JP2016194130A - Stave cooler deformation correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stave cooler deformation correction method capable of suppressing a cost for replacing a stave cooler.SOLUTION: In a method for correcting thermal deformation generated in a stave cooler 10 mounted to an in-furnace side wall of a shell 20 forming a furnace wall of a vertical furnace, a through hole 22 is formed in the shell 20 and a long member 30 is inserted through the through hole 22, one end of the long member 30 is fixed to a deformed part 15 curved toward the inside of the furnace by thermal deformation of the stave cooler 10, and the long member 30 is pulled to the other end side thereof by a pulling device disposed outside the furnace to correct the deformed part 15.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a deformation correction method for a stave cooler that corrects thermal deformation that has occurred in a stave cooler that is attached to the inner surface of an iron skin that forms the furnace wall of a vertical furnace.

Usually, a stave cooler is attached to the inner wall of the furnace wall of the blast furnace for the purpose of cooling protection of the furnace shell, thereby extending the life of the furnace.
A typical stave cooler has a plurality of cooling pipes extending in the vertical direction, and the cooling water is passed through the cooling pipes from the bottom to the top so as to achieve a cooling effect on the furnace wall. is there. And the cooling piping connected with a cooling pipe is welded to the furnace outer surface of a stave cooler, and cooling water is sent to a stave cooler from the furnace outer side of an iron skin.
Further, as shown in FIG. 5, a plurality of ribs 11 extending substantially horizontally in the left-right direction are arranged on the furnace inner surface of the stave cooler 10, and a refractory material is inserted into a groove between the upper and lower ribs 11. .

  Here, in the general stave cooler 10, as shown in FIG. 6, there is a problem that the upper end and the lower end of the stave cooler 10 are thermally deformed and curved on the furnace inner surface side due to a temperature change in the furnace.

In response to this problem, a stave cooler 10 that hardly causes thermal deformation has been proposed (see, for example, Patent Documents 1 to 3).
Further, the invention described in Patent Document 1 is provided with a plurality of ribs 11 extending horizontally on the furnace inner surface of the stave cooler 10, and the rib 11 and the stave cooler 10 are made of different materials, respectively. Heat cushioning is prevented by interposing a cushioning material on the surface.

The invention described in Patent Document 2 prevents thermal deformation by forming the longitudinal reinforcing ribs 11 by making the left and right side edge portions of the back side (furnace outer side) of the stave cooler 10 thicker than other portions. is there.
Furthermore, the invention described in Patent Document 3 prevents thermal deformation by arranging a plurality of rows of refractory substances in the vertical direction and holding them by the base metal ribs 11.

Japanese Patent No. 2932985 JP-A-9-209002 JP-A-8-134519

  However, even with the stave cooler 10 described in Patent Documents 1 to 3 in which measures against thermal deformation are taken, the time at which thermal deformation occurs can be delayed, but thermal deformation cannot be prevented completely.

  When the thermal deformation has occurred as shown in FIG. 6, a bending force is applied to the cooling pipe 18 along with the curvature of the stave cooler 10, and a high stress is generated at the base of the cooling pipe 18. Therefore, if this is accumulated, a crack due to fatigue occurs in that portion.

  In addition, problems such as high-temperature gas entering the furnace come into the gap between the stave cooler 10 and the refractory material of the iron skin caused by thermal deformation.

  In this way, the stave cooler 10 that has once undergone thermal deformation has only to be replaced with a new stave cooler 10, but currently there is no way to deal with it. However, a large amount of work is required to manufacture a new stave cooler 10 and replace the stave cooler 10. Cost.

  Here, the present applicant has focused on correcting the thermal deformation generated in the stave cooler 10 and continuing to use the stave cooler 10, and has completed the present invention by repeating inventive ideas.

  An object of the present invention is to provide a deformation correction method for a stave cooler that can suppress the replacement cost of the stave cooler.

