JPH08260011A - Method for demolishing hot stove - Google Patents

Abstract

PURPOSE: To provide a hot stove demolishing method capable of reducing heavy labor work in comparison with the conventional work without halting the operation of another hot stove. CONSTITUTION: Bricks of a combustion chamber dome 22 and a regenerator dome 32 are demolished by setting a heavy machinary 18 on the bottom wall part 13 of a dome connecting tube. These demolished bricks are piled up on the bricks of the regenerator 30 to form a passage, the heavy machinary 18 is mounted on the bricks of the regenerator 30, and the bricks of the regenerator 30 are demolished. At the time of demolishing the bricks of the straight barrel part 40 in the combustion chamber, a mounting plate on which the heavy machinary 18 is mounted is lowered successively while being supported by plural pins, and the bricks are demolished by using the heavy machinary 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot blast furnace disassembling method for disassembling a hot blast furnace that sends hot air to a blast furnace.

[0002]

2. Description of the Related Art Usually, three to four hot blast stoves are arranged around a blast furnace, and repair work of these hot blast stoves is performed every few years. In this repair work, some or all of the bricks used in the hot stove will be demolished. A blasting method is generally used as a method for dismantling the bricks of a hot stove. As a blasting method, for example, a method is known in which a large number of blasts are applied to the dome portion to dismantle the brick without removing the iron skin of the dome portion (Japanese Patent Laid-Open No. 52-52).
(See Japanese Patent No. 044703). Further, as another method, a brick and a gondola are mainly used to dismantle bricks (see Japanese Patent Laid-Open No. 57-120605), and one of the bricks of a hot stove is mainly manpowered. There is known a method of disassembling a part and depositing it in a hot-air stove, and using the deposited brick as a scaffold to continue dismantling the brick (see Japanese Patent Laid-Open No. 57-089414).

[0003]

Among the above-mentioned disassembling methods, in the disassembling method using blasting, in order to ensure safety, the off-limits area at the time of blasting is widened, and due to the induced current, the Power out the surrounding area to prevent blasting. For this reason, this disassembling method cannot be used when repairing a plurality of hot blast stoves one by one during operation. Also, among the above-mentioned dismantling methods, in the method of dismantling mainly by manpower using a crane and a gondola, when dismantling the arch brick of the dome part, it is dangerous to ride on the brick and dismantle your feet with a breaker. Accordingly, the work of breaking the demolished brick into small pieces that can be thrown into the discharge chute is heavy-weight work with a large hammer. Further, among the above-mentioned dismantling methods, the method of using the accumulated bricks as a scaffold involves a heavy-duty work in which the bricks on the side wall are tilted inside the hot stove and divided into small pieces by a large hammer.

In view of the above circumstances, it is an object of the present invention to provide a hot stove dismantling method that does not stop other hot stoves that are in operation and that has reduced heavy-duty work as compared with the prior art.

[0005]

A hot-blast stove disassembling method of the present invention for achieving the above object is a combustion chamber having a combustion chamber dome in an upper portion and a heat storage chamber dome in an upper portion and separated from the combustion chamber. Hot stove disassembling method for disassembling a hot stove with a heat storage chamber and a dome connecting pipe connecting the combustion chamber dome and the heat storing chamber dome to each other, (1) Dome removal pipe dismantling process of removing and removing the brick of the upper wall using a heavy machine (2) Iron skin removing process of removing the iron skin of each of the combustion chamber dome and the heat storage chamber dome (3) The dome connection After completion of the pipe dismantling step, a heavy machine is arranged from the dismantled portion of the dome connection pipe to the bottom wall of the dome connection pipe, and using this heavy machine, at least a part of the bricks of the heat storage chamber dome and the brick Combustion chamber do (4) A plurality of discharge ports are formed in the iron shell of each of the combustion chamber and the heat storage chamber in the height direction, and a discharge chute for discharging the demolished bricks to the outside (5) Form holes at predetermined intervals in the height direction and the circumferential direction in the iron shell and bricks of the straight part of the combustion chamber, and insert pins of a predetermined length into the holes. This pin is projected into the combustion chamber by the above, and the placing plate on which the heavy equipment is placed is supported by a plurality of pins inserted in the circumferential direction and sequentially lowered, and the heavy equipment placed on the placing plate is used. A combustion chamber dismantling step of discharging the dismantled bricks to the outside through the discharge chute while dismantling the bricks of the combustion chamber. (6) By stacking the bricks dismantled in the dome dismantling step on the bricks of the heat storage chamber, dome The heavy equipment which is arranged in the bottom wall portion of the sintered tube to form a passage to move to the regenerator, the heavy equipment is moved by this passage,
Using this moved heavy machine, the remaining part of the brick of the heat storage chamber dome is dismantled, the brick of the heat storage chamber is started to be dismantled from the upper part of this brick, and the dismantled brick is discharged to the outside through the discharge chute. However, the method is characterized by including a heat storage chamber dismantling step in which the bricks of the heat storage chamber are continuously disassembled.

