JPH068989Y2 - Replacement device for inner wall cooling device of bellless blast furnace - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is designed to cool a bell panel in a bellless blast furnace from the lower part of the shaft to the upper part of the shaft, when the refractory wall and stave cooler are damaged or fallen off. The present invention relates to a replacement device that takes a stave cooler or the like into a furnace and attaches it to a damaged or dropped portion.

(Prior art and its problems) Cooling equipment for refractory linings and staves in blast furnaces cause cracks and peeling due to friction due to descent of the charging material, fluctuations in heat load inside the furnace, and erosive gas attack. Easily lost due to wear and tear. For this reason, the profile in the furnace becomes extremely non-uniform, a mixed layer of coke and sinter is generated, and the flow path of the reducing gas in the furnace becomes non-uniform, which is a serious problem in terms of operational stability.
Generally, in blast furnace operation, the stave cooler installed in the lower part of the shaft and belly part has a higher heat load in the furnace than the other parts after the brick wall is worn out and dropped.
The progress of wear is fast, which causes the heat load in the furnace to act on the furnace shell, resulting in hot spots on the furnace shell.
Deformation and cracks will occur, and problems such as gas leakage will occur, and this will greatly affect the life-determining rate of the reactor, so it is necessary to replace the stave cooler.

In the brick section on the upper part of the shaft, spray irregular shaped refractory from the inside of the furnace on the front surface of the remaining brick refractory, install fired refractory panel or water cooling panel, etc. to repair the furnace profile on the upper part of the shaft and furnace wall. Measures and methods such as cooling recovery are taken.

Of these, the replacement of worn staves, which are attached to a portion where the heat load in the furnace is high and are large both in terms of quantity and unit weight, are roughly divided into the following two methods.

<Method A> After completely stopping the blast furnace operation and cooling the furnace body, the worker enters the furnace to remove the contents inside the furnace, and then creates a scaffolding inside the furnace to remove the worn stave cooler from outside the furnace. After pushing it out into the furnace with a hydraulic jack and removing it, the stave cooler to be replaced from the furnace body skin opening at the top of the shaft is suspended at a predetermined place in the furnace using a lifting wire rope and pulled from the outside of the furnace to install. It is a fixed method.

This method is generally used for blast furnace repair work, and other methods that involve workers inside the furnace are difficult for safety reasons.

<Method B> The method disclosed in Japanese Patent Laid-Open No. 60-9810,
This will be described with reference to FIG.

After the blast furnace was blown off during reduced-scale operation, as shown by A in FIG. 3, the hydraulic stave cooler 1 was worn from outside the furnace by a hydraulic jack 13.
0 is pushed into the furnace and pushed down onto the scale 12, and as shown by B in FIG. 3, the lifting wire rope 7 and the guide wire rope 9 are moved from the furnace top opening 4 to a predetermined level in the furnace. The furnace shell 1 and the wear stave cooler 10 are gas-opened together so that the wear stave cooler 10 can be suspended by the respective winches 6 and 8, and the lifting wire rope 7 is pulled from the outside of the furnace and fixed, and then the outside of the furnace Push it out into the furnace with the hydraulic jack 13 and remove it. After that, the furnace top opening 4
This is a method in which the stave cooler 11 to be replaced is suspended by the elevating wire rope 7 and the guide wire rope 9 to a predetermined level and a predetermined position, and is pulled from the outside of the furnace to the furnace body skin 1 side for mounting and fixing.

