Microchannel single-cavity tuyere small sleeve and blast furnace comprising microchannel single-cavity tuyere small sleeve

Abstract

The invention relates to a microchannel single-cavity tuyere small sleeve and a blast furnace comprising the microchannel single-cavity tuyere small sleeve, the microchannel single-cavity tuyere small sleeve comprises a small sleeve body, the small sleeve body is provided with a heat exchange cavity and a cooling cavity located on the periphery of the heat exchange cavity, and the heat exchange cavity penetrates through the small sleeve body in the length direction; the cooling cavity comprises a first cavity body and a second cavity body which are distributed in the length direction. The partition plate is arranged in the second cavity and surrounds the heat exchange cavity so as to divide the second cavity into a third cavity and a fourth cavity surrounding the radial outer side of the third cavity, and the sides, away from the first cavity, of the third cavity and the fourth cavity communicate with each other; and the at least one first cooling liquid pipe is arranged in the first cavity, the first end of the first cooling liquid pipe communicates with one of the third cavity and the fourth cavity, and the second end of the first cooling liquid pipe penetrates out of the side wall, away from the second cavity, of the first cavity. The temperature of the micro-channel single-cavity tuyere small sleeve is reduced, and damage caused by too high temperature is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of micro-channel single-cavity tuyere small sleeve, in particular to a micro-channel single-cavity tuyere small sleeve and a blast furnace comprising the same. BACKGROUND

[0002] The blast furnace is one of the core production links of a long-process steel enterprise, and the tuyere small sleeve, as an important component of the blast furnace, will lead to abnormal blast furnace downtime if damaged, which will cause direct economic losses to the enterprise. The tuyere small sleeve is a channel for blowing hot air and injecting pulverized coal into the blast furnace, and the front end of the small sleeve extends about 400-700 mm into the blast furnace wall. The 1200℃ hot air is blown into the blast furnace at high speed, and a combustion reaction occurs with the coke in the furnace, with a flame temperature of up to 2300℃ or above and a slag iron temperature of up to 1500℃ or above. The working conditions are very complex.

[0003] High temperature, ultra-high temperature environment, and molten iron are great challenges for the small sleeve. In order to improve the service life of the small sleeve and increase the overall efficiency of steelmaking, the current optimization scheme for the small sleeve is mainly to increase the cooling water flow or reduce the inlet water temperature to reduce the shell temperature of the small sleeve, thereby improving the service life of the small sleeve to a certain extent. Compared with the current development idea, the structural strength, heat exchange effect, and overall life of the small sleeve still cannot meet the use requirements. The biggest problem faced by the small sleeve is still poor heat exchange effect and high overall temperature, which leads to different degrees of wear and tear, melting loss, etc. at high temperature. The small sleeve cavity penetrates deep into the hearth, and the risk of damage is greater. Once the small sleeve body is damaged, the entire small sleeve will also be damaged immediately and cannot be used. Therefore, there is an urgent need in the art for a single-cavity tuyere small sleeve with enhanced heat exchange to prolong the service life and improve the benefits. SUMMARY

[0004] The present application provides a micro-channel single-cavity tuyere small sleeve and a blast furnace comprising the same. The micro-channel single-cavity tuyere small sleeve reduces the temperature of the micro-channel single-cavity tuyere small sleeve, avoids damage caused by excessively high temperature, and prolongs the service life.

[0005] According to a first aspect of the present application, a micro-channel single-cavity tuyere small sleeve is provided, comprising: a sleeve body provided with a heat exchange cavity and a cooling cavity located at the periphery of the heat exchange cavity, the heat exchange cavity extending through the sleeve body in the length direction, and the cooling cavity comprising a first cavity and a second cavity distributed along the length direction; a partition plate arranged in the second cavity and surrounding the heat exchange cavity to divide the second cavity into a third cavity and a fourth cavity surrounding the third cavity in the radial direction, the third cavity and the fourth cavity being communicated with each other at the side away from the first cavity; and at least one first cooling liquid pipe arranged in the first cavity, the first end of the first cooling liquid pipe being communicated with one of the third cavity and the fourth cavity, and the second end of the first cooling liquid pipe being led out from the side wall of the first cavity away from the second cavity.

