JP6594724B2 - Copper stave cooler and manufacturing method - Google Patents

Description

  The present invention relates to a copper stave cooler installed on a blast furnace inner wall surface and a manufacturing method.

In the blast furnace, a stave cooler is installed on the inner surface of the iron skin in order to protect the iron skin from the high temperature in the furnace. The stave cooler has a cooling water passage formed therein, and obtains the desired cooling performance by circulating cooling water supplied from the outside of the iron skin.
Instead of conventional cast iron stave coolers, copper stave coolers (including copper alloys) with higher cooling efficiency have been adopted in recent years.

As a copper stave cooler, a structure in which piping for forming a cooling water channel is embedded in a copper or copper alloy stave body is used (see Patent Document 1).
Such a copper stave cooler is manufactured by placing a pipe processed into a predetermined shape in a sand mold for casting, injecting a molten copper or copper alloy into the sand mold, and casting the pipe into the stave body. Is done.

  In Patent Document 1, among pipes (cooling steel pipes) forming a cooling water channel, pipes having a diameter larger than that of the pipes are provided on the outer peripheral side of a portion protruding from the stave cooler body to the outside of the furnace (protective pipe). Place as. Thus, the projecting portion of the cooling steel pipe is reinforced by forming a double pipe with the cooling steel pipe and the outer pipe.

Japanese Patent No. 4823444

By the way, in the manufacture of a copper stave cooler, when a molten metal of copper or copper alloy is poured into the sand mold, the molten metal surface gradually rises from the bottom of the sand mold, so that the pipe contacts the molten metal from the lower part first. And is greatly heated and deformed in the lower part, particularly in the longitudinal direction.
The protruding portion of the pipe tilts due to the thermal expansion deformation, but the tilting is restricted when the protruding portion contacts the outer tube.
Here, in the copper stave cooler of Patent Document 1, since one outer pipe is formed to have a length dimension necessary for protecting the pipe, the tilting area of the protruding portion of the pipe is expanded. However, the tilting is restrained, and thermal stress is generated in the piping, which may lead to manufacturing defects.

  An object of the present invention is to provide a copper stave cooler that can be manufactured while suppressing thermal stress applied to a cooling pipe during casting, and a manufacturing method.

The copper stave cooler of the present invention comprises a copper stave body, a cooling pipe that forms a cooling water channel inside the stave body, and a protective pipe that protects the cooling pipe, and the cooling pipe is A cooling pipe part disposed inside the stave body; and a take-out pipe part protruding from the stave body continuously to the cooling pipe part, wherein the protective pipe is arranged on the outer peripheral side of the take-out pipe part. A copper stave cooler, wherein the protection tube includes a first protection tube connected to the stave body, and a first protection tube that can extend to an end of the first protection tube along a longitudinal direction of the first protection tube . It is characterized by comprising two protective tubes.

The copper stave cooler of the present invention is manufactured as follows. First, a sand mold for casting is prepared, a first protective pipe is installed on the upper mold of the sand mold, an extraction pipe portion is inserted into the first protective pipe, and a cooling pipe is arranged in the sand mold. Next, a copper or copper alloy melt for forming the stave body is poured into the sand mold, and one end of the cooling pipe part and the first protective pipe is cast into the copper or copper alloy. After casting, after cooling and solidification of the copper or copper alloy, the sand mold is removed, and the second protective tube is connected to the first protective tube. In this way, a copper stave cooler is manufactured.
During the above-described casting, the molten metal surface gradually rises from the bottom in the sand mold, so the cooling pipe part is heated from the bottom first, and the lower part is greatly expanded and deformed compared to the other parts. Then, tilting occurs in the take-out pipe part continuous with the cooling pipe part.
Here, since the protective pipe for protecting the cooling pipe is divided into the first protective pipe and the second protective pipe, the cooling pipe is cast without connecting the second protective pipe to the first protective pipe. Can be included.
Since the length of the first protective tube is shorter than the required length of the entire protective tube required to protect the extraction tube, the extraction tube can be tilted by the thermal expansion deformation of the cooling pipe. The area can be expanded. Accordingly, it is possible to reduce the restraint of the tilt of the take-out pipe part due to the contact of the take-out pipe part with the first protective pipe, and it is possible to suppress the generation of thermal stress in the cooling pipe based on the contact.
Moreover, the required length dimension required in order to protect an extraction pipe part can be ensured by connecting a 2nd protective pipe to a 1st protective pipe after casting.

