Internal cooling system of annular furnace and annular furnace

Abstract

The utility model discloses an in-furnace cooling system of an annular furnace and the annular furnace, belongs to the technical field of heat treatment equipment, and aims to more quickly and accurately control the cooling temperature and the cooling speed in a second cooling section. The cooling system in the annular furnace comprises an air supply main pipe (1), a furnace top air supply main pipe (2), a furnace side air supply main pipe (3), a furnace top indirect radiation cooling pipe (4), a furnace inner peripheral side cooling air blowing pipe (5), a furnace outer peripheral side cooling air blowing pipe (6) and an air exhaust main pipe (7). According to the furnace top indirect radiation cooling pipe, the furnace inner peripheral side cooling air blowing pipe and the furnace outer peripheral side cooling air blowing pipe of the annular furnace inner cooling system, when the annular furnace inner cooling system is used in the second cooling section, the cooling temperature and the cooling speed in the second cooling section can be more rapidly and accurately controlled.

Description

Technical Field

[0001] This utility model relates to the technical field of heat treatment equipment, specifically to an internal cooling system for an annular furnace, or an annular furnace itself. Background Technology

[0002] Grain-oriented silicon steel is a core material specifically used in the manufacture of transformers, and the high-temperature annealing ring furnace is an indispensable key piece of equipment in the metallurgical industry for producing grain-oriented silicon steel. The ring furnace has a complex structure and high technological content, and is hailed as the crown jewel of the metallurgical industry's furnaces. The ring furnace sequentially contains the following sections: loading and unloading section 911, preheating section 912, first soaking section 913, heating section 914, second soaking section 915, first cooling section 916, second cooling section 917, third cooling section 918, and fourth cooling section 919. Figure 1 and Figure 2 As shown. Each section contains multiple material positions 94, and each material position 94 contains inner material positions and outer material positions set inside and outside.

[0003] Inside the ring furnace, the steel coil undergoes a series of complex heating and holding processes, including primary heating, primary holding, secondary heating, secondary holding, primary cooling, secondary cooling, tertiary cooling, and quaternary cooling, ultimately completing the high-temperature annealing process of the grain-oriented silicon steel.

[0004] During the high-temperature annealing and cooling process in a high-temperature annealing ring furnace, grain-oriented silicon steel coils must be covered with an inner shroud to prevent high-temperature oxidation. Different protective gases are introduced at different temperature stages to ensure that the steel coils complete the heating, high-temperature annealing, and cooling processes under a protective atmosphere. The protective atmosphere used is N2, H2, or a mixture of N2 and H2.

[0005] Of the four cooling sections mentioned above:

[0006] The steel coil is slowly cooled from the process annealing temperature to ~1080℃ in the first cooling section 916. The cooling rate should not be too fast, usually controlled within 10~15℃ / h. Otherwise, the temperature difference between the hot and cold points of the steel coil will be too large, which will increase the thermal stress and thus damage the magnetism and shape of the steel strip.

[0007] The steel coil is forcibly cooled from 1080℃ to ~700℃ in the second cooling section 917. The cooling rate should not be too fast, usually controlled within 25℃ / h, otherwise the edge waviness of the steel coil will increase.

[0008] In the third cooling section 918, the steel coil is forcibly cooled from 700℃ to ~450℃. Since it is in a low temperature stage, the cooling rate can be appropriately increased, usually controlled below 30℃ / h.

[0009] In the fourth cooling section 919, the steel coil is subjected to forced cooling and natural cooling inside the inner shroud after exiting the furnace, so that the steel coil is cooled to below ~300℃ when the shroud is opened.

