JP4417014B2 - Blast furnace construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a blast furnace construction method capable of shortening the construction period and improving safety of blast furnace construction.
[0002]
[Prior art]
When constructing a blast furnace due to refurbishment or constructing a new blast furnace, first, a work place (so-called ground assembly) is set up at a location different from the blast furnace foundation, which is the construction site. It is divided into two or more ring-shaped blocks from the top to the furnace bottom. At this time, construction of additional equipment such as refractory bricks and staves is completed at the assembly ground. In this way, each block manufactured at the assembly ground is transported to the blast furnace foundation to construct a blast furnace.
[0003]
In the construction of the blast furnace, the block A (that is, the top block of the furnace) located at the uppermost stage among the plurality of blocks is transported to the blast furnace foundation and is disposed on the furnace body support column 1 as shown in FIG. The furnace top block A is lifted using the lifting device 2a. Next, the second stage block B located at the lower stage of the furnace top block A is placed on the moving device 3, and the second stage block B is guided directly below the furnace top block A.
[0004]
Next, the furnace top block A is lowered and the furnace top block A and the second stage block B are joined.
Further, the block joined body obtained by joining the furnace top block A and the second stage block B is lifted by the elevating devices 2a and 2b, and the third stage block C located at the lower stage is guided directly below the block joined body. The block assembly and the third stage block C are joined.
[0005]
Thus, as shown in FIG. 6, after sequentially lifting the block assembly located in the upper stage with the lifting devices 2a and 2b and guiding the block located in the lower stage (hereinafter referred to as the lower block) directly below the block assembly. Then, the block joined body is lowered, and the block joined body and the lower block are joined to construct a blast furnace. FIG. 6 shows an example in which a blast furnace is divided into five blocks for construction.
[0006]
In order to achieve a shortening of the construction period in constructing the blast furnace in this way, various techniques have been studied.
For example, Patent Document 1 discloses a short-term renovation / construction method for a blast furnace. This technique increases the roundness of each block and prevents breakage or collapse of refractory bricks caused by transportation or lifting, or damage or wear of attached equipment, thereby shortening the construction period. However, in the technique disclosed in Patent Document 1, no special consideration is given to the manufacture of the furnace bottom block, assuming that the round bottom block of the furnace bottom block to be joined last is small.
[0007]
As shown in FIG. 6, the furnace bottom block E is a block located at the lowest stage of the blast furnace, and is usually a block including a range from the lower part of the tuyere to the lowest part of the blast furnace including the furnace bottom brick. Therefore, the height of the furnace bottom block E reaches 14-15 m.
As shown in FIG. 1, the bottom layer portion of the furnace bottom block E has a complicated structure in which a refractory 8 and a cooling pipe 7 are disposed between the upper bottom plate 5 and the lower bottom plate 6, and anchor bolts 9 are provided. It has become. Therefore, the lowermost layer portion of the furnace bottom block E shown in FIG. 1 is the portion with the highest work load in the process of manufacturing the furnace bottom block E. FIG. 1 shows the vicinity (only one side) of the iron skin 4.
[0008]
The furnace bottom block E includes a furnace bottom cooling structure at the bottom of the blast furnace as shown in FIG. 2, and a furnace bottom brick 10 is stacked on the upper surface of the upper bottom plate 5 to construct a blast furnace bottom. In manufacturing the furnace bottom block E, the worker enters the furnace bottom block E, and arranges the upper bottom plate 5, the lower bottom plate 6, and the cooling pipe 7 which are the furnace bottom cooling structure, and the upper bottom plate 5 and the lower bottom plate E are arranged. It is necessary to perform an operation such as press-fitting the refractory 8 between the bottom plate 6 and the like. Therefore, the worker has to enter the furnace bottom block E beyond the iron shell having a height H of 14 to 15 m for these operations.
[0009]
In addition, it is necessary to carry the apparatus, tools and various materials used in the work into the furnace bottom block E. FIG. 2 shows the vicinity (only one side) of the iron skin 4.
