Tuyere small sleeve and blast furnace tuyere device

Abstract

The utility model discloses a tuyere small sleeve and a blast furnace tuyere device, the tuyere small sleeve comprises a base body, the base body is provided with a blowing channel, the blowing channel extends along the axial direction of the base body, and the fluid output end of the blowing channel is the front end of the base body; the air inlet assembly is installed on the outer side wall of the base body, the air inlet end of the air inlet assembly is located at the rear end of the base body, and the air inlet assembly extends in the axial direction of the base body; the base body is sleeved with the gas distribution part, the gas distribution part is located at the position close to the front end of the base body, the gas distribution part is fixedly connected with the outer side wall of the base body, the gas distribution part is provided with a gas chamber, and the gas chamber communicates with the gas outlet end of the gas inlet assembly; a gap is formed between the side, close to the front end of the base body, of the gas distribution piece and the outer side wall of the base body, and the gap is used for blowing gas in the gas chamber to the front end of the base body. A high-speed gas barrier is formed on the outer side wall of the base body, when slag iron in a furnace drips to be close to the outer side wall of the tuyere small sleeve, high-speed gas flow can quickly blow away the slag iron, and melting loss of the tuyere small sleeve is prevented.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnaces, and in particular to a tuyere sleeve and a blast furnace tuyere device. Background Technology

[0002] Blast furnace smelting is a method of continuously producing liquid products (such as pig iron) in a blast furnace using coke, raw materials (such as iron ore), and solvents (limestone, dolomite). In blast furnace smelting, coke, raw materials, and solvents are charged into the blast furnace through the inlet at the top. Preheated air is blown in through the tuyeres located at the bottom of the blast furnace, or auxiliary fuels (pulverized coal, heavy oil, natural gas) are injected. At high temperatures, the carbon in the coke or auxiliary fuel burns with the oxygen in the blown air to produce carbon monoxide and hydrogen. As the hydrogen rises within the furnace, it removes oxygen from the raw materials, thus yielding the liquid product.

[0003] The tuyere sleeve assembly is a crucial component in blast furnace smelting production, responsible for supplying air or injecting auxiliary fuel into the furnace. Because its front end extends into the furnace and operates under extremely high temperatures, its working conditions are very harsh. In actual use, the tuyere sleeve assembly is easily damaged by slag and iron dripping, as well as by abrasion from the furnace charge and high-temperature melting. Utility Model Content

[0004] The purpose of this invention is to provide a tuyere sleeve and a blast furnace tuyere device. By forming a high-speed gas barrier on the outer wall of the substrate, when slag and iron dripping into the furnace approaches the outer wall of the tuyere sleeve, the high-speed airflow can quickly blow away the slag and iron, preventing the tuyere sleeve from melting.

[0005] The first aspect of this utility model provides a small air vent sleeve, comprising: a base having a blowing channel extending axially along the base, the fluid output end of the blowing channel being the front end of the base; an air inlet assembly mounted on the outer wall of the base, the air inlet end of the air inlet assembly being located at the rear end of the base, and the air inlet assembly extending axially along the base; and a gas distributor sleeved on the base, the gas distributor being located near the front end of the base, the gas distributor being connected and fixed to the outer wall of the base, the gas distributor having an air chamber communicating with the air outlet end of the air inlet assembly; wherein, a gap exists between the side of the gas distributor near the front end of the base and the outer wall of the base, the gap being used to blow the gas in the air chamber toward the front end of the base.

[0006] Furthermore, the gaps are continuously distributed circumferentially along the outer wall of the substrate to blow the gas in the air chamber toward the front end of the substrate, thereby forming a protective gas film on the circumferential outer wall of the front end of the substrate; or, the gaps are spaced circumferentially along the outer wall of the substrate to blow the gas in the air chamber toward the front end of the substrate, thereby forming a protective gas film on a portion of the outer wall of the front end of the substrate.

[0007] Furthermore, the gas distribution component includes an end cap, a collar, and a frustum-shaped sleeve. The two ends of the collar are fixedly connected to the large end faces of the end cap and the frustum-shaped sleeve, respectively. The frustum-shaped sleeve has a large end face and a small end face, and the frustum-shaped sleeve gradually increases in size from the front end to the rear end of the base along the axial direction of the base. The end cap is fixedly connected to the outer wall of the base, and the end cap, collar, frustum-shaped sleeve, and the outer wall of the base form the gas chamber. The front end of the gas chamber is a gradually narrowing flared opening.

