JP2000063917A - Device for exchanging stave in blast furnace and method for exchanging stave in blast furnace using the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exchanging device of a stave in a blast furnace, with which the exchanging work of the stave in the blast furnace is completed in a short time because the works at the prestage and the poststage thereof are scarcely needed, and the reduction of working cost and the working safety can sufficiently be obtd. SOLUTION: A carry-in hole 26 and a carry-out hole 28A are arranged at the upper part of the furnace near the furnace top charging part 12. Then, two sets of chain blocks 34A, 34B are set so that the chains 34a, 34b hang down toward the conical outer peripheral surface 14a of a large bell 14 in the furnace top charging part from the upper part near the furnace center P in the furnace top charging part. Further, the chains 34a, 34b hung down on the conical outer peripheral surface of the large bell, are introduced to the lower side along the conical outer peripheral surface with chain swinging devices 38A, 38B and hung downward from the outer peripheral edge of the large bell and also, made swingable so that hooks 36a, 36b at the lower end can be freely shifted to the prescribed position in the inner wall of the furnace. Furthermore, in the carry-in hole and the carry-out hole, an auxiliary chain block 40 freely elevating/lowering an auxiliary chain 40a is disposed, too.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast furnace stave replacement device and a blast furnace stave replacement method using this device.

[0002]

2. Description of the Related Art In a stave-cooled blast furnace, when the refractory wall in the furnace is damaged due to the heat in the furnace or the influence of the charge in the furnace due to long-term operation, the blast furnace stave protecting the furnace shell is also damaged. Since the cooling capacity is likely to decrease, the repair work of replacing the blast furnace stave is regularly performed in order to extend the life of the blast furnace.

As a conventional technique for repairing the blast furnace, a prior art disclosed in, for example, Japanese Patent Laid-Open No. 9-118905 is known. This prior art is a process of lowering the blast furnace charge to a position lower than the damaged portion of the furnace wall after the blast furnace is blown off, and a step of lowering the blast furnace charge to a position lower than the damaged portion of the furnace wall and then the blast furnace charge. While filling the ore ballast to a predetermined height above, removing the cooling plate from the peripheral surface of the furnace wall, and slightly above the ore ballast filling portion of the furnace wall, a device for scraping out fragments of the furnace wall refractory is arranged. The upper opening,
A step of forming a lower opening for discharging the fragments scraped off by the scraping device to the outside of the furnace, and on the ore ballast-filled portion of the furnace wall, along the inner peripheral surface of the furnace wall, respectively, A step of arranging a plurality of furnace wall protectors whose side surfaces are inclined downward in a substantially annular shape, and after arranging the furnace wall protectors in the furnace, blast the furnace wall refractory, and debris thereof on the ore ballast. A step of dropping, a step of discharging the fragments from the lower opening of the furnace using the scraping device, and a step of scraping the fragments, and then carrying the blast furnace stave into the furnace from the upper opening to remove the fragments from the furnace wall. This is a technique including a step of attaching to the inner peripheral surface of, and a step of closing the upper and lower openings after scraping out the fragments.

According to this prior art, by using a scraping device in the vicinity of the upper opening formed slightly above the ore ballast filling portion of the furnace wall, the debris dropped on the ore ballast by blasting the furnace wall is used. The blast furnace stave was pushed out of the side opening to the outside of the furnace, and the blast furnace stave was carried into the furnace from the upper opening to be attached to the furnace wall.Therefore, the blast furnace stave was not attached to the blast furnace wall during a hot blast without stopping the blast furnace. Can be attached.

[0005]

However, in the above-mentioned prior art, the work of forming an upper opening portion having a large diameter for disposing the scraping device in the furnace wall, the furnace on the ore ballast filling portion of the furnace wall. A work of arranging the furnace wall protector in a substantially annular shape along the inner peripheral surface of the wall, a work of discharging debris and ore ballast generated by the blast from the lower opening to the outside of the furnace,
Since a lot of time is spent in the work before and after the blast furnace stave replacement work such as the work of closing the upper and lower openings, it is possible to finish the blast furnace stave replacement work in a short period of time. It is difficult and there is a problem in terms of work cost.