When the worker enters the furnace bottom block E beyond the iron skin (height H = 14 to 15m), a ladder must be used, which not only lowers work efficiency but also improves safety. There is room for improvement from the viewpoint. Similarly, it is necessary to improve work efficiency and safety for carrying in devices, tools, and various materials.
[0010]
[Patent Document 1]
Japanese Patent No. 3165362 [Patent Document 2]
Japanese Patent No. 3157723 [0011]
[Problems to be solved by the invention]
An object of the present invention is to provide a blast furnace construction method that solves the above-described problems and enables shortening the construction period and improving safety of blast furnace construction.
[0012]
[Means for Solving the Problems]
In the present invention, the blast furnace is divided into two or more ring-shaped blocks from the top to the bottom of the furnace, and is manufactured at the ground assembly, and then the top block is lifted on the blast furnace foundation, and the second stage located at the lower stage. induced block directly below the furnace top block, after bonded to the second stage blocks is lowered the furnace top block, sequentially, to lift the block assembly located in the upper part on the blast furnace foundation, block the lower block In a blast furnace construction method in which a blast furnace is constructed by inducing directly below the joined body and lowering the block joined body to join the lower block to construct the blast furnace, the bottom floor block to be joined last includes the bottom bottom plate including the bottom bottom plate It consists block and above the hearth upper block of the furnace bottom subblock, the furnace shell of the furnace bottom subblock is 300~1500mm protrude above the upper base plate, distribution of cooling pipes between the upper base plate and the lower bottom plate Setting In addition , after making a furnace bottom lower block by press-filling with refractory, the bottom brick is constructed on the bottom bottom block with a diameter smaller than the inner diameter of the furnace bottom block without the surrounding iron shell. The furnace bottom upper block manufactured by incorporating the furnace cooling stave into the iron shell in advance at another assembly site is guided to the furnace bottom lower block. The refractory is press-fitted into the space between the iron skin and the side of the furnace bottom brick to form a furnace bottom block, and then the block assembly located in the upper stage is lifted on the blast furnace foundation, This is a blast furnace construction method in which a furnace bottom block is guided directly below a block joined body, and the block joined body is lowered and joined.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the furnace bottom block E is divided into two parts, a furnace bottom lower block and a furnace bottom upper block, which are individually manufactured at the assembly ground. FIG. 1 is a cross-sectional view schematically illustrating an example of a furnace bottom lower layer block.
As shown in FIG. 1, the bottom bottom block located at the bottom layer of the bottom block E projects slightly above the upper bottom plate 5, the lower bottom plate 6, the anchor bolt 9, and the upper bottom plate 5 by about 300 to 1500 mm. And the refractory 8 disposed between the upper bottom plate 5 and the lower bottom plate 6, the cooling pipe 7, and the refractory bricks (not shown) stacked on the upper surface of the upper bottom plate 5. The anchor bolt 9 may be located outside the iron shell 4. In the example shown in FIG. 1, the diameter of the furnace bottom block E is larger than that of the old furnace body. As a result, the anchor bolt 9 supporting the furnace body is An example in which the block E is located inside is shown.
[0014]
The height h of the bottom bottom block of the bottom bottom block E is about 1 to 1.5 m, and an operator can easily and safely enter the bottom bottom block E ₁ at the assembly site. Therefore, improvement in work efficiency and improvement in safety can be achieved. In addition, since the equipment, tools and various materials used for the work can be easily carried in, the furnace bottom lower layer block E ₁ having a large work load can be manufactured in a short period of time.
[0015]
On the other hand, of the furnace bottom block E shown in FIG. 2, the upper layer portion (hereinafter referred to as the furnace bottom upper block E ₂ ) excluding the furnace bottom lower block E ₁ is manufactured at another assembly site. It should be noted that the furnace bottom upper layer block E ₂ manufactured at the building site can be equipped with a furnace body cooling stave or the like that can be taken into the furnace in advance.
