Modular combined tuyere small sleeve and blast furnace

Abstract

The invention discloses a modular combined tuyere small sleeve and a blast furnace, the modular combined tuyere small sleeve is formed by connecting a ceramic module and a metal module, and the ceramic module is arranged at the front end of the metal module; the ceramic module comprises an inner ceramic module and an outer ceramic module arranged outside the inner ceramic module in a sleeving mode, the outer ceramic module, the inner ceramic module and the metal module are all cylindrical frustums, the outer ceramic module is fixedly connected with the metal module, and a part of tuyere channel is formed by the inner ceramic module along an axial through hole of the inner ceramic module. The modularized combined tuyere small sleeve provided by the embodiment of the invention has relatively high wear resistance, a durable structure and low heat conduction efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace smelting, in particular to a modular combined tuyere small sleeve and a blast furnace. BACKGROUND

[0002] In the process of blast furnace ironmaking, the tuyere small sleeve is an important part of the air supply system. Its traditional design concept mainly relies on the high thermal conductivity of pure copper material, which is cooled by internal circulating water to maintain structural stability, thereby ensuring the basic function of the air supply channel. With the continuous improvement of blast furnace smelting intensity, the operating conditions in the furnace are becoming increasingly harsh, including temperature rise, increased coal gas flow rate, and intensified slag erosion, etc. Multiple factors work together to cause the traditional copper tuyere small sleeve to face severe challenges in actual application. Although copper has excellent thermal conductivity, under the combined action of long-term high temperature, high-speed coal powder erosion and chemical corrosion, local melting, wear and even cracking may occur, which seriously restricts the service life of the tuyere. In response to these failures, the industry has tried to use hardfacing materials, surface spraying protective layers or covering ceramic coatings, etc. However, these methods can only partially alleviate a certain type of damage and cannot fundamentally solve the material failure problem in extreme thermal environments, especially the conflict between thermal conductivity requirements and corrosion resistance.

[0003] In addition, although the traditional water cooling method can control the tuyere temperature to a certain extent, it needs to continuously consume a large amount of cooling water and significantly increases the heat loss of the blast furnace system, resulting in an increase in fuel ratio, thereby reducing the economy of the overall smelting process. More seriously, once the tuyere small sleeve is damaged, the leakage of cooling water into the furnace not only causes fluctuations in the furnace conditions and disrupts the smelting process, but also may cause a sudden increase in steam pressure under high temperature conditions and even an explosion, posing a double threat to production stability and personnel safety. Therefore, under the existing technical system, there is still a significant deficiency in the design of the tuyere small sleeve that can balance the thermal conductivity efficiency, structural durability and energy economy. SUMMARY

[0004] In view of the technical problems existing in the prior art, the present application provides a modular combined tuyere small sleeve and a blast furnace, wherein the front end of the tuyere small sleeve is made of ceramic material, which has high heat resistance and wear resistance. In addition, since the front end does not need to be cooled by water, the supply of water and the energy consumption caused by the supply of water can be reduced. Moreover, the low thermal conductivity of the ceramic material can reduce the heat loss inside the blast furnace, thereby achieving energy saving effect and reducing the fuel ratio by 2-10 kg.

[0005] The embodiment of the present application provides a modular combined tuyere small sleeve, the tuyere small sleeve is connected by a ceramic module and a metal module, the ceramic module is arranged at the front end of the metal module; the ceramic module comprises an inner ceramic module and an outer ceramic module sleeved outside the inner ceramic module, the outer ceramic module, the inner ceramic module and the metal module are all in the shape of a cylindrical frustum, the outer ceramic module is fixedly connected with the metal module, and the through hole of the inner ceramic module along the axial direction forms part of a tuyere channel of the tuyere small sleeve.

[0006] Optionally, the center line of the center of the front end outlet of the inner wall of the inner ceramic module and the center of the rear end outlet of the inner wall is not on the same straight line as the axis of the outer wall of the inner ceramic module.