(7) In the dome connection pipe dismantling step, the iron shell of the upper wall of the dome connection pipe is removed, the brick of the upper wall is disassembled by using a heavy machine, and the disassembled brick Is stored in the bottom wall of the dome connecting pipe. (8) Prior to the dome dismantling step, the top of the brick in the straight part of the combustion chamber is covered and the brick of the heat storage chamber is It is preferable to include a blockage preventing step of inserting a plug for preventing blockage of the non-repaired brick into at least one of the canal hole at the lower end of the repaired brick and the canal hole at the upper end of the non-repaired brick.

[0007]

According to the hot blast stove disassembling method of the present invention, the bricks of the combustion chamber dome and the heat storage chamber dome are disassembled by dismantling the bricks on the upper wall of the dome connecting pipe using a heavy machine and disposing the heavy machine on the bottom wall. The bricks of the heat storage room were dismantled and the bricks of the heat storage room were stacked to form a passage so that the heavy equipment could ride on the bricks of the heat storage room. Therefore, all the bricks of the heat storage room dome could be dismantled with the heavy equipment. Further, since the bricks in the heat storage chamber are dismantled using this heavy machine, the brick dismantling work in the heat storage chamber can be mechanized. When dismantling the bricks in the straight part of the combustion chamber, the loading plate on which the heavy equipment is placed is supported by multiple pins and sequentially lowered, and the heavy equipment is used to dismantle the bricks. Can also be mechanized. Further, since the dismantled bricks can be discharged from the discharge chute to the outside, the brick discharging work can be mechanized, and the heavy-bar work can be reduced as compared with the conventional one. Since this hot-blast stove dismantling method can be performed independently of the operation of other hot-blast stoves, it can be performed without stopping the other hot-blast stoves during operation.

Here, when the methods (7) and (8) are adopted, when some of the bricks of the hot-blast stove are dismantled, the unrepaired bricks under both the combustion chamber and the heat storage chamber are damaged. It can be dismantled without letting it go.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hot-blast stove disassembling method of the present invention will be described below with reference to the drawings. FIG. 1 shows a dome connection pipe disassembling method among the hot stove disassembling methods. In order to dismantle the bricks of the dome of the hot-air stove 10 by using a heavy machine, a deck 16 on which a small heavy machine 14 having a small working radius is placed is installed beside the dome connecting pipe 12. The iron skin of the upper wall of the dome connecting pipe 12 is removed, the brick 12a of the upper wall is dismantled using the small heavy machine 14, and the dismantled brick is used for the bottom wall 13 of the dome connecting pipe 12 (see FIG. 2). Store in.

