Blast furnace tuyere small sleeve front cavity body and blast furnace tuyere small sleeve

Abstract

This application discloses a blast furnace tuyere sleeve front cavity body and tuyere sleeve. The front cavity body includes: an annular shell with an annular cooling cavity inside, the annular shell having a front end and a rear end opposite each other along the axial direction, and an inlet and an outlet communicating with the cooling cavity; a heat exchange enhancement member disposed in the cooling cavity, the first end of the heat exchange enhancement member being connected to the wall surface of the annular shell at the front end, and the second end extending towards the rear end along the axial direction of the annular shell; wherein the heat exchange enhancement member is provided with a turbulence-disrupting structure to disrupt the thermal boundary layer of the cooling water. This application forms a compact cooling space by enclosing the cooling cavity with the annular shell, the first end of the heat exchange enhancement member being directly connected to the wall surface of the annular shell at the front end, and the second end extending rearward, significantly increasing the heat exchange area of ​​the front end region; at the same time, the turbulence-disrupting structure on the heat exchange enhancement member effectively disrupts the thermal boundary layer of the cooling water, induces turbulence, and significantly improves heat exchange efficiency.

Description

Technical Field

[0001] This application relates to the technical field of blast furnace ironmaking equipment, and in particular to a blast furnace tuyere sleeve front cavity body and tuyere sleeve. Background Technology

[0002] The tuyere sleeve is one of the most critical thermal equipment in the blast furnace ironmaking system, and it operates in the harshest environment.

[0003] The front end of the tuyere sleeve is directly exposed to the hearth for extended periods, enduring high-temperature radiation exceeding 2000℃, intense scouring from coke and pulverized coal, and chemical erosion from molten slag and iron. Under these extreme conditions, the tuyere sleeve, especially its front cavity section, is highly susceptible to burn-out, cracking, and wear, leading to a shortened service life and becoming one of the main reasons restricting the continuous and stable operation of the blast furnace. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a blast furnace tuyere sleeve front cavity body and tuyere sleeve, which improves the heat exchange area of ​​the annular shell by setting a heat exchange enhancement component in the cooling cavity, and provides a turbulence structure in the heat exchange enhancement component to break the thermal boundary layer of the cooling water to improve the heat exchange efficiency.

[0005] In a first aspect, this application proposes a blast furnace tuyeres small sleeve front cavity body, comprising: The annular shell has an annular cooling cavity inside. The annular shell has a front end and a rear end that are opposite each other along the axial direction. The annular shell is provided with an inlet and an outlet that communicate with the cooling cavity. A heat exchange enhancement component is disposed in the cooling chamber. The first end of the heat exchange enhancement component is connected to the wall surface of the annular shell at the front end, and the second end extends along the axial direction of the annular shell towards the rear end to increase the heat exchange area of ​​the annular shell. The heat exchange enhancement component is equipped with a turbulence structure to disrupt the thermal boundary layer of the cooling water.

[0006] In some embodiments, at least a portion of the turbulence-inducing structure is disposed on the side of the heat exchange enhancement member facing the furnace top; or, The heat exchange enhancement component is arranged circumferentially along the cooling cavity, and the heat exchange enhancement component has a turbulence structure at a circumferential position of the annular shell.

[0007] In some embodiments, the heat exchange enhancement member includes an annular plate, which may be one or multiple annular plates arranged coaxially; The first end of the annular plate is connected to the front wall, and the second end extends toward the rear. The annular plate defines at least two annular flow channels radially distributed along the annular shell in the cooling chamber to guide the flow of cooling water. The annular plate is equipped with a turbulence-inducing structure.

[0008] In some embodiments, the turbulence structure includes turbulence holes penetrating the annular plate.

[0009] In some embodiments, the annular plate is provided with a plurality of spaced-apart turbulence holes.

[0010] In some embodiments, multiple annular plates are provided, and each annular plate is provided with a turbulence hole, and the turbulence holes on different annular plates correspond to each other radially along the annular shell.