[0008] Furthermore, the frustum sleeve has a through hole on one side of the small end face, and the diameter of the through hole is set to be larger than the outer diameter of the base body, so as to form a continuous gap in the circumferential direction along the outer side wall of the base body; or, the frustum sleeve is connected in a closed manner to a portion of the outer side wall of the base body on one side of the small end face, so as to form a spaced gap in the circumferential direction along the outer side wall of the base body.

[0009] Furthermore, the frustum sleeve has a through hole on one side of the small end face, the through hole is adapted to the base body, and the side wall of the through hole has grooves distributed circumferentially, the grooves forming the gap.

[0010] Furthermore, the air intake assembly includes multiple air intake pipes, which are spaced apart circumferentially along the base; a flange is provided at the rear end of the base, the air intake pipes pass through the flange, and the air intake end of the air intake pipes is exposed above the flange; and the air outlet end of the air intake pipes passes through the end cap, so as to realize that the air outlet end of the air intake pipes is connected to the air chamber.

[0011] Furthermore, a refractory material layer is provided on the outer wall of the substrate. The refractory material layer is located between the flange and the gas distribution component. The refractory material layer is used to cover the air intake pipe to protect the air intake pipe.

[0012] Furthermore, the substrate is provided with a cooling chamber, which is used to exchange heat between the input coolant and the substrate;

[0013] The flange is provided with an inlet and an outlet. The inlet is used to input coolant, and the outlet is used to output coolant. Both the inlet and the outlet are connected to the cooling chamber.

[0014] The second aspect of this utility model provides a blast furnace tuyere device, including the aforementioned tuyere sleeve.

[0015] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0016] In this embodiment of the invention, when the tuyeres sleeve is installed on the furnace wall of the blast furnace, the front end of the base extends into the blast furnace. The specific location of the gas distribution component on the base is preferably close to the area where slag and iron easily drip into the furnace. In this way, the gas entering the gas chamber from the gas inlet pipe blows towards the front end of the base, which can cover the area where slag and iron easily drip into the furnace. This forms a high-speed gas barrier (referred to as "gas film") on the outer wall of the base. When slag and iron drip into the furnace and approach the outer wall of the tuyeres sleeve, the high-speed airflow can quickly blow away the slag and iron, preventing the tuyeres sleeve from melting and thus extending its service life. The high-speed airflow can also blow away coke and slag and iron near the front end of the tuyeres sleeve, preventing wear and melting of the front end. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the air vent sleeve according to the first embodiment of the present utility model (the refractory material layer is not shown);

[0018] Figure 2 This is a structural schematic diagram of the air vent sleeve according to the second embodiment of the present utility model (the refractory material layer is not shown);

[0019] Figure 3 This is a three-dimensional structural diagram of the air vent sleeve according to the third embodiment of this utility model;

[0020] Figure 4 This is a structural schematic diagram of the air vent sleeve according to the fourth embodiment of this utility model.

[0021] Figure label:

[0022] 11. Matrix; 12. Gas distribution component; 13. Purge channel; 14. Gas chamber; 15. Inlet pipe; 16. Through hole; 17. Flange; 18. Refractory material layer; 19. Cooling chamber; 20. Inlet; 21. Outlet;

[0023] 121. End cap; 122. Collar; 123. Frustum sleeve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model. In this document, terms such as first, second, and third are used only to distinguish one feature from another and are not intended to claim or imply any order or association between these features.

[0025] The tuyere sleeve assembly is a crucial component in blast furnace smelting, responsible for supplying air or injecting auxiliary fuel. Because its front end extends into the furnace, operating under extremely harsh conditions due to the high temperatures, it is susceptible to damage from slag and iron dripping, as well as wear from furnace charge and high-temperature melting. Traditional protective measures include optimizing heat exchange in the tuyere sleeve assembly, overlaying with high-temperature alloys, and installing ceramic discs for protection. However, optimizing heat exchange is generally ineffective at cooling large amounts of concentrated heat; overlaying with high-temperature alloys is prone to failure due to their low heat resistance; and ceramic discs are brittle and lack toughness, easily shattering and detaching under heat, resulting in limited protective effectiveness.