In the copper stave cooler of the present invention, the outer diameter of the first protective tube is set larger than the outer diameter of the second protective tube, and the inner diameter of the first protective tube is larger than the outer diameter of the second protective tube. Is preferably set to be small.
According to such a configuration, since the step portion is formed at the abutting portion between the first protective tube and the second protective tube, fillet welding can be performed from the length direction side of the first protective tube and the second protective tube. . For this reason, for example, even when the intervals between the plurality of extraction pipe portions are arranged so narrow that they cannot be fixed by welding or the like from the direction side orthogonal to the length direction of the first protective tube and the second protective tube. The first protective tube and the second protective tube can be easily connected.

In the copper stave cooler of the present invention, it is preferable that the outer diameter and the inner diameter of the first protective tube are set larger than the outer diameter of the second protective tube.
According to such a configuration, the second protective tube can be connected by being inserted into the first protective tube. Therefore, for example, even when a bending stress is applied to the first protective tube and the second protective tube due to thermal deformation of a copper stave cooler used in the blast furnace, a crack or the like occurs in the connection portion. Since the insertion portion of the second protective tube hits the inner surface of the first protective tube, it is possible to prevent the first protective tube and the second protective tube from hitting the take-out pipe portion. For this reason, an excessive bending stress does not generate | occur | produce in cooling piping because an extraction pipe part contacts a 2nd protective pipe, and generation | occurrence | production of the fatigue crack of cooling piping can be suppressed.
Moreover, fillet welding can be performed from the length direction side of the first protective tube and the second protective tube.
Furthermore, since the inner diameter of the first protective tube is set larger than the outer diameter of the second protective tube, the clearance between the cooling pipe and the first protective pipe can be formed large. For this reason, for example, compared with the case where the 1st protection pipe and the 2nd protection pipe are the same diameter, the field where tilting of the extraction pipe part by the thermal expansion deformation of the cooling pipe at the time of casting can be secured largely.

In the copper stave cooler according to the present invention, the first protective tube has a length dimension that fits in the furnace when the stave body is installed in a blast furnace, and the outer diameter of the first protective tube is the cooling pipe. It is preferable to make it larger than the opening diameter of the blast furnace core through which the take-out portion and the second protective tube are inserted.
According to such a configuration, the first protective tube is located in the furnace with the copper stave cooler installed in the blast furnace. For this reason, when a copper stave cooler is going to deform | transform excessively, an excessive deformation | transformation of a copper stave cooler can be suppressed because a 1st protection pipe end part contacts the furnace inner surface of an iron skin.

  The manufacturing method of the present invention is a manufacturing method for manufacturing the above-described copper stave cooler of the present invention, in which a first protection pipe is installed in the upper mold of the sand mold, and an extraction pipe portion of a cooling pipe is installed in the first protection pipe And inserting the cooling pipe into the sand mold, injecting a molten copper or copper alloy for forming the stave body into the sand mold, and the cooling pipe section of the cooling pipe and the first One end of the protective tube is cast and connected, and after casting, the second protective tube is connected to the other end of the first protective tube.

According to the manufacturing method of the present invention, when one end of the cooling pipe part and the first protective pipe is cast into copper or a copper alloy, the molten metal surface gradually rises from below in the sand mold, The cooling pipe is heated first from the lower side, and the lower part is thermally expanded larger than the other parts, and the take-out pipe part continuous with the cooling pipe part tilts. Due to this tilting, the take-out pipe part approaches the inner surface of the first protective pipe, but the first protective pipe is separated from the second protective pipe, and is a protective pipe required to protect the take-out pipe part. Since the length is shorter than the required length, the region where the extraction pipe can be tilted can be expanded by thermal expansion deformation of the cooling pipe. Accordingly, it is possible to reduce the restraint of the tilt of the take-out pipe part due to the contact of the take-out pipe part with the first protective pipe, and it is possible to suppress the generation of thermal stress in the cooling pipe based on the contact. Since the second protective tube is not connected to the first protective tube at the time of casting described above, it does not interfere with the take-out tube portion.
Moreover, the required length dimension required in order to protect an extraction pipe part can be ensured by connecting a 2nd protective pipe to a 1st protective pipe after casting.