[0011] In some embodiments, the turbulence hole is a tapered hole, the diameter of which tends to decrease along the radial direction of the annular shell from the inner sidewall to the outer sidewall of the annular shell, so as to direct the flow of cooling water through the turbulence hole.

[0012] In some embodiments, the width of the annular flow channel near the inner peripheral sidewall of the annular housing is greater than the width of the annular flow channel near the outer peripheral sidewall of the annular housing.

[0013] In some embodiments, the height of the heat exchange enhancement member along the axial direction of the annular shell is less than the depth of the cooling cavity along the axial direction of the annular shell.

[0014] Secondly, this application provides a blast furnace tuyere sleeve, comprising: the front cavity body of the blast furnace tuyere sleeve as proposed in the first aspect; and, The rear cavity body is located at the rear end of the annular shell. The rear cavity body has a rear cavity cooling cavity inside, and the rear cavity body is provided with a rear cavity water inlet and a rear cavity water outlet that communicate with the rear cavity cooling cavity. The rear cavity cooling cavity and the cooling cavity are isolated from each other.

[0015] Compared with existing technologies, this invention forms a compact cooling space by enclosing a cooling cavity with an annular shell. The first end of the heat exchange enhancement component is directly connected to the front wall of the annular shell, while the second end extends rearward, significantly increasing the heat exchange area in the front region. Simultaneously, the turbulence-inducing structure on the heat exchange enhancement component effectively disrupts the cooling water-thermal boundary layer, inducing turbulence. Through the synergistic effect of these structures, precise and efficient cooling of the high-temperature zone at the front of the vent sleeve is achieved, significantly improving heat exchange efficiency, effectively preventing overheating damage to the front cavity, and thus greatly extending the service life of the vent sleeve. Attached Figure Description

[0016] Figure 1 One of the schematic diagrams of the internal structure of the front cavity body of the air vent sleeve provided in the embodiments of this application; Figure 2 A second schematic diagram of the internal structure of the front cavity of the air vent sleeve provided in an embodiment of this application; Figure 3 This is a schematic diagram of the overall structure of the front cavity body of the air vent sleeve provided in the embodiment of this application.

[0017] Figure label: 10. Annular shell; 11. Cooling chamber; 12. Water inlet; 13. Water outlet; 14. Partition plate; 20. Heat exchange enhancement component; 21. Turbulence structure; 30. Annular flow channel; 40. Inlet pipe; 50. Outlet pipe. Detailed Implementation

[0018] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0019] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0020] In actual production, it has been found that the failure of the tuyer sleeve usually begins in the front-end structure. Due to high-temperature radiation, intense scouring from coke and coal dust, and the chemical erosion of molten slag and iron, the front end of the tuyer sleeve experiences high local temperatures. To prevent excessively high local temperatures from damaging the tuyer sleeve structure, cooling water is used to flow through the front cavity of the tuyer sleeve to achieve heat exchange and cooling. However, common tuyer sleeve cooling structures are relatively simple. Most designs employ a direct-flow cooling method with a single cavity or a simple annular water channel within the copper sleeve. This type of structure has significant drawbacks: First, its cooling heat exchange area is limited, resulting in insufficient cooling capacity; second, the simple flow channel design easily leads to uneven water distribution, causing local heat accumulation and cooling failure; finally, the cooling water flow is mainly laminar or weakly turbulent, which has a weak ability to disrupt the relatively static thermal boundary layer on the high-temperature wall surface, resulting in low heat exchange efficiency. Especially when the cooling water flows through the heat exchange surface of the front cavity body, a stable thermal boundary layer easily forms, resulting in high thermal resistance at the bottom layer and poor cooling effect.

[0021] To address the aforementioned issues, this disclosure proposes a blast furnace tuyere sleeve front cavity body and tuyere sleeve, which enhances the heat exchange effect by disrupting the thermal boundary layer effect within the front cavity and increasing the heat exchange area, thereby extending the service life of the tuyere sleeve.

