Tuyere sleeve

Abstract

The utility model discloses a tuyere sleeve which comprises a body arranged in a smelting furnace and internally provided with a first channel; the taper sleeve is connected with the rear end of the body, and the taper sleeve is embedded into the furnace wall of the smelting furnace; the flange is fixedly connected with the rear end of the taper sleeve, and the flange is used for being connected with the outer side of the furnace wall of the smelting furnace; the spray pipe is arranged in the taper sleeve, the spray pipe is provided with a second channel, the two ends of the spray pipe are fixedly connected with the body and the flange respectively, the second channel communicates with the first channel to form a blowing channel, and the fluid output end of the blowing channel is the front end of the body. The taper sleeve is arranged between the body and the flange, and the mutual joints of the taper sleeve, the body and the flange are fixedly connected, so that the manufactured tuyere sleeve is of an integrated structure, the sealing effect of the integrated structure is better, few joints need to be sealed exist, and the risk of air leakage is reduced; and compared with a split structure, the integrated structure has fewer parts to be replaced, so that the time is saved, and the operation requirement of blast furnace maintenance can be better met.

Description

Technical Field

[0001] This utility model relates to the technical field of blast furnaces, and in particular to a tuyeres sleeve. 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] Tuyere sleeve assembly is an important component in blast furnace smelting production for supplying air or injecting auxiliary fuel into the furnace. It is generally divided into a large tuyere sleeve, a medium sleeve, and a small sleeve. The three sleeves are connected to form an air inlet channel. Therefore, traditional tuyere sleeve assembly generally relies on compression sealing at the connection of the three sleeves, which may lead to the risk of air leakage due to poor fit. Utility Model Content

[0004] An embodiment of this utility model provides a tuyer sleeve, comprising: a body disposed inside a smelting furnace, the body having a first channel; a conical sleeve connected to the rear end of the body, the conical sleeve being embedded in the furnace wall of the smelting furnace; a flange fixedly connected to the rear end of the conical sleeve, the flange being used to connect to the outer side of the furnace wall of the smelting furnace; and a nozzle disposed inside the conical sleeve, the nozzle having a second channel, the two ends of the nozzle being fixedly connected to the body and the flange respectively, and the second channel communicating with the first channel to form a spraying channel, the fluid output end of the spraying channel being the front end of the body.

[0005] Furthermore, the body has a cooling cavity, which is an annular groove extending along the axial direction of the body. The cooling cavity is used to introduce cooling water to cool the body. The diameter of the first channel is set to gradually decrease from the rear end to the front end along the axial direction of the body, and the diameter of the cooling cavity is set to gradually decrease from the rear end to the front end along the axial direction of the body.

[0006] Furthermore, the air vent sleeve also includes: a water inlet pipe, one end of which is connected to the cooling cavity, the water inlet pipe extending to the rear end of the body and passing through the flange, and the other end of the water inlet pipe protruding outside the flange; and a water outlet pipe installed on the flange; wherein, the conical sleeve has a cavity that is connected to the cooling cavity, and the water outlet pipe is connected to the cavity.

[0007] Furthermore, the main body includes a first housing and a second housing arranged coaxially from the inside out, and an end plate connected to the front end of the first housing and the second housing. The first housing, the end plate and the second housing are connected in sequence to form the cooling cavity. A first channel is provided inside the first housing. A flow guide is provided inside the cooling cavity. The flow guide includes a flow guide tube and a flow guide plate disposed on the outer wall of the flow guide tube. The flow guide plate is spirally disposed on the outer wall of the flow guide tube to form a spiral flow channel. The flow guide plate is in contact with the inner wall of the second housing.

[0008] Furthermore, a first transition sleeve is provided between the nozzle and the first housing, and the two ends of the first transition sleeve are welded and fixed to the nozzle and the first housing respectively; a second transition sleeve is provided between the conical sleeve and the second housing, and the two ends of the second transition sleeve are welded and fixed to the conical sleeve and the second housing respectively; wherein, both the first transition sleeve and the second transition sleeve include a steel layer.

