JP6553526B2 - How to disassemble the hot blast furnace - Google Patents

Description

  The present invention relates to a method of disassembling a hot blast furnace, and relates to a method of disassembling an external combustion hot blast furnace or a furnace top burning hot blast furnace in which a combustion chamber is not provided side by side within a heat storage chamber furnace.

Conventionally, a hot stove has been used to supply a high-temperature gas to a blast furnace or the like.
The hot stove has a combustion chamber that generates high temperature gas by combustion, and a heat storage chamber that stores heat of the generated high temperature gas.
The heat storage chamber is configured by stacking a large number of checker bricks in the furnace body, and when generating a high-temperature gas, the heat storage chamber stores heat by passing the high-temperature gas from the combustion chamber. On the other hand, when the high temperature gas is supplied, the outside air is heated by passing the outside air through the checker brick, and is supplied to the blast furnace or the like as the high temperature gas.

The combustion chamber is installed in various forms with respect to the heat storage chamber.
In the internal combustion hot blast furnace, a combustion chamber is provided in the furnace of the heat storage chamber. That is, checker bricks constituting the heat storage chamber are stacked in the furnace body, and a chimney-like space communicating vertically is formed in a part of the planar shape. And this space is utilized as a combustion chamber by installing a burner in the bottom of this space.

In the external combustion type hot stove, the furnace of the combustion chamber is installed adjacent to the furnace of the heat storage chamber. And each furnace top is connected and the high temperature gas from a combustion chamber is supplied to a thermal storage chamber.
The furnace top type hot blast furnace has a burner installed outside the furnace top portion of the furnace body of the heat storage chamber. And the hot gas from a burner is supplied to the furnace top of a thermal storage chamber.
In these external combustion type hot air furnaces and furnace top combustion type hot air furnaces, checker bricks are installed on the entire planar shape in the furnace body of the heat storage chamber. That is, there is no chimney-like space without checker bricks, such as an internal combustion hot blast stove.

In any of the various types of hot blast furnaces described above, the checker bricks in the heat storage chamber deteriorate with operation. For this reason, it is necessary to update the checker brick. Specifically, the checker bricks loaded in the furnace are carried out of the furnace, and new checker bricks are stacked in the furnace.
For this purpose, various dismantling methods have been conventionally proposed.

Patent Document 1 proposes a dismantling method for an external combustion type hot stove.
In Patent Document 1, a carry-out duct is installed along the outer periphery of the furnace body of the heat storage chamber, a carry-out opening is formed at each height of the furnace body, and each is communicated with the carry-out duct. Then, the checker brick is disassembled in order from the top in the furnace body and carried out of the nearest opening to the duct.

Patent Document 2 proposes a dismantling method for an internal combustion type hot stove.
In Patent Document 2, a combustion chamber provided in a furnace of a heat storage chamber is diverted as a so-called discharge duct. That is, the checker bricks are sequentially disassembled from above in the heat storage chamber portion in the furnace body, and the disassembled checker bricks are dropped into the combustion chamber and carried out from the bottom of the furnace.

Japanese Patent Application Laid-Open No. 57-120605 JP 2003-34812 A

The disassembling method of Patent Document 1 described above can be used not only for disassembling an external combustion type hot stove, but also for disassembling a furnace top burning hot stove. However, in the work, it is necessary to install a carry-out duct and a carry-out opening in the furnace body of the regenerative furnace, and there are problems of complicated work adjustment and a long construction period.
On the other hand, in the disassembling method of Patent Document 2 described above, there is no need to install the unloading duct and the unloading opening, and the work can be simplified and the construction period can be shortened. However, the disassembling method of Patent Document 2 can be applied only to an internal combustion type hot blast stove in which a combustion chamber is provided side by side in a furnace body of a heat storage chamber.
Because of this, in a hot air furnace such as an external combustion hot air furnace or a furnace top combustion hot air furnace in which a combustion chamber is not additionally provided within the heat storage chamber furnace body, a dismantling method is available that simplifies the work and shortens the construction period. It was requested.

  The object of the present invention is to provide a hot air furnace which can simplify the work and shorten the construction period even in a hot air furnace such as an external combustion hot air furnace or a furnace top combustion hot air furnace in which no combustion chamber is installed inside a heat storage chamber. It is about providing the dismantling method.