[0007] Optionally, the wall thickness of the inner wall of the inner ceramic module near the front end outlet is not equal to the wall thickness of the inner wall near the rear end outlet.

[0008] Optionally, the metal module is a pure copper cooling module, the metal module is provided with a cooling water channel, and the rear end surface of the metal module is provided with a cooling water outlet and a cooling water inlet.

[0009] Optionally, the front end of the metal module and the rear end of the outer ceramic module are fixedly connected to form a connecting end, and the axial hole of the metal module and the through hole of the inner ceramic module along the axial direction constitute a tuyere channel of the tuyere small sleeve.

[0010] Optionally, the connecting end comprises a fixed groove and a convex rib arranged in the circumferential direction of the connecting end surface of the metal module and the outer ceramic module, the convex rib is clamped in the fixed groove, and the side walls of the two are fixed through a connecting piece; the front end surface of the metal module and the rear end surface of the inner ceramic module are in close contact on the connecting end.

[0011] Optionally, the inner wall of the outer ceramic module near the front end surface is provided with a positioning step, and the positioning step is in contact with the front end surface of the inner ceramic module.

[0012] Optionally, one side of the convex rib on the connecting end near the tuyere channel is fixed through thread connection with the side wall of the metal module adjacent to the side wall.

[0013] Optionally, the rear end surface of the outer ceramic module is provided with a ceramic convex rib in the circumferential direction, the metal module is sleeved on the ceramic convex rib and fixedly connected with the outer ceramic module, and the rear end surface of the metal module is closed; the inner side wall of the outer ceramic module is provided with a limiting groove, the inner ceramic module is arranged in the limiting groove, and the inner side wall of the ceramic convex rib and the inner side wall of the inner ceramic module constitute the inner wall of the tuyere channel of the tuyere small sleeve.

[0014] Optionally, a fracture-preventing groove is formed at the connection between the ceramic protruding ridge and the outer ceramic module.

[0015] Optionally, a thread is formed on the ceramic protruding ridge, and the ceramic protruding ridge is fixedly connected with the metal module through the thread.

[0016] Optionally, the application further comprises a first temperature measuring module and a second temperature measuring module, the first temperature measuring module is inserted into the metal module to measure the temperature in the metal module, and the second temperature measuring module is inserted into the metal module and the outer ceramic module to measure the temperature in the outer ceramic module.

[0017] The application further provides a blast furnace, which comprises at least a blast furnace body, a tuyere middle sleeve and a tuyere large sleeve on a hearth in the blast furnace body, and the tuyere small sleeve as described above is further arranged on the hearth, the front end of the tuyere middle sleeve is sleeved on the outer wall of the metal module of the tuyere small sleeve, and the ceramic module is arranged inside the blast furnace body.

[0018] The front end of the tuyere small sleeve is made of ceramic material, which has high heat resistance and wear resistance, and since the front end does not need to be cooled by water, the water supply and the energy consumption caused by the water supply can be reduced, and the low thermal conductivity of the ceramic material can reduce the heat loss inside the blast furnace, thereby achieving energy saving effect and reducing the fuel ratio by 2-10 kg. BRIEF DESCRIPTION OF DRAWINGS

[0019] The preferred embodiments of the application will be further described in detail below with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a modular combined tuyere small sleeve according to an embodiment of the application; Figure 2 is a perspective view of a ceramic module according to an embodiment of the application; Figure 1 is a sectional view along A-A of the structure shown in the figure; Figure 3 is an axial sectional view of another embodiment of the application; Figure 4 is a perspective view of an inner ceramic module according to an embodiment of the application; Figure 5 is a perspective view of another inner ceramic module according to an embodiment of the application; Figure 6 is a perspective view of still another ceramic module according to an embodiment of the application; Figure 7 is a structure schematic view of a metal module according to an embodiment of the application, which is unfolded along the circumferential direction and cut along the circumferential direction; Figure 8 is a sectional view along the axial direction of still another modular combined tuyere small sleeve according to an embodiment of the application.

