Method for installing stave cooler in blast furnace and installation structure of stave cooler

Abstract

To provide an installation method that can reliably fill a gap between the back of a stave cooler and an outer steel shell with a refractory, while simplifying installation operation.SOLUTION: On the back of a stave cooler A before installation in a blast furnace, an embankment 1 of a plastic refractory is provided along its periphery, the stave cooler A with the embankment 1 is attached and fixed to the inside of the outer steel shell B with the embankment 1 adhering to the inner surface of the outer steel shell when the blast furnace is off, and then a gap 2 between a back part of the stave cooler surrounded by the embankment 1 and the inner surface of the outer steel shell is filled by injecting castable refractory 3 from the side of the outer steel shell B. Since the plastic refractory comprising embankment 1 is plastic, it adheres to the inner surface of the outer steel shell by deforming in imitation of the inner surface of the outer steel shell, which has a rough surface with unevenness and bumps caused by residual refractory, thereby securely sealing around the gap 2 and allowing the gap 2 to be filled appropriately with castable refractory 3.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a stave cooler installation method when replacing an existing stave cooler with a new stave cooler in a blast furnace, and an installation structure of a stave cooler installed by this method. [Background technology]

[0002] During operation of a blast furnace, if damage to a stave cooler is detected, the damaged portion of the stave cooler must be replaced with a new stave cooler. When replacing a stave cooler, the load inside the blast furnace is reduced so that the damaged stave cooler can be removed. The load inside the furnace is reduced until the stave cooler to be replaced is exposed on the inner wall of the furnace. When the stave cooler is exposed, the furnace is turned off. In this turned-off state, a hoist is lowered from the furnace top and connected to the stave cooler, and the cooling pipes and other components connected to the stave cooler are disconnected and the stave cooler is disconnected from the steel shell. During this disconnection, some of the refractory that was filled in the gap between the steel shell and the back of the stave cooler may fall off. In that case, the remaining refractory remains attached to the steel shell. After the stave cooler that has been separated from the steel shell is lifted and carried out from the furnace top, a new stave cooler is lowered from the furnace top and installed.

[0003] During the installation of this new stave cooler, gaps are created between the stave cooler, which is placed on the inside of the steel shell, and the steel shell. If high-temperature gas from the blast furnace flows into this gap, there is a risk that the steel shell will become red-hot and be damaged, so a construction method is used during installation to eliminate these gaps. For example, Patent Document 1 shows the following method of installing a stave cooler. That is, an elastically deformable seal material such as sponge or rubber is provided along the periphery of the back surface of the stave cooler before installation in the blast furnace so that an opening is formed at the upper end side of the back surface. After the stave cooler provided with this seal material is attached to the inside of the steel shell when the blast furnace is stopped, the gap between the steel shell at the position surrounded by the seal material and the back surface of the stave cooler is filled by pouring an amorphous refractory from the steel shell side. Next, the blowing of the blast furnace is started to harden the amorphous refractory poured into the gap by the furnace heat and burn off the seal material. Next, the blast furnace is stopped again, and the amorphous refractory is pressed and filled from the steel shell side into the burned-off space of the seal material. Furthermore, Patent Document 2 discloses a method in which a flexible plastic refractory material is applied (lined) to a uniform thickness of about 50 to 100 mm over the entire back surface of a stave cooler before it is installed in a blast furnace, and when this stave cooler is installed inside the steel shell during blast furnace shutdown, the stave cooler is pressed against the steel shell to deform the plastic refractory material, thereby eliminating gaps. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-234216 A [Patent Document 2] JP 2013-36052 A Summary of the Invention [Problem to be solved by the invention]

[0005] When an existing stave cooler is removed during stave replacement work, the refractory filled between the steel shell and the stave cooler often has cracks, or the refractory is partially chipped or broken and falls off, and the inner surface of the steel shell often has a rough surface with unevenness and steps. Therefore, in the method of Patent Document 1, the inner surface of the steel shell, which has unevenness and steps, cannot be completely sealed with an elastically deformable sealant such as sponge or rubber, and when the amorphous refractory is injected into the gap between the back surface of the stave cooler and the steel shell, the amorphous refractory may leak out, and the gap may not be filled with the amorphous refractory. In addition, the method of Patent Document 1 requires two times each of stopping the blast furnace and injecting the amorphous refractory into the gap between the back surface of the stave cooler and the steel shell, which makes the installation work complicated and increases the timing of construction.

[0006] In addition, in the method of Patent Document 2, a flexible plastic refractory material is applied to the entire back surface of the stave cooler with a uniform thickness and pressed against the steel shell to adhere to it. Although it is possible to eliminate gaps by deforming the plastic refractory material to some extent for unevenness, even if part of the refractory material on the steel shell has fallen off, causing a large step or dent, it is necessary to deform the plastic refractory material over the entire surface of the stave cooler, which requires an extremely large force, and therefore there are cases where the gap cannot be filled.