  ADVANTAGE OF THE INVENTION According to this invention, the copper stave cooler and manufacturing method which can suppress and manufacture the thermal stress loaded on cooling piping at the time of casting can be provided.

The longitudinal cross-sectional view which shows the copper stave cooler which concerns on embodiment of this invention. The top view which shows the copper stave cooler which concerns on the said embodiment. Explanatory drawing which shows the principal part of the copper stave cooler which concerns on the said embodiment from the furnace outer side. The longitudinal cross-sectional view which shows the principal part of the copper stave cooler which concerns on the said embodiment. The flowchart which shows the manufacturing process of the copper stave cooler which concerns on the said embodiment. The longitudinal cross-sectional view which shows the casting state of the copper stave cooler which concerns on the said embodiment. The top view which shows the principal part of the copper stave cooler which concerns on other embodiment of this invention. The longitudinal cross-sectional view which shows the casting state of the copper stave cooler which concerns on the said other embodiment.

[Configuration of this embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
The copper stave cooler 1 according to the first embodiment shown in FIGS. 1 to 3 is installed and cooled inside the iron skin 4 in order to protect the iron skin 4 from high-temperature gas in the blast furnace.
A gap for installing the copper stave cooler 1 is provided between the iron skin 4 and the copper stave cooler 1 and between the copper stave coolers 1, and the gap is filled with a filler such as castable.

The copper stave cooler 1 includes a stave body 10, a plurality of cooling pipes 20, and a protective pipe 8.
A plurality of cooling pipes 20 are cast inside the stave body 10, and protective pipes 8 are respectively disposed on the outer peripheral sides of take-out pipe portions 22 and 23 (to be described later) of the plurality of cooling pipes 20.
The protection tube 8 is configured to have a necessary length dimension required to protect the extraction tube portions 22 and 23 by the first protection tube 30 and the second protection tube 40.

The stave body 10 is formed to be curved along the blast furnace core 4. A plurality of projecting portions 11 projecting in a shelf shape toward the furnace body are formed on the surface inside the furnace body of the stave body 10. A groove portion is formed between the plurality of protruding portions 11.
On the surface of the stave body 10 on the outside of the furnace, a casting bulging portion 12 into which one end portion 31 (see FIG. 4A) of the first protective tube 30 is cast, and a fixing bolt 2 is fixed. A bulging portion 13 is formed. The cast-out bulges 12 are arranged in the upper part and the lower part of the stave body 10, respectively. The fixing bulging portion 13 is disposed between the upper and lower cast bulging portions 12. A nut is cast in the fixing bulging portion 13 and is fixed to the iron skin 4 by the fixing bolt 2 as shown in FIG.

The plurality of cooling pipes 20 have a cylindrical cross section and are arranged at predetermined intervals in the left-right direction shown in FIG. In this embodiment, five cooling pipes 20 are arranged.
As shown in FIG. 1, each cooling pipe 20 is formed in a substantially U shape, and includes a cooling pipe part 21 and extraction pipe parts 22 and 23 continuing to the cooling pipe part 21.
The cooling pipe portion 21 is provided so as to extend in the vertical direction inside the stave body 10, and forms the cooling water passage 3 inside the stave body 10.
The take-out pipe portion 22 is formed continuously from the lower end portion of the cooling pipe portion 21 and is configured as a feed water take-out pipe portion that protrudes outward from the casting bulge portion 12 in the lower portion of the stave body 10. .
The take-out pipe part 23 is formed continuously from the upper end part of the cooling pipe part 21, and is configured as a drainage take-out pipe part protruding outward from the casting bulging part 12 in the upper part of the stave body 10.

The first protective tube 30 is formed by a pipe having a cylindrical cross section.
The end portions 31 of the first protective tubes 30 are respectively casted into the casting bulging portion 12 in the upper portion and the casting bulging portion 12 in the lower portion of the stave body 10. It is arranged to project outward.

