Blast furnace hearth structure

Abstract

The present application relates to a kind of blast furnace hearth hearth structure, belong to metallurgical industry field.The hearth structure is composed of hearth bottom (4) and hearth side wall (3), the inboard of hearth structure is provided with elephant foot gasket (5), the outside of hearth structure is provided with cooling wall (2) and furnace shell (1), the outside of furnace shell (1) is arranged with several reinforcing rib plates (7) in one circle interval, and the effect of strengthening support is formed to hearth structure.The present application is by the outer wall of hearth structure being set as circular arc, and make cooling wall (2) and furnace shell (1) present concentric circular arc, so that the cooling intensity of cooling wall (2) to hearth structure is greater, more uniform, beneficial to the solidification line (9) of molten iron to hearth structure inside direction shift, form circular arc shape in hearth structure inside and iron layer, effectively weaken or prevent the formation of elephant foot shape erosion, prolong the life of hearth.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical industry and relates to a blast furnace hearth structure. Background Technology

[0002] The hearth is a crucial part of the blast furnace, and its lifespan depends particularly on the erosion of the lower part of the dead iron layer and the area at the junction of the hearth and the furnace bottom (commonly known as the elephant foot zone).

[0003] To prevent erosion in the elephant's foot area, some colleagues have proposed thickening the inner wall of the furnace hearth in this area, or pre-installing a pot-bottom shaped liner in the elephant's foot area. These solutions are all quite effective. However, if... Figure 1 As shown, in the traditional furnace hearth structure, the distance between the lower cooling wall of the hearth and the refractory material in the elephant foot area increases, and the cooling intensity of the refractory material in the elephant foot area decreases. As a result, the elephant foot area cannot form a pot-bottom shaped solidified iron layer and will still form elephant foot-shaped erosion. Therefore, this structure has an inherent defect.

[0004] Ideally, the distance between the cooling wall and all points in the elephant foot refractory area should be as equal as possible. This ensures equal cooling intensity across the refractory area and facilitates the formation of a pot-bottom-shaped solidified iron layer on the hearth inner wall, thus preventing elephant foot erosion and extending the hearth's lifespan. The refractory area between this ideal structure and the traditional structure is ineffective, or even counterproductive to the safety of the elephant foot refractory area. Therefore, a completely new design is needed for this part of the hearth structure. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a blast furnace hearth structure that reduces the ineffective refractory material zone, which is conducive to pushing the molten iron solidification line towards the inside of the hearth structure, so that the cooling wall has a more uniform and stronger cooling effect on the refractory material in the foot area.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A blast furnace hearth structure includes a hearth bottom and a hearth sidewall arranged around the hearth bottom, the hearth bottom and the hearth sidewall forming a container-shaped hearth structure; a furnace shell is provided on the outer wall of the hearth structure, and a plurality of reinforcing ribs for supporting the furnace shell are arranged at intervals around the bottom of the outer side of the furnace shell; the bottom of the furnace shell is arc-shaped, and the side of the reinforcing ribs near the furnace shell matches the shape of the furnace shell.

[0008] Optionally, a cooling wall is provided between the furnace cylinder structure and the furnace shell for cooling the furnace cylinder structure.

[0009] Optionally, the bottom outer wall of the furnace cylinder structure and the cooling wall on the bottom outer wall are both arc-shaped.

[0010] Optionally, the arc shape of the bottom outer wall of the furnace shell and furnace cylinder structure, and the arc shape of the cooling wall on the bottom outer wall are concentric, so that the cooling range of the furnace cylinder structure is more uniform.

[0011] Optionally, the area where the furnace hearth sidewall meets the furnace hearth bottom is designated as the "elephant foot" area, and an elephant foot liner is installed inside the elephant foot area, closely adhering to the furnace hearth structure. The elephant foot liner provides targeted reinforcement and protection to the furnace hearth structure in the elephant foot area, thereby extending the service life of the furnace hearth structure.

[0012] Optionally, the elephant foot liner has an arc-shaped side away from the furnace structure.

[0013] Optionally, through the cooling effect of the cooling wall, an isothermal line, i.e., the molten iron solidification line, is formed inside the elephant foot area. The molten iron solidification line is arc-shaped and concentric with the arc shape of the furnace hearth.

[0014] Optionally, the furnace hearth structure is placed on the ground by means of the reinforcing ribs, and the distance from the bottom of the reinforcing ribs to the ground is less than or equal to the distance from the bottom surface of the furnace hearth to the ground, so as to realize the reinforcing ribs' role in strengthening and supporting the furnace hearth structure.

[0015] Optionally, the furnace hearth structure is made of refractory material.

[0016] Optionally, the refractory material is carbon brick. Other materials can also be flexibly selected according to the actual situation.

[0017] The beneficial effects of this invention are as follows:

[0018] The hearth structure of this invention facilitates the shift of the molten iron solidification line inwards, resulting in a smooth and uniform solidification line that minimizes the extent of ineffective refractory material zones. This leads to a more uniform and stronger cooling effect on the refractory material in the elephant foot area of ​​the cooling wall. Simultaneously, the arc-shaped structure at the bottom of the hearth structure promotes the formation of an arc-shaped, pot-bottom-like solidified iron layer within the hearth structure, effectively reducing or preventing the formation of elephant foot-like erosion and extending the service life of the hearth structure.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the traditional blast furnace hearth structure.

