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 base body is provided with an assembling face and a pillow block, the assembling face is a joint where the tuyere medium sleeve is arranged on the base body in a sleeving mode, the pillow block is located at the rear end of the assembling face, and the pillow block is lower than the assembling face; and the anti-sinking device comprises a positioning block, the positioning block is installed at the plummer block, the two opposite side faces of the positioning block are supporting faces, and the supporting faces make contact with the plummer block and the inner wall of the tuyere middle sleeve respectively so as to support the base body. The plummer block is additionally arranged at the rear end of the assembling face of the base body to serve as a balance weight, and therefore sinking of the tuyere small sleeve can be restrained. The positioning block is arranged at the plummer block, and the supporting surface of the positioning block is in interference fit with the plummer block and the inner wall of the tuyere middle sleeve, so that the base body can be supported, and the front end of the base body can be prevented from sinking and deforming due to the impact of furnace charge descending.

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. During actual use, the tuyere sleeve assembly is prone to sinking and deformation due to the impact of descending furnace charge, affecting the air inlet angle and even causing air leakage at the mating surface between the assembly and the tuyere sleeve, creating safety hazards. Traditional protection methods involve adding a support rod to the lower end of the assembly, but this is prone to tipping over and is ineffective. Alternatively, lengthening the mating surface between the assembly and the tuyere sleeve can strengthen their grip, but an excessively long mating surface is difficult to manufacture and may lead to poor sealing. Utility Model Content

[0004] The purpose of this utility model is to provide a tuyere sleeve and a blast furnace tuyere device.

[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; the base having a mounting surface and a bearing platform, the mounting surface being the connection point where the air vent sleeve is fitted onto the base, the bearing platform being located at the rear end of the mounting surface and lower than the mounting surface; and an anti-sinking device comprising a positioning block installed at the bearing platform, the positioning block having two opposite sides serving as support surfaces, the support surfaces respectively contacting the bearing platform and the inner wall of the air vent sleeve to support the base.

[0006] Furthermore, the positioning block extends along the axial direction of the base, and the cross-sectional shape of the positioning block cut along its length direction is a rectangular structure or a trapezoidal structure; wherein, when the cross-sectional shape of the positioning block is a trapezoidal structure, the distance between the two supporting surfaces gradually decreases from the rear end to the front end along the axial direction of the base.

[0007] Furthermore, there is a reserved space between the inner wall of the shaft platform and the inner wall of the air vent sleeve, and the distance between the two supporting surfaces of the positioning block is greater than the distance of the reserved space.

[0008] Furthermore, the anti-sinking device also includes a fixing frame, which includes a fixing plate and two baffles arranged side by side and spaced apart. One side of the fixing plate is connected and fixed to the baffles, and the space between the two baffles forms a positioning groove. The fixing plate is connected to the rear end face of the base. The positioning groove extends along the axial direction of the base and is adapted to the positioning block. The two opposite sides of the positioning block that intersect with the support surface are guide surfaces. The guide surfaces contact the two baffles respectively to guide the positioning block.

[0009] Furthermore, the fixing plate is provided with a through mounting hole, and the rear end face of the base is provided with a threaded hole. The mounting hole and the threaded hole are adapted to each other. The threaded fastener is inserted into the mounting hole and screwed into the threaded hole to connect and fix the fixing frame to the base.

[0010] Furthermore, when the anti-sinking device is installed on the base, the height of the baffle is lower than that of the positioning block, the baffle is set to gradually tilt along the axial direction of the base, and the tilting slope of the baffle is adapted to the tilting slope of the shaft platform.

[0011] Furthermore, the anti-sinking device is disposed in the top region near the base, and the anti-sinking device is symmetrically arranged about the axis of the base.

[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 anti-sinking devices are symmetrically arranged on both sides of the outlet, and the included angle between the centers of the two symmetrically arranged anti-sinking devices is 50-120 degrees.

