WO2010027066A1

WO2010027066A1 - Blast furnace bottom dismantlement method and transport device

Info

Publication number: WO2010027066A1
Application number: PCT/JP2009/065554
Authority: WO
Inventors: 竹下博喜; 高崎洋
Original assignee: 新日本製鐵株式会社; 新日鉄エンジニアリング株式会社
Priority date: 2008-09-03
Filing date: 2009-09-01
Publication date: 2010-03-11
Also published as: KR101212247B1; BRPI0915183B1; KR20100135902A; JP5216491B2; CN102224262B; BRPI0915183A2; CN102224262A; JP2010059482A

Abstract

Disclosed are a blast furnace bottom dismantlement method and a transport device with which furnace bottom blocks can be transported after furnace blow-out without water injection cooling. The method is a furnace bottom dismantlement method whereby the furnace bottom blocks are separated from a furnace that is installed at the installation site and the separated furnace bottom blocks are transported from the installation site, and which includes a separation step wherein the furnace bottom blocks are separated from the furnace body without injecting cooling water into the furnace body, and a removal step wherein the separated furnace bottom blocks are removed from the installation site while being cooled.

Description

Method of dismantling blast furnace bottom and conveying device

The present invention relates to a blast furnace bottom disassembly method and a transport device, and relates to the removal of a bottom block at the time of renewal or dismantling of a blast furnace, in particular, only the bottom block is renewed and the bottom block when reusing an upper furnace body The present invention relates to a method and apparatus suitable for unloading.

Renovation of the blast furnace involves a lot of construction work such as dismantling the furnace body and building a refractory inside the furnace, which increases the construction period. During the blast furnace renovation period, pig iron production by the blast furnace is reduced or stopped, so there is a strong demand for shortening the refurbishment period.
As a technique for shortening the construction period, a large block construction method has been developed (see Patent Document 1). In Patent Document 1, a furnace body of a blast furnace to be repaired is divided into a plurality of ring blocks, and each block is sequentially taken out to a work site for dismantling and disassembled. On the other hand, each block of the furnace body is assembled in advance at another assembly work site, and each block is sequentially carried to the installation position of the blast furnace. Then, each block is suspended on the installation site by, for example, a lift-up method, and sequentially joined onto the furnace bottom block on the foundation, and the whole is integrated to construct a blast furnace body.
In Patent Literature 1, a dedicated furnace body transport carriage (dolly) is used for carrying out and carrying in a plurality of ring blocks constituting each part of the furnace body.
In the renovation of the conventional blast furnace, all the furnace bodies of the blast furnace were replaced with new ones. For this reason, the division and removal of the blast furnace body to be refurbished, the dismantling / removal of the blast furnace ancillary equipment such as the annular pipe, and the import / installation of each block of the blast furnace body and the ancillary equipment have become major.
Here, the shaft life of the blast furnace can be extended to more than 15 years due to improvements in cooling staves, refractories, etc., and advances in repair technology through reduced scale operation. However, the lifetime of the bottom of the furnace is still technically limited to about 15 years.
On the other hand, for the purpose of extending the life of the blast furnace, a technique has been proposed in which only the bottom of the blast furnace is refurbished (see Patent Document 2).
In Patent Document 2, among the blast furnace bodies to be refurbished, at least the furnace bottom portion is separated from the furnace body, and the separated old furnace bottom block is moved and removed from the blast furnace installation site and assembled at another work site. The new furnace bottom block is carried into the installation site, and the furnace body is updated by replacing the old furnace bottom block.
In Patent Document 2, when a furnace bottom block is carried out or carried in, a fluid orbiting device (air caster) that floats by forming a moving film from the blast furnace foundation at the installation site to the outside and forming a fluid film thereon. A system in which the furnace bottom block is levitated and conveyed by the fluid levitation apparatus is used.

JP-A-9-143521 JP-A-5-222420

By the way, in the above-described conveyance by the dolly or the levitation conveyance by the fluid levitation apparatus, the ring blocks that can be conveyed structurally are limited to 4000 tons.
However, among the ring blocks obtained by dividing the furnace body, the furnace bottom block when the furnace body is dismantled is particularly heavy and may exceed 4000 tons. This is because, when dismantling, the hot metal that was in the furnace at the time of blowing was cooled and solidified and deposited on the furnace bottom as residue and other residues (slag and coke).
Work to remove residues, firewood, coke, etc. remaining in the furnace bottom, stave coolers, refractory bricks, etc. installed in the furnace before loading, in response to such an excess weight of the furnace bottom block To reduce the weight.
Such weight reduction work is carried out before carrying out at the blast furnace installation site, so it is not suitable for the purpose of the furnace ring large block method to reduce the work process at the installation site. This is an obstacle to shortening the construction period.
In response to such a problem, the present applicant has proposed a transport apparatus and a transport method capable of transporting a furnace bottom block of 4000 tons or more (Japanese Patent Application No. 2007-207734, Japanese Patent Application No. 2008-196528, etc.).
This proposed technology installs a transport path using steel plates between the blast furnace installation site and the work site where each ring block is assembled and disassembled, and then uses a high load bearing sliding means on it. A transfer stand was installed, which enabled the transfer of furnace bottom blocks of about 8000 tons. By extending the transport weight limit by this technology, it is possible to expand the pre-assembly of the bottom of the furnace block, greatly simplify the removal of the bottom of the furnace bottom at the time of dismantling, and shorten the repair period.
With the improvement of such transport technology, the processing of the furnace bottom at the time of furnace body dismantling is simplified. However, in the blast furnace refurbishment technology, further improvement is desired for shortening the above-mentioned construction period, and another problem has become apparent in the treatment of the bottom of the furnace when dismantling the furnace body.
That is, in the dismantling of the furnace body by the large block method described above, the scaled-down operation that gradually reduces the furnace interior entry is performed, and when the furnace interior entry is lowered to the tuyere level, water injection cooling into the furnace body is performed, The furnace body is cut after the furnace temperature is lowered by this water injection cooling.
Water injection cooling is performed by spraying water into the furnace after blowing off the blast furnace, spraying cooling water on the coke and hot metal remaining in the bottom of the furnace, suppressing combustion of red hot coke, and reducing the amount of generated gas generated. At the same time, the temperature of the remaining coke and hot metal is lowered to such an extent that it can be discharged outside the furnace.
In order to perform such water injection cooling, the blast furnace at the time of blow-off requires water injection equipment that can inject a large amount of water into the bottom of the furnace and remove gas components generated from coke and hot metal in the furnace. Gas treatment equipment that performs the filtration treatment when draining the cooling water in the furnace is required. In addition to such equipment costs, work time is required for water injection or cooling, which hinders shortening of the repair period.
Furthermore, there is a possibility of a steam explosion when water injection cooling is performed on high-temperature coke and hot metal, and safety management is necessary. In addition, sufficient countermeasures are taken for the generation of gas components, hot water, and the above. It was necessary to eliminate the cooling of the water injection.
On the basis of such a request, elimination of water injection cooling has been studied, but the inside of the furnace after the blow-off remains at a very high temperature, and it has been difficult to carry out the furnace bottom as it is. In particular, during normal operation of the blast furnace, the cooling of the furnace body is continued by a cooling stave installed in the furnace, and the furnace body is maintained by this cooling.
However, when the refrigerant pipe is removed along with the cutting of the furnace body and the cooling by the stave is stopped, the temperature of the furnace body rises due to the high temperature residue remaining in the furnace without being injected and cooled, and the deformation of the iron skin There was concern about undesirable effects such as
A main object of the present invention is to provide a method for dismantling a blast furnace furnace bottom portion and a transfer device that can carry out a furnace bottom block without performing water injection cooling after blowing.

