JP2001131617A - Method for repairing blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing method of a blast furnace, by which the furnace bottom part can easily be renewed in a short time. SOLUTION: (1) In the method for renewing into new furnace bottom part 12 after separating the furnace bottom part from the furnace body of the blast furnace, (a) a furnace bottom base board 13 is set on plural laying beams 14 and further, a new furnace bottom part 12 is set on the furnace bottom base plate 13, and (b) a hydraulic pressure lifting mechanism R provided with a moving means is put between the laying beams 14 and (c) the new furnace bottom part 12 is lifted by raising the hydraulic pressure of the hydraulic pressure lifting mechanism R to be separated from a conveying table 17, and (d) the new furnace bottom part 12 is set to prescribed position by a moving means of the hydrulic pressure lifting mechanism R. (2) The constitution of the moving means is rolling-contact rollers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for repairing a blast furnace, and more particularly to a method for repairing a furnace bottom.

[0002]

2. Description of the Related Art Conventionally, refurbishment of a blast furnace involves dismantling of a furnace body,
The refurbishment of the blast furnace requires a long period of about 3 to 4 months, and the refurbishment of the blast furnace takes the shortest time in terms of securing production volume. There is a strong demand for implementation.

[0003] Furthermore, the number of operating blast furnaces is decreasing, and there are many steel mills operating single blast furnaces, and there is a strong demand that blast furnaces be repaired in a short time without a spare blast furnace. In fact.

[0004] A repair technique has been established for the shaft portion of the blast furnace, which allows the cooling device such as a refractory to be sprayed or a stave to be replaced by a cold wind, and there is no particular problem.

However, the furnace bottom has no repair technology and is a neck part that determines the life of the blast furnace.

[0006] Various methods for repairing the furnace bottom have been proposed. For example, Japanese Patent Publication No. 53-39322 discloses that a blast furnace is divided into several blocks from the furnace top to the furnace bottom, and the blast furnace body is constructed outside the base except for the base of the blast furnace body. A method has been proposed in which each divided block is transported onto a blast furnace part, and each divided block is sequentially assembled from a furnace top part by a so-called lift-up method, and finally, the furnace bottom part is fixed on a blast furnace body foundation together with a furnace bottom surface plate.

In Japanese Patent Application Laid-Open No. 5-222420, a fluid film of compressed gas is formed between the furnace bottom and the blast furnace base, and the furnace bottom is horizontally held by a hydraulic jack via the fluid film. In the state, reduce the movement resistance when moving,
A blast furnace repair method for replacing the furnace bottom has been proposed.

Further, Japanese Patent Application Laid-Open No. Hei 9-143521 discloses that a furnace body of a blast furnace is divided into a plurality of ring-shaped blocks, each of which is constructed at a place other than the base part of the blast furnace, and then sequentially transported onto the base part of the blast furnace. A method of sequentially joining from the furnace top by a lift-up method has been proposed.In particular, for a furnace bottom block bricked on a furnace bottom plate, a new furnace bottom block is slid and moved on a blast furnace base, and the upper block is A method of renovating the combined blast furnace has been proposed.

[0009]

However, in the carrier disclosed in Japanese Patent Publication No. 53-39322, which also serves as a bottom plate, each carrier block is transported and then the bottom block is loaded. Since it is fixed on the blast furnace base as it is, there is a problem that it cannot be reused as a carrier.

The method disclosed in Japanese Patent Application Laid-Open No. 5-222420 shows how to install a fluid levitation device for forming a fluid film and a hydraulic jack for horizontally holding the furnace bottom. Therefore, there is a problem that it is difficult to actually apply.

[0011] Furthermore, the method disclosed in Japanese Patent Application Laid-open No. Hei 9-143521, in which a furnace bottom block of a heavy load having a mass of 3000 tons or more is moved by sliding and installed on a blast furnace base, is disclosed in Japanese Patent Laid-Open No. 9-143521. There is a problem that the coefficient of friction between the metal and the sliding plate at the lower part of the furnace bottom is large and a large traction force is required, so that the practicability is poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blast furnace refurbishment method capable of easily renewing a furnace bottom in a short time.

