JP2024160578A - Blast furnace cooling structure - Google Patents

Abstract

To provide a cooling structure for a blast furnace capable of achieving both protection of a furnace body iron skin and long life of a refractory in the blast furnace, and a blast furnace equipped with the same.SOLUTION: A cooling structure 30 for a blast furnace includes a plurality of cooling bodies 7 arranged inside the furnace of a furnace body iron skin 3 so as to be connected in the circumferential direction of a blast furnace 20, and a refractory 9 arranged in contact with or close to the cooling bodies 7. The cooling body 7 has a first cooling body 7a extending horizontally in the circumferential direction of the blast furnace 20, and at least one second cooling body 7b extending upward or downward from the first cooling body 7a and having a circumferential length of the blast furnace 20 shorter than that of the first cooling body 7a. The length of the second cooling body 7b in the circumferential direction of the blast furnace 20 is shorter than the length of the first cooling body 7a in the circumferential direction of the blast furnace 20. The refractory 9 is disposed above or below the first cooling body 7a and between two second cooling bodies 7b adjacent in the circumferential direction of the blast furnace 20.SELECTED DRAWING: Figure 4

Description

This disclosure relates to a cooling structure for a blast furnace.

The cooling plate method and the stave method are commonly known as methods for protecting the blast furnace shell from the heat of the contents inside the blast furnace. With the cooling plate method, a wall is made of refractory material installed along the inner circumference of the furnace shell, and this is cooled by a cooling plate, preventing direct contact between the high-temperature gas and other contents inside the blast furnace and the furnace shell, protecting the furnace shell. With the stave method, a wall is made of copper or cast iron plate members with water channels inside, and this is installed along the inner circumference of the furnace shell to protect the furnace shell. Also, when using staves in high-temperature areas such as the morning glory, it is common to use staves together with refractory material, as with cooling plates.

In both methods, the refractory constitutes part of the furnace body shape, and if the refractory wears over time in the high-temperature environment inside a blast furnace, the furnace body shape changes over time, and the production performance originally intended at the time of design may no longer be achieved. In relation to this, while the stave method cools the stave itself, the cooling plate method cools the refractory, which is prone to wear in high-temperature environments, making it possible to improve the lifespan of refractory.

Generally, either the cooling plates or staves described above are used in the high-temperature areas of a blast furnace, but it is also known in the art that both cooling plates and staves are combined and arranged vertically to protect the furnace shell.

For example, Patent Document 1 teaches a blast furnace cooling plate with a wide and thick shape that blocks back drafts to the back side of a stave cooler, and discloses an embodiment in which a stave cooler is placed on the steel shell of a blast furnace in combination with the above-mentioned blast furnace cooling plate, which is arranged in a staggered pattern on the underside of the stave cooler to cool the refractories inside the furnace. Patent Document 1 also describes that by making the cooling plate wide and thick, it is possible to prevent back drafts to the back side of the stave cooler by the cooling plate, thereby preventing wear on the stave cooler and deformation of the steel shell.

Patent Document 2 also teaches a blast furnace body cooler whose tip portion to be inserted into the blast furnace body is bent to the right or left in a horizontal plane, giving it an L-shaped horizontal cross section, and discloses an embodiment of a blast furnace body cooling device in which the blast furnace body cooler is installed on the blast furnace body shell at the boundary between the lower end of a stave cooler and the tuyere of the blast furnace body.

The cooling plates used in the blast furnace may be damaged or mechanically worn out due to high temperatures during blast furnace operation. If the cooling plate is damaged, the cooling plates described in Patent Documents 1 and 2 will no longer be able to fulfill their essential role of protecting the furnace body skin. Since protection of the furnace body skin is essential for blast furnace operation, if the cooling plate is damaged, it is generally necessary to stop the blast furnace operation, remove the damaged cooling plate from the outside of the blast furnace, and replace it with a new cooling plate. Therefore, a large opening for replacing the cooling plate is required on the furnace body skin. On the other hand, the furnace body skin is located on the outermost surface of the blast furnace, and is an important element that constitutes the furnace body shape and ensures the mechanical strength of the blast furnace. Therefore, it is necessary to design the arrangement of the cooling plate so that the strength of the blast furnace is not reduced by providing the above-mentioned opening for replacing the cooling plate on the furnace body skin. For example, as one method of arranging the cooling plate while ensuring the strength of the blast furnace, a method is known in which the cooling plate is arranged in a staggered pattern (i.e., two or more stages) on the furnace body skin of the blast furnace. Therefore, in blast furnaces that use cooling plates to protect the furnace shell, it is generally necessary to arrange the cooling plates so as to improve the cooling efficiency of the refractory while maintaining the strength of the blast furnace. Therefore, the arrangement of the cooling plates is determined taking into consideration the effect of the arrangement of the replacement openings on the strength of the blast furnace, and is therefore not necessarily optimized for cooling the refractory, resulting in insufficient cooling of the refractory, and therefore leaving room for improvement in extending the life of the refractory.

For this reason, Patent Document 3 describes that in order to simultaneously protect the furnace body skin and extend the life of the refractory material in the blast furnace while maintaining the strength of the furnace body skin sufficiently, it is effective to use a blast furnace cooling structure that includes a stave arranged on the furnace body skin's inner side and a cooler arranged on the furnace side of the stave. With such an arrangement, the role of protecting the furnace body skin is played by the stave, so it is possible to specialize the role of the cooler to cooling intended to extend the life of the refractory material arranged around it. In this case, even if the cooler is damaged during blast furnace operation, the stave protects the furnace body skin, so replacement of the cooler is not essential, and therefore there is no need to provide a large opening on the furnace body skin for replacement of the cooler. Therefore, there is no need to arrange the coolers in a staggered manner or in a state where they are spaced apart from each other, for example, in two or more stages, in order to ensure the strength of the furnace body skin. This allows multiple cooling bodies to be arranged in succession on a substantially horizontal plane, enabling the cooling bodies to cool the refractory material in the blast furnace efficiently and uniformly. This extends the life of the refractory material and enables stable long-term blast furnace operation.

Japanese Patent Application Publication No. 08-199211 JP 2005-248209 A Patent No. 7147463

However, in the technology described in Patent Document 3, if the refractory is located away from the cooling body due to the positional relationship between the cooling body and the refractory, the refractory may not be sufficiently cooled. In this case, the refractory is damaged over time, and the profile of the inside of the blast furnace becomes uneven. When the profile of the inside of the blast furnace becomes uneven, the descent behavior of the charge inside the blast furnace becomes unstable, which causes problems in maintaining stable operation of the blast furnace.

In view of the above problems, the present disclosure aims to provide a cooling structure for a blast furnace that can achieve both protection of the furnace shell and an extended service life for the refractories inside the blast furnace.