  The dismantling method of the hot blast furnace according to the present invention is applied to a hot blast furnace having a brick laminate formed by stacking a large number of checker bricks in the furnace body of the heat storage chamber, and dismantling the brick laminate to produce the blast furnace And the checker brick is dug down at a part of the upper surface of the brick laminate to form a chute portion extending to the lower portion of the furnace body, and a lower portion of the furnace body A preceding dismantling step of forming a discharge port communicating with the chute portion, and a remaining portion dismantling step of cutting out the remaining portion of the brick laminate, dropping it onto the chute portion, and discharging it from the discharge port. It is characterized by

In the present invention as described above, the chute portion is formed on the brick laminate in the preceding dismantling process, and the checker brick in which the brick laminate is dismantled can be efficiently carried out using the chute portion in the remaining part dismantling process.
For this reason, also in the external combustion type hot blast furnace and the furnace top burning type hot blast furnace, it is possible to carry out the checker brick through the inside of the furnace body, and there is no need to install a carrying out duct etc. outside the furnace body. And the construction period can be shortened.
In the prior dismantling process, checker bricks taken out by digging down the chute part are carried out separately from the furnace top side, but by appropriately setting the division as the chute part (division set to the planar shape of the brick laminate upper surface) By minimizing the amount of bricks to be carried out separately, it is possible to increase the ratio of efficient carrying out by the remaining part dismantling process.

  In the method of disassembling the hot blast stove of the present invention, in the preceding disassembling step, it is desirable to install a support for preventing collapse and spalling on the inner wall of the chute portion.

The inner wall of the chute is in a rough state due to the fact that some bricks are crushed in the middle for the convenience of being formed by digging up the checker bricks that make up the brick laminate, and collapse and peeling may occur is there.
However, in the present invention, the support tool can prevent the inner surface of the chute portion from collapsing or falling off, and a stable chute portion can be formed. Moreover, the safety | security of the operation | work within a chute | shoot part is securable.

  In the dismantling method of the hot blast furnace according to the present invention, it is preferable that in the preceding dismantling step, a carry-out device capable of moving up and down the inside of the chute portion is installed, and the checker brick is carried out to the furnace top side using the carry-out device. .

In the present invention, in the preceding dismantling process, even when the chute part is deepened when the chute part is dug down, it can be moved up and down in the chute part using the carry-out device, and the excavated brick is carried out to the furnace top side. The unloading device can be used for the work to be performed, and the work can be performed efficiently.
In addition, a gondola, a hoist, a perpendicular | vertical conveyance bucket conveyor etc. can be utilized as a carrying out apparatus of this invention.

  In the dismantling method of the hot blast furnace according to the present invention, in the preceding dismantling step, a safety deck for partitioning the upper portion of the furnace body is installed, and the chute portion is dug down below the safety deck. It is desirable to dismantle the bricks stacked on the inner surface of the furnace body above the deck.

  According to the present invention, in the prior dismantling process, the forming operation of the chute portion and the disassembling operation of the inner surface brick in the upper part of the furnace can be performed in parallel at the upper and lower sides of the safety deck. It can be shortened. In particular, although the formation of the chute portion is an increasing construction period in the present invention, the period can be prevented from increasing by making it parallel to the disassembling period of the conventional furnace upper portion.

  According to the method of disassembling the hot blast furnace of the present invention, the operation can be simplified and the construction period of the hot blast furnace such as the external combustion type hot blast furnace or the furnace top combustion type hot blast furnace is not provided with a combustion chamber It can be shortened.