As shown in FIG. 4A, the outer diameter of the first protective tube 30 is larger than the outer diameter of the second protective tube 40, and the inner diameter of the first protective tube 30 is The dimension is larger than the inner diameter dimension of the second protective tube 40 and smaller than the outer diameter dimension of the second protective tube 40. For this reason, the other end portion 32 of the first protective tube 30 and the end portion 41 (end portion on the first protective tube 30 side) of the second protective tube 40 come into contact with each other to form the stepped portion 33. The second protective tube 40 is connected to the first protective tube 30 by the fillet welded from above.
The inner diameter dimension of the first protective tube 30 may be equal to or larger than the outer diameter dimension of the second protective tube 40 as shown in FIG. In this case, the end 41 of the second protective tube 40 is inserted from the end 32 of the first protective tube 30, and the outer peripheral surface of the second protective tube 40 and the end 32 of the first protective tube 30 are connected by fillet welding. Connected.

The length L1 (see FIG. 4 (A)) from one end surface to the other end surface of the first protective tube 30 is determined from the surface of the casting bulge portion 12 in the state where the copper stave cooler 1 is installed in the blast furnace. The outer diameter of the first protective tube 30 is set to be shorter than the distance A to the furnace inner surface (see FIG. 1), and the opening diameter of the iron skin 4 through which the extraction portion of the cooling pipe 20 and the second protective tube 40 are inserted. Is set larger than. For this reason, the first protective tube 30 is accommodated inside the furnace than the iron skin 4 when the copper stave cooler 1 is installed in the blast furnace. In addition, the length of the part of the first protective tube 30 protruding from the casting bulging portion 12 only needs to be equal to or shorter than the distance A. The length dimension L1 to the end face may be set to the distance A or more.
For example, when the total length of the protective tube 8 formed by the first protective tube 30 and the second protective tube 40 is about 200 to 300 mm, the first protective tube 30 has a length dimension that is half or less of the total length. There may be. Further, the length dimension L1 of the first protective tube 30 is set to a length dimension of 100 mm or more so that it can be installed in an upper mold 51 described later.

The second protective tube 40 is formed by a pipe having a circular arc cross section.
The end 41 of each second protective tube 40 is connected to the end 32 of the first protective tube 30 by welding, and extends along the longitudinal direction of the first protective tube 30.

  Since the outer diameter of the second protective tube 40 is the same as described above, the description thereof is omitted here. The inner diameter dimension of the second protective tube 40 is larger than the outer diameter dimension of the extraction tube portions 22 and 23. Therefore, a clearance is formed between the inner peripheral surface of the second protective tube 40 and the outer peripheral surfaces of the extraction tube portions 22 and 23. In the present embodiment, the thickness of the second protective tube 40 is the same as the thickness of the first protective tube 30. The clearance between the inner peripheral surface of the first protective tube 30 and the outer peripheral surface of the take-out pipe portions 22 and 23 is the clearance between the inner peripheral surface of the second protective tube 40 and the outer peripheral surface of the take-out pipe portions 22 and 23. Even bigger than that.

  The length dimension L2 (see FIG. 4A) from one end surface to the other end surface of the second protective tube 40 is combined with the length dimension L1 of the first protective tube 30 to protect the extraction tube portions 22 and 23. The length dimension is such that it is a necessary length dimension required for this. In the present embodiment, the length dimension L <b> 2 of the second protective tube 40 is longer than that of the first protective tube 30.

[Manufacturing method of this embodiment]
Hereinafter, the manufacturing method of the copper stave cooler 1 which concerns on this embodiment is demonstrated.
The copper stave cooler 1 is manufactured along the steps shown in FIG.
In FIG. 5, step S1 is a manufacturing process of the cooling pipe 20, step S2 is an arrangement process of the cooling pipe 20, step S3 is a casting process, and step S4 is an extension process of the second protective pipe 40. It is.

  First, in the manufacturing process (step S1) of the cooling pipe 20, the pipe is bent into a predetermined shape, and a plurality of cooling pipes 20 having the cooling pipe part 21 and the extraction pipe parts 22 and 23 are manufactured.