This disclosure is based on the above findings, and its gist is as follows:

(1) A plurality of cooling bodies arranged in a row in the circumferential direction of the blast furnace on the inner side of the furnace body shell;
A refractory material disposed in contact with or in close proximity to the cooling body;
Equipped with
The cooling body has a first cooling body extending horizontally in a circumferential direction of the blast furnace and at least one second cooling body extending upward or downward from the first cooling body,
The length of the second cooling body in the circumferential direction of the blast furnace is shorter than the length of the first cooling body in the circumferential direction of the blast furnace,
The refractory material is arranged above or below the first cooling body and between two second cooling bodies adjacent to each other in the circumferential direction of the blast furnace.
Cooling structure for blast furnace.

(2) The cooling structure for a blast furnace described in (1) above, in which the cooling body has two or more of the second cooling bodies, and the two or more second cooling bodies are arranged adjacent to each other in the circumferential direction of the blast furnace.

(3) Further comprising a stave arranged on the inner side of the furnace body iron shell,
The cooling structure for a blast furnace according to the above (1) or (2), wherein the cooling body is arranged further inside the furnace than the stave.

(4) The inner wall of the stave facing the cooling body on the inside of the furnace is a tapered surface whose inner diameter decreases from bottom to top,
The cooling structure for a blast furnace according to (3) above, wherein the opposing surface of the second cooling body facing the inner wall of the stave is a surface along the tapered surface of the stave and is in contact with or close to the tapered surface.

(5) A cooling structure for a blast furnace as described in (4) above, in which the cooling body is fixed to the furnace body shell by bolts at at least two points spaced apart in the vertical direction.

This disclosure provides a cooling structure for a blast furnace that can achieve both protection of the furnace shell and an extended service life for the refractories inside the blast furnace.

1 is a schematic diagram showing a blast furnace to which a blast furnace cooling structure according to an embodiment of the present disclosure is applied, and a configuration of the periphery thereof. FIG. 1 is a diagram showing a blast furnace cooling structure according to one embodiment of the present disclosure and its surroundings, and is a schematic cross-sectional view of a blast furnace equipped with a blast furnace cooling structure cut in the vertical direction. 3 is a schematic cross-sectional view taken along dashed line I-I' in FIG. 2. FIG. 4 is a view of the cooling body as seen from the direction of arrow A1 in FIG. 3 . FIG. 2 is a diagram showing how the profile of the inside of a blast furnace becomes uneven when refractory material is cooled by a cooling body without a second cooling body. 1 is a diagram showing the extent to which a refractory material has disappeared over time when the refractory material is cooled by a cooling body according to the present embodiment; FIG. A cross-sectional view showing how a load is placed on the water supply and drainage piping of a cooling body that does not have a second cooling body, as a result of the refractory expanding upward. FIG. 13 is a diagram showing a specific example of suppressing the effect of refractory expansion by utilizing the taper of the morning glory portion Z1. FIG. 13 is a diagram showing a specific example of suppressing the effect of refractory expansion by utilizing the taper of the morning glory portion Z1. 1A to 1C are schematic diagrams showing variations in the configuration of a cooling body. 1A to 1C are schematic diagrams showing variations in the configuration of a cooling body. 1A to 1C are schematic diagrams showing variations in the configuration of a cooling body. 1A to 1C are schematic diagrams showing variations in the configuration of a cooling body. 1A to 1C are schematic diagrams showing variations in the configuration of a cooling body.

Hereinafter, some embodiments according to the present disclosure will be described with reference to the drawings. However, these descriptions are intended to merely exemplify preferred embodiments of the present disclosure, and are not intended to limit the present disclosure to such specific embodiments. The description will be given in the following order.
1. Example of schematic configuration of blast furnace and surrounding area 2. Cooling structure for blast furnace 2.1. Cooling body 2.2. Staves 2.3. Cooling effect of cooling body 2.4. Suppression of breakage of cooling pipes 2.5. Variations in cooling body configuration 3. Blast furnace 3.1. Furnace body steel shell 3.2. Refractory material

[1. Example of the schematic configuration of a blast furnace and its surroundings]
1 is a schematic diagram showing a blast furnace 20 to which a blast furnace cooling structure according to an embodiment of the present disclosure is applied, and the configuration of the periphery thereof. Blast furnace raw materials such as ore raw materials and coke are transported to the furnace top by a charging conveyor 22 and charged into the blast furnace 20 via a furnace top charging device 24. The blast furnace raw materials include general ore raw materials and coke, as well as auxiliary raw materials, so-called non-calcined carbon-containing agglomerated ore and ferro coke. General ore raw materials include, for example, sintered ore, lump ore, and pellets.

The top charging device 24 charges ore raw materials, coke, and other materials into the blast furnace 20 so as to replenish the lowered materials and maintain the height position of the top surface of the materials inside the blast furnace 20 at a specified position. At this time, the ore raw materials and coke are charged so as to form alternating layers inside the blast furnace 20, and descend inside the furnace while maintaining this layered state. Air (hot air) and pulverized coal (PC), a complementary reducing agent for coke, are blown in from the tuyere 11 at the bottom 10 of the blast furnace 20. The pulverized coal and coke are combusted by this hot air, generating high-temperature gases (reducing gases) such as carbon monoxide and hydrogen.

The reducing gas rises inside the furnace as an updraft, raising the temperature of the iron ore that descends inside the furnace while stripping it of oxygen. The softened and molten iron oxide drips through the coke layer and comes into contact with the carbon in the coke, where it is further reduced to molten iron, which accumulates in a pit at the bottom of the furnace. This molten iron is removed from a tap hole 26 located next to the bottom of the furnace and transported to the next steelmaking process.

[2. Cooling structure for blast furnace]
FIG. 2 is a diagram showing a blast furnace cooling structure 30 according to an embodiment of the present disclosure and its surroundings, and is a schematic cross-sectional view of a blast furnace 20 equipped with the blast furnace cooling structure 30 cut in the vertical direction. The blast furnace cooling structure 30 according to the present disclosure includes at least one cooling body 7 arranged on the furnace inner side of the furnace body shell 3 and a refractory material 9 arranged in contact with or adjacent to the cooling body 7. It is equipped with the following:

The blast furnace cooling structure 30 according to the present disclosure can be placed and used in any area within the blast furnace 20, but is preferably placed in an area that is hotter within the blast furnace 20, such as the morning glory portion Z1 or the belly portion Z2 shown in FIG. 1, and is more preferably placed in the morning glory portion Z1 as in the embodiment shown in FIG. 2. The morning glory portion Z1 of the blast furnace 20 is one of the areas that is hottest within the blast furnace and is more susceptible to wear of the refractory 9. Therefore, by using the blast furnace cooling structure 30 according to the present disclosure in the morning glory portion Z1, the life of the refractory 9 placed around the cooling body 7 can be extended.

The blast furnace cooling structure 30 further includes a stave 5 arranged on the furnace inner side of the furnace body shell 3, and the cooler 7 is arranged further inside the furnace than the stave 5. By arranging the cooler 7 further inside the furnace than the stave 5 arranged on the furnace inner side of the furnace body shell 3, the furnace body shell 3 can be protected by the stave 5, and the role of the cooler 7 can be devoted to cooling the refractory material 9.