[0020] Reference signs: 100, modular combined tuyere small sleeve; 101, ceramic module; 102, metal module; 1011, inner ceramic module; 1012, outer ceramic module; 1116, inner hole; 111, front end outer hole; 112, rear end outer hole; 1014, front end inner hole; 1015, rear end inner hole; 1021, cooling water channel; 401, reversing partition; 150, connecting end; 1501, fixed groove; 1502, convex rib; 117, positioning step; 1016, front end face; 501, ceramic convex rib; 403, anti-fracture groove; 4011, screw thread; 118, threaded connection structure; 107, first temperature measurement module; 108, second temperature measurement module; 190, connecting piece; 301, outer circular table; 201, inner circular table; 1023, cooling water outlet; 1024, cooling water inlet; 160, tuyere channel; 503, hollow channel. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0022] In the following detailed description, reference can be made to the various drawings that form a part of the present application and are used to illustrate specific embodiments of the present application. In the drawings, like reference numerals describe generally similar components throughout the several views. Various specific embodiments of the present application are described in sufficient detail below so that those skilled in the relevant arts can apply the teachings of the present application. It is to be understood that other embodiments can be utilized and structural, logical, and electrical changes can be made without departing from the scope of the present application.

[0023] Figure 1 is a perspective structural schematic diagram of a modular combined tuyere small sleeve according to an embodiment of the present application. Figure 2 is Figure 1 is a sectional view along A-A of the structure shown in Figure 1 and Figure 2As shown, the modular combined tuyere small sleeve 100 is connected by a ceramic module 101 and a metal module 102, and the ceramic module 101 is arranged at the front end of the metal module 102. The ceramic module 101 includes an inner ceramic module 1011 and an outer ceramic module 1012 sleeved outside the inner ceramic module 1011. The outer ceramic module 1012, the inner ceramic module 1011 and the metal module 102 are all cylindrical frustums, and the outer wall conical surface of the inner ceramic module 1011 and the inner conical surface of the outer ceramic module 1012 are fixed by conical surface cooperation. The outer ceramic module 1012 is fixedly connected with the metal module 102, and the inner hole 1116 (an axial through hole) of the inner ceramic module 1011 is a partial tuyere channel.

[0024] The front end of the tuyere small sleeve provided in the application is made of ceramic material, has high heat resistance and wear resistance, and can reduce water supply and energy consumption caused by water supply due to the fact that the front end does not need to be cooled by water. In addition, the low thermal conductivity of the ceramic material can reduce the loss of heat inside the blast furnace, achieve energy-saving effect, and reduce the fuel ratio by 2-10 kg.

[0025] Figure 3 FIG. 6 is a cross-sectional view of another modular combined tuyere small sleeve according to an embodiment of the application along an axial direction. Figure 3 The embodiment shown in FIG. 6 is different from the embodiment shown in FIG. 1 in that the front end inner hole 1014 of the inner ceramic module 1011 does not coincide with the center of the front end outer hole 111. Figure 2 The embodiment shown in FIG. 6 is different from the embodiment shown in FIG. 1 in that the front end inner hole 1014 of the inner ceramic module 1011 does not coincide with the center of the front end outer hole 111. Figure 2 In the embodiment shown in FIG. 1, the inner ceramic module 1011 has the same wall thickness at the front end and the rear end, the center of the front end inner hole 1014 of the inner ceramic module 1011 coincides with the center of the front end outer hole 111 of the inner ceramic module 1011, the center of the rear end inner hole 1015 of the inner ceramic module 1011 coincides with the center of the rear end outer hole 112 of the inner ceramic module 1011, and the value of the air outlet angle F corresponds to Q, such as 5°. In the embodiment shown in FIG. 6, the inner ceramic module 1011 has the same wall thickness at the front end and the rear end, the center of the front end inner hole 1014 of the inner ceramic module 1011 does not coincide with the center of the front end outer hole 111 of the inner ceramic module 1011, the center of the rear end inner hole 1015 of the inner ceramic module 1011 does not coincide with the center of the rear end outer hole 112 of the inner ceramic module 1011, and the value of the air outlet angle F corresponds to P, such as 10°. Figure 3In the shown embodiment, the center of the front end inner hole 1014 of the inner ceramic module 1011 does not coincide with the center of the front end outer hole 111, or, the wall thickness near the front end outlet of the inner ceramic module is not equal to the wall thickness of the rear end outlet, in which case, the value of the air outlet angle F is R, for example, 3°, obviously, the angle values of Q and R are not equal. As can be seen, by changing the position of the front end inner hole of the inner ceramic module on the front end face of the inner ceramic module, the air outlet angle of the tuyere small sleeve can be changed. In another aspect, the straight line M passing through the center of the front end inner hole 1014 of the inner ceramic module 1011 and the center of the rear end inner hole 1015 can form an angle B with the axis T of the outer wall of the inner ceramic module 1011, by changing the angle of the angle B, the air outlet angle of the tuyere small sleeve can be changed. In addition, Figure 2 The diameters D of the front end inner holes of the inner ceramic modules of the shown embodiments are also not equal, by changing the size of the diameter D, the tuyere diameter of the tuyere small sleeve can also be changed. Figure 3 The diameters D of the front end inner holes of the inner ceramic modules of the shown embodiments are also not equal, by changing the size of the diameter D, the tuyere diameter of the tuyere small sleeve can also be changed.