The present invention is a method for disassembling a blast furnace furnace bottom part in which a furnace bottom block is separated from a furnace body installed at an installation site, and the separated furnace bottom block is carried out from the installation site, and does not cool by pouring water into the furnace body A separation step of separating the furnace bottom block from the furnace body in a state; and a carrying-out step of carrying out the separation from the installation site while cooling the separated furnace bottom block. In the present invention as described above, the conventional problem caused by the water injection cooling can be solved by not performing the water injection cooling into the furnace body in the separation process, and the furnace bottom block is carried out while cooling in the carrying out process. An increase in the temperature of the bottom block can be suppressed, and unnecessary effects can be avoided.
In the disassembling method according to the present invention, it is desirable to use a carrier for placing the furnace bottom block in the carrying-out process. In the present invention, by using the transportation platform, the bottom block can be transferred from the blast furnace foundation to the transportation platform, and the transportation platform can be transported to the dismantling work site by towing or the like. .
At this time, the conveyance path of the conveyance platform is made of a steel plate with high load resistance, etc., and sliding means (for example, stainless steel plate and steel plate) that can reduce the friction coefficient with high load resistance between the conveyance path and the conveyance platform. Etc.), for example, the furnace block can reach about 8000 tons (see Japanese Patent Application Nos. 2007-207734 and 2008-196528 by the applicant mentioned above). Alternatively, an existing dolly or an air caster may be used as long as it can withstand a similar load.
In the disassembling method of the present invention, it is desirable that the furnace bottom block is cooled in the unloading step by using a cooling device installed on the transportation platform. In the present invention as described above, the cooling device can be moved integrally even if the transportation platform moves along with the transportation, and the complication of the cooling device can be avoided. In particular, since the cooling device and the furnace bottom block coexist on the same transportation platform, the refrigerant piping and the like can be minimized.
In the disassembling method of the present invention, the separation step is a cooling in which piping connected to the cooling stave of the furnace bottom block is switched from a cooling device installed at the installation site to a cooling device installed on the transportation platform. A system switching step, and during normal operation, the refrigerant is circulated from the cooling device installed at the installation site to the stave, and in the unloading step, the cooling device installed on the transportation platform is transferred to the stave. It is desirable to circulate the refrigerant. In the present invention, by performing the cooling system switching step in the separation step, the pipe connected to the cooling stave of the furnace bottom block is installed on the transportation platform from the cooling device installed on the installation site. Switch to cooling device.
As a result, during normal operation or until the blow-off, the refrigerant is circulated from the cooling device installed at the installation site to the stave, and an expected cooling function is obtained in the portion corresponding to the furnace bottom block before separation. .
In addition, when separating or carrying out the bottom block after blowing, the coolant is circulated from the cooling device installed on the carrier to the stave, and the desired cooling function is obtained in the separated bottom block.
Therefore, in the separation process or the unloading process, it is possible to ensure the cooling performance required for the furnace bottom block regardless of whether the furnace bottom block is separated or after the separation.
Further, in any state before and after separation, the stave pre-installed in the furnace bottom block can be shared as the heat absorption means in the furnace bottom block, so there is no need to install a separate heat absorption means for carrying out. The equipment cost can be reduced and the work period can be shortened.
It should be noted that the cooling capacity of the cooling device installed on the transportation platform may be smaller than that of the cooling device installed at the installation site. This is because, in addition to cooling of the bottom block to be carried out, in the bottom block to be carried out, the combustion state is greatly suppressed and the calorific value is suppressed as compared with the normal operation.
About the upper furnace body isolate | separated from a furnace bottom block, this may be maintained as integral and may be further isolate | separated into a some ring block. When renewing only the furnace bottom block and reusing the upper furnace body, the upper furnace body may be maintained as a single unit. When the upper furnace body is also renewed, the upper furnace body is further divided into a plurality of ring blocks. It can be separated and carried out sequentially.
In the dismantling method of the present invention, it is desirable to have an upper furnace body supporting step of supporting the upper furnace body separated from the furnace bottom block on the blast furnace pit in the operating position before the separating step. In the present invention as described above, the upper furnace body separated from the furnace bottom block can be maintained as a single unit by supporting it on the blast furnace. For this reason, when only the furnace bottom block is updated and the upper furnace body is reused, the blast furnace is reconstructed by reconnecting the upper furnace body that has been maintained and the updated furnace block again. be able to. Further, by supporting the upper furnace body without moving it from the position at the time of operation, it is not necessary to remove piping around the furnace body at the time of separation, and it can be used as it is at the time of reconstruction.
In order to support the upper furnace body separated from the furnace bottom block to the blast furnace furnace while maintaining the position at the time of operation, there is a method of forming an auxiliary support structure between the furnace body and the furnace body iron at the time of operation. Can be adopted. As such a support structure, a ring girder or the like installed in an existing furnace body can be used.
In the disassembling method of the present invention, the separation step includes a cutting step for forming a cutting region over the entire circumference in the furnace body of the blast furnace, and the cutting region has an upper edge height of the annular tube of the blast furnace. It is desirable that the height of the upper joint of the staves immediately below is the upper joint height of another stave located at a position lower than the upper joint of the stave whose upper edge is the upper edge height. In the present invention, the excision step forms an excision region over the entire circumference in the furnace body of the blast furnace, thereby separating the furnace bottom block and the upper furnace body thereon.