[0006] Preferably, the inner circumferential surface of the partition plate is provided with a plurality of first division parts distributed along the circumferential direction to divide the third cavity into third cavity basic units distributed along the circumferential direction.

[0007] Preferably, the outer circumferential surface of the partition plate is provided with a plurality of second division parts distributed along the circumferential direction to divide the fourth cavity into fourth cavity basic units distributed along the circumferential direction.

[0008] Preferably, the third cavity basic units and the fourth cavity basic units correspond to each other one by one.

[0009] Preferably, the parts of the third cavity basic units close to the first cavity are communicated with each other.

[0010] Preferably, the parts of the fourth cavity basic units close to the first cavity are communicated with each other.

[0011] Preferably, the micro-channel single-cavity tuyere small sleeve further comprises: at least one second cooling liquid pipe arranged in the first cavity, the first end of the second cooling liquid pipe being communicated with the other one of the third cavity and the fourth cavity, and the second end of the second cooling liquid pipe being led out from the side wall of the first cavity away from the second cavity.

[0012] Preferably, the first division part is a cylinder, a rectangular column, or an elongated rib.

[0013] Preferably, the second division part is a cylinder, a rectangular column, or an elongated rib.

[0014] According to a second aspect of the present application, a blast furnace is provided, comprising a furnace body and a micro-channel single-cavity tuyere small sleeve as described in the first aspect, the tuyere small sleeve being arranged at the inlet of the furnace body, and one end of the tuyere small sleeve extending into the furnace body.

[0015] The micro-channel single-cavity tuyere small sleeve of the application is provided with a partition plate in the second cavity, thereby improving the heat exchange area, reducing the temperature of the micro-channel single-cavity tuyere small sleeve, avoiding damage caused by excessively high temperature, and prolonging the service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic view of the micro-channel single-cavity tuyere small sleeve of the application.

[0017] Figure 2 It is a front view of the micro-channel single-cavity tuyere small sleeve of the application.

[0018] Figure 3 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0019] Figure 4 It is a structural schematic view of the micro-channel single-cavity tuyere small sleeve of the application.

[0020] Figure 5 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at B-B in Figure 2

[0021] Figure 6 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0022] Figure 7 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0023] Figure 8 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0024] Figure 9 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0025] Figure 10 It is a sectional view of the micro-channel single-cavity tuyere small sleeve of the application at A-A in Figure 2

[0026] BRIEF DESCRIPTION OF REFERENCE NUMERALS:

[0027] 100, sleeve body;

[0028] 200, partition plate; 201, first divided part; 202, second divided part;

[0029] 300, first cooling liquid pipe;

[0030] 400, heat exchange cavity;

[0031] ​​​​​​​500, cooling cavity; 510, first cavity; 511, first through hole; 512, second through hole; 513, third through hole; 514, fourth through hole; 520, second cavity; 521, third cavity; 522, fourth cavity; 523, third cavity basic unit; 524, fourth cavity basic unit;

[0032] 600, second cooling liquid pipe. DETAILED DESCRIPTION

[0033] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.

[0034] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0035] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0036] In the present application, unless specifically defined and limited otherwise, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] The following will be described in conjunction with Figures 1 to 10 The micro-channel single-cavity tuyere small sleeve according to the embodiments of the present application is described.

[0038] As Figures 1 to 3 The present application provides a micro-channel single-cavity tuyere small sleeve, which comprises a small sleeve body 100, a partition plate 200 and at least one first cooling liquid pipe 300.

