Heat preservation type long nozzle

Abstract

The utility model relates to the field of steel-making continuous casting long nozzle devices, and particularly discloses a heat preservation type long nozzle which comprises a bowl opening part, a body middle section, a body lower section and a molten steel runner which is arranged in the long nozzle and sequentially penetrates through the bowl opening part, the body middle section and the body lower section. A first layer of long nozzle body, a heat insulation fiber cotton layer, a glass sleeve layer, a second layer of long nozzle body and a refractory material layer are sequentially arranged on the side wall of the body middle section from inside to outside. The long nozzle is provided with the heat insulation fiber cotton layer and the glass sleeve layer, the heat insulation fiber cotton layer is small in heat conductivity coefficient, the glass sleeve layer is of a vacuum structure, the natural heat dissipation speed of the long nozzle can be reduced, heat loss of molten steel at the long nozzle can be reduced, and therefore the temperature of the molten steel in a steel ladle can be properly reduced to a certain extent; and therefore, the temperature of the molten steel of the hanging ladle is reduced, the energy consumption required in the refining process is reduced, meanwhile, the macroscopic quality of a continuous casting steel billet can be improved, and the benefits of a steel mill are increased.

Description

Technical Field

[0001] The utility model relates to the field of long nozzle devices for steelmaking continuous casting, and particularly relates to a heat-insulating long nozzle. Background Technique

[0002] During the continuous casting process, according to the flow sequence of molten steel, the natural temperature drop of molten steel mainly includes the temperature drop in the ladle, the temperature drop in the long nozzle, the temperature drop in the tundish, and the temperature drop in the submerged nozzle. Usually, the length of the long nozzle is more than 1.3 times the length of the submerged nozzle. It can be seen that the length of the long nozzle is relatively long. For this reason, the natural heat dissipation of the long nozzle is greater than that of the submerged nozzle. Whether it is to control energy consumption or control the macrostructure quality of the continuous casting billet, it is very necessary to control the natural heat dissipation of the long nozzle.

[0003] At present, corresponding temperature control devices have appeared for the tundish and the submerged nozzle, but there are relatively few devices for heating or insulating the long nozzle. The temperature drop of molten steel in the long nozzle mainly occurs through heat conduction, transferring from the long nozzle body to the air. The utility model patent CN204052890U proposes a heat-insulating sleeve for the long nozzle. A heatable heat-insulating sleeve is installed around the long nozzle. The heat-insulating sleeve is composed of refractory materials. By spraying fire into the heat-insulating sleeve, the heat preservation and heating of the long nozzle are realized. The heating method of this patent determines that a fire supply system is required, which makes this patent have relatively large potential safety hazards and relatively complex operations. If the operation is improper, it is extremely easy to cause an explosion. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a heat-insulating long nozzle. The utility model has a good heat preservation effect, can reduce the natural heat dissipation speed of the long nozzle, reduce the heat loss of molten steel at the long nozzle part, and thus can reduce the temperature of the molten steel in the ladle to a certain extent, reduce the smelting energy consumption, and improve the macrostructure quality of the continuous casting billet; the structure is simple, no additional auxiliary equipment is required, reducing potential safety hazards; the operation is not changed, and the labor intensity of the operators is not increased, effectively solving the problems existing in the background technique.

[0005] The utility model is realized through the following technical solutions:

[0006] A heat-insulating long nozzle, comprising: a bowl mouth part, a middle section of the body, a lower section of the body, and a molten steel flow channel. The molten steel flow channel is arranged inside the long nozzle and sequentially penetrates through the bowl mouth part, the middle section of the body, and the lower section of the body. The side wall of the middle section of the body is sequentially provided with a first-layer long nozzle body, a heat-insulating fiber cotton layer, a glass sleeve layer, a second-layer long nozzle body, and a refractory material layer from the inside to the outside.

[0007] A further improvement scheme of the utility model is:

[0008] The side wall of the bowl mouth part is a hollow structure, and an argon inlet is provided at the upper part of the outer side of the side wall.

[0009] Furthermore, a slag line is provided at the upper part of the outer side of the side wall of the lower section of the body.

[0010] Furthermore, the first-layer long nozzle body is sintered and formed, and the thickness is 22 mm.