Next, the large heavy equipment 18 is hoisted by a crane, and as shown in FIG. 2, the large heavy equipment 18 is placed on the brick 13a stored in the bottom wall portion 13 of the dome connecting pipe 12 through the disassembled upper wall portion. To place. As large heavy equipment 18,
A work chamber having a working radius sufficient to dismantle all the combustion chamber dome bricks 24 attached to the combustion chamber dome 22 above the combustion chamber 20 is used. The combustion chamber dome iron skin 26 and the heat storage chamber dome iron skin 36 are removed, and then the large-sized heavy machine 18 is used to attach the combustion chamber dome brick 24 and the heat storage chamber dome 32 of the heat storage chamber 30 to the heat storage chamber dome brick 34. Dismantle. Prior to this dismantling, a brick receiving deck (an example of a lid in the present invention) 42 is provided on the top end of the brick of the combustion chamber straight body portion 40.
Of the bricks in the heat storage chamber 30 and non-renovated bricks 3
A plug (not shown) for preventing the blockage of 8 is inserted into the canal hole of the non-renovated brick 38. When placing the brick receiving deck 42, an opening 28 is formed in the combustion chamber dome iron skin 26 and the combustion chamber dome brick 24 before the dome connecting pipe 12 is disassembled, and the brick receiving deck 42 is opened from this opening 28. Take in the parts and assemble. In this way, when the brick receiving deck 42 is placed on the top end of the brick of the combustion chamber straight body part 40, the dismantled combustion chamber dome brick 34 is received by the brick receiving deck 42, so that the burner in the lower part of the combustion chamber 20 is received. The brick 44 can be protected. The purpose of this brick receiving deck 42 is the following (1)-
(3). (1) Protecting diverted parts such as lower burner bricks (2) Easily discharging dome brick demolition debris (If dropped on burner bricks, it will interfere with the furnace deck 64 and cannot be mechanized) (3) Large heavy equipment When the working radius of 18 cannot cover the whole of the combustion chamber dome, brick waste is collected on this lid to form an oblique road, and it is possible to move to the combustion chamber side and dismantle all dome bricks. Due to the large difference between the installed height and the height of the checker brick upper end 50 of the heat storage chamber 30, the large heavy machinery 18
Cannot be moved, so the dismantled combustion chamber dome brick 34
Are stacked on the checker brick upper end 50 of the heat storage chamber 30 to form an inclined passage 52. By this passage 52, the large heavy equipment 18 can be moved to the checker brick upper end 50, and the heat storage chamber dome brick 34 in a range that cannot be disassembled by the large heavy equipment 18 placed on the bottom wall portion 13 can be disassembled. All the bricks 34 can be dismantled using the large heavy equipment 18. The large heavy machine 18 is generally called a power shovel, and functions as a hydraulic breaker by replacing the attachment at the tip.
The bricks 13a accumulated in the bottom wall portion 13 of the dome connecting pipe 12
The large heavy equipment 18 is used to process the brick 13a into the heat storage chamber 3
It is carried out by moving it to the 0 side and putting it in the discharge chute 60. Further, the large-scale heavy equipment 18 is also used to dismantle the bottom wall bricks.

Here, a plurality of discharge ports (not shown) are formed in the iron shells 20a, 30a of the combustion chamber 20 and the heat storage chamber 30 in the height direction, and the discharge chute 60 for discharging the demolished bricks to the outside. Is connected to the outlet. When disassembling the repair brick 54 in the heat storage chamber 30, the dismantling brick is started from the upper part of the repair brick 54 and the dismantled brick 6 is discharged.
Continue to dismantle the repair brick 54 while discharging it to the outside through 0. Dismantled heat storage room dome brick 34 also discharge chute 6
It is discharged to the outside through 0.

Next, with reference to FIG. 4, a method of dismantling the brick of the straight body portion 46 of the combustion chamber will be described. When dismantling the brick 48 of the combustion chamber straight body part 46 with a heavy machine, if the method of suspending the heavy machine with a gondola is adopted, the suspension wire will be an obstacle and cannot be disassembled with the heavy machine. Therefore, here, a method of using the in-furnace deck (an example of a mounting plate according to the present invention) 64 is adopted.