[0026] Based on this, embodiments of the present invention provide a small air vent sleeve, such as... Figures 1-4 As shown, it includes: a base 11, an air intake assembly, and a gas distribution component 12. The base 11 has a spray channel 13 extending axially along the base 11, with the fluid output end of the spray channel 13 being the front end of the base 11; an air intake assembly mounted on the outer wall of the base 11, with the air intake end of the air intake assembly located at the rear end of the base 11 and extending axially along the base 11; a gas distributor 12 sleeved on the base 11, with the gas distributor 12 located near the front end of the base 11, the gas distributor 12 being connected and fixed to the outer wall of the base 11, and the gas distributor 12 having an air chamber 14 communicating with the air outlet end of the air intake assembly; wherein, a gap exists between the side of the gas distributor 12 near the front end of the base 11 and the outer wall of the base 11, the gap being used to blow the gas in the air chamber 14 toward the front end of the base 11.

[0027] Specifically, the base 11 can be configured as a frustum conical structure, with the small end face of the base 11 serving as the front end face and the large end face serving as the rear end face. The front end of the base 11 extends into the blast furnace, and a jetting channel 13 is provided inside the base 11. The jetting channel 13 is used to supply air to the furnace or inject auxiliary fuel or other fluids. The jetting channel 13 can be configured as a conical hole that gradually increases in size from the front end to the rear end of the base 11. The fluid in the jetting channel 13 is transported from the rear end to the front end of the base 11 to deliver the fluid into the furnace. The air intake assembly may include, for example, an air intake pipe 15. The outlet end of the air intake pipe 15 can be inserted into the gas chamber 14 of the gas distributor 12 and welded to the gas distributor 12 to achieve communication between the outlet end of the air intake pipe 15 and the gas chamber 14. Then, the gas distributor 12 is fitted onto the base 11, and the rear end of the gas distributor 12 can be welded firmly to the base 11. The gas distributor 12 is located near the base 11. Near the front end of the base 11, the inlet end of the gas inlet pipe 15 can extend rearward to the rear end of the base 11 and can extend until it passes through the furnace wall of the blast furnace. When the tuyer sleeve is installed on the furnace wall of the blast furnace, the front end of the base 11 extends into the blast furnace. The specific location of the gas distribution component 12 on the base 11 is preferably close to the area where slag and iron are easy to drip in the furnace, that is, located at the rear end of the area where slag and iron are easy to drip. In this way, the gas entering the gas chamber 14 from the gas inlet pipe 15 blows towards the front end of the base 11, which can cover the area where slag and iron are easy to drip in the furnace. This can form a high-speed gas barrier (referred to as "gas film") on the outer wall of the base 11. In this way, when slag and iron drip down near the outer wall of the tuyer sleeve, the high-speed airflow can quickly blow away the slag and iron, prevent the tuyer sleeve from melting and thus extend the service life of the tuyer sleeve. The high-speed airflow can also blow away the coke and slag and iron near the front end of the tuyer sleeve, preventing wear and melting of the front end. The gas blown into the intake pipe 15 can be an inert gas, such as nitrogen, and the gas pressure can be set to 0.4-0.9 MPa. When the gas blown into the intake pipe 15 is nitrogen, the gas film formed at the front end of the base 11 can also cool the base 11, thereby protecting the air outlet sleeve.

[0028] In some embodiments, the gaps are circumferentially and continuously distributed along the outer sidewall of the substrate 11 to blow the gas in the air chamber 14 toward the front end of the substrate 11, thereby forming a protective gas film circumferentially on the outer sidewall of the front end of the substrate 11; or, the gaps are circumferentially spaced along the outer sidewall of the substrate 11 to blow the gas in the air chamber 14 toward the front end of the substrate 11, thereby forming a protective gas film on a portion of the outer sidewall of the front end of the substrate 11. Specifically, the gap is connected to the gas chamber 14. When the gap is continuously distributed circumferentially along the outer wall of the base 11, the inert gas in the gas chamber 14 can be blown to the front end of the base 11 through the gap, thereby forming a uniform protective gas film on the circumferential side of the outer wall of the front end of the base 11. When the gap is distributed intermittently circumferentially along the outer wall of the base 11, the gas distribution component 12 and the outer wall of the base 11 can be intermittently welded to achieve partial closure and enhance the airflow intensity in the local area. For example, when the tuyeres are installed on the furnace wall of the blast furnace, the front end of the base 11 extends into the blast furnace. The top area of ​​the base 11 is easily damaged by slag and iron dripping, and the bottom area is more easily worn by the airflow in the furnace. The left and right sides of the base 11 are relatively less prone to wear. Therefore, gaps can be formed between the top and bottom areas of the base 11 and the gas distribution component 12, and the left and right sides of the base 11 are closed. This can be achieved by welding without leaving gaps.

