Method of constructing cooling stave and cooling stave

Abstract

To provide a construction method of a cooling stave capable of bringing the cooling stave into close contact with an iron shell, and the cooling stave.SOLUTION: The method of installing the cooling stave includes a stave body provided with a cooling pipe through which a cooling fluid flows, a refractory layer formed of a refractory on one surface of the stave body, and a wall portion formed of a refractory on a peripheral edge portion of the refractory layer, and includes a fixing step (step S4) of fixing the stave to the shell of the blast furnace by pressing the wall portion against the shell in a deformable state of the refractory forming the wall portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cooling stave installation method and a cooling stave. [Background technology]

[0002] Cooling staves are installed inside the steel shell of a blast furnace via refractories. The cooling staves deteriorate or become damaged when exposed to high temperatures. Therefore, for example, when the blast furnace is shut down, the deteriorated or damaged cooling stave (hereinafter referred to as a deteriorated cooling stave) is removed from the steel shell, and a new cooling stave (hereinafter referred to as a replacement cooling stave) is attached to the steel shell.

[0003] When a deteriorated cooling stave is removed from the steel shell, refractory may remain on the steel shell. If this occurs, a gap may be formed between the cooling stave and the steel shell when the cooling stave is attached to the steel shell, and high-temperature gas may enter the gap, exposing the steel shell to high temperatures and causing damage.

[0004] As a method for avoiding the above-mentioned risks, Patent Document 1 discloses a technology in which multiple ribs extending in the width direction of the mounting cooling stave are provided on the surface of the mounting cooling stave facing the steel shell. According to Patent Document 1, these ribs can suppress the intrusion of high-temperature gas into the gap and the flow of high-temperature gas through the gap. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-104106 Summary of the Invention [Problem to be solved by the invention]

[0006] The method disclosed in Patent Document 1 has a problem in that if refractory remains on the steel shell, the refractory remaining on the steel shell makes it impossible to adhere the mounting cooling stave to the steel shell.

[0007] The present invention has been made to solve the above-mentioned problems, and has an object to provide a cooling stave installation method that can adhere the cooling stave to the steel shell, and a cooling stave. [Means for solving the problem]

[0008] The means for solving the above problems are as follows. [1] A method for installing a cooling stave, which includes a stave body provided with a cooling pipe through which a cooling fluid flows, a refractory layer formed on one side of the stave body from a refractory material, and a wall portion formed on the periphery of the refractory layer from the refractory material, and which includes a fixing step of pressing the wall portion against the blast furnace shell while the refractory material forming the wall portion is in a deformable state, and fixing the cooling stave to the blast furnace shell. [2] A method for installing a cooling stave as described in [1], wherein a mesh member is arranged inside the refractory layer and the wall portion, and a communication portion is formed in the wall portion that connects the space surrounded by the wall portion with the outside of the wall portion. [3] In the fixing step, bolts are inserted from the outside of the steel shell into each of a plurality of through holes formed in the steel shell to fix the cooling stave to the inside of the steel shell, and washers with cutouts are placed between the bolts and the steel shell to form gaps between the bolts and the steel shell.Furthermore, caps are placed on each of the plurality of bolts and the contact portions between the caps and the steel shell are joined around their entire circumference, and each of the plurality of caps has an injection port for injecting mortar into the inside of the cap.A cooling stave installation method described in [1] or [2]. [4] A method for installing a cooling stave as described in [3], which includes a mortar injection step of injecting mortar from any one of the multiple injection ports located below any other injection port in the height direction of the blast furnace, and then injecting the mortar from any one of the other injection ports. [5] A cooling stave having a stave body provided with a cooling pipe through which a cooling fluid flows, a refractory layer formed on one surface of the stave body by a refractory material, and a wall portion formed by the refractory material on the periphery of the refractory layer, wherein the refractory material forming the wall portion maintains a deformable state. [6] A cooling stave as described in [5], wherein a mesh member is arranged inside the refractory layer and the wall portion, and a communication portion is formed in the wall portion that connects the space surrounded by the wall portion with the outside of the wall portion. [7] The cooling stave according to [6], wherein the mesh member is a wire mesh having a mesh size of 40 mm or less. [Effects of the Invention]