Next, in the arrangement step (step S2) of the cooling pipe 20, as shown in FIG. 6 (A), the upper mold 51 and the lower mold 52 of the sand mold 5 are prepared. A hole is formed in the upper mold 51, and the first protective tube 30 is installed in the hole. The end 31 of the first protective tube 30 is disposed so as to protrude from the inner surface of the upper mold 51.
Subsequently, the extraction pipe portions 22 and 23 of the cooling pipe 20 are inserted from the end portions 31 of the respective first protective tubes 30, and the jig 6 is attached to the portions of the extraction pipe portions 22 and 23 protruding from the end portions 32. To do. As a result, the cooling pipe 20 is placed on the end portion 32 of the first protective pipe 30.
In this state, the upper mold 51 and the lower mold 52 are combined to form a space into which the molten copper or copper alloy is poured into the sand mold 5. At this time, the cooling pipe portion 21 of the cooling pipe 20 is disposed in the space.

Next, in the casting step (step S3), a molten metal of copper or a copper alloy is poured into the sand mold 5 to cast the cooling pipe part 21 and the end part 31 of the first protective pipe 30.
Here, since the molten metal surface 7 (see FIG. 6B) gradually rises from the lower side in the sand mold 5, the cooling pipe 20 is heated first from the lower side. For this reason, the thermal expansion of the lower part of the cooling pipe part 21 is larger than that of the upper part, and as shown in FIG. 6B, the cooling pipe part 21 is curvedly deformed in a concave shape upward and taken out. It tilts so that the front-end | tip of the pipe parts 22 and 23 may mutually approach.
At this time, the extraction pipe portions 22 and 23 approach the inner peripheral surface of each first protective tube 30, but the clearance between the inner peripheral surface of each first protective tube 30 and the outer peripheral surface of the extraction pipe portions 22 and 23 is the same as that described above. Since it is formed large as described above, the restraint of tilting due to the contact of the extraction pipe portions 22 and 23 with the first protective pipe 30 is weakened, and the generation of thermal stress in the cooling pipe 20 based on the contact is suppressed, It is possible to prevent the cooling pipe 20 from being damaged during casting and leading to defective production.
As the temperature of the molten metal decreases, the thermal expansion deformation of the cooling pipe 20 gradually returns to its original shape (the shape shown in FIG. 6A). After the molten metal is further cooled and the copper or copper alloy is solidified, the sand mold 5 is removed.

Next, in the extending process (step S4), after the casting process described above, the second protective pipes 40 are welded to the end portions 32 of the first protective pipes 30 to be extended to the first protective pipes 30. To do. The other end 42 of each second protective tube 40 is connected to the outer peripheral surfaces of the extraction tube portions 22 and 23 by fillet welding.
By combining the first protective tube 30 and the second protective tube 40 in this manner, a length dimension necessary for protecting the take-out pipe portions 22 and 23 is ensured.
In the state where the copper stave cooler 1 is installed in the blast furnace, the second protective tube 40 is sealed and welded to the iron skin 4.

[Effect of this embodiment]
(1) In this embodiment, the copper stave cooler 1 includes a copper stave body 10, a cooling pipe 20 that forms the cooling water passage 3 inside the stave body 10, and a protective pipe 8 that protects the cooling pipe. The cooling pipe 20 includes a cooling pipe portion 21 disposed inside the stave main body 10, and take-out pipe portions 22 and 23 that protrude from the stave main body 10 continuously to the cooling pipe portion 21. A copper stave cooler 1 in which a protective tube 8 is disposed on the outer peripheral side of the portions 22 and 23, and the protective tube 8 is connected to the first protective tube 30 connected to the stave body 10 and the first protective tube 30. And the second protective tube 40.
Since it has the said structure, the copper stave cooler 1 can be manufactured with the manufacturing method mentioned above. When casting the cooling pipe 20, the molten metal surface 7 gradually rises from below in the sand mold 5, so the cooling pipe portion 21 is heated first from the bottom, and the lower portion is compared to the other portions. As a result, the pipes 22 and 23 that are continuously expanded to the cooling pipe 21 are tilted.
Here, since the protective pipe 8 that protects the cooling pipe 20 is divided into the first protective pipe 30 and the second protective pipe 40, the second protective pipe 40 is not connected to the first protective pipe 30. Thus, the cooling pipe 20 can be cast.
Since the length of the first protective tube 30 is shorter than the required length of the entire protective tube 8 required to protect the extraction tube portions 22 and 23, the first protective tube 30 is extracted by thermal expansion deformation of the cooling pipe 20. An area in which the pipe portions 22 and 23 can tilt can be expanded. Accordingly, it is possible to reduce the restraint of the tilting of the take-out pipe portions 22 and 23 due to the contact of the take-out pipe portions 22 and 23 with the first protective tube 30 and to suppress the generation of thermal stress in the cooling pipe 20 based on the contact.
Further, by connecting the second protective tube 40 to the first protective tube 30 after casting, the required length dimension required to protect the take-out tube portions 22 and 23 can be secured.
Furthermore, in the present embodiment, the following effects can be exhibited.