[0029] In some embodiments, the gas distribution component 12 includes an end cap 121, a collar 122, and a frustum-shaped sleeve 123. The two ends of the collar 122 are fixedly connected to the large end faces of the end cap 121 and the frustum-shaped sleeve 123, respectively. The frustum-shaped sleeve 123 has a large end face and a small end face, and the frustum-shaped sleeve 123 gradually increases in size from the front end to the rear end of the base 11 along the axial direction of the base 11. The end cap 121 is fixedly connected to the outer side wall of the base 11, and the end cap 121, collar 122, frustum-shaped sleeve 123, and the outer side wall of the base 11 form the gas chamber 14. The front end of the gas chamber 14 is a gradually narrowing flared opening. Specifically, the gap is connected to the front end of the air chamber 14. The end cap 121 can be set as an annular sleeve. The inner hole of the end cap 121 is adapted to the base 11. The end cap 121 can be firmly welded to the outer wall of the base 11. The outer periphery of the end cap 121 is firmly welded to the collar 122. The front end of the collar 122 is firmly welded to the large end face of the frustum sleeve 123. A gap can be left between the small end face of the frustum sleeve 123 and the outer wall of the base 11. Thus, the end cap 121, collar 122, frustum sleeve 123 and the outer wall of the base 11 form a cavity, which constitutes the air chamber 14. The high-pressure inert gas entering the air chamber 14 can be buffered and evenly distributed. The front end of the air chamber 14 is a gradually narrowing flared mouth. In this way, the inert gas blown out through the gap is more uniform and easier to control to form a protective gas film.

[0030] In some embodiments, the frustum sleeve 123 has a through hole 16 on one side of its small end face, and the diameter of the through hole 16 is set to be larger than the outer diameter of the base 11, so as to form a continuous gap in the circumferential direction along the outer wall of the base 11; or, the frustum sleeve 123 is partially closed to the outer wall of the base 11 on one side of its small end face, so as to form a spaced gap in the circumferential direction along the outer wall of the base 11. Specifically, by setting the diameter of the through hole 16 to be slightly larger than the outer diameter of the base 11, gaps can be formed on the outer wall of the base 11; when the gaps are continuously distributed in the circumferential direction along the outer wall of the base 11, the inert gas in the gas chamber 14 can be blown towards the front end of the base 11 through the gaps, thereby forming a uniform protective gas film in the circumferential direction on the outer wall of the front end of the base 11; when the gaps are spaced apart in the circumferential direction along the outer wall of the base 11, that is, the gas distribution component 12 and the outer wall of the base 11 can be intermittently welded, so as to achieve partial The area is enclosed, which strengthens the airflow intensity in the local area; for example, when the tuyeres are installed on the furnace wall of the blast furnace, the front end of the base 11 extends into the blast furnace. The top area of ​​the base 11 is easily damaged by slag and iron dripping, and the bottom area is more easily worn by the airflow in the furnace. The left and right sides of the base 11 are relatively less prone to wear. Therefore, gaps can be formed between the top and bottom areas of the base 11 and the gas distribution component 12. The left and right sides of the base 11 are enclosed, which can be achieved by welding without leaving gaps.