The blast furnace cooling structure 30 according to the present disclosure is installed in the morning glory portion Z1 (see FIG. 1) of the blast furnace 20, but such an arrangement is merely one example of an embodiment of the present disclosure, and as described above, the blast furnace cooling structure 30 according to the present disclosure can be installed at any location in the blast furnace 20. Referring to FIG. 2, the blast furnace 20 has a furnace body shell 3 on its outermost surface, and the furnace body shell 3 forms a main part of the furnace body shape of the blast furnace 20. That is, the furnace body shape of the blast furnace 20 is mainly composed of the furnace body shell 3. The lower part 10 of the blast furnace 20 is provided with a tuyere 11 and a tuyere brick (refractory 9a) that protects the tuyere 11 from the high-temperature contents in the blast furnace 20. Staves 5 for protecting the furnace body shell 3 are arranged on the inner side of the furnace body shell 3 (left side of FIG. 2). In the morning glory section Z1, multiple cooling bodies 7 are arranged on the furnace inner side of the stave 5, i.e., on the opposite side to the furnace body shell 3 side. In addition, refractory material 9 is arranged around the cooling bodies 7 in contact with the cooling bodies 7. With this arrangement, the role of protecting the furnace body shell 3 is fulfilled by the stave 5, so that the role of the cooling bodies 7 can be devoted to cooling the refractory material 9 arranged adjacent to the periphery.

(2.1. Cooling Body)
Fig. 3 is a cross-sectional view taken along dashed line II' in Fig. 2. Fig. 4 is a view of the cooling body 7 as viewed from the direction of arrow A1 in Fig. 3. More specifically, Fig. 4 shows a development view of each cooling body 7 as viewed from the center of the blast furnace 20. For ease of explanation, the refractories 9 between adjacent cooling bodies 7 are omitted in Fig. 3. The furnace body shell 3 and the staves 5 are omitted in Fig. 4.

The blast furnace 20 is equipped with multiple cooling bodies 7 on the inside of the stave 5. Figure 3 shows three cooling bodies 7 arranged along the inner wall of the stave 5. Multiple cooling bodies 7 are arranged along the inner wall of the stave 5 outside the range shown in Figure 3. Therefore, the multiple cooling bodies 7 are arranged in a line along the entire circumference of the inner wall of the stave 5 in the circumferential direction of the blast furnace 20 (the direction shown by arrow A2 in Figures 3 and 4).

The cooling body 7 has a refrigerant flow path 15 for flowing a refrigerant (e.g., water) therein, which is shown by a dashed line in Fig. 2 and Fig. 3. The refrigerant flow path 15 inside the cooling body 7 can select any path, and the paths shown in Fig. 2 and Fig. 3 are shown as examples. The inlet and outlet of the refrigerant flow path 15 inside the cooling body 7 are provided with piping connections 19 for connecting piping 17 for water supply and drainage of the refrigerant, respectively. The cooling body 7 is connected to the piping 17 at the piping connection 19, and the piping 17 penetrates the stave opening 23 of the stave 5 and the iron shell opening 21 of the furnace body iron shell 3, and is connected to an external refrigerant source (not shown). Thus, the refrigerant is supplied at a predetermined amount from the refrigerant source, passes through the water supply piping 17, flows into the refrigerant flow path 15 inside the cooling body 7, and returns to the drainage piping 17. In this way, typically, two pipings 17 for water supply and drainage of the refrigerant are connected to one cooling body 7. The coolant flowing through the coolant flow passage 15 can be any coolant known in the art, but is preferably water.

Each of the multiple cooling bodies 7 has a first cooling body (horizontal cooling body) 7a that extends horizontally in the circumferential direction of the blast furnace 20 on the furnace inner side of the stave 5, and at least one second cooling body (vertical cooling body) 7b that extends upward or downward from the first cooling body 7a. The length of the second cooling body 7b in the circumferential direction of the blast furnace 20 is shorter than the length of the first cooling body 7a in the circumferential direction of the blast furnace 20. The cooling body 7 has two or more second cooling bodies 7b, and two or more second cooling bodies 7b may be arranged adjacent to each other in the circumferential direction of the blast furnace. For example, each cooling body 7 is provided corresponding to each of the positions of the multiple tuyere 11 arranged in the circumferential direction. In the example shown in Figures 3 and 4, of the three cooling bodies 7 shown in the figures, the central cooling body 7 has one first cooling body 7a and two second cooling bodies 7b. In addition, the cooling bodies 7 arranged on the left and right have one first cooling body 7a and one second cooling body 7b. In the example shown in Figures 2 to 4, the second cooling body 7b extends upward from the first cooling body 7a. As will be described later, the second cooling body 7b may also extend downward from the first cooling body 7a.

As shown in FIG. 4, the circumferential length L2 of the second cooling body 7b is shorter than the circumferential length L1 of the first cooling body 7a. With this configuration, when multiple cooling bodies 7 are arranged in the circumferential direction, a space is formed between two adjacent second cooling bodies 7b in the circumferential direction. The refractory material 9 is arranged in contact with or close to the cooling body, and is arranged so as to be continuous along the entire circumference of the inner wall of the stave 5 like the cooling body 7. At the height position where the cooling body 7 is arranged, it is arranged above or below the first cooling body 7a and between two adjacent second cooling bodies 7b. Therefore, the space between the two adjacent second cooling bodies 7b is the area where the refractory material 9 is arranged. The circumferential length may be the length when each cooling body 7 is developed on a plane as seen from the center of the blast furnace 20, as shown in FIG. 4. The circumferential length may also be the length of an arc at the position of the inner side surface 7a4 of the first cooling body 7a shown in FIG. 2.

3 and 4, the cooling bodies 7 having one second cooling body 7b and the cooling bodies 7 having two second cooling bodies 7b are alternately arranged along the inner wall of the stave 5, but multiple cooling bodies 7 having one second cooling body 7b may be arranged along the inner wall of the stave 5, or multiple cooling bodies 7 having two second cooling bodies 7b may be arranged along the inner wall of the stave 5. These arrangements are appropriately selected depending on the positions of the stave opening 23 and the iron shell opening 21. In particular, when repairing an existing blast furnace 20, the positions of the stave opening 23 and the iron shell opening 21 may be determined in advance, so the configuration of the cooling body 7 (the number of second cooling bodies 7b that one cooling body 7 has) and the arrangement are appropriately determined to match these.

The refrigerant flow path 15 is provided so as to pass through both the first cooling body 7a and the second cooling body 7b. This allows both the first cooling body 7a and the second cooling body 7b to be cooled by the refrigerant. In the example shown in Figures 2 and 3, two pipes 17 for supplying and draining the refrigerant are connected to the second cooling body 7b. Therefore, the refrigerant supplied from the refrigerant source passes through the water supply pipe 17, flows from the refrigerant flow path 15 inside the second cooling body 7b to the refrigerant flow path 15 inside the first cooling body 7a, flows from the refrigerant flow path 15 inside the first cooling body 7a to the refrigerant flow path 15 inside the second cooling body 7b, and returns to the drain pipe 17.