Here, the upper edge height of the excision region is the height of the upper joint of the stave located immediately below the annular tube of the blast furnace. The upper edge of the cutting area is separated and corresponds to the upper end of the furnace bottom block when being pulled out from the foundation in the horizontal direction by the drawing device. If the furnace bottom block is pulled out horizontally with the annular tube maintained in the upper furnace body or furnace body, the upper end of the furnace bottom block needs to be lower than the annular tube. Therefore, it is desirable that the upper edge height of the ablation region be lower than the blast furnace annular tube. On the other hand, in order to cut the furnace body, it is desirable to avoid the stave installed on the inner wall. Based on such conditions, in the present invention, the height of the upper edge of the excision region is set to the height of the upper joint of the stave located immediately below the annular pipe of the blast furnace.
Further, the lower edge height of the excision region is set to the upper joint height of another stave located at a position lower than the upper joint of the stave, which is the above-described upper edge height. This is a construction condition in accordance with the above-described cutting of the furnace body. For example, the excision region may be one stave or may be an excision region extending over two or more stave heights.
By such a cutting region, a gap having a height of at least one stave is formed between the separated upper furnace body and the furnace bottom block. Therefore, even when the furnace bottom block is displaced vertically when the furnace bottom block is pulled out in the horizontal direction, it is possible to avoid contact or interference between the furnace bottom block and the upper furnace body.
Further, in the upper furnace body, since the excision area is cutting at the joints of the stave, the remaining stave can be reused as it is. Therefore, it is effective when adopting a procedure in which only the furnace bottom block is updated and the upper furnace body is reused.
In the dismantling method of the present invention, the separation step includes a covering step of covering the surface of the red hot contents remaining in the furnace bottom block with a covering material and blocking the contents from the outside air. desirable. In the present invention, by covering the surface of the red-hot contents of the furnace bottom block by the coating process, heat from the coke, hot metal, and hot metal, which are the red hot contents, can be shielded. It is possible to prevent the combustible gas generated from the gas from being released to the atmosphere as it is, and to prevent excessive combustion in the furnace due to the entry of outside air containing oxygen.
As such a covering material, an inorganic material such as a so-called castable, cement, or mortar that can be solidified after being applied in a liquid form to form a coating film or a covering material layer can be used. Since the coating material is used in a high-temperature furnace, it is desirable that the coating material has high heat resistance, and it is also desirable that the gas shielding performance be high.
In the dismantling method of the present invention, the separation step forms an opening in the furnace body of the furnace bottom block prior to the covering step, introduces a part of heavy equipment from the opening, and the furnace bottom block is introduced by the heavy equipment. It is desirable to have a leveling step of leveling the surface of the red hot contents remaining inside.
In the present invention as described above, it is possible to easily and reliably form the covering material by performing the leveling step prior to the covering step. It is desirable that a heavy machine to be introduced into the furnace has a long work machine such as a power shovel so that the heavy machine main body and the operator can work without entering the furnace.
The opening to be formed in the furnace body only needs to be able to introduce the work machine portion of the excavator, and may be formed so as to overlap the above-described excision region, and may be used as the excision region thereafter.
In the disassembling method of the present invention, the separation step induces combustible gas generated from the red-hot contents remaining in the furnace bottom block covered with the coating material to the outside, burns it, and then dissipates it to the atmosphere. It is desirable to have a combustible gas discharge process. In the present invention, in order to dissipate the combustible gas generated from the red hot contents remaining in the furnace bottom block to the outside through the combustible gas discharge step, Safety inside and outside the block can be increased.
In the disassembling method of the present invention, it is desirable that the covering step includes an inert gas filling step of filling the contents of the red hot state covered with the covering material with an inert gas.
In the present invention, the inert gas filling step fills the inside of the red-hot contents with an inert gas to cut off the oxygen supply to the coke and the like inside the red-hot contents. Combustion reaction can be suppressed. As the inert gas, an appropriate gas other than nitrogen gas can be used.
The present invention relates to a blast furnace bottom transfer device used for separating a furnace bottom block from a furnace body installed at an installation site, and carrying out the separated furnace bottom block from the installation site, It has a transfer stand having a mounting surface on which the block is placed, and a cooling device installed on the transfer stand to circulate the refrigerant with respect to the cooling stave in the furnace bottom block. In the present invention as described above, it is possible to obtain the same effects as those of the dismantling method of the present invention described above. In other words, the conventional problem caused by the water injection cooling can be solved by not cooling the water into the furnace body in the separation process, and the furnace bottom block temperature is increased even without the water injection cooling because the furnace bottom block is carried out while cooling in the carrying out process. Can be suppressed, and unnecessary influences can be avoided.
In the transport apparatus according to the present invention, the cooling device includes a refrigerant pipe connected to the cooling stave, a pump that circulates the refrigerant in the refrigerant pipe, and a radiator that radiates heat of the refrigerant circulating in the refrigerant pipe. It is desirable to have. In the present invention, a reliable cooling function can be realized by using the stave of the furnace bottom block by the cooling device for circulating the refrigerant.
In the transfer device of the present invention, the opening opened to the atmosphere on the upper end side of the cooling stave, the refrigerant pipe connected to the lower end side of the cooling stave, the lower end side connected to the refrigerant pipe, and the upper end side opened to the atmosphere It is desirable to have a water supply pipe. In the present invention as described above, the refrigerant is evaporated by evaporating the refrigerant at the opening on the upper end side of the cooling staves, so that the cooling function of the staves of the furnace bottom block can be secured, and the refrigerant is reduced by evaporation. Since the minute amount is supplied through the supply pipe, the cooling function can be realized with a simple configuration without using a pump or the like.