[0009] According to the present invention, the cooling stave can be brought into close contact with the steel shell. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing a method for installing a cooling stave according to the present embodiment. FIG. [Figure 2] FIG. 2 is a perspective view showing a stave body. [Figure 3] 10A to 10C are diagrams illustrating a method for forming a wall portion. [Figure 4] FIG. 1 is a perspective view of an attachment cooling stave. [Figure 5] FIG. 5 is a plan view of the mounting cooling stave shown in FIG. 4. [Figure 6] FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5. [Figure 7] FIG. 7 is an enlarged view of a part of FIG. 6. [Figure 8]FIG. 10 is a diagram illustrating a state in which an attachment cooling stave is fixed to a steel shell by a bolt. [Figure 9] FIG. 10 is a diagram showing the bolt covered with a cap. [Figure 10] FIG. 10 is a diagram illustrating the injection of mortar. [Figure 11] FIG. 10 is a diagram showing the amount of mortar injected during the actual air cessation and the amount of mortar injected during the subsequent air cessation. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of the present invention (hereinafter referred to as the present embodiment) will be described below. The cooling stave according to this embodiment constitutes a part of the furnace wall of a blast furnace. The cooling stave gradually deteriorates due to exposure to high temperatures and may be damaged by collision with raw materials charged into the blast furnace. Hereinafter, a deteriorated or damaged cooling stave will be referred to as a deteriorated cooling stave. The deteriorated cooling stave is removed from the steel shell of the blast furnace during the actual blast furnace shutdown, and a new cooling stave is attached to the steel shell. Hereinafter, the new cooling stave portion will be referred to as an attachment cooling stave. The refractory or mortar that had adhered the deteriorated cooling stave to the inner surface of the steel shell from which the deteriorated cooling stave was removed may remain, causing unevenness. Note that the actual blast furnace shutdown refers to stopping the supply of air to the interior of the blast furnace for a predetermined number of days in order to perform maintenance on the blast furnace.

[0012] Therefore, in the mounting cooling stave of this embodiment, the portion of the mounting cooling stave that comes into contact with the inner surface of the steel shell is designed to deform according to the shape of the inner surface of the steel shell. By doing so, even if the inner surface of the steel shell is uneven, the wall portion is brought into close contact with the inner surface of the steel shell, thereby preventing gaps from occurring between them. Hereinafter, the portion of the mounting cooling stave that comes into contact with the inner surface of the steel shell will be referred to as the wall portion.

[0013] Fig. 1 is a diagram showing an example of a method for installing a cooling stave according to this embodiment. In the example shown in Fig. 1, in the wall portion forming step S1, a refractory layer is formed on one surface of the stave body of the mounting cooling stave, and a wall portion is formed along the peripheral portion of the refractory layer.

[0014] Here, the stave body and the method of forming the refractory layer and wall portion on the stave body will be described. FIG. 2 is a perspective view showing a stave body 1. A cooling pipe (not shown) is arranged inside the stave body 1 shown in FIG. 2. A supply pipe 2 that supplies cooling fluid to the cooling pipe and a discharge pipe 3 that discharges the cooling fluid from the cooling pipe are connected. In the example shown in FIG. 2, the supply pipe 2 extends from the stave body 1 in the thickness direction of the stave body 1 at the upper end side of the stave body 1 in the height direction of the stave body 1. Furthermore, the discharge pipe 3 extends from the stave body 1 in the thickness direction of the stave body 1 at the lower end side of the stave body 1. The protruding lengths of the supply pipe 2 and the discharge pipe 3 from the stave body 1 are set to lengths that allow their tips to protrude outside the steel shell when an attachment cooling stave is attached to the steel shell (not shown). Note that the height direction of the stave body 1 refers to the height direction of the stave body 1 when the attachment cooling stave is attached to the steel shell. That is, the height direction of the stave body 1 means the height direction of the blast furnace.

