JP6482961B2 - Refractory material structure of blast furnace morning glory and refractory construction method - Google Patents

Description

  The present invention relates to a refractory material structure and a refractory material construction method for a blast furnace morning glory.

In a blast furnace for iron making, it is necessary to refurbish, that is, to renew the furnace body every ten years.
Renewal of the furnace body is performed by removing the old furnace body constructed on the foundation of the blast furnace installation site and constructing a new furnace body on the foundation.
When renewing the furnace body, dismantling the old furnace body on the foundation and then constructing a new furnace body will cause problems such as a long blast furnace blow-off period and a large economic loss per day. is there.

For such problems, a blast furnace furnace repair method using a so-called ring block method has been adopted (see Patent Document 1).
In the ring block method, the old furnace body is divided into a plurality of mantels (ring blocks), and the divided mantels are sequentially removed from the foundation. On the other hand, prior to the dismantling of the old furnace body, similar mantels were newly assembled in advance at another site, and these were sequentially carried onto the foundation from which the old mantel was removed, and assembled to form the new furnace body. To construct.

In such a ring block construction method, the mantle of the new furnace body can be manufactured in advance, and the blow-off period of the blast furnace can be shortened.
Among them, the construction method of Patent Document 1 is a large block construction method in which the mantel is enlarged and the blast furnace is divided into about 4 giant mantels. It is effective for shortening the period.

In addition, when the furnace volume is not changed, a method of constructing a new furnace body by reusing the iron core of the old furnace body and re-installing only the refractory material and stave inside it is adopted. ing.
In such a construction method that recycles the iron skin, it is not possible to shorten the construction period by prior construction like the ring block construction method described above, but it is not necessary to divide the furnace body or to rejoin it. It is highly evaluated for its economic efficiency.

JP 2009-62613 A

As described above, an increase in the blast furnace blowing-out period causes a large amount of economic loss. Therefore, in order to suppress this as much as possible, further shortening of the construction period is desired.
Of the furnace bodies, the morning glory uses a brick structure as the refractory material on the inner surface of the stave installed along the inner side of the iron skin, and is the top of the brick structure stacked from the bottom of the furnace. The upper part will be constructed.

The construction of such a morning glory brick structure requires approximately 5 days, although it depends on the furnace volume.
However, the morning glory part is the uppermost part of the brickwork, and is the last part to be constructed after the construction of the brick structure from the furnace bottom to the tuyere is completed. Due to such restrictions on the construction procedure, there is a problem that the time required for construction of the brick structure in the morning glory cannot be shortened.

  Furthermore, in the morning glory part, a shape having an inverted conical shape whose diameter increases toward the upper side is common. After the operation of the blast furnace, the bricks move upward due to thermal expansion, but the bricks and the stave are sheared and the edges are cut and the conical shape is reversed, so there is a gap between the bricks and the stave. This causes a problem that the sliding force is reduced, and the bricks are loosened and fall off easily.

  The objective of this invention is providing the refractory material structure and refractory material construction method of a blast furnace morning glory part which can shorten a construction period.

  The refractory material structure of the blast furnace morning glory portion of the present invention is a refractory material structure of a blast furnace morning glory portion having a stave installed along the inner surface of the iron skin, and an upper portion of the morning glory portion is a furnace inner surface of the stave The lower part of the morning glory part is composed of refractory bricks stacked along the furnace inner surface of the stave, and is formed between the amorphous refractory material and the refractory brick. Is characterized in that an expansion absorbing material that shrinks or burns down during operation of the blast furnace is installed.

In such this invention, the refractory brick of the lower part of the morning glory part can ensure continuity with the fire bricks stacked from the tuyere part below the morning glory part.
Moreover, about the upper part of a morning glory part, the prior construction by the spraying of an irregular refractory material etc. can be performed, and the effect of a work period shortening can be acquired.

  As the irregular refractory material formed in the upper part of the morning glory portion, a groove for fixing the irregular refractory material usually provided on the inner surface of the stave may be used. Such stave grooves generally have a narrow groove width on the side that opens to the inner side of the furnace and are formed wider on the back, and irregular refractory material that has entered the groove by spraying or the like is locked in the groove. And does not fall off easily. Therefore, an irregular refractory material may be applied to the inner surface of the stave that is fixed to the iron skin, or an irregular refractory material may be preliminarily applied to the inner surface of the stave. The attached stave can be carried into the furnace and installed inside the iron skin.

If the area ratio between the irregular refractory material in the upper part and the refractory brick in the lower part in the morning glory part is at least 30% or more, the effectiveness can be found in shortening the work period.
The irregular refractory material in the upper part of the morning glory part may be further widened, and the effect of shortening the work period is increased by increasing the area ratio of the irregular refractory material. However, when the area of the irregular refractory material expands and reaches the lower part of the morning glory part, the irregular refractory material is formed in a state of protruding to the furnace inner surface of the stave. Interference may occur when performing, and it may become impossible to construct. For this reason, in this invention, construction of an irregular refractory material is limited to the upper part of a morning glory part, and a lower part is later formed with a refractory brick.
In addition, it is preferable to adjust the range which constructs the amorphous refractory material of the upper part of a morning glory part with the inclination of a morning glory part.

The refractory brick to be constructed later in the lower part of the morning glory part is constructed lastly after the refractory brick is constructed in the part below the morning glory part. The refractory brick in the lower part of the morning glory is pushed up by thermal expansion after the operation of the blast furnace. And the pushed-up refractory brick may also push up the irregular-shaped refractory material previously constructed in the upper part of the morning glory part. In order to avoid such push-up, an expansion absorber that is shrunk or burnt during operation of the blast furnace is installed between the irregular refractory material in the upper part and the refractory brick in the lower part.
The expansion absorber that shrinks or burns out during the operation of the blast furnace is preferably a material that can withstand high temperatures and is contractible, such as ceramic fiber or cushion mortar.

  In the refractory material structure of the blast furnace morning glory according to the present invention, it is desirable that a lattice-shaped frame that contracts or burns out during operation of the blast furnace is provided in the irregular refractory material.