Further, since the dynamite is arranged in the furnace to explode the furnace wall refractory, there is a problem in work safety. Therefore, the present invention has been made by paying attention to the unsolved problem of the above-mentioned conventional example, and there is almost no need for pre-stage or post-stage work of the blast furnace stave replacement work, and the blast furnace stave replacement is performed in a short time. An object of the present invention is to provide a blast furnace stave replacement device that can complete work, reduce the work cost, and achieve sufficient work safety, and a method of replacing the blast furnace stave using this device.

[0007]

In order to achieve the above object, a blast furnace stave exchanging device according to claim 1 is for carrying a new blast furnace stave into the furnace near the top of the furnace. A device for exchanging blast furnace stave in a blast furnace provided with a carry-in inlet and a carry-out outlet for discharging a used old blast furnace stave out of the furnace, The lifting material lifting device installed such that the lifting lifting material is lowered toward the outer peripheral surface of the cone of the large bell in the furnace top charging section, and the lifting lifting material that has been lowered to the outer peripheral surface of the cone of the large bell After being guided downward along the outer peripheral surface, it is hung downward from the outer peripheral edge of the large bell, and the elevating suspension member along the conical outer peripheral surface is horizontally swung to hook the lower end of the elevating suspension material. Is movable to a predetermined position on the inner wall of the furnace A device provided with a suspending member swiveling device, and an auxiliary suspending member lifting device for arranging an auxiliary suspending member so that it can be raised and lowered toward the carry-in port and the carry-out port, and assisting the transfer of the blast furnace stave to the lift suspending member. is there.

According to a second aspect of the present invention, in the blast furnace stave exchanging device according to the first aspect, the suspending member swiveling device is fixed to an inner peripheral surface of a large cylindrical bell cup coaxially with the reactor core. The structure is such that it is suspended from the circular rail and turns along the circular rail.

According to a third aspect of the present invention, in the blast furnace stave exchanging device according to the second aspect, the suspension swing device is a support pulley that rolls on the annular rail, and a cone of the large bell. A first direction switching pulley that guides the elevating suspension material that has descended toward the outer peripheral surface downward along the conical outer peripheral surface, and the elevating suspension material that is supported by the first direction switching sheave is the large bell. The frame body is provided with a second direction switching pulley guided downward from the outer peripheral edge of the device and an attitude holding wheel that abuts on the inner peripheral surface of the large bell cup and holds the attitude of the entire apparatus.

Further, the invention according to claim 4 is the same as claim 1.
A method for replacing a blast furnace stave using the blast furnace stave replacement device according to claim 3, wherein the new blast furnace stave is loaded into the furnace at an upper part of the furnace near the furnace top charging part. A carry-in port is provided at one location, and two carry-out ports spaced apart from each other are provided on the opposite side of the carry-in port where the core is located symmetrically. The two suspension hanging devices are arranged so that the two lifting suspension members are lowered toward the outer peripheral surface of the cone of the large bell in the charging part, and the suspension carrying devices are carried in so that they do not cross each other. It is a method in which the old blast furnace stave and the new blast furnace stave are replaced by rotating the suspending member lifting device by rotating between the mouth and the carry-out port.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a blast furnace stave exchanging device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the internal structure of a stave cooling type blast furnace 10. Top part charging part 1 of this blast furnace 10
Reference numeral 2 denotes a two-bell type structure that includes a large bell 14 having a substantially truncated cone shape and a small bell 16 that is located above the large bell 14 and that is smaller than the large bell 14 and has a truncated cone shape. By moving downward, the lower part of the cylindrical small bell cup 17 opens, and by moving the large bell 14 downward, the lower part of the large cylindrical bell cup 15 opens, and the charging material is charged into the furnace. It has become so.

The blast furnace 10 has a blast furnace stave 1
In order to perform the replacement work of No. 8, the blast furnace is stopped by stopping the hot air supply from the tuyere 20 arranged at the lower part of the furnace, and the blast furnace charge 22 is lowered below the replacement position of the blast furnace stave 18. The ore ballast 24 such as iron ore and coke is filled on the blast furnace interposer 22.

Further, FIG. 2 shows the furnace top charging section 12 of the blast furnace 10.
FIG. 3 shows a detailed structure in the vicinity, and FIG. 3 is a view taken along the line III-III in FIG. 2, in which the upper part of the furnace near the furnace top charging section 12 communicates with the inside and outside of the furnace. A mouth 26 and a carry-out port are provided. Here, as shown in FIG.
Is one place, and two carry-out ports are provided on the opposite side of the carry-in port 26 with the core P as a symmetrical position (carry-out port 28A and carry-out port 28).
B) It is provided.