In the method using the in-furnace deck 64, first, holes are formed at predetermined intervals in the height direction and the circumferential direction in the iron skin 62 of the combustion chamber straight body portion 46 and the brick 48, respectively. Each of the pins 68a, 68b, 68c of a predetermined length,
By inserting 68d, the pins 68a, 68b, 68c, 68d are projected inside the combustion chamber 20. The in-furnace deck 64 on which the heavy equipment 70 is placed is suspended by the hoist 72, and a plurality of pins 68 at the uppermost stage are inserted in the circumferential direction.
a is supported. The hoist 72 is removed from the in-furnace deck 64, and the bricks 48 are dismantled by the heavy equipment 70, and the dismantled bricks are discharged to the outside through the discharge chute 60. When the dismantling work at the position of the furnace deck 64 supported by the plurality of pins 68a is completed, the pins 68a are pulled out, and the heavy machinery 7
The furnace deck 64 on which 0 is placed is suspended again by the hoist 72, and a plurality of pins 68 in the next stage are inserted in the circumferential direction.
The dismantling work is carried out in the same manner as described above while being supported by b. When this dismantling work is completed, the in-furnace deck 64 on which the heavy equipment 70 is placed is suspended again by the hoist 72 to be sequentially supported by the plurality of pins 68c and 68d, and the dismantling work is performed in the same manner as described above. Thus, the work of disassembling the brick 48 of the combustion chamber straight body portion 46 can be performed using a heavy machine.

Here, the pins 68a, 68b, 68
The interval for inserting c and 68d will be described. The circumferential interval may be an interval that can reliably support the in-furnace deck 64, and is determined by the size of the combustion chamber 20. If the distance in the height direction is long, the distance from the furnace deck 64 to the bricks 48 becomes long, and the demolished bricks may fall down on the heavy equipment 70, which is dangerous. Therefore, the interval in the height direction is set to 2.5 to 3.0 m, and the moving pitch of the furnace deck 64 is set to about 2.5 to 3.0 m. However, even if an attempt is made to form holes in the steel skin 62 and the bricks 48 at this interval, the existing deck outside the furnace, the pipe seat, etc. may be an obstacle. Therefore, as shown in FIG. 5, legs 64a, 64b having different heights are attached to the in-core deck 64, and pins 68a, 68b, 6 are attached.
For example, legs 64a are placed on 8c and 68d to support the in-core deck 64. When changing the height of the furnace deck 64, the furnace deck 64 is slightly lifted by the hoist 72 and rotated, and the legs 64b are placed on the pins 68 and the furnace deck 6 is moved.
Support 4. As a result, the height of the furnace deck 64 can be easily changed. As another method of changing the height, the hoist 72 is used to slightly lift the furnace deck 64 without rotating the furnace deck 64, and for example, the pins 68 supporting the legs 64a are extended into the furnace. Remove it. There is also a method of changing the height by inserting a pin 68 that supports the leg 64b and lowering the hoist 72 by a predetermined height.

Since the hot-blast stove bricks are dismantled by the dismantling method using a machine as described above, the dismantling work by human power is greatly reduced, and the heavy muscle work and the dangerous work are eliminated. Although the large heavy equipment and the small heavy equipment are used separately, the present invention is not limited to this and may be selected according to the size of the hot stove or the like. Furthermore, the case where the hot-air stove brick is partially disassembled has been described, but the present invention is not limited to this, and may be applied when disassembling all refractory materials.

[0016]

As described above, according to the hot-blast stove dismantling method of the present invention, in the case of dismantling all the bricks of the hot-blast stove or a part of the bricks, the capacity of the heavy equipment (heavy equipment) Size) and installation location can be easily changed,
Bricks that were conventionally dismantled by human power can be dismantled by mechanical force. Further, since it can be dismantled without using the blasting method, there is also an effect that the hot blast stove can be safely repaired while stopping the hot blast stoves one by one and continuing the operation of the blast furnace.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a method for disassembling a dome connecting pipe in a hot air stove disassembling method according to an embodiment of the present invention.

FIG. 2 is a schematic view showing a method for disassembling a dome brick for a heat storage chamber in the hot blast stove disassembling method according to an embodiment of the present invention.

FIG. 3 is a schematic view showing a method for disassembling bricks in a heat storage chamber in the hot blast stove disassembling method according to the embodiment of the present invention.

FIG. 4 is a schematic diagram showing a method of disassembling bricks in the direct trunk of a combustion chamber.

FIG. 5 is a perspective view showing a furnace deck.