The grid-like frame contracts or burns out during operation of the blast furnace, and gaps are formed in the vertical and horizontal directions between the refractory materials. Due to this gap, the thermal expansion of the refractory material is absorbed, and the refractory material is less likely to drop off even during operation of the blast furnace.
As the lattice-like frame that shrinks or burns out during operation of the blast furnace, thermoplastic resin foams, molded products, wood, paper materials, etc. can be used. Specifically, it is a material that softens or burns at a temperature of 200 ° C. or higher. It is desirable.
The thickness of the plate material forming the grid frame should be about 1 to 3 mm because it absorbs the thermal expansion of the partitioned area and requires some shape retention in the grid frame itself. Is desirable.

Furthermore, even if some irregular refractory materials fall off during the operation of the blast furnace, they are divided into a large number of irregular refractory blocks due to gaps formed after the grid frame shrinks or burns out. Therefore, it can be prevented from falling off at a stretch over a wide area, and clogging of the tuyere can be prevented.
For this reason, it is desirable that the partition size of the lattice frame is about 150 mm to 400 mm in length and width, more preferably about 200 mm to 300 mm in length and width.

  In the refractory material structure of the blast furnace morning glory according to the present invention, it is preferable that the irregular refractory material is fixed to the stave by an anchor standing from the inner surface of the stave.

In such a present invention, the amorphous refractory material is also fixed by the groove on the inner surface of the stave in the furnace, but is more firmly fixed to the stave by using an anchor standing from the inner surface of the stave in the furnace. can do.
In addition, when using the grid | lattice frame mentioned above, it is desirable to arrange | position at least 1 anchor to each frame.

  The refractory material construction method of the blast furnace morning glory part of the present invention is a refractory material construction method of the blast furnace morning glory part having a stave installed along the inner surface of the iron skin, and is a separate ground from the installation site of the blast furnace In the process of constructing a ring-shaped or block-shaped iron skin, and installing a plurality of staves along the inner surface thereof, an amorphous refractory material is press-fitted between the staves and the iron skin and between the staves. A ring-shaped or block-shaped mantel is constructed by the step of constructing and the step of constructing an irregular refractory material on the inner surface of the stave in the upper part of the morning glory, and the mantel is installed at the blast furnace installation site. After installing, a step of constructing a refractory brick in a lower part of the morning glory portion, and a step of installing an expansion absorber that shrinks or burns down during operation of the blast furnace between the refractory brick and the amorphous refractory material. line , It can be.

  In the present invention as described above, a ring-shaped or block-shaped mantel for morning glory can be pre-manufactured in an assembly site different from the installation site of the blast furnace, and at this time, above the morning glory on the inner surface of the stave furnace The construction of the irregular refractory material on the part can also be performed in advance.

  The refractory material construction method of the blast furnace morning glory part of the present invention is a refractory material construction method of the blast furnace morning glory part having a stave installed along the inner surface of the iron skin, in a place different from the installation site of the blast furnace, An irregular refractory material is applied to the upper part of the morning glory portion on the furnace inner surface of the stave, and after the stave is installed along the inner surface of the iron skin at the installation site of the blast furnace, It is good also as performing the process of constructing a refractory brick in a lower part, and the process of installing the expansion absorber which shrinks or burns down at the time of operation of the blast furnace between the refractory brick and the irregular refractory material.

  In such this invention, the stave by which the amorphous refractory material was constructed in the furnace inner surface in the place different from the installation site of a blast furnace is manufactured. Then, the stave with the irregular refractory material is carried into the installation site of the blast furnace and installed inside the iron shell, so that the irregular refractory material can be applied to the upper part of the morning glory portion. Then, the construction of the firebrick in the lower part of the morning glory part and the construction of the expansion absorbent between the firebrick and the amorphous fireproof material can be performed.

  According to the refractory material structure of the blast furnace morning glory part or the refractory material construction method of the blast furnace morning glory part of the present invention, the amorphous refractory material can be pre-constructed on the furnace inner surface of the stave, and the construction period can be shortened.

Sectional drawing which shows the blast furnace of 1st Embodiment of this invention. The expanded sectional view which shows the morning glory part of the said 1st Embodiment. The block diagram which shows the operation | work process of the said 1st Embodiment. Sectional drawing which shows the stave of the said 1st Embodiment. Sectional drawing which shows the mantel of the said 1st Embodiment. Sectional drawing which shows the state which installed the stave of the said 1st Embodiment. The front view which shows the furnace inner side surface in the state which installed the stave of the said 1st Embodiment. Sectional drawing which shows the state which constructed the seal | sticker to the stave of the said 1st Embodiment. The expanded sectional view which shows the state which installed the holder in the stave of the said 1st Embodiment. Sectional drawing which shows spraying of the irregular refractory material of the said 1st Embodiment. Sectional drawing which shows interference with the amorphous refractory material of the said 1st Embodiment, and a wire. The expanded sectional view which shows the morning glory part of 2nd Embodiment of this invention. The block diagram which shows the operation | work process of the said 2nd Embodiment. Sectional drawing which shows the state which installed the holder in the stave of the said 2nd Embodiment. The block diagram which shows the operation | work process of 3rd Embodiment of this invention. Sectional drawing which shows the stave of the said 3rd Embodiment. The front view which shows the furnace inner surface of the stave of the said 3rd Embodiment. Sectional drawing which shows the state which installed the stave of the said 3rd Embodiment. The front view which shows the furnace inner side surface in the state which installed the stave of the said 3rd Embodiment. The expanded sectional view which shows the support structure of the anchor and lattice frame of the said 3rd Embodiment. The front view which shows the installation state of the grid | lattice-like frame of the said 3rd Embodiment. The perspective view which shows the grid | lattice-like frame of the said 3rd Embodiment. The front view which shows the connection state of the grid | lattice-like frame of the said 3rd Embodiment. Sectional drawing which shows spraying of the irregular refractory material of the said 3rd Embodiment. Sectional drawing which shows the stave which has already sprayed the irregular refractory material of the said 3rd Embodiment. The front view which shows the furnace inner side surface of the stave already sprayed with the irregular refractory material of the said 3rd Embodiment. The block diagram which shows the operation | work process of 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 11 show a first embodiment of the present invention.