[0011] Furthermore, the heat-insulating fiber cotton layer is a single-layer structure, made of aluminosilicate fiber cotton, with a thickness of 2 mm, and is arranged on the outer surface of the first-layer long nozzle body.

[0012] Furthermore, the glass sleeve layer is a single-layer vacuum structure, made of high borosilicate glass, with a vacuum layer thickness of 3 mm, and is arranged on the outer surface of the heat-insulating fiber cotton layer.

[0013] Furthermore, the second-layer long nozzle body is formed by isostatic pressing and sintering, with a thickness of 10 mm, and is arranged on the outer surface of the glass sleeve layer.

[0014] Furthermore, the refractory material layer is a single-layer structure, made of alumina fiber, with a thickness of 2 mm, and is arranged on the outer surface of the second-layer long nozzle body. Beneficial Effects

[0015] Compared with the prior art, the present utility model has the following obvious advantages:

[0016] The present utility model is provided with a heat-insulating fiber cotton layer and a glass sleeve layer. The heat-insulating fiber cotton layer has a small thermal conductivity, and the glass sleeve layer is a vacuum structure. Through the functions of the heat-insulating fiber cotton layer and the glass sleeve layer, the natural heat dissipation speed of the long nozzle can be reduced, and the heat loss of the molten steel at the long nozzle part can be reduced. Thus, to a certain extent, the temperature of the molten steel in the ladle can be appropriately reduced, and then the temperature of the molten steel in the suspended ladle can be reduced, reducing the energy consumption required in the refining process. At the same time, the macrostructure quality of the continuous casting billet can also be improved, increasing the benefits of the steel plant.

[0017] The present utility model is provided with a second-layer long nozzle body on the outer side of the glass sleeve layer, increasing the thickness and strength of the middle section of the body. A refractory material layer is also provided on the outer side of the second-layer long nozzle body, which can avoid the high-temperature damage of the internal structure and improve the service life.

[0018] The structure of the present utility model is simple, without the need to add any auxiliary equipment, reducing potential safety hazards; the operation method of the present utility model is no different from that of the existing long nozzle, without increasing the labor intensity of the operators. Description of the Drawings

[0019] Figure 1 is a schematic front sectional structure view of the present utility model;

[0020] Figure 2 is the present utility modelFigure 1 Schematic enlarged view of part A;

[0021] Description of reference numerals:

[0022] 11. First-layer long nozzle body; 12. Second-layer long nozzle body; 2. Insulating fiber cotton layer; 3. Glass sleeve layer; 4. Refractory material layer; 5. Slag line; 6. Argon inlet. Specific embodiments

[0023] The present utility model will be described in detail below with reference to the accompanying drawings.

[0024] As Figure 1 、 2 shown, the present utility model patent provides a heat-insulating long nozzle, including a bowl mouth part, a middle part of the body, a lower part of the body, and a molten steel flow channel. The molten steel flow channel is arranged inside the long nozzle and sequentially penetrates through the bowl mouth part, the middle part of the body, and the lower part of the body. The side wall of the bowl mouth part is a hollow structure, and an argon inlet 6 is arranged on the upper part of the outer side of the side wall. Before the continuous casting process starts, argon is introduced into the bowl mouth part through the argon inlet 6 to isolate the air and form an argon seal; when molten steel flows from the ladle tapping hole into the bowl mouth part of the present utility model, back suction can be avoided, preventing the molten steel from contacting the outside air and oxidizing, which affects the quality of cast steel.

[0025] The lower part of the body is easily eroded by the basic covering agent and the ladle slag. The upper part of the outer side of the side wall is the most easily eroded part, and a slag line 5 is arranged here, which can improve the service life of the lower part.

[0026] As Figure 1 、 2 shown, the side wall of the middle part of the body is sequentially provided with a first-layer long nozzle body 11, an insulating fiber cotton layer 2, a glass sleeve layer 3, a second-layer long nozzle body 12, and a refractory material layer 4 from the inside to the outside. The first-layer long nozzle body 11 is sintered and formed. Insulating fiber cotton is wound on the outer surface of the first-layer long nozzle body 11 to form an insulating fiber cotton layer 2; then a glass sleeve is sleeved on the insulating fiber cotton layer 2 to form a glass sleeve layer 3; the second-layer long nozzle body 12 is sintered on the outer surface of the glass sleeve layer 3 by static pressure forming; finally, a refractory material is wrapped on the outer layer of the long nozzle body 12 to form a refractory material layer 4.

