Tuyere small sleeve and blast-furnace tuyere device combining ceramic protection and mortise and tenon connection

Abstract

The utility model discloses a tuyere small sleeve and a blast furnace tuyere device combining ceramic protection and tenon-and-mortise connection, the tuyere small sleeve is characterized in that a 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; a first connecting part is arranged at the front end of the base body; the protection piece is of an annular structure, the protection piece is matched with the front end face of the base body, the protection piece is provided with a binding face making contact with the front end face of the base body, and the binding face is provided with a second connecting part matched with the first connecting part; the second connecting part is connected with the first connecting part through a mortise and tenon joint structure, so that the protection piece is mounted at the front end of the base body, and the protection piece covers the front end face of the base body. The second connecting part is connected with the first connecting part through the mortise and tenon joint structure, so that the protective part and the base body are firmly connected, the protective part is of an integral structure, the protective part can effectively protect the front end face of the base body, and the risk that the base body is damaged due to furnace burden abrasion and high-temperature melting can be reduced.

Description

Ceramic protective tuyer sleeve and blast furnace tuyer device with mortise and tenon joints Technical Field

[0001] This utility model relates to the technical field of blast furnaces, and in particular to a ceramic protective tuyer sleeve with mortise and tenon joint connection and a blast furnace tuyer 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 flux (limestone, dolomite). In blast furnace smelting, coke, raw materials, and flux are charged into the blast furnace through the inlet at the top. Preheated air or auxiliary fuels (pulverized coal, heavy oil, natural gas) are blown in through the tuyeres located at the bottom of the blast furnace along its perimeter. 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 these gases rise within the furnace, oxygen is removed from the raw materials, thus yielding the liquid product.

[0003] 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 and operates under extremely high temperatures, its working conditions are very harsh. In actual use, a swirling zone easily forms on the front face of the tuyere sleeve assembly, making it susceptible to damage from furnace charge abrasion and high-temperature melting. Existing ceramic protective plates are typically installed by welding limiting rings or blocks between two adjacent plates. However, these limiting rings or blocks, due to their different coefficients of thermal expansion compared to ceramic, can cause the ceramic protective plates to crack under compressive stress after heating, thus rendering the ceramic protective plates ineffective in protecting the front face of the tuyere sleeve assembly. Summary of the Invention

[0004] The purpose of this utility model is to provide a ceramic protective tuyere sleeve and a blast furnace tuyere device with mortise and tenon joint connection.

[0005] The first aspect of this utility model provides a ceramic protective vent sleeve with mortise and tenon joint connection, 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; wherein the front end of the base is provided with a first connecting portion; a protective member having an annular structure, the protective member being adapted to the front end face of the base, the protective member having a contacting surface in contact with the front end face of the base, the contacting surface being provided with a second connecting portion adapted to the first connecting portion; the second connecting portion and the first connecting portion are connected by a mortise and tenon structure, so that the protective member is installed on the front end of the base, thereby achieving the protective member covering the front end face of the base.

[0006] Furthermore, the first connecting portion is disposed on the front end face of the base, and the first connecting portion is arranged to be distributed at intervals along the circumference of the base. The first connecting portion is a protrusion or a recess, and the second connecting portion is a corresponding recess or protrusion.

[0007] Furthermore, the first connecting part is a protrusion, the outer peripheral edge of the protrusion is connected to the outer side wall of the base, and the protrusion extends forward along the axial direction of the base, and the first connecting part has a fan-shaped ring structure; the second connecting part is a corresponding recess; wherein, the first connecting part is embedded in the second connecting part to realize that the protective member is installed on the front end face of the base.

[0008] Furthermore, the vent sleeve also includes a positioning element, which is used to restrict the axial movement of the protective element along the base. The positioning element is disposed on the cross-section of the first connecting part and the cross-section of the second connecting part. The cross-section is a non-arc plane of the fan ring structure and extends radially along the fan ring structure.

[0009] Furthermore, a first semi-circular hole is provided on the cross-section of the first connecting part, and a second semi-circular hole is provided on the cross-section of the second connecting part. The first semi-circular hole and the second semi-circular hole constitute a circular hole, which is used to accommodate the positioning member.