In FIG. 1, the blast furnace 1 has a furnace bottom 1A, tuyere 1B, morning glory 1C, furnace belly 1D, shaft 1E, and furnace top 1F in order from the bottom.
A number of staves 3 are installed along the inner surface of the iron skin 2 in the region from the furnace bottom 1A to the shaft 1E. Further, a refractory brick 4 is built on the furnace inner surface of the stave 3 in the region from the furnace bottom 1A to the morning glory 1C. A tuyere 5 is installed in the tuyere 1B.

The blast furnace 1 of this embodiment is constructed using a ring block method. For this purpose, the blast furnace 1 is divided into ten mantels B1 to B10.
Mantels B1 and B2 are allocated to the furnace bottom 1A. Mantels B3, B4, and B5 are assigned to the tuyere part 1B, the morning glory part 1C, and the furnace belly part 1D, respectively. Mantels B6 to B9 are assigned to the shaft portion 1E. Mantel B10 is assigned to the top 1F of the furnace.

  Among these, the mantel B3 for the tuyere part 1B and the mantel B2 for the upper stage of the furnace bottom part 1A are set to the height of three staves. The other mantels B1, B4 to B9 are set to the height of two staves.

Each of these mantels B1 to B10 is manufactured at a ground site different from the installation site.
In manufacturing the mantels B1 to B10, the iron skin 2 is constructed in a cylindrical shape at the assembly ground, and the stave 3 and pipes and equipment that can be pre-constructed are installed inside thereof.
However, the refractory brick 4 is installed after the mantels B1 to B10 are stacked on the installation site. This is because the refractory bricks 4 need to be stacked in order from the furnace bottom portion 1A side to the morning glory portion 1C.

  In this embodiment, a part of the refractory brick 4 that covers the furnace inner surface of the stave 3 in the morning glory part 1C is replaced with the spray-type amorphous refractory material 11 for pre-construction at the assembly site as the mantel B4. Incorporated, thereby shortening the work period.

  In FIG. 2, the mantel B4 of the morning glory part 1C is installed between the mantel B3 of the tuyere part 1B and the mantel B5 of the furnace part 1D.

  A mantel B5 of the furnace abdomen 1D has a refractory material structure on the inner surface of the furnace, in which a large number of staves 3 are installed along the inner surface of the iron shell 2, and an irregular refractory material 6 is interposed between the iron shell 2 and the stave 3. Filled. The surface of the stave 3 on the furnace inner surface is exposed to the furnace.

The mantel B3 of the tuyere 1B has a refractory material structure on the inner surface of the furnace, and a large number of staves 3 are installed along the inner surface of the iron skin 2. Between the iron skin 2 and the stave 3, an irregular refractory material 6 is provided. Is filled.
A large number of refractory bricks 4 are built on the inner surface of the stave 3 inside the furnace. An irregular refractory material 6 is also filled between some of the stave 3 and the refractory brick 4.
The tuyere 5 is installed in the mantel B3 of the tuyere 1B. The tuyere 5 is fixed to the iron skin 2. The stave 3 and the refractory brick 4 are installed so as to avoid the portion of the tuyere 5 extending through the inside of the furnace.

As for the mantel B4 of the morning glory part 1C, a large number of staves 3 are installed along the inner surface of the iron skin 2 as a refractory material structure on the inner surface of the furnace. Filled.
Of the two-stage stave 3 installed in the mantel B4, the entire inner surface of the furnace of the upper stave 3 and a part of the upper surface of the inner surface of the lower stave 3 (the morning glory portion shown by the region RC in FIG. 2). A spray-type amorphous refractory material 11 is constructed so as to cover the upper part).
The amorphous refractory material 11 is obtained by spraying the slurry-shaped amorphous refractory material 11 onto the inner surface of the furnace of the stave 3 to be solidified.

A number of refractory bricks 4 are built in the remaining portion of the inner surface of the furnace of the lower stave 3 (the lower portion of the morning glory portion indicated by the region RB in FIG. 2).
Between the refractory brick 4 and the irregular refractory material 11, a cushion mortar 13 which is an expansion absorbent is filled.
In the present embodiment, the ratio of the area RC where the spray-type amorphous refractory material 11 is constructed and the area RB covered with the refractory brick 4 is about 2: 1.

Hereinafter, the construction procedure of the morning glory part 1C of the blast furnace 1 in this embodiment and a specific detailed structure will be described.
In FIG. 3, in this embodiment, in addition to the work at the installation site of the blast furnace 1, the work at the assembly site and the factory is performed.
Among these, at the factory, a stave manufacturing step S11 for manufacturing the stave 3 is performed.

At the assembly site, the mantel assembly process S12, the stave installation process S13, the back surface installation process S14, and the inner surface installation process S15 are performed in order to manufacture the mantel B4, install the stave 3 or install the irregular refractory material 11. Is called.
At the installation site, a mantel installation process S16, a brick building process S17, and a finishing process S18 are performed in order to build up the blast furnace 1 by loading the mantel B4 constructed at the building site.

In the stave manufacturing step S11, the stave 3 is manufactured.
As shown in FIG. 4, the stave 3 is obtained by casting copper or cast iron to form a stave main body 30, and forming a groove 31 on the surface that becomes the inside of the furnace.
At this time, the groove 31 is formed such that the inner side expands with respect to the opening width of the inner surface of the furnace. With such a shape, when the irregular refractory material 11 is sprayed and applied to the furnace inner surface of the stave 3, a part of the irregular refractory material 11 enters the groove 31 (see FIG. 10) and does not easily come off. You can

In the mantel assembly process S12, the ring-shaped iron skin 2 that forms the outer shell structure of the mantel B4 is formed.
As shown in FIG. 5, the pedestal 21 is arranged in a circular shape at the building site, and a steel plate 2 is formed by connecting a steel plate in a ring shape thereon.
In the stave installation step S13, the stave 3 manufactured in the stave manufacturing step S11 is carried into the ground assembly site, and the stave 3 is formed into a ring shape in the mantel ground assembly step S12 as shown in FIG. Install along the inner surface of 2.