[0022] like Figures 1-3 As shown, in a first aspect, this application proposes a blast furnace tuyere small sleeve front cavity body, comprising: The annular housing 10 has an annular cooling chamber 11 inside. The annular housing 10 has a front end and a rear end that are opposite each other along the axial direction. The annular housing 10 is provided with an inlet 12 and an outlet 13 that communicate with the cooling chamber 11. A heat exchange enhancement component 20 is disposed in the cooling chamber 11. The first end of the heat exchange enhancement component 20 is connected to the wall surface of the annular shell 10 at the front end, and the second end extends along the axial direction of the annular shell 10 toward the rear end to increase the heat exchange area of ​​the annular shell 10. The heat exchange enhancement component 20 is provided with a turbulence structure 21 to disrupt the thermal boundary layer of the cooling water.

[0023] Understandably, the annular shell 10 serves as the main structure of the front cavity body. In actual operation, it extends into the hearth. The middle of the annular shell 10 is hollowed out to form an air inlet channel. Hot air is blown into the blast furnace from the rear end to the front end of the annular shell within the air inlet channel.

[0024] The front end refers to the working section of the blast furnace tuyere sleeve front cavity body facing the inside of the blast furnace in the use state, and the rear end is set opposite to the front end, and the rear end is used to connect with the rear cavity of the tuyere sleeve.

[0025] The annular shell 10 is provided with an inlet 12 and an outlet 13 that communicate with the cooling chamber 11, so as to introduce low-temperature cooling water to remove heat and thus cool the annular shell 10. Both the inlet 12 and the outlet 13 can be set on the rear wall, so that the cooling water enters the cooling chamber from the inlet, fills the cooling chamber, and then flows out from the outlet, which is also set on the rear wall, to avoid the existence of cooling dead zones.

[0026] The heat exchange enhancement component 20 is disposed in the annular cooling cavity 11. The heat exchange enhancement component 20 has a first end and a second end disposed opposite to each other along the axial direction of the annular shell 10. The first end is fixedly connected to the wall surface of the front end of the annular shell 10. The heat exchange enhancement component 20 is disposed on the front end wall surface of the annular shell 10. The wall surface refers to the inner wall of the front end surface extending into the furnace hearth. The second end extends in the rear direction along the axial direction of the annular shell 10.

[0027] The heat exchange enhancement component 20 is made of a metal with good thermal conductivity, such as high-purity copper. The heat exchange enhancement component 20 is disposed within the cooling chamber 11, acting as heat dissipation fins or ribs. It can conduct the heat received by the heat exchange shell to the cooling water flow, preventing localized heat accumulation. Furthermore, it increases the contact area between the cooling water and the annular shell 10, thereby increasing the heat exchange area and improving heat exchange efficiency.

[0028] A turbulence-disrupting structure 21 is disposed on the heat exchange enhancement member 20 to disrupt the thermal boundary layer. The turbulence-disrupting structure 21 can be a raised rib, a recessed pit, an interlaced cylinder, or a turbulence-disrupting hole penetrating the heat exchange enhancement member 20.

[0029] When cooling water flows over the surface of the heat exchange enhancement component 20, the turbulence structure 21 set on it will change the flow direction and velocity of the water flow, causing the water flow to become turbulent. The turbulence can significantly weaken or even destroy the thermal boundary layer close to the annular shell 10 and the heat exchange enhancement component 20, so that the cooling water can come into more full contact with the surfaces of the two and exchange heat, thereby greatly improving the heat exchange efficiency.

[0030] The heat exchange enhancement component can be an annular plate arranged circumferentially along the cooling cavity 11 and coaxially with the annular shell 10. Alternatively, the heat exchange enhancement component can be multiple flat or arc-shaped plate structures arranged circumferentially at intervals along the cooling cavity 11, arranged in a circular array on the front wall. The heat exchange enhancement component 20 rapidly dissipates heat from the front end, and the turbulence structure 21 on the heat exchange enhancement component disrupts the thermal boundary layer, thereby reducing the local temperature of the front cavity body, delaying melting loss, and extending service life.