FIG. 1 is a side view showing a blast furnace and a transfer apparatus according to an embodiment of the present invention.
FIG. 2 is a work block diagram showing a blast furnace refurbishment procedure in the embodiment of FIG.
FIG. 3 is an enlarged cross-sectional view showing a furnace body support and excision region in the embodiment of FIG.
FIG. 4 is a cross-sectional view showing a leveling process in the embodiment of FIG.
FIG. 5 is a cross-sectional view showing the unloading process in the embodiment of FIG.
FIG. 6 is a cross-sectional view showing the transfer platform and the cooling device in the embodiment of FIG.
FIG. 7 is a cross-sectional view showing a transfer platform and a cooling device according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a blast furnace 1 to which the present invention is applied is installed on the ground of an installation site 2. The blast furnace 1 includes a foundation 3 installed on the ground, a furnace body 4 constructed on the foundation 3, and a furnace body cage 5 constructed around the furnace body 4. The furnace body 4 is a cylindrical structure formed by extending a refractory material 42 such as a refractory brick and a cooling stave 43 inside an iron skin 41. A charge 44 such as coke or iron ore is charged into the furnace body 4 from the top of the tower, and hot air is blown from the lower tuyere 45. As a result, coke burns and generates heat in the furnace body 4, and a reducing gas CO is generated. The iron ore is reduced and melted by the reducing gas while being heated, and hot metal 46 is generated at the bottom of the furnace. The hot metal 46 and the charged material 44 remain as red hot contents 47 when the furnace bottom block 7 described later is carried out.
A cooling device is connected to the stave 43 of the furnace body 4 via a refrigerant pipe (not shown). The cooling device includes a radiator and a pump installed outside the furnace body 4 and the furnace body shed 5, circulates a refrigerant (water is used in the present embodiment) through the stave 43, and the refrigerant that has absorbed heat at the stave 43 is Cool with a radiator. A large number of staves 43 installed in the furnace body 4 are grouped into sections such as a furnace top, a furnace chest, a furnace belly, and a furnace bottom, and the cooling state can be finely adjusted for each group.
The furnace body 5 has, for example, four pillars surrounding the furnace body 4 as a basic structure, and holds an annular beam material and a scaffold (not shown) surrounding the furnace body 4 at each height. An annular tube 51 that supplies air heated to the tuyere 45 is installed above the tuyere 45 near the tuyere 45, and is connected to the tuyere 45 by a connecting pipe 52.
The furnace body 5 is provided with a support portion 53 for supporting the furnace body 4. As will be described later, when the furnace bottom block is carried out, a support member 4 A is formed on the furnace body 4 and connected to the support portion 53. By doing so, the upper furnace body 6 separated from the furnace bottom block 7 can be supported in a state of being floated on the foundation 3.
In the present embodiment, the furnace bottom portion of the furnace body 4 is divided from the upper furnace body 6 and carried out as a furnace bottom block 7. After carrying out the furnace bottom block 7, the renewed furnace bottom block 7 A is carried in and connected to the upper furnace body 6 again. Thereby, only the furnace bottom block 7 is replaced, the upper furnace body 6 can be reused, and the furnace body 4 can be efficiently repaired.
On the ground away from the installation site 2, a work site 8 is set in which the separated furnace bottom block 7 is disassembled or a renewed furnace bottom block 7A is manufactured in advance.
A transfer device 10 is installed between the work site 8 and the installation site 2 for repair work.
The transfer device 10 includes a transfer path 11 extending from the installation site 2 to the outer periphery of the foundation 3 of the work site 8, and a transfer platform 12 that can move on the transfer path 11 by placing the furnace bottom blocks 7 and 7 A. A lower sliding means 13 that can slide on the transportation path 11 while supporting a high load is installed on the lower surface of the transportation platform 12. On the upper surface of the carrier base 12, an upper sliding means 14 (drawer) for horizontally pulling out the furnace bottom blocks 7 and 7A and transferring them to the upper surface of the carrier base 12 is installed.
The lower sliding means 13 is composed of metal plates that slide on each other, and a combination of a steel plate and a stainless steel plate can be used as a configuration that can reduce frictional resistance while receiving a high load. Specifically, it is possible to use a configuration in which a stainless steel plate is installed on the lower surface of the carrier 12 and the upper surface of the conveyance path 11 is a steel plate, and these are in sliding contact with each other. Not only the combination of a steel plate and a stainless steel plate, but also a combination of steel plates or a combination of other metal plates may be used. The lower sliding means 13 is not limited to two metal plates that slide on each other, and one of them may be a rail-like long material. Further, the lower sliding means 13 may be one using wheels (existing chill tank) as long as the load burden can be tolerated. The transport platform 12 that is in sliding contact with the transport path 11 via the lower sliding means 13 can be moved on the transport path 11 by being pulled by a driving device (such as a winch) (not shown). The transport platform 12 is not limited to the pulling type as described above, and may be a self-propelled cart (such as an existing dolly) as long as the load burden can be tolerated.
As for the upper sliding means 14 (drawing device), the same configuration as that of the lower sliding means 13 described above can be used, and an existing floating conveying means (such as an air caster) may be used. In the case of using such an air caster, it is desirable to form an air gap that can be introduced into the bottom surface of the furnace bottom blocks 7 and 7A and can be supported when the air caster is lifted. .
In order to repair the blast furnace 1 as described above, a technique for updating the furnace bottom blocks 7, 7A using the work site 8 and the transfer device 10 has already been proposed by the present applicant (Japanese Patent Application No. 2007-). 207734, Japanese Patent Application No. 2008-196528, etc.).
Here, in the conventional blast furnace refurbishment technique, water injection and cooling into the furnace body 4 is performed prior to the separation of the furnace bottom block 7. On the other hand, in this embodiment, the water injection cooling into the furnace body 4 is not performed, and the furnace bottom portion is carried out in a hot state.
FIG. 2 shows a blast furnace repair procedure in the present embodiment.