[0009] Furthermore, the cooling chamber is provided with a first end cap and a second end cap. The front end of the guide pipe is connected to the first end cap, and the rear end of the guide pipe is connected to the second end cap. The inner and outer walls of the first end cap are in contact with the first housing and the second housing, respectively, and the inner and outer walls of the second end cap are in contact with the first transition sleeve and the second transition sleeve, respectively. A space is reserved between the first end cap and the end plate to form a cooling channel. The first end cap has a first opening and a second opening. The first opening is used to connect the guide pipe to the cooling channel, and the second opening is used to connect the cooling channel to the spiral channel. The water inlet pipe is fixedly connected to the second end cap and is connected to the guide pipe. The second end cap has a third opening, which is used to connect the spiral channel to the cavity inside the conical sleeve.

[0010] Furthermore, the tapered sleeve is configured to extend axially, and the outer diameter of the tapered sleeve is configured to gradually increase from the front end to the rear end.

[0011] Furthermore, the flange is provided with mounting holes spaced apart circumferentially, the mounting holes are axially penetrating the flange and extending radially outward along the flange until the mounting holes communicate with the edge of the flange.

[0012] Furthermore, the fluid input end of the nozzle is exposed outside the flange, and the axes of the second channel and the first channel form an angle with the axis of the flange, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the second channel and the first channel are inclined downward; wherein, the angle is set to 0-10 degrees.

[0013] Furthermore, the inlet pipe and the outlet pipe are located on opposite sides of the flange axis, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the outlet pipe is higher than the inlet pipe.

[0014] The above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0015] In this embodiment of the invention, the tuyeres sleeve is made into an integral structure by placing the conical sleeve between the body and the flange and fixing the connection between the three. When the tuyeres sleeve is installed on the furnace wall of the smelting furnace, the flange is located outside the furnace wall, the conical sleeve is embedded in the furnace wall, the body extends into the furnace, and the nozzle is located inside the conical sleeve. The body has a first channel, and the second channel in the nozzle is connected to the first channel to form a spray channel. The fluid in the spray channel is transported from the rear end to the front end of the tuyeres sleeve to deliver the fluid into the furnace. This integral structure has a better sealing effect, fewer connection points that need to be sealed, and reduces the risk of leakage. When replacing, the integral structure requires fewer parts to be replaced than the split structure, saving time and better meeting the operational requirements of blast furnace maintenance. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of an air vent sleeve according to one embodiment of the present utility model;

[0017] Figure 2 yes Figure 1 The left view.

[0018] Figure label:

[0019] 11. Body; 12. Conical sleeve; 13. Flange; 14. Nozzle; 15. Inlet pipe; 16. Outlet pipe; 17. Guide pipe; 18. Guide vane; 19. First transition sleeve; 20. Second transition sleeve; 21. First end cap; 22. Second end cap; 23. Mounting hole;

[0020] 111. First housing; 112. Second housing; 113. End plate. Detailed Implementation

[0021] 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.

[0022] An embodiment of this utility model provides an air vent sleeve, such as... Figure 1 and Figure 2As shown, the system includes: a body 11, a conical sleeve 12, a flange 13, and a nozzle 14. The body 11 is disposed inside the smelting furnace and has a first channel inside it. The conical sleeve 12 is connected to the rear end of the body 11 and is embedded in the furnace wall of the smelting furnace. The flange 13 is fixedly connected to the rear end of the conical sleeve 12 and is used to connect to the outside of the furnace wall of the smelting furnace. The nozzle 14 is disposed inside the conical sleeve 12 and has a second channel. Both ends of the nozzle 14 are fixedly connected to the body 11 and the flange 13, respectively, and the second channel communicates with the first channel to form a spray channel. The fluid output end of the spray channel is the front end of the body 11.