[0015] A plurality of fixing parts 4 for fixing the mounting cooling staves to the steel shell are provided in the center of the stave body 1 in the height direction of the stave body 1. In the example shown in Fig. 2, six fixing parts 4 are provided. The fixing parts 4 are composed of protrusions protruding from the stave body 1 and female threads formed on the protrusions. Bolts are screwed into these fixing parts 4 from the outside of the steel shell to fix the mounting cooling staves to the steel shell.

[0016] The shell has through-holes formed therein that penetrate the thickness direction of the shell, into which the supply pipe 2 and the discharge pipe 3 are inserted. When the mounting cooling stave is attached to the shell, the supply pipe 2 and the discharge pipe 3 are inserted into the respective through-holes. A cooling fluid supply source is connected via piping to the tip of the supply pipe 2 that protrudes outside the shell. A drain location is connected via another piping to the tip of the discharge pipe 3 that protrudes outside the shell.

[0017] The shell also has a plurality of bolt through-holes formed in a pattern substantially identical to the arrangement pattern of the fixing portions 4. These through-holes will be referred to as bolt holes hereinafter. The inner diameter of each bolt hole is set larger than the outer diameter of the bolt inserted into the fixing portion 4.

[0018] The method for forming the refractory layer and wall portion will now be described. FIG. 3 is a diagram illustrating the method for forming the wall portion. As shown in FIG. 3(A), a first lath mesh 5 is placed over almost the entire surface of one side of the stave body 1 of the mounting cooling stave, and refractory is applied to the first lath mesh 5. This covers one side of the stave body 1 with refractory, forming a refractory layer 6 that protects it from high temperatures in the blast furnace. The first lath mesh 5 is a base material that prevents the refractory from spalling and may be a conventionally known material. An example of the first lath mesh 5 is a stainless steel wire mesh with a mesh size of 40 mm. Because the first lath mesh 5 is a base material, it is preferable that it is not exposed to the outside of the refractory layer 6. Therefore, the size of the first lath mesh 5 is smaller than the size of the refractory layer 6. Note that in FIG. 3, the supply pipe 2, discharge pipe 3, and fixing portion 4 are omitted for simplicity.

[0019] Next, as shown in Fig. 3(B), a second lath net 7 is placed along the peripheral edge of the refractory layer 6. Furthermore, as shown in Fig. 3(B), the second lath net 7 is not placed in the area where a communication section (described later) will be formed. Thereafter, a refractory material is applied to the second lath net 7 to form a wall section 8 along the peripheral edge of the refractory layer 6.

[0020] Fig. 4 is a perspective view of the mounting cooling stave 11 according to this embodiment, on which the refractory layer 6 and the wall portion 8 are formed. Fig. 5 is a plan view of the mounting cooling stave 11 shown in Fig. 4. As shown in Figs. 4 and 5, the wall portion 8 is formed along the peripheral edge of the refractory layer 6. A communication portion 10 is formed in the wall portion 8 on the upper end side in the height direction of the mounting cooling stave 11, connecting the space 9 surrounded by the wall portion 8 with the outside. In addition, the supply pipe 2 and the discharge pipe 3 extend from the wall portion 8.

[0021] Fig. 6 is a cross-sectional view taken along line AA in Fig. 5. Fig. 7 is an enlarged view of a portion of Fig. 6. As shown in Figs. 6 and 7, a wall portion 8 is formed on the peripheral edge of one surface of the mounting cooling stave 11. A first lath net 5 and a second lath net 7 are arranged inside the wall portion 8 with a gap therebetween in the thickness direction of the mounting cooling stave 11, and the lath nets 5, 7 are coated with refractory.