[0039] The small sleeve body 100 is provided with a heat exchange cavity 400 and a cooling cavity 500 located at the periphery of the heat exchange cavity 400. The heat exchange cavity 400 extends through the small sleeve body 100 in the length direction, and the cooling cavity 500 comprises a first cavity 510 and a second cavity 520 distributed along the length direction. The second cavity 520 is located at the front side of the first cavity 510.

[0040] The partition plate 200 is arranged in the second cavity 520 and surrounds the heat exchange cavity 400, so as to divide the second cavity 520 into a third cavity 521 and a fourth cavity 522 surrounding the radial outer side of the third cavity 521. The sides (i.e. the front sides) of the third cavity 521 and the fourth cavity 522 away from the first cavity 510 communicate with each other.

[0041] The first cooling liquid pipe 300 is arranged in the first cavity 510. The first end of the first cooling liquid pipe 300 communicates with one of the third cavity 521 and the fourth cavity 522, and the second end of the first cooling liquid pipe 300 penetrates out of the side wall (i.e. the rear side wall) of the first cavity 510 away from the second cavity 520.

[0042] The micro-channel single-cavity tuyere small sleeve of the present application is provided with a partition plate 200 in the second cavity 520, which increases the heat exchange area, reduces the temperature of the micro-channel single-cavity tuyere small sleeve, avoids damage caused by excessively high temperature, and prolongs the service life. The micro-channel single-cavity tuyere small sleeve of the present application reduces the flow guide structure compared with the prior art, has a simple structure, fewer types of components, a simple structure and low cost. The micro-channel single-cavity tuyere small sleeve is integrally formed by block casting and welding, the forming process is simple, and it is suitable for low-cost mass production.

[0043] In addition, the present application cancels the flow guide in the prior art, and the second cavity 520 is not separated into multiple cavities by the flow guide, so that the cooling liquid does not exist the problem of cavity connection in the cavity.

[0044] Embodiment 1

[0045] The micro-channel single-cavity tuyere small sleeve of the present embodiment comprises a small sleeve body 100, a partition plate 200 and two first cooling liquid pipes 300 (see Figure 3 and Figure 4 ).

[0046] The small sleeve body 100 is provided with a heat exchange cavity 400 and a cooling cavity 500 located at the periphery of the heat exchange cavity 400, the heat exchange cavity 400 penetrates through the small sleeve body 100 in the length direction, and the cooling cavity 500 comprises a first cavity 510 and a second cavity 520 distributed along the length direction. The second cavity 520 is located at the front side of the first cavity 510.

[0047] The partition plate 200 is arranged in the second cavity 520 and surrounds the heat exchange cavity 400, so as to divide the second cavity 520 into a third cavity 521 and a fourth cavity 522 surrounding the radial outer side of the third cavity 521, and the sides (i.e. front sides) of the third cavity 521 and the fourth cavity 522 away from the first cavity 510 are communicated with each other (see Figure 3 ). The fourth cavity 522 and the first cavity 510 are provided with a first through hole 511 (see Figure 4 ), and the rear side wall (i.e. the side wall away from the second cavity 520) of the first cavity 510 is provided with a second through hole 512 (see Figure 1 ).

[0048] As shown in Figure 3 and Figure 4 , the first cooling liquid pipe 300 is arranged in the first cavity 510, the first end of the first cooling liquid pipe 300 is communicated to the third cavity 521, and the second end of the first cooling liquid pipe 300 penetrates out from the side wall (i.e. the rear side wall) of the first cavity 510 away from the second cavity 520. Specifically, the rear side wall (i.e. the side wall away from the second cavity 520) of the first cavity 510 is provided with a third through hole 513 (see Figure 1 ), and the third cavity 521 and the first cavity 510 are provided with a fourth through hole 514 (see Figure 4 ), the first end of the first cooling liquid pipe 300 penetrates through the fourth through hole 514, and the second end of the first cooling liquid pipe 300 penetrates through the third through hole 513.