[0023] Specifically, when the tuyeres are installed on the furnace wall of the smelting furnace, the flange 13 is located on the outside of the furnace wall, the conical sleeve 12 is embedded in the furnace wall, the body 11 extends into the furnace, and the nozzle 14 is located inside the conical sleeve 12. The body 11 has a first channel, and the second channel in the nozzle 14 communicates with the first channel to form a spraying channel. The fluid in the spraying channel is transported from the rear end to the front end of the tuyeres to deliver fluid into the furnace. The spraying channel is used to supply air to the furnace or inject auxiliary fuel or other fluids. The body 11 is located in a high-temperature environment inside the furnace and can be made of pure copper to facilitate heat dissipation. The conical sleeve 12 can be made of carbon steel. The material is used for support. The cone sleeve 12 is located between the body 11 and the flange 13. For easy installation, the rear end of the cone sleeve 12 can be set as the large end and the front end as the small end. The diameter of the flange 13 is set to be larger than the diameter of the large end of the cone sleeve 12. In contrast to the traditional separate structures of the large, medium, and small sleeves of the tuyeres, the tuyeres sleeve provided in this embodiment is an integrated structure. The integrated structure has a better sealing effect, fewer connection points requiring sealing, and reduces the risk of air leakage. Replacement of the integrated structure requires fewer parts compared to the separate structure, saving time and better meeting the operational requirements of blast furnace maintenance. Furthermore, the integrated structure optimizes the spatial structure, occupying less space. This allows for the installation of more tuyeres sleeves along the circumference of the furnace wall, thereby enabling uniform air delivery or injection of auxiliary fuels and other fluids into the furnace.

[0024] In some embodiments, the body 11 has a cooling cavity, which is an annular groove extending along the axial direction of the body 11. The cooling cavity is used to introduce cooling water to cool the body 11. The diameter of the first channel is set to gradually decrease from the rear end to the front end along the axial direction of the body 11, and the diameter of the cooling cavity is set to gradually decrease from the rear end to the front end along the axial direction of the body 11. The cooling chamber starts from the rear end of the body 11 and extends forward along the axial direction of the body 11. Cooling water is introduced into the cooling chamber, and the cooling water exchanges heat with the body 11, which can realize heat dissipation and cooling of the body 11. The diameter of the first channel is set to gradually decrease from the rear end to the front end along the axial direction of the body 11, which helps the fluid acceleration to be more stable and reduces turbulence and energy loss. The diameter of the cooling chamber is set to gradually decrease from the rear end to the front end along the axial direction of the body 11. That is, when the tuyeres are installed on the furnace wall of the smelting furnace, the diameter of the annular groove gradually decreases from the rear end to the front end along the axial direction of the body 11, which is conducive to the return of cooling water to the conical sleeve 12.

[0025] In some embodiments, the air vent sleeve further includes: a water inlet pipe 15, one end of which is connected to the cooling cavity, the water inlet pipe 15 extending toward the rear end of the body 11 and passing through the flange 13, and the other end of the water inlet pipe 15 protruding outside the flange 13; and a water outlet pipe 16, which is installed on the flange 13; wherein, the conical sleeve 12 has a cavity that is connected to the cooling cavity, and the water outlet pipe 16 is connected to the cavity. When assembling and disassembling the vent sleeve, to facilitate water pipe connection, both the inlet pipe 15 and the outlet pipe 16 can be exposed outside the flange 13. External threads can be provided on the inlet pipe 15 and the outlet pipe 16 to achieve threaded connection with the main water pipe. Since the vent sleeve provided in this embodiment is an integrated vent sleeve, the integrated vent sleeve structure optimizes the spatial structure, making the internal cavity of the cone sleeve 12 larger. This allows for the use of larger diameter inlet pipes 15 and 16, increasing the cooling water flow rate and enhancing the cooling effect on the front-end body 11. The internal cavity of the cone sleeve 12 can be filled with cooling water, further optimizing the cooling effect on the cone sleeve 12. Among these features,