[0022] Figure 2 This is a schematic diagram of the blast furnace hearth structure of the present invention.

[0023] Figure label:

[0024] 1. Furnace shell, 2. Cooling wall, 3. Hearth sidewall, 4. Hearth bottom, 5. Elephant foot liner, 6. Elephant foot area refractory, 7. Reinforcing rib, 8. Ineffective refractory area, 9. Molten iron solidification line. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0027] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] Please see Figure 2 A blast furnace hearth structure includes a hearth bottom 4 and a hearth sidewall 3 arranged around the hearth bottom 4. The hearth bottom 4 and the hearth sidewall 3 form a container-shaped hearth structure. The area where the hearth sidewall 3 and the hearth bottom 4 meet is the elephant foot area, and the outer wall of the elephant foot area is arc-shaped.

[0029] Inside the elephant foot area of ​​the container-shaped furnace hearth structure, an elephant foot liner 5 is installed, closely attached to the furnace hearth structure. The side of the elephant foot liner 5 away from the furnace hearth structure is arc-shaped. The arc-shaped elephant foot liner 5 can provide targeted reinforcement and protection for the furnace hearth structure in the elephant foot area, thereby extending the service life of the furnace hearth structure.

[0030] Both the bottom 4 and the side wall 3 of the furnace hearth are made of refractory material. In some embodiments of the present invention, the refractory material can be carbon bricks. In actual implementation, the material can be flexibly selected according to the site conditions.

[0031] A cooling wall 2 is provided on the outer side of the furnace cylinder structure, which is in close contact with the furnace cylinder structure. A furnace shell 1 is provided on the side of the cooling wall 2 away from the furnace cylinder structure. The furnace shell 1, the bottom outer wall of the furnace cylinder structure, and the cooling wall 2 on the bottom outer wall are all concentric arcs.

[0032] The cooling wall 2 cools the hearth structure, but the cooling range is limited. It will form an isothermal line inside the hearth structure, namely the molten iron solidification line 9. The molten iron solidification line 9 is arc-shaped and is also concentric with the furnace shell 1.

[0033] like Figure 2 As shown, a number of reinforcing ribs 7 are arranged at intervals around the bottom of the outer wall of the furnace shell 1 to support the furnace shell 1. The furnace cylinder structure is placed on the ground by the reinforcing ribs 7, and the distance from the bottom of the reinforcing rib 7 to the ground is less than or equal to the distance from the bottom surface of the furnace cylinder bottom 4 to the ground, so as to realize the reinforcing support of the furnace cylinder structure by the reinforcing ribs.

[0034] The hearth structure of this invention facilitates the shift of the molten iron solidification line towards the interior of the hearth structure. Furthermore, the molten iron solidification line 9 is smooth and uniform, minimizing the extent of the ineffective refractory material zone 8. This results in a more uniform and stronger cooling effect on the refractory material 6 in the elephant foot region of the cooling wall 2. Simultaneously, the arc-shaped structure at the bottom of the hearth structure facilitates the formation of an arc-shaped, pot-bottom-shaped solidified iron layer inside the hearth structure, effectively reducing or preventing the formation of elephant foot-like erosion and extending the service life of the hearth structure.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A blast furnace hearth structure, comprising a hearth bottom (4) and a hearth sidewall (3) arranged around the hearth bottom (4), wherein the hearth bottom (4) and the hearth sidewall (3) form a container-shaped hearth structure; characterized in that: A furnace shell (1) is provided on the outer wall of the furnace cylinder structure, and a number of reinforcing ribs (7) for supporting the furnace shell (1) are provided at intervals around the bottom of the outer side of the furnace shell (1). The bottom of the furnace shell (1) is arc-shaped, and the side of the reinforcing rib (7) near the furnace shell (1) matches the shape of the furnace shell (1); A cooling wall (2) is provided between the furnace cylinder structure and the furnace shell; the bottom outer wall of the furnace cylinder structure and the cooling wall (2) on the bottom outer wall are all arc-shaped; the furnace shell (1), the bottom outer wall of the furnace cylinder structure and the cooling wall (2) on the bottom outer wall are all concentric arc-shaped; The area where the side wall (3) of the furnace cylinder meets the bottom (4) of the furnace cylinder is called the elephant foot area. An elephant foot pad (5) is provided inside the elephant foot area, which is closely attached to the furnace cylinder structure. The side of the elephant foot pad (5) away from the furnace cylinder structure is arc-shaped. The molten iron solidification line (9) is formed inside the elephant foot area by the cooling effect of the cooling wall (2). The molten iron solidification line (9) is arc-shaped and has the same center as the arc shape of the furnace shell (1).

2. The blast furnace hearth structure according to claim 1, characterized in that: The furnace hearth structure is placed on the ground by the reinforcing rib (7), and the bottom of the reinforcing rib (7) is less than or equal to the distance between the bottom surface of the furnace hearth bottom (4) and the ground.

3. The blast furnace hearth structure according to claim 1, characterized in that: The furnace hearth structure is made of refractory material.

4. The blast furnace hearth structure according to claim 3, characterized in that: The refractory material is carbon brick.

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