[0049] The first cooling liquid pipe 300 is used as an inlet cooling liquid pipe to supplement cooling liquid, and the part of the first cavity 510 without the first cooling liquid pipe 300 is used to discharge cooling liquid whose temperature has been raised. The first cooling liquid pipe 300 can separate the newly-supplemented cooling liquid with a lower temperature from the used cooling liquid with a raised temperature.

[0050] The cooling liquid enters the first cooling liquid pipe 300 from the second end of the first cooling liquid pipe 300, then passes through the first end of the first cooling liquid pipe 300 to enter the third cavity 521, and flows in the third cavity 521 to contact the inner surface of the third cavity 521, thereby performing the first heat exchange.

[0051] The cooling liquid flows from the rear side of the third cavity 521 to the front side of the third cavity 521, passes through the front side of the third cavity 521 to enter the front side of the fourth cavity 522, and then flows in the fourth cavity 522 to contact the inner surface of the fourth cavity 522, thereby performing the second heat exchange.

[0052] The cooling liquid flows from the front side of the fourth cavity 522 to the rear side of the fourth cavity 522, and enters the first cavity 510 through the first through hole 511.

[0053] The cooling liquid in the first cavity 510 flows out of the first cavity 510 through the second through hole 512.

[0054] It should be noted that the radial inner surface of the micro-channel single-cavity tuyere small sleeve in Embodiment 1 (i.e., the radial inner surface of the heat exchange cavity 400) has the highest temperature, and the cooling liquid needs to pass through the third cavity 521 first and then pass through the fourth cavity 522, so the first cooling liquid pipe 300 as an inlet cooling liquid pipe needs to be connected to the third cavity 521.

[0055] That is, the cooling liquid first cools the one with the highest temperature in the third cavity 521 and the fourth cavity 522 to conduct the temperature from the high-temperature part to the low-temperature part, thereby realizing the directional heat dissipation function in accordance with the law of thermodynamics, and the temperature can be reduced by about 60℃ compared with the conventional small sleeve shell, thereby further improving the heat exchange efficiency.

[0056] Further, as shown in Figure 5 The inner circumferential surface of the partition plate 200 is provided with a plurality of first division parts 201 distributed along the circumference to divide the third cavity 521 into third cavity basic units 523 distributed along the circumference, thereby increasing the contact area of the cooling liquid with the third cavity 521 and improving the cooling effect. In addition, the first division part 201 can also enhance the structural strength of the partition plate 200.

[0057] Among them, according to the specific thermal environment, the plurality of first division parts 201 can be uniformly distributed along the circumference, or can be non-uniformly distributed along the circumference.

[0058] Further, the first partitioning part 201 is a cylinder, a cuboid, or an elongated rib.

[0059] The first partitioning part 201 can be integrally formed with the partition plate 200, and the integrally formed manner can improve the structural strength and reduce the risk of leakage. The first partitioning part 201 can be fixed on the inner circumferential surface of the partition plate 200 by welding or the like, and the detachable connection manner is convenient for maintenance and cleaning.

[0060] Further, as shown in Figure 5 The outer circumferential surface of the partition plate 200 is provided with a plurality of second partitioning parts 202 distributed along the circumference, so as to divide the fourth cavity 522 into fourth cavity basic units 524 distributed along the circumference, so as to increase the contact area of the cooling liquid with the fourth cavity 522, thereby improving the cooling effect. In addition, the second partitioning part 202 can also enhance the structural strength of the partition plate 200.

[0061] Among them, according to the specific thermal environment, the plurality of second partitioning parts 202 can be uniformly distributed along the circumference, or can be non-uniformly distributed along the circumference.

[0062] The partition plate 200 provided with a plurality of first partitioning parts 201 and a plurality of second partitioning parts 202 greatly increases the heat exchange area, intersects with the traditional small sleeve, and the heat exchange area is increased by 500%, significantly improving the heat exchange efficiency.

[0063] Further, the second partitioning part 202 is a cylinder, a cuboid, or an elongated rib.