In the blast furnace refurbishment procedure of the present embodiment, the operation enters the reduced operation S1 from the normal operation state, undergoes the separation step S4 and the unloading step S5 without water injection cooling according to the present invention, through the preparation step S2 and the blow-stop S3, Further, through a reconstruction step S6, a trial operation S7 is performed, and the normal operation state is restored.
The reduction operation S1 is performed in order to reduce as much as possible the red hot contents 47 remaining in the blast furnace 1 in the normal operation state. In a normal operation state, the blast furnace 1 is charged with the entire charge 44, and its surface 44A is located near the top of the furnace. On the other hand, by continuing the operation in a state where the charging amount is reduced, the charged material 44 is reduced and the surface thereof is lowered to the surface 44B at a level below the annular pipe 51.
In the preparation step S2, items necessary for separating the furnace bottom block are preceded by items that can be implemented before blowing off, thereby shortening the work period. For this purpose, the preparatory process S2 includes an upper furnace body support process S21 performed in the furnace body 4 and a foundation cutting process S22 performed in the furnace bottom (the lower part of the furnace body 4 or the portion serving as the furnace bottom block 7 of the foundation 3). And a drawing device installation step S23, a transfer route setting step S24 and a transfer gantry setting step S25 performed in the transfer device 10, a furnace body cooling pipe refurbishing step S26 and a gantry cooling device setting step S27 performed in or around the furnace body 4. including.
In the upper furnace body support step S21, the support member 4A is formed on the furnace body 4 and connected to the support portion 53, so that the furnace body 4 (the upper furnace body 6 other than the portion separated as the furnace bottom block 7 should be formed). Part) is supported on the furnace body 5 (see FIGS. 1 and 3). By such an upper furnace body support step S21, the upper furnace body 6 can maintain the position of the operation state even during the replacement work of the furnace bottom blocks 7 and 7A, and it is necessary to release the connection of peripheral devices and the like. Absent.
The upper furnace body support step S21 may be performed before the cutting of the furnace body 4 (furnace entire body cutting step S42 described later), but is suitable for the relaxation of the separation step S4 by being performed before the blowing stop S3. is there.
The basic cutting step S 22 is a step of forming a horizontal cut surface on the base 3. In cutting the foundation 3, for example, a method of setting a plurality of strip-like sections in the planar shape of the foundation 3 and sequentially performing horizontal cutting of each section using a wire saw can be employed. A gap having a predetermined height is formed in the foundation 3 as a result of the horizontal cutting, and it is desirable that the gap is sequentially filled with a load supporting member such as a high pack anchor to temporarily fill the gap. The bottom cut side of the furnace bottom block 7 is cut by such a basic cutting step S22, and the cut of the upper end side is similarly cut by the furnace body full circumference cutting step S44 described later, so that the furnace bottom block 7 has the furnace body 4 cut. It becomes separable from.
Since the basic cutting step S22 does not directly affect the operation in the furnace body 4, it is carried out before the blowing stop S3.
The drawer installation step S23 is performed following or in parallel with the basic cutting step S22. In the drawing device installation step S23, the drawing device (upper sliding means 14) is arranged on the lower surface of the furnace bottom block 7 cut in the basic cutting step S22. When an air caster is used as the drawing device, it is necessary to form a gap portion that can be introduced into the bottom surface of the furnace bottom blocks 7 and 7A and can be supported when the air caster is lifted. It is desirable to construct such a void at the same time as the above-described void refilling in the basic cutting step S22. If such a gap portion is formed, an air caster may be disposed on the transportation platform 12 and aligned so as to enter the aforementioned gap portion.
The transfer route setting step S24 is a step of setting the transfer route 11 of the transfer device 10 described above. The conveyance path 11 is continuously installed from the vicinity of the outer periphery of the foundation 3 of the installation site 2 to the work site 8. Prior to the installation of the transport path 11, depending on the ground to be installed, reinforcement or the like is also performed.
In the transfer gantry installation step S25, the transfer gantry 12 is installed at any position on the transfer route 11 after or during the transfer route setting step S24. At this time, the transportation platform 12 may be constructed on the transportation route 11 extending to the work site 8, or the transportation platform 12 may be constructed at another place and transferred onto the transportation route 11.
The furnace body cooling pipe refurbishment step S26 is a process for preparing to switch a part of the cooling pipe connected to the stave 43 of the furnace body 4. Specifically, the stave 43 in the section other than the furnace bottom is kept connected to the cooling device of the blast furnace 1 as it is, and the cooling by the cooling device is maintained. On the other hand, the stave 43 at the bottom of the furnace will be refurbished so that a switching valve and a bypass path are sequentially added for each group so that the refrigerant can be circulated with another cooling device.
The gantry cooling device installation step S27 is a step of installing a dedicated cooling device on the transfer gantry 12. The cooling device on the transportation platform 12 circulates the refrigerant to the stave 43 inside when the bottom block 7 is carried out, and the cooling capacity may be significantly smaller than the cooling device of the blast furnace 1. .
FIG. 6 shows a specific example of the stave 43 and the cooling device 20 in the furnace bottom block 7 transported by the transport stand 12.
In FIG. 6, a large number of staves 43 are arranged inside the furnace bottom block 7, and a group is constituted by a series of staves 43 that are continuous in the vertical direction. The cooling device of the blast furnace 1 is connected to the lowermost refrigerant introduction portion 43B and the uppermost refrigerant extraction portion 43T of this group during normal operation, but when the furnace bottom block 7 is carried out, The cooling device 20 is switched.
The cooling device 20 includes a radiator 21, a refrigerant pipe 22 that connects the radiator 21 and the refrigerant introduction part 43 B, a refrigerant pipe 23 that connects the radiator 21 and the refrigerant take-out part 43 T, and a pump installed at any part of the