  In order to achieve the above object, a method for correcting deformation of a stave cooler (10) according to claim 1 of the present invention is attached to an inner surface of an iron skin (20) constituting a furnace wall of a vertical furnace. This is a method for correcting the thermal deformation generated in the stave cooler (10), wherein a through hole (20) is formed in the iron skin (20), and a long object (30) is inserted into the through hole (22). At the same time, one end of the long object (30) is fixed to a deformed portion (15) curved to the inside of the furnace by the thermal deformation of the stave cooler (10), and the long object (30) is fixed by the tension device disposed outside the furnace. The scale (30) is pulled to the other end side to correct the deformed portion (15).

  Moreover, the deformation correction method of the stave cooler (10) according to claim 2, wherein the other end of the long object (30) is connected to the iron skin (20) while the long object (30) is pulled. Alternatively, it is fixed to a structure outside the furnace.

  Further, in the method for correcting deformation of the stave cooler (10) according to claim 3, the heat generated in the stave cooler (10) attached to the inner surface of the iron skin (20) constituting the furnace wall of the vertical furnace. A method of correcting deformation, wherein an extruding device (40) is arranged in a furnace, and the extruding device (40) is a deformed portion (15) curved to the inside of the furnace by the thermal deformation of the stave cooler (10). Is extruded to the outside of the furnace.

  Further, in the method for correcting deformation of the stave cooler (10) according to claim 4, through holes (12, 22) are formed in the stave cooler (10) and the iron skin (20) by aligning the positions of both. The wire (43) is inserted into the through hole (12) of the stave cooler (10) and the through hole (22) of the iron skin (20), and one end of the wire (43) is inserted into the extrusion device (40). The other end side of the wire is fixed to a structure outside the furnace in a state where the wire (43) is pulled to the other end side.

  According to a fifth aspect of the present invention, in the method for correcting deformation of the stave cooler (10), a fixed body is disposed in the furnace, and an uncurved portion of the stave cooler (10) is fixed to the fixed body. Features.

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

  According to the method for correcting deformation of a stave cooler according to claim 1 of the present invention, a through hole is formed in the iron skin, a long object is inserted into the through hole, and one end of the long object is thermally deformed by the stave cooler. By fixing to the deformed part curved inside the furnace and pulling a long object to the other end with a tension device arranged outside the furnace, the deformed part is corrected, so the deformed part remains until the stave cooler is installed in the furnace Can be corrected. Therefore, since the stave cooler can be used for a long period of time, it is possible to suppress the cost for the manufacture and replacement work of the stave cooler.

  Further, according to the method for correcting deformation of a stave cooler according to claim 2, in addition to the function and effect of the invention according to claim 1, the other end of the long object is attached to the iron skin while the long object is pulled. Or since it fixes to the structure outside a furnace, the deformation | transformation after correcting a deformation | transformation can be suppressed or delayed. Therefore, the life of the stave cooler can be further extended, and as a result, the cost can be further suppressed.

  Further, according to the method for correcting deformation of a stave cooler according to claim 3, an extrusion device is arranged in the furnace, and the deformation portion curved to the inside of the furnace by the heat deformation of the stave cooler is pushed out to the outside of the furnace by the extrusion device. The deformed part can be corrected until the stave cooler remains installed in the furnace. Therefore, since the stave cooler can be used for a long period of time, it is possible to suppress the cost for the manufacture and replacement work of the stave cooler.

Moreover, according to the deformation correction method of the stave cooler according to claim 4, in addition to the function and effect of the invention according to claim 3, a through-hole is formed in the stave cooler and the iron skin in accordance with the positions of both, Insert the wire into the through hole of the stave cooler and the through hole of the iron skin, fix one end of the wire to the extrusion device, and pull the wire to the other end side, and connect the other end side of the wire to the structure outside the furnace Therefore, the reaction force when the stave cooler is pressed by the extrusion device can be received by the wire, and the deformation of the stave cooler can be reliably corrected.
At this time, if the number of wires is increased, the pushing load can be further increased, so that the deformation can be more easily corrected.