[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, a shaft platform is added as a counterweight at the rear end of the assembly surface of the base, which helps to suppress the sinking of the tuyer sleeve. A positioning block is set at the shaft platform, and the supporting surface of the positioning block forms an interference fit with the inner wall of the shaft platform and the tuyer sleeve, which can support the base and prevent the front end of the base from sinking and deforming due to the impact of the descending furnace charge. This ensures that the air inlet angle of the injection channel does not change, and the assembly surface of the base and the tuyer sleeve has good sealing performance, making it less prone to air leakage and providing a reliable guarantee for safe production operations. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the air vent sleeve according to the first embodiment of this utility model;

[0018] Figure 2 This is a structural schematic diagram of the air vent sleeve according to the second embodiment of the present utility model;

[0019] Figure 3 for Figure 2 The left view;

[0020] Figure 4 This is a structural schematic diagram of the anti-sinking device according to the third embodiment of this utility model;

[0021] Figure 5 This is a structural schematic diagram of the anti-sinking device according to the fourth embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the connection structure between the small air vent sleeve and the middle air vent sleeve according to the fifth embodiment of this utility model.

[0023] Figure label:

[0024] 11. Matrix; 12. Pulse channel; 13. Positioning block; 14. Fixing bracket; 15. Threaded fastener; 16. Inlet; 17. Outlet; 18. Positioning groove; 20. Air outlet sleeve;

[0025] 111, Shaft platform; 131, Support surface; 132, Guide surface; 141, Fixing plate; 142, Baffle. Detailed Implementation

[0026] 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.

[0027] The tuyere sleeve assembly is a crucial component in blast furnace smelting, responsible for supplying air or injecting auxiliary fuel. In actual use, the tuyere sleeve assembly is prone to sinking and deformation due to the impact of descending furnace charge, affecting the air inlet angle and even causing air leakage at the mating surface between the assembly and the tuyere sleeve, posing a safety hazard. Traditional protection methods involve adding a support rod to the lower end of the assembly, but this is prone to tipping over and is ineffective. Alternatively, lengthening the mating surface between the assembly and the tuyere sleeve can strengthen their grip, but an excessively long mating surface is difficult to manufacture and may lead to poor sealing.

[0028] Based on this, the first aspect of this utility model provides a small air vent sleeve, such as... Figure 1-6 As shown, the device includes a base 11 and an anti-sinking device. The base 11 is provided with a jetting channel 12, which extends axially along the base 11, and the fluid output end of the jetting channel 12 is the front end of the base 11. The base 11 has a mounting surface and a shaft platform 111. The mounting surface is the connection point where the air outlet sleeve 20 is fitted onto the base 11, and the shaft platform 111 is located at the rear end of the mounting surface and is lower than the mounting surface. The anti-sinking device includes a positioning block 13, which is installed at the shaft platform 111. The two opposite sides of the positioning block 13 are support surfaces 131, which contact the shaft platform 111 and the inner wall of the air outlet sleeve 20 respectively to support the base 11.

[0029] 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, and 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 in the jetting 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 positioning block 13 can be made of carbon steel, stainless steel, or other hard metal materials to withstand greater support forces. When the tuyere sleeve is installed on the blast furnace wall, the front end of the base 11 extends into the blast furnace, especially in large blast furnaces where the tuyere sleeve device is long and the tuyere is small. The sleeve extends a long length into the furnace. To balance the weight of the tuyer sleeve inside and outside the furnace, a shaft platform 111 is added at the rear end of the mounting surface of the tuyer sleeve as a counterweight, which helps to suppress the sinking of the tuyer sleeve. The shaft platform 111 is set lower than the mounting surface. The space between the shaft platform 111 and the inner wall of the tuyer sleeve 20 is used to accommodate the positioning block 13. The support surface 131 is, for example, the upper and lower sides of the positioning block 13. Preferably, when the support surface 131 forms an interference fit with the shaft platform 111 and the inner wall of the tuyer sleeve 20, it can support the base 11 and prevent the front end of the base 11 from sinking and deforming due to the impact of the falling furnace charge. This ensures that the air inlet angle of the injection channel does not change, and the mounting surface between the base and the tuyer sleeve has good sealing performance, making it less likely to leak air and providing a reliable guarantee for safe production operations.