[0007] Therefore, the object of the present invention is to provide a method for installing a stave cooler that solves the problems of the conventional art and can reliably fill the gap between the back surface of the stave cooler and the steel shell with refractory material even when there are large irregularities or steps on the inner surface of the steel shell due to partial loss of the existing refractory material, when installing a new stave cooler in a stave cooler replacement work, and can be easily installed in a short time. Another object of the present invention is to provide an installation structure for a stave cooler obtained by such an installation method. [Means for solving the problem]

[0008] The gist of the present invention for solving the above problems is as follows. [1] A method for installing a stave cooler (A) when replacing an existing stave cooler with a new stave cooler (A) in a blast furnace, Before installation in the blast furnace, a plastic refractory bank (1) is provided along the periphery of the back of the stave cooler (A), The stave cooler (A) provided with the plastic refractory bank (1) is attached and fixed to the inside of the steel shell (B) during the blast furnace shutdown so that the plastic refractory bank (1) is in close contact with the inside surface of the steel shell, and then A method for installing a stave cooler in a blast furnace, comprising the steps of injecting and filling a gap (2) between a back portion of the stave cooler surrounded by a bank (1) of plastic refractory material and the inner surface of the steel shell with unshaped refractory material (3) from the steel shell (B) side. [2] In the installation method of [1] above, the stave cooler (A) has a flat plate shape, A method for installing a stave cooler in a blast furnace, characterized in that, when the maximum thickness of the remaining refractory material adhering to the inner surface of the steel shell after the existing stave cooler is removed is t (mm), and the distance in the furnace radial direction between the curved inner surface of the steel shell and the widthwise center of the back surface of the stave cooler when the stave cooler (A) is attached and fixed inside the steel shell (B) is L (mm), the height h (mm) of the bank of plastic refractory material satisfies the following formula (1). h = t + L + α … (1) However, 15mm≦α≦30mm

[0009] [3] A method for installing a stave cooler in a blast furnace according to the above-mentioned [1] or [2], characterized in that an opening (100) penetrating the width direction of the bank portion (10a) of the plastic refractory bank (1) along the upper edge of the back surface of the stave cooler is formed in the bank portion (10a). [4] A method for installing a stave cooler in a blast furnace, characterized in that in any one of the above-mentioned [1] to [3], the width of the bank portion (10b) of the plastic refractory material bank (1) along both side edges of the back surface of the stave cooler is 50 to 200 mm. [5] A method for installing a stave cooler in a blast furnace, characterized in that in any one of the above-mentioned installation methods [1] to [4], a plastic refractory layer (4) having a thickness thinner than the height of the plastic refractory bank (1) is provided on a back portion of the stave cooler surrounded by the plastic refractory bank (1).

[0010] [6] In any of the installation methods [1] to [5] above, a water supply and drainage pipe section (5) for supplying and draining cooling water to and from the internal refrigerant flow path is attached to the stave cooler (A) before it is installed in the blast furnace, A method for installing a stave cooler in a blast furnace, characterized in that a plastic refractory bank (1) is provided on the back of a stave cooler (A) so that a water supply and drainage pipe section (5) penetrates a bank section (10a) along the upper edge of the back of the stave cooler and / or a bank section (10c) along the lower edge of the back of the stave cooler. [7] In the installation method of the above [6], with the stave cooler (A) attached and fixed inside the steel shell (B), the water supply and drainage pipe section (5) is inserted into the insertion hole (6) formed through the steel shell (B), and a sealing metal fitting (7) is provided around the water supply and drainage pipe section (5) protruding from the insertion hole (6) to the outside of the steel shell (B) to seal the gap between the peripheral portion of the insertion hole (6) and the water supply and drainage pipe section (5); A method for installing a stave cooler in a blast furnace, characterized in that a part of the bank portion (10a) and / or the bank portion (10c) is adapted to block a gap between a peripheral portion of the insertion hole (6) and a water supply / drainage pipe portion (5).

[0011] [8] The installation structure of a stave cooler (A) newly installed in place of an existing stave cooler in a blast furnace through replacement work, The stave cooler (A) is attached and fixed inside the steel shell (B), A stave cooler installation structure for a blast furnace, characterized in that a bank-shaped plastic refractory layer (1x) is interposed between a portion along the peripheral edge of the back surface of the stave cooler (A) and the inner surface of the steel shell, and a moldable refractory layer (3x) is interposed between the back portion of the stave cooler surrounded by the plastic refractory layer (1x) and the inner surface of the steel shell. [9] An installation structure of a stave cooler in a blast furnace, characterized in that in the installation structure of [8] above, a plastic refractory layer (4x) having a thickness thinner than the plastic refractory layer (1x) is provided at a rear portion of the stave cooler surrounded by the plastic refractory layer (1x), and an amorphous refractory layer (3x) is interposed between the plastic refractory layer (4x) and the inner surface of the steel shell.