[0064] The second partitioning part 202 can be integrally formed with the partition plate 200, and the integrally formed manner can improve the structural strength and reduce the risk of leakage. The second partitioning part 202 can be fixed on the inner circumferential surface of the partition plate 200 by welding or the like, and the detachable connection manner is convenient for maintenance and cleaning.

[0065] Further, the number of the third cavity basic units 523 and the fourth cavity basic units 524 is the same and one-to-one correspondence, that is, the front side of one third cavity basic unit 523 communicates with the front side of one corresponding fourth cavity basic unit 524. In other embodiments, the number of the third cavity basic units 523 and the fourth cavity basic units 524 can not be equal, but it is necessary to ensure that each third cavity basic unit 523 is communicated to at least one fourth cavity basic unit 524, and each fourth cavity basic unit 524 is communicated to one third cavity basic unit 523.

[0066] Furthermore, the portions of the multiple third cavity basic units 523 that are close to the first cavity 510 are interconnected, so that even when the number of first coolant pipes 300 is less than the number of third cavity basic units 523, coolant can still flow into each third cavity basic unit 523, thereby ensuring that each third cavity basic unit 523 is cooled.

[0067] Furthermore, the portions of the multiple fourth cavity basic units 524 near the first cavity 510 are interconnected, so that when the number of first through holes 511 between the fourth cavity 522 and the first cavity 510 is less than the number of fourth cavity basic units 524, it can still be ensured that the coolant in each fourth cavity basic unit 524 can flow into the first cavity 510 through the first through hole 511, thereby ensuring that each fourth cavity basic unit 524 is cooled.

[0068] Furthermore, water is preferred as the coolant.

[0069] Furthermore, the distance from the partition 200 to the inner surface of the second cavity 520 is equal to the distance from the partition 200 to the outer surface of the second cavity 520, that is, the radial thickness of the third cavity 521 is equal to the radial thickness of the fourth cavity 522.

[0070] Furthermore, the distance from the partition 200 to the inner surface of the second cavity 520 is not equal to the distance from the partition 200 to the outer surface of the second cavity 520, that is, the radial thickness of the third cavity 521 is not equal to the radial thickness of the fourth cavity 522.

[0071] Example 2

[0072] like Figure 6 As shown, the difference between Embodiment 2 and Embodiment 1 is that the radial outer surface of the microchannel single-cavity air vent sleeve (i.e., the radial outer surface of the fourth cavity 522) has the highest temperature. Therefore, the coolant needs to pass through the fourth cavity 522 first and then through the third cavity 521. Thus, the first coolant pipe 300, which serves as the coolant inlet pipe, needs to be connected to the fourth cavity 522.

[0073] Specifically, the coolant enters the fourth chamber 522 through the first coolant pipe 300, then cools the fourth chamber 522 and the third chamber 521 in sequence, and finally exits through the first chamber 510.

[0074] Example 3

[0075] like Figure 7As shown, the difference between this embodiment and Embodiment 1 is that the first coolant pipe 300 serves as the coolant outlet pipe and is connected to the fourth cavity 522. The coolant enters the third cavity 521 through the first cavity 510, then sequentially cools the third cavity 521 and the fourth cavity 522, and finally exits through the first coolant pipe 300.

[0076] Example 4

[0077] like Figure 8 As shown, the difference between Embodiment 4 and Embodiment 1 is that a second coolant pipe 600 is added inside the first cavity 510. The first end of the second coolant pipe 600 is connected to the fourth cavity 522, and the second end of the second coolant pipe 600 exits from the side wall of the first cavity 510 away from the second cavity 520 (i.e., the rearward side wall). The coolant enters the third cavity 521 through the first coolant pipe 600, then sequentially cools the third cavity 521 and the fourth cavity 522, and finally exits through the second coolant pipe 600.