The first cooling body 7a and the second cooling body 7b may be manufactured as a single unit, or the first cooling body 7a and the second cooling body 7b may be manufactured separately and then joined together. For example, if the first cooling body 7a and the second cooling body 7b are made of castings, they can be cast as a single unit. If the first cooling body 7a and the second cooling body 7b are manufactured separately and then joined together, the second cooling body 7b is joined to the top surface 7a2 or bottom surface 7a3 of the first cooling body 7a.

In addition, when the first cooling body 7a and the second cooling body 7b are manufactured separately and then joined together, for example, during construction, the first cooling body 7a may be assembled to the blast furnace 20 and then the second cooling body 7b may be assembled to the first cooling body 7a, or the first cooling body 7a and the second cooling body 7b may be assembled to the blast furnace 20. In this case, the refrigerant flow paths 15 of the first cooling body 7a and the second cooling body 7b may be separate systems.

As mentioned above, if the profile of the inside of the blast furnace becomes uneven, the descent behavior of the charge in the blast furnace becomes unstable, which is a problem in maintaining stable operation of the blast furnace. As an ideal profile of the working surface in the furnace of the morning glory section Z1, it is important to stably maintain the angle θ1 of the inner surface of the blast furnace 20 with respect to the horizontal direction in the range of 70° to 80° starting from point P (tip of the tuyere cooling box) in Figure 2 for a long period of time. For this reason, the angle θ1 of the inner surface of the blast furnace 20 of the second cooling body 7b with respect to the horizontal direction starting from point P is set to a range of 70° to 80°. In this way, it is preferable to previously set the angle of the surface of the second cooling body 7b on the inside of the blast furnace 20 to the range of 70° to 80°, which is ideal for stable operation of the blast furnace 20.

The cooling body 7 is not particularly limited, but is preferably made of copper or a copper alloy from the viewpoints of workability, thermal conductivity, cost, etc. The melting point of copper is about 1100°C, and flowing a refrigerant through the refrigerant flow path 15 prevents the cooling body 7 from melting during operation of the blast furnace 20. Therefore, the angle θ1 of the surface of the second cooling body 7b on the inside of the blast furnace 20 is maintained in the range of 70° to 80° for a long period of time (e.g., about 20 to 30 years).

The cooling body 7 is arranged in the blast furnace 20 on the furnace inner side of the stave 5, i.e., on the opposite side to the furnace body shell 3 side. One cooling body 7 may be arranged on the furnace inner side of the stave 5, or two or more cooling bodies 7 may be arranged. Also, a part of the cooling body 7 may be arranged on the furnace inner side of a certain stave 5 (i.e., one cooling body 7 may be arranged across two adjacent staves 5). With such an arrangement, the cooling body 7 is arranged so as not to come into direct contact with the furnace body shell 3, so that the function of protecting the furnace body shell 3 is left to the stave 5, and the cooling body 7 can cool the refractory material 9, such as bricks, arranged around it. Typically, the cooling body 7 can be for cooling the refractory material 9.

The first cooling body 7a and the second cooling body 7b in the present disclosure may have any shape, but generally may be plate-shaped. In an embodiment in which the first cooling body 7a is plate-shaped, it is preferable that the outer side surface 7a1 of the first cooling body 7a is arranged on the furnace inner side of the stave 5, that is, the side surface 7a1 of the first cooling body 7a faces the furnace inner surface of the stave 5. In an embodiment in which the side surface 7a1 of the first cooling body 7a is arranged on the furnace inner side of the stave 5, it is more preferable that the upper surface 7a2 and the bottom surface 7a3 of the first cooling body 7a are arranged so as to be approximately horizontal. By arranging in this manner, it is possible to arrange the surface having the maximum area of the first cooling body 7a so as to contact the surrounding refractory material 9. Therefore, it is possible to more efficiently cool the refractory material 9, and further to achieve a long life of the refractory material 9. In addition, in order to attach the cooling body 7 to the stave 5, a member such as an attachment flange (not shown) may be provided between the stave 5 and the cooling body 7.

In this specification, when the first cooling body 7a is plate-shaped, the "top surface 7a2" of the cooling body 7 refers to the surface of the first cooling body 7a that has the largest area. The "bottom surface 7a3" refers to the surface opposite to the top surface 7a2. The "side surfaces 7a1, 7a4" of the first cooling body 7a refer to surfaces that are perpendicular or nearly perpendicular to the top surface 7a2. Various dimensions of the cooling body 7 can be selected depending on the shape and dimensions of the stave 5, the cooling efficiency, and other performance factors.

The horizontal cross-sectional shape of the first cooling body 7a may be any shape, but in order for the cooling body 7 to efficiently cool the refractory material 9, it is preferable that the cooling body 7 is rectangular or approximately rectangular as shown in FIG. 3. When the horizontal cross-sectional shape of the first cooling body 7a is rectangular (or approximately rectangular), it is more preferable to arrange the long side of the rectangle on the furnace inside of the stave 5. This is because, by arranging in this manner, in an embodiment in which multiple cooling bodies 7 are arranged in the blast furnace 20, the number of cooling bodies 7 installed in the blast furnace 20 can be reduced, thereby making it possible to reduce the number of iron shell openings 21 on the furnace body iron shell for the piping 17 described later. Even more preferably, the shape of the first cooling body 7a can be determined so that the first cooling body 7a has a horizontal cross-sectional shape that is, for example, trapezoidal or sector-shaped, so that the cooling body 7 can be arranged in contact with the furnace inside surface of the stave 5 according to the curved shape of the stave 5 along the inner surface of the furnace body iron shell 3.

(2.2. Stave)
The stave 5 in the present disclosure is not particularly limited, and any known stave in the art can be used. In the present disclosure, the stave 5 is disposed on the inner side of the furnace body shell 3 of the blast furnace 20. The stave 5 disposed on the inner side of the furnace body shell 3 is typically cooled by flowing a coolant such as water through its internal piping (not shown), thereby protecting the furnace body shell 3 from high-temperature reactions in the blast furnace. In one embodiment, the stave 5 is installed and fixed inside the furnace body shell 3 by bolting. For this reason, the furnace body shell 3 is provided with an opening for inserting the bolt. In addition, the head of the bolt on the front side of the furnace body shell 3 is covered with a cap so that the high-pressure gas inside the furnace does not blow out, and the blow-through of the high-pressure gas is suppressed. In FIG. 2, as an example, the staves 5, 5' are installed in the morning glory portion Z1 and the upper region of the morning glory portion Z1. In a preferred embodiment, a plurality of staves 5 are provided around the entire inner surface of the furnace body shell 3. In one embodiment, the piping of the stave 5 and the piping 17 of the cooling body 7 described above are separate systems. By making the piping of the cooling body 7 and the stave 5 separate systems in this way, even if the cooling body 7 is damaged, the stave 5 protects the furnace body iron shell 3, so that the blast furnace operation can be continued as it is. The material of the stave 5 in the present disclosure is not particularly limited, but is preferably made of iron casting, copper or a copper alloy, for example, from the viewpoints of workability, thermal conductivity, price, etc.