[0010] Furthermore, there are two first connecting parts, which are symmetrically arranged about the axis of the base.

[0011] Furthermore, the protective component has a protruding protective plate on its mating surface. The protective plate is designed with an arc shape, and the inner arc surface of the protective plate is adapted to the outer side wall of the substrate. The protective plate extends towards the rear end of the substrate to cover the outer side wall of the substrate. The protective plate is located between the two second connecting parts.

[0012] Furthermore, the substrate is provided with a cooling chamber for heat exchange between the input coolant and the substrate; the rear end face of the substrate is provided with an inlet and an outlet, the inlet for inputting coolant and the outlet for outputting coolant, both of which are connected to the cooling chamber; wherein, the outlet is located near the top region of the substrate, and the inlet and the outlet are respectively located on both sides of the axis of the substrate, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the height of the outlet above the ground is higher than the height of the inlet above the ground.

[0013] Furthermore, the first connecting part is a threaded hole, which is connected to the fluid output end of the spray channel; the second connecting part is a protruding bushing, which is provided with an external thread that matches the threaded hole, and the protective component is provided with a through spray hole, which is connected to the fluid output end of the spray channel.

[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 utility model, the second connecting part and the first connecting part are connected by a mortise and tenon structure to make the protective part firmly connected to the base. The protective part can fit against the front end face of the base and cover the front end face of the base to protect the front end face of the base. Furthermore, the protective part is an integral structure, and there is no need to set corresponding limiting blocks or limiting rings on the outer periphery of the protective part. Therefore, it can prevent the protective part from being crushed by the compressive stress generated by the expansion of the limiting ring or limiting block after being heated. It can effectively protect the front end face of the base, reduce the risk of the base being damaged by furnace material abrasion and high temperature melting, and thus extend the service life of the tuyeres sleeve. Attached Figure Description

[0017] Figure 1 is a structural schematic diagram of the small air vent sleeve with ceramic protection combined with mortise and tenon connection according to the first embodiment of the present utility model;

[0018] Figure 2 is a left view of Figure 1;

[0019] Figure 3 is a schematic diagram of the structure of the substrate according to the second embodiment of the present invention;

[0020] Figure 4 is a structural schematic diagram of the protective component according to the third embodiment of the present utility model;

[0021] Figure 5 is a structural schematic diagram of the small air vent sleeve with ceramic protection combined with mortise and tenon connection according to the fourth embodiment of the present utility model;

[0022] Figure 6 is a structural schematic diagram of the protective component according to the fifth embodiment of the present utility model;

[0023] Figure label:

[0024] 11. Matrix; 12. Pulse channel; 13. First connecting part; 14. Protective component; 15. Second connecting part; 16. Positioning component; 17. Protective plate; 18. Inlet; 19. Outlet; 20. Pulse hole; 131. First semicircular hole; 151. Second semicircular hole. Detailed Implementation

[0025] 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.

[0026] The first aspect of this utility model provides a ceramic protective vent sleeve with a mortise and tenon joint connection, as shown in Figures 1-6, comprising: a base 11 and a protective component 14. The base 11 has a blowing channel 12 extending axially along the base 11, and the fluid output end of the blowing channel 12 is the front end of the base 11; wherein, the front end of the base 11 is provided with a first connecting portion 13; the protective component 14 is an annular structure, the protective component 14 is adapted to the front end face of the base 11, the protective component 14 has a contacting surface that contacts the front end face of the base 11, and the contacting surface is provided with a second connecting portion 15 adapted to the first connecting portion 13; the second connecting portion 15 and the first connecting portion 13 are connected by a mortise and tenon structure, so that the protective component 14 is installed on the front end of the base 11, thereby achieving the protective component 14 covering the front end face of the base 11.