[0013]

SUMMARY OF THE INVENTION We have a mass of about 30.
A practically applicable means capable of moving the furnace bottom of a blast furnace, which is a super-heavy material of 00 to 4000 tons, is studied, and a mechanism that can easily raise the furnace bottom using fluid pressure (hereinafter referred to as a fluid pressure lift mechanism) ), The following findings were obtained.

(A) The hydraulic lift mechanism controls the fluid pressure so that the lifting height is low, but a large lifting force can be developed with a small pressure.

(B) By providing the hydraulic pressure lift mechanism with a moving means and performing the following methods (a) to (e),
The furnace bottom prepared in advance can be easily moved to an arbitrary place.

(A) A laying beam is placed on a transfer table provided with a moving device, a hearth plate is placed above the laying beam, and a furnace bottom is newly constructed or repaired on the hearth platen. I do. Hereinafter, a newly constructed or repaired furnace bottom is referred to as a new furnace bottom.

(B) After moving the carrier to a predetermined position, a hydraulic lift mechanism having a moving means is provided between the spread beams.

(C) The structure of the moving means may be, for example, a rolling roller and a rigid flat plate that supports the rotation of the rolling roller.

(D) The bottom of the new furnace is separated from the carrier by raising the bottom of the new furnace by using a fluid pressure lift mechanism, and if the bottom of the new furnace is pulled using the above-mentioned rolling rollers as moving means, a small size is obtained. It can be easily moved to a predetermined position by traction.

The new furnace bottom may be manufactured on a manufacturing table adjacent to the blast furnace without using a transfer table equipped with a moving device.

The present invention has been made based on the above findings, and the gist is as follows.

(1) In the method of separating the furnace bottom from the blast furnace body and renewing it to a new furnace bottom, (a) installing a furnace bottom plate on a plurality of spreading beams, (B) placing a hydraulic lift mechanism with moving means between the spread beams and the spread beam;
By raising the fluid pressure of the hydraulic lift mechanism, the new furnace bottom is raised, the carrier and the new furnace bottom are separated, and (d) the new furnace bottom is moved to a predetermined position by the moving means of the hydraulic lift mechanism. A method of refurbishing a blast furnace, wherein the method is arranged in a blast furnace.

(2) In the method of separating the furnace bottom from the blast furnace body and renewing the furnace bottom to a new furnace bottom, (a) placing a plurality of spreading beams on a transfer table provided with a moving device; A furnace bottom plate is placed on the beam, and a new furnace bottom is placed on the furnace bottom plate. (C) After moving the carrier on which the new furnace bottom is mounted to a predetermined position, Between the laying beam and the laying beam, place a fluid pressure lift mechanism with a moving means,
(E) raising the fluid pressure of the hydraulic lift mechanism to raise the new furnace bottom, separating the transfer table and the new furnace bottom, and (f) moving the new furnace bottom by moving means of the hydraulic lift mechanism. A blast furnace repair method, wherein a blast furnace is arranged at a predetermined position.

(3) The method for repairing a blast furnace according to the above (1) or (2), wherein the structure of the moving means is a rolling roller.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention using a carrier provided with a moving device will be described. FIG. 1 (a), (b)
FIG. 1A is a conceptual view of one embodiment of a hydraulic lift mechanism for explaining the principle of a hydraulic lift mechanism. FIG. 1A shows a case where no fluid pressure is applied, and FIG. Is the case.

The fluid pressure lift mechanism has a structure in which a flexible flat hose-shaped air bag 3 is inserted between an upper frame 1 and a lower frame 2 shown in FIG. When a fluid having a pressure P is introduced, a rising force F is generated according to the value of the pressure P, and the rising stroke S of the upper frame 1 can be controlled.

For example, an air bag 3 having an inner diameter of 165 mm
When the contact width B between the airbag 3 and the upper frame 1 becomes 0.1 m, the rising force F per 1 m of the length of the airbag 3 becomes 70 m.
kN (0.1 mx 1 mx 0.7 MPa).

For example, when the weight of the furnace bottom is about 40 MN (mass: 4000 tons), in order to raise the furnace bottom with air at a pressure of 0.7 MPa, the total length of the air bag 3 is set to about 570 m (40 MN). / 70 kN / m).

FIG. 2 is a longitudinal sectional view conceptually showing an example of a method of separating the blast furnace body from the furnace bottom.