[0022] The second lath mesh 7 is a base material that suppresses the spalling of the refractory material, similar to the first lath mesh 5, and may be a conventionally known material. An example of the second lath mesh 7 is a stainless steel wire mesh with a mesh size of 40 mm. Because the second lath mesh 7 is a base material, it is preferable that it is not exposed to the outside of the wall portion 8. Therefore, the size of the second lath mesh 7 is smaller than the size of the wall portion 8. The above-mentioned first lath mesh 5 and second lath mesh 7 correspond to the mesh members of this embodiment.

[0023] Space 9 is where mortar is poured when fixing mounting cooling stave 11 to the steel shell. In other words, wall 8 secures space 9 where mortar is poured, and the height of wall 8 and the width of wall 8 in the width direction of mounting cooling stave 11 are determined by design.

[0024] The communicating portion 10 suppresses a pressure increase within the space 9 when mortar is injected into the space 9. If an excess of mortar is supplied into the space 9 and the internal pressure of the space 9 becomes excessive, the wall portion 8 may be damaged. For this reason, it is preferable that the width of the communicating portion 10 in the width direction of the mounting cooling stave 11 is set to, for example, 100 mm or more. This is because if the width of the communicating portion 10 is less than 100 mm, the communicating portion 10 may be blocked by mortar, preventing the mortar from flowing through the communicating portion 10. By setting the width of the communicating portion 10 to 100 mm or more, if an excess of mortar is supplied into the space 9, the excess mortar will flow through the communicating portion 10 and out of the space 9, thereby suppressing the internal pressure of the space 9 from becoming excessive.

[0025] The refractory may be a conventionally known powdery or clayey monolithic refractory, but is preferably clayey. This is to prevent the refractory from falling off the cooling stave 11 when the cooling stave 11 is lifted by a crane and transported into the blast furnace, as will be described later. Examples of the refractory that constitutes the bank portion such as the wall portion 8 include conventionally known plastic refractories. The refractory is mixed with water before use.

[0026] Mortar is a type of refractory material that is mixed with water to adjust it to a flowable state, and then, as will be described later, is pumped into space 9 by a pump (not shown). As the mortar, a conventionally known refractory mortar can be used.

[0027] Returning to the explanation of FIG. 1 , the wall formation step of step S1 in FIG. 1 is followed by a curing step of step S2. In the curing step of step S2, the wall 8 is covered with a cover member (not shown), and the mounting cooling stave 11 is left in that state for a predetermined period of time. This allows the wall 8 to harden to a certain extent. The wall 8 is not completely hardened, and remains deformable. This is to prevent the refractory from peeling off from the mounting cooling stave 11 when the mounting cooling stave 11 is lifted by a crane (not shown) and transported into the blast furnace, as will be described later. Also, this is to allow the wall 8 to deform in accordance with the shape of the steel shell when pressed against the steel shell.

[0028] The cover member may be any member capable of preventing the wall portion 8 from drying out. For example, a sheet-like member made of synthetic resin may be used as the cover member. The predetermined period is the period required for the refractory material to harden to a certain extent. This period is determined depending on the type of refractory material and the amount of water mixed with the refractory material when applying it to the lath meshes 5 and 7, and can be determined in advance by experiment.

[0029] After a predetermined period of time has elapsed in the curing step of step S2, the process proceeds to the transportation step of step S3. In the transportation step of step S3, first, the cover member is removed from the wall portion 8, and the installation cooling stave 11 is lifted up by a crane. The installation cooling stave 11 is then inserted into the interior of the blast furnace through an opening at the top of the blast furnace. The installation cooling stave 11 is then lowered by the crane to a height approximately equal to the inner surface of the steel shell to which it is to be attached.

[0030] Then, the process proceeds to the fixing step of step S4. In the fixing step of step S4, for example, a bar with a hook is inserted into the inside of the blast furnace through a bolt hole formed in the steel shell, and the hook is hooked onto the mounting cooling stave 11. The bar is then pulled out of the blast furnace, and the mounting cooling stave 11 is pulled to the inner surface of the steel shell. In addition, the supply pipe 2 and the discharge pipe 3 are inserted into the through holes formed in the steel shell, and the fixing parts 4 are aligned with the bolt holes, and bolts are screwed into the fixing parts 4.