[0010] Rapid and accurate control of the cooling temperature and cooling rate in the aforementioned cooling section is key to obtaining high-quality grain-oriented silicon steel coils. Utility Model Content

[0011] To more quickly and accurately control the cooling temperature and cooling rate in the second cooling section, this invention provides an in-furnace cooling system and an in-furnace. The in-furnace cooling system includes an indirect radiant cooling pipe at the furnace top, a cooling air pipe on the inner periphery of the furnace, and a cooling air pipe on the outer periphery of the furnace. When the in-furnace cooling system is used in the second cooling section, it can more quickly and accurately control the cooling temperature and cooling rate in the second cooling section.

[0012] The technical solution adopted by this utility model embodiment to solve its technical problem is:

[0013] A ring furnace internal cooling system includes a main air supply pipe, a top air supply pipe, a side air supply pipe, a top indirect radiant cooling pipe, an inner peripheral cooling blower pipe, an outer peripheral cooling blower pipe, and an exhaust pipe. The inlet ends of the top air supply pipe and the side air supply pipe are both connected to the main air supply pipe. The inlet end of the top indirect radiant cooling pipe is connected to the top air supply pipe, and the outlet end of the top indirect radiant cooling pipe is connected to the exhaust pipe. A portion of the top indirect radiant cooling pipe is located in the upper part of the furnace chamber of the ring furnace. The inlet ends of the inner peripheral cooling blower pipe and the outer peripheral cooling blower pipe are both connected to the side air supply pipe. The outlet end of the inner peripheral cooling blower pipe is connected to the inner peripheral sidewall of the ring furnace, and the outlet end of the outer peripheral cooling blower pipe is connected to the outer peripheral sidewall of the ring furnace.

[0014] The internal cooling system of the annular furnace corresponds one-to-one with the material level on the second cooling section of the annular furnace. The main air supply pipe, the main air supply pipe at the top of the furnace, the main air supply pipe at the side of the furnace, and the exhaust pipe are all located outside the furnace body of the annular furnace. The main air supply pipe and the main air supply pipe at the top of the furnace both extend along the diameter of the annular furnace.

[0015] The main air supply pipe is equipped with a first flow detection device and a first flow regulation device, the main air supply pipe at the top of the furnace is equipped with a first regulating valve, and the main air supply pipe at the side of the furnace is equipped with a second flow detection device and a second flow regulation device.

[0016] Multiple indirect radiant cooling pipes at the top of the furnace are arranged at intervals along the diameter of the annular furnace. From the inlet end to the outlet end of the indirect radiant cooling pipes at the top of the furnace, each indirect radiant cooling pipe contains a supply air pipe section, an in-furnace radiant cooling pipe section, and an exhaust air pipe section connected in sequence. The in-furnace radiant cooling pipe section is located in the upper part of the furnace chamber of the annular furnace and extends circumferentially along the annular furnace. The in-furnace radiant cooling pipe section is directly opposite the material level on the second cooling section of the annular furnace.

[0017] Both the air supply duct section and the exhaust duct section are vertical and are arranged at intervals along the circumference of the annular furnace. The air supply duct section is equipped with a second regulating valve and a first expansion joint, and the exhaust duct section is equipped with a first expansion joint.

[0018] A portion of the inner peripheral cooling air blower is located on the inner peripheral side of the furnace body of the annular furnace, and a portion of the outer peripheral cooling air blower is located on the outer peripheral side of the furnace body of the annular furnace. A third regulating valve is provided on a portion of the inner peripheral cooling air blower, and a fourth regulating valve is provided on a portion of the outer peripheral cooling air blower.

[0019] Along the vertical direction, the outlet ends of the inner and outer peripheral cooling air blowers are both located in the middle of the protective cover inside the annular furnace; along the circumference of the annular furnace, the outlet ends of the inner and outer peripheral cooling air blowers are both located between two adjacent material levels on the second cooling section, with the outlet end of the inner peripheral cooling air blower facing the outer peripheral sidewall and the outlet end of the outer peripheral cooling air blower facing the inner peripheral sidewall.

[0020] The exhaust duct is equipped with a second expansion joint, and the exhaust duct extends along the diameter of the annular furnace.

[0021] The furnace cooling system of the annular furnace also includes a furnace top exhaust pipe. Along the diameter of the annular furnace, the furnace top exhaust pipe is located at both ends of the furnace top. Gas in the furnace can be discharged through the furnace top exhaust pipe. A fifth regulating valve is installed on the furnace top exhaust pipe.

[0022] An annular furnace includes a furnace body and the aforementioned annular furnace internal cooling system. The furnace body contains a first cooling section, a second cooling section, a third cooling section, and a fourth cooling section arranged sequentially. The annular furnace internal cooling system corresponds one-to-one with the material level on the second cooling section of the annular furnace, and the annular furnace internal cooling system is capable of cooling at least the second cooling section.

[0023] The beneficial effects of this utility model embodiment are: the indirect radiant cooling pipe at the top of the annular furnace, the cooling air pipe on the inner periphery of the furnace, and the cooling air pipe on the outer periphery of the furnace, when the annular furnace cooling system is used in the second cooling section, can more quickly and accurately control the cooling temperature and cooling speed in the second cooling section. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0025] Figure 1 This is a top view of the annular furnace.

[0026] Figure 2 This is an enlarged schematic diagram of the second and third cooling sections.

[0027] Figure 3 This is a schematic diagram showing the connection between the furnace top air supply main pipe, furnace side air supply main pipe, furnace top indirect radiant cooling pipe, furnace inner peripheral cooling blower pipe and furnace outer peripheral cooling blower pipe in the furnace cooling system of the annular furnace described in this embodiment of the utility model.

[0028] Figure 4 This is a schematic diagram showing the connection between the indirect radiant cooling pipe at the top of the furnace and the main exhaust pipe in the annular furnace cooling system described in this embodiment of the utility model.

[0029] Figure 5 This is a schematic diagram of the indirect radiant cooling pipe at the top of the furnace in the internal cooling system of the annular furnace described in this embodiment of the present invention.

[0030] The following are the descriptions of the reference numerals:

[0031] 1. Main air supply pipe; 2. Main air supply pipe at the furnace top; 3. Main air supply pipe at the furnace side; 4. Indirect radiant cooling pipe at the furnace top; 5. Cooling air blowing pipe on the inner perimeter of the furnace; 6. Cooling air blowing pipe on the outer perimeter of the furnace; 7. Main exhaust pipe; 8. Exhaust pipe at the furnace top; 9. Annular furnace;

[0032] 11. First flow detection device; 12. First flow regulation device;

[0033] 21. First regulating valve;

[0034] 31. Second flow detection device; 32. Second flow regulation device;

[0035] 41. Air supply duct section; 42. Furnace radiant cooling duct section; 43. Exhaust duct section; 44. Second regulating valve; 45. First expansion joint;

[0036] 51. Third regulating valve;

[0037] 61. Fourth regulating valve;

[0038] 71. Second expansion joint;

[0039] 81. Fifth regulating valve;

[0040] 91. Furnace chamber; 92. Inner peripheral sidewall; 93. Outer peripheral sidewall; 94. Material level; 95. Furnace body; 96. Protective cover; 97. Furnace top; 98. Rotating furnace bottom; 99. Steel structure; 911. Loading and unloading section; 912. Preheating section; 913. First homogenization section; 914. Heating section; 915. Second homogenization section; 916. First cooling section; 917. Second cooling section; 918. Third cooling section; 919. Fourth cooling section. Detailed Implementation

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] For ease of understanding and description, the following description of this utility model uses absolute positional relationships. Unless otherwise specified, the directional word "above" indicates... Figure 3 The direction above, the directional word "down" indicates Figure 3 The lower side of the middle, the directional word "left" indicates Figure 3 The left side of the direction, the directional word "right" indicates Figure 3 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 3 The direction of the paper and pointing inwards from the paper; the directional word "back" indicates perpendicular to the paper. Figure 3 The orientation of the paper is pointed outwards from the paper surface. This invention is described from the perspective of a reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the dimensions and angles of the components, those skilled in the art can determine them specifically based on actual needs or a limited number of experiments.

[0043] like Figures 3 to 5 As shown in the embodiment of this utility model, an internal cooling system for an annular furnace includes a main air supply pipe 1, a top air supply pipe 2, a side air supply pipe 3, a top indirect radiant cooling pipe 4, an inner peripheral cooling air pipe 5, an outer peripheral cooling air pipe 6, and an exhaust pipe 7. The inlet ends of the top air supply pipe 2 and the side air supply pipe 3 are both connected to the main air supply pipe 1. The inlet end of the top indirect radiant cooling pipe 4 is connected to the top air supply pipe 2, and the outlet end of the top indirect radiant cooling pipe 4 is connected to the exhaust pipe 7. A portion of the top indirect radiant cooling pipe 4 is located in the upper part of the furnace chamber 91 of the annular furnace 9. The inlet ends of the inner peripheral cooling air pipe 5 and the outer peripheral cooling air pipe 6 are both connected to the side air supply pipe 3. The outlet end of the inner peripheral cooling air pipe 5 is connected to the inner peripheral side wall 92 of the annular furnace 9, and the outlet end of the outer peripheral cooling air pipe 6 is connected to the outer peripheral side wall 93 of the annular furnace 9.

[0044] The annular furnace internal cooling system is mainly used to cool the second cooling section 917. The annular furnace internal cooling system corresponds one-to-one with the material level 94 on the second cooling section 917 of the annular furnace 9, and can cool the protective cover 96 on the material level 94 on the second cooling section 917 of the annular furnace 9. The air supply main 1, the furnace top air supply main 2, the furnace side air supply main 3, and the exhaust main 7 are all located outside the furnace body 95 of the annular furnace 9, and the air supply main 1, the furnace top air supply main 2, and the furnace side air supply main 3 all extend along the diameter direction of the annular furnace 9.

[0045] like Figures 3 to 5 As shown, the main air supply pipe 1 is equipped with a first flow detection device 11 and a first flow regulating device 12, and the main air supply pipe 2 at the furnace top is equipped with a first regulating valve 21. The regulating valve can be an existing manual regulating valve, electric regulating valve, or pneumatic regulating valve. The main air supply pipe 3 at the furnace side is equipped with a second flow detection device 31 and a second flow regulating device 32.

[0046] Multiple indirect radiant cooling pipes 4 at the top of the furnace are arranged at intervals along the diameter of the annular furnace 9. From the inlet end to the outlet end of the indirect radiant cooling pipe 4 at the top of the furnace, the indirect radiant cooling pipe 4 at the top of the furnace contains a supply air pipe section 41, an in-furnace radiant cooling pipe section 42 and an exhaust air pipe section 43 connected in sequence. The in-furnace radiant cooling pipe section 42 is located inside the furnace chamber 91 of the annular furnace 9 and is located at the upper part of the furnace chamber 91 of the annular furnace 9.

[0047] The inlet end of the furnace radiant cooling pipe section 42 is connected to the furnace top air supply main 2 via the air supply pipe section 41, and the outlet end of the furnace radiant cooling pipe section 42 is connected to the exhaust main 7 via the exhaust pipe section 43. The furnace radiant cooling pipe section 42 is located directly above the protective cover 96 and extends circumferentially along the annular furnace 9. The furnace radiant cooling pipe section 42 is vertically aligned with the material level 94 on the second cooling section 917 of the annular furnace 9. The air supply pipe section 41 is bolted to the steel structure 99 of the furnace top 97, and the exhaust pipe section 43 is placed on the steel structure 99 of the furnace top 97.

[0048] like Figures 3 to 5 As shown, both the air supply pipe section 41 and the exhaust pipe section 43 are in an upright state. Both the air supply pipe section 41 and the exhaust pipe section 43 pass through the furnace top 97 of the annular furnace 9. The air supply pipe section 41 and the exhaust pipe section 43 are arranged at intervals along the circumference of the annular furnace 9. The air supply pipe section 41 is equipped with a second regulating valve 44 and a first expansion joint 45, and the exhaust pipe section 43 is equipped with a first expansion joint 45.

[0049] Both the inner peripheral cooling air pipe 5 and the outer peripheral cooling air pipe 6 are located outside the furnace body 95. Both the inner peripheral cooling air pipe 5 and the outer peripheral cooling air pipe 6 are bolted to the steel structure 99 of the furnace body 95. A part of the inner peripheral cooling air pipe 5 is located on the inner peripheral side of the furnace body 95 of the annular furnace 9, and a part of the outer peripheral cooling air pipe 6 is located on the outer peripheral side of the furnace body 95 of the annular furnace 9. A third regulating valve 51 is provided on a part of the inner peripheral cooling air pipe 5, and a fourth regulating valve 61 is provided on a part of the outer peripheral cooling air pipe 6.

[0050] like Figures 3 to 5 As shown, along the vertical direction, the outlet ends of the inner peripheral cooling air blower 5 and the outer peripheral cooling air blower 6 are both located in the middle of the protective cover 96 inside the annular furnace 9; along the circumference of the annular furnace 9, the outlet ends of the inner peripheral cooling air blower 5 and the outer peripheral cooling air blower 6 are both located between two adjacent material levels 94 on the second cooling section 917, with the outlet end of the inner peripheral cooling air blower 5 facing the outer peripheral sidewall 93 and the outlet end of the outer peripheral cooling air blower 6 facing the inner peripheral sidewall 92.

[0051] A second expansion joint 71 is installed on the exhaust main pipe 7, which extends along the diameter of the annular furnace 9. Simultaneously, to discharge the cooling air injected into the furnace from the side cooling ducts, the annular furnace cooling system also includes a furnace top exhaust pipe 8. The furnace top exhaust pipe 8 is located outside the furnace body 95, along the diameter of the annular furnace 9, at both ends of the furnace top 97. Gas inside the furnace chamber 91 can be discharged through the furnace top exhaust pipe 8, which can also discharge a small amount of hot air into the workshop to maintain pressure balance inside the furnace. A fifth regulating valve 81 is installed on the furnace top exhaust pipe 8.

[0052] The following describes an annular furnace, which includes a furnace body 95 and multiple annular furnace internal cooling systems as described above. The furnace body 95 contains a first cooling section 916, a second cooling section 917, a third cooling section 918, and a fourth cooling section 919 arranged sequentially. The annular furnace internal cooling system is capable of cooling the second cooling section 917. The annular furnace internal cooling system corresponds one-to-one with the material level 94 on the second cooling section 917 of the annular furnace 9.

[0053] like Figures 3 to 5 As shown, the furnace body 95 also includes a furnace chamber 91, an inner peripheral side wall 92, an outer peripheral side wall 93, a material level 94, a furnace top 97, and a rotating furnace bottom 98. The annular furnace also includes a main air supply pipe and a main exhaust pipe. The main air supply pipe 1 is connected to the main air supply pipe, and the main exhaust pipe 7 is connected to the main exhaust pipe. Depending on the needs, the annular furnace internal cooling system can also cool the third cooling section 918.

[0054] The following describes the internal cooling system of the annular furnace and the working process of the annular furnace.

[0055] In the second cooling section 917 of the annular furnace 9, a portion of the cooling air from the main air supply pipe 1 enters the top air supply pipe 2, and another portion enters the side air supply pipe 3. The cooling air from the top air supply pipe 2 enters the exhaust pipe 7 via the top indirect radiant cooling pipe 4. The top indirect radiant cooling pipe 4 cools the upper part of the furnace 91 through indirect cooling. The top indirect radiant cooling pipe 4 uses centralized exhaust, which is collected and enters the main exhaust pipe and discharged outside the plant. The cooling air from the side air supply pipe 3 is blown into the furnace 91 through the inner peripheral cooling blower 5 and the outer peripheral cooling blower 6, cooling the furnace 91 through direct cooling. The gas inside the furnace 91 can be discharged through the top exhaust pipe 8, that is, the cooling air inside the furnace is discharged outside the furnace and directly discharged into the plant.

[0056] The ring furnace cooling system and the ring furnace itself can help achieve large-scale continuous production of high-temperature annealing of grain-oriented silicon steel coils, enabling the steel coils to automatically complete the cooling heat treatment process inside the furnace, thereby meeting the strict process requirements for temperature control during the high-temperature annealing of grain-oriented silicon steel.

[0057] The annular furnace cooling system and the annular furnace itself possess excellent adaptability and flexibility, capable of meeting the production needs of different specifications and types of grain-oriented silicon steel coils. By precisely controlling the furnace temperature and cooling rate, it is ensured that each batch of steel coils meets consistent high-quality standards. Simultaneously, due to the high degree of automation, the workload of operators is significantly reduced, and safety hazards during the production process are correspondingly minimized.

[0058] The ring furnace cooling system and the ring furnace itself not only improve the production efficiency of high-temperature annealing of grain-oriented silicon steel, but also automatically and precisely control the cooling rate by adjusting the cooling airflow at the top and sides, significantly improving product quality and the safety of the production process.

[0059] The above description is merely a specific embodiment of this utility model and should not be construed as limiting the scope of its implementation. Therefore, any substitution of equivalent components or equivalent changes and modifications made within the scope of protection of this utility model should still fall within its coverage. Furthermore, the technical features, technical solutions, and embodiments of this utility model can be freely combined and used.

Claims

1. A cooling system for an annular furnace, characterized in that, The annular furnace cooling system includes a main air supply pipe (1), a furnace top main air supply pipe (2), a furnace side main air supply pipe (3), a furnace top indirect radiant cooling pipe (4), a furnace inner peripheral cooling blower pipe (5), a furnace outer peripheral cooling blower pipe (6), and an exhaust main pipe (7). The inlet ends of the furnace top main air supply pipe (2) and the furnace side main air supply pipe (3) are both connected to the main air supply pipe (1). The inlet end of the furnace top indirect radiant cooling pipe (4) is connected to the furnace top main air supply pipe (2). The outlet end of the furnace is connected to the exhaust pipe (7). A part of the furnace top indirect radiation cooling pipe (4) is located in the upper part of the furnace chamber (91) of the ring furnace (9). The inlet end of the furnace inner peripheral cooling blow pipe (5) and the inlet end of the furnace outer peripheral cooling blow pipe (6) are both connected to the furnace side air supply pipe (3). The outlet end of the furnace inner peripheral cooling blow pipe (5) is connected to the inner peripheral side wall (92) of the ring furnace (9), and the outlet end of the furnace outer peripheral cooling blow pipe (6) is connected to the outer peripheral side wall (93) of the ring furnace (9).

2. The annular furnace cooling system according to claim 1, characterized in that, The internal cooling system of the annular furnace corresponds one-to-one with the material level (94) on the second cooling section (917) of the annular furnace (9). The main air supply pipe (1), the main air supply pipe at the top of the furnace (2), the main air supply pipe at the side of the furnace (3) and the exhaust pipe (7) are all located outside the furnace body (95) of the annular furnace (9). The main air supply pipe (1) and the main air supply pipe at the top of the furnace (2) both extend along the diameter direction of the annular furnace (9).

3. The annular furnace cooling system according to claim 1, characterized in that, The main air supply pipe (1) is equipped with a first flow detection device (11) and a first flow regulation device (12), the main air supply pipe at the top of the furnace (2) is equipped with a first regulating valve (21), and the main air supply pipe at the side of the furnace (3) is equipped with a second flow detection device (31) and a second flow regulation device (32).

4. The annular furnace cooling system according to claim 1, characterized in that, Multiple indirect radiant cooling pipes (4) are arranged at intervals along the diameter of the annular furnace (9). Along the direction from the inlet end of the indirect radiant cooling pipe (4) to the outlet end of the indirect radiant cooling pipe (4), the indirect radiant cooling pipe (4) contains a supply air pipe section (41), an in-furnace radiant cooling pipe section (42), and an exhaust air pipe section (43) connected in sequence. The in-furnace radiant cooling pipe section (42) is located in the upper part of the furnace chamber (91) of the annular furnace (9). The in-furnace radiant cooling pipe section (42) extends along the circumference of the annular furnace (9). The in-furnace radiant cooling pipe section (42) is directly opposite the material level (94) on the second cooling section (917) of the annular furnace (9).

5. The annular furnace cooling system according to claim 4, characterized in that, Both the air supply pipe section (41) and the exhaust pipe section (43) are in a vertical state. The air supply pipe section (41) and the exhaust pipe section (43) are arranged at intervals along the circumference of the ring furnace (9). The air supply pipe section (41) is equipped with a second regulating valve (44) and a first expansion joint (45), and the exhaust pipe section (43) is equipped with a first expansion joint (45).

6. The annular furnace cooling system according to claim 1, characterized in that, A portion of the furnace inner peripheral cooling air blower (5) is located on the inner peripheral side of the furnace body (95) of the annular furnace (9), and a portion of the furnace outer peripheral cooling air blower (6) is located on the outer peripheral side of the furnace body (95) of the annular furnace (9). A third regulating valve (51) is provided on a portion of the furnace inner peripheral cooling air blower (5), and a fourth regulating valve (61) is provided on a portion of the furnace outer peripheral cooling air blower (6).

7. The annular furnace cooling system according to claim 1, characterized in that, Along the vertical direction, the outlet end of the furnace inner peripheral cooling blower (5) and the outlet end of the furnace outer peripheral cooling blower (6) are both located in the middle of the protective cover (96) inside the annular furnace (9); along the circumference of the annular furnace (9), the outlet end of the furnace inner peripheral cooling blower (5) and the outlet end of the furnace outer peripheral cooling blower (6) are both located between two adjacent material positions (94) on the second cooling section (917), the outlet end of the furnace inner peripheral cooling blower (5) faces the outer peripheral sidewall (93), and the outlet end of the furnace outer peripheral cooling blower (6) faces the inner peripheral sidewall (92).

8. The annular furnace cooling system according to claim 2, characterized in that, The exhaust pipe (7) is provided with a second expansion joint (71), and the exhaust pipe (7) extends along the diameter direction of the annular furnace (9).

9. The annular furnace cooling system according to claim 1, characterized in that, The furnace cooling system of the annular furnace also includes a furnace top exhaust pipe (8). Along the diameter direction of the annular furnace (9), the furnace top exhaust pipe (8) is located at both ends of the furnace top (97) of the annular furnace (9). The gas in the furnace chamber (91) can be discharged through the furnace top exhaust pipe (8). A fifth regulating valve (81) is provided on the furnace top exhaust pipe (8).

10. A ring furnace, characterized in that, The annular furnace includes a furnace body (95) and an internal cooling system for the annular furnace as described in claim 1. The furnace body (95) contains a first cooling section (916), a second cooling section (917), a third cooling section (918), and a fourth cooling section (919) arranged sequentially. The internal cooling system of the annular furnace corresponds one-to-one with the material level (94) on the second cooling section (917) of the annular furnace (9). The internal cooling system of the annular furnace is capable of cooling at least the second cooling section (917).

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