[0027] The thickness of the first-layer long nozzle body 11 is 22 mm; the heat-insulating fiber cotton layer 2 is a single-layer structure, made of aluminosilicate fiber cotton, with a thickness of 2 mm, and is arranged on the outer surface of the first-layer long nozzle body 11; the glass sleeve layer 3 is a single-layer vacuum structure, made of borosilicate glass, with a vacuum layer thickness of 3 mm, and is arranged on the outer surface of the heat-insulating fiber cotton layer 2; the second-layer long nozzle body 12 has a thickness of 10 mm and is arranged on the outer surface of the glass sleeve layer 3; the refractory material layer 4 is a single-layer structure, made of alumina fiber, with a thickness of 2 mm, and is arranged on the outer surface of the second-layer long nozzle body. The heat-insulating fiber cotton layer 2 and the glass sleeve layer 3 with a vacuum structure can slow down the heat dissipation speed of the long nozzle to the air, thereby slowing down the cooling speed of the molten steel flowing into the long nozzle. Setting the second-layer long nozzle body 12 outside the glass sleeve layer 3 can increase the strength and thickness of the middle section of the body. The refractory material layer 4 arranged on the outermost side can prevent the internal structure from being damaged at high temperatures and improve the service life.

[0028] During use, as Figure 1 shown, the molten steel flows into the bowl part of the present invention from the ladle sub-nozzle and flows downward along the molten steel flow channel. In the molten steel flow channel, the molten steel dissipates heat to the air through the side wall of the middle section of the body. The side wall is successively provided with the first-layer long nozzle body 11, the heat-insulating fiber cotton layer 2, the glass sleeve layer 3, the second-layer long nozzle body 12, and the refractory material layer 4 from the inside to the outside, reducing the heat loss of the molten steel. The cooling speed of the molten steel slows down, and it flows to the lower section of the body at a higher temperature and then flows into the tundish from the lower section of the body, which can meet the requirements of the continuous casting process.

[0029] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat-insulating shroud, comprising: A bowl mouth portion, a middle section of a main body, a lower section of a main body, and a molten steel flow channel, wherein the molten steel flow channel is arranged inside the long nozzle and sequentially passes through the bowl mouth portion, the middle section of the main body, and the lower section of the main body; it is characterized in that the side wall of the middle section of the main body is sequentially provided with a first layer of a long nozzle body (11), a heat insulating fiber cotton layer (2), a glass sleeve layer (3), a second layer of a long nozzle body (12), and a refractory material layer (4) from the inside to the outside.

2. The heat-insulating shroud according to claim 1, characterized in that: The side wall of the bowl mouth is a hollow structure, and an argon gas inlet (6) is provided at the upper outer portion of the side wall.

3. The heat-insulating shroud according to claim 1, characterized in that: A slag line (5) is provided at the upper outer portion of the side wall of the lower section of the body.

4. The heat-insulating shroud according to claim 1, characterized in that: The first-layer shroud body (11) is sintered and has a thickness of 22 mm.

5. The heat-insulating shroud according to claim 1, characterized in that: The heat-insulating fiber cotton layer (2) is a single-layer structure, made of aluminum silicate fiber cotton, with a thickness of 2 mm, and is arranged on the outer surface of the first-layer long shroud body (11).

6. The heat-insulating shroud according to claim 1, characterized in that: The glass sleeve layer (3) is a single-layer vacuum structure, made of high borosilicate glass, with a vacuum layer thickness of 3 mm, and is arranged on the outer surface of the heat-insulating fiber cotton layer (2).

7. The heat-insulating shroud according to claim 1, characterized in that: The second-layer shroud body (12) is formed by static pressure sintering, has a thickness of 10 mm, and is arranged on the outer surface of the glass sleeve layer (3).

8. The heat-insulating shroud according to claim 1, characterized in that: The refractory material layer (4) is a single-layer structure, made of alumina fiber, with a thickness of 2 mm, and is arranged on the outer surface of the second-layer long shroud body (12).

Images