[0031] When a bolt is screwed into the fixing portion 4, a load corresponding to the screwing amount is generated, and the wall portion 8 is pressed against the inner surface of the steel shell by this load. As described above, the wall portion 8 of the mounting cooling stave 11 is not completely hardened and remains deformable. Therefore, when the wall portion 8 is pressed against the inner surface of the steel shell by the load, the wall portion 8 deforms according to the surface shape of the steel shell. Therefore, even if the inner surface of the steel shell is uneven, the steel shell and the wall portion 8 of the mounting cooling stave 11 will adhere to each other.

[0032] 8 is a diagram illustrating the state in which the mounting cooling stave 11 is fixed to the steel shell 13 with the bolt 12. As shown in FIG. 8, the bolt 12 is inserted into the bolt hole 15 via the washer 14, and the mounting cooling stave 11 is fixed to the steel shell 13 with the bolt 12. The inner diameter of the washer 14 is smaller than the outer diameter of the head 12a of the bolt 12, and the outer diameter of the washer 14 is larger than the inner diameter of the bolt hole 15. In addition, the washer 14 has a notch 16 formed therein that extends radially. Therefore, when the mounting cooling stave 11 is bolted to the steel shell 13, a gap 17 is formed between the bolt 12 and the steel shell 13, as shown in FIG.

[0033] Thereafter, as shown in FIG. 9 , caps 18 are placed on the heads 12a of the bolts 12, and the contact portions between the caps 18 and the steel shell 13 are joined around the entire circumference. There is no particular limitation on the means for joining the contact portions between the caps 18 and the steel shell 13, but examples of such joining methods include welding and brazing. The caps 18 described above have injection ports 19 formed on the inside for injecting mortar. Since the mounting cooling stave 11 described above has six fixing portions 4, the bolt holes 15 are formed in the same arrangement pattern as the fixing portions 4. Bolts 12 are inserted into the bolt holes 15, respectively, to fix the mounting cooling stave 11 to the steel shell 13. Then, the bolts 12 are each covered with a cap 18.

[0034] Following the fixing process of step S4, the process proceeds to a mortar injection process of step S5. In the mortar injection process of step S5, a mortar transport pipe (not shown) is connected to the injection port of one of the six caps 18 joined to the steel shell 13 that is located on the lower side in the height direction of the blast furnace. A mortar supply source (not shown) and a pump (not shown) are connected to the transport pipe, and the mortar is pressure-fed by the pump toward the attached cooling stave 11.

[0035] FIG. 10 illustrates the injection of mortar. As indicated by the arrows in FIG. 10, mortar is injected into the cap 18 through the injection port 19 and into the space 9 through the gap 17. If the volume of mortar injected exceeds the capacity of the space 9, the excess mortar will flow through the communication part 10 and leak into the blast furnace. Therefore, by observing the interior of the blast furnace, it is possible to determine whether the mortar has filled the space 9. Once the mortar leakage is confirmed, the pump can be stopped to stop the injection of mortar. Alternatively, the volume of the space 9 can be calculated, and once the pump has pumped the mortar to that volume, the pump can be stopped to stop the injection of mortar. Alternatively, when the space 9 is filled with mortar, the pressure of the pump pumping the mortar increases. Therefore, when the pressure of the pump pumping the mortar increases, it can be determined that the space 9 is sufficiently filled with mortar and the injection of mortar can be stopped. This completes the construction method shown in the flowchart of FIG. 1.

[0036] (Actions and Effects) In this embodiment, a wall portion 8 is formed on the stave body 1 of the mounting cooling stave 11, thereby securing a space 9 into which mortar is poured to adhere the mounting cooling stave 11 to the inner surface of the steel shell 13. Furthermore, the refractory forming the wall portion 8 is pressed against the inner surface of the steel shell 13 before it has completely hardened. Therefore, even if the inner surface of the steel shell 13 is uneven, the wall portion 8 deforms according to the surface shape of the inner surface of the steel shell 13, allowing the walls to adhere tightly to each other. Furthermore, a first lath net 5 and a second lath net 7 are provided inside the refractory layer 6 and the wall portion 8. Therefore, when the mounting cooling stave 11 is lifted by a crane and transported into a blast furnace, the refractory forming the refractory layer 6 and the wall portion 8 is supported by the lath nets 5 and 7. As a result, the refractory can be prevented from falling off the mounting cooling stave 11 when the mounting cooling stave 11 is transported into a blast furnace.

