. Displacement meter 3 is installed between 152 and ring brick 154. Thereby, a pair of middle buried bricks 153 adjacent to each other in the horizontal direction and an interface between the middle buried bricks 153 adjacent to the lower side, between the ring bricks 154 adjacent to each other in the vertical direction, and the vertical brick 152 Generation | occurrence | production of the space | gap between the ring bricks 154 can be test | inspected.
Therefore, since the gap formed between the bricks can be detected after the furnace bottom mantel 100A is installed on the blast furnace foundation 200, the service life of the blast furnace 100 can be increased by repairing these gaps as appropriate.

(4-10) In the furnace bottom mantel 100A in the first or second state, the displacement meter 6 for measuring the thickness change of the stamp material layer 140 is disposed inside the hearth brick 151 and the stamp material layer 140. Is provided.
Thereby, the thickness change of the bottom face part of the stamp material layer 140 can be measured. For this reason, gaps generated at the interface between the furnace brick 151 and the stamp material layer 140 facing the furnace brick 151 and the stamp material layer 140 in the vicinity of the displacement meter 6 that cannot be confirmed by external observation from the inside of the furnace are opposed to this. It is possible to inspect voids generated at the interface with the cooling layer 130 that covers the base 110 to be formed. Therefore, the service life of the blast furnace 100 can be increased by repairing the gap before the operation of the blast furnace 100.
Further, since the cable 62 in the displacement meter 6 is drawn to the outside of the blast furnace 100 using the pipe 151A provided in the furnace bottom mantel 100A in advance, the design change of the entire blast furnace 100 is required to provide the displacement meter 6. Therefore, defect inspection can be performed at low cost.

(5) Modifications Note that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

For example, in the above embodiment, a new furnace manufactured in advance at a place other than the blast furnace base 200 by dismantling the bottom mantel 100A and the ring blocks 100B to 100E constituting the furnace body of the blast furnace 100 using the lift-up method. Although the repair method of the blast furnace which piles up bottom mantel 100A and the ring-shaped blocks 100B-100E using a lift-up construction method was illustrated, it is not restricted to this.
That is, for example, as in the configuration described in Patent Document 1 above, only the bottom block, that is, the bottom mantel, is repaired on the blast furnace foundation in place, and the other ring blocks are disassembled and stacked by the lift-up method. This can also be applied to the configuration to be performed.

Further, for example, not only repairing the blast furnace 100, a new furnace bottom mantel 100A and ring-shaped blocks 100B to 100E manufactured in advance at a place other than the blast furnace foundation 200 are transported to the blast furnace foundation 200 and lifted up. It can also be applied when building a new blast furnace by stacking.
That is, the present invention can be applied to any configuration that includes a process in which a plurality of blocks are manufactured in advance at a place other than the blast furnace foundation and the blocks are moved to the blast furnace foundation.

  In the said embodiment, although the case where the defect of the stamp material layer 140 in the bottom mantle 100A and the brick layer 150 was inspected and repaired was illustrated, it is not restricted to this. That is, the present invention can be applied to any stamp material layer and brick layer inside the ring-shaped blocks 100B to 100E constituting the furnace body of the blast furnace 100.

It is the sectional side view which showed typically the structure of the hearth part vicinity of a common blast furnace. It is the schematic diagram which showed the whole structure of the blast furnace for demonstrating the repair method of the blast furnace in one Embodiment of this invention. It is the side view which showed typically the furnace bottom mantel of the 1st state in the said embodiment, and the dolly which conveys this furnace bottom mantel. The brick structure of the furnace bottom mantel of the 1st state in the said embodiment is shown typically, (A) is a top view, (B) is a cross section which follows the AA line in (A). It is the arrow view which shows, and the arrow view which shows the cross section which follows a BB line. It is the side view which showed typically the furnace bottom mantel of the 2nd state in the said embodiment, and the dolly which conveys this furnace bottom mantel. It is the top view which showed typically the installation point of the displacement meter with respect to the furnace bottom mantel in the said embodiment. It is a schematic diagram for demonstrating the method to test | inspect the space | gap between each brick in the furnace bottom mantel of the 2nd state in the said embodiment. It is the schematic diagram which showed the displacement meter and strain gauge which measure the displacement to the thickness direction of the joint between bricks which adjoin each other in the said embodiment. It is the schematic diagram which showed the displacement meter which measures the displacement to the shear direction of the joint between adjacent bricks in the said embodiment. It is the sectional side view which showed typically the displacement meter which measures the displacement to the thickness direction of the stamp material layer side part in the said embodiment. It is the sectional side view which showed typically the displacement meter which measures the displacement to the thickness direction of the stamp material layer side part in the said embodiment, and an opening part. It is the sectional side view which showed typically the displacement meter which measures the displacement to the thickness direction of the stamp material layer bottom face part in the said embodiment. In the said embodiment, when a space | gap is formed in the joint between adjacent bricks, it is a schematic diagram for demonstrating the method of repairing the said space | gap, (A) was formed in the joint between bricks. (B) shows a state in which a hole is formed in the joint, (C) shows a state in which the hole is filled with mortar, and (D) shows a state in which a plug is pushed into the hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Blast furnace 100A ... Furnace bottom mantel 100B-100E ... Ring-shaped block 110 ... Base 120 ... Iron skin 130 ... Cooling layer 140 ... Stamp material layer 150 ... Brick layer 151 ... Furnace brick 152 ... Vertical brick 154 ... Ring brick 160 ... hearth 190 ... opening 200 ... blast furnace foundation 1 ... clip-type displacement meter 2 ... strain gauge 3-6 ... displacement meter A ... void B ... hole D ... mortar F ... plug