[0027] Specifically, the base 11 can be configured as a truncated cone 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. A jetting channel 12 is provided at the center of the base 11. The jetting channel 12 is used to supply air to the furnace or inject auxiliary fuel or other fluids. The jetting channel 12 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 is transported in the jetting channel 12 from the rear end to the front end of the base 11 to deliver the fluid into the furnace. The base 11 can be made of pure copper, and the protective component 14 can be made of ceramic material. Specifically, it can include one or more of alumina, silicon nitride, silicon carbide, silicon nitride combined with silicon carbide, zirconium corundum, chromium corundum, and aluminum titanate-corundum. The ceramic protective component 14 is heat-resistant and wear-resistant. When the tuyeres sleeve is installed on the blast furnace wall, the front end of the base 11 extends into the blast furnace. Inside the furnace, the first connecting part 13 is, for example, a protrusion or a buckle, and the second connecting part 15 is, for example, a corresponding groove or slot. They are connected by a mortise and tenon structure to ensure a firm connection between the protective part 14 and the base 11. The protective part 14 can fit against and cover the front end face of the base 11 to protect the front end face of the base 11. The protective part 14 is designed as a ring structure with a through-hole 20 in the middle, which is connected to the blowing channel 12. The protective part 14 is an integral structure, and there is no need to set corresponding limiting blocks or limiting rings on the outer periphery of the protective part 14. Therefore, it can prevent the protective part 14 from being crushed by the compressive stress generated by the expansion of the limiting ring or limiting block after heating. The protective part 14 can effectively protect the front end face of the base 11, reduce the risk of damage to the base 11 due to furnace material wear and high temperature melting, and thus extend the service life of the tuyeres sleeve.

[0028] In some embodiments, the first connecting portion 13 is disposed on the front end face of the base 11, and the first connecting portion 13 is arranged to be distributed circumferentially around the base 11. The first connecting portion 13 is a protrusion or a recess, and the second connecting portion 15 is a corresponding recess or protrusion. Multiple first connecting portions 13 are provided and distributed circumferentially around the base 11. For example, the first connecting portion 13 is a protrusion, and the second connecting portion 15 is a corresponding recess; or, the first connecting portion 13 is a recess, and the second connecting portion 15 is a corresponding protrusion. The connecting portions are arranged circumferentially, and the protrusions are embedded in the corresponding recesses, which can achieve the connection and fixation between the protective member 14 and the base 11. The fit between the recess and the protrusion can be a clearance fit, so even if the expansion coefficients of the protective member 14 and the base 11 are different after heating, the protrusion can avoid squeezing the protective member 14. Furthermore, the fit between the recess and the protrusion can support the protective member 14, and the protective member 14 is less likely to fall downwards relative to the base 11.

[0029] In an exemplary embodiment, the first connecting portion 13 is a protrusion, the outer peripheral edge of which is connected to the outer side wall of the base 11, and the protrusion extends forward along the axial direction of the base 11. The first connecting portion 13 has a fan-shaped ring structure. The second connecting portion 15 is a corresponding recess. The first connecting portion 13 is embedded in the second connecting portion 15 to enable the protective member 14 to be installed on the front end face of the base 11. The first connecting part 13 is a protruding part of the fan-ring structure, and the outer peripheral edge of the protruding part is connected to the outer side wall of the base 11. Correspondingly, the second connecting part 15 is a recessed part of the fan-ring structure, and the outer peripheral edge of the recessed part is connected to the outer side wall of the protective member 14. The protruding part is embedded in the corresponding recessed part, and the first connecting part 13 supports the protective member 14, which can prevent the protective member 14 from detaching from the base 11. Furthermore, the size of the recessed part is set to be larger than that of the protruding part, so the outer arc surface of the fan-ring structure does not need to match each other. A sufficiently large gap can be formed between the protruding part and the recessed part. Therefore, even if the expansion coefficients of the protective member 14 and the base 11 are different after heating, the protruding part can avoid squeezing the protective member 14.

[0030] To prevent the protective member 14 from moving in the front-back direction and detaching from the base 11, in some embodiments, the vent sleeve further includes a positioning member 16, which is used to restrict the axial movement of the protective member 14 along the base 11. The positioning member 16 is disposed on the cross-section of the first connecting portion 13 and the cross-section of the second connecting portion 15. The cross-section is a non-arc plane of the fan ring structure and extends radially along the fan ring structure.