The shape of the stave 5 in this disclosure is not particularly limited, but can generally be plate-shaped. The stave 5 in this disclosure can be selected from a variety of sizes depending on the shape of the blast furnace 20, the installation position within the blast furnace, the desired performance, etc.

The stave 5 in this disclosure can have a stave opening 23. The position of the stave opening 23 is preferably set so as to correspond to the position of the pipe connection part 19 for connecting the pipe 17 to the refrigerant flow path 15 inside the cooling body 7 described above.

In one embodiment, the position of the stave opening 23 of the stave 5 can be determined to correspond to the position of the piping connection 19 of the existing cooling body 7. In another embodiment, particularly in an embodiment in which the blast furnace cooling structure 30 according to the present disclosure is provided in an existing blast furnace 20, the stave opening 23 can be provided on the stave 5 so as not to interfere with the refrigerant piping inside the stave 5, and then the cooling body 7 can be fabricated so as to determine the position of the piping connection 19 of the cooling body 7 to correspond to the stave opening 23. Therefore, the blast furnace cooling structure 30 according to the present disclosure has the advantage that it can be installed relatively easily and has a high degree of design freedom not only when used in a new blast furnace 20 but also when used as a retrofit to an existing blast furnace 20.

Also, there may be some gap between the stave opening 23 of the stave 5 and the pipe 17. This is because the stave 5 is generally curved and the pipe 17 is straight. In such a case, in order to fix the cooling body 7 in a fixed position, it is preferable that the gap between the stave opening 23 and the pipe 17 is sealed with an amorphous refractory. Examples of such amorphous refractory include, but are not limited to, castable refractory and spray material.

(2.3. Cooling effect by cooling body)
The refractory material 9 is arranged so as to be continuous along the entire circumference of the inner wall of the stave 5, similar to the cooling body 7. As shown in FIG. 4, at the height position where the cooling body 7 is arranged, the refractory material 9 is arranged on the first cooling body 7a, and the second cooling body 7b is inserted between the adjacent refractory materials 9. In addition, the surface of the refractory material 9 on the inside of the blast furnace 20 is in the range of 70° to 80° with respect to the horizontal direction starting from point P in FIG. 2, similar to the surface of the second cooling body 7b on the inside of the blast furnace 20.

By placing the refractory 9 on the first cooling body 7a, the refractory 9 is cooled from below by the first cooling body 7a. Furthermore, by inserting the second cooling body 7b between adjacent refractory pieces 9, the refractory 9 is cooled from the left and right by the second cooling body 7b. In this way, the refractory 9 between adjacent second cooling bodies 7b is cooled in a U-shaped region consisting of the two second cooling bodies 7b on the left and right and the first cooling body 7a at the bottom. Therefore, the entire area of the refractory 9 is reliably cooled by both the first cooling body 7a and the second cooling body 7b.

As described above, it is important that the ideal profile of the working surface of the morning glory portion Z1 in the furnace is stably maintained for a long period of time at an angle θ1 relative to the horizontal direction of the inner surface of the blast furnace 20 in the range of 70° to 80°. If this angle range cannot be maintained, the refractories 9 above and below the cooling body 7 will be damaged and the profile will become uneven. This will cause the descent behavior of the charge in the blast furnace 20 to become unstable, which will cause problems in maintaining stable operation of the blast furnace 20, that is, in maintaining a stable supply of ore and coke to the most reactive activated part (tuyere part) in the blast furnace 20. In order to achieve stable operation of the blast furnace 20, it is necessary that the profile of the morning glory portion Z1 be stably maintained for a long period of time.

However, if the second cooling body 7b is not provided and the refractory material 9 is cooled only by a horizontal cooling body (i.e., the first cooling body 7a), the horizontal cooling body can only cool the refractory material 9 at the same height position within the blast furnace 20, and therefore the cooling of the refractory material 9 may be insufficient.

Figure 5 is a diagram showing how the profile of the inside of the blast furnace 20 becomes uneven when the refractory 9 is cooled by a cooling body 7 that is not provided with a second cooling body 7b. In the example shown in Figure 5, the cooling body 7 does not have a second cooling body 7b and is composed only of a cooling body 7 extending in the horizontal direction, and the cooling body 7 is arranged so as to be continuous along the entire circumference of the inner wall of the stave 5. The refractory 9 is arranged on top of the cooling body 7. The configuration example shown in Figure 5 corresponds to the configuration described in, for example, Patent Document 3 mentioned above.

In the case of a cooling body 7 configured as shown in FIG. 5, the refractory material 9 is not sufficiently cooled, and the refractory material 9 is damaged over time, and the refractory material 9 is lost in the loss range R shown in the figure. This causes the profile of the inside of the blast furnace 20 to become uneven, and the descent behavior of the charge becomes unstable.

In addition, since the cooling body 7 is supported by the refractory material 9 underneath, if the refractory material 9 underneath the cooling body 7 disappears, the cooling body 7 will be supported by the pipe 17 in a cantilevered manner, which may cause problems such as the pipe 17 breaking.

On the other hand, FIG. 6 is a diagram showing the disappearance range R' of the refractory 9 due to aging when the refractory 9 is cooled by the cooling body 7 according to this embodiment. FIG. 6 shows a cross section at the position of the refractory 9 (a cross section along the dashed line II-II' shown in FIG. 3). As shown in FIG. 6, the entire area of the refractory 9 is cooled by both the first cooling body 7a and the second cooling body 7b, so that the disappearance of the refractory 9 due to aging is suppressed, and the disappearance range R' is significantly smaller than the disappearance range R shown in FIG. 4.

Therefore, according to this embodiment, the profile of the inside of the blast furnace 20 is prevented from becoming uneven, and the descent behavior of the charge material in the blast furnace 20 is stabilized. This allows the ore and coke to be stably supplied to the tuyere portion in the blast furnace 20, enabling stable operation of the blast furnace 20.

(2.4. Preventing Cooling Pipe Breakage)
The refractory material 9 in the morning glory portion Z1 of the blast furnace 20 is stacked continuously from the bottom of the blast furnace 20. The refractory material 9 expands upward due to heat in the blast furnace 20. At the height position of the cooling body 7 in the blast furnace 20, the refractory material 9 may expand upward by about 30 mm to 50 mm due to aging after the blast furnace 20 is operated.

Figure 7 is a cross-sectional view showing a state in which a load is placed on the water supply and drainage pipes 17 of a cooling body 7 that does not have a second cooling body 7b as a result of the refractory material 9 expanding upward. The configuration example shown in Figure 5 corresponds to the configuration described in, for example, the aforementioned Patent Document 1, just like Figure 5.

As shown in Figure 7, when the refractory material 9 expands upward, a shear force F1 and a bending moment F2 act on the cooling body 7, causing the piping 17 of the cooling body 7 to break at the point A2 shown in Figure 7, and the cooling function of the cooling body 7 to be lost. As a result, the cooling ability of the refractory material 9 is lost, and the wear of the refractory material 9 progresses rapidly, further promoting the unevenness of the profile as described above, and further destabilizing the operation of the blast furnace 20.