[0030] In some embodiments, the positioning block 13 extends along the axial direction of the base 11, and the cross-sectional shape of the positioning block 13 cut along its length direction is a rectangular structure or a trapezoidal structure; wherein, when the cross-sectional shape of the positioning block 13 is a trapezoidal structure, the distance between the two supporting surfaces 131 gradually decreases from the rear end to the front end along the axial direction of the base 11. Specifically, the positioning block 13 can be a wedge structure with a cross-sectional shape of a right trapezoid or an isosceles trapezoid. For ease of installation, one side of the support surface 131 can be set as an inclined surface, or both sides of the support surface 131 can be set as inclined surfaces. Guided by the inclined surfaces, the positioning block 13 can be smoothly pushed into the space between the shaft platform 111 and the inner wall of the air outlet sleeve 20. As the positioning block 13 is gradually pushed in, it can adapt to the size of the space. The support surface 131 gradually contacts the shaft platform 111 and the inner wall of the air outlet sleeve 20, and finally achieves an interference fit. Therefore, even if there is a deviation in the space dimensions, the positioning block 13 can still play a supporting role. The cross-sectional shape of the positioning block 13 can also be rectangular, for example, so that the contact area between the support surface 131 and the shaft platform 111 and the inner wall of the air outlet sleeve 20 is larger, and the supporting force is greater.

[0031] In some embodiments, a reserved space exists between the shaft platform 111 and the inner wall of the air vent sleeve 20, and the distance between the two supporting surfaces 131 of the positioning block 13 is greater than the distance of the reserved space. When the cross-sectional shape of the positioning block 13 is trapezoidal, the size of the large end face of the positioning block 13 is 2-4 mm larger than the distance of the reserved space, and the size of the small end face of the positioning block 13 can be set to be 2-4 mm smaller than the distance of the reserved space; when the cross-sectional shape of the positioning block 13 is rectangular, the distance between the two supporting surfaces 131 of the positioning block 13 is 1-2 mm larger than the distance of the reserved space.

[0032] In some embodiments, the anti-sinking device further includes a fixing frame 14, which includes a fixing plate 141 and two baffles 142 arranged side by side and spaced apart. One side of the fixing plate 141 is connected and fixed to the baffles 142. The space between the two baffles 142 forms a positioning groove 18. The fixing plate 141 is connected to the rear end face of the base 11. The positioning groove 18 extends along the axial direction of the base 11. The positioning groove 18 is adapted to the positioning block 13. The two opposite sides of the positioning block 13 that intersect with the support surface 131 are guide surfaces 132. The guide surfaces 132 contact the two baffles 142 respectively to guide the positioning block 13. By setting a positioning groove 18 on the fixing frame 14, it is possible to avoid directly opening a recessed positioning groove 18 on the base 11, which would be more difficult to process and pose a risk of water leakage after processing. The width of the positioning groove 18 is 0.5-2mm larger than that of the positioning block 13. The two baffles 142 set at intervals can guide the insertion of the positioning block 13 and prevent the positioning block 13 from being inaccurate during assembly.

[0033] In some embodiments, the fixing plate 141 has a through mounting hole, and the rear end face of the base 11 has a threaded hole. The mounting hole and the threaded hole are adapted to each other. A threaded fastener 15 is inserted into the mounting hole and screwed into the threaded hole to connect and fix the fixing bracket 14 to the base 11. The threaded fastener 15 is, for example, a bolt. The fixing plate 141 and the base 11 are detachably connected by the threaded fastener 15. This facilitates the installation of the anti-sinking device and avoids more complex machining processes on the base 11, thus saving production costs.