refrigerant pipes

22 and 23. 24. By using such a cooling device 20, the furnace bottom block 7 is transported by the transport stand 12 and can maintain a cooling function during transport.
The furnace bottom block 7 is cooled from the cooling device 20 at the time of conveyance after the cooling system switching step S47 described later, and until that time, the cooling by the cooling device of the blast furnace 1 is maintained. .
Through the above steps, the preparatory step S2 before the blow stop S3 is performed.
Among these processes, the upper furnace body support process S21, the furnace body cooling pipe refurbishment process S26, and the gantry cooling device installation process S27 can be performed in a relatively short period of time. However, since the basic cutting step S22, the drawing device installation step S23, the transfer route installation step S24, and the transfer gantry installation step S25 are relatively large-scale construction, it is necessary to start at a time substantially before the blow stop S3. There is. In such a case, it is desirable that the above-described reduction operation S1 is performed in parallel with the preparation step S2, and is adjusted so that each completion time coincides with the scheduled start time of the blow-stop S3.
After the preparatory step S2 as described above, the blowing stop S3 is performed. And after blowing stop S3, separation process S4 is implemented without water injection cooling.
The separation step S4 includes a furnace body opening step S41 and a furnace body full circumference cutting step S44 performed in the furnace body 4, a contents surface leveling process S42 performed in the furnace bottom (furnace bottom block 7 portion), and the contents surface It includes a covering step S43, a combustible gas discharging step S45 and an inert gas filling step S46, and a cooling system switching step S47 related to the cooling system.
The furnace body opening step S41 is a step of securing a work opening in the furnace body 4 in advance in order to enable in-furnace work from outside the furnace in the contents surface leveling step S42.
In the contents surface leveling step S42, a part of heavy equipment is introduced from the opening for work previously formed in the furnace body opening step S41, and the surface of the red hot content remaining in the furnace bottom block 7 is removed by this heavy equipment. It is a leveling process.
The content surface coating step S43 is a step of coating the surface of the red hot content leveled in the content surface leveling step S42 previously with a coating material.
Specific operations in the steps S41, S42, and S43 are as follows.
In the furnace body opening step S41, a plurality of work openings 4C are formed in the furnace body 4 as shown in FIGS.
The work opening 4C is within the range of a resection area 4B (described in detail in the section of the furnace body full resection step S44) described later (between the upper end level L1 and the lower end level L2 shown in FIGS. 3 and 4). It is intermittently arranged in the circumferential direction of the body 4. In processing the working opening 4C, one or a plurality of sections of the stave 43A corresponding to the cut region 4B are set, and the iron skin 41 corresponding to the section is cut over the entire circumference, and the inner stave 43A is cut. And the refractory material 42A is removed.
In the content surface leveling step S42, as shown in FIG. 4, a heavy machine 61 such as a power shovel is disposed, and an excavator portion 62, which is a work machine portion thereof, is introduced into the furnace body 4 from the work opening 4C and reduced. The surface 44B of the contents 47 in the red hot state descended in the shaku operation S1 is leveled to obtain a surface 44C. A part of the red hot contents 47 may be carried out of the furnace, for example, when the surface 44B is high. Such leveling work is limited to the surface 44B in a range that can be reached from the work opening 4C, but by sequentially performing each work opening 4C, the entire surface in the furnace is substantially leveled to form the surface 44C. The The surface 44C is desirably lower than the upper end level L1 over the entire surface.
In the content surface coating step S43, a coating material is applied to the leveled surface 44C shown in FIG. 4 to form a coating of the coating material 44D as shown in FIG. As the coating material 44D, an inorganic material such as so-called castable, cement, or mortar that can be applied in liquid form and solidified to form a coating or coating material layer can be used. Since it is used in a high-temperature furnace, it is desirable that the heat resistance is high, and it is desirable that the gas blocking performance is also high.
In forming such a covering material 44D, a method of introducing a hose or the like from the above-described working opening 4C, pumping from the outside, and spraying on the surface 44C can be used.
By covering the surface of the red hot content 47 with such a coating material 44D, the red hot content 47 itself can be prevented from scattering and the gas generated from the red hot content 47 into the atmosphere can be avoided. The dissipation can be prevented, and the dissipation of heat generated from the hot red contents 47 can also be suppressed. Furthermore, the oxidation reaction of the charge 44 remaining in the furnace bottom block 7 can be suppressed by blocking the entry of outside air containing oxygen.
Furnace body whole circumference cutting process S44 is a process of dividing furnace bottom block 7 and upper furnace body 6 by cutting furnace body 4 over the whole circumference.
3 and 4, the furnace body full circumference cutting step S 44 cuts the cut region 4 B (between the upper end level L 1 and the lower end level L 2) set over the entire circumference of the furnace body 4. When the work opening 4C is formed by the preceding furnace body opening step S41, the other portions are cut (cutting the iron skin 41, removing the stave 43A and the refractory material 42A).
The setting of the excision region 4B is performed as follows (see FIG. 3).
For the upper end level L1 of the cut region 4B, the lower end level L0 of the annular tube 51 is referred to, and the joint position of the stave 43 installed in the furnace body 4 is referred to, and the highest joint among the upper joints of the stave lower than the level L0. The level of the upper joint of the stave at a high position is selected as the upper end level L1. By such setting of the upper end level L1, a portion above the height overlapping with the annular tube 51 of the furnace body 4 can be left as the upper furnace body 6, and when being carried out as the furnace bottom block 7, Interference can be avoided.
For the lower end level L2 of the cut region 4B, an upper joint of another stave located at a position lower than the level L1 is selected. Usually, if the level of the upper joint of another stave at the highest position among the upper joints of another stave located at a position lower than the level L1 is selected as the lower end level L2, the excision region 4B is one sheet of the stave 43. It becomes the area of the height of minutes. For example, if the level of the upper joint of another stave at the second highest position is selected as the lower end level L2, the excision region 4B can be a region having a height corresponding to two of the stave 43. By setting the lower end level L2, a sufficient space is ensured between the lower end of the upper furnace body 6 and the upper end of the furnace bottom block 7 to be carried out (or the renewed furnace bottom block 7A to be carried in again). Thus, even when vertical displacement or the like occurs during unloading and loading, or when the cutting edge height of the furnace block 7 or the upper furnace body 6 varies vertically, mutual interference can be avoided. .
In the combustible gas discharge step S45, combustible gas generated inside the red hot content 47 remaining in the furnace bottom block 7 previously coated with the coating material 44D is guided to the outside and burned. It is a process to disperse.
In FIG. 6, the tuyere 45 from which the connecting pipe 52 is removed remains in the furnace bottom block 7. The tuyere 45 communicates with the red hot contents 47 covered with the covering material 44D inside the furnace bottom block 7. Therefore, combustible gas (coke combustion reaction (C + CO → CO ₂ ) Produced by carbon dioxide further reacts with coke (C + CO ₂ → 2CO), carbon monoxide generated in the direct reduction reaction of iron ore and coke, etc.) can be discharged from the tuyere 45.
Here, it is a safety problem to disperse the combustible gas as it is in the atmosphere. For this reason, a discharge pipe 45A having a pilot burner at the tip is connected to the tuyere portion 45 (including the internal cooling and external cooling portions) so that combustible gas is burned and diffused into the atmosphere.
The inert gas filling step S46 is a step of filling the inside of the red hot contents 47 previously covered with the coating material 44D with the inert gas.
As described above in the description of the combustible gas discharge step S45, the red-hot contents 47 of the furnace bottom block 7 covered with the coating material 44D are maintained at a high temperature, and the reduction reaction of the iron ore is continued. . However, it is desirable that the reaction is deactivated toward the dismantling of the furnace bottom block 7. Therefore, it is desirable to inject an inert gas into the red hot contents 47 covered with the covering material 44D to block oxygen.
In FIG. 6, the inert gas is injected from the outside using the tuyere 45 as in the combustible gas discharging step S45. As the inert gas, nitrogen gas is desirable because it is inexpensive. Carbon dioxide, argon, or other nonflammable gas may be used, or a gas used as a fire extinguisher may be used.
The inert gas filling step S46 may be performed following the above-described combustible gas discharge step S45. In this case, the inert gas injection tube is connected after removing the discharge pipe 45A used in the combustible gas discharge step S45. do it. The inert gas filling step S46 and the combustible gas discharging step S45 may be performed in parallel. For example, an inert gas is injected from the right tuyere 45 of FIG. It is desirable to form a flow that takes gas in and out, such as exhaust.