[0012]

[10] In the installation structure of the above [8] or [9], a water supply and drainage pipe section (5) for supplying and draining cooling water to and from the refrigerant flow path inside the stave cooler (A) is attached to the stave cooler (A), The water supply and drainage pipe section (5) penetrates a plastic refractory layer portion (10ax) along the upper edge of the back surface of the stave cooler and / or a plastic refractory layer portion (10cx) along the lower edge of the back surface of the stave cooler, of the plastic refractory layer (1x).

[11] In the installation structure of

[10] above, the water supply and drainage pipe section (5) is inserted into an insertion hole (6) formed in the shell (B), and a sealing metal fitting (7) is provided around the water supply and drainage pipe section (5) protruding from the insertion hole (6) to the outside of the shell (B) to seal the gap between the peripheral portion of the insertion hole (6) and the water supply and drainage pipe section (5); A stave cooler installation structure for a blast furnace, characterized in that a plastic refractory layer portion (10ax) and / or a part of the plastic refractory layer portion (10cx) seals a gap between a peripheral portion of an insertion hole (6) and a water supply and drainage pipe portion (5). Effect of the Invention

[0013] According to the present invention, when installing a new stave cooler in stave cooler replacement work, even if there are large irregularities or steps on the inner surface of the steel shell due to partial loss of existing refractory, the gap between the back surface of the stave cooler and the steel shell can be reliably filled with refractory, and the installation work is simple and the stave cooler can be installed in a short period of time. Furthermore, according to a specific embodiment of the present invention, the gap between the water supply and drainage piping of the stave cooler and the insertion holes on the steel shell side can be sealed by a plastic refractory material applied along the periphery of the back surface of the stave cooler, thereby preventing the amorphous refractory material (the material injected into the gap between the stave cooler and the steel shell) from penetrating into the sealing metal fittings that seal the gap between the water supply and drainage piping and the insertion holes on the steel shell side, thereby achieving the effect of allowing the stave cooler to be installed without impairing the function of the sealing metal fittings. [Brief description of the drawings]

[0014] [Figure 1] A plan view of a new stave cooler installed in a blast furnace in accordance with the present invention, in which a plastic refractory bank is provided along the periphery of the back surface of the stave cooler, as viewed from the back surface side. [Diagram 2] Cross-sectional view taken along line II-II in Figure 1. [Diagram 3] FIG. 3 is a side view showing the state in which the stave cooler of FIG. 1 and FIG. 2 is attached and fixed to the inside of the steel shell in a state in which a part of the existing refractory has fallen off on the inside surface of the steel shell where a new stave cooler is to be installed, with the steel shell and the remaining refractory taken in vertical section (however, illustration of the refrigerant flow path and the water supply and drainage pipes, etc. is omitted). [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. 3 (however, the refrigerant flow path and the water supply and drainage pipes are omitted). [Diagram 5] FIG. 3 is a side view showing the state in which the stave cooler of FIG. 1 and FIG. 2 is attached and fixed to the inside of the steel shell in a case where most of the existing refractory remains on the inside surface of the steel shell where a new stave cooler is to be installed, with the steel shell and the remaining refractory taken in vertical section (however, illustration of the refrigerant flow path and the water supply and drainage pipes, etc. is omitted). [Figure 6]6 is a cross-sectional view taken along line VI-VI in FIG. 5 (however, the refrigerant flow path and the water supply and drainage pipes are omitted). [Figure 7] FIG. 3 is a vertical cross-sectional view showing the upper part of the stave cooler and its mounting structure in a state in which the stave cooler of FIG. 1 and FIG. 2 is mounted and fixed to the inside of the steel shell. [Figure 8] FIG. 5 is a side view showing the installation structure of the stave cooler after installation has been completed through the states (processes) of FIGS. 3 and 4, with the shell and remaining refractory material in vertical section (however, the illustration of the refrigerant flow path and the water supply and drainage pipes is omitted). [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 8 (however, the refrigerant flow path and the water supply and drainage pipes are omitted). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention is a method for installing a stave cooler A when replacing an existing stave cooler with a new stave cooler A in a blast furnace. Therefore, prior to the installation of this stave cooler A, the existing stave cooler is removed. As described above, when replacing a stave cooler, the blast furnace is operated at a reduced scale, the furnace load is reduced until the stave cooler to be replaced is exposed on the inner wall of the furnace, and the furnace is turned off when the stave cooler is exposed. In this state, the stave cooler is removed and a new stave cooler A is installed. In the removal of the existing stave cooler, a hoisting tool suspended from the top of the furnace is connected to the stave cooler, and the cooling piping and the like connected to the stave cooler are disconnected and separated from the steel shell. During this separation, some of the refractory (existing refractory) that was filled in the gap between the steel shell and the back of the stave cooler may fall off, in which case the remaining refractory remains attached to the steel shell. After the stave cooler separated from the steel shell is lifted and carried out from the furnace top, a new stave cooler A is lowered from the furnace top and installed.