In the back construction step S14, the mantel B4 on which the stave 3 is installed is filled with the irregular refractory material 6 in the back of the stave 3 (the gap with the iron skin 2) and the gap between the stave 3 respectively.
As shown in FIG. 6 and FIG. 7, when filling the irregular refractory material 6, the gap between the base 21 and the stave 3 is sealed with a seal 22 so as not to leak from each gap, A gap between the upper and lower staves 3 is sealed with a seal 23, and a gap between the staves 3 arranged in the lateral direction is sealed with a seal 24.
The seals 23 and 24 are removed before the spraying step 16 after the amorphous refractory material 6 is solidified (see FIG. 10).

In inner surface construction process S15, first, as shown in FIG. 8 and FIG. 9, the holder 14 used when spraying and fixing the amorphous refractory material 11 to the stave 3 installed in the mantel B4 is installed.
The holder 14 includes a long holding plate 141 that is continuous in the horizontal direction, and support members 142 that are arranged along the holding plate 141 at a predetermined interval. Fixed to the side.
As shown in FIG. 8, the holder 14 is installed on the lower stave 3 of the mantel B4 along the lower edge of the region RC. At this time, the holding plate 141 is continuously installed in the horizontal direction, but the support member 142 is intermittently installed at appropriate intervals such as both sides and an intermediate position of each stave 3.

In the inner surface construction step S <b> 15, following the installation of the holder 14, the slurry-like amorphous refractory material 11 is sprayed onto the furnace inner surface of the stave 3.
As shown in FIG. 10, the slurry-like amorphous refractory material 11 is sprayed from its nozzle 110 toward the furnace inner surface of the stave 3 using an existing spray device.

From the above-mentioned mantel assembly process S12 to inner surface construction process S15, the irregular refractory material 6 and the stave 3 are installed inside the iron shell 2, and the spray-type irregular refractory material is sprayed on the region RC on the furnace inner side surface of the stave 3. Mantel B4 on which No. 11 is constructed is manufactured at the assembly ground.
When mantels B1 to B10 including mantel B4 can be manufactured, these are transported from the assembly site to the installation site, and loaded onto the site foundation to assemble the blast furnace 1 (see FIG. 1).

In the mantel installation step S <b> 16, the mantels are carried in order from the upper mantel and are lifted by a jack or the like installed on the furnace body. Then, after fixing the mantel B1 of the furnace bottom 1A, the upper mantel is sequentially lowered and fixed to the mantel already fixed below. These operations can be performed based on the existing ring block method.
In the morning glory portion 1C, when the mantel B4 and the upper and lower mantels B3 and B5 can be fixed, the brick building process S17 and the final finishing process S18 for constructing the refractory brick 4 are performed.

In the brick building step S17, the refractory brick 4 is built in the region RB (see FIG. 2) on the furnace inner side surface of the mantel B4.
As described above, the furnace inner side surface of the mantel B4 has the upper 2/3 region RC covered with the spray-type amorphous refractory material 11 and the lower 1/3 region RB covered with the refractory brick 4. Construction of the irregular-shaped refractory material 11 in the region RC has been completed by the above-described inner surface construction process S15 at the building site.

As shown in FIG. 2, the construction of the refractory brick 4 in the finishing step S18 is performed by stacking on the refractory brick 4 of the tuyere 1B.
That is, as shown by the one-dot chain line in FIG. 1 described above, first, the refractory bricks 4 are constructed on the bottom surfaces of the mantels B1 and B2 and the inner surface of the furnace in the furnace bottom portion 1A, and stacked on top of the tuyere portion 1B. The refractory brick 4 is built on the inner surface of the mantel B3, and the refractory brick 4 is built on the inner surface of the mantel B4.

When the refractory brick 4 on the inner surface of the furnace of the mantel B4 reaches the vicinity of the amorphous refractory material 11 already constructed in the region RC, as shown in FIG. 2, the lower surface of the irregular refractory material 11 and the refractory brick 4 A fireproof cushion mortar 13 is pushed in between the upper surface and installed.
As described above, the refractory brick 4 is built in the region RB on the inner surface of the mantel B4, and the refractory material structure on the inner surface of the mantel B4 is completed together with the spray-type amorphous refractory material 11 covering the region RC.

According to this embodiment, the following effects can be obtained.
The amorphous refractory material 11 of the present embodiment is fixed to the furnace inner surface of the stave 3 so as to cover the furnace inner surface of the stave 3. At this time, the pre-construction of the irregular refractory material 11 on the stave 3 can be easily and efficiently performed by spraying, and the pre-construction can be performed at a ground site other than the blast furnace 1 installation site. By carrying out in parallel with other work at the installation site, the overall construction period can be shortened.

In the present embodiment, the irregular refractory material 11 is applied to the region RC that is the upper part of the morning glory portion 1C of the blast furnace 1, and on the inner surface of the stave 3 below the irregular refractory material 11, the morning glory portion 1C is provided. The refractory brick 4 was affixed to the area RB which is the lower part.
For this reason, the region RC in the morning glory portion 1C (the portion above the region RB where the fire brick 4 is built) while ensuring continuity with the fire brick 4 stacked from the tuyere portion 1B below the morning glory portion 1C. Can be pre-constructed by spraying the irregular refractory material 11, and the effect of shortening the work period can be obtained.
Note that the area ratio of the spray-type amorphous refractory material 11 and the refractory brick 4 in the morning glory portion 1C is 2/3, that is, about 67%, which is effective for shortening the construction period.

  In the present embodiment, the irregular refractory material 11 is applied to the region RC that is the upper portion of the morning glory portion 1C, and the fire brick 4 is attached to the region RB that is the lower portion of the morning glory portion 1C. The influence with respect to loading of the refractory brick 4 in the lower part can be eliminated.