[0031] In an exemplary embodiment, a first semi-circular hole 131 is provided on the cross-section of the first connecting portion 13, and a second semi-circular hole 151 is provided on the cross-section of the second connecting portion 15. The first semi-circular hole 131 and the second semi-circular hole 151 constitute a circular hole, which is used to accommodate the positioning member 16. The depth of the circular hole is set to extend radially along the fan ring structure. The positioning member 16 is, for example, a pin. The pin is adapted to the circular hole and can be fitted with a clearance fit. The pin is inserted into the circular hole from the outer wall of the base along the radial direction of the fan ring structure, which can prevent the protective member 14 from moving in the front-back direction and causing it to detach from the base 11. The protrusion is embedded into the corresponding recess, and then each pin is inserted into the circular hole of the cross-section, which is convenient for installation.

[0032] In some embodiments, there are two first connecting parts 13, which are symmetrically arranged about the axis of the base 11. Specifically, when the tuyeres sleeve is installed on the blast furnace wall, the front end of the base 11 extends into the blast furnace, and the two first connecting parts 13 are symmetrically arranged about the axis of the base 11 on the left and right sides of the base 11.

[0033] In some embodiments, the protective member 14 has a protruding protective plate 17 on its mating surface. The protective plate 17 is designed with an arc shape, and the inner arc surface of the protective plate 17 is adapted to the outer side wall of the base 11. The protective plate 17 extends towards the rear end of the base 11 so as to cover the outer side wall of the base 11. The protective plate 17 is located between the two second connecting portions 15. Specifically, the protective plate 17 can be made of ceramic material. When the tuyer sleeve is installed on the blast furnace wall, 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, while the bottom area of ​​the base 11 is relatively less prone to wear. Therefore, when the protective part 14 is installed at the front end of the base 11, the protective plate 17 can cover the outer wall of the top area of ​​the base 11, and the protective plate 17 extends towards the rear end of the base 11. The length of the protective plate 17 can be set to cover the area in the furnace where slag and iron are easily dripped. When slag and iron drip, the protective plate 17 can protect the outer wall of the base 11, avoiding damage to the base 11 caused by long-term slag and iron dripping. This also reduces the risk of damage from furnace charge wear and high-temperature melting, and extends the service life of the tuyer sleeve.

[0034] In some embodiments, the substrate 11 is provided with a cooling chamber for heat exchange between the input coolant and the substrate 11; the rear end face of the substrate 11 is provided with an inlet 18 and an outlet 19, the inlet 18 for inputting coolant and the outlet 19 for outputting coolant, and both the inlet 18 and the outlet 19 are connected to the cooling chamber; wherein, the outlet 19 is located near the top region of the substrate 11, and the inlet 18 and the outlet 19 are respectively located on both sides of the axis of the substrate 11, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the height of the outlet 19 above the ground is higher than the height of the inlet 18 above the ground. Specifically, a guide vane can be installed in the cooling chamber to guide the flow of cooling water within it. When cooling water is introduced into the cooling chamber of the base 11 through inlet 18 and then discharged through outlet 19, continuous cooling of the base 11 can be achieved, extending the service life of the tuyer sleeve. When the tuyer sleeve is installed on the furnace wall of the smelting furnace, outlet 19 is located near the top of the base 11, and the height of outlet 19 above the ground is higher than that of inlet 18 above the ground. This allows the cooling chamber of the base 11 to be filled with cooling water, which is beneficial for cooling the base 11 and prevents gas residue from remaining when the cooling chamber is not filled with cooling water, which would cause the residual gas to expand due to heat and deform the base 11. Using outlet 19 as a reference, the first connecting part 13 can be respectively located on the left and right sides of the base 11.