This system has the advantage that the stave cooler can be replaced after the wind has been shut down during reduced-scale operation, but the gas collection mantel 2 has the gas collection pipe 3 and so on, so the stave cooler can be taken out and taken in. Such a furnace top opening 4 can be installed only in 4 to 8 places, and it is provided in the furnace circumferential direction of the shaft part.
To replace ~ 60, 5-6 stages of stave cooler, 4 ~ 8 limited furnace top openings 4 provided in the gas collection mantel 2 can be installed in a lower circumferential direction up to about 20 m. Positioning each stave cooler is a very difficult task. For this reason, in order to position the stave cooler in a predetermined circumferential direction, a lifting wire rope 7 that suspends the stave cooler to a predetermined level and a guide wire rope 9 that positions the circumferential direction are inserted from separate furnace top openings 4. Then I have to suspend it. And this work,
It is necessary to repeat this while sequentially changing the position of the furnace top opening 4 for each stave cooler in the circumferential direction. not to mention,
Even though it is a work during a blast, the workers are exposed under the environment where the toxic gas rising from the scale 12 diffuses out of the furnace through the furnace top opening 4 that suspends the lifting wire rope 7 and the guide wire rope 9. Is to wear an air line mask or the like to perform the positioning of the wire rope and the replacement of the stave cooler, which is a problem in terms of safety work.

As described above, the conventional method has various problems. this is,
If the blast furnace reaches the level where the refractory inside the furnace wall and the stave cooler are worn out and the iron skin is exposed, conventional repair is premised.
This is because a useful cooling device (stave cooler) replacement method was not considered. Even the above-mentioned methods A and B have been considered recently, and the soil for which a blast furnace with a structure devised for maintaining the furnace body of the blast furnace is proposed has not yet been cultivated by those skilled in the art. Is the current situation. In addition,
Reference numeral 5 in FIG. 3 indicates a furnace body inspection deck.

In Japanese Patent Publication No. 57-47729, an arm device for swiveling, expanding and contracting, and raising and lowering is temporarily installed in the center of the furnace at the top of the blast furnace, and an ore deposit is hung at the tip of this arm device. , A method of rotating the arm device, expanding and contracting, raising and lowering it to replace the ore deposit and the new ore deposit installed in the circumferential direction in the upper part of the furnace is disclosed, but this method is installed at the furnace mouth. Is a method of exchanging ore deposits.
In the arm device disclosed in Japanese Patent Publication No. 477729, since the expansion and contraction amount and the elevation amount are limited, it cannot be used to replace a cooling device such as a stave cooler installed from the lower part of the shaft to the upper part of the shaft.

In view of the present situation, the present invention solves the drawbacks of the conventional method. That is, in the present invention, in a bellless blast furnace, when the cooling plate or stave cooler provided on the iron skin as a cooling device on the shaft, the lower part or the belly part is worn, the cooling device is planned to be replaced in order to maintain the furnace body. ,
To provide a replacement equipment that can be added or replaced by replacing the fired fireproof panel or water cooling panel etc. for the purpose of repairing the profile of the furnace wall by removing the unevenness of the damaged furnace wall refractory surface at the top of the shaft. To aim.

(Means for Solving the Problem) In order to achieve the above object, a replacement device for an inner wall cooling device of a bellless blast furnace according to the present invention is a device for replacing an inner wall cooling device installed in a bellless blast furnace equipped with a distribution chute. The distribution chute has a fitting portion having the same shape as the distribution chute, and the swivel suspension beam is attached instead of the distribution chute, and the hoist device is provided at the tip of the swivel suspension beam.
This hoisting device is equipped with a lock mechanism that locks the tilting so that the tilting system gear part is not burdened when a load is applied, and has only a turning function, and a combination of the turning operation of the turning suspension beam and the lifting operation of the hoisting device. Due to
The furnace inner wall cooling device can be replaced at any level and in any direction inside the furnace from the lower part of the shaft to the upper part of the shaft.

(Function) The present invention has the above-described structure, the raw material charging distribution chute is removed, the swivel hanging beam is attached, and the inner wall cooling device is incorporated through the distribution chute replacement opening installed in the gas collecting mantel. , The hoisting device installed at the tip of the swivel hoisting beam is suspended, and the swivel operation of the swivel hoisting beam is performed by remote control, and the inner wall cooling device is suspended by the hoisting device ascending / descending operation to any given level and orientation in the furnace. It becomes possible.