In the cooling system switching step S47, in order to carry out the furnace bottom block 7, the cooling system for the stave 43 installed in the furnace bottom block 7 is switched from the cooling device on the blast furnace 1 side to the cooling device 20 of the transportation platform 12. It is a process. By such switching of the cooling system, the refrigerant is circulated from the cooling device 20 of the carrier base 12 to the stave 43 of the furnace bottom block 7, and the furnace bottom block 7 is separated from the blast furnace 1 together with the carrier base 12. Thus, it can be carried out of the installation site 2.
Here, although the cooling device 20 is installed on the transportation platform 12, the transportation platform 12 is on the transportation path 11 adjacent to the foundation 3 (see FIG. 1 and the like), and until the unloading step S5 described later. The furnace bottom block 7 connecting the cooling system and the cooling device 20 are separated. For this reason, when switching to the cooling device 20, the piping between the furnace bottom block 7 (refrigerant piping 22 and 23 in FIG. 6) is flexible and can be adapted to a long distance. It is desirable to keep it.
Note that the order of performing the steps S41 to S47 in the separation step S4 has the following conditions.
The furnace body opening step S41, the content surface leveling step S42, and the content surface covering step S43 need to be performed in this order based on the work contents.
The combustible gas discharge step S45 and the inert gas filling step S46 may be performed simultaneously, and each is preferably performed after the content surface covering step S43 in relation to the outside air blocking.
The entire furnace body cutting step S44 can be performed at any stage as long as it is after the furnace body opening process S41.
The cooling system switching step S47 can also be performed at an arbitrary stage. However, in order to use the cooling device on the blast furnace 1 side as long as possible, it is preferable to carry out at the final stage of the separation step S4.
After the furnace bottom block 7 is separated by the separation process S4 as described above and switched to the cooling device 20, the unloading process S5 of the furnace bottom block 7 is performed.
In the unloading step S5, the old furnace bottom block unloading step S51 and the gantry cooling device operating step S52 are performed in parallel.
As shown in FIG. 5, the old furnace bottom block unloading step S 51 is a step in which the furnace bottom block 7 is pulled out horizontally and transferred to the transfer platform 12, and the transfer platform 12 is moved to the work site 8. The furnace bottom block 7 to be transported is separated from the furnace body 4 (furnace body whole-section cutting process S44, basic cutting process S22) in the process up to the separation process S4 described above, and switching of the cooling system ( A cooling system switching step S47) has been performed, and the system can be moved from the blast furnace 1 of the installation site 2 at any time.
In FIG. 5, in the old furnace bottom block unloading step S51, the furnace bottom block 7 is pulled out horizontally and transferred from the blast furnace 1 to the upper surface (mounting surface) of the carrier 12; An operation of pulling the placed transfer platform 12 along the transfer path 11 and moving it to the work site 8 is performed. During the operation of carrying out the furnace bottom block 7, the furnace bottom block 7 is continuously cooled by the cooling device 20 of the transfer platform 12 (frame cooling device operation step S 52), and the furnace body of the furnace bottom block 7 is Suppresses deformation caused by overheating.
The furnace bottom block 7 that has been moved to the work site 8 by the transportation platform 12 enters the dismantling work as it is (refer to the old furnace bottom block dismantling process S9, FIG. 2). In the process of the old furnace bottom block dismantling process S9, the gantry cooling device operating process S52 may be continued. In the old furnace bottom block dismantling step S9, when the internal heat becomes a problem in the dismantling operation, water injection cooling S91 may be performed. The water injection cooling S91 here is a limited range of the furnace bottom block 7 and heat generation from the red hot contents 47 has already been suppressed, so that compared to the conventional water injection cooling for the entire blast furnace 1 It can be small enough.
After the unloading step S5 as described above, a rebuilding step S6 using the renewal furnace bottom block 7A is performed. The renewal furnace bottom block 7A used in the reconstruction process S6 is manufactured in advance at another work site (see renewal furnace bottom block manufacturing process S8, FIG. 2).
The restructuring step S6 includes an update bottom block carrying-in / installing step S61 for carrying in the renewed bottom block 7A, and a bottom bottom block reconnecting step for reconnecting the carried bottom block 7A with the upper furnace body 6. S62 and a furnace body cooling pipe restoring step S63 for connecting a cooling device on the blast furnace 1 side to the furnace bottom block 7A.
In the renewal furnace bottom block carrying-in / installation step S61, the renewal bottom block 7A is carried and installed on the site where the bottom 7 of the bottom of the blast furnace 1 has been unloaded. For this reason, the upper surface of the ruins to be installed is previously flattened so that the bottom surface of the renewal furnace bottom block 7A can be stably received.
The renewal furnace bottom block 7 A can use the same configuration as the old furnace bottom block 7. The renewal furnace bottom block 7A can be larger or smaller than the old furnace bottom block 7, but since the upper furnace body 6 is shared, it is not suitable for significant changes.
The renewal furnace bottom block 7A is manufactured in advance in the renewal furnace bottom block manufacturing step S8. The work site for manufacturing is the same as or adjacent to the work site 8 described above that performs the old furnace bottom block dismantling process S9. Thereby, when sharing the conveying apparatus 10 for carrying in, all or one part of the conveyance path | route 11 can be shared. If the work site for manufacturing is completely different, it is necessary to install a separate transfer device.
In any case, the work in the renewal furnace bottom block carrying-in / installing step S61 is the reverse of the old furnace bottom block carrying-out process S51 described above.
The furnace bottom block reconnection step S62 is performed by the upper furnace body 6 supported above the renewal furnace bottom block 7A carried into the furnace bottom portion of the blast furnace 1 by the renewal furnace bottom block carrying-in / installation step S61. It is a process of connecting.
As described in the above-described separation step S4, when the upper furnace body 6 and the old furnace bottom block 7 are separated, the width of the cut region 4B corresponding to the stave 43A is given. Therefore, when the renewal furnace bottom block 7A and the upper furnace body 6 are connected, the iron shell 41, the stave 43, and the refractory material 42 are replenished to the mutually spaced portions (corresponding to the cut region 4B).
Through the furnace bottom block reconnection step S62, the renewed furnace bottom block 7A and the upper furnace body 6 are connected, and a series of furnace bodies 4 from the furnace top to the furnace bottom is restored.
The furnace body cooling pipe restoration step S63 is removed in the cooling system switching step S47 described above with respect to the renewal furnace bottom block 7A carried into the furnace bottom part of the blast furnace 1 in the renewal furnace bottom block carrying-in / installation step S61. This is a step of reconnecting the cooling device on the blast furnace 1 side. By this furnace body cooling pipe restoration step S63, the cooling function by the cooling device on the blast furnace 1 side is restored for the entire series of furnace bodies 4 including the furnace bottom block 7A and the upper furnace body 6.
Note that after the renewal furnace bottom block carrying-in process S61 is performed, the furnace bottom block reconnection process S62 and the furnace body cooling pipe restoration process S63 can be performed at any time, and each is performed in parallel. Alternatively, the furnace body cooling pipe restoration step S63 may be performed after the furnace bottom block reconnection step S62.
After the restructuring step S6 as described above, a trial operation step S7 is performed.
When various adjustments are made in the trial operation step S7 and the prescribed inspection is completed, the operation returns to the normal operation.
FIG. 7 shows another embodiment of the present invention.
In the present embodiment, the furnace bottom block 7 and the transfer platform 12 are the same as those in the above-described embodiment shown in FIGS.
In the present embodiment, the cooling device 30 by evaporative cooling is used as one that is installed on the carrier 12 and provides the cooling function of the furnace bottom block 7.
In FIG. 7, a replenishment pipe 31 is installed vertically on a part of the carrier 12, and the upper end thereof is opened to the atmosphere by an opening 32. The lower end of the replenishment pipe 31 is connected to the refrigerant introduction part 43 B on the lower end side of the series of stave 43 via the refrigerant pipe 33. The refrigerant extraction portion 43T on the upper end side of the series of stave 43 is opened to the atmosphere through an opening.
In such a cooling device 30, a part of the refrigerant (water) that has absorbed heat in the stave 43 evaporates at the refrigerant outlet 43T and is dissipated to the atmosphere to dissipate heat. The refrigerant decreases with evaporation, and this decrease is replenished from the replenishment pipe 31.
When such a cooling device 30 by evaporative cooling is used, the structure is very simple and the power of the pump or the like can be omitted.