Sectional drawing which shows the external combustion type hot stove in one Embodiment of this invention. The figure which shows the work procedure of this embodiment. The figure which shows the scaffold installation work of this embodiment. The enlarged view which shows the safety deck installation operation | work of this embodiment. The figure which shows the carrying-out apparatus installation work and safety deck upper scaffold installation work of this embodiment. The figure which shows the brick digging work of this embodiment, and the safety deck upper brick dismantling work. The top view which shows the division setting of the chute | shoot part of this embodiment. The perspective view which shows the brick digging state of the 1st layer of the chute | shoot part of this embodiment. The perspective view which shows the brick digging state of the 2nd layer of the chute | shoot part of this embodiment. The perspective view which shows the brick digging state of the 3rd layer of the chute | shoot part of this embodiment. The figure which shows the support tool installation operation | work of this embodiment. The enlarged view which shows the support tool installation operation | work of this embodiment. The figure which shows the brick digging work using the gondola of this embodiment. The figure which shows the installation operation | work of the duct for discharge of this embodiment, and a discharge port. The figure which shows the initial stage of the remainder dismantling process of this embodiment. The figure which shows the intermediate | middle stage of the remaining part dismantling process of this embodiment. The figure which shows the removal operation | work of the checker receiving metal object of this embodiment. The figure which shows the state which the dismantling operation | work inside the furnace body of this embodiment was complete | finished. Sectional drawing which shows the furnace top combustion type hot stove in other embodiment of this invention. The figure which shows the brick digging work using the hoist in other embodiment of this invention. The figure which shows the brick digging work using the vertical conveyance bucket conveyor in other embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described based on the drawings.
FIG. 1 shows a hot stove 1 to which the dismantling method of the present invention is applied.
The hot blast stove 1 is an external combustion type hot blast stove in which a combustion chamber 20 is installed outside the heat storage chamber 10.
The heat storage chamber 10 has a cylindrical furnace body 11, a checkered receptacle 12 is installed at the bottom, and a brick laminate 13 is installed on the upper surface thereof.
The brick laminate 13 is formed by laminating a large number of checker bricks, and is formed over the entire area of the flat cross-sectional shape of the furnace body 11 and from the bottom to the top of the furnace body 11.

In the heat storage room 10, the conical part 14 is installed in the upper part of the furnace body 11, and the dome part 15 is installed in the upper part. Bricks are stacked on the inner wall of the furnace body of the conical portion 14 and the dome portion 15 respectively.
The combustion chamber 20 has a cylindrical furnace body 21, and the dome portion 15 described above is connected to the upper portion thereof, and communicates with the interior of the furnace body 11 of the heat storage chamber 10 through the dome portion 15.

In the combustion chamber 20, at the bottom of the furnace body 21, a burner 22 for heating is installed. A mixing chamber 23 is connected to the side surface of the furnace body 21, and a blast pipe 24 connected to the blast furnace is connected to the mixing chamber 23.
Bricks are also stacked on the furnace body 21 of the combustion chamber 20 and the inner wall of the mixing chamber 23, respectively.

In disassembling such a hot stove 1, the brick laminate 13 inside the heat storage chamber 10 is dismantled or carried out, the bricks stacked on the conical part 14 and the dome part 15 are disassembled or carried out, and the furnace body 21 of the combustion chamber 20. Also, it is necessary to disassemble or carry out the bricks stacked on the inner wall of the mixing chamber 23.
Especially, since the checker brick which comprises the brick laminated body 13 reaches a huge quantity, it occupies a big ratio in the operation | work and work period which dismantle the hot stove 1. So, in this embodiment, the process based on the present invention is adopted.

FIG. 2 shows specific steps in dismantling the hot stove 1.
In the present embodiment, in the dismantling of the brick laminate 13 in the heat storage chamber 10, the preceding dismantling process P1 and the remaining dismantling process P2 based on the present invention are performed, and the brick of the dome 15 is also dismantled in parallel with this. It should be noted that the brick of the conical portion 14 is disassembled together with the disassembly of the brick laminate 13, and the brick of the combustion chamber 20 and the mixing chamber 23 can be disassembled in parallel with the disassembly of the brick laminate 13.

In FIG. 2, in the preceding disassembling process P1, first, the condition in the furnace is confirmed in each of the heat storage chamber 10 and the dome portion 15 (step S1). If there is no abnormality, the scaffolding and the carry-out device are installed (step S2).
At this process S2, as shown in FIG. 3, the seating 31 is laid on the upper surface of the brick laminated body 13, and the scaffold 32 is assembled on it.
Subsequently, as shown in FIG. 4, the safety deck 33 is installed to separate the dome portion 15 from the heat storage chamber 10.
Then, as shown in FIG. 5, the scaffold 34 is assembled on the safety deck 33.
Moreover, on the seat cushion 31, the gondola 35 for raising / lowering is prepared as an unloading apparatus.