[0026] Figure 4 is a perspective view of an inner ceramic module according to an embodiment of the present application. Figure 5 is a perspective view of another inner ceramic module according to an embodiment of the present application. Figure 4 The structure of the shown embodiment is different from that of Figure 5 The structure of the shown embodiment is different from that of Figure 5 The center of the front end inner hole of the inner ceramic module of the shown embodiment does not coincide with the center of the outer hole, and the inner ceramic module has wall thicknesses of different thicknesses along the axial direction. In combination with Figure 5 As shown, the front end inner hole 1014 of the inner ceramic module 1011, the rear end inner hole 1015 and the side surface connecting the two inner holes form an inner circular truncated cone 201, and the front end outer hole 111 of the inner ceramic module 1011, the rear end outer hole 112 and the side surface connecting the two outer holes form an outer circular truncated cone 301. Since the center of the front end inner hole 1014 of the inner ceramic module 1011 does not coincide with the center of the front end outer hole 111, the inner circular truncated cone 201 is an asymmetric truncated cone structure, therefore, the connecting line between the center of the front end inner hole 1014 and the center of the rear end inner hole 1015 of the inner circular truncated cone 201 has a preset angle with the axis of the outer circular truncated cone, and the hot air entering the tuyere small sleeve is sprayed along the through hole of the inner circular truncated cone, therefore, by controlling the size of the preset angle, the air outlet direction of the tuyere small sleeve can be changed, that is, by adjusting the position of the front end inner hole of the inner ceramic module on the front end face of the inner ceramic module, the air outlet direction of the tuyere small sleeve can be changed.

[0027] Figure 6 is a perspective view of another ceramic module according to an embodiment of the present application. Figure 4 The shown embodiment is different from that of Figure 6The difference of the embodiment shown is: Figure 6 The diameter of the front end inner hole 1014 of the inner ceramic module of the embodiment shown is less than Figure 4 The diameter of the front end inner hole 1014 of the inner ceramic module of the embodiment shown is less than Figures 2-6 As shown, the diameter of the rear end inner hole 1015 of the inner ceramic module 1011 is consistent with the inner diameter of the front end face of the adjacent metal module 102, and the center of the rear end inner hole 1015 of the inner ceramic module 1011 is located on the axis of the inner hole of the metal module 102. In this case, the diameter of the air outlet of the tuyere small sleeve can also be adjusted by adjusting the diameter D of the front end inner hole 1014 of the inner ceramic module 1011.