(2) The outer diameter of the first protective tube 30 is set larger than the outer diameter of the second protective tube 40, and the inner diameter of the first protective tube 30 is set smaller than the outer diameter of the second protective tube 40. . For this reason, since the step part 33 is formed in the butt | matching part of the other edge part 32 of the 1st protection tube 30 and the 2nd protection tube 40, the length direction of the 1st protection tube 30 and the 2nd protection tube 40 Fillet can be welded from the side. Therefore, for example, the distance in the left-right direction shown in FIG. 2 between the plurality of cooling pipes 20 is such that the first protective pipe 30 and the second protective pipe 40 cannot be fixed by welding or the like from the direction orthogonal to the length direction. Even if it is a case where it arranges narrowly, the 1st protection tube 30 and the 2nd protection tube 40 can be connected easily.
(3) Also, as shown in FIG. 4B, when the outer diameter and the inner diameter of the first protective tube 30 are set larger than the outer diameter of the second protective tube 40, the second protective tube 40 is The first protective tube 30 can be inserted and connected. For this reason, for example, when a bending stress is applied to the first protective tube 30 and the second protective tube 40 due to thermal deformation of the copper stave cooler 1 used in the blast furnace, cracks or the like occur in the connection portion. Even if it exists, when the insertion part of the 2nd protection tube 40 contacts the inner surface of the 1st protection tube 30, it can prevent that the 1st protection tube 30 and the 2nd protection tube 40 contact | win the extraction pipe parts 22 and 23. FIG. For this reason, it can prevent that the 1st protective tube 30 and the 2nd protective tube 40 hit | strike the extraction pipe parts 22 and 23. FIG. For this reason, excessive bending stress does not generate | occur | produce in the cooling pipe 20 when the extraction pipe parts 22 and 23 contact the 1st protective pipe 30 and the 2nd protective pipe 40, and the generation | occurrence | production of the fatigue crack of the cooling pipe 20 occurs. Can be suppressed.
Also, fillet welding can be performed from the length direction side of the first protective tube 30 and the second protective tube 40.
Further, since the inner diameter of the first protective tube 30 is formed larger than the outer diameter of the second protective tube 40, the clearance between the cooling pipe 20 and the first protective pipe 30 can be formed larger. For this reason, for example, compared with the case where the first protective tube 30 and the second protective tube 40 have the same diameter, the tiltable regions of the extraction pipe portions 22 and 23 due to the thermal expansion deformation of the cooling pipe 20 at the time of casting are reduced. Largely secured.

(4) The first protective tube 30 has a length L1 that fits in the furnace when the stave body 10 is installed in the blast furnace, and the outer diameter of the first protective tube 30 is the take-out portion of the cooling pipe 20 and The opening diameter of the iron skin 4 through which the second protective tube 40 is inserted is made larger. For this reason, the first protective tube is located in the furnace with the copper stave cooler 1 installed in the blast furnace. Therefore, when the copper stave cooler 1 tends to be deformed excessively due to the temperature change in the furnace, the end 32 of the first protective tube 30 hits the furnace inner surface of the iron shell 4, so that the copper stave cooler 1 is excessively large. Deformation can be suppressed.

[Modification]
The present invention is not limited to the configuration described in the above embodiment, and modifications within a range in which the object of the present invention can be achieved are included in the present invention.
For example, in the embodiment described above, the outer diameter of the first protective tube 30 is larger than the outer diameter of the second protective tube 40, but is not limited thereto. For example, as another embodiment of the present invention, as shown in FIG. 7, the outer diameter and the inner diameter of the first protective tube 30 may be the same as the outer diameter and the inner diameter of the second protective tube 40. In the case of having the same diameter in this way, the first protective tube 30 and the second protective tube 30 are cut by cutting one protective tube having a necessary length dimension required to protect the cooling pipe 20. The tube 40 can be easily manufactured.
Further, after the cooling pipe 20 is cast, the end 41 of the second protective tube 40 can be easily connected to the end 32 of the first protective tube 30 by butt welding.