Returning to FIG. 2, after the installation of the scaffolding and the unloading device (step S <b> 2), the dome brick is disassembled (step S <b> 3) at the dome portion 15, and the chute brick is preceded by the brick laminate 13 in parallel. Dismantling (step S4) is performed.
As shown in FIG. 6, on the upper side of the safety deck 33, as step S <b> 3, the bricks 150 stacked on the inner wall of the dome portion 15 are disassembled using the scaffold 34, and the combustion chamber 20 (see FIG. 1) side is disassembled. Carry out. A manhole may be formed in the dome portion 15 and carried out.
On the other hand, on the lower side of the safety deck 33, as the step S4, a section along the furnace body 11 on the upper surface of the brick laminate 13 is set, and in this section, the checker brick 130 constituting the brick laminate 13 is dug down A chute portion 36 extending toward is formed.

As a section which forms chute part 36, as shown in Drawing 7, it shall be along furnace body 11 of the upper surface of brick layered product 13, and along a joint of checker brick 130 which constitutes brick layered product 13 .
However, the checker bricks 130 constituting the brick laminate 13 are so-called stacking method so-called "AB stacking" or "ABC stacking" so as to horizontally load each other in order to load each other in the layers in contact with the upper and lower sides. Therefore, even if it is a seam of the checker brick 130 on the upper surface of the brick laminate 13 (see FIG. 8), the individual checker bricks 130 are divided in the middle at other levels (see FIG. 9 and FIG. 10).

As a result, as shown in FIG. 8, the inner wall surface of the chute portion 36 is the side surface of the checker brick 130 at the boundary where the boundary of the chute portion 36 is the seam of the checker brick 130, and the wall surface is well-organized.
However, as shown in FIG. 9 and FIG. 10, in the hierarchy in which the boundary of the chute portion 36 is in the middle of the checker brick 130, the inner wall surface of the chute portion 36 becomes a surface where the checker brick 130 is broken halfway and becomes an irregular wall surface. .
However, in the present embodiment, by installing a support on the inner wall surface of the chute portion 36 as described later, the material of the checker brick 130 collapses. Inconvenience such as peeling is prevented.

Returning to FIG. 2, following the preceding dismantling of the chute part brick (step S4), a support is installed inside the chute part (step S5).
As shown in FIG. 11, a panel-like, sheet-like or net-like support 362 is stretched on the inner wall surface 361 of the chute 36 formed on the brick laminate 13.
As shown in FIG. 12, the support 362 has locking portions 363 at the upper and lower edges, and can be continuous by mutual engagement.
At the time of installation, first, the upper support 362 is disposed along the inner wall surface 361 and fixed to the inner wall 361 by the anchor 364. Next, the lower support 362 is placed along the inner wall surface 361 and is suspended and held by the locking portion 363 on the lower edge of the upper support 362. In this state, the anchor 364 is hit and fixed to the inner wall surface 361. To do. In the same manner, the support 362 is extended downward.

Returning to FIG. 2, the preceding dismantling of the chute unit brick (step S <b> 4) and the installation of the supporting tool inside the chute unit (step S <b> 5) use the gondola 35 that is a carry-out device that has been previously installed. Repeatedly move in parallel at different heights while moving downward sequentially. This repetition is performed until it is determined in step S6 that the leading disassembly lower limit, ie, the lower end of the brick stack 13 has been reached.
As a result, as shown in FIG. 13, the digging of the chute portion 36 using the gondola 35 which is a carry-out device and the installation of the support 362 are gradually advanced downward.

Returning to FIG. 2, when the preceding dismantling of the chute part brick (step S <b> 4) and the installation of the support on the inside of the chute part (step S <b> 5) reach the preceding dismantling lower limit determined in step S <b> 6, The discharge port is opened (step S7). Further, the scaffolding and unloading device previously installed are removed (step S8).
As shown in FIG. 14, when the chute portion 36 reaches the lower end of the brick laminate 13, a discharge port 37 is formed in the lower portion of the furnace body 11 so that the lower end of the chute portion 36 communicates with the outside of the furnace. On the other hand, in the upper part of the heat storage chamber 10, the seating 31, the scaffold 32, and the gondola 35, which is a carry-out device, installed on the upper surface of the brick laminate 13 are removed. If the removal of the brick of the dome portion 15 has been completed, the safety deck 33 and the scaffold 34 are also removed while the brick of the conical portion 14 is dismantled.