Furthermore, if the refractory material 9 disappears due to aging as described above, and especially if the refractory material 9 on the upper part of the cooling body 7 disappears, the resistance to the shear force F1 and bending moment F2 decreases, and the pipe 17 becomes more likely to break. In addition, as in the configuration described in Patent Document 3 described above, if the stave 5 arranged above the stave 5 of the morning glory section Z1 protrudes toward the inside of the furnace, the protruding part of the stave 5 arranged on the upper part receives an upward force due to expansion, and it is possible to resist the shear force F1 and bending moment F2 for a relatively short period after construction. However, even in such a structure, if the refractory material 9 on the upper part of the cooling body 7 disappears due to aging, the resistance to the shear force F1 and bending moment F2 decreases, and the pipe 17 becomes more likely to break.

In this embodiment, the influence of the expansion of the refractory 9 is suppressed by utilizing the taper of the morning glory portion Z1. As shown in FIG. 2, in the morning glory portion Z1 of the blast furnace 20, the inner wall 5a of the stave 5 facing the cooling body 7 on the inside of the furnace is a tapered surface whose inner diameter decreases from bottom to top. For this reason, the inner wall 5a of the stave 5 is inclined at an angle of θ2 shown in FIG. 2. And the facing surface 7b1 of the second cooling body 7b facing the inner wall 5a of the stave 5 is a surface along the tapered surface of the stave 5, is in contact with or close to the tapered surface, and is inclined at an angle of θ2 so as to be parallel to the inner wall 5a of the stave 5. According to this configuration, even if the refractory 9 expands and a force acts to push up the cooling body 7 from the bottom to the top, the inner wall 5a of the stave 5 is inclined at an angle of θ2, so that the upward force to push up the cooling body 7 is eliminated by the taper effect. As a result, the shear force F1 and bending moment F2 shown in FIG. 7 do not act on the water supply and drainage pipes 17. Therefore, the cooling body 7 is prevented from rising due to the expansion of the refractory material 9, which would damage the pipes 17.

8 and 9 are diagrams showing a specific example of suppressing the influence of the expansion of the refractory 9 by utilizing the taper of the morning glory portion Z1. In the example shown in FIG. 8, a spacer 8 is inserted between the inner wall 5a of the stave 5 and the second cooling body 7b. In the example shown in FIG. 9, the inner wall 5a of the stave 5 and the opposing surface 7b1 of the second cooling body 7b facing the stave 5 are in close contact with each other. With this configuration, when the refractory 9 expands and a force acts to push the cooling body 7 upward from below, the cooling body 7 is reliably suppressed from moving upward. As a result, the shear force F1 and bending moment F2 as shown in FIG. 7 do not act on the water supply and drainage pipes 17, and the cooling body 7 is prevented from rising due to the expansion of the refractory 9 and damaging the pipes 17. In the example shown in FIG. 8, instead of inserting the spacer 8, a protrusion corresponding to the spacer 8 may protrude from the cooling body 7 or the stave 5.

2, 8 and 9, the cooling body 7 is fixed to the furnace body shell 3 by bolts 6 at at least two points spaced apart in the vertical direction, and is fixed to the furnace body shell 3 by two bolts 6, one at the top and one at the bottom. More specifically, the lower bolt 6 is attached to the first cooling body 7a, and the upper bolt 6 is attached to the second cooling body 7b. The upper and lower bolts 6 pass through the stave opening 23a of the stave 5 and the shell opening 21a of the furnace body shell 3, and nuts are fastened to the bolts 6 protruding to the outside of the furnace body shell 3. Alternatively, two bolts 6 may be inserted from the outside of the furnace body shell 3 into the shell opening 21a and the stave opening 23a, and the bolts 6 may be fastened to the screw holes provided in the first cooling body 7a and the second cooling body 7b. In this way, being fixed by the bolts 6 includes both fastening nuts to the bolts 6 that are attached to the cooling body 7 in advance, and fastening bolts 6 to screw holes provided in the cooling body 7. This allows the cooling body 7 to be stably fixed to the furnace body shell 3 at two points, top and bottom. Therefore, the shear force F1 and bending moment F2 shown in FIG. 7 do not act on the water supply and drainage pipes 17. This prevents the cooling body 7 from rising due to the expansion of the refractory material 9, which would damage the pipes 17. In addition, the heads of the nuts or bolts on the front side of the furnace body shell 3 are covered with caps to prevent the high-pressure gas inside the furnace from blowing out, preventing the high-pressure gas from blowing through.

In addition, it is possible to support the cooling body 7 with the bolts 6 in the same manner even in a horizontal cooling body 7 without the second cooling body 7b as shown in FIG. 7, but in this case, since the cooling body 7 does not extend in the vertical direction, the cooling body 7 cannot be supported by the bolts 6 at multiple points separated in the vertical direction. Therefore, it is not possible to fully obtain the effect in terms of suppressing the shear force F1 and bending moment F2 as shown in FIG. 7, and it is particularly difficult to suppress the bending moment F2. In this embodiment, by providing the second cooling body 7b extending in the vertical direction, the cooling body 7 can be supported by the bolts 6 at multiple points separated in the vertical direction, so that the shear force F1 and bending moment F2 are reliably suppressed.

In addition to or instead of fixing the cooling body 7 with the bolts 6, the upper surface of the second cooling body 7b may be abutted against the lower surface of the stave 5' at the top of the morning glory section Z1, so that the force pushing up the cooling body 7 is received by the stave 5'. This configuration also reliably suppresses the shear force F1 and bending moment F2.

According to the present disclosure, in addition to the above-mentioned cooling effect and the suppression of breakage of the pipe 17, the cooling of the furnace body shell 3 is left to the stave 5, and the cooling body 7 can cool the refractory material (e.g., bricks) 9. Therefore, even if one or more of the cooling bodies 7 in the blast furnace are damaged, the refractory material 9 in contact with the cooling body 7 will no longer be cooled, but the damaged cooling body 7 will not have to be replaced. This is because the protection of the furnace body shell 3 is guaranteed by the stave 5. Therefore, when the blast furnace cooling structure 30 according to the present disclosure is used, it is not necessary to provide a large opening on the furnace body shell for replacing the cooling body. For example, in one embodiment of the present disclosure, the opening on the furnace body shell is sufficient only to pass the pipe 17 for sending the refrigerant to the cooling body 7. Therefore, when multiple cooling bodies 7 are arranged in a blast furnace, the multiple cooling bodies 7 are arranged in a row on the same plane (typically on a substantially horizontal plane) while maintaining the strength of the blast furnace 20, and the refractory material 9 can be cooled highly efficiently and uniformly. Therefore, by using the blast furnace cooling structure 30 according to the present disclosure, the stave 5 arranged on the furnace side of the furnace body shell 3 can ensure protection of the furnace body shell 3, while the cooling body 7 arranged on the furnace side of the stave 5 can cool the refractory material 9 highly efficiently and uniformly, and even in a high-temperature environment such as the morning glory portion Z1, wear of the refractory material 9 due to the high-temperature environment can be sufficiently suppressed. Therefore, the life of the refractory material 9 can be extended, and the effect of stabilizing blast furnace operation can be obtained.