[0028] Figure 7 The structure schematic diagram of the metal module of the embodiment of the application is unfolded along the circumferential direction and cut along the circumferential direction. As shown in Figure 2 and Figure 7 As shown, the metal module 102 is a pure copper cooling module, the metal module 102 is provided with a cooling water channel 1021, the rear end face of the metal module 102 is provided with a cooling water outlet 1023 and a cooling water inlet 1024, and the cooling water flows along the cooling water flow direction L. As shown in Figure 2 and Figure 7 As shown, the metal module 102 is provided with the cooling water channel 1021, and the metal module further comprises a plurality of reversing partitions 401. The reversing partitions 401 are arranged to make the cooling water in the cooling water channel flow in an S shape, thereby increasing the flow length of the cooling water channel and improving the heat exchange capacity of the metal module without changing the volume of the metal module.

[0029] Further, as shown in Figure 2 As shown, the front end of the metal module 102 and the rear end of the outer ceramic module 1012 are fixedly connected to form a connecting end 150, and the through hole of the metal module 102 along the axial direction and the through hole of the inner ceramic module 1011 along the axial direction constitute the air outlet channel of the modular combined tuyere small sleeve 100. In some embodiments of the application, the connecting end 150 comprises a fixed groove 1501 and a convex rib 1502 arranged correspondingly in the circumferential direction of the connecting end face of the metal module 102 and the outer ceramic module 1012. The convex rib 1502 is clamped in the fixed groove 1501, and the side walls of the two are fixed by a connecting piece 190 at the joint. The front end face of the metal module 102 on the connecting end 150 is in close contact with the rear end face of the inner ceramic module 1011.

[0030] In some embodiments of the present application, the outer ceramic module 1012 is provided with a positioning step 117 near the inner wall of the front end face, and the positioning step 117 is in contact with the front end face 1016 of the inner ceramic module 1011. The positioning step 117 can play a role in positioning when the inner ceramic module 1011 is installed. Moreover, due to the positioning step, the front end face of the outer ceramic module has a ceramic structure, which can protect the front end face 1016 of the inner ceramic module 1011.

[0031] In order to strengthen the connection strength of the outer ceramic module and the metal module, the convex rib 1502 on the connecting end 150 is fixed to the side wall of the metal module 102 adjacent to one side of the tuyere channel through the threaded connection structure 118.

[0032] Figure 8 is another axial sectional view of a modular combined tuyere small sleeve according to an embodiment of the present application. As shown in Figure 8 the ceramic convex rib 501 is provided on the rear end face of the inner ceramic module 1011 along the circumferential direction, the metal module 102 is sleeved on the ceramic convex rib 501 and fixedly connected with the outer ceramic module 1012, and the rear end face of the metal module 102 is closed; the inner side wall of the outer ceramic module 1012 is provided with the positioning step 117, and the inner side wall of the ceramic convex rib 501 and the inner side wall of the inner ceramic module 1011 form the inner wall of the tuyere channel 160 of the tuyere small sleeve.

[0033] In this embodiment, the inner hole of the inner ceramic module 1011 and the inner hole of the ceramic convex rib 501 serve as the tuyere channel of the tuyere small sleeve, and the metal module is made of a high-temperature-resistant metal material, for example, a steel material. In this way, due to the low thermal conductivity of the ceramic convex rib 501, the metal module can not be cooled by cooling water, which not only saves the use of cooling water, but also further reduces the loss of heat in the blast furnace caused by the use of cooling water. Moreover, in this embodiment, the metal module 102 is further provided with a hollow channel 503 arranged along the circumferential direction of the metal module, which not only reduces the amount of metal material used in the metal module and reduces the manufacturing cost, but also improves the heat dissipation capacity of the metal module.

[0034] In some embodiments of the present application, the metal module 102 can be made of copper material, but a cooling water channel and a cooling water inlet and outlet are required to improve the high-temperature resistance of the metal module. However, due to the presence of the ceramic convex rib, the cooling capacity requirement of the cooling water channel is reduced, and a particularly complex water channel structure is not required. For example, compared with the cooling water channel structure shown in Figure 7 the temperature of the metal module will not be too high even if no reversing baffle is provided.