[0034] In some embodiments, when the anti-sinking device is installed on the base 11, the height of the baffle 142 is lower than that of the positioning block 13, the baffle 142 is set to gradually tilt along the axial direction of the base 11, and the tilt slope of the baffle 142 is adapted to the tilt slope of the shaft platform 111. The bearing platform 111 is, for example, a truncated cone structure. The inclination slope of the baffle 142 is set to match the inclination slope of the bearing platform 111. In this way, the baffle 142 can fit against the surface of the bearing platform 111, increasing the friction with the bearing platform 111 and preventing deformation due to compression when the positioning block 13 is pushed into the positioning groove 18. The height of the baffle 142 is set lower than that of the positioning block 13, which is beneficial to the installation of the positioning block 13. In this embodiment, after the fixing frame 14 is installed on the base 11, the air vent sleeve 20 is fitted on the base 11. The air vent sleeve 20 is connected to the assembly surface of the base 11. Then, the positioning block 13 is gradually pushed into the positioning groove 18 so that the support surface 131 of the positioning block 13 is interference-fitted with the inner wall of the bearing platform 111 and the air vent sleeve 20 respectively. The rear end of the positioning block 13 can be exposed on the fixing plate 141. If the positioning block 13 is trapezoidal, the large end of the positioning block 13 is exposed on the fixing plate 141.

[0035] In some embodiments, the anti-sinking device is disposed near the top region of the base 11, and the anti-sinking device is symmetrically arranged about the axis of the base 11. When the tuyeres sleeve is installed on the blast furnace wall, the front end of the base 11 extends into the blast furnace. The front end of the base 11 is prone to sinking due to the impact of the descending furnace charge. If the anti-sinking device is installed near the top region of the base 11, and the anti-sinking device is symmetrically arranged about the axis of the base 11 within a certain angle range on the left and right sides of the base 11, the base 11 can be prevented from sinking due to the support of the two positioning blocks 13 on the left and right sides.

[0036] 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 16 and an outlet 17, the inlet 16 for inputting coolant and the outlet 17 for outputting coolant, and both the inlet 16 and the outlet 17 are connected to the cooling chamber; wherein, the outlet 17 is located near the top region of the substrate 11, and the inlet 16 and the outlet 17 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 17 above the ground is higher than the height of the inlet 16 above the ground. 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 substrate 11 through inlet 16 and then discharged through outlet 17, continuous cooling of the substrate 11 can be achieved, extending the service life of the tuyeres sleeve. When the tuyeres sleeve is installed on the furnace wall of the smelting furnace, the height of outlet 17 above the ground is higher than that of inlet 16, i.e., outlet 17 is located above inlet 16. This allows the cooling chamber of the substrate 11 to be filled with cooling water, which is beneficial for cooling the substrate 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 substrate 11.

[0037] In some embodiments, the anti-sinking devices are symmetrically arranged on both sides of the outlet 17, with the included angle between the centers of the two symmetrically arranged anti-sinking devices being 50-120 degrees. The outlet 17 is connected to the water outlet pipe. By symmetrically arranging the anti-sinking devices on both sides of the outlet 17, interference between the anti-sinking devices and the water outlet pipe can be avoided. The included angle between the centers of the two symmetrically arranged anti-sinking devices being 50-120 degrees, supported by the left and right positioning blocks 13 near the top area of ​​the base 11, makes it difficult for the base 11 to sink. Even if the front end of the base 11 is impacted by airflow from all directions inside the furnace, it is not easy to deform.