Furthermore, another advantage of being able to greatly reduce the size of the opening on the furnace body shell is that the blast furnace cooling structure 30 according to the present disclosure can be installed on an existing blast furnace 20. For example, for an existing blast furnace 20 in which a stave 5 and a refractory material 9 are installed in the morning glory portion Z1, the cooling body 7 can be arranged according to the present disclosure to provide the blast furnace cooling structure 30 according to the present disclosure on the existing blast furnace 20. The reason why the blast furnace cooling structure 30 according to the present disclosure can be installed on the existing blast furnace 20 in this way is that, as described above, it is not necessary to provide an opening for replacing the cooling body on the furnace body shell, and in one embodiment, it is sufficient to provide an opening for the piping 17 for the refrigerant on the furnace body shell. Furthermore, the position of the opening for the piping 17 for the refrigerant can be freely determined on the furnace body shell so as not to interfere with the piping of the existing stave 5. Therefore, by using the blast furnace cooling structure 30 according to the present disclosure in an existing blast furnace 20, it is possible to reduce repair costs and reuse equipment, thereby significantly reducing time and costs.

(2.5. Variations in the configuration of the cooling body 7)
10 to 14 are schematic diagrams showing variations in the configuration of the cooling body 7. Fig. 10 and Fig. 11 show examples in which each cooling body 7 is composed of one first cooling body 7a and one second cooling body 7b. Of these, Fig. 10 shows an example in which the second cooling body 7b is arranged at the end of the first cooling body 7a, and Fig. 11 shows an example in which the second cooling body 7b is arranged in the center of the first cooling body 7a. The configuration example shown in Fig. 11 corresponds to the left and right cooling bodies 7 of the three cooling bodies 7 shown in Figs. 3 and 4.

Figure 12 shows an example in which each cooling body 7 is composed of one first cooling body 7a and two second cooling bodies 7b. In the configuration example shown in Figure 11, the second cooling bodies 7b are arranged on both ends of the first cooling body 7a.

In the configuration example shown in FIG. 12, the distance between the two second cooling bodies 7b is determined by a design value, so the cooling body 7 shown in FIG. 12 and the refractory material 9 to be inserted between the two second cooling bodies 7b can be manufactured in parallel according to the predetermined design value. This shortens the construction period when constructing the blast furnace 20, and since the refractory material 9 manufactured based on the design value can be inserted between the two second cooling bodies 7b during construction, construction can be carried out carefully in a place with a good working environment, and furnace construction work can be carried out with high construction accuracy. As a result, the gap between the cooling body 7 and the refractory material 9 can be minimized, and preferably the two can be brought into contact with each other, so the cooling effect of the refractory material 9 is improved. This extends the life of the refractory material 9, contributing to stable operation of the blast furnace 20.

Figure 13 shows an example in which each cooling body 7 is composed of one first cooling body 7a and two second cooling bodies 7b, 7b' arranged above and below the first cooling body 7a. The second cooling body 7b is arranged above the first cooling body 7a, and the second cooling body 7b' is arranged below the first cooling body 7a. In the blast furnace 20, refractory material 9 is also arranged below the first cooling body 7a, and the second cooling body 7b' arranged below the first cooling body 7a is inserted between the adjacent refractory materials 9 below the first cooling body 7a.

Figure 14 shows an example in which each cooling body 7 is composed of one first cooling body 7a and two second cooling bodies 7b' arranged below it. As shown in Figure 14, the cooling body 7 may be one that only includes the second cooling body 7b' arranged below the first cooling body 7a. In addition, in the configuration examples shown in Figures 13 and 14, two second cooling bodies 7b' may be arranged below the first cooling body 7a, as in Figure 12.

[3. Blast Furnace]
The blast furnace 20 according to the present disclosure includes a furnace body shell 3 and a blast furnace cooling structure 30 according to the present disclosure described above. In a preferred embodiment, the blast furnace 20 according to the present disclosure includes a blast furnace cooling structure 30 including a plurality of cooling bodies 7. In this case, in the blast furnace 20 according to the present disclosure, a plurality of cooling bodies 7 can be arranged intermittently or continuously so as to be connected in the circumferential direction on the furnace inner side of the furnace body shell 3. That is, "arranged so as to be connected" means to arrange intermittently (not in close contact, and there may be a gap between the cooling bodies) or to arrange continuously (without a gap). In one embodiment of the blast furnace 20 according to the present disclosure, for example, in the morning glory portion Z1, staves 5 are arranged intermittently or continuously in the circumferential direction on the furnace inner side of the furnace body shell 3, at least one cooling body 7 is arranged on the furnace inner side of each stave 5, and a refractory material 9 is arranged in contact with the cooling body 7.

In addition, in one preferred embodiment of the blast furnace 20 according to the present disclosure, multiple cooling bodies 7 are arranged on a substantially horizontal plane in the circumferential direction on the furnace inner side of the furnace body shell 3. Therefore, for example, in the blast furnace, the cooling bodies 7 can be arranged intermittently on the same plane in the circumferential direction, for example on a substantially horizontal plane. That is, a gap can be intentionally provided between the cooling bodies 7. More preferably, the cooling bodies 7 can be arranged continuously on a substantially horizontal plane. Note that, with respect to the two pipe connection parts 19 of the cooling body 7 arranged on the furnace inner side of the stave 5, both may face the same single stave, or each may face two adjacent staves.

In an embodiment in which the first cooling body 7a of the cooling body 7 is plate-shaped, it is preferable that the upper surface 7a2 of the first cooling body 7a faces upward in the blast furnace. In other words, it is preferable that the plate-shaped first cooling body 7a is arranged so as to protrude from the stave 5 toward the inside of the furnace. By arranging in this manner, in an embodiment in which multiple cooling bodies 7 are arranged in the blast furnace, in the region of the blast furnace 20 in which the blast furnace cooling structure 30 according to the present disclosure is installed, for example, in the morning glory portion Z1, the cooling bodies 7 are arranged so as to be continuous on the same plane along the circumferential direction of the blast furnace 20, and the refractory material 9 can be cooled highly efficiently and uniformly around the entire circumference in the circumferential direction, thereby extending the life of the refractory material 9 and enabling stable operation of the blast furnace 20 for a long period of time.

(3.1. Furnace shell)
In the blast furnace 20 according to the present disclosure, the furnace body shell 3 may be one known in the art. As described above, it is not necessary to provide an opening for replacing the cooling body 7. Since there is no opening for replacing the cooling body 7 in the furnace body shell 3, it is possible to install multiple cooling bodies in the blast furnace. When the cooling structure 30 for a blast furnace according to the present disclosure and the cooling body 7 are arranged, it is possible to arrange the cooling structure 30 for a blast furnace and the cooling body 7 in a circumferential direction on the furnace inner side of the furnace body shell 3.

The furnace body shell 3 in this disclosure typically has a shell opening 21 for passing through the piping 17 for the refrigerant of the cooling body 7. The position of this shell opening 21 preferably coincides with the position of the stave opening 23 of the stave 5 and the piping connection part 19 of the cooling body 7 in order to pass through the piping 17.