In the furnace top charging section 12, the old blast furnace stave 18 removed from the steel shell 19 is carried out to the outlets 28A, 28A.
A stave exchanging device 30 is installed to carry out the new blast furnace stave 18 carried into the furnace from the carry-in port 26 while being carried out from B to the outside of the furnace.

The stave exchanging device 30 includes a stave loading / unloading stage 32 that horizontally moves from the carry-in port 26 and carry-out ports 28A and 28B toward the inside of the core, and two units that are suspended above the large bell 14. Chain block 3
4A, 34B and these replacement chain blocks 34
The chains 34a, 34b, which have fallen on the conical outer peripheral surface 14a of the large bell 14 of A, 34B, are guided from the lower end of the conical outer peripheral surface 14a to the outside and then hung downward to bring the hooks 36a, 36b at the lower end of the chain to a predetermined height in the furnace. The chain turning device 3 for moving the hooks 36a, 36b to positions in the furnace in the circumferential direction by horizontally turning the portions of the chains 34a, 34b along the conical surface 14a.
8A and 38B, and an auxiliary chain block 40 that lowers the auxiliary chain 40a from the armor exchange port 39 provided at a predetermined interval in the circumferential direction of the furnace upper part toward the carry-in port 26, the carry-out port 28A, and the carry-out port 28B. Is equipped with.

The replacement chain blocks 34A, 34
B has long chains 34a and 34b wound around it, and is hung from two support members 42 fixed to the lower end of the small bell cup 17 so as to be spaced apart from each other.

Further, one chain turning device 38A is
A frame body suspended and supported by an annular rail 46 fixed coaxially with the core P at the center of the inner peripheral surface of the large bell cup 15, and as shown in FIG. 4, a horizontal frame fixed above the vertical frame 38a. A supporting pulley 38c which is disposed at the tip of the frame 38b and rolls on the upper portion of the annular rail 46, and a conical outer peripheral surface 14a of the large bell 14 at the lower end of the vertical frame 38a.
A first direction switch that guides the guide frame 38d fixed along a downward slope along the guide frame 38a and the chain 34a arranged at the upper end of the guide frame 38d and lowered to the outside in the radial direction of the conical outer peripheral surface 14a. The pulley 38e, a second direction switching pulley 38f that is arranged at the lower end of the guide frame 38d and guides the chain 34a downward, and the vertical frame 3
8a, which is disposed in the middle horizontal frame 38g fixed to the middle, and is provided with a posture holding wheel 38h that abuts against the inner peripheral surface of the large bell cup 15 so that the guide frame 38d maintains a state along the conical outer peripheral surface 14a. ing. Further, the other chain turning device 38B has the same configuration.

Reference numeral 4 installed on the upper part of the large bell 14
The member indicated by 2 is a work scaffold on which an operator rides to operate the stave changing device 30. Next, one embodiment of the replacement work of the blast furnace stave 18 using the stave replacement device 30 having the above configuration will be described.

First, the work of recovering the old blast furnace stave 18 is performed in the following procedure. The old blast furnace stave 18 to be recovered is removed from the iron shell 19 and dropped on the ore ballast 24 in the furnace.

Towards the old blast furnace stave 18 on the ore ballast, for example, the chain 34 of the chain block 34A
a is lowered, and the hook 36a is hooked on the old blast furnace stave 18.

After the old blast furnace stave 18 is lifted to a predetermined height by the chain block 34, the work scaffold 42 is
Worker of the chain swing device 38A in the direction S _{1 of} FIG.
Turn around.

The chain turning device 38A is attached to the carry-out port 28.
After moving to the position facing A, the old blast furnace stave 18 is carried out by the raising operation of the chain block 34A.
Lift to just below 8A.

The stave carry-in / carry-out stage 32 on the carry-out port 28A side is advanced to the inside of the furnace, and the auxiliary chain block 40 on the carry-out port 28A side is descended to remove the auxiliary chain 40a from the stave carry-in / carry-out stage 32. Hook on the blast furnace stave 18.