[0031] The turbulence structure 21 can be a column set on the surface of the annular plate and arranged radially along the annular shell, or it can be a turbulence hole penetrating the annular plate.

[0032] In summary, this invention forms a compact cooling space by enclosing a cooling cavity 11 with an annular shell 10. The first end of the heat exchange enhancement component 20 is directly connected to the front wall of the annular shell 10, and the second end extends rearward, significantly increasing the heat exchange area of ​​the front region. Simultaneously, the turbulence-inducing structure 21 on the heat exchange enhancement component 20 effectively disrupts the cooling water-thermal boundary layer, inducing turbulence. Through the synergistic effect of these structures, precise and efficient cooling of the high-temperature front region is achieved, significantly improving heat exchange efficiency, effectively preventing overheating damage to the front cavity, and thus greatly extending the service life of the vent sleeve.

[0033] In some embodiments, such as Figure 1 As shown, at least a portion of the turbulence-inducing structure 21 is disposed on the side of the heat exchange enhancement member 20 facing the furnace top; or, The heat exchange enhancement component 20 is arranged circumferentially along the cooling cavity 11, and the heat exchange enhancement component 20 has a turbulence structure 21 at a circumferential position of the annular shell 10.

[0034] Understandably, in actual production, due to gravity, liquid slag and iron will flow downwards, while pulverized coal and oxygen-rich high-temperature gas injected into the blast furnace through the tuyeres will flow upwards. This results in the upper edge (furnace top side) of the front cavity of the tuyeres being the area with the highest heat load and the most susceptible to melting. Therefore, in this embodiment, at least part of the turbulence structure 21 is provided on the side of the heat exchange enhancement member 20 facing the furnace top.

[0035] By setting the turbulence structure 21 only on the side of the heat exchange enhancement component 20 facing the furnace top, the cost and processing difficulty of the workpiece can be reduced.

[0036] Similarly, the heat exchange enhancement component 20 is arranged circumferentially along the cooling cavity 11. It can be multiple independent fins distributed circumferentially, or segmented guide plates, with turbulence structures 21 only set on a few fins or guide plates facing the furnace top.

[0037] For example, the heat-strengthening element consists of a plurality of fins that are uniformly distributed circumferentially within the cooling cavity 11 and extend axially along the annular shell 10. Among these fins, the fins facing the furnace top have grooves or raised turbulence-inducing surfaces, while the remaining fin surfaces are smooth.

[0038] It should be noted that the axial direction of the front cavity body is perpendicular to the height direction of the blast furnace. The axial direction of the front cavity body refers to the direction of the central axis of the tuyeres sleeve, that is, the direction in which hot air or pulverized coal is injected into the hearth; the height direction of the blast furnace refers to the direction from the bottom of the furnace to the top of the furnace.

[0039] In some embodiments, such as Figure 1 As shown, the heat exchange enhancement component 20 includes an annular plate, which may be one or multiple annular plates arranged coaxially; The first end of the annular plate is connected to the front wall, and the second end extends toward the rear. The annular plate defines at least two annular flow channels 30 radially distributed along the annular shell 10 within the cooling chamber 11 to guide the flow of cooling water. The annular plate is equipped with a turbulence structure 21.