[0016] The gist of the method for installing a stave cooler of the present invention is that before installation in a blast furnace, a bank 1 made of a plastic refractory is provided along the periphery of the back of the stave cooler A, and when installing the stave cooler A, the bank 1 is pressed against the steel shell to make tight contact, thereby providing a gap 2 between the steel shell and the back of the stave cooler, the periphery of the gap 2 is sealed with the bank 1, and the gap 2 is filled by injecting unshaped refractory 3. This installation method will be specifically described below. The stave cooler A is installed inside the steel shell B by carrying out the following steps (i) to (iii) in order. (i) Before installation in a blast furnace, a plastic refractory bank 1 is provided on the rear surface of the stave cooler A along its periphery (upper edge, lower edge and both side edges). (ii) When the blast furnace is shut down, the stave cooler A equipped with the plastic refractory bank 1 is attached and fixed to the inside of the steel shell B so that the plastic refractory bank 1 is in close contact with the inside surface of the steel shell. (iii) A gap 2 between the rear part of the stave cooler surrounded by a bank 1 of plastic refractory and the inner surface of the steel shell is filled by injecting amorphous refractory 3 from the steel shell B side. In the present invention, the "inner surface of the shell" includes not only the inner surface of the shell itself, but also the surface of the remaining refractory when the remaining refractory exists on the inner surface of the shell. Therefore, the "inner surface of the shell" means the inner surface of the shell and / or the surface of the remaining refractory on the inner surface of the shell.

[0017] Figures 1 and 2 show a stave cooler A in which a plastic refractory bank 1 is provided along the periphery (upper edge, lower edge and both side edges) of the back surface in the above step (i) (procedure), where Figure 1 is a plan view of the stave cooler A as seen from the back surface, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. 3 and 4, and 5 and 6 respectively show a state in which the stave cooler A of Fig. 1 and Fig. 2 is attached and fixed inside the shell B in the above step (procedure) (however, refrigerant flow paths and water supply and drainage pipes are omitted in Fig. 3 to Fig. 6). Of these, Fig. 3 is a side view showing a state in which the stave cooler A of Fig. 1 and Fig. 2 is attached and fixed inside the shell B in a state in which a part of the existing refractory has fallen off from the inner surface of the shell where the stave cooler A should be installed, with the shell B and the remaining refractory 8 being vertically cross-sectionally shown, and Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 3. 5 is a side view showing a state in which the stave cooler A of Fig. 1 and Fig. 2 is attached and fixed inside the shell B in a state where most of the existing refractory remains on the inner surface of the shell where the stave cooler A should be installed, with the shell B and the remaining refractory 8 being vertically cross-sectionally shown, and Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 5. Fig. 7 is a vertical cross-sectional view showing the upper part of the stave cooler A and its attachment structure in a state in which the stave cooler A of Fig. 1 and Fig. 2 is attached and fixed inside the shell B.

[0018] Here, the plastic refractory is a type of shaped refractory, which is a refractory that itself exhibits plasticity, and is usually a clay-like refractory made by kneading refractory aggregate, fireclay, binder, etc. with water. The inner surface of the shell against which the plastic refractory bank 1 abuts and adheres is often in a rough surface condition with unevenness and steps due to the fact that, depending on the location, there is no remaining refractory 8 due to the fall-off of existing refractory (refractory that was between the existing stave cooler and the shell B) or the thickness of the remaining refractory 8 varies. However, since the plastic refractory that makes up the bank 1 is plastic, it can freely deform to conform to the inner surface of the shell with such a rough surface condition, and when installing the stave cooler A, a specified force is applied to crush and deform the bank 1 (plastic refractory), allowing it to adhere to the inner surface of the shell and achieve a reliable seal.