In FIG. 11, a crane 49 installed in the furnace is frequently used for loading the refractory bricks 4 at the furnace bottom 1 </ b> A and the tuyere 1 </ b> B below the morning glory 1 </ b> C.
If the amorphous refractory material 11 is applied over the entire height of the morning glory portion 1 </ b> C, the amorphous refractory material 11 protrudes from the inner surface of the stave 3 with a predetermined thickness. For this reason, the protruding irregular refractory material 11 and the wire 48 of the crane 49 interfere with each other, and it becomes impossible to install the refractory brick 4 in the furnace bottom 1A and tuyere 1B below the morning glory 1C.
On the other hand, in the present embodiment, the irregular refractory material 11 is applied to the region RC that is the upper portion of the morning glory portion 1C, and the refractory brick 4 is attached to the region RB that is the lower portion of the morning glory portion 1C. The influence on the loading of the refractory brick 4 at the portion below the morning glory portion 1C can be eliminated without interfering with the wire 48.

In the present embodiment, a cushion mortar 13 is installed between the refractory brick 4 and the amorphous refractory material 11, which is an expansion absorbent that contracts or burns away during operation of the blast furnace 1.
For this reason, even when the refractory brick 4 and the irregular refractory material 11 are thermally expanded when the blast furnace 1 is operated, the deformation is absorbed by the cushion mortar 13 which is an expansion absorbent, and the refractory brick 4 and the irregular refractory material 11. It is possible to prevent the drop-out due to mutual collisions.

In the present embodiment, the blast furnace 1 is constructed by a ring block method using a plurality of mantels B1 to B10, and the mantel groundwork process S12 for manufacturing the mantel B4 at a groundwork site different from the installation site of the blast furnace 1. And a stave installation step S13 for installing the stave 3 along the inner surface of the iron shell 2 of the mantel B4, and an inner surface construction step S15 for the inner surface of the stave 3 in the furnace, and at the installation site of the blast furnace 1, The mantel installation step S16, the brick building step S17, and the finishing step S18 for building the blast furnace 1 by stacking are performed.
For this reason, mantel B4 or other mantels can be pre-manufactured at a building site different from the site where the blast furnace 1 is installed, and at this time, the construction of the irregular refractory material 11 on the inner surface of the stave 3 is also performed in advance. It can be carried out.

[Second Embodiment]
Each of FIGS. 12 to 14 shows a second embodiment of the present invention.
In the first embodiment described above, the stave 3 is manufactured in the factory, and the construction of the mantel B4, the installation of the stave 3 or the construction of the irregular refractory material 11 is performed in the construction site.
On the other hand, in the present embodiment, the stave 3 is manufactured at the factory and the irregular refractory material 11 is constructed, and the stave 3 with the irregular refractory material 11 is attached to the mantel B4 at the installation site.

The blast furnace 1 of this embodiment has a furnace bottom 1A, tuyere 1B, morning glory 1C, furnace belly 1D, shaft 1E, and furnace top 1F in order from the bottom as in the first embodiment described above (FIG. 1). reference).
As shown in FIG. 12, a tuyere 5 is installed in the tuyere 1B, and an indeterminate refractory material 6, a stave 3 and a refractory brick 4 are installed as a refractory material structure on the inner surface of the iron shell 2. Yes. In addition, an indeterminate refractory material 6 and a stave 3 are installed as a refractory material structure on the inner surface of the core 2 of the furnace shell 1D.

On the inner surface of the morning glory portion 1C, an irregular refractory material 6, a stave 3, a spray-type irregular refractory material 11 and a refractory brick 4 are installed as a refractory material structure.
Of these, the spray-type amorphous refractory material 11 is applied to the inner surface of the upper stage 3 among the two stages 3 installed in the morning glory 1C.

Moreover, the refractory brick 4 is constructed on the furnace inner side surface of the lower stabe 3 among the two stairs 3 installed in the morning glory part 1C.
Of the refractory bricks 4 constructed on the inner surface of the lower stave 3, the one inside the furnace extends to the lower part of the upper stave 3 so as to cover the lower part of the spray-type amorphous refractory material 11. Is installed.
Between the lower end of the irregular refractory material 11 and the upper end of the iron brick 2 side of the refractory bricks 4 constructed on the inner surface of the furnace of the lower stave 3, the fireproof cushion mortar 13 is pushed in and installed. Has been.

  Note that the stave 3, the refractory brick 4, the irregular refractory material 6, the spray-type irregular refractory material 11, the cushion mortar 13 and the like in the present embodiment are the same as those in the first embodiment described above, and redundant descriptions are given. Is omitted.

Next, the construction procedure of the morning glory part 1C of the blast furnace 1 in this embodiment and a specific detailed structure will be described.
As shown in FIG. 13, in this embodiment, the stave 3 is manufactured in advance in a factory (stave manufacturing step S21).
In the stave manufacturing step S21, an amorphous refractory material 11 is sprayed on the surface of the stave 3 installed on the upper stage of the morning glory 1C as shown in FIG. 14 (inner surface construction step S22).

  Regarding the manufacture of the stave 3 in the stave manufacturing step S21 and the inner surface construction step S22 for spraying the irregular refractory material 11 to the stave 3, the same procedure as the stave manufacturing step S11 and the inner surface construction step S15 of the first embodiment described above. The same can be used for the holder 14 (see FIG. 14).

  However, in the first embodiment described above, the irregular refractory material 11 is applied to the region RC extending over the plurality of staves 3, but in the present embodiment, the irregular refractory material is disposed on the inner surface of the single stave 3 in the furnace. 11 is sprayed and installed.

On the other hand, in the installation site, a mantel installation process S23, a stave installation process S24, a back surface construction process S25, a brick building process S26, and a finishing process S27 are performed.
In the mantel installation step S23, the iron skin 2 is assembled at the installation site and installed on the morning glory 1C. In the case of blast furnace repair, the old mantle B4 may be repaired and reused.