[0037] Furthermore, in the mortar injection step of step S5, if mortar is injected in an amount exceeding the volume of the space 9, the excess mortar is discharged to the outside through the communication part 10. This makes it possible to prevent the internal pressure of the space 9 from becoming excessive and damaging the wall part.

[0038] The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, two lath meshes 5, 7 are arranged in the refractory layer 6 and the wall portion 8. However, three or more lath meshes may be arranged instead. This allows the refractory to be supported better than in the present embodiment and can further prevent the refractory from spalling. Furthermore, rod-shaped members such as reinforcing bars extending in the thickness direction of the mounting cooling stave 11 may be arranged in the wall portion 8, and the lath meshes 5, 7 may be connected to the rod-shaped members. This also allows the refractory to be supported and can prevent the refractory from spalling. [Example]

[0039] Example 1, which was conducted to confirm the effects of this embodiment, will be described. As Example 1, an attachment cooling stave configured similarly to the attachment cooling stave 11 of this embodiment was prepared. In the attachment cooling stave of Example 1, a refractory layer was formed on one side of the stave body, and a wall portion was formed around the periphery. Furthermore, a lath mesh was disposed inside both the refractory layer and the wall portion. As Example 2, an attachment cooling stave was prepared in which a lath mesh was disposed inside the refractory layer but not inside the wall portion. In both Example 1 and Example 2, after the refractory layer and the wall portion were formed on the stave body, the wall portion was covered with a cover and cured for a predetermined period. Therefore, the wall portion of each attachment cooling stave of Examples 1 and 2 remained deformable. After curing, the attachment cooling stave of Example 1 and the attachment cooling stave of Example 2 were each lifted by a crane, transported to the inside of a blast furnace, and attached to the inner surface of the steel shell. This was carried out three times for each of Invention Examples 1 and 2, and the presence or absence of spalling of the refractory was evaluated.

[0040] As a comparative example, an attachment cooling stave having a wall formed in the same manner as the attachment cooling stave of Example 1 was prepared. The attachment cooling stave of the comparative example was cured without covering the wall, and the wall was dried. Therefore, the wall of the attachment cooling stave of the comparative example did not maintain a deformable state. As in Examples 1 and 2, the attachment cooling stave of the comparative example was lifted by a crane, transported into the inside of the blast furnace, and attached to the inner surface of the steel shell. This was done three times, and the presence or absence of refractory spalling was evaluated.

[0041] As a result, with the mounting cooling stave of Example 2, refractory spalling occurred two out of three times. In contrast, with the mounting cooling staves of Example 1 and the comparative example, refractory spalling did not occur even once. In addition, in Examples 1 and 2, the steel shell and the mounting cooling stave had good adhesion, and no gaps were formed between them. In contrast, with the mounting cooling stave of the comparative example, the wall portion did not maintain a deformable state, and it was visually confirmed that a gap had formed between the steel shell and the mounting cooling stave of the comparative example. Thus, with the mounting cooling stave of the comparative example, it was not possible to adhere the mounting cooling stave of the comparative example to the steel shell. [Example]

[0042] Example 2, which was conducted to confirm whether mortar had been sufficiently injected into the space between the inner surface of the steel shell and an attachment cooling stave fixed to the inner surface of the steel shell, will be described. As Example 3, an attachment cooling stave with a communication portion formed in a portion of the wall was prepared, similar to the present embodiment and the above-described Example 1. During the blast furnace's production shutdown, the attachment cooling stave of Example 3 was attached to the inner surface of the steel shell. Mortar was then injected into the space between the attachment cooling stave of Example 3 and the steel shell using the injection port of one of the six caps attached to the steel shell that was located lower in the height direction of the blast furnace. When mortar leakage was confirmed by observing the inside of the blast furnace or when the pressure of the pump pumping the mortar increased, it was determined that mortar had been sufficiently injected into the space, and the injection of mortar was stopped and the amount of mortar injected was recorded.