[0035] Continuing to refer to Figure 8As shown, in this embodiment, the ceramic ridge 501 is optionally provided with a fracture prevention groove 403 at the joint with the outer ceramic module 1012. In this way, if the outer ceramic module at the front end breaks during use, the break will not spread to the ceramic ridge part, thereby preventing a gap from being formed between the metal module and the tuyere inner sleeve, causing the high-temperature smelting material in the blast furnace to spatter out, causing production safety problems.

[0036] In some embodiments of the present application, the ceramic ridge 501 is optionally provided with a thread 4011, and the ceramic ridge 501 is fixedly connected to the metal module 102 through the thread 4011. By fixingly connecting through the thread 4011, the connection strength of the metal module and the ceramic module can be improved.

[0037] Continuing to refer to Figure 2 or Figure 8 As shown, the modular combined tuyere inner sleeve 100 further includes a first temperature measuring module 107 and a second temperature measuring module 108. The first temperature measuring module 107 is inserted into the metal module 102 and is used to measure the temperature in the metal module 102. The second temperature measuring module 108 is inserted into the metal module 102 and the outer ceramic module 101 and is used to measure the temperature in the outer ceramic module 101. In some embodiments of the present application, the first temperature measuring module and the second temperature measuring module are both thermometers. Alternatively, the first temperature measuring module and the second temperature measuring module can also be temperature measuring rods provided with a temperature sensor at the end, and the temperature measuring rod is further provided with a control circuit. The temperature sensor is electrically connected to the control circuit. The signal measured by the temperature sensor is sent to the control circuit. The control circuit converts the measured signal into a temperature value and sends the temperature to a receiving end once every certain period of time. The receiving end is provided with an alarm. When the receiving end determines that the temperature is abnormal, the alarm is triggered.

[0038] The first temperature measuring module 107 is used to monitor the use condition of the metal module 102 in the tuyere inner sleeve. Under normal circumstances, the temperature is lower than 45℃. If the temperature abnormally rises, it can be judged that the ceramic module 101 has cracked and failed, and the ceramic module 101 needs to be replaced as soon as possible, so that the problem can be found and treated in advance. The second temperature measuring module 108 is used to monitor the use condition of the ceramic module 101 in the tuyere inner sleeve. Under normal circumstances, the temperature is detected. If the ceramic module 101 has thinned and failed, the second temperature measuring module 108 fails, and the detected temperature disappears. Therefore, it can be judged that the ceramic has thinned and failed, and the ceramic module needs to be replaced at an appropriate time.

[0039] The present application also proposes a blast furnace (not shown in the figure) including at least a blast furnace body. The blast furnace body includes a tuyere inner sleeve and a tuyere outer sleeve on the hearth. The tuyere inner sleeve of the present application is also included in the tuyere inner sleeve. The front end of the tuyere inner sleeve is sleeved on the outer wall of the metal module of the tuyere inner sleeve, and the ceramic module is placed inside the blast furnace body.

[0040] In summary, the embodiment of the present application proposes a modular combined tuyere small sleeve, which has the following advantages: (1) The high-temperature-resistant, wear-resistant, high-strength, and low-thermal-conductivity properties of the front inner and outer ceramic modules make the tuyere not be troubled by problems such as melting and wear during use, which can greatly prolong the service life of the tuyere. At the same time, since the ceramic modules do not need to be cooled by water, the energy consumption of water supply can be reduced.

[0041] (2) The front inner ceramic module can replace and adjust the parameters such as the diameter (φ100-φ135) and angle (±5°) of the tuyere, which is convenient for on-site organization of production.

[0042] (3) The sealing and cooling performance of the rear copper cooling module can ensure the sealing effect with the middle sleeve and the straight blow pipe, and prevent the phenomenon of air leakage during use. The internal water channel of the copper cooling module can enhance heat exchange, ensure that the contact surface temperature with the ceramic is lower than 60℃, and the copper cooling module can serve as an insurance after being cooled by water, preventing the furnace material from being sprayed out after the ceramic module is damaged, and ensuring production safety.