[0019] The height h (thickness) of the plastic refractory bank 1 is adjusted to a height (thickness) such that an appropriate gap 2 (see Figures 4 and 6) is formed between the back of the stave cooler and the inner surface of the shell and the periphery of the gap 2 is reliably sealed by the bank 1, taking into consideration the following: (1) the shell of a blast furnace is cylindrical, and therefore the inner surface of the shell is curved (arcuate), and (2) as described above, the inner surface of the shell often has a rough surface with unevenness and steps because no remaining refractory 8 exists in some locations due to the fall-off of existing refractory, or the thickness of the remaining refractory 8 varies. As described above, the inner surface of the shell is curved (arcuate), but the stave cooler A is often flat. When installing such a stave cooler A, from the above viewpoint, if the maximum thickness of the remaining refractory 8 adhering to the inner surface of the shell after removing the existing stave cooler is t (mm), and the distance in the furnace radial direction between the curved inner surface of the shell and the center of the width direction of the back of the stave cooler in the state where the stave cooler A is attached and fixed inside the shell B is L (mm) (see Figs. 4 and 6), the height h (mm) of the bank 1 of the plastic refractory preferably satisfies the following formula (1). h = t + L + α … (1) However, 15mm≦α≦30mm

[0020] Here, α in the above formula (1) is a value that allows for a deformation allowance (crushing allowance) when the plastic refractory bank 1 is deformed to conform to the unevenness and steps on the inner surface of the shell. Assuming that the plastic refractory bank 1 abuts and adheres to the area on the inner surface of the shell across the area where the remaining refractory 8 exists and the area where the remaining refractory 8 does not exist, if the height (thickness) of the plastic refractory bank 1 satisfies the above formula (1), the plastic refractory bank 1 will deform to conform to the unevenness and steps on the inner surface of the shell, forming an appropriate gap 2 between the stave cooler A and the shell B, and the periphery of the gap 2 will be reliably sealed by the bank 1.

[0021] In the bank 1 of the plastic refractory, the bank portion 10a along the upper edge of the back surface of the stave cooler is provided with an opening 100 for venting air when the monolithic refractory 3 is injected into the gap 2 inside the bank 1 in the above step (iii) and for confirming that the injection of the monolithic refractory 3 is completed. This opening 100 is formed of a groove or hole (groove in this embodiment) penetrating the bank portion 10a in the width direction. Usually, the size (diameter) of the opening 100 may be about 100 mm. There is no particular restriction on the width w of the bank 1 of the plastic refractory material, but in order to ensure that the bank 1 can reliably seal the periphery of the gap 2 between the stave cooler A and the steel shell B, and to prevent the force that deforms the plastic refractory material from becoming too large when the bank 1 is brought into close contact with the inner surface of the steel shell (as will be described later, the bank 1 of the plastic refractory material is deformed by the fastening force of the bolts that attach the stave cooler A to the steel shell B), the width w of the bank portion 10b of the plastic refractory material bank 1 along both side edges of the back surface of the stave cooler is set to 100 mm. b It is preferable that the width is about 50 to 200 mm, and more preferably about 80 to 100 mm.

[0022] On the other hand, the bank portion 10a along the upper edge of the back surface of the stave cooler and the bank portion 10c along the lower edge of the back surface of the stave cooler are usually provided with a width w a ,w c is preferably configured as follows: In this embodiment, as shown in FIG. 7, a water supply and drainage pipe section 5 for supplying and draining cooling water to and from the refrigerant flow passage 9 inside the stave cooler A is attached to the stave cooler A before it is installed in the blast furnace. The refrigerant flow passage 9 is provided along the vertical direction of the stave cooler A, and a plurality of such refrigerant flow passages 9 are provided at intervals in the width direction of the stave cooler A. The water supply and drainage pipe section 5 for supplying and draining cooling water to and from the refrigerant flow passage 9 is connected to the upper and lower ends (upper and lower ends of each refrigerant flow passage 9) of the stave cooler A. The bank section 10a along the upper edge of the back surface of the stave cooler and the bank section 10c along the lower edge of the back surface of the stave cooler are provided so that the water supply and drainage pipe section 5 penetrates them, so that the width w of the bank section 10a is 100 mm. a and the width w of the bank part 10c c is configured to have a size that allows the water supply and drainage pipe section 5 to pass through. This also makes it possible for a part of the bank section 10a or bank section 10c to close (seal) the gap s between the insertion hole 6 of the shell B and the water supply and drainage pipe section 5, as described later.

[0023] Depending on the shape (method of installation) of the refrigerant flow path 9, the water supply and drainage pipe section 5 may be connected to only one of the upper and lower ends of the stave cooler A. In that case, either the bank section 10a or the bank section 10c may be provided with a width sufficient for the water supply and drainage pipe section 5 to pass through, and the other bank section may have a width equivalent to that of the bank section 10b along both side edges of the back surface of the stave cooler. Normally, when the water supply and drainage pipe section 5 passes through the embankment section 10a or embankment section 10c, the embankment section needs to be constructed with a width sufficient to allow one or two water supply and drainage pipe sections 5 to pass through, and the maximum width is usually about 350 mm.