  According to the method for correcting deformation of a stave cooler according to claim 5, in addition to the operational effects of the invention according to claims 1 to 4, a stationary body is arranged in the furnace so that the stave cooler is not curved. Since the portion is fixed to the fixed body, the reaction force when the stave cooler is pulled by the tension device or pushed out by the extrusion device can be received by the fixed body, and the thermal deformation can be corrected smoothly.

  Note that Patent Documents 1 to 3 described above completely correct the thermal deformation generated in the stave cooler by pulling it with a pulling device or pushing it out with an extrusion device as in the method for correcting deformation of a stave cooler of the present invention. Not listed.

It is sectional drawing which shows the state which formed the through-hole in the iron shell among the deformation correction methods of the stave cooler which concerns on 1st embodiment of this invention. It is sectional drawing which shows the state which attached the tension rod to the deformation | transformation part of a stave cooler among the deformation correction methods of the stave cooler which concerns on 1st embodiment of this invention. It is sectional drawing which shows the state by which the deformation | transformation of the stave cooler was corrected among the deformation correction methods of the stave cooler which concerns on 1st embodiment of this invention. It is sectional drawing which shows the deformation correction method of the stave cooler which concerns on 2nd embodiment of this invention. It is a perspective view which shows a stave cooler. It is a side view which shows the state which the thermal deformation produced in the stave cooler.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 3, FIG. 5 and FIG. 6, the deformation | transformation correction method of the stave cooler 10 which concerns on 1st embodiment of this invention is demonstrated.
The same parts as those shown in the conventional example are denoted by the same reference numerals.

The stave cooler 10 is a thin plate attached to the inner surface of the iron skin 20 that constitutes the furnace wall of the vertical furnace. Direction). A joint material made of a refractory material is applied to a gap between adjacent stave coolers 10.
A plurality of cooling pipes are embedded in the stave cooler 10, and the cooling effect on the furnace wall is achieved by passing water.
A cooling pipe (not shown in FIGS. 1 to 3) is connected to the outer surface of the stave cooler 10 and communicates with the cooling pipe.
And when it attaches to the furnace inner surface of the iron skin 20, the furnace outer surface of the stave cooler 10 is planar (refer FIG. 5).

  Here, as shown in FIG. 6, when thermal deformation occurs due to a temperature change in the furnace, the upper end and the lower end of the stave cooler 10 bend toward the furnace inner surface side. In FIG. 6, the shape (position) of the outer surface of the furnace of the stave cooler 10 before thermal deformation is indicated by a double chain line.

Next, a deformation correction method for correcting the thermal deformation of the stave cooler 10 will be described with reference to FIGS. 1 to 3.
First, as shown in FIG. 1, a through hole 22 is formed in the iron skin 20. The height at which the through hole 22 is formed is the same height as the deformed portion 15 in which the stave cooler 10 is curved toward the inside of the furnace due to thermal deformation.
At this time, dust that has entered between the furnace outer surface of the stave cooler 10 and the iron skin 20 when the stave cooler 10 is bent is removed from the through hole 22 through the pipe material 28 and the like.

Next, an internal thread 13 is formed on the outer surface of the deformed portion 15 of the stave cooler 10.
Then, a metal tension rod 30 having a male screw 33 that can be screwed with the female screw 13 of the stave cooler 10 at one end is prepared.

  Next, as shown in FIG. 2, one end of the tension rod 30 is inserted into the through-hole 22 of the iron skin 20, and the male screw 33 of the tension rod 30 is screwed to the female screw 13 of the stave cooler 10. And the tension rod 30 are fastened.

  Next, the tension rod 30 is slowly pulled to the outside of the furnace (the other end side) by a tension device such as a jack 41 arranged outside the furnace. Thereby, the deformation | transformation part 15 which curved to the furnace inner side is corrected.

  Then, the other end side of the tension bar 30 is fixed to a structure outside the furnace while the tension bar 30 is pulled as shown in FIG. 3, and the reaction force generated is received by this structure. As this fixing method, a known fixing method such as welding or bolting is appropriately used. It may be fixed via another member.