Returning to FIG. 2, the preceding disassembly step P1 is configured by the above steps S1 to S8.
At the time when the preceding dismantling process P1 is completed, the brick laminate 13 in which the chute portion 36 is formed remains in the heat storage chamber 10 (see FIG. 15).
Therefore, in order to disassemble the remaining brick laminate 13, the remaining part disassembly process P2 is performed.
In the remaining part demolition process P2, the brick laminate 13 is sequentially disassembled from the upper surface side and dropped onto the chute part 36 (process S9), and this is repeated up to the lowest stage of the brick laminate 13 (process S10).

In step S9, as shown in FIG. 15, a construction machine 38 such as a power shovel is introduced to the upper surface of the brick stack 13 in the heat storage chamber 10 through the dome portion 15.
Then, as shown in FIG. 16, the construction machine 38 digs up the checker brick 130 on the entire top surface of the brick laminate 13 and drops it as brick waste 131 onto the chute portion 36. The dropped brick waste 131 is accumulated at the bottom of the chute portion 36 and discharged from the discharge port 37 to the outside of the furnace.

Returning to FIG. 2, after the brick laminate 13 is removed, removal of the checkered receptacle is performed (step S11).
As shown in FIG. 17, in the heat storage chamber 10 from which the brick laminate 13 has been removed, the checker receptacle 12 remains at the bottom. Therefore, the checker bracket 12 is disassembled and carried out of the furnace.
Thereby, as shown in FIG. 18, all the contents including the brick laminated body 13 are removed from the inside of the thermal storage chamber 10 (process S12 of FIG. 2).

According to this embodiment, the following effects can be obtained.
In the present embodiment, the chute portion 36 is formed in the brick laminate 13 in the prior disassembly step P1, and the brick scrap 131 of the checker brick 130 obtained by disassembling the brick laminate 13 is formed in the chute portion 36 in the remaining disassembly step P2. Can be efficiently carried out using
Therefore, also in the hot blast furnace 1 of the present embodiment, which is an external combustion hot blast furnace, or the furnace top burning hot blast furnace, the brick waste 131 of the checker brick 130 can be carried out through the inside of the furnace body 11 There is no need to set up a discharge duct outside the body, and the work can be simplified and the construction period can be shortened.

  In the prior dismantling process P1, the checker brick 130 taken out by digging down the chute portion 36 is carried out separately from the dome portion 15. However, the section to be the chute portion 36 (section set to the planar shape of the upper surface of the brick laminate 13) By setting B) appropriately, it is possible to minimize the amount of bricks to be carried out separately and to increase the ratio of the efficient carrying out in the remaining part dismantling process P2 and the like.

  In the present embodiment, the support 362 for preventing collapse and separation is installed on the inner wall surface 361 of the chute portion 36 in the prior disassembly process P1. Therefore, the support tool 362 can prevent the inner wall surface 361 of the chute portion 36 from collapsing or falling off, and the stable chute portion 36 can be formed. In addition, the safety of work in the chute 36 can be ensured.

  In the present embodiment, in the leading disassembly process P1, a gondola 35 capable of moving up and down the inside of the chute portion 36 is installed as a carry-out device, and the checker brick 130 is carried out to the dome portion 15 using this gondola 35. Therefore, when digging down the chute portion 36, the gondola 35 can be used to move up and down in the chute portion 36 even when the chute portion 36 becomes deep. In addition, the gondola 35 serving as a carry-out device can be used to carry out the excavated checker brick 130 to the dome portion 15, and the work can be performed efficiently.

In the present embodiment, since the safety deck 33 partitioning the upper portion of the furnace body 11 of the heat storage chamber 10 and the dome portion 15 is installed in the prior disassembly process P1, digging down the chute portion 36 below the safety deck 33 Then, the brick 150 stacked on the inner surface of the dome portion 15 can be disassembled above the safety deck 33.
That is, the work for forming the chute portion 36 and the work for dismantling the brick 150 on the inner surface of the dome portion 15 can be performed in parallel above and below the safety deck 33, and the construction period can be shortened compared to sequential construction.

The present invention is not limited to the above-described embodiment, and modifications and the like within the scope in which the object of the present invention can be achieved are included in the present invention.
For example, although the hot stove 1 has been described as the external combustion hot stove in the above embodiment, the present invention can also be applied to a furnace top combustion hot stove.