As shown in FIG. 2, the blast furnace furnace body 4 suspended on the furnace body support bracket 8 by the hydraulic jack 7 installed on the beam 6 of the furnace body turret 5 has a furnace bottom 9 in a range indicated by oblique lines in the figure. The upper surface portion 10 is cut in the horizontal direction, and the furnace bottom 9 is further separated by cutting the upper surface of the blast furnace base 11 below the furnace bottom 9 in the horizontal direction.

If the separation distance between the blast furnace furnace body 4 and the furnace bottom 9 is about 100 mm, there will be no problem in the installation operation of the new furnace bottom described later. The separation distance can be adjusted using the hydraulic jack 7.

FIGS. 3 (a) and 3 (b) show an embodiment of the present invention, and are conceptual diagrams showing the relationship between the bottom of the new furnace and the transfer table, and FIG. FIG. 3B is a plan view, and FIG. 3B is a longitudinal sectional view.

The transfer table 17 shown in the figure may have any structure as long as it can move a super heavy object (mass: about 3000 tons or more) to an arbitrary place.

That is, the transfer table 17 may be a rigid structure in which the moving device 18 is provided below the transfer table, and the moving device 18 is supported by the transfer frame 24. Moving device 18
Can be a unit dolly or the like.

On the upper surface of the carrier 17, a new furnace bottom 12 is installed on a furnace bottom plate 13 via a spreading beam 14. The new furnace bottom 12 may be newly constructed or repaired as described above.

Further, the new furnace bottom portion 12 may be manufactured on the transfer table 17 or may be transferred and installed at another place.

The laying beam 14 supports the load on the bottom plate 13 and the new bottom 12 on the carrier 17 and is preferably installed parallel to each other.
It is determined based on the moving direction of the new furnace bottom 12.

The laying beams 14 are preferably placed parallel to each other, but need not be equally spaced. However, in order to uniformly support a super-heavy object, equal intervals are preferable.

In the illustrated example, the installation interval L and the height H of the spread beams 14 may be determined based on the set size of the hydraulic lift mechanism disposed between the spread beams 14 parallel to each other.

The cross-sectional shape of the spread beam 14 is
In order to support the load of the super heavy object of the hearth platen 13 and the new hearth part 12 above, a rectangle is preferable as shown in FIG. The material of the spreading beam 14 is preferably a steel structure filled with concrete or the like so as to form a structure having high rigidity.

Furnace bottom plate 13 installed on spread beam 14
It is preferable that a structure having high rigidity is used so that bricks built in the new furnace bottom during transfer of the new furnace bottom 12 are not warped or distorted and joints or cracks are not generated.

FIGS. 4 (a), (b), (c), (d)
A method according to an embodiment of the present invention, in which a hydraulic lift mechanism provided with a moving means is inserted between a spread beam supporting a bottom platen located at a lower portion of a new furnace bottom and a spread beam, and the new furnace bottom is moved. FIG. 4A is a conceptual diagram showing a state in which a beam, a hearth plate and a new hearth are mounted on a carrier.
4B shows a state in which the fluid pressure lift mechanism is inserted between the spread beams, and FIG. 4C shows a state in which the fluid pressure of the fluid pressure lift mechanism having the moving means is increased. Shows a state in which the bottom plate and the new bottom are moved to the bottom base by the moving means, and then the pressure of the fluid pressure lift mechanism is lowered to land on the bottom base.

The following is an example of a method for moving the bottom of a new furnace.

(1) As shown in FIG.
7, the spread beams 14 having the height H are arranged in parallel with each other at equal intervals L in a getter shape, and the bottom platen 13 and the new bottom 12 are further mounted on the spread beams 14. , A space A is formed.

(2) As shown in FIG.
A hydraulic lift mechanism R equipped with a moving means is inserted into the space A between the spreading beams 14 on the floor 7.

The hydraulic lift mechanism R has already been schematically described with reference to FIG.
, A flat hose-shaped air bag 3 provided between the lower frame 2 and a rolling roller 20 serving as moving means provided below the lower frame 2.
And a rolling roller frame 21 and a liner 22 for supporting the hearth platen 13 provided above the upper frame 1.

(3) As shown in FIG. 4 (c), a high-pressure gas, for example, a pressure of about 0.
When air of 7 MPa, for example, is supplied, the furnace bottom platen 13 can be raised by fluid pressure.