[0040] Understandably, the heat exchange enhancement component 20 is an annular plate, which is set inside the cooling cavity 11. The first end is fixedly connected to the front wall of the annular shell 10, which is most susceptible to heat, and the second end extends towards the rear end. The first end is fixedly connected, while the second end is suspended. The inner and outer walls of the annular plate are spaced apart from the inner wall of the annular shell 10. The fact that the annular plate extends from the front end to the rear end is equivalent to adding multiple reinforcing ribs inside the annular shell 10, which significantly improves the overall deformation resistance of the air outlet sleeve, enabling it to withstand higher wind pressure and thermal stress. The annular plate can be set as one or multiple coaxially. When there are multiple annular plates, they are arranged in sequence along the radial direction (i.e., from the inner wall of the small sleeve to the outer wall) in the cooling cavity 11. The annular plates divide the annular cooling cavity 11 into at least two radially distributed annular flow channels 30. Taking the arrangement of two annular plates as an example, three annular flow channels 30 are formed within the cooling cavity 11, radially distributed from the inside out, and can be respectively regarded as the inner flow channel, the middle flow channel, and the outer flow channel. The multiple annular plates can be evenly spaced to ensure that the resulting multiple annular flow channels 30 have the same width, or the multiple annular plates can be unequally spaced to ensure that the resulting multiple annular flow channels 30 have different widths.

[0041] Since the second end of the annular plate is suspended and not connected to the rear wall of the annular shell 10, cooling water can be simultaneously poured into different flow channels from the inlet 12. The annular flow channel 30 serves to guide and divert the cooling water, which eventually converges at the outlet 13. With the total flow rate remaining constant, a decrease in the flow area increases the flow velocity. By setting the annular plate to compress the originally wide cooling chamber 11 into a narrow slit, the cooling water flow velocity will be significantly increased, and it can also flush the wall surface and prevent air bubbles from accumulating.

[0042] The annular plate, as a heat exchange enhancement component 20, increases the heat exchange area and adds a turbulence structure 21 to further enhance the heat transfer effect.

[0043] When high-speed water flows within a narrow annular channel 30, it already tends towards a turbulent state. At this time, setting protrusions, pits, or through holes on the surface of the annular plate can effectively break the velocity boundary layer and thermal boundary layer that may form within the channel.

[0044] The turbulence structure 21 generates local eddies in the main flow, which allows the heated water near the annular plate to mix fully with the cold water in the center of the flow channel, making the temperature of the entire flow channel cross section more uniform, thereby improving the heat exchange efficiency.

[0045] In some embodiments, such as Figure 1 As shown, the turbulence structure 21 includes turbulence holes that penetrate the annular plate.

[0046] Understandably, an annular plate or two or three annular plates of different diameters can be set in the cooling chamber 11. The first end of the annular plate is fixed to the front wall of the annular shell 10, and the second end is suspended freely, which defines at least two flow channels in the cooling chamber 11. The annular plate is provided with a turbulence hole that passes through it. The turbulence hole serves as a turbulence structure 21. While the water flows along the annular plate, a portion of the water will pass through the hole and be sprayed into the adjacent flow channel, forming a jet impact that forcibly cools the wall. When the cooling water flows through the edge of the turbulence hole, a local velocity change will occur, which will destroy the flow boundary layer on the surface of the annular plate and achieve a turbulence effect.

[0047] In some embodiments, the annular plate is provided with a plurality of spaced-apart turbulence holes.

[0048] Understandably, the annular plate is provided with multiple turbulence holes, which can be arranged at intervals along the circumference and / or axial direction of the annular plate. When multiple turbulence holes are arranged at intervals on the annular plate, they can form a jet array, and each turbulence hole will spray a jet of cooling water into the adjacent flow channel.

[0049] The turbulence hole can be a cylindrical hole or a conical hole.

[0050] In some embodiments, multiple annular plates are provided, and each annular plate is provided with a turbulence hole, and the turbulence holes on different annular plates correspond to each other radially along the annular shell.

[0051] Understandably, the radial correspondence of the turbulence holes on different annular plates along the annular shell means that the turbulence holes on different annular plates are located at approximately the same angular and axial positions in the direction radiating outward from the central axis of the annular shell 10. For example, if a line is drawn along the radius of the annular shell 10, the line will pass through the turbulence holes on multiple annular plates in sequence.