The old blast furnace stave 18 is pulled up onto the stave loading / unloading stage 32 by the raising operation of the auxiliary chain block 40. The stave loading / unloading stage 32 is retracted from the inside of the furnace, and the old blast furnace stave 18 is carried out of the furnace.

Further, the work of disposing the new blast furnace stave 18 in the furnace is performed in the following procedure. (a) Stave loading / unloading stage 32 on the loading port 26 side
The new blast furnace stave 18 is placed on top.

(B) The stave loading / unloading stage 3
2 is introduced into the furnace. (c) The auxiliary chain block 40 on the carry-in port 26 side is lowered, and the auxiliary chain 40a is hooked on the new blast furnace stave 18 on the stave carry-in / carry-out stage 32.

(D) The auxiliary chain block 40 is raised to slightly lift the new blast furnace stave 18 and retract the stave loading / unloading stage 32. (e) For example, the chain turning device 38A is turned to the carry-in port 26 side.

The lowering operation of the auxiliary chain block 40 is performed to position the suspended upper part of the new blast furnace stave 18 near the chain turning device 38A. (f) The stave loading / unloading stage 32 enters the furnace, and the worker on the stave loading / unloading stage 32 makes the hook 36a of the chain 36a of the chain block 34A.
Is hooked on the upper part of the new blast furnace stave 18.

(G) After removing the hook of the auxiliary chain 40a from the new blast furnace stave 18, the operator of the work scaffold 42 moves to the position S _{1 in} FIG. _The chain turning device 38A is turned in _two directions.

(H) By lowering the chain block 34A, the new blast furnace stave 18 is lowered to the height of the mounting position. Then, the worker in the furnace performs the work of mounting the new blast furnace stave 18 at the mounting position.

As shown in FIG. 3, the chain slewing device 38A on one side is used to replace the blast furnace stave 18 as described above.
In the range from the carry-in port 26 to the carry-out port 28A in the S ₁ direction and S
It is performed by turning in _two directions, and the other chain turning device 38
When B rotates in the range from the carry-in port 26 to the carry-out port 28B in the S ₃ direction and the S ₄ direction, the carry-out amount of the old blast furnace stave 18 and the carry-in amount of the new blast furnace stave 18 are increased to efficiently and efficiently carry out the blast furnace stave 18 Can be replaced.

Further, the chain turning devices 38A, 38B
Is a device that is suspended and supported by an annular rail 46 fixed to the central portion of the inner peripheral surface of the large bell cup 15, and a supporting pulley 38c rolls on the annular rail 46 to perform a turning operation. Arrangement work or removal work from the furnace can be performed easily.

Moreover, the chain turning devices 38A, 38B
Is a supporting pulley 38c that rolls on the annular rail 46, a chain 34a that descends from above, and a first direction switching pulley 38e that guides 34b radially outward of the conical outer peripheral surface 14a of the large bell 14. , A second direction switching pulley 38f that guides the chain 34a below the large bell 14 and the large bell cup 15
Since the frame body has a simple structure including only the attitude holding wheel 38h that holds the attitude by contacting the inner peripheral surface of the device, the cost of the device can be significantly reduced.

Therefore, in this embodiment, unlike the conventional blast furnace stave replacement work, the work at the pre-stage and the post-stage of the replacement work is hardly required, and the blast furnace stave replacement work can be completed in a short time. In addition, it is possible to reduce the working cost and the device cost, and further, since there is no dangerous work such as blasting work, it is possible to sufficiently work safety.

In this embodiment, the old blast furnace stave 1 is used.
8 and the chain blocks 34A, 34B and the auxiliary chain block 40 were used as the device for suspending the new blast furnace stave 18, but these are not limited to the gist of the present invention. For example, a wire winding device using a wire may be used. However, the same effect can be obtained.

[0037]

As described above, according to the blast furnace stave exchanging device according to the first aspect of the present invention, unlike the conventional blast furnace stave exchanging work, there is almost no need for the pre-stage or post-stage exchanging work, which is short. It is possible to complete the work of replacing the blast furnace stave in a time, and since there is no dangerous work such as the blast work, it is possible to achieve sufficient work safety.

Further, according to the blast furnace stave exchanging device of the second aspect, since the suspending member swiveling device is a device which is suspended and supported by an annular rail fixed to the inner peripheral surface of the large bell cup to perform a swiveling operation, The placement work in the furnace or the removal work from the furnace can be easily performed, and the work cost can be reduced.