[0031] In some embodiments, the frustum sleeve 123 has a through hole 16 on one side of its small end face. The through hole 16 is adapted to the base 11. The sidewall of the through hole 16 has grooves spaced circumferentially, forming the gap. By providing grooves spaced circumferentially on the sidewall of the through hole 16 to form the gap, the inert gas in the gas chamber 14 is blown towards the front end of the base 11 through the gap, thereby making it easier to control the formation of a uniform protective gas film on the circumferential direction of the outer sidewall of the front end of the base 11. The shape of the grooves can be rectangular, triangular, or trapezoidal, etc., and is not limited in detail here. Those skilled in the art will understand that the airflow in the furnace usually forms a swirling zone at the front end of the substrate 11. The airflow in the swirling zone is mixed with particles such as coke and slag iron, which can easily cause wear to the front end of the substrate 11. In this embodiment, the high-speed airflow formed by the inert gas can also blow away the coke and slag iron near the front end of the substrate 11, making it less likely for a swirling zone of the airflow in the furnace to form at the front end of the substrate 11, thus preventing wear and melting of the front end of the substrate 11. When the gas distribution component 12 is fitted on the substrate 11, the closer it is to the front end of the substrate 11, the better the protection effect of the high-speed airflow formed by the inert gas on the front end of the substrate.

[0032] In some embodiments, the air intake assembly includes a plurality of air intake pipes 15, which are spaced apart circumferentially along the base 11; a flange 17 is provided at the rear end of the base 11, through which the air intake pipes 15 pass, with the air intake end of the air intake pipes 15 exposed above the flange 17; and the air outlet end of the air intake pipes 15 passes through the end cap 121, so that the air outlet end of the air intake pipes 15 is connected to the air chamber 14. Specifically, the intake pipe 15 can be a round pipe or other shaped pipe. The number of intake pipes 15 can be, for example, 4, 6 or 8, and they can be evenly distributed along the circumference of the base 11. The rear end of the base 11 can be provided with a flange 17. The corresponding holes for the intake pipes 15 can be machined on the flange 17 first. After the intake pipes 15 are firmly welded to the gas distribution component 12, the gas distribution component 12 is sleeved on the base 11 and the intake pipes 15 are inserted into the corresponding holes. Then the gas distribution component 12 is firmly welded to the base 11, and the intake pipes 15 are firmly welded to the flange 17. The intake end of the intake pipes 15 is exposed on the flange 17, and the intake pipes 15 can be extended until they pass through the furnace wall of the blast furnace. This facilitates the connection between the intake pipes 15 and the main gas blowing pipe, and also makes it easy to disassemble and install when maintaining or replacing the tuyeres sleeves in the future.

[0033] In some embodiments, a refractory material layer 18 is provided on the outer wall of the substrate 11. The refractory material layer 18 is located between the flange 17 and the gas distribution component 12, and is used to cover the air inlet pipe 15 to protect it. (Reference) Figure 3-4 The refractory layer 18 can be made of unshaped refractory material, which can be made into a slurry, paste, or loose form and directly cast onto the outer wall of the substrate 11 to form a seamless integral structure. This allows the front and rear ends of the refractory layer 18 to form a seamless connection with the gas distribution component 12 and the flange 17, respectively, thus better protecting the intake pipe 15 from damage. Figure 1-2 The refractory material layer is not shown.

[0034] In some embodiments, the substrate 11 is provided with a cooling chamber 19, which is used to exchange heat between the input coolant and the substrate 11. The flange 17 is provided with an inlet 20 and an outlet 21. The inlet 20 is used to input coolant, and the outlet 21 is used to output coolant. Both the inlet 20 and the outlet 21 are connected to the cooling chamber 19. A flow guide (not shown in the figure) can be installed in the cooling chamber 19 to guide the flow of cooling water in the cooling chamber 19. When cooling water is introduced into the cooling chamber 19 in the substrate 11 through the inlet 20 and then output through the outlet 21, the substrate 11 can be continuously cooled and cooled, which can extend the service life of the air vent sleeve. The air intake pipe 15 is staggered from the cooling water inlet 20 and outlet 21 in the circumferential direction of the flange 17.

[0035] The second aspect of this utility model provides a blast furnace tuyere device, including the aforementioned small tuyere sleeve. The blast furnace tuyere device may further include a medium tuyere sleeve and a large tuyere sleeve; wherein, the medium tuyere sleeve is connected to the rear end of the small tuyere sleeve, and the large tuyere sleeve is connected to the rear end of the medium tuyere sleeve; the three sleeves are sequentially connected to form the blast furnace tuyere device. The blast furnace tuyere device is installed on the furnace wall at the bottom of the blast furnace and distributed along the furnace perimeter. The injection channel of the tuyere sleeve is for supplying air into the furnace or injecting fluids such as auxiliary fuel. The front end of the base extends into the blast furnace. The specific position of the gas distribution component 12 on the base 11 is preferably close to the area where slag and iron are easy to drip into the furnace. In this way, the inert gas entering the gas chamber 14 from the gas inlet pipe 15 blows towards the front end of the base 11, which can cover the area where slag and iron are easy to drip into the furnace. This can form a gas film on the outer wall of the base 11. When slag and iron drip into the furnace and approach the outer wall of the tuyere sleeve, the high-speed airflow can quickly blow away the slag and iron, prevent the tuyere sleeve from melting and damage, and thus extend the service life of the tuyere sleeve. The high-speed airflow can also blow away coke and slag and iron near the front end of the tuyere sleeve, preventing wear and melting of the front end.