[0052] The location of the turbulence holes on the annular plate is in the part of the annular plate facing the furnace top, and the opening range corresponds to one-quarter or one-third of the annular plate.

[0053] The turbulence holes on the annular plate are radially aligned, forming a channel that runs through multiple flow channels. The turbulence hole structure and the pressure difference between different flow channels can be used to direct the flow of a small portion of cooling water between adjacent flow channels.

[0054] For example, the pressure in the inner channel is higher and the pressure in the outer channel is lower. Driven by the pressure, the cooling water will flow from the innermost channel to the outermost channel along this turbulence channel that runs through multiple channels.

[0055] In some embodiments, the turbulence hole is a tapered hole, and the diameter of the tapered hole tends to decrease in the radial direction of the annular housing 10 from the inner sidewall to the outer sidewall of the annular housing 10, so as to direct the flow of cooling water through the turbulence hole.

[0056] Understandably, the turbulence hole is a tapered through hole, and the diameter of the hole decreases radially from the inner wall of the annular shell 10 to the outer wall of the annular shell 10, so that the turbulence hole has the functions of unidirectional flow guidance and jet acceleration. It should be noted that the annular plate has a certain thickness, and the thickness direction is the radial direction of the annular shell 10.

[0057] The opening of the turbulence orifice is larger on the side closer to the inner annular flow channel 30 and smaller on the side closer to the outer annular flow channel 30. When some of the cooling water in the annular flow channel 30 flows from the inner flow channel to the outer annular flow channel 30 through the turbulence orifice, the turbulence orifice is in the state of a reduced nozzle. The cooling water is accelerated after passing through the turbulence orifice, which makes the flow smooth and suppresses possible reverse flow. The accelerated cooling water can be sprayed from the inner annular flow channel 30 to the outer annular flow channel 30 to achieve the turbulence effect.

[0058] In some embodiments, the width of the annular flow channel 30 near the inner peripheral sidewall of the annular housing 10 is greater than the width of the annular flow channel 30 near the outer peripheral sidewall of the annular housing 10.

[0059] Understandably, when the heat exchange enhancement component is at least one annular plate, the cooling cavity 11 defines at least two annular flow channels 30. The radial width of the two annular flow channels 30 is set such that the width of the annular flow channel 30 near the inner peripheral sidewall of the annular shell 10 (inner annular flow channel 30) is greater than the width of the annular flow channel 30 near the outer peripheral sidewall of the annular shell 10 (outer annular flow channel 30). That is, radially, from the inside to the outside, the multiple annular flow channels 30 become narrower.

[0060] The inner annular flow channel 30 has a large flow area and low friction resistance, resulting in slow pressure loss and maintaining a high static pressure in the inner flow channel.

[0061] The outer annular flow channel 30 has a small flow area, high frictional resistance, and rapid pressure loss. The pressure drop in the outer flow channel is more significant. The pressure in the inner annular flow channel 30 is higher than that in the outer annular flow channel 30, forming a stable pressure difference from the inside to the outside, which drives the cooling water to be sprayed directionally from the inside to the outside through the turbulence holes.

[0062] Combined with the conical orifice, it achieves dual acceleration and enhances the turbulence effect. When the cooling water flows through the turbulence orifice, the orifice diameter narrows, resulting in initial acceleration and jet formation. After the jet enters the relatively narrow annular channel 30 on the outside, the internal velocity is high due to the narrow channel. The jet merges with the high-speed mainstream, further enhancing the local turbulence intensity.

[0063] In some embodiments, such as Figure 2 As shown, the height of the heat exchange enhancement member 20 along the axial direction of the annular shell 10 is less than the depth of the cooling cavity 11 along the axial direction of the annular shell 10.

[0064] Understandably, the first end of the heat exchange enhancement component 20 is fixed and the second end is suspended. The height of the heat exchange enhancement component 20 is one-half or one-third of the depth of the cooling cavity 11. When the heat exchange enhancement component 20 is an annular plate, there is a gap between the rear end of the annular plate and the rear end wall of the annular shell 10. The annular flow channel 30 defined by the annular plate plays the role of guiding the cooling water to flow in the cooling cavity 11.