According to the blast furnace stave exchanging device of the third aspect, the suspension swinging device has a simple structure including a supporting pulley, first and second direction switching pulleys, and an attitude holding wheel. Since it is a frame body, the cost of the device can be reduced.

Further, according to the method of exchanging a blast furnace stave according to a fourth aspect of the present invention, the suspending material lifting device moves the blast furnace stave while one suspending material swiveling device swivels between the carry-in port and the one carrying-out port. , If the other lifting material turning device turns the loading material from the loading port to the other loading port while the blast furnace stave is replaced by the lifting material lifting device, the loading amount of the old blast furnace stave and the loading amount of the new blast furnace stave increase. The blast furnace stave replacement work can be performed with high efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing a stave cooling type blast furnace according to the present invention.

FIG. 2 is a diagram showing details of a furnace top charging section of the blast furnace according to the present invention.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a perspective view showing a specific configuration of a suspension swing device according to the present invention.

[Explanation of symbols]

12 Furnace top charging section 14 large bell 14a Conical outer peripheral surface 15 large bell cups 18 Blast furnace stave 26 carry-in entrance 28A, 28B carry-out exit 34a, 34b Chain (elevating suspension material) 34A, 34B Chain block (Suspension lifting device) 36a, 36b hook 38A, 38B chain turning device (suspension material turning device) 38c support pulley 38e First direction switching pulley 38f Second direction switching pulley 38h Posture holding car 40 Auxiliary chain block (auxiliary suspension lifting device) 40a Auxiliary chain (auxiliary hanging material) 46 ring rail P core

Claims (4)

[Claims] 1. An inlet for loading a new blast furnace stave into the furnace and an outlet for discharging a used old blast furnace stave out of the furnace near the top of the furnace. A device for replacing a blast furnace stave in a blast furnace, which is installed such that the lifting suspending member is lowered from above the core of the furnace top charging section toward the outer peripheral surface of the cone of the large bell in the furnace top charging section. With the lifting material lifting device, and the lifting lifting material that has come down to the outer peripheral surface of the cone of the large bell, and led downward from the outer peripheral edge of the large bell after guiding it downward along the outer peripheral surface of the cone, A suspending member swivel device that horizontally swivels the elevating suspending material along the outer peripheral surface of the cone to move the hook at the lower end of the elevating suspending material to a predetermined position on the inner wall of the furnace, and the carry-in port and the carry-out port. Auxiliary suspending material is arranged so that it can be raised and lowered freely. Changer blast furnace stave, characterized in that and a supplementary suspension member lifting device for assisting in delivery of the blast furnace stave to lift suspended material. 2. The suspension swinging device is structured to be suspended from an annular rail fixed coaxially with the core on an inner peripheral surface of a large cylindrical bell cup and to be swung along the annular rail. The blast furnace stave replacement device according to claim 1, wherein: 3. A support pulley that rolls on the annular rail of the suspension swing device, and the lifting suspension that descends toward the cone outer peripheral surface of the large bell along the cone outer peripheral surface. A first direction switching pulley for guiding downward, a second direction switching pulley for guiding the lifting suspension member supported by the first direction switching pulley downward from an outer peripheral edge of the large bell, and a large bell cup. The blast furnace stave replacement device according to claim 2, wherein the blast furnace stave replacement device comprises a frame body that is provided with an attitude holding wheel that abuts against an inner peripheral surface of the apparatus and holds the attitude of the entire apparatus. 4. A blast furnace stave replacement method using the blast furnace stave replacement device according to claim 1, wherein a new blast furnace stave is provided at an upper part of the furnace near the furnace top charging part. Is provided at one place for loading the gas into the furnace, and is separated from each other on the opposite side of the loading port with the core as a symmetrical position.
Two carry-out ports are provided, and two lifting suspension members are hung so that two lifting suspension members are lowered from above the core of the furnace top charging section toward the outer peripheral surface of the cone of the large bell in the furnace top charging section. A material swirling device is provided, and the suspending material swiveling devices are swung between the carry-in port and the carry-out port so as not to intersect with each other, and the suspending material lifting device operates to operate the old blast furnace stave and the new blast furnace. A blast furnace stave replacement method, characterized in that stave replacement work is performed.