[0038] 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 middle tuyere sleeve 20 and a large tuyere sleeve; wherein the middle tuyere sleeve 20 is connected to the rear end of the small tuyere sleeve, and the large tuyere sleeve is connected to the rear end of the middle tuyere sleeve 20; 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 lower part of the blast furnace and distributed along the furnace perimeter. The injection channel 12 of the small tuyere sleeve is for supplying air into the furnace or injecting fluids such as auxiliary fuel. The front end of the base 11 extends into the blast furnace. Especially in large blast furnaces, the tuyere sleeve device is long, and the length of the small tuyere sleeve extending into the furnace is long. To balance the weight of the small tuyere sleeve inside and outside the furnace, a shaft platform 111 is added at the rear end of the mounting surface of the small tuyere sleeve as a counterweight, thereby helping to suppress the sinking of the small tuyere sleeve; the shaft platform 111 is set lower than the mounting surface, and the middle tuyere sleeve 20 is provided with mounting... The mounting hole and the enlarged hole are connected to the mounting hole. The mounting hole is adapted to the mounting surface of the base 11. The diameter of the enlarged hole can be slightly larger than the mounting hole. The space between the shaft platform 111 and the inner wall of the enlarged hole of the tuyer sleeve 20 is used to accommodate the positioning block 13. The support surface 131 is, for example, the upper and lower sides of the positioning block 13. Preferably, when the support surface 131 forms an interference fit with the inner wall of the shaft platform 111 and the tuyer sleeve 20 respectively, the base 11 can be supported, and the front end of the base 11 can be prevented from sinking and deforming due to the impact of the descending furnace charge. Figure 6 The arrows in the diagram indicate the direction in which the furnace charge falls.

[0039] 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: The substrate is provided with a jetting channel that extends along the axial direction of the substrate, and the fluid output end of the jetting channel is the front end of the substrate; The base has an assembly surface and a shaft platform. The assembly surface is the connection point where the air vent is sleeved on the base. The shaft platform is located at the rear end of the assembly surface and is lower than the assembly surface. An anti-sinking device includes a positioning block installed on a shaft platform. The two opposite sides of the positioning block are support surfaces, which contact the inner walls of the shaft platform and the air vent sleeve, respectively, to support the base.

2. The air vent sleeve according to claim 1, characterized in that, The positioning block extends along the axial direction of the base, and the cross-sectional shape of the positioning block cut along its length is a rectangular or trapezoidal structure; wherein... When the cross-sectional shape of the positioning block is a trapezoidal structure, the distance between the two supporting surfaces gradually decreases from the rear end to the front end along the axial direction of the base.

3. The air vent sleeve according to claim 2, characterized in that, There is a reserved space between the inner wall of the shaft platform and the air vent sleeve, and the distance between the two supporting surfaces of the positioning block is greater than the distance of the reserved space.

4. The air vent sleeve according to claim 1, characterized in that, The anti-sinking device also includes a fixing frame, which includes a fixing plate and two baffles arranged side by side and spaced apart. One side of the fixing plate is connected and fixed to the baffles, and the space between the two baffles forms a positioning groove. The fixing plate is connected to the rear end face of the base. The positioning groove extends along the axial direction of the base body and is adapted to the positioning block. The two opposite sides of the positioning block that intersect with the support surface are guide surfaces, which contact the two baffles respectively to guide the positioning block.

5. The air vent sleeve according to claim 4, characterized in that, The fixing plate has a through mounting hole, and the rear end face of the base has a threaded hole. The mounting hole and the threaded hole are adapted to each other. The threaded fastener is inserted into the mounting hole and screwed into the threaded hole to connect and fix the fixing frame to the base.

6. The air vent sleeve according to claim 4, characterized in that, When the anti-sinking device is installed on the base, the height of the baffle is lower than that of the positioning block, the baffle is set to gradually tilt along the axial direction of the base, and the tilt slope of the baffle is adapted to the tilt slope of the shaft platform.

7. The air vent sleeve according to claim 1, characterized in that, The anti-sinking device is located in the top region near the base, and the anti-sinking device is symmetrical about the axis of the base.

8. The air vent sleeve according to any one of claims 1-7, 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 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 area 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. The air vent sleeve according to claim 8, characterized in that, The anti-sinking devices are symmetrically arranged on both sides of the outlet, and the included angle between the centers of the two symmetrically arranged anti-sinking devices is 50-120 degrees.

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

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