[0065] In some embodiments, such as Figure 1 and Figure 3 As shown, the annular housing 10 further includes a partition plate 14, which is disposed radially within the cooling cavity 11 of the annular housing 10; There are two inlets 12 and one outlet 13. Both inlets 12 and outlet 13 are located on the rear wall. Two inlets 12 are distributed on both sides of the partition plate 14 along the circumference of the annular shell 10, and the outlet 13 is symmetrically arranged with the partition plate 14 along the central axis of the annular shell 10 to shorten the flow path of the cooling water.

[0066] Understandably, the partition plate 14 extends from the inner peripheral sidewall of the annular housing 10 to the outer peripheral sidewall to separate the originally connected annular cooling chamber 11. There are two water inlets 12, both of which are opened on the rear wall of the annular shell 10, and the two water inlets 12 are distributed on both sides of the partition plate 14 along the circumference of the annular shell 10. The outlet 13 is set as one and opened on the rear wall of the annular shell 10. The position of the outlet 13 is symmetrical with the partition plate 14 along the central axis of the annular shell 10. The partition plate and the outlet are spaced apart and opposite to each other in the horizontal direction. The plate body of the partition plate 14 is also arranged horizontally in the annular shell 10, and the line connecting the partition plate 14 and the outlet 13 is perpendicular to the height direction of the blast furnace.

[0067] Due to the presence of the partition plate 14, the cooling water entering from the inlet 12 only needs to flow half a circumference to reach the outlet 13 at the symmetrical position, reducing the original flow path of the cooling water by half. This significantly reduces friction loss and makes the flow smoother. Although the path length is only half a circumference, it still covers the front and side walls of the entire half-section, ensuring comprehensive cooling. Furthermore, the cooling water only flows briefly within the cooling chamber 11, ensuring a lower temperature and thus better heat exchange.

[0068] In some embodiments, such as Figures 1-3 As shown, it also includes two water inlet pipes 40, which are connected to two water inlets 12 respectively, and the diameter of the water inlet pipes 40 decreases along the direction of cooling water flow. Water outlet pipe 50 is connected to water outlet 13.

[0069] Understandably, the diameter of the inlets 12 of the two inlet pipes 40 decreases along the flow direction of the cooling water. With a constant flow rate, the reduced flow area leads to an increased flow velocity. This forces the cooling water to accelerate as it flows through the narrowing inlets, resulting in a significantly higher velocity at inlet 12 than when it enters the inlet pipes 40. The high-speed water flow directly injects into the annular channel 30 within the cooling chamber 11, providing initial momentum for subsequent flow and heat exchange, and enabling rapid distribution within the annular channel 30.

[0070] Secondly, this application provides a blast furnace tuyere sleeve, comprising: the front cavity body of the blast furnace tuyere sleeve as proposed in the first aspect; and, The rear cavity body is located at the rear end of the annular shell. The rear cavity body has a rear cavity cooling cavity inside, and the rear cavity body is provided with a rear cavity water inlet and a rear cavity water outlet that communicate with the rear cavity cooling cavity. The rear cavity cooling cavity and the cooling cavity are isolated from each other.

[0071] Understandably, the blast furnace tuyeres adopt a dual-cavity structure combining the front cavity body and the rear cavity body. The two are independent of each other and not connected, and have an independent cooling water circulation system. Along the direction of hot air flow, the front cavity body is located at the front end and the rear cavity body is located at the rear end. Compared to the front cavity body, the rear cavity body is farther away from the hearth.

[0072] The rear cavity body and the front cavity body can be connected by welding or by bolts or flange structure to form a whole, and the materials can be thermally conductive metals such as copper to ensure good heat conduction at the connection and avoid local overheating.