[0043] (4) The use of the temperature measurement module can discover problems in advance and handle them in time.

[0044] The above embodiments are only used to illustrate the present application, and are not intended to limit the present application. Those skilled in the art can make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions shall belong to the scope of the present application.

Claims

1. A modular, combined tuyere nosepiece, characterized in that, The modular combined tuyere small sleeve is connected by ceramic modules and metal modules, the ceramic modules are arranged at the front end of the metal modules, the ceramic modules include an inner ceramic module and an outer ceramic module sleeved outside the inner ceramic module, the outer ceramic module, the inner ceramic module and the metal module are all in the shape of a cylindrical frustum, the outer ceramic module is fixedly connected with the metal module, and the through hole of the inner ceramic module along the axial direction forms part of the tuyere channel of the tuyere small sleeve.

2. The modular combination tuyere patch as claimed in claim 1, wherein, The center line of the centers of the front end outlet of the inner wall of the inner ceramic module and the rear end outlet of the inner wall is not on the same straight line as the axis of the outer wall of the inner ceramic module.

3. The modular combination tuyere patch as claimed in claim 2, wherein, The wall thickness of the inner ceramic module near the front end outlet is not equal to the wall thickness of the rear end outlet.

4. The modular combination tuyere patch as defined in claim 1, wherein, The metal module is a pure copper cooling module, the metal module is provided with a cooling water channel, and the rear end surface of the metal module is provided with a cooling water outlet and a cooling water inlet.

5. The modular combination tuyere patch of claim 4, wherein, The front end of the metal module and the rear end of the outer ceramic module are fixedly connected to form a connecting end, the axial hole of the metal module and the through hole of the inner ceramic module along the axial direction constitute the tuyere channel of the tuyere small sleeve.

6. The modular combination tuyere patch of claim 5, wherein, The connecting end includes fixed grooves and convex ribs arranged in the circumferential direction of the connecting end surface of the metal module and the outer ceramic module, the convex ribs are clamped in the fixed grooves, and the side walls of the two are fixed through a connecting piece. The front end surface of the metal module on the connecting end is tightly connected with the rear end surface of the inner ceramic module.

7. The modular combination tuyere patch as defined in claim 6, wherein, The inner wall of the outer ceramic module near the front end surface is provided with a positioning step, and the positioning step is connected with the front end surface of the inner ceramic module.

8. The modular combination tuyere patch of claim 6, wherein, The side wall of the metal module adjacent to the side of the convex rib near the tuyere channel on the connecting end is fixed through threaded connection.

9. The modular combination tuyere patch of claim 1 wherein, The rear end surface of the outer ceramic module is provided with a ceramic convex rib in the circumferential direction, the metal module is sleeved on the ceramic convex rib and fixedly connected with the outer ceramic module, and the rear end surface of the metal module is closed. The inner side wall of the outer ceramic module is provided with a limiting step, the inner side wall of the ceramic convex rib and the inner side wall of the inner ceramic module constitute the inner wall of the tuyere channel of the tuyere small sleeve.

10. The modular combination tuyere patch of claim 9, wherein, A fracture prevention groove is arranged at the connection between the ceramic convex rib and the outer ceramic module.

11. The modular combination tuyere patch of claim 9, wherein, Screws are arranged on the ceramic convex rib, and the ceramic convex rib is fixedly connected with the metal module through the screws.

12. The modular combination tuyere patch of claim 1 wherein, The first temperature measuring module is arranged in the metal module and used for measuring the temperature in the metal module, and the second temperature measuring module is arranged in the metal module and the outer ceramic module and used for measuring the temperature in the outer ceramic module.

13. A blast furnace comprising at least a blast furnace body, a tuyere bush and a tuyere mantle above a hearth in the blast furnace body, characterized in that The furnace also comprises the tuyere small sleeve according to any one of claims 1-12, the front end of the tuyere small sleeve is sleeved on the outer wall of the metal module of the tuyere small sleeve, and the ceramic modules are arranged in the interior of the blast furnace body.

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