[0043] Then, during the post-maintenance shutdown of the blast furnace after the main shutdown, mortar was again injected using the injection port of one of the six caps attached to the shell that was located higher in the height direction of the blast furnace. The amount of mortar injected at that time was also recorded. The amounts of mortar injected during the main shutdown and the post-maintenance shutdown of Example 3 are shown together in Figure 11. The amount of mortar that could be injected into the space described above was calculated, and this calculated value was used as the threshold value for the amount of mortar injected. This threshold value is also shown in Figure 11.

[0044] It was found that by injecting mortar using the cap that is located lower in the height direction of the blast furnace out of the six caps during the actual shutdown, it was possible to sufficiently fill the spaces in more than half of the installed cooling staves with mortar, as shown in Figure 11. It was also found that for installed cooling staves whose injection amount has not reached the threshold, it was possible to sufficiently fill the spaces by injecting mortar using the cap that is located higher in the height direction of the blast furnace out of the six caps during the post-shutdown. [Explanation of symbols]

[0045] 1 Stave body 2 Supply pipe 3 Discharge pipe 4 Fixed part 5. First Last Net 6 Refractory layer 7 Second Last Net 8 Wall section 9 Space 10 Communication part 11 Cooling stave for installation 12 volts 12a Bolt head 13 Ironhide 14 Washer 15 bolt holes 16 Cutout 17 Gap 18 Cap 19 Mortar injection port Step S1: Wall formation process Step S2: Curing process Step S3: Transport process Step S4 Fixation process Step S5 Mortar injection process

Claims

1. A cooling stave having a stave body provided with a cooling pipe through which a cooling fluid flows, a refractory layer formed on one surface of the stave body by a refractory material, and a wall portion formed by the refractory material on the periphery of the refractory layer, is attached to the iron shell of a blast furnace. A cooling stave installation method comprising a fixing step of pressing the wall portion against the steel shell while the refractory forming the wall portion is in a deformable state to deform the wall portion, and fixing the cooling stave to the steel shell.

2. a mesh member is disposed inside the refractory layer and the wall portion, The cooling stave installation method according to claim 1, wherein a communication portion that communicates the space surrounded by the wall portion with the outside of the wall portion is formed in the wall portion.

3. In the fixing step, bolts are inserted from the outside of the steel shell into each of a plurality of through holes formed in the steel shell to fix the cooling stave to the inside of the steel shell, and washers having cutouts are placed between the bolts and the steel shell to form gaps between the bolts and the steel shell, and further, caps are placed on each of the plurality of bolts and the contact portions between the caps and the steel shell are joined around the entire circumference, The cooling stave installation method according to claim 1 or 2, wherein each of the plurality of caps has an injection port formed therein for injecting mortar into the inside of the cap.

4. 4. The cooling stave construction method according to claim 3, further comprising: injecting mortar from any one of the plurality of injection ports located below any other injection port in the height direction of the blast furnace, and then injecting the mortar from any other injection port.

5. A cooling stave having a stave body provided with a cooling pipe through which a cooling fluid flows, a refractory layer formed by a refractory material on one surface of the stave body, and a wall portion formed by the refractory material on the peripheral portion of the refractory layer. The refractory material forming the wall portion of the cooling stave remains deformable.

6. a mesh member is disposed inside the refractory layer and the wall portion, The cooling stave according to claim 5, wherein a communication portion is formed in the wall portion, the communication portion communicating a space surrounded by the wall portion with an outside of the wall portion.

7. The cooling stave according to claim 6, wherein the mesh member is a wire mesh having a mesh size of 40 mm or less.

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