(Embodiment) The present invention focuses on the structure and function of a bellless blast furnace equipped with a distribution chute (not shown) for charging the raw material in the furnace. 23, and a hoist device 24 is installed at the tip portion 23-2 thereof to provide a replacement device having swiveling and elevating functions.

Hereinafter, the present invention will be described in order based on an embodiment shown in FIG. 1 and FIG.

a. The furnace interior container 12 'is so-called reduced in size to damage the furnace wall 17
The air is exposed to rest and the lid of the distribution chute replacement opening 30 installed in the gas collection mantel 2 is removed.

b. Next, the distribution chute is removed from the fitting portion of the distribution chute drive device 22 using the distribution chute replacement hoist 27.

The drive device 22 for the distribution chute imparts a swirling and tilting function to the distribution chute so that the raw material can be charged into an arbitrary position in the furnace, and is installed on the furnace axis. The charging raw material is
After being charged into the hopper unit 21 by the charging conveyor 20 and being equalized with the pressure inside the furnace, it is charged into the furnace through the distribution chute drive device 22 and the distribution chute.

c. In the reverse order of removing the distribution chute in the item b, the distribution chute replacement hoist 27 is used to fit the swivel suspension beam 23 having the fitting portion having the same shape as the distribution chute into the distribution chute drive device 22. Attach to the joint (state "a" in the figure).

d. Next, in this "a" state, the swing suspension beam 23
After the hoist device 24 is attached to the tip of the hoist device, the turning suspension beam 23 turns to a state of "b" at a predetermined tilt angle θ that does not interfere with the furnace inner sowing pipe, etc.
The distribution chute drive device 22 is used for tilting, and a tilting lock is performed by a mechanical stopper (not shown) so that the tilting system gear portion is not burdened when the hoist device 24 suspends the stave cooler 11 and the like.

e. On the other hand, the wear stave 10 is pushed into the furnace by a hydraulic jack 13 or the like from the furnace outer side furnace body inspection deck 5'of the furnace body iron skin 1 and is pushed down to the upper part of the reduced-scale furnace interior container 12 '. In this way, the worn stave cooler 10 is sequentially removed for each stage. Reference numeral 10 'denotes a worn stave cooler that is pushed down onto the furnace interior container 12'.

f. Next, the new replacement stave 11 is installed on the top trolley 2
According to No. 6, it is transported from the ground to above the furnace top deck 29. (State "A" in the figure).

g. After that, in order to take in a new replacement stave cooler 11 to the inside of the furnace, suspend it on the distribution chute replacement hoist 27 (“B” state), and attach the guide wire rope 14 to the end of the stave cooler cooling pipe or the like. Then, it is introduced into the furnace through the distribution chute replacement opening 30 (in the state of “C”), and further suspended by the hoist device 24 attached to the tip of the swivel suspension beam 23.

h. The swivel suspension beam 23, which suspends the new replacement stave cooler 11, swivels and stops to a predetermined azimuth position by the swiveling operation of the distribution chute drive device 22, and then the hoist device 24 moves up and down to lift the shaft from the lower shaft to the upper shaft. The new replacement stave cooler 11 is hung up to an arbitrary predetermined level in the furnace (state "D").

i. Next, the worker on the furnace body inspection deck 5 ′ is pulled by the pulling rod 1
6 is inserted through the opening of the furnace body iron shell 1, and the replacement stave cooler 11 is attached and fixed to the new stave cooler 11 which has come to a predetermined position (state "E").

Similar to the above-mentioned method of replacing the worn stave cooler 10, the unevenness of the damaged furnace wall refractory surface on the upper part of the shaft is eliminated, and a fired refractory panel, a water cooling panel 15 or the like is added or replaced for the purpose of restoring the profile in the furnace. (“C” state).

In addition, 18 shows a furnace wall profile at the time of soundness.