The gas pressure introduced into the airbag 3 can be appropriately determined by setting the rising force F and the total length of the airbag 3.

The gas pressure can be adjusted using a compressor or the like. Further, a liquid such as water which is an incompressible fluid may be used instead of a gas such as air or nitrogen gas which is a compressible fluid.

The fluid pressure causes the bottom platen 13 to rise, and a gap C is formed between the transfer table 17 and the spread beam 14 to separate the spread beam 14 and the transfer table 17 from each other. When the spread beam 14 and the carrier 17 are separated from each other, the rolling roller 20 of the moving means incorporated in the hydraulic lift mechanism R shown in FIG. Panel 13 and new furnace bottom 12
(Hereinafter, these moving objects are also simply referred to as the bottom of the new furnace)
Can be moved.

For example, assuming that the bottom weight of the new furnace is about 40 MN (mass: 4000 tons), the traction force is as follows:
Assuming that the rolling friction coefficient μ of the rolling roller 20 is 0.05, 4
0MN × 0.05 = 2MN. When the traction force of 2 MN is dispersed in two places, the traction force per place is about 1 MN, and a special traction force is not required. Therefore, a general traction device such as a winch or a hydraulic cylinder can be used. .

(4) As shown in FIG. 4D, after moving the new furnace bottom 12 onto the furnace bottom base 15 above the blast furnace base 11, the pressure of the airbag 3 is lowered and the spread beam 14 is moved to the furnace. Land on the bottom base 15.

After the laying beam 14 is placed on the hearth base 15, when the fluid pressure lift mechanism R is pulled out from the hearth base 15, a space A is created.

The broken line in the figure indicates the hydraulic lift mechanism R
Shows a state in which is drawn out. FIG. 5 is a diagram showing aa of FIG.
It is a conceptual diagram showing a sectional view.

FIG. 1 shows an airbag 3 having a full-length integrated structure as an embodiment of the airbag 3 of the fluid pressure lift mechanism R having moving means.

As shown in the figure, when the fluid pressure in the air bag 3 is increased to a predetermined pressure, an upward rising force acts, and the furnace bottom plate 1 is moved through the upper frame 1 and the liner 22.
3 can be raised.

Hereinafter, a method of pulling the bottom plate 13 (see FIG. 3) to the bottom base 15 will be described. FIG. 6 (a),
FIG. 6B is a conceptual view showing a method of pulling the new furnace bottom from the transfer table to the furnace base, and FIG. 6A is an elevation view showing a relationship between the new furnace bottom and the transfer table. FIG. 6B is a plan sectional view showing the relationship between the bottom of the new furnace and the transfer table.

As shown in FIG. 6A, the upper surface 19 of the transfer table 17 and the upper surface 19 of the connecting table 16 connecting the transfer table 17 and the furnace bottom base 15 previously installed on the blast furnace base 11 and the furnace bottom base. By setting the same height as the upper surface of 15, the rolling rollers, which are moving means provided in the hydraulic lift mechanism R, can be easily pulled by the pulling device 23.

The towing position is from the position of the transfer table 17 (the position indicated by (X) in the drawing) to the furnace bottom base position (the position indicated by (Y) in the drawing).

Even if the upper surface 19 of the connecting table 16 for supporting the rotation of the rolling rollers is not a flat plate, even if it is a rail-shaped track laid at the same height as the transfer table 17 and the hearth base 15, there is a problem in rigidity. Good without.

The step between the transfer table 17 and the connection table 16 or between the connection table 16 and the hearth base 15 is 2 steps.
mm or less is desirable to reduce the load on the traction device that pulls the rolling rollers.

As the rolling rollers to be used, for example, a chill tank or a tough roller (all of which are trade names) widely used for transporting a super heavy object can be used.

These rolling rollers have a small overall height and a small size in terms of the loading capacity, and are loaded with a plurality of rollers, so that they have a small rolling friction coefficient μ instead of the roller diameter.

After the movement of the new furnace bottom 12 onto the furnace bottom base 15 is completed, the blast furnace body 4 is lowered by the hydraulic jack 7 and joined at the upper surface portion 10 of the new furnace bottom 12.