The present invention relates to a blast furnace bottom disassembly method and a conveying device, and can be used to carry out a bottom block at the time of renewal or dismantling of a blast furnace, particularly for carrying out a bottom block when reusing an upper furnace body.

DESCRIPTION OF SYMBOLS 1 ... Blast furnace 2 ... Installation site 3 ... Foundation 4 ... Furnace body 4A ... Supporting member 4B ... Excision area 4C ... Work opening 5 ... Furnace body cage 6 ... Upper furnace body 7, 7A ... Furnace bottom block 8 ... Work site 10 ... Conveying device 11 ... Conveying path 12 ... Conveying platform 13 ... Lower sliding means 14 ... Upper sliding means 20 ... Cooling device 21 ...

Radiator

22,23 ... Refrigerant pipe 24 ... Pump 30 ... Cooling device 31 ... Supply pipe 33 ... Refrigerant piping 41 ...

Iron skin

42, 42A ...

Refractory material

43, 43A ... Stave 43B ... Refrigerant introduction part 43T ... Refrigerant take-out part 44 ...

Charge

44A, 44B, 44C ... Surface 44D ... Covering material 45 ... Tuyere 45A ... Discharge Pipe 46 ... Hot metal 47 ... Red-hot contents 51 ... Ring pipe 52 ... Connection pipe 53 ... Supporting part 61 ... Heavy machinery 62 ... Excavator part S1 ... Reduction operation S2 ... Preparatory process S21 ... Upper furnace body supporting process S3 ... Blowing Stop S4 ... Separation process S41 ... Furnace body opening process S42 ... Contents surface leveling process S43 ... Contents surface covering process S44 ... Furnace body whole circumference excision process S45 ... Combustible gas discharge process S46 ... Inert gas filling process S47 ... Cooling System switching step S5 ... Unloading step S51 ... Old furnace bottom block unloading step S52 ... Mounting frame cooling device operation step S6 ... Reconstruction step

Claims

A method for disassembling a blast furnace bottom part that separates a furnace bottom block from a furnace body installed at an installation site, and carries out the separated furnace bottom block from the installation site,
A separation step of separating the furnace bottom block from the furnace body in a state in which water is not cooled to the furnace body, and a carrying-out step of carrying out the separation from the installation site while cooling the separated furnace bottom block. A method for dismantling the bottom of the blast furnace.
In the dismantling method of the blast furnace bottom part according to claim 1,
A method for disassembling a blast furnace bottom portion using a carrier for placing the furnace bottom block in the unloading step.
In the dismantling method of the blast furnace bottom part according to claim 2,
In the unloading step, the furnace bottom block dismantling method is characterized in that the furnace bottom block is cooled using a cooling device installed on the carrier.
In the method of disassembling the blast furnace bottom part according to claim 3,
The separation step includes a cooling system switching step of switching a pipe connected to a cooling stave of the furnace bottom block from a cooling device installed on the installation site to a cooling device installed on the transportation platform, During normal operation, the refrigerant is circulated from the cooling device installed at the installation site to the stave, and in the unloading step, the refrigerant is circulated from the cooling device installed on the transfer stand to the stave. A method for dismantling the bottom of the blast furnace.
5. The method for disassembling a blast furnace bottom according to any one of claims 1 to 4, wherein the upper furnace body separated from the furnace bottom block is supported on a blast furnace pit in an operating state before the separation step. A method for disassembling a bottom portion of a blast furnace furnace, comprising an upper furnace body supporting step.
In the dismantling method of the blast furnace bottom part according to claim 5,
The separation step includes a cutting step for forming a cutting region over the entire circumference of the furnace body of the blast furnace, and the cutting region has an upper joint of a stave whose upper edge is directly below the annular tube of the blast furnace. And disassembling the bottom of the blast furnace, characterized in that the lower edge height is the upper joint height of another stave located at a position lower than the upper joint of the stave having the upper edge height. .
The method for disassembling a blast furnace bottom according to any one of claims 1 to 6, wherein the separation step includes covering the surface of the red hot contents remaining in the furnace bottom block with a covering material. A method for disassembling a bottom portion of a blast furnace furnace, comprising a covering step for blocking an object from outside air.
In the dismantling method of the blast furnace bottom part according to claim 7,
Prior to the coating step, the separation step forms an opening in the furnace body of the furnace bottom block, introduces a part of heavy equipment from the opening, and the red hot state remaining in the furnace bottom block by the heavy equipment. A method for disassembling a bottom portion of a blast furnace, comprising a leveling step of leveling the surface of the contents.
9. The method for disassembling a blast furnace bottom according to claim 7 or claim 8, wherein the separation step generates a combustible gas generated from red-hot contents remaining in the furnace bottom block covered with the coating material. A method for disassembling the bottom of a blast furnace furnace, characterized by having a combustible gas discharge step that induces the gas to burn and then burns it to the atmosphere.
10. The method of disassembling a blast furnace bottom according to claim 7, wherein the covering step fills the red hot contents covered with the covering material with an inert gas. A method for disassembling a blast furnace bottom, comprising a filling step.
A blast furnace bottom transport device used to separate a bottom block from a furnace body installed at an installation site, and to carry out the separated furnace bottom block from the installation site. A bottom of the blast furnace having a mounting surface, and a cooling device that is installed on the transport base and circulates a coolant to a cooling stave in the bottom block. apparatus.
In the blast furnace bottom transfer device according to claim 11,
The cooling device includes a refrigerant pipe connected to the cooling stave, a pump that circulates the refrigerant in the refrigerant pipe, and a radiator that radiates heat of the refrigerant that circulates through the refrigerant pipe. A transfer device for the bottom of the blast furnace.
The blast furnace bottom transfer apparatus according to claim 11, wherein the cooling device includes an opening opened to the atmosphere on the upper end side of the cooling stave, a refrigerant pipe connected to the lower end side of the cooling stave, A conveying device for a bottom portion of a blast furnace furnace, having a water supply pipe having a lower end connected to a refrigerant pipe and an upper end opened to the atmosphere.