[0024] In this embodiment, a plastic refractory layer 4 having a thickness thinner than the height (thickness) of the bank 1 of the plastic refractory is provided on the back part of the stave cooler surrounded by the bank 1 of the plastic refractory. In the present invention, in the above-mentioned step (iii) (procedure), the amorphous refractory 3 is injected from the shell B side into the gap 2 between the back part of the stave cooler surrounded by the bank 1 of the plastic refractory and the inner surface of the shell, and when the amorphous refractory 3 injected into the gap 2 leaks out for some reason and the filling of the amorphous refractory 3 in the gap 2 becomes insufficient, the above-mentioned plastic refractory layer 4 is provided to protect the stave cooler A from heat to a minimum extent. The thickness of the plastic refractory layer 4 is arbitrary, but a thickness of about 20 to 30 mm is usually preferable in terms of the relationship with the height (thickness) of the bank 1 and the heat insulating effect.

[0025] Furthermore, if the plastic refractory material used for bank 1 is too hard, it will not easily deform to conform to the irregularities and steps on the inner surface of the steel shell, but if it is too soft, it will not be able to maintain the shape of bank 1; therefore, the moisture content and other factors are adjusted to achieve the appropriate hardness. In addition, after the plastic refractory material is installed as the bank 1 on the back surface of the stave cooler A, it becomes harder and loses its plasticity when moisture evaporates. Therefore, it is preferable to cover the plastic with vinyl or the like after installation to prevent moisture from evaporating as much as possible.

[0026] Next, in the above step (ii) (procedure), the stave cooler A with the plastic refractory bank 1 provided in the above step (i) (procedure) is hung down into the blast furnace when the blast furnace is stopped, and is attached and fixed to the inside of the shell B so that the plastic refractory bank 1 is in close contact with the inside surface of the shell. The stave cooler A is attached and fixed to the shell B using a fixing bolt, and the plastic refractory bank 1 is pressed against the inside surface of the shell by the tightening force of the bolt, and even if there are irregularities or steps on the inside surface of the shell, the plastic refractory bank 1 is deformed (crushed and deformed) to follow the irregularities or steps, and the bank 1 is in close contact with the inside surface of the shell. This forms a gap 2 between the back surface of the stave cooler and the inside surface of the shell, and the periphery of the gap 2 can be reliably sealed. Figures 3 and 4, as well as Figures 5 and 6 show this state, and in particular, even when a part of the existing refractory has fallen off from the inside surface of the steel shell as shown in Figures 3 and 4, and there are large steps or irregularities in the part of the inside surface of the steel shell where the plastic refractory bank 1 abuts and adheres, the plastic refractory bank 1 can deform appropriately and adhere to the inside surface of the steel shell.

[0027] When the stave cooler A is attached and fixed inside the shell B, as shown in FIG. 7, the water supply and drainage pipe section 5 is inserted into an insertion hole 6 provided through the shell B and protrudes (extends) to the outside of the shell B. A sealing metal fitting 7 is provided around the water supply and drainage pipe section 5 protruding from the insertion hole 6 to the outside of the shell B to seal the gap s between the periphery of the insertion hole 6 and the water supply and drainage pipe section 5. The sealing metal fitting 7 is configured such that one end of a short cylinder 70 is joined (welded) to the shell part around the insertion hole 6, and the other end is joined (welded) to the outer periphery of the water supply and drainage pipe section 5 via a flange 71 (inward flange). The sealing metal fitting 7 is called a compensator, and serves to seal so that the gas in the furnace does not flow out of the shell B through the gap s, but also has the function of allowing the water supply and drainage pipe section 5 to deform and move to a certain extent over time. However, if the unshaped refractory 3 injected into the gap 2 in the above-mentioned step (iii) (procedure) penetrates into the sealing metal 7 (compensator) through the gap s, the function will be lost. In contrast, in this embodiment, when the stave cooler A is attached and fixed inside the steel shell B, as shown in Fig. 7, the gap s between the periphery of the insertion hole 6 and the water supply and drainage pipe section 5 is blocked by a part of the bank section 10a (and / or bank section 10c), so that the unshaped refractory 3 can be prevented from penetrating into the sealing metal 7 (compensator) through the gap s. Therefore, the function of the sealing metal 7 is not impaired by the unshaped refractory 3 injected into the gap 2.