Another embodiment of the present invention is shown in FIG.
In FIG. 19, the hot blast furnace 2 is a furnace top burning type hot blast furnace, the heat storage chamber 10A has a cylindrical furnace body 11A, a checker receptacle 12A is installed at the bottom, and a brick laminate is provided on the top 13A is installed.
A combustion chamber 20A is connected to the side near the furnace top of the heat storage chamber 10A, and a burner 22A for heating is installed inside the combustion chamber 20A.
A mixing chamber 23A is connected to the side surface of the heat storage chamber 10A, and a blast pipe 24A following the blast furnace is connected to the mixing chamber 23A.

  Also in the disassembling work of the furnace top combustion type hot blast stove 2, the chute portion 36A is formed on the brick laminate 13A by the prior disassembly process P1 (see FIG. 2), and the remaining part of the brick laminate 13A by the remaining disassembly process P2. Can be disassembled and dropped onto the chute portion 36A, so that the efficient disassembling work as described in the embodiment can be performed.

In the above embodiment, the brick laminate 13 and the brick of the dome 15 are demolished in parallel above and below the safety deck 33. Such parallel work and installation of the safety deck 33 are within the scope of the present invention. It is not essential and each operation may be performed sequentially.
In the above embodiment, the upholstery 31 is laid on the brick laminate 13, the scaffold 32 is assembled thereon, and the scaffold 34 is assembled on the safety deck 33. However, the form and structure thereof may be changed as appropriate.

In the embodiment, as the carry-out device, the gondola 35 capable of moving up and down the inside of the chute portion 36 is installed. Other configurations may be used as the unloading device in the present invention.
In another embodiment shown in FIG. 20, as a carry-out device, a hoist 35 </ b> A is installed on the scaffold 31, and the bucket 35 </ b> B is suspended by the hoist 35 </ b> A to raise and lower the inside of the chute portion 36.
In another embodiment shown in FIG. 20, a vertical transfer bucket conveyor 35C is installed as a carry-out device.
The same effects as the embodiments described with reference to FIGS. 1 to 18 can be obtained by the embodiments using such a hoist 35A or the vertical transfer bucket conveyor 35C.

  The present invention relates to a method of disassembling a hot blast furnace, and can be used for a method of disassembling an external combustion hot blast furnace or a furnace top burning hot blast furnace in which a combustion chamber is not provided side by side in a heat storage chamber furnace.

  1, 2 ... hot blast furnace, 10, 10A ... heat storage room, 11, 11A ... furnace body, 12, 12A ... checker receiving material, 13, 13A ... brick laminate, 130 ... checker brick, 131 ... brick scrap, 14 ... conical Parts, 15: Dome parts, 150: Bricks, 20, 20A: Combustion chamber, 21: Furnace body, 22, 22A: Burner, 23, 23A: Mixing chamber, 24, 24A: Blown pipe, 31: Seated, 32: Scaffolding 33: safety deck 34: scaffolding 35: unloading device gondola 35A: unloading device hoist 35B: bucket 35C: unloading device vertical transfer bucket conveyor 36, 36A: chute portion 361 ... inner wall surface, 362 ... support tool, 363 ... locking portion, 364 ... anchor, 37 ... discharge port, 38 ... construction machine, P1 ... leading dismantling process, P2 ... remaining part dismantling process, S1 to S12 Process.

Claims (4)

A method of disassembling a hot air furnace applied to a hot air furnace having a brick laminate formed by stacking a large number of checker bricks inside a furnace body of a heat storage chamber, disassembling the brick laminate and carrying it out of the furnace Because
The checker brick is dug down at a part of the upper surface of the brick laminate to form a chute portion extending to the lower portion of the furnace body, and a discharge port communicating with the chute portion is formed at the lower portion of the furnace body. Dismantling process,
And a remaining part dismantling step of cutting out the remaining part of the brick laminate, dropping it onto the chute part, and carrying it out from the discharge port. In the dismantling method of the hot blast stove according to claim 1,
In the preceding dismantling step, a support for preventing collapsing and falling off is installed on the inner wall of the chute portion. In the method for disassembling a hot stove according to claim 1 or 2,
In the preceding dismantling step, an unloading device capable of moving up and down the inside of the chute portion is installed, and the checker brick is unloaded to the furnace top side using the unloading device. In the method of disassembling a hot blast stove according to any one of claims 1 to 3,
In the preceding dismantling step, a safety deck partitioning the upper portion of the furnace body is installed, and the chute portion is dug down below the safety deck, and in parallel with the inner surface of the furnace body above the safety deck A method of dismantling a hot blast furnace characterized by dismantling loaded bricks.