Generally, there are other openings in the furnace body shell 3 for various uses. Furthermore, when the blast furnace cooling structure 30 according to the present disclosure is used, as explained above, there is no need to provide an opening for replacing the cooling body 7. Therefore, in a blast furnace 20 using the blast furnace cooling structure 30 according to the present disclosure, the arrangement of openings to be provided throughout the blast furnace can be determined relatively freely, providing the advantage of a high degree of design freedom.

(3.2. Refractories)
As the refractory 9 in the present disclosure, one or both of a shaped refractory and an unshaped refractory can be used. As the shaped refractory, for example, concrete or brick, for example, a graphite-based or carbon-based brick having high thermal conductivity, or a silicon nitride-based shaped brick having high slag resistance can be used, but is not limited thereto. As the unshaped refractory, for example, a castable refractory or a spraying material can be used, but is not limited thereto. Preferably, the refractory 9 is a shaped refractory, and more preferably, it is a brick. In the blast furnace 20 according to the present disclosure, the refractory 9 is arranged in contact with or in close proximity to the first cooling body 7a and the second cooling body 7b of the cooling body 7. In one embodiment, the refractory 9 is arranged without gaps so as to surround the periphery of the cooling body 7. By arranging the refractory 9 around the cooling body 7 without gaps, the cooling body 7 can efficiently cool the refractory 9, and the cooling body 7 can be protected by the refractory 9.

In another embodiment, the cooling body 7 is supported by the refractory material 9. By supporting the cooling body 7 by the refractory material 9, it is no longer necessary to support the cooling body 7 by the furnace body shell 3, and processing of the furnace body shell 3 to support the cooling body 7 is no longer necessary, making it possible to further reduce the opening of the furnace body shell 3, and further making it easier to install in an existing blast furnace 20.

The shape of the refractory material 9 in this disclosure may be, for example, a rectangular parallelepiped or approximately rectangular parallelepiped. In addition, although not limited thereto, the refractory material 9 may generally be a rectangular parallelepiped or approximately rectangular parallelepiped with each side measuring 30 to 500 mm.

As used herein, "arranged continuously" with respect to the blast furnace cooling structure 30 means that the blast furnace cooling structure 30 (i.e., the staves 5) are arranged on the inside of the furnace body shell 3 with substantially no gaps. In this case, "arranged substantially without gaps" means that they are arranged sufficiently close together without any intentional gaps, but exceptionally, there may be gaps that are unavoidable in terms of installation or gaps provided for other purposes.

As used herein, "arranged so as to be continuous on a substantially horizontal plane" for the cooling bodies 7 means that a plurality of cooling bodies 7 are arranged along the inner wall of the stave 5 on a surface substantially parallel to the horizontal plane so as to sufficiently cool the refractory material 9 in the circumferential direction of the blast furnace 20, and as described above, means that they are arranged intermittently or continuously. More specifically, there may be a gap between adjacent cooling bodies 7 on a substantially horizontal plane, and the gap may be equal to or less than the length of the cooling body 7 in the circumferential direction (the length along the stave 5).

In the blast furnace 20 according to the present disclosure, typically, it is preferable to arrange the first cooling bodies 7a of the multiple cooling bodies 7 in one tier so as to be connected on a substantially horizontal plane (i.e., connected on one surface substantially parallel to the horizontal plane). By arranging the multiple first cooling bodies 7a in one tier on the same plane in this manner, it is possible to cool the surrounding refractory material 9 highly efficiently and uniformly. In another embodiment, it is also possible to arrange the multiple cooling bodies 7 in two or more tiers connected on a substantially horizontal plane. For example, when it is desired to further increase the cooling capacity for the refractory material 9, it is possible to arrange the cooling bodies 7 according to the present disclosure in multiple tiers. In this way, the cooling of the refractory material 9 is increased, so that it may be possible to use a refractory material 9 of a different material, for example, a cheaper refractory material 9.

As described above, according to this embodiment, the refractory material 9 is cooled by the cooling body 7 having the first cooling body 7a and the second cooling body 7b. This prevents the profile inside the blast furnace 20 from becoming uneven, and stabilizes the descent behavior of the charge material inside the blast furnace 20. Therefore, since the ore and coke are stably supplied to the tuyere portion inside the blast furnace 20, stable operation of the blast furnace 20 is possible, and a long life of the blast furnace 20 is realized.

According to the present disclosure, by using the blast furnace cooling structure according to the present disclosure, which is a novel configuration, more specifically, by arranging at least one cooling body on the inner side of the stave arranged on the inner side of the furnace shell, it is possible to simultaneously achieve both protection of the furnace shell and an extension of the life of the refractories in the blast furnace. This makes it possible to extend the life of refractories such as bricks in the blast furnace, particularly in high-temperature areas such as the morning glory, and enables stable blast furnace operation over a long period of time, and therefore the present disclosure can be said to be an invention of extremely high industrial value.

3 Furnace shell 5 Stave 7 Cooling body 7a First cooling body 7a1, 7a4 Side surface 7a2 Top surface 7a3 Bottom surface 7b Second cooling body 6 Bolt 9 Refractory 9a Refractory (tuyere brick)
REFERENCE SIGNS LIST 11 tuyere 15 coolant flow passage 17 piping 19 piping connection portion 20 blast furnace 21, 21a iron shell opening 23, 23a stave opening 30 blast furnace cooling structure Z1 morning glory portion Z2 furnace belly

Claims (5)

A plurality of cooling bodies arranged in a row in the circumferential direction of the blast furnace on the inner side of the furnace body shell;
A refractory material disposed in contact with or in close proximity to the cooling body;
Equipped with
The cooling body has a first cooling body extending horizontally in a circumferential direction of the blast furnace and at least one second cooling body extending upward or downward from the first cooling body,
The length of the second cooling body in the circumferential direction of the blast furnace is shorter than the length of the first cooling body in the circumferential direction of the blast furnace,
The refractory material is arranged above or below the first cooling body and between two second cooling bodies adjacent to each other in the circumferential direction of the blast furnace.
Cooling structure for blast furnace. The cooling structure for a blast furnace according to claim 1, wherein the cooling body has two or more of the second cooling bodies, and the two or more second cooling bodies are arranged adjacent to each other in the circumferential direction of the blast furnace. Further comprising a stave arranged on the furnace inner side of the furnace body iron shell,
The cooling structure for a blast furnace according to claim 1 or 2, wherein the cooling body is arranged further inside the furnace than the stave. The inner wall of the stave facing the cooling body on the inside of the furnace is a tapered surface whose inner diameter decreases from bottom to top,
The cooling structure for a blast furnace according to claim 3, wherein an opposing surface of the second cooling body opposing the inner wall of the stave is a surface along the tapered surface of the stave and is in contact with or close to the tapered surface. The cooling structure for a blast furnace according to claim 4, wherein the cooling body is fixed to the furnace shell by bolts at least two points spaced apart in the vertical direction.

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