After the furnace bottom lower layer block E ₁ and the furnace bottom upper layer block E ₂ are individually manufactured in this way, the furnace bottom upper layer block E ₂ is joined onto the furnace bottom lower layer block E ₁ , and the furnace bottom block E and To do. Here, in joining the furnace bottom lower layer block E ₁ and the furnace bottom upper layer block E _2, it is necessary to join the iron skin 4 and the furnace bottom brick 10. In the present invention, the technology for joining the iron skin 4 and the furnace bottom brick 10 is because the inner structure that can be equipped in advance is incorporated in the furnace bottom lower block E ₁ and the furnace bottom upper block E ₂ . A method of joining by one-side welding from the outside is preferable, and a conventionally known technique such as disclosed in Patent Document 2 can be used.
[0016]
A construction example of the furnace bottom block E will be described with reference to FIGS.
FIG. 3 shows an example in which a furnace bottom brick 10 is installed in the furnace bottom block E. After the furnace bottom lower block E ₁ is manufactured as shown in FIG. 3 (a), the furnace bottom brick 10 is subsequently applied. It is constructed with dimensions smaller than the inner diameter of the furnace bottom block E. The bottom brick 10 constructed on the bottom bottom block E ₁ is a normal brick stacking operation, and has no workability because there is no surrounding iron skin 4. After the construction shown in FIG. 3 (a) is completed, the upper combination of the furnace bottom block E is entered.
[0017]
In FIG. 3 (b), the furnace bottom upper layer block E ₂ manufactured at another ground is combined to form a furnace bottom block E. Here, the iron skin 4 constituting the furnace bottom upper block E ₂ Is a refractory filled in the rear surface of the furnace body cooling stave 11, and 13 is a furnace body cooling stave 11. Shows cooling piping.
[0018]
The furnace bottom upper layer block E ₂ is joined onto the furnace bottom lower layer block E ₁ . The furnace bottom block E is completed by press-fitting a refractory into the space between the iron shell 4 and the side wall 14 of the furnace bottom brick 10 of the joined furnace bottom upper layer block E ₂ in FIG.
FIG. 4 shows another example of the furnace bottom block E. The furnace body cooling stave 11 is placed on the furnace bottom lower block E ₁ shown in FIG. bonding the hearth upper block E ₂ incorporating pre-cooling pipe 13 of the use staves 11. This was used as the furnace bottom block E, and the furnace bottom brick 10 was constructed in the furnace after the furnace bottom block E was used as a blast furnace furnace body and joined to other blocks to construct the blast furnace furnace body.
[0019]
Next, as shown in FIG. 6, the furnace bottom block E is placed on the moving device 3. On the other hand, the block joined body in which the furnace top block A to the block D are joined in advance is lifted, the furnace bottom block E is guided directly below the block joined body, the block joined body is lowered and joined to the furnace bottom block E, and the blast furnace. To build. When joining each block of the furnace top block A to the furnace bottom block E, a conventionally known technique can be used.
[0020]
Although FIG. 6 shows an example in which a blast furnace is constructed by dividing it into five blocks, the present invention can be applied when constructing a blast furnace by dividing it into two or more blocks, and the number of blocks is specified. It is not limited to the numerical value of.
In the present invention, the time required to manufacture the furnace bottom block E having a large work load can be shortened, so the construction period can be shortened and the construction cost can be reduced. Moreover, safety can be improved.
[0021]
【Example】
When renovating the blast furnace, it was divided into 5 blocks and disassembled, and built-in joints and other work were carried out at the assembly site to produce a block for assembling the furnace body. Next, after the furnace top block A was lifted and the second stage block B was guided directly below, the furnace top block A was lowered and joined to the second stage block B. The block C was joined in the same procedure, and further the block D was joined sequentially.