[Explanation of symbols]

 10 Hot Stove 12 Dome Connection Pipe 13 Bottom Wall 14 Small Heavy Machine 18 Large Heavy Machine 20 Combustion Chamber 22 Combustion Chamber Dome 24 Combustion Chamber Dome Brick 26 Combustion Chamber Dome Iron Skin 30 Thermal Storage Room 32 Thermal Storage Room Dome 34 Thermal Storage Room Dome Brick 36 Thermal Storage Room Dome iron skin 38 Non-renovated bricks 40 Combustion chamber straight body part 42 Brick receiving deck 52 Passage 60 Discharge chute 64 In-core deck 68a, 68b, 68c, 68d Pin 70 Heavy machinery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Keiichiro Tokuda, Inventor 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (no address) Inside the Mizushima Steel Works, Kawasaki Steel Co., Ltd. (72) Taiko Furukawa, 1 Mizushima-kawasaki-dori, Kurashiki-shi, Okayama (No.) Kawasaki Steel Works, Mizushima Works (72) Inventor Katsumi Kameoka 2-11, Kandasudacho, Chiyoda-ku, Tokyo Kawatetsu Machinery Co., Ltd.

Claims (2)

[Claims] 1. A combustion chamber having a combustion chamber dome in an upper portion,
In a hot stove disassembling method for disassembling a hot stove having a heat storage chamber having a heat storage chamber dome in an upper portion and separated from the combustion chamber, and a dome connecting pipe connecting the combustion chamber dome and the heat storage chamber dome to each other, Dome connecting pipe dismantling step of removing the iron skin of the upper wall of the dome connecting pipe and dismantling the brick of the upper wall using a heavy machine, and removing the iron skin of each of the combustion chamber dome and the heat storage chamber dome After the iron skin removing step and the dome connecting tube dismantling step, a heavy machine is arranged on the bottom wall portion of the dome connecting tube from the disassembled part of the dome connecting tube, and the brick of the heat storage chamber dome is used by using the heavy machine. A dome disassembling step of disassembling at least a part of the bricks and the bricks of the combustion chamber dome, and bricks disassembled by forming a plurality of discharge ports in the iron shell of each of the combustion chamber and the heat storage chamber in the height direction The outside A discharge chute forming step of connecting a discharge chute to be discharged to the discharge port, and holes are formed at predetermined intervals in the height direction and the circumferential direction in each of the iron shell and the brick of the combustion chamber straight body portion, and the holes are respectively formed in the holes. By inserting a pin of a predetermined length, the pin is projected into the combustion chamber, and a mounting plate on which the heavy machine is mounted is supported by a plurality of pins inserted in the circumferential direction and sequentially lowered, and then the mounting plate is mounted. While dismantling the bricks of the combustion chamber with a heavy machine placed on a plate, a combustion chamber dismantling step of discharging the dismantled bricks to the outside through the discharge chute, and a brick dismantled in the dome dismantling step of the heat storage chamber By stacking the bricks on the brick wall, a path through which the heavy equipment arranged in the bottom wall portion of the dome connecting pipe moves to the heat storage chamber is formed, the heavy equipment is moved by the passage, and the heavy equipment moved is used to Heat storage room do The remaining part of the brick is disassembled, the brick in the heat storage chamber is started to be disassembled from the upper part of the brick, and the brick in the heat storage chamber is continuously disassembled while discharging the dismantled brick to the outside through the discharge chute. A hot-air stove dismantling method including a heat storage chamber dismantling step. 2. The dome connection pipe dismantling step removes the iron skin of the upper wall of the dome connection pipe, dismantles the brick of the upper wall using a heavy machine, and dismantles the brick to the dome connection. It is stored in the bottom wall of the pipe, and prior to the dome dismantling process, the top of the brick in the direct body of the combustion chamber is covered and the non-repaired brick of the heat storage chamber is closed. The hot air stove disassembling method according to claim 1, further comprising a blockage preventing step of inserting a plug for preventing into at least one of a canal hole at a lower end of the modified brick and a canal hole at an upper end of the unmodified brick.