[0028] Next, in the above step (iii) (procedure), the unshaped refractory 3 is injected into the gap 2 (the gap 2 between the back part of the stave cooler surrounded by the bank 1 of the plastic refractory and the inner surface of the shell) through the injection hole 11 formed in the shell B, filling the gap 2. As described above, since the plastic refractory constituting the bank 1 is plastic, it adheres closely to the inner surface of the shell by deforming according to the rough surface state of the inner surface of the shell, thereby properly sealing the periphery of the gap 2 and allowing the unshaped refractory 3 to be properly filled and held in the gap 2. When pouring the monolithic refractory 3, an opening 100 formed in the bank portion 10a serves as an air vent, and the completion of pouring the monolithic refractory 3 can be confirmed through this opening 100 (usually by looking into the furnace through a furnace mouth manhole at the top of the furnace). After the pouring of the monolithic refractory 3 is completed, the pouring hole 11 in the steel shell B is closed, and the installation work of the stave cooler is completed.

[0029] The stave cooler A installed through the above-described process (procedure) has a refractory layer formed by the solidification (hardening) of the plastic refractory that made up the bank 1 and the amorphous refractory injected into the gap 2, which is interposed between the stave cooler A and the steel shell B, resulting in an installation structure that does not create a gap between the stave cooler A and the steel shell B. 8 and 9 show the installation structure of the stave cooler A after the installation is completed through the states (processes) of FIGS. 3 and 4, where FIG. 8 is a side view showing the steel shell B and the remaining refractory material 8 in a vertical section, and FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8 (however, refrigerant flow paths and water supply and drainage pipes, etc. are omitted in FIGS. 8 and 9). In other words, in the installation structure of this stave cooler A, a bank-shaped plastic refractory layer 1x (a refractory layer made of the plastic refractory that constituted the bank 1) is interposed between the portion along the peripheral edge of the back of the stave cooler A and the inner surface of the steel shell, and an amorphous refractory layer 3x (a refractory layer made of amorphous refractory 3 injected into the gap 2) is interposed between the back portion of the stave cooler surrounded by this plastic refractory layer 1x and the inner surface of the steel shell, and these refractory layers allow the stave cooler A to be installed inside the steel shell B without creating a gap between it and the steel shell B. The plastic refractory layer 1x is composed of a plastic refractory layer portion 10ax along the upper edge of the back surface of the stave cooler, a plastic refractory layer portion 10bx along both side edges of the back surface of the stave cooler, and a plastic refractory layer portion 10cx along the lower edge of the back surface of the stave cooler.

[0030] In addition, in this embodiment, the rear portion of the stave cooler surrounded by the plastic refractory layer 1x has a plastic refractory layer 4x (a refractory layer made of plastic refractory layer 4) whose thickness is thinner than the thickness of the plastic refractory layer 1x, and an amorphous refractory layer 3x is interposed between this plastic refractory layer 4x and the inner surface of the steel shell. In addition, the stave cooler A is fitted with a water supply and drainage pipe section 5 for supplying and draining cooling water to the refrigerant flow path 9 inside, and this water supply and drainage pipe section 5 penetrates a plastic refractory layer portion 10ax along the upper edge of the back surface of the stave cooler and / or a plastic refractory layer portion 10cx along the lower edge of the back surface of the stave cooler, of the plastic refractory layer 1x. In addition, the water supply and drainage pipe section 5 is inserted into an insertion hole 6 formed through the iron shell B, and a sealing metal fitting 7 is provided around the water supply and drainage pipe section 5 protruding from this insertion hole 6 to the outside of the iron shell B to seal the gap s between the peripheral portion of the insertion hole 6 and the water supply and drainage pipe section 5, and the plastic refractory layer portion 10ax and / or a part of the plastic refractory layer portion 10cx seal the gap s between the peripheral portion of the insertion hole 6 and the water supply and drainage pipe section 5. [Explanation of symbols]

[0031] A Stave Cooler B Iron skin 1. Bank 2 gap 3 Monolithic refractories 4 Plastic refractory layer 5 Water supply and drainage pipe section 6 Insertion hole 7 Sealing hardware 8 Residual refractories 9 Coolant flow path 10a, 10b, 10c Bank 11 Inlet 70 Short Cylinder 71 Flange 100 aperture s Gap 1x Plastic refractory layer 3x monolithic refractory layer 4x plastic refractory layers 10ax, 10bx, 10cx Plastic refractory layer

Claims

1. A method for installing a stave cooler (A) when replacing an existing stave cooler with a new stave cooler (A) in a blast furnace, A plastic refractory bank (1) is provided along the periphery of the back surface of the stave cooler (A) before it is installed in the blast furnace; The stave cooler (A) provided with the plastic refractory bank (1) is attached and fixed to the inside of the steel shell (B) during the blast furnace shutdown so that the plastic refractory bank (1) is in close contact with the inside surface of the steel shell, and then This method for installing a stave cooler in a blast furnace is characterized in that a gap (2) between a back part of the stave cooler surrounded by a bank (1) of plastic refractory and the inner surface of the steel shell is filled by injecting an unshaped refractory (3) from the steel shell (B) side.