  According to the deformation correction method for the stave cooler 10 performed as described above, the through hole 22 is formed in the iron skin 20, the long object 30 is inserted into the through hole 22, and one end of the tension rod 30 is connected to the stave cooler 10. Is fixed to the deformed portion 15 curved to the inside of the furnace by thermal deformation, and the tensile rod 30 is pulled to the other end side by a tension device arranged outside the furnace, so that the deformed portion 15 is corrected. The deformed portion 15 can be corrected until it is installed. Therefore, since the stave cooler 10 can be used for a long period of time, it is possible to suppress the cost required for the manufacture and replacement work of the stave cooler 10.

  And since the other end side of the tension | tensile_strength rod 30 is fixed to the structure outside a furnace in the state which pulled the tension | tensile_strength rod 30, the deformation | transformation after correcting a deformation | transformation can be suppressed or delayed. Therefore, the life of the stave cooler 10 can be further extended, and as a result, the cost can be further suppressed.

(Second embodiment)
Next, with reference to FIG. 4, the deformation correction method of the stave cooler 10 which concerns on 2nd embodiment of this invention is demonstrated. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.
The difference of this embodiment from the first embodiment is that the extrusion device 40 is used instead of the tension device which is a device for applying force to the stave cooler 10, and other components (the iron skin 20 and the stave cooler 10 The positional relationship is the same as in the first embodiment.

First, the extrusion apparatus 40 is arrange | positioned in a furnace. The extrusion device 40 includes a jack 41 and a mounting table 42 on which the jack 41 is mounted.
The height at which the jack 41 is disposed must match the height of the curved deformed portion 15 of the stave cooler 10, and since the position is high, the mounting table 42 is suspended here. The mounting table 42 having a size (height) that can be installed may be used.

Next, the through holes 12 and 22 are formed in the stave cooler 10 and the iron skin 20. The through-hole 12 of the stave cooler 10 and the through-hole 22 of the iron skin 20 are formed in such a manner that the positions of the two are aligned (so that both face each other).
Here, in particular, since a cooling pipe is embedded in the stave cooler 10, the through hole 12 of the stave cooler 10 is arranged avoiding this cooling pipe.
Next, dust that has entered between the outer surface of the furnace of the stave cooler 10 and the iron skin 20 when the stave cooler 10 is bent is removed from the through holes 12 and 22.

Next, the wire 43 is inserted into the through hole 12 of the stave cooler 10 and the through hole 22 of the iron skin 20, and one end of the wire 43 is fixed to the extrusion device 40. Or the wire 43 previously attached to the extrusion apparatus 40 is pulled out from the inside of the furnace, inserted into the through hole 12 of the stave cooler 10 and the through hole 22 of the iron skin 20, and the other end side of the wire 43 is taken out of the furnace.
Next, the other end side of the wire 43 is fixed to a structure outside the furnace in a state where the wire 43 is pulled toward the other end side and is taut.

  And the deformation | transformation part 15 curved to the furnace inner side by the thermal deformation of the stave cooler 10 is slowly extruded to the furnace outer side with the extrusion apparatus 40, and the deformation | transformation part 15 is corrected.

  Also by the deformation correction method of the stave cooler 10 performed as described above, the extrusion device 40 is arranged in the furnace, and the deformation portion 15 curved to the inside of the furnace by the heat deformation of the stave cooler 10 by the extrusion device 40 is moved to the outside of the furnace. Since it extrudes, the deformation | transformation part 15 can be corrected until the stave cooler 10 is installed in the furnace. Therefore, since the stave cooler 10 can be used for a long period of time, it is possible to suppress the cost required for the manufacture and replacement work of the stave cooler 10.

  Further, the through holes 12 and 22 are formed in the stave cooler 10 and the iron skin 20 so as to match the positions thereof, and the wires 43 are inserted into the through holes 12 of the stave cooler 10 and the through holes 22 of the iron skin 20, and the wires Since one end of 43 is fixed to the extrusion device 40 and the other end side of the wire 43 is fixed to a structure outside the furnace while the wire 43 is pulled to the other end side, the stave cooler 10 is pressed by the extrusion device 40. The reaction force at the time can be received by the wire 43, and the deformation of the stave cooler 10 can be reliably corrected.