[0026] In some embodiments, the body 11 includes a first housing 111 and a second housing 112 arranged coaxially from the inside to the outside, and an end plate 113 connected to the front end of the first housing 111 and the second housing 112. The first housing 111, the end plate 113 and the second housing 112 are sequentially connected to form the cooling cavity. The first housing 111 is provided with a first channel. The cooling cavity is provided with a flow guide. The flow guide includes a flow guide pipe 17 and a flow guide plate 18 disposed on the outer wall of the flow guide pipe 17. The flow guide plate 18 is spirally disposed on the outer wall of the flow guide pipe 17 to form a spiral flow channel. The flow guide plate 18 is in contact with the inner wall of the second housing 112. Specifically, the guide pipe 17 can be located between the first housing 111 and the second housing 112. Cooling water can first enter the space between the first housing 111 and the guide pipe 17, and then enter the space between the guide pipe 17 and the second housing 112. The cooling water is guided out of the cooling chamber by the spiral flow channel formed by the guide plate 18. Therefore, by setting the guide in the cooling chamber, the flow path of the cooling water is extended, which is conducive to the heat exchange between the cooling water and the body 11 and improves the heat exchange efficiency between the cooling water and the body 11.

[0027] In some embodiments, a first transition sleeve 19 is provided between the nozzle 14 and the first housing 111. One end of the first transition sleeve 19 is welded and fixed to the first housing 111, and the other end of the first transition sleeve 19 is fixedly connected to the nozzle 14. A second transition sleeve 20 is provided between the conical sleeve 12 and the second housing 112. One end of the second transition sleeve 20 is welded and fixed to the second housing 112, and the other end of the second transition sleeve 20 is fixedly connected to the conical sleeve 12. Specifically, the body 11 is in a high-temperature environment inside the furnace and can be made of pure copper. The conical sleeve 12 and the nozzle 14 can be made of carbon steel. The connection between the copper and steel materials can be achieved by argon arc welding. Before welding, the two workpieces to be welded need to be heated. The first transition sleeve 19 and the second transition sleeve 20 can be made of carbon steel. The size of the first transition sleeve 19 is adapted to the first housing 111, and the size of the second transition sleeve 20 is adapted to the second housing 112. The axial length of the first transition sleeve 19 and the second transition sleeve 20 can be set to be relatively small. One end of the first transition sleeve 19 can be welded and fixed to the first housing 111, and one end of the second transition sleeve 20 can be welded and fixed to the second housing 112. This helps to control the heating temperature of the two workpieces to be welded, reduce the deformation caused by uneven heating temperature, and reduce the loss of heating energy, thus saving production costs. When the other end of the first transition sleeve 19 is welded to the nozzle 14 and the other end of the second transition sleeve 20 is welded to the cone sleeve 12, it is a welding between two steel parts, which does not require preheating. Therefore, it is convenient to manufacture and helps to improve production efficiency.