  Even if the first protective tube 30 and the second protective tube 40 have the same diameter as described above, the tilting regions of the extraction tube portions 22 and 23 can be expanded. Specifically, a molten copper or copper alloy is injected into the sand mold 5, and the cooling pipe 20 is subjected to thermal expansion deformation from the state shown in FIG. 8A to the state shown in FIG. Since the length dimension L1 of the protective tube 30 is shorter than the required length dimension required to protect the extraction pipe portions 22 and 23, the tilting area of the extraction pipe portions 22 and 23 can be expanded. . Therefore, generation | occurrence | production of the thermal stress of the piping 20 for cooling based on the contact to the 1st protective tube 30 of the extraction pipe parts 22 and 23 can be suppressed.

  In addition, if a sufficient clearance is secured between the first protective tube 30 and the extraction pipe portions 22 and 23 to suppress the generation of thermal stress in the cooling pipe 20, the inner diameter of the second protective tube 40. May be formed larger than the outer diameter of the first protective tube 30.

In the said embodiment, although said 1st protective tube 30 is made into the length dimension which fits in a furnace when installing the stave main body 10 in a blast furnace, it may not be restricted to this but a longer dimension.
Each cooling pipe 20 is formed in a substantially U-shape, but is not limited thereto. Depending on the opening position of the iron skin 4 or the like, bending can be appropriately made in the plane of the stave body 10.

  In addition, the number, arrangement | positioning, each shape, and each material of the copper stave cooler 1 which concern on the said embodiment can be suitably set within the range of the summary of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Copper stave cooler, 10 ... Stave body, 11 ... Protruding part, 12 ... Casting bulging part, 13 ... Fixing bulging part, 2 ... Fixing bolt, 3 ... Cooling water channel, 4 ... Iron skin, 5 ... Sand mold, 51 ... Upper die, 52 ... Lower die, 6 ... Jig, 7 ... Hot water surface, 8 ... Protective pipe, 20 ... Cooling pipe, 21 ... Cooling pipe part, 22, 23 ... Extraction pipe part, 30 ... First protection Tube, 31, 32, 41, 42 ... end, 33 ... step, 40 ... second protective tube, A ... distance, L1, L2 ... length, S1-S4 ... step.

Claims (5)

A copper stave body, a cooling pipe that forms a cooling water channel inside the stave body, and a protective pipe that protects the cooling pipe, and the cooling pipe is disposed inside the stave body. It is a copper stave cooler having a cooling pipe part and an extraction pipe part protruding from the stave body continuously to the cooling pipe part, and the protective pipe is arranged on the outer peripheral side of the extraction pipe part,
The protective tube includes a first protective tube connected to the stave body and a second protective tube that can extend to an end of the first protective tube along the longitudinal direction of the first protective tube. This is a copper stave cooler. In the copper stave cooler according to claim 1,
The outer diameter of the first protective tube is set larger than the outer diameter of the second protective tube,
The copper stave cooler characterized in that the inner diameter of the first protective tube is set smaller than the outer diameter of the second protective tube. In the copper stave cooler according to claim 1,
The copper stave cooler, wherein an outer diameter and an inner diameter of the first protective tube are set larger than an outer diameter of the second protective tube. In the copper stave cooler according to claim 2 or claim 3,
The first protective tube has a length dimension that fits in the furnace when the stave body is installed in a blast furnace, and the outer diameter of the first protective tube is the take-out part of the cooling pipe and the second protective tube Copper stave cooler characterized in that it is made larger than the opening diameter of the blast furnace core through which the pipe is inserted. A manufacturing method for manufacturing the copper stave cooler according to any one of claims 1 to 4,
Install the first protective tube on the sand mold,
The cooling pipe is inserted into the first protective pipe and the cooling pipe is disposed in the sand mold,
Injecting a molten metal of copper or copper alloy for forming the stave body into the sand mold, and casting and connecting one end of the cooling pipe part of the cooling pipe and the first protective pipe,
After casting, the second protective tube is connected to the other end of the first protective tube.

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