  In the first and second embodiments, a large weight or a fixed body fixed to the furnace bottom is disposed in the furnace, and the uncurved portion of the stave cooler 10 is fixed directly or indirectly to the fixed body. Then, the reaction force when the stave cooler 10 is pulled by the pulling device or when the stave cooler 10 is pushed out by the extrusion device 40 can be received by the fixed body, and the thermal deformation can be corrected more smoothly.

  In the first embodiment, the tension rod 30 is connected to the stave cooler 10 and pulled. However, the tension rod 30 is not limited to the tension rod 30 and may be any other long object 30 such as a wire. At this time, the connection between the stave cooler 10 and the long object 30 can be achieved by attaching a hanging ring (round ring) to the stave cooler 10, for example. A winch or the like is suitable as a pulling device when using a wire.

Further, while the tension bar 30 is pulled, the other end of the tension bar 30 is fixed to the structure outside the furnace. However, the tension bar 30 is fixed to the iron skin 20 instead of the structure outside the furnace. And you may receive reaction force at the time of correction.
Furthermore, the tension rod 30 may be removed from the stave cooler 10 after correction.

Further, the tension rod 30 and the stave cooler 10 are fixed by the male screw 33 and the female screw 13, but the present invention is not limited to this. For example, the through hole 12 is formed in the stave cooler 10, and the one end has a diameter. The other end of the tension rod 30 is inserted into the through hole 12 of the stave cooler 10 and the through hole 22 of the iron skin 20 from the inside of the furnace, and the large diameter portion of one end of the tension rod 30 is connected to the stave cooler. You may hook on the inner surface of 10 furnaces.
As another method, welding the tension rod 30 and the stave cooler 10 is also conceivable. Still another method may be adopted.

  Moreover, in 2nd embodiment, it is possible to increase the number of the wires which pull the deformation | transformation part 15 of the stave cooler 10 by forming a through-hole also in the stave cooler and iron shell which are not shown except the correction object. Thereby, since an extrusion load can be increased, the deformation | transformation of the stave cooler 10 can be corrected more reliably.

DESCRIPTION OF SYMBOLS 10 Stave cooler 11 Rib 12 Through-hole 13 Female screw 15 Deformation part 18 Cooling piping 20 Iron skin 22 Through-hole 28 Pipe material 30 Tensile rod (long object)
33 Male screw 40 Extruding device 41 Jack 42 Mounting table 43 Wire

Claims (5)

A method for correcting thermal deformation generated in a stave cooler attached to a furnace inner surface of an iron skin constituting a furnace wall of a vertical furnace,
A through hole is formed in the iron skin, a long object is inserted into the through hole, and one end of the long object is fixed to a deformed portion curved inside the furnace by the thermal deformation of the stave cooler. A method of correcting a deformation of a stave cooler, wherein the deformed portion is corrected by pulling the long object to the other end side with a tension device arranged outside.   The method for correcting deformation of a stave cooler according to claim 1, wherein the other end of the long object is fixed to the iron shell or a structure outside the furnace while the long object is pulled. A method for correcting thermal deformation generated in a stave cooler attached to a furnace inner surface of an iron skin constituting a furnace wall of a vertical furnace,
An apparatus for correcting deformation of a stave cooler, wherein an extruding device is arranged in a furnace, and a deformed portion curved toward the inside of the furnace by the thermal deformation of the stave cooler is pushed out to the outside of the furnace by the extruding device.   A through hole is formed in the stave cooler and the iron skin in the same position, and a wire is inserted into the through hole of the stave cooler and the through hole of the iron skin, and one end of the wire is connected to the extrusion device. The method for correcting deformation of a stave cooler according to claim 3, wherein the other end side of the wire is fixed to a structure outside the furnace in a state where the wire is pulled to the other end side.   The deformation correction of the stave cooler according to any one of claims 1 to 4, wherein a fixed body is disposed in the furnace, and an uncurved portion of the stave cooler is fixed to the fixed body. Method.