In the stave installation step S <b> 24, the stave 3 is installed inside the iron skin 2.
In the back construction step S25, the irregular refractory material 6 is installed between the stave 3 and the iron skin 2.
These steps are the same as the stave installation step S13 and the back surface construction step S14 of the first embodiment described above.
However, in this embodiment, since the irregular refractory material 11 is preliminarily applied to the upper stave 3, at this stage, the irregular refractory material 6, the stave 3, Up to the irregular refractory material 11 will be installed.

  After this, following the construction of the refractory bricks 4 at the furnace bottom 1A or tuyere 1B by the brick building step S26, the refractory bricks 4 are stacked on the inner surface of the furnace of the lower stave 3, and some refractory bricks 4 are morning glory. It is installed so as to cover the surface of the irregular refractory material 11 of the upper stave 3 of the part 1C. Furthermore, by finishing in detail by finishing process S27, the fireproof material structure of the morning glory part 1C shown in FIG. 12 is completed.

According to this embodiment, the same effect as that of the first embodiment described above can be obtained.
However, in this embodiment, it is not necessary to use a ground building, and the transportation of the mantel B4 from the ground building to the installation site can be omitted. Moreover, the construction of the irregular refractory material 11 can be performed at the factory following the construction of the stave 3.
On the other hand, the range in which the spray-type amorphous refractory material 11 can be applied is about 2/3 of the morning glory part 1C in the first embodiment described above. It becomes about 1/2 of the morning glory part 1C. However, it is sufficiently effective as an effect of shortening the construction period.

[Third Embodiment]
15 to 26 show a third embodiment of the present invention.
In the first embodiment described above, the stave 3 is manufactured at the factory, the mantel B4 is installed at the assembly ground, the stave 3 is installed, or the amorphous refractory material 11 is installed, and the mantel B4 is installed at the installation site. The fire brick 4 was being built.
The basic procedure described above is the same in this embodiment. However, in this embodiment, an anchor and a lattice frame are used when the amorphous refractory material 11 is applied to the stave 3.

Hereinafter, the construction procedure of the morning glory part 1C of the blast furnace 1 in this embodiment and a specific detailed structure will be described.
In FIG. 15, in this embodiment, in addition to the work at the installation site of the blast furnace 1, the work at the assembly site and the factory is performed.
Among these, at the factory, a stave manufacturing step S31 for manufacturing the stave 3 is performed.

In the building site, in order to manufacture mantel B4, installation of stave 3 or construction of irregular refractory material 11, mantel assembly process S32, stave installation process S33, back construction process S34, anchor / lattice frame mounting process S35 and inner surface construction process S36 are performed.
At the installation site, a mantel installation process S37, a brick building process S38 for building the refractory brick 4 and a final finishing process S39 are performed in order to load the mantel B4 constructed at the building site and construct the blast furnace 1.

In the stave manufacturing step S31, the stave 3 is manufactured.
As shown in FIGS. 16 and 17, the stave 3 is obtained by casting copper or cast iron to form a stave body 30, and filling a groove 31 on the surface that becomes the furnace inside with a refractory material 32.
At this time, the plate 33 used for spraying the amorphous refractory material 11 (inner surface construction step S36) is fixed to the surface between the grooves 31 at a predetermined interval on the furnace inner surface of the stave 3.

  Since the mantel groundwork process S32, the stave installation process S33, and the back surface construction process S34 are the same as the mantel groundwork process S12, the stave grounding process S13, and the back surface construction process S14 of the first embodiment described above, overlapping explanations are given. Omitted.

  In the anchor / lattice frame attaching step S35, first, as shown in FIGS. 18 to 20, when the anchor 12 is installed on the stave 3 installed on the mantel B4, and the irregular refractory material 11 is sprayed and fixed. The holder 14 to be used is installed.

As shown in FIG. 20, the anchor 12 has a shaft portion 121 using a steel bar and a V-shaped branch portion 122 formed at the tip thereof, and is formed in a Y shape as a whole. It is a member. A male screw portion 123 as a fixed portion is formed at the base of the shaft portion 121.
A plate 33 is installed on the inner surface of the stave 3 (the portion that is not the groove 31 filled with the refractory material 32) in the stave manufacturing step S11. A female screw hole into which the male screw portion 123 can be screwed is attached to the plate 33. Is formed.
The anchor 12 is fixed in a state where the anchor 12 stands on the furnace inner surface of the stave 3 by screwing the male screw portion 123 into the plate 33.

  18 and 19, the anchor 12 is installed on the entire surface of the upper stave 3 of the mantel B4. On the other hand, the stave 3 on the lower side of the mantel B4 is installed only within the range of the above-described region RC (a region where the spray-type amorphous refractory material 11 is applied, see FIG. 2).

  As shown in FIG. 19, the anchor 12 is fixed so that the Y-shaped branch portion 122 is inclined with respect to the vertical direction, and is alternately directed in the opposite direction in each row arranged vertically. . That is, in FIG. 11, the anchors 12 in a row arranged in the horizontal direction are arranged in a direction in which the branch portions 122 are directed from the upper left to the lower right, and the anchors 12 in the upper and lower adjacent rows have the branch portions 122 in the upper right to the lower left. It is arranged in the direction toward.

  In FIG. 20, the holder 14 has a long holding plate 141 that is continuous in the horizontal direction, and support members 142 that are arranged along the holding plate 141 at a predetermined interval. 3 is fixed to the inner surface of the furnace.

  18 and 19, the retainer 14 is installed on the lower stave 3 of the mantel B4 along the lower edge of the region RC. At this time, the holding plate 141 is continuously installed in the horizontal direction, but the support member 142 is intermittently installed at appropriate intervals such as both sides and an intermediate position of each stave 3.

In the anchor / lattice frame attaching step S35, as shown in FIG. 21, the grid frame is applied to the region RC of the stave 3 where the amorphous refractory material 11 is sprayed using the holder 14 installed on the stave 3. 15 is installed.
As shown in FIG. 22, the grid frame 15 is an arrangement of frame units 150 formed by arranging the plate members 151 and 152 vertically and horizontally so as to form a grid and forming a shelf shape or a bookshelf shape.