2. The stave cooler (A) has a flat plate shape, The method for installing a stave cooler in a blast furnace according to claim 1, characterized in that, when the maximum thickness of the remaining refractory material adhering to the inner surface of the steel shell after the existing stave cooler is removed is t (mm), and the distance in the furnace radial direction between the curved inner surface of the steel shell and the widthwise center of the back surface of the stave cooler in a state in which the stave cooler (A) is attached and fixed inside the steel shell (B) is L (mm), the height h (mm) of the bank (1) of the plastic refractory material satisfies the following formula (1): h=t+L+α...(1) However, 15mm≦α≦30mm

3. The method for installing a stave cooler in a blast furnace according to claim 1 or 2, characterized in that an opening (100) penetrating the width direction of the bank portion (10a) of the plastic refractory bank (1) along the upper edge of the back surface of the stave cooler is formed in the bank portion (10a).

4. The method for installing a stave cooler in a blast furnace according to any one of claims 1 to 3, characterized in that the width of the bank portion (10b) along both side edges of the back surface of the stave cooler of the plastic refractory bank (1) is 50 to 200 mm.

5. The method for installing a stave cooler in a blast furnace according to any one of claims 1 to 4, characterized in that a plastic refractory layer (4) having a thickness thinner than the height of the plastic refractory bank (1) is provided on the back side of the stave cooler surrounded by the plastic refractory bank (1).

6. Before being installed in a blast furnace, the stave cooler (A) is fitted with a water supply and drainage pipe section (5) for supplying and draining cooling water to and from the internal refrigerant flow path. The method for installing a stave cooler in a blast furnace according to any one of claims 1 to 5, characterized in that the plastic refractory bank (1) is provided on the back of the stave cooler (A) so that the water supply and drainage pipe section (5) penetrates the bank section (10a) along the upper edge of the back of the stave cooler and / or the bank section (10c) along the lower edge of the back of the stave cooler.

7. With the stave cooler (A) attached and fixed inside the shell (B), the water supply and drainage pipe section (5) is inserted into an insertion hole (6) formed in the shell (B), and a sealing metal fitting (7) is provided around the water supply and drainage pipe section (5) protruding from the insertion hole (6) to the outside of the shell (B) to seal the gap between the peripheral portion of the insertion hole (6) and the water supply and drainage pipe section (5); The method for installing a stave cooler in a blast furnace according to claim 6, characterized in that a part of the bank portion (10a) and / or the bank portion (10c) is adapted to block a gap between a peripheral portion of the insertion hole (6) and the water supply and drainage pipe portion (5).

8. An installation structure of a stave cooler (A) newly installed in place of an existing stave cooler in a blast furnace due to replacement work, The stave cooler (A) is attached and fixed to the inside of the steel shell (B), A structure for installing a stave cooler in a blast furnace, characterized in that a bank-shaped plastic refractory layer (1x) is interposed between a portion along the peripheral edge of the back surface of the stave cooler (A) and the inner surface of the steel shell, and a moldable refractory layer (3x) is interposed between the back portion of the stave cooler surrounded by the plastic refractory layer (1x) and the inner surface of the steel shell.

9. The installation structure of a stave cooler in a blast furnace according to claim 8, characterized in that a plastic refractory layer (4x) having a thickness thinner than the thickness of the plastic refractory layer (1x) is provided at a rear portion of the stave cooler surrounded by the plastic refractory layer (1x), and an amorphous refractory layer (3x) is interposed between the plastic refractory layer (4x) and the inner surface of the steel shell.

10. The stave cooler (A) is provided with a water supply and drainage pipe section (5) for supplying and draining cooling water to and from the refrigerant flow path therein. The installation structure of the stave cooler in the blast furnace according to claim 8 or 9, characterized in that the water supply and drainage pipe portion (5) penetrates the plastic refractory layer portion (10ax) along the upper edge of the back surface of the stave cooler and / or the plastic refractory layer portion (10cx) along the lower edge of the back surface of the stave cooler, of the plastic refractory layer (1x).

11. The water supply and drainage pipe section (5) is inserted into an insertion hole (6) formed in the shell (B), and a sealing metal fitting (7) is provided around the water supply and drainage pipe section (5) protruding from the insertion hole (6) to the outside of the shell (B) to seal the gap between the peripheral portion of the insertion hole (6) and the water supply and drainage pipe section (5); The installation structure of a stave cooler in a blast furnace according to claim 10, characterized in that the plastic refractory layer portion (10ax) and / or a part of the plastic refractory layer portion (10cx) closes a gap between the peripheral portion of the insertion hole (6) and the water supply and drainage pipe portion (5).

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