Next, the swivel suspension beam 23 will be described in detail with reference to FIG.

The swivel suspension beam 23 is for removing the distribution chute and using it as a suspension beam.
It is needless to say that a lightweight and highly rigid structure is desirable in order to suspend a stave cooler having a predetermined weight in view of the mechanical strength of 2. The engaging portion with the drive device 22 for the distribution chute, that is, the fitting portion 23-1 of the orbiting suspension beam 23 has the same shape as the fitting portion of the distribution chute, and the hoist device 24 is attached to the tip portion. Hoist hanging part 23-
2, the pin 23-3 is provided. In addition, tilting (“a”) with the hoist device 24 installed at the tip of the swivel hanging beam 23 so that the length of the swivel hanging beam 23 reaches near the inner wall of the furnace mouth.
In the “b” state), the distribution chute replacement opening 30
It is desirable to be as long as possible without interfering with.

An electric chain block, an electric wire hoist, an air hoist, or the like can be used as the hoist device 24 attached to the tip end of the orbiting suspension beam 23. However, since it is necessary to suspend the stave cooler diagonally, wire rope squeezing and drum irregular winding are required. Adoption of an electric chain block is desirable to avoid troubles. Even though the stave cooler replacement work, etc., is performed during a period of rest, the hoist device 24 is exposed to the hot rising gas from the furnace interior container 12 'and the radiant heat from the furnace inner wall. It is better to use a mold.

The hoist device 24 is connected to a lifting operation pendant switch 24-1 and a power supply cable 24-2.
In FIG. 2, 24-3 is a hoist chain bucket, 25
Indicates a hoist chain.

(Effects of the Invention) As described above, the present invention focuses on the swiveling and tilting motion functions of the drive device for the distribution chute of the bellless blast furnace equipped with the distribution chute. A swivel suspension beam is attached to the shaft, and a hoist device is installed at the tip of the beam to easily replace the damaged stave cooler from the lower part of the shaft to the upper part of the shaft in the furnace at any level and in any direction by remote control. Therefore, as in the conventional method, 4 to 4 provided in the gas collection mantel
It is not necessary to repeat the replacement of each stave cooler on the inner circumference of the furnace with the winch and the wire rope through the eight limited openings while sequentially suspending the operations.

Further, as described above, since the present invention is a simple replacement device by combining the swivel hanging beam and the hoist device, replacement with the distribution chute can be performed in a short time by the distribution chute replacement hoist and chute replacement device. Can be installed. Therefore, unlike the conventional method, it is not necessary to install several winches on the furnace body inspection deck and to perform complicated preliminary setup work such as wire rope stretching around before and after the stave cooler removal safely in a short time. It is possible to perform replacement work, etc., which also shortens downtime and saves costs, which can greatly contribute to extending the life of the blast furnace and stabilizing the furnace condition.

[Brief description of drawings]

FIG. 1 is an explanatory view of the device of the present invention, FIG. 2 is an enlarged perspective view of a main part thereof, and FIG. 3 is a conventional explanatory view. Reference numeral 23 is a swing suspension beam, 23-1 is a fitting portion of 23, and 24 is a hoist device.

Claims (1)

[Scope of utility model registration request] 1. A device for replacing an inner wall cooling device installed in a bellless blast furnace having a distribution chute, which has a fitting portion having the same shape as that of the distribution chute, and a swivel hanging beam mounted in place of the distribution chute. , A hoist device disposed at the tip of the swivel suspension beam, and the hoist device is provided with a lock mechanism for locking the tilt so that the tilting system gear portion is not burdened when a load acts on the hoist device. It is characterized in that the furnace inner wall cooling device at any level and in any direction inside the furnace from the lower part of the shaft to the upper part of the shaft can be replaced by a combination of the swiveling operation of the swivel suspension beam and the lifting operation of the hoist device. Replacement device for the inner wall cooling device of the bellless blast furnace.