The thickness of the plate material forming the grid-like frame 15 is about 1 mm to 3 mm because the grid-like frame itself needs to absorb some thermal expansion and has some shape retention. It is desirable.
The partition size of the grid frame 15 is about 150 mm to 400 mm in length and width, and more preferably about 200 mm to 300 mm in length and width.
The lattice frame 15 is made of a material that shrinks or burns out during operation of the blast furnace 1. For example, a foam or molded article of thermoplastic resin, wood, paper material, or the like can be used, and a material that softens or burns at a temperature of 200 ° C. or higher is desirable.

As shown in FIG. 23, when the frame unit 150 is connected in the horizontal direction, the end portions of the horizontal plate members 151 are connected by the joint plate 153. A similar joint plate can also be used when connecting in the vertical direction.
After these anchor / lattice frame attaching step S35, an inner surface construction step S36 in which the amorphous refractory material 11 is sprayed onto the furnace inner surface of the stave 3 is performed.

In the inner surface construction process S36, as shown in FIG. 24, the slurry-like amorphous refractory material 11 is sprayed onto the furnace inner surface of the stave 3 on which the grid frame 15 is installed.
The slurry-like amorphous refractory material 11 is sprayed from the nozzle 110 toward each frame of the lattice frame 15 using an existing spray device.

As shown in FIG. 25 and FIG. 26, by spraying the amorphous refractory material 11, the slurry-like amorphous refractory material 11 is filled in each frame of the lattice frame 15, and the inside surface of the stave 3 in each frame is inside the furnace. In this state, the amorphous refractory material 11 adheres to and the anchor refractory material 11 wraps around the anchor 12.
Thereafter, as time passes, the amorphous refractory material 11 in each frame of the grid frame 15 is solidified and fixed to the inner surface of the furnace of the stave 3 and firmly fixed to the stave 3 via the anchor 12. .

The lattice frame 15 is softened and washed away at the operating temperature of the blast furnace 1, and may be left after the amorphous refractory material 11 is solidified. Since the grid frame 15 is softened and washed away at the operating temperature of the blast furnace 1, a grid-like groove can be formed between the amorphous refractory material 11, and the amorphous refractory material 11 falls off. Even if it becomes the situation, it can be completed by dropping each section.
The lattice frame 15 may be removed when the amorphous refractory material 11 is solidified to some extent.

From the above-described mantel assembly process S32 to inner surface construction process S36, the irregular refractory material 6 and the stave 3 are installed inside the iron shell 2, and the spray-type irregular refractory material is sprayed on the region RC on the furnace inner side surface of the stave 3. Mantel B4 on which No. 11 is constructed is manufactured at the assembly ground.
When mantels B1 to B10 including mantel B4 can be manufactured, these are transported from the assembly site to the installation site, and loaded onto the site foundation to assemble the blast furnace 1 (see FIG. 1).
At this time, the mantel installation process S37 for installing the mantel B4, the brick building process S38 for constructing the refractory brick 4, and the finishing process S39 are the same as those in the first embodiment described above, and thus redundant description is omitted.

According to the present embodiment, the same effects as those of the first embodiment described above can be obtained, and the following effects can be obtained.
The amorphous refractory material 11 of the present embodiment is fixed to the furnace inner surface of the stave 3 so as to cover the furnace inner surface of the stave 3. At this time, since the anchor 12 is installed on the inner surface of the stave 3 in the furnace, the irregular refractory material 11 is not only fixed to the inner surface of the stave 3 but also rises from the inner surface of the stave 3. The anchor 12 is firmly joined to the stave 3. Further, the amorphous refractory material 11 is prevented from being displaced along the furnace inner surface of the stave 3 by the anchor 12.

  Therefore, according to the present embodiment, it is possible to firmly fix the amorphous refractory material 11 to the stave 3, and the refractory brick 4 is constructed on the inner surface of the stave 3 adjacent to the amorphous refractory material 11. Even if this is done, the refractory brick 4 can be prevented from falling off.

In this embodiment, since the anchor 12 has the shaft part 121 and the branch part 122, the branch part 122 is wrapped in the amorphous refractory material 11 and bites into the amorphous refractory material 11, and the fixing performance of the amorphous refractory material 11 is improved. Can be increased. Furthermore, the branch part 122 can be formed of a wire rod or a shaft member extending from the shaft part 121 in a branch shape, is easy to manufacture, and is easily wrapped during the spraying construction of the amorphous refractory material 11 to obtain a surely fixed state. Can do.
In the anchor 12 of the present embodiment, since the male screw portion 123 is used as the fixing portion, the fixing to the stave 3 is easy and the structure can be simplified.

In the present embodiment, a cushion mortar 13 is installed between the refractory brick 4 and the amorphous refractory material 11, which is an expansion absorbent that contracts or burns away during operation of the blast furnace 1.
For this reason, even when the refractory brick 4 and the irregular refractory material 11 are thermally expanded when the blast furnace 1 is operated, the deformation is absorbed by the cushion mortar 13 which is an expansion absorbent, and the refractory brick 4 and the irregular refractory material 11. It is possible to prevent the drop-out due to mutual collisions.

In the present embodiment, a grid frame 15 that shrinks or burns down during operation of the blast furnace 1 is installed along the furnace inner surface of the stave 3, and the spraying of the irregular refractory material 11 is performed in each grid of the grid frame 15. I did it.
For this reason, it is possible to prevent the amorphous refractory material 11 sprayed on the furnace inner surface of the stave 3 from being held down by the lattice frame 15 and flowing down or deformed by its own weight until solidification.
On the other hand, the lattice frame 15 is made of a material that contracts or burns out during operation of the blast furnace 1, so that gaps can be formed vertically and horizontally between the amorphous refractory materials 11. When such a gap is formed, the thermal expansion of the amorphous refractory material 11 is absorbed, and even when the blast furnace 1 is in operation, the refractory material is less likely to drop off.