[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 system is installed on the lower part of the blast furnace wall and distributed along the furnace perimeter. The injection channel 12 of the tuyere sleeve is used for supplying air or injecting auxiliary fuel and other fluids into the furnace. The injection channel 12 can be a conical hole that gradually increases in size from the front end to the rear end of the base 11. The fluid in the injection channel 12 is transported from the rear end to the front end of the base 11 to deliver the fluid into the furnace. The base 11 can be made of pure copper, and the protective part 14 can be made of ceramic material. Specifically, it can include one or more of alumina, silicon nitride, silicon carbide, silicon nitride combined with silicon carbide, zirconium corundum, chromium corundum, and aluminum titanate-corundum. The ceramic protective part 14 is heat-resistant and wear-resistant. When the tuyere sleeve is installed on the blast furnace wall, the front end of the base 11 extends into the blast furnace. The first connecting part 13 is, for example, a protrusion or a snap-fit, and the second connecting part... Part 15, for example, is a corresponding groove or slot, connected by a mortise and tenon structure to ensure a firm connection between the protective part 14 and the base 11; the protective part 14 can fit against and cover the front end face of the base 11 to protect the front end face of the base 11; and the protective part 14 is designed as a ring structure with a through nozzle 20 in the middle, which is connected to the blowing channel 12. The protective part 14 is an integral structure, and there is no need to set corresponding limiting blocks or limiting rings on the outer periphery of the protective part 14. Therefore, it can prevent the protective part 14 from being crushed by the compressive stress generated by the expansion of the limiting ring or limiting block after heating. It can effectively protect the front end face of the base 11, reduce the risk of damage to the base 11 due to furnace material wear and high temperature melting, and thus extend the service life of the tuyeres sleeve.

[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 ceramic protective sleeve with mortise and tenon joint connection for air vents, characterized in that, include: A substrate having a spray channel extending axially along the substrate, the fluid output end of the spray channel being the front end of the substrate; wherein the front end of the substrate is provided with a first connecting portion; a protective member having an annular structure, the protective member being adapted to the front end face of the substrate, the protective member having a contact surface that contacts the front end face of the substrate, the contact surface having a second connecting portion adapted to the first connecting portion; the second connecting portion and the first connecting portion being connected by a tenon and mortise structure, so that the protective member is installed on the front end of the substrate, thereby achieving the protective member covering the front end face of the substrate.

2. The air vent sleeve according to claim 1, characterized in that, The first connecting portion is arranged to be distributed circumferentially along the substrate, and the first connecting portion is a protrusion or a recess, and the second connecting portion is a corresponding recess or protrusion.

3. The air vent sleeve according to claim 2, characterized in that, The first connecting part is a protrusion, the outer peripheral edge of which is connected to the outer side wall of the base, and the protrusion extends forward along the axial direction of the base. The first connecting part has a fan-shaped ring structure. The second connecting part is a corresponding recess. The first connecting part is embedded in the second connecting part to enable the protective member to be installed on the front end face of the base.

4. The air vent sleeve according to claim 3, characterized in that, Also includes: A positioning element is provided to restrict the axial movement of the protective element along the base. The positioning element is disposed on the cross-section of the first connecting part and the cross-section of the second connecting part. The cross-section is a non-arc plane of the fan ring structure and extends radially along the fan ring structure.

5. The air vent sleeve according to claim 4, characterized in that, The first connecting part has a first semi-circular hole on its cross-section, and the second connecting part has a second semi-circular hole on its cross-section. The first semi-circular hole and the second semi-circular hole form a circular hole, which is used to accommodate the positioning member.

6. The air vent sleeve according to claim 4, characterized in that, There are two first connecting parts, and the two first connecting parts are symmetrically arranged about the axis of the base.

7. The air vent sleeve according to claim 6, characterized in that, The protective component has a protruding protective plate on its mating surface. The protective plate is designed with an arc shape. The inner arc surface of the protective plate is adapted to the outer side wall of the substrate, and the protective plate extends towards the rear end of the substrate to cover the outer side wall of the substrate. The protective plate is located between the two second connecting parts.

8. The air vent sleeve according to any one of claims 1-7, characterized in that, The substrate is provided with a cooling chamber for heat exchange between the input coolant and the substrate. The rear end face of the substrate 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. The outlet is located near the top of the substrate, and the inlet and the outlet are located on opposite sides of the axis of the substrate, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the height of the outlet above the ground is higher than the height of the inlet above the ground.

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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