Claims (8)

Several blocks with a brick layer and stamp material layer composed of multiple bricks in advance are manufactured in a place other than the blast furnace foundation, and the blast furnace furnace body is constructed by stacking these blocks on the blast furnace foundation. Alternatively, when repairing, a method for inspecting whether a defect has occurred in the block,
Before moving the block from a place other than the blast furnace foundation onto the blast furnace foundation, the thickness of the joint between the bricks in the brick layer, the strain generated in the brick, and the thickness of the stamp material layer A defect inspection method for a block of a blast furnace furnace body, characterized by sequentially measuring and inspecting whether or not a defect has occurred in the brick layer and the stamp material layer in the block. In the blast furnace furnace block defect inspection method according to claim 1,
After manufacturing the block in a place other than the blast furnace foundation in advance, a displacement meter is installed inside the furnace between a pair of bricks adjacent to each other in the brick layer of the block, and distortion is applied to the inside of each furnace of the pair of bricks. Set the gauge,
While moving the block from a place other than the blast furnace foundation to the blast furnace foundation, the thickness inside the furnace at the joint between the pair of bricks is sequentially measured with the displacement meter, and the strain gauge Each strain generated inside the furnace of the pair of bricks is sequentially measured,
After installing the block on the blast furnace foundation, inspecting whether or not a void is formed outside the furnace in the joint between the pair of bricks based on the change in the thickness of the joint and the change in the strain. A defect inspection method for a block of a blast furnace furnace body characterized by In the defect inspection method for a block of a blast furnace furnace body according to claim 1 or 2,
In advance, after producing the block at a place other than the blast furnace foundation, install a displacement meter for each of the furnace inner side and the furnace outer side in the stamp material layer,
Until the block is moved from a place other than the blast furnace foundation onto the blast furnace foundation, the thickness of the stamp material layer is sequentially measured with the displacement meter,
After installing the block on the blast furnace foundation, it is inspected based on a change in the thickness of the stamp material layer whether or not voids are formed in the stamp material layer. Defect inspection method. In the defect inspection method of the block of the blast furnace furnace body in any one of Claims 1 thru | or 3,
The block is a furnace bottom mantel that constitutes the hearth of the blast furnace furnace body,
The furnace bottom mantel includes a base, a substantially cylindrical iron skin standing on the base, a cooling layer provided in a state of covering the base and the inside of the furnace of the iron skin, A stamp material layer laminated to the stamp material layer, and a brick layer laminated on the stamp material layer,
The brick layer includes a plurality of hearth bricks constituting a disc-shaped furnace bottom surface, a plurality of vertically long vertical bricks laminated on the furnace brick, and laminated on the furnace bricks. A plurality of ring bricks surrounding the outer periphery of the vertical brick,
After installation on the blast furnace foundation of the furnace bottom mantel,
A void generated on the outside of the furnace at the joint between the pair of adjacent vertical bricks,
A gap generated in a joint between a pair of the ring bricks adjacent to each other;
A gap generated at the interface between the vertical brick and the furnace brick adjacent to each other;
A gap generated at an interface between the ring brick and the stamp material layer facing the ring brick;
A gap generated at an interface between the stamp material layer and the cooling layer facing the layer,
A gap generated at an interface between the furnace brick and the stamp material layer facing the brick;
A block of a blast furnace body characterized by inspecting whether or not at least one of the voids generated at an interface between the stamp material layer and the cooling layer covering the base opposite thereto is generated. Defect inspection method. A method for repairing the defect when the defect is detected by the defect inspection method for a block of a blast furnace furnace body according to any one of claims 1 to 4,
When a void as the defect is formed in the joint between the bricks,
After the block is installed on the blast furnace foundation, the joint where the void is generated is opened, the hole is filled with mortar, and a cylindrical plug made of the same material as the brick is pushed into the hole. A method for repairing a defect in a block of a blast furnace furnace body, characterized in that the gap is closed. In the blast furnace furnace block defect repairing method according to claim 5,
A method for repairing a defect in a block of a blast furnace furnace body, wherein the hole and the diameter of the plug are 20 to 50 mm. In the method of repairing a defect in a block of a blast furnace furnace body according to claim 5 or claim 6,
The depth L of the hole, the depth L, the area S of the facing surface of the brick facing the joint, the average thickness t of the void formed in the joint, and the diameter of the hole d is set under the condition of satisfying the relationship of 0.7 ≦ (π · d ² · L / 4) / (S · t) ≦ 1.0. When the defect is detected by the defect inspection method for a block of a blast furnace furnace body according to claim 4, a method of repairing the defect,
The furnace bottom mantel is provided with an opening that penetrates the iron skin and the cooling layer,
When a void as the defect is formed at the interface inside the furnace or outside the furnace in the stamp material layer,
After installing the furnace bottom mantel on the blast furnace foundation, the gap is closed by press-fitting a filler having a thermal conductivity of 10 Wm / K or more into the stamp material layer from the opening. Body block defect repair method.

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