Next, the fluid pressure lifting mechanism R is extracted from the furnace bottom base 15 and concrete or irregular refractories are pressure-fed and filled into a space A (see FIG. 4) formed between the parallel laying beams 14. Thereby, the new furnace bottom part 12 and the blast furnace base part 11 can be integrally fastened and fixed.

[0066]

According to the present invention, a new furnace bottom can be easily moved and installed on a furnace bottom base within a short period of time, for example, within three days, and is a technology that can be immediately put into practical use. Is big.

[Brief description of the drawings]

FIGS. 1A and 1B are conceptual diagrams of an embodiment for explaining the principle of a fluid pressure lift mechanism. FIG.
FIG. 1B shows the case where no fluid pressure is applied, and FIG. 1B shows the case where fluid pressure is applied.

FIG. 2 is a longitudinal sectional view conceptually showing an example of a method of separating a blast furnace body and a furnace bottom.

3 (a) and 3 (b) are conceptual diagrams showing the relationship between the bottom of a new furnace and a transfer table according to an embodiment, and FIG. 3 (a) is a plan view; FIG. 3B is a longitudinal sectional view.

FIGS. 4 (a), (b), (c) and (d) show moving means between a spread beam supporting a bottom platen located at a lower portion of a new furnace bottom and a spread beam. FIG. 4 (a) is a conceptual view showing a method of an embodiment in which a hydraulic lift mechanism provided with the apparatus is loaded and the new furnace bottom is moved, and FIG. FIG. 4 shows a state in which the furnace bottom is mounted.
4B shows a state in which the fluid pressure lift mechanism is inserted between the spread beams, and FIG. 4C shows a state in which the fluid pressure of the fluid pressure lift mechanism having the moving means is increased. Shows a state in which the bottom plate and the new bottom are moved to the bottom base by the moving means, and then the pressure of the fluid pressure lift mechanism is lowered to land on the bottom base.

FIG. 5 is a conceptual diagram showing an aa sectional view of FIG. 4 (c).

6 (a) and 6 (b) are conceptual diagrams showing a method of towing a new furnace bottom from a carrier to a furnace bottom base.
(A) is an elevational view showing the relationship between the new furnace bottom and the carrier, and FIG. 6 (b) is a plan sectional view showing the relationship between the new furnace bottom and the carrier.

[Explanation of symbols]

 1: Upper frame 2: Lower frame 3: Air bag 4: Blast furnace furnace 5: Furnace tower 6: Beam 7: Hydraulic jack 8: Furnace support bracket 9: Furnace bottom 10: Upper surface 11: Blast furnace base 12: New furnace bottom 13: Furnace bottom surface plate 14: Spread beam 15: Furnace bottom base 16: Connection table 17: Carriage 18: Moving device 19: Upper surface of connection table 20: Rolling rollers 21: Frame of rolling rollers 22: Liner 23: Traction device 24: Carrier A: Space B: Contact width C: Gap H: Height of spread beam F: Lifting force L: Spacing of spread beam P: Pressure R: Fluid pressure lift mechanism S: Air bag Ascent stroke

Claims (3)

[Claims] 1. A method of separating a furnace bottom from a blast furnace body and renewing the furnace bottom with a new furnace bottom, comprising: (a) installing a furnace bottom plate on a plurality of spreading beams; (B) placing a hydraulic lift mechanism with moving means between the spread beams and the spread beams; and (c) increasing the fluid pressure of the hydraulic lift mechanism to increase the new pressure. A method of repairing a blast furnace, comprising raising the furnace bottom, separating the transfer table from the new furnace bottom, and (d) disposing the new furnace bottom at a predetermined position by moving means of the fluid pressure lift mechanism. 2. A method for separating a furnace bottom from a blast furnace body and renewing the furnace bottom to a new furnace bottom, comprising: (a) placing a plurality of spread beams on a carrier provided with a moving device; (C) After moving the carrier on which the new furnace bottom is mounted to a predetermined position, (d) placing the floor (E) raising the fluid pressure of the hydraulic lift mechanism to raise the bottom of the new furnace, thereby increasing the fluid pressure of the hydraulic lift mechanism, and (F) A method of repairing a blast furnace, comprising: disposing a new furnace bottom at a predetermined position by moving means of the hydraulic lift mechanism. 3. The method according to claim 1, wherein the moving means is a rolling roller.