[0028] In some embodiments, the cooling chamber is provided with a first end cap 21 and a second end cap 22. The front end of the guide pipe 17 is connected to the first end cap 21, and the rear end of the guide pipe 17 is connected to the second end cap 22. The inner and outer walls of the first end cap 21 are in contact with the first housing 111 and the second housing 112, respectively. The inner and outer walls of the second end cap 22 are in contact with the first transition sleeve 19 and the second transition sleeve 20, respectively. A space is reserved between the first end cap 21 and the end plate 113 to form a cooling channel. The first end cap 21 has a first opening and a second opening. The first opening is used to connect the guide pipe 17 to the cooling channel, and the second opening is used to connect the cooling channel to the spiral channel. The water inlet pipe 15 is fixedly connected to the second end cap 22, and the water inlet pipe 15 is connected to the guide pipe 17. The second end cap 22 has a third opening, which is used to connect the spiral channel to the cavity inside the cone sleeve 12. Specifically, after the guide pipe 17 and the guide plate 18 are manufactured, the front end of the guide pipe 17 is welded to the first end cap 21, and the rear end of the guide pipe 17 is welded to the second end cap 22. The manufactured assembly is then inserted into the cooling chamber. The second end cap 22 is then welded firmly to the first housing 111 and the second housing 112 respectively. The water outlet end of the water inlet pipe 15 can be welded and fixed to the second end cap 22, and the water inlet pipe 15 is connected to the guide pipe 17. The cooling water input from the water inlet pipe 15 enters the guide pipe 17, enters the cooling channel at the front end through the first opening, enters the spiral channel through the second opening, and enters the cavity inside the cone sleeve 12 through the guide through the third opening, and then flows out through the water outlet pipe 16. Therefore, the flow path of the cooling water is extended, which is conducive to the heat exchange between the cooling water and the body 11, improves the heat exchange efficiency between the cooling water and the body 11, and allows the cavity inside the cone sleeve 12 to be filled with cooling water, which also optimizes the cooling effect on the cone sleeve 12, thereby improving the service life of the air vent sleeve.

[0029] In an exemplary embodiment, to facilitate the installation and removal of the vent sleeve, the conical sleeve 12 is designed to extend axially, and the outer diameter of the conical sleeve 12 is designed to gradually increase from the front end to the rear end. Similarly, the inner diameter of the conical sleeve 12 is also designed to gradually increase from the front end to the rear end. This increases the volume of the inner cavity of the conical sleeve 12, which can increase the diameter of the water inlet pipe 15, thereby increasing the flow rate of cooling water and enhancing the cooling effect on the front body 11. At the same time, the inner cavity of the conical sleeve 12 can be filled with cooling water, which is beneficial for cooling the conical sleeve 12.

[0030] In some embodiments, the inlet pipe 15 and the outlet pipe 16 are located on opposite sides of the axis of the flange 13, so that when the tuyeres sleeve is installed on the furnace wall of the smelting furnace, the outlet pipe 16 is higher than the inlet pipe 15. When the tuyeres sleeve is installed on the furnace wall of the smelting furnace, the outlet pipe 16 is higher than the inlet pipe 15, that is, the outlet pipe 16 is above the inlet pipe 15. This allows the cavity inside the cone sleeve 12 to be filled with cooling water, which is beneficial for cooling the cone sleeve 12 and the front body 11, and can prevent gas residue when the cavity inside the cone sleeve 12 is not filled with cooling water, which would cause the residual gas to expand due to heat and deform the cone sleeve 12.

[0031] In some embodiments, the fluid inlet end of the nozzle 14 protrudes outside the flange 13, and the axes of the second channel and the first channel form an angle with the axis of the flange 13, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the second channel and the first channel are inclined downwards; wherein, the included angle is set to 0-10 degrees. When the tuyeres are disassembled and assembled, in order to facilitate the connection of the nozzle 14, the fluid inlet end of the nozzle 14 protrudes outside the flange 13. When the tuyeres are installed on the furnace wall of the smelting furnace, the second channel and the first channel are set to be slightly inclined downwards, which is conducive to the fluid output through the injection channel being sprayed towards the center position inside the furnace.

[0032] In some embodiments, the flange 13 is provided with mounting holes 23 spaced circumferentially. The mounting holes 23 extend axially through the flange 13 and radially outward until they communicate with the edge of the flange 13. The mounting holes 23 can be used to install threaded fasteners to connect and fix the flange 13 to the furnace wall of the smelting furnace. The mounting holes 23 are elongated to adjust the installation position of the threaded fasteners.

[0033] 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. An air vent cover, characterized in that, include: The main body is located inside a smelting furnace, and a first channel is provided inside the main body; A conical sleeve is connected to the rear end of the main body and is embedded in the furnace wall of the smelting furnace. A flange, which is fixedly connected to the rear end of the tapered sleeve, is used to connect to the outer side of the furnace wall of the smelting furnace. The nozzle is disposed inside the conical sleeve. The nozzle has a second channel. The two ends of the nozzle are fixedly connected to the body and the flange, respectively. The second channel is connected to the first channel to form a spray channel. The fluid output end of the spray channel is the front end of the body.