[0022]
When construction such as built-in joining of the furnace bottom block E is performed, the part from the lower surface of the lower bottom plate 6 to the height h = 1.5 m is divided from the furnace bottom block E as a bottom furnace bottom block as shown in FIG. Then, construction work such as built-in joints was done at the assembly ground. The other furnace bottom upper block E _{2, which} was obtained by dividing the furnace bottom lower block E ₁ from the furnace bottom block E, was constructed at a building site different from the furnace bottom lower block E ₁ .
[0023]
In this way, the furnace bottom block E ₁ and the furnace bottom block E ₂ , which were individually manufactured, were joined together to manufacture the furnace bottom block E.
Next, as shown in FIG. 6, the furnace bottom block E is placed on the moving device 3. On the other hand, the block joined body in which the furnace top block A to the block D are joined in advance is lifted, the furnace bottom block E is guided directly below the block joined body, the block joined body is lowered and joined to the furnace bottom block E, and the blast furnace. Was built. This is an invention example.
[0024]
On the other hand, the past results when the same blast furnace is divided into five blocks in the same manner and the furnace bottom block E is divided into two are used as conventional examples.
When the construction period required for the construction of the blast furnace was compared between the inventive example and the comparative example, the inventive example was shortened by 3 days. In addition, in the example of the invention, the safety of the manufacturing work of the furnace bottom block E is improved.
[0025]
【The invention's effect】
According to the present invention, it is possible to shorten the construction period of blast furnace construction and improve safety.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing an example of a furnace bottom lower layer block.
FIG. 2 is a cross-sectional view schematically showing an example of a furnace bottom block.
FIG. 3 is a cross-sectional view schematically showing an example of constructing a furnace bottom brick in the furnace bottom block.
FIG. 4 is a cross-sectional view schematically showing another example of a furnace bottom block.
FIG. 5 is a cross-sectional view schematically showing a state where a furnace top block is suspended.
FIG. 6 is a cross-sectional view schematically showing a state where a block joined body is lifted.
[Explanation of symbols]
1 Furnace column
2a Lifting device
2b Lifting device 3 Moving device 4 Iron skin 5 Upper bottom plate 6 Lower bottom plate 7 Cooling piping 8 Refractory 9 Anchor bolt
10 Furnace bottom brick
11 Furnace cooling stave
12 Refractories
13 Cooling piping
14 Side H Height of bottom block h Height of bottom floor block

Claims (1)

The blast furnace is divided into two or more ring-shaped blocks from the top of the furnace to the bottom of the furnace and manufactured on the ground, and then the top block is lifted on the blast furnace foundation, and the second stage block located at the lower stage is After directing directly below the top block and lowering the furnace top block to join the second stage block, the block assembly located in the upper stage is sequentially lifted on the blast furnace foundation, and the lower block is moved to the block. In a blast furnace construction method in which a blast furnace is constructed by directing directly below a joined body and lowering the block joined body and joining the lower block to construct a blast furnace, the furnace bottom block to be joined last includes a furnace including a lower bottom plate to an upper bottom plate. made from the bottom lower block and an upper hearth upper block of the furnace bottom lower block, to 300~1500mm protrude furnace shell of the furnace bottom subblock above the upper base plate, the upper base plate and the front And disposing the cooling pipes between the serial lower base plate, after further refractory was pressed filled manufactured the furnace bottom lower block, the inner diameter of the bottom portion of the furnace blocks furnace bottom bricks with no steel shell surrounding the periphery Build on the bottom floor block with a smaller diameter, and build the top floor block on the bottom floor block, which is manufactured by incorporating a furnace cooling stave into the iron shell in advance at another assembly site. Induction, joining the core of the bottom furnace block and the core of the top furnace block, press-filling a refractory into the space between the core and the side of the bottom brick, the bottom of the furnace The block joined body is then lifted on the blast furnace foundation, and the furnace bottom block is guided directly below the block joined body, and the block joined body is lowered and joined. How to construct a blast furnace.

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