[0073] It should be noted that the inlet and outlet pipes located at the rear end of the annular shell of the front cavity body need to avoid the rear cavity body.

[0074] The rear end of the rear cavity body can be connected to the air vent sleeve. The connection method can be a flange connection for easy disassembly.

[0075] The rear cavity can be cooled independently. Cooling water enters the rear cooling chamber and flows through the wall adjacent to the rear end of the front cavity, thereby carrying away the heat conducted by the front cavity and enhancing the cooling effect. Furthermore, even if the front cavity is damaged, the rear cavity can continue cooling, allowing the vent sleeve to maintain its cooling function for a period of time.

[0076] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0077] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0078] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A body for the front cavity of a blast furnace tuyere sleeve, characterized in that, include: An annular shell has an annular cooling cavity inside. The annular shell has a front end and a rear end that are opposite each other along the axial direction. The annular shell is provided with an inlet and an outlet that communicate with the cooling cavity. A heat exchange enhancement component is disposed in the cooling cavity. The first end of the heat exchange enhancement component is connected to the wall surface of the annular shell at the front end, and the second end extends along the axial direction of the annular shell toward the rear end to increase the heat exchange area of ​​the annular shell. The heat exchange enhancement component is provided with a turbulence structure to disrupt the thermal boundary layer of the cooling water.

2. The blast furnace tuyeres small sleeve front cavity body according to claim 1, characterized in that, At least a portion of the turbulence-inducing structure is located on the side of the heat exchange enhancement member facing the furnace top; or, The heat exchange enhancement component is arranged circumferentially along the cooling cavity, and the heat exchange enhancement component is provided with the turbulence structure at a circumferential portion of the annular shell.

3. The blast furnace tuyeres small sleeve front cavity body according to claim 1, characterized in that, The heat exchange enhancement component includes an annular plate, which may be one or multiple annular plates arranged coaxially. The first end of the annular plate is connected to the wall of the front end, and the second end extends toward the rear end. The annular plate defines at least two annular flow channels radially distributed along the annular shell in the cooling cavity to guide the flow of the cooling water. The annular plate is provided with the turbulence structure.

4. The blast furnace tuyeres small sleeve front cavity body according to claim 3, characterized in that, The turbulence structure includes turbulence holes penetrating the annular plate.

5. The blast furnace tuyeres small sleeve front cavity body according to claim 4, characterized in that, The annular plate is provided with a plurality of spaced-apart turbulence holes.

6. The blast furnace tuyeres small sleeve front cavity body according to claim 4, characterized in that, The annular plate is provided with multiple annular plates, and each annular plate is provided with a turbulence hole, and the turbulence holes on different annular plates correspond to each other radially along the annular shell.

7. The blast furnace tuyeres small sleeve front cavity body according to claim 4, characterized in that, The turbulence hole is a tapered hole, and the diameter of the tapered hole tends to decrease along the radial direction of the annular shell from the inner side wall to the outer side wall of the annular shell, so as to direct the cooling water through the turbulence hole.

8. The blast furnace tuyeres small sleeve front cavity body according to claim 3, characterized in that, The width of the annular flow channel near the inner peripheral sidewall of the annular housing is greater than the width of the annular flow channel near the outer peripheral sidewall of the annular housing.

9. The blast furnace tuyeres small sleeve front cavity body according to any one of claims 1-8, characterized in that, The height of the heat exchange enhancement component along the axial direction of the annular shell is less than the depth of the cooling cavity along the axial direction of the annular shell.

10. A small sleeve for a blast furnace tuyere, characterized in that, include: The blast furnace tuyeres small sleeve front cavity body as described in any one of claims 1-9; The rear cavity body is located at the rear end of the annular shell. The rear cavity body has a rear cavity cooling cavity inside, and the rear cavity body is provided with a rear cavity water inlet and a rear cavity water outlet that communicate with the rear cavity cooling cavity. The rear cavity cooling cavity is isolated from the cooling cavity.

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