2. The vent sleeve according to claim 1, characterized in that, The body has a cooling chamber, which is an annular groove extending along the axial direction of the body. The cooling chamber is used to circulate cooling water to cool the body. The diameter of the first channel is set to gradually decrease from the rear end to the front end of the body along the axial direction of the body, and the diameter of the cooling cavity is set to gradually decrease from the rear end to the front end of the body along the axial direction of the body.

3. The vent sleeve according to claim 2, characterized in that, Also includes: The water inlet pipe has one end connected to the cooling chamber, extends towards the rear end of the body and passes through the flange, and the other end of the water inlet pipe protrudes outside the flange. A water outlet pipe is installed on the flange; wherein, the conical sleeve has a cavity that communicates with the cooling chamber, and the water outlet pipe communicates with the cavity.

4. The vent sleeve according to claim 3, characterized in that, The main body includes a first shell and a second shell arranged coaxially from the inside to the outside, and an end plate connected to the front end of the first shell and the second shell. The first shell, the end plate and the second shell are connected in sequence to form the cooling cavity. A first channel is provided inside the first shell. The cooling cavity is provided with a flow guide, which includes a flow guide tube and a flow guide plate disposed on the outer wall of the flow guide tube. The flow guide plate is spirally disposed on the outer wall of the flow guide tube to form a spiral flow channel; wherein, the flow guide plate is in contact with the inner wall of the second housing.

5. The air vent sleeve according to claim 4, characterized in that, A first transition sleeve is provided between the nozzle and the first housing, and the two ends of the first transition sleeve are welded and fixed to the nozzle and the first housing, respectively. A second transition sleeve is provided between the conical sleeve and the second housing, and the two ends of the second transition sleeve are welded and fixed to the conical sleeve and the second housing, respectively; wherein, both the first transition sleeve and the second transition sleeve include a steel layer.

6. The vent sleeve according to claim 5, characterized in that, The cooling chamber is provided with a first end cover and a second end cover. The front end of the guide tube is connected to the first end cover, and the rear end of the guide tube is connected to the second end cover. The inner wall and outer wall of the first end cover are in contact with the first housing and the second housing, respectively. The inner wall and outer wall of the second end cover are in contact with the first transition sleeve and the second transition sleeve, respectively. A space is reserved between the first end cap and the end plate to form a cooling channel. The first end cap has a first opening and a second opening. The first opening is used to connect the guide pipe to the cooling channel, and the second opening is used to connect the cooling channel to the spiral channel. The water inlet pipe is fixedly connected to the second end cap, and the water inlet pipe is connected to the guide pipe; a third opening is provided on the second end cap, which is used to connect the spiral flow channel to the cavity inside the cone sleeve.

7. The vent sleeve according to claim 1, characterized in that, The tapered sleeve is designed to extend axially, and the outer diameter of the tapered sleeve is designed to gradually increase from the front end to the rear end.

8. The vent sleeve according to claim 1, characterized in that, The flange is provided with mounting holes spaced circumferentially, the mounting holes are axially connected to the flange and extend radially outward to connect with the edge of the flange.

9. The vent sleeve according to claim 3, characterized in that, The inlet pipe and the outlet pipe are located on opposite sides of the flange axis, so that when the tuyeres are installed on the furnace wall of the smelting furnace, the outlet pipe is higher than the inlet pipe.

10. The vent sleeve according to any one of claims 1-9, characterized in that, The fluid input end of the nozzle protrudes outside the flange, and the axes of the second channel and the first channel form an angle with the axis of the flange so that when the tuyeres are installed on the furnace wall of the smelting furnace, the second channel and the first channel are inclined downward; wherein, the included angle is set to 0-10 degrees.

Images