Annular furnace

Abstract

The utility model discloses an annular furnace, which 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 four cooling sections, the annular furnace (9) comprises a first cooling section heat compensation device (1), a second cooling section cooling device (2), a third cooling section cooling device (3) and a fourth cooling section cooling device (4), according to the annular furnace, the cooling temperature and the cooling speed in the four cooling sections can be more rapidly and accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment equipment technology, specifically a ring furnace. 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 four cooling sections, this invention provides a ring furnace, which includes a first cooling section reheating device, a second cooling section cooling device, a third cooling section cooling device, and a fourth cooling section cooling device, enabling more rapid and accurate control of the cooling temperature and cooling rate in the four cooling sections.

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

[0013] An annular furnace includes a furnace body comprising a fixed shell and a rotating furnace bottom. The furnace body also includes a first cooling section, a second cooling section, a third cooling section, and a fourth cooling section arranged sequentially. The annular furnace further includes a first cooling section heat replenishment device, a second cooling section cooling device, a third cooling section cooling device, and a fourth cooling section cooling device. The first cooling section heat replenishment device can provide heat to the first cooling section, the second cooling section cooling device can reduce the heat in the second cooling section, the third cooling section cooling device can reduce the heat in the third cooling section, and the fourth cooling section cooling device can spray cooling gas onto a protective cover on the fourth cooling section.

[0014] The first cooling section heating device includes a burner and a fuel supply line connected in sequence. The burner is located between two circumferentially adjacent material levels in the first cooling section, and the burner is located on the inner and outer circumferential sidewalls of the fixed housing. The burner is capable of injecting flames into the first cooling section.

[0015] The second cooling section's cooling device corresponds one-to-one with the material level on the second cooling section of the annular furnace. The second cooling section's cooling device includes a second-section main air supply pipe, a second-section top air supply pipe, a second-section side air supply pipe, a second-section top indirect radiant cooling pipe, a second-section inner circumferential cooling blower pipe, a second-section outer circumferential cooling blower pipe, and a second-section exhaust pipe. The inlet ends of the second-section top air supply pipe and the second-section side air supply pipe are both connected to the second-section main air supply pipe. The inlet end of the second-section top indirect radiant cooling pipe is connected to... The second section of the furnace top air supply main pipe is connected, the outlet end of the second section of the furnace top indirect radiant cooling pipe is connected to the second section of the exhaust main pipe, a part of the second section of the furnace top indirect radiant cooling pipe is located in the upper part of the furnace chamber of the annular furnace, the inlet end of the second section of the furnace inner peripheral cooling blower and the inlet end of the second section of the furnace outer peripheral cooling blower are both connected to the second section of the furnace side air supply main pipe, the outlet end of the second section of the furnace inner peripheral cooling blower is connected to the inner peripheral side wall of the annular furnace, and the outlet end of the second section of the furnace outer peripheral cooling blower is connected to the outer peripheral side wall of the annular furnace.

[0016] The second section of the furnace top air supply main pipe is equipped with a second section first regulating valve. Multiple second section furnace top indirect radiant cooling pipes are arranged at intervals along the diameter of the annular furnace. From the inlet end to the outlet end of the second section furnace top indirect radiant cooling pipe, the second section furnace top indirect radiant cooling pipe contains an air supply pipe section, an in-furnace radiant cooling pipe section and an exhaust 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 along the circumference of the annular furnace. The in-furnace radiant cooling pipe section is vertically aligned with the material level on the second cooling section of the annular furnace. The air supply pipe section is equipped with a second section second regulating valve.