[0078] Example 5

[0079] like Figure 9 As shown, the difference between Embodiment 5 and Embodiment 1 is that the radial outer surface of the microchannel single-cavity air vent sleeve (i.e., the radial outer surface of the fourth cavity 522) in Embodiment 5 has the highest temperature, and the first coolant pipe 300 serves as the coolant outlet pipe, connecting to the third cavity 521.

[0080] The coolant enters the fourth chamber 522 through the first chamber 510, then cools the fourth chamber 522 and the third chamber 521 in sequence, and finally exits through the first coolant pipe 300.

[0081] Example 6

[0082] like Figure 10 As shown, the difference between Embodiment 6 and Embodiment 4 is that the second coolant pipe 600 is used as the inlet coolant pipe and the first coolant pipe 300 is used as the outlet coolant pipe.

[0083] The coolant enters the fourth chamber 522 from the second coolant pipe 600, then cools the fourth chamber 522 and the third chamber 521 in sequence, and finally exits from the first coolant pipe 300.

[0084] This application also provides a blast furnace, which includes a furnace body and the aforementioned tuyeres sleeve.

[0085] The tuyere sleeve is installed at the furnace inlet, with one end of the tuyere sleeve extending into the furnace body.

[0086] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application embraces all such possible combinations.

[0087] The above-described embodiments only express several implementation manners of the application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A microchannel single-cavity air vent sleeve, characterized in that, include: The small sleeve body is provided with a heat exchange cavity and a cooling cavity located around the heat exchange cavity. The heat exchange cavity extends through the small sleeve body in the length direction, and the cooling cavity includes a first cavity and a second cavity distributed along the length direction. A partition is disposed within the second cavity and surrounds the heat exchange cavity to divide the second cavity into a third cavity and a fourth cavity surrounding the radially outer side of the third cavity, wherein the third cavity and the fourth cavity communicate with each other on the side away from the first cavity; At least one first coolant pipe is disposed in the first cavity, a first end of the first coolant pipe is connected to one of the third cavity and the fourth cavity, and a second end of the first coolant pipe extends out from the side wall of the first cavity away from the second cavity.

2. The microchannel single-cavity air vent sleeve according to claim 1, characterized in that, The inner circumferential surface of the partition is provided with a plurality of first divisions distributed along the circumferential direction to divide the third cavity into third cavity basic units distributed along the circumferential direction.

3. The microchannel single-cavity air vent sleeve according to claim 2, characterized in that, The outer circumferential surface of the partition is provided with a plurality of second dividing parts distributed along the circumferential direction to divide the fourth cavity into basic units of the fourth cavity distributed along the circumferential direction.

4. The microchannel single-cavity air vent sleeve according to claim 3, characterized in that, The third cavity basic unit corresponds one-to-one with the fourth cavity basic unit.

5. The microchannel single-cavity air vent sleeve according to claim 2, characterized in that, The portions of the plurality of third cavity basic units near the first cavity are connected to each other.

6. The microchannel single-cavity air vent sleeve according to claim 3, characterized in that, The portions of the plurality of fourth cavity basic units near the first cavity are connected to each other.

7. The microchannel single-cavity air vent sleeve according to claim 1, characterized in that, It further includes: At least one second coolant pipe is disposed within the first cavity, a first end of the second coolant pipe being connected to the other of the third and fourth cavities, and a second end of the second coolant pipe extending from the side wall of the first cavity away from the second cavity.

8. The microchannel single-cavity air vent sleeve according to claim 2, characterized in that, The first segment is a cylinder, a rectangular prism, or a long rib.

9. The microchannel single-cavity air vent sleeve according to claim 3, characterized in that, The second segment is a cylinder, a rectangular prism, or a long rib.

10. A blast furnace, characterized in that, Includes the furnace body and the air vent sleeve as described in any one of claims 1 to 9; The air vent sleeve is installed at the inlet of the furnace body, and one end of the air vent sleeve extends into the furnace body.

Images