  Furthermore, even if there is a situation in which the amorphous refractory material 11 falls off in the blast furnace 1 by leaving the lattice frame 15 that contracts or burns down during operation of the blast furnace 1 in the irregular refractory material 11, The irregular refractory material 11 is divided into a large number of blocks by the grid frame 15 at the time of construction, so that it can be prevented from falling off over a wide area at a stretch, and clogging of tuyere can be prevented.

[Fourth Embodiment]
FIG. 27 shows a fourth embodiment of the present invention.
In the third embodiment described above, the anchor 12 and the lattice frame 15 are added to the first embodiment described above, and for that purpose, the anchor / lattice frame attaching step S35 is added before the inner surface construction step S36 at the assembly site. Was.
In this embodiment, in the second embodiment described above, the anchor 12 and the lattice frame 15 are added, and the anchor / grid frame attaching step S42 is added before the inner surface construction step S43 in the factory.

  In this embodiment, the stave manufacturing process S41, the inner surface construction process S43, the mantel installation process S44, the stave installation process S45, the back surface construction process S46, the brick building process S47, and the finishing process S48 in the factory are shown in FIG. It is the same as the stave manufacturing process S21, the inner surface construction process S22, the mantel installation process S23, the stave installation process S24, the back surface construction process S25, the brick building process S26, and the finishing process S27 of the second embodiment shown, and redundant description is omitted. .

  On the other hand, the configuration of the anchor 12 and the lattice frame 15 added in the present embodiment, and the anchor / lattice frame attachment step S42 are as described in the third embodiment, and redundant description is omitted.

  According to this embodiment, the same effects as those of the second embodiment described above can be obtained, and the effects added in the third embodiment can be obtained.

[Modification]
Note that the present invention is not limited to the above-described embodiments, and modifications and the like within a scope in which the object of the present invention can be achieved are included in the present invention.
The anchor 12 for fixing the spray-type amorphous refractory material 11 is not limited to the Y-shape described above, but may be an L-shape, and is fixed to the stave 3 and firmly fixed to the amorphous refractory material 11. Anything can be used as long as it can be connected.
In addition, the specific shape, structure, dimensions, material, and the like of the grid frame 15 and its holder 14 can be selected as appropriate during implementation.

  In each embodiment mentioned above, the refractory material structure of the morning glory part 1C of the blast furnace 1 and the refractory material construction method were demonstrated. However, for example, in the blast furnace 1 in which the refractory brick 4 built from the furnace bottom 1A reaches the furnace belly 1D, the present invention can be applied as the refractory material structure and the refractory construction method of the furnace belly 1D.

  The present invention relates to a refractory material structure and a refractory material construction method for a blast furnace morning glory, and can be used to construct a blast furnace.

  DESCRIPTION OF SYMBOLS 1 ... Blast furnace, 11 ... Amorphous refractory material, 110 ... Nozzle, 12 ... Anchor, 121 ... Shaft part, 122 ... Branch part, 123 ... Male screw part, 13 ... Cushion mortar, 14 ... Holder, 141 ... Holding plate, 142 DESCRIPTION OF SYMBOLS ... Supporting member, 143 ... Bolt, 15 ... Lattice frame, 150 ... Frame body unit, 151 ... Plate material, 153 ... Joint plate, 1A ... Furnace bottom part, 1B ... Tuyere part, 1C ... Morning glory part, 1D ... Furnace part, 1E ... shaft part, 1F ... top of furnace, 2 ... iron skin, 21 ... pedestal, 22 ... seal, 23 ... seal, 24 ... seal, 3 ... stave, 30 ... stave body, 31 ... groove, 32 ... refractory material, 33 ... Plate, 4 ... Fire brick, 5 ... Feather, 6 ... Unshaped refractory material, B1 ... Mantel, B10 ... Mantel, B2 ... Mantel, B3 ... Mantel, B4 ... Mantel, B5 ... Mantel, RB ... Region, RC ... region.

Claims (5)

The refractory material structure of the blast furnace morning glory with a stave installed along the inner surface of the iron skin,
The upper part of the morning glory part is made of an irregular refractory material fixed to the furnace inner surface of the stave,
The lower part of the morning glory part is composed of refractory bricks stacked along the furnace inner surface of the stave,
A refractory material structure for a blast furnace morning glory, wherein an expansion absorber that shrinks or burns down during operation of the blast furnace is installed between the amorphous refractory material and the refractory brick. In the refractory material structure of the blast furnace morning glory according to claim 1,
A refractory material structure for a blast furnace morning glory, wherein a lattice-shaped frame that contracts or burns down during operation of the blast furnace is provided in the irregular refractory material. In the refractory material structure of the blast furnace morning glory according to claim 1 or claim 2,
The refractory material structure of a blast furnace morning glory part, wherein the irregular refractory material is fixed to the stave by an anchor standing from an inner surface of the stave. A refractory construction method for a blast furnace morning glory having a stave installed along the inner surface of the iron skin,
In an assembly site different from the installation site of the blast furnace, a step of constructing a ring-shaped or block-shaped iron skin, and installing a plurality of staves along the inner surface thereof, between the staves and the iron skin, and A ring-shaped or block-shaped mantel is formed by a process of press-fitting an amorphous refractory material between the staves and a process of applying an amorphous refractory material on the inner surface of the furnace of the stave above the morning glory. Build and
After the mantel is installed on the blast furnace installation site, a firebrick is applied to the lower part of the morning glory, and the firebrick contracts or burns between the firebrick and the irregular refractory during operation of the blast furnace. A method for constructing a refractory material for a blast furnace morning glory, characterized in that the step of installing an expansion absorber is performed. A refractory construction method for a blast furnace morning glory having a stave installed along the inner surface of the iron skin,
In a place different from the installation site of the blast furnace, an unfixed refractory material is applied to the upper part of the morning glory part on the furnace inner surface of the stave,
At the installation site of the blast furnace, after the stave is installed along the inner surface of the iron skin, a step of constructing a refractory brick in a lower part of the morning glory part, and between the refractory brick and the amorphous refractory material A method for constructing a refractory material for a blast furnace morning glory part, comprising performing a step of installing an expansion absorber that shrinks or burns down during operation of the blast furnace.

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