[0036] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A small air vent cover, characterized in that, include: A substrate having a jetting channel extending axially along the substrate, wherein the fluid output end of the jetting channel is the front end of the substrate; An air intake assembly is mounted on the outer side wall of the base, with the air intake end of the air intake assembly located at the rear end of the base, and the air intake assembly extending along the axial direction of the base; A gas distributor is sleeved on the substrate, with the gas distributor located near the front end of the substrate. The gas distributor is fixedly connected to the outer wall of the substrate. The gas distributor has a gas chamber that communicates with the gas outlet end of the inlet assembly. The gas distribution component has a gap between the side of the gas distribution component near the front end of the substrate and the outer wall of the substrate, the gap being used to blow the gas in the gas chamber toward the front end of the substrate.

2. The air vent sleeve according to claim 1, characterized in that, The gaps are continuously distributed circumferentially along the outer wall of the substrate to blow the gas in the air chamber toward the front end of the substrate, thereby forming a protective gas film circumferentially on the outer wall of the front end of the substrate; or... The gaps are circumferentially spaced along the outer side wall of the substrate to blow the gas in the air chamber toward the front end of the substrate, thereby forming a protective gas film on a portion of the outer side wall of the front end of the substrate.

3. The air vent sleeve according to claim 2, characterized in that, The gas distribution component includes an end cap, a collar, and a frustum-shaped sleeve. The two ends of the collar are fixedly connected to the large end faces of the end cap and the frustum-shaped sleeve, respectively. The frustum-shaped sleeve has a large end face and a small end face, and the frustum-shaped sleeve gradually increases in size from the front end to the rear end of the base along the axial direction of the base. The end cap is connected and fixed to the outer wall of the base. The end cap, collar, frustum sleeve and the outer wall of the base form the air chamber. The front end of the air chamber is a gradually narrowing flared opening.

4. The air vent sleeve according to claim 3, characterized in that, The frustum sleeve has a through hole on one side of its small end face. The diameter of the through hole is larger than the outer diameter of the base body, so as to form a continuous gap in the circumferential direction along the outer side wall of the base body; or, The frustum sleeve is located on one side of the small end face and is connected in a closed manner to a portion of the outer wall of the base, so as to form the gaps distributed in the circumferential direction along the outer wall of the base.

5. The air vent sleeve according to claim 3, characterized in that, The frustum sleeve has a through hole on one side of the small end face. The through hole is adapted to the base body. The side wall of the through hole has grooves that are spaced apart in the circumferential direction, and the grooves form the gap.

6. The air vent sleeve according to any one of claims 3-5, characterized in that, The air intake assembly includes multiple air intake pipes, which are distributed at intervals along the circumference of the base. The base has a flange at its rear end, the air inlet pipe passes through the flange, and the air inlet end of the air inlet pipe is exposed on the flange; and the air outlet end of the air inlet pipe passes through the end cap, so as to realize that the air outlet end of the air inlet pipe is connected to the air chamber.

7. The air vent sleeve according to claim 6, characterized in that, A refractory material layer is provided on the outer wall of the substrate. The refractory material layer is located between the flange and the gas distribution component. The refractory material layer is used to cover the air inlet pipe to protect the air inlet pipe.

8. The air vent sleeve according to claim 6, characterized in that, The substrate is provided with a cooling chamber, which is used to exchange heat between the input coolant and the substrate. The flange is provided with an inlet and an outlet. The inlet is used to input coolant, and the outlet is used to output coolant. Both the inlet and the outlet are connected to the cooling chamber.

9. A blast furnace tuyere device, characterized in that, Includes the air vent sleeve as described in any one of claims 1-8.

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