[0017] A portion of the second section of the furnace inner peripheral cooling air blower is located on the inner peripheral side of the furnace body, and a portion of the second section of the furnace outer peripheral cooling air blower is located on the outer peripheral side of the furnace body. A second section of the third regulating valve is installed on a portion of the second section of the furnace inner peripheral cooling air blower, and a second section of the fourth regulating valve is installed on a portion of the second section of the furnace outer peripheral cooling air blower. Along the vertical direction, the outlet ends of the second section of the furnace inner peripheral cooling air blower and the second section of the furnace outer peripheral cooling air blower 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 second section of the furnace inner peripheral cooling air blower and the second section of the furnace outer peripheral cooling air blower are both located between two adjacent material levels on the second cooling section. The outlet end of the second section of the furnace inner peripheral cooling air blower faces the outer peripheral sidewall, and the outlet end of the second section of the furnace outer peripheral cooling air blower faces the inner peripheral sidewall.

[0018] The third cooling section cooling device corresponds one-to-one with the material level on the third cooling section of the ring furnace. The third cooling section cooling device includes the third section air supply main pipe, the third section furnace top air supply main pipe, the third section furnace side air supply main pipe, the third section furnace top cooling blower, the third section furnace inner peripheral cooling blower, the third section furnace outer peripheral cooling blower, and the third section exhaust pipe. The inlet ends of the third section furnace top air supply main pipe and the third section furnace side air supply main pipe are both connected to the third section air supply main pipe. The inlet end of the third section furnace top cooling blower is connected to the third section furnace top air supply main pipe. The outlet end of the third section furnace top cooling blower is connected to the furnace top. The inlet ends of the third section furnace inner peripheral cooling blower and the third section furnace outer peripheral cooling blower are both connected to the third section furnace side air supply main pipe. The outlet end of the third section furnace inner peripheral cooling blower is connected to the inner peripheral side wall of the ring furnace. The outlet end of the third section furnace outer peripheral cooling blower is connected to the outer peripheral side wall of the ring furnace.

[0019] The third section of the furnace top air supply main pipe is equipped with a third section first regulating valve. Multiple third section furnace top cooling air pipes are arranged at intervals along the diameter of the ring furnace. The third section furnace top cooling air pipes are in an upright state, with the outlet end of the third section furnace top cooling air pipes facing downwards. The third section furnace top cooling air pipes are directly aligned with the material level on the second cooling section of the ring furnace. The third section furnace top cooling air pipes are equipped with a third section second regulating valve.

[0020] A portion of the third section of the furnace 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 third section of the furnace 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 installed on a portion of the third section of the furnace inner peripheral cooling air blower, and a fourth regulating valve is installed on a portion of the third section of the furnace outer peripheral cooling air blower. Along the vertical direction, the outlet ends of both the third section of the furnace inner peripheral cooling air blower and the third section of the furnace outer peripheral cooling air blower are located in the middle of the protective cover inside the annular furnace. Along the circumference of the annular furnace, the outlet ends of both the third section of the furnace inner peripheral cooling air blower and the third section of the furnace outer peripheral cooling air blower are located between two adjacent material levels on the third cooling section. The outlet end of the third section of the furnace inner peripheral cooling air blower faces the outer peripheral sidewall, and the outlet end of the third section of the furnace outer peripheral cooling air blower faces the inner peripheral sidewall.

[0021] The fourth cooling section cooling device corresponds one-to-one with the material level on the fourth cooling section of the ring furnace. The fourth cooling section cooling device includes the fourth section air supply main pipe, the fourth section top cooling air blower, the fourth section inner circumferential cooling air blower, and the fourth section outer circumferential cooling air blower. The inlet ends of the fourth section top cooling air blower, the fourth section inner circumferential cooling air blower, and the fourth section outer circumferential cooling air blower are all connected to the fourth section air supply main pipe. The fourth section top cooling air blower is located above the protective cover of the fourth cooling section and can spray cooling gas onto the top wall of the protective cover on the fourth cooling section. The fourth section inner circumferential cooling air blower is located on the inner circumference of the fourth cooling section and can spray cooling gas onto the circumferential wall of the inner protective cover of the fourth cooling section. The fourth section outer circumferential cooling air blower is located on the outer circumference of the fourth cooling section and can spray cooling gas onto the circumferential wall of the outer protective cover of the fourth cooling section.

[0022] The fourth section of the main air supply pipe includes an upper section and a lower section connected in sequence. The upper and lower sections are spaced apart vertically. The upper section is equipped with a fourth section flow detection device and a fourth section flow regulation device. The top cooling air duct, the inner circumferential cooling air duct, and the outer circumferential cooling air duct of the fourth section are all connected to the lower section of the main pipe. The lower section of the main pipe is located above the top cooling air duct, the inner circumferential cooling air duct, and the outer circumferential cooling air duct of the fourth section.

[0023] Multiple fourth-section top cooling air blowers are arranged at intervals along the diameter of the annular furnace. From the inlet end to the outlet end of the fourth-section top cooling air blower, each fourth-section top cooling air blower comprises an upper vertical section and a lower horizontal section connected sequentially. The upper vertical section extends vertically and is equipped with a fourth-section first regulating valve. The lower horizontal section extends circumferentially along the annular furnace, with the lower end of the upper vertical section connected to the lower horizontal section. Multiple lower air blower branch pipes are connected below the lower horizontal section, extending circumferentially along the annular furnace at intervals. These branch pipes are upright, with their outlet ends facing downwards. The inlet end of the fourth-section inner circumferential cooling air blower is connected to the inner end of the lower section of the main pipe, and a fourth-section second regulating valve is installed on the inner circumferential cooling air blower. The inlet end of the fourth-section outer circumferential cooling air blower is connected to the outer end of the lower section of the main pipe, and a fourth-section third regulating valve is installed on the outer circumferential cooling air blower.

[0024] The beneficial effects of this utility model embodiment are: the ring furnace includes a first cooling section reheating device, a second cooling section cooling device, a third cooling section cooling device and a fourth cooling section cooling device, which can more quickly and accurately control the cooling temperature and cooling rate in the four cooling sections. Attached Figure Description

[0025] 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.

[0026] Figure 1 This is a top view of the annular furnace.

[0027] Figure 2 This is an enlarged schematic diagram of the second and third cooling sections.

[0028] Figure 3 This is a schematic diagram of the first cooling section heat replenishment device in an embodiment of this utility model.

[0029] Figure 4 This is a schematic diagram showing the connection between the second section of the air supply main pipe, the second section of the furnace top air supply main pipe, and the second section of the furnace side air supply main pipe in this embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of the connection of the second exhaust main pipe in an embodiment of this utility model.

[0031] Figure 6 This is a schematic diagram of the second section of the indirect radiant cooling pipe at the top of the furnace.

[0032] Figure 7 This is a schematic diagram showing the connection of the third section of the air supply main pipe, the third section of the furnace top air supply main pipe, and the third section of the furnace side air supply main pipe in this embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the connection of the third section of the exhaust pipe in this embodiment of the present invention.

[0034] Figure 9 This is a schematic diagram showing the connection of the fourth section air supply pipe, the fourth section top cooling air blower, the fourth section inner peripheral cooling air blower, and the fourth section outer peripheral cooling air blower in this embodiment of the present invention.

[0035] Figure 10 This is a schematic diagram of the fourth section of the top cooling air duct in this embodiment of the present invention.

[0036] The annotations in the attached figures are explained as follows:

[0037] 1. First cooling section reheating device; 2. Second cooling section cooling device; 3. Third cooling section cooling device; 4. Fourth cooling section cooling device; 9. Annular furnace;

[0038] 11. Burner; 12. Fuel supply line;

[0039] 21. Second-section main air supply pipe; 22. Second-section main air supply pipe at the furnace top; 23. Second-section main air supply pipe at the furnace side; 24. Second-section indirect radiant cooling pipe at the furnace top; 25. Second-section inner circumferential cooling air blowing pipe; 26. Second-section outer circumferential cooling air blowing pipe; 27. Second-section main exhaust pipe; 28. Second-section exhaust pipe at the furnace top;

[0040] 211. Second-stage first flow detection device; 212. Second-stage first flow regulation device;

[0041] 221. The first regulating valve of the second section;

[0042] 231. Second-stage second flow detection device; 232. Second-stage second flow regulation device;

[0043] 241. Air supply duct section; 242. Furnace radiant cooling duct section; 243. Exhaust duct section; 244. Second regulating valve of the second section; 245. First expansion joint of the second section;

[0044] 251. Second stage, third regulating valve; 261. Second stage, fourth regulating valve;

[0045] 271. Second expansion joint of the second section; 281. Fifth regulating valve of the second section;

[0046] 31. Third section air supply main pipe; 32. Third section furnace top air supply main pipe; 33. Third section furnace side air supply main pipe; 34. Third section furnace top cooling air blower; 35. Third section furnace inner perimeter cooling air blower; 36. Third section furnace outer perimeter cooling air blower; 37. Third section exhaust pipe;

[0047] 311. Third-stage first flow detection device; 312. Third-stage first flow regulation device;

[0048] 321. The first regulating valve of the third stage;

[0049] 331. Third-stage second flow detection device; 332. Third-stage second flow regulation device;

[0050] 341. Third-stage second regulating valve; 342. Third-stage first expansion joint;

[0051] 351. Third stage, third regulating valve; 361. Third stage, fourth regulating valve;

[0052] 371. The second expansion joint of the third segment;

[0053] 41. Fourth section air supply main pipe; 42. Fourth section top cooling air blower pipe; 43. Fourth section inner circumferential cooling air blower pipe; 44. Fourth section outer circumferential cooling air blower pipe;

[0054] 411. Upper section of main pipe; 412. Lower section of main pipe; 413. Fourth section flow detection device; 414. Fourth section flow regulation device;

[0055] 421. Upper vertical section; 422. Lower horizontal section; 423. First regulating valve of the fourth section; 424. Lower blowing branch pipe;

[0056] 431. Fourth stage, second regulating valve; 441. Fourth stage, third regulating valve;

[0057] 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; 910. Fixed shell; 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;

[0058] 961. Top wall; 962. Peripheral wall. Detailed Implementation

[0059] 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.

[0060] 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.

[0061] The present invention discloses an annular furnace, comprising a furnace body 95, which includes a fixed shell 910 and a rotating furnace bottom 98. The furnace body 95 also includes 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 919 further includes a first cooling section heat replenishment device 1, a second cooling section cooling device 2, a third cooling section cooling device 3, and a fourth cooling section cooling device 4. The first cooling section heat replenishment device 1 can provide heat to the first cooling section 916, the second cooling section cooling device 2 can reduce the heat in the second cooling section 917, the third cooling section cooling device 3 can reduce the heat in the third cooling section 918, and the fourth cooling section cooling device 4 can spray cooling gas onto the protective cover 96 on the fourth cooling section 919.

[0062] like Figure 3 As shown, the first cooling section heating device 1 includes a burner 11 and a fuel supply line 12 connected in sequence. The burner 11 is located between two adjacent material levels 94 in the first cooling section 916 (along the furnace body 95), and the burner 11 is located on the inner peripheral sidewall 92 and outer peripheral sidewall 93 of the fixed housing 910. The burner 11 can spray flames into the first cooling section 916.

[0063] The first stage (i.e., the first cooling section 916) is a high-temperature slow cooling stage, with a cooling rate of 10℃ / h to 15℃ / h. The grain-oriented silicon steel coil is slowly cooled from the process annealing temperature to ~1080℃ using natural cooling within the furnace, with a protective atmosphere circulating inside the inner shroud of the coil. In this stage, the high-temperature steel coil transfers heat to the inner shroud through radiation, which in turn transfers heat to the furnace lining. The furnace lining then dissipates heat to the surrounding environment through radiation and convection. To facilitate control of the cooling rate and prevent small-diameter steel coils from cooling down too quickly, burners 11 for supplemental heating are also required.

[0064] like Figures 4 to 6As shown, the second cooling section cooling device 2 corresponds one-to-one with the material level 94 on the second cooling section 917 of the ring furnace 9. The second cooling section cooling device 2 includes a second section air supply main pipe 21, a second section furnace top air supply main pipe 22, a second section furnace side air supply main pipe 23, a second section furnace top indirect radiant cooling pipe 24, a second section furnace inner peripheral cooling blowing pipe 25, a second section furnace outer peripheral cooling blowing pipe 26, and a second section exhaust main pipe 27. The inlet end of the second section furnace top air supply main pipe 22 and the inlet end of the second section furnace side air supply main pipe 23 are both connected to the second section air supply main pipe 21. The inlet end of the second section furnace top indirect radiant cooling pipe 24 is connected to the second section exhaust main pipe 27. The outlet end of the second-section furnace top air supply pipe 22 is connected to the outlet end of the second-section furnace top indirect radiant cooling pipe 24 and is connected to the second-section exhaust pipe 27. A part of the second-section furnace top indirect radiant cooling pipe 24 is located in the upper part of the furnace chamber 91 of the annular furnace 9. The inlet end of the second-section furnace inner peripheral cooling blower 25 and the inlet end of the second-section furnace outer peripheral cooling blower 26 are both connected to the second-section furnace side air supply pipe 23. The outlet end of the second-section furnace inner peripheral cooling blower 25 is connected to the inner peripheral side wall 92 of the annular furnace 9, and the outlet end of the second-section furnace outer peripheral cooling blower 26 is connected to the outer peripheral side wall 93 of the annular furnace 9.

[0065] The second stage (i.e., the second cooling section 917) is the high-temperature rapid cooling stage, with a cooling rate of 15-25℃ / h. The oriented silicon steel coil is cooled from ~1080℃ to ~700℃ using a forced cooling method of radiant heat exchange through top radiant tubes and convective heat exchange through cold air jets. A protective atmosphere is circulated inside the inner shroud of the steel coil. In this stage, the high-temperature steel coil transfers heat to the inner shroud through radiant heat exchange. The inner shroud then transfers heat to the top radiant tubes, the furnace lining, and the blown-in cold air through radiant and convective heat exchange. The radiant tubes are cooled by the cold air, the furnace lining dissipates heat through self-heating, and the hot air is exhausted outside the furnace.

[0066] The second cooling section cooling device 2 can cool the protective cover 96 on the material level 94 on the second cooling section 917 of the annular furnace 9 in a one-to-one correspondence. The second section air supply main pipe 21, the second section furnace top air supply main pipe 22, the second section furnace side air supply main pipe 23, the second section furnace inner peripheral cooling blower 25, the second section furnace outer peripheral cooling blower 26, and the second section exhaust main pipe 27 are all located outside the furnace body 95 of the annular furnace 9. The second section air supply main pipe 21, the second section furnace top air supply main pipe 22, and the second section furnace side air supply main pipe 23 all extend along the diameter direction of the annular furnace 9.

[0067] like Figures 4 to 6 As shown, the second section of the main air supply pipe 21 is equipped with a second section first flow detection device 211 and a second section first flow regulating device 212. The second section of the furnace top main air supply pipe 22 is equipped with a second section first regulating valve 221. The regulating valve can be an existing manual regulating valve, electric regulating valve, or pneumatic regulating valve. The second section of the furnace side main air supply pipe 23 is equipped with a second section second flow detection device 231 and a second section second flow regulating device 232.

[0068] Multiple second-stage furnace top indirect radiant cooling pipes 24 are arranged at intervals along the diameter direction of the annular furnace 9. From the inlet end to the outlet end of the second-stage furnace top indirect radiant cooling pipe 24, the second-stage furnace top indirect radiant cooling pipe 24 includes a sequentially connected air supply pipe section 241, an in-furnace radiant cooling pipe section 242, and an exhaust pipe section 243. The in-furnace radiant cooling pipe section 242 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.

[0069] The inlet end of the furnace radiant cooling pipe section 242 is connected to the second furnace top air supply main 22 via the air supply pipe section 241, and the outlet end of the furnace radiant cooling pipe section 242 is connected to the second exhaust main 27 via the exhaust pipe section 243. The furnace radiant cooling pipe section 242 is located directly above the protective cover 96 and extends circumferentially along the annular furnace 9. The furnace radiant cooling pipe section 242 is vertically aligned with the material level 94 on the second cooling section 917 of the annular furnace 9. The air supply pipe section 241 is bolted to the steel structure 99 of the furnace top 97, and the exhaust pipe section 243 is placed on the steel structure 99 of the furnace top 97.

[0070] like Figures 4 to 6 As shown, both the air supply duct section 241 and the exhaust duct section 243 are in an upright state. Both the air supply duct section 241 and the exhaust duct section 243 pass through the furnace top 97 of the annular furnace 9. The air supply duct section 241 and the exhaust duct section 243 are arranged at intervals along the circumference of the annular furnace 9. The air supply duct section 241 is equipped with a second section second regulating valve 244 and a second section first expansion joint 245. The exhaust duct section 243 is equipped with a second section first expansion joint 245.

[0071] The second section of the furnace inner peripheral cooling air blower 25 and the second section of the furnace outer peripheral cooling air blower 26 are both located outside the furnace body 95. The second section of the furnace inner peripheral cooling air blower 25 and the second section of the furnace outer peripheral cooling air blower 26 are both bolted to the steel structure 99 of the furnace body 95. A part of the second section of the furnace inner peripheral cooling air blower 25 is located on the inner peripheral side of the furnace body 95 of the annular furnace 9, and a part of the second section of the furnace outer peripheral cooling air blower 26 is located on the outer peripheral side of the furnace body 95 of the annular furnace 9. A second section third regulating valve 251 is provided on a part of the second section of the furnace inner peripheral cooling air blower 25, and a second section fourth regulating valve 261 is provided on a part of the second section of the furnace outer peripheral cooling air blower 26.

[0072] like Figures 4 to 6As shown, along the vertical direction, the outlet end of the second section of the furnace inner peripheral cooling air blower 25 and the outlet end of the second section of the furnace outer peripheral cooling air blower 26 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 second section of the furnace inner peripheral cooling air blower 25 and the outlet end of the second section of the furnace outer peripheral cooling air blower 26 are both located between two adjacent material positions 94 on the second cooling section 917, the outlet end of the second section of the furnace inner peripheral cooling air blower 25 faces the outer peripheral sidewall 93, and the outlet end of the second section of the furnace outer peripheral cooling air blower 26 faces the inner peripheral sidewall 92.

[0073] The second exhaust pipe 27 is equipped with a second expansion joint 271, and 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 second furnace top exhaust pipe 28. Located outside the furnace body 95, the second furnace top exhaust pipe 28 extends along the diameter of the annular furnace 9, situated at both ends of the furnace top 97. Gas within the furnace chamber 91 can be discharged through the second furnace top exhaust pipe 28, which also discharges a small amount of hot air into the workshop to maintain pressure balance within the furnace. A second fifth regulating valve 281 is installed on the second furnace top exhaust pipe 28.

[0074] like Figures 7 to 8 As shown, the third cooling section cooling device 3 corresponds one-to-one with the material level 94 on the third cooling section 918 of the ring furnace 9. The third cooling section cooling device 3 includes a third section air supply main pipe 31, a third section furnace top air supply main pipe 32, a third section furnace side air supply main pipe 33, a third section furnace top cooling blower 34, a third section furnace inner peripheral cooling blower 35, a third section furnace outer peripheral cooling blower 36, and a third section exhaust pipe 37. The inlet end of the third section furnace top air supply main pipe 32 and the inlet end of the third section furnace side air supply main pipe 33 are both connected to the third section air supply main pipe 318. 1. The inlet end of the third-section furnace top cooling air blower 34 is connected to the third-section furnace top air supply main 32, and the outlet end of the third-section furnace top cooling air blower 34 is connected to the furnace top 97. The inlet ends of the third-section furnace inner peripheral cooling air blower 35 and the third-section furnace outer peripheral cooling air blower 36 are both connected to the third-section furnace side air supply main 33. The outlet end of the third-section furnace inner peripheral cooling air blower 35 is connected to the inner peripheral side wall 92 of the annular furnace 9, and the outlet end of the third-section furnace outer peripheral cooling air blower 36 is connected to the outer peripheral side wall 93 of the annular furnace 9.

[0075] The third stage (i.e., the third cooling section 918) is the medium-temperature rapid cooling stage, with a cooling rate of 20-30℃ / h. The oriented silicon steel coil is cooled from ~700℃ to ~450℃, mainly using forced cooling through jet-blown convection heat transfer. A protective atmosphere is circulated inside the inner shroud of the steel coil. In this stage, the high-temperature steel coil transfers heat to the inner shroud through radiation heat transfer. The inner shroud then transfers heat to the furnace lining and the blown-in cold air through radiation and convection heat transfer. The furnace lining dissipates heat through self-heating, and the hot air is exhausted outside the furnace.

[0076] like Figures 7 to 8 As shown, the third section air supply main pipe 31 is equipped with a third section first flow detection device 311 and a third section first flow regulation device 312. The third section furnace top air supply main pipe 32 is equipped with a third section first regulating valve 321. The third section furnace side air supply main pipe 33 is equipped with a third section second flow detection device 331 and a third section second flow regulation device 332. Multiple third section furnace top cooling air pipes 34 are arranged at intervals along the diameter direction of the annular furnace 9. The third section furnace top cooling air pipes 34 are in an upright state, with the outlet end of the third section furnace top cooling air pipes 34 facing downwards. The third section furnace top cooling air pipes 34 are vertically aligned with the material level 94 on the second cooling section 917 of the annular furnace 9. The third section furnace top cooling air pipes 34 are equipped with a third section second regulating valve 341 and a third section first expansion joint 342.

[0077] A portion of the third section of the furnace inner peripheral cooling air blower 35 is located on the inner peripheral side of the furnace body 95 of the annular furnace 9, and a portion of the third section of the furnace outer peripheral cooling air blower 36 is located on the outer peripheral side of the furnace body 95 of the annular furnace 9. A third section third regulating valve 351 is provided on a portion of the third section of the furnace inner peripheral cooling air blower 35, and a third section fourth regulating valve 361 is provided on a portion of the third section of the furnace outer peripheral cooling air blower 36. A third section second expansion joint 371 is provided on the third section exhaust pipe 37.

[0078] Along the vertical direction, the outlet end of the third section furnace inner peripheral cooling air blower 35 and the outlet end of the third section furnace outer peripheral cooling air blower 36 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 third section furnace inner peripheral cooling air blower 35 and the outlet end of the third section furnace outer peripheral cooling air blower 36 are both located between two adjacent material positions 94 on the third cooling section 918, the outlet end of the third section furnace inner peripheral cooling air blower 35 faces the outer peripheral sidewall 93, and the outlet end of the third section furnace outer peripheral cooling air blower 36 faces the inner peripheral sidewall 92.

[0079] To ensure a smoother temperature transition between the second cooling section 917 and the third cooling section 918, a second cooling device 2 is installed at the first material level 94 of the third cooling section 918, and third cooling devices 3 are installed at the second to last material levels 94 of the third cooling section 918, along the direction from the inlet end to the outlet end of the third cooling section 918. For example, a second cooling device 2 is installed at material level 48# 94, and third cooling devices 3 are installed at material levels 49# 94, 50# 94, 51# 94, and 52# 94, with each material level 49# 94, 50# 94, 51# 94, and 52# 94 corresponding to a third cooling device 3.

[0080] like Figures 9 to 10 As shown, the fourth cooling section cooling device 4 corresponds one-to-one with the material level 94 on the fourth cooling section 919 of the ring furnace 9. The fourth cooling section cooling device 4 includes a fourth section air supply main pipe 41, a fourth section top cooling air blower 42, a fourth section inner circumferential cooling air blower 43, and a fourth section outer circumferential cooling air blower 44. The inlet ends of the fourth section top cooling air blower 42, the fourth section inner circumferential cooling air blower 43, and the fourth section outer circumferential cooling air blower 44 are all connected to the fourth section air supply main pipe 41. The fourth section top cooling air blower 42 is located under the protective cover 96 of the fourth cooling section 919. Above, the fourth section top cooling air blower 42 can spray cooling gas onto the top wall 961 of the protective cover 96 on the fourth cooling section 919. The fourth section inner peripheral cooling air blower 43 is located on the inner peripheral side of the fourth cooling section 919 and can spray cooling gas onto the peripheral wall 962 of the protective cover 96 on the inner side of the fourth cooling section 919. The fourth section outer peripheral cooling air blower 44 is located on the outer peripheral side of the fourth cooling section 919 and can spray cooling gas onto the peripheral wall 962 of the protective cover 96 on the outer side of the fourth cooling section 919.

[0081] like Figures 9 to 10 As shown, the fourth stage (i.e., the fourth cooling section 919) is the low-temperature cooling stage, in which the grain-oriented silicon steel coil is cooled from ~450℃ to below ~300℃ using a combination of jet-blown convection heat transfer and natural heat dissipation. During this stage, the steel coil has already exited the furnace. Immediately after exiting the furnace, it is cooled by blowing cold air into the inner shroud of the coil. Nitrogen protective gas is circulated inside the inner shroud. After the protective gas is stopped and the shroud is opened, heat dissipation occurs naturally.

[0082] The fourth cooling section cooling device 4 corresponds one-to-one with the material level 94 on the fourth cooling section 919 of the annular furnace 9. The fourth cooling section cooling device 4 can cool the protective cover 96 on the material level 94 on the fourth cooling section 919 of the annular furnace 9. The fourth section air supply main pipe 41, the fourth section top cooling air pipe 42, the fourth section inner peripheral cooling air pipe 43, and the fourth section outer peripheral cooling air pipe 44 are all located outside the furnace body 95 of the annular furnace 9. The fourth section air supply main pipe 41 extends along the diameter direction of the annular furnace 9.

[0083] The fourth section of the air supply main pipe 41 includes an upper section 411 and a lower section 412 connected in sequence. The upper section 411 and the lower section 412 are arranged at intervals. Both the upper section 411 and the lower section 412 extend along the diameter direction of the annular furnace 9. One end of the upper section 411 is connected to the middle of the lower section 412 (along the diameter direction of the annular furnace 9).

[0084] The upper section 411 of the main pipe is equipped with a fourth flow detection device 413 and a fourth flow regulation device 414. The fourth section top cooling air pipe 42, the fourth section inner circumferential cooling air pipe 43 and the fourth section outer circumferential cooling air pipe 44 are all connected to the lower section 412 of the main pipe. The lower section 412 of the main pipe is located above the fourth section top cooling air pipe 42, the fourth section inner circumferential cooling air pipe 43 and the fourth section outer circumferential cooling air pipe 44. Along the diameter direction of the annular furnace 9, the fourth section top cooling air pipe 42 is located in the middle of the lower section 412 of the main pipe.

[0085] Multiple fourth-section top cooling air blowers 42 are arranged at intervals along the diameter direction of the annular furnace 9. Along the direction from the inlet end of the fourth-section top cooling air blower 42 to the outlet end of the fourth-section top cooling air blower 42, the fourth-section top cooling air blower 42 contains an upper vertical section 421 and a lower horizontal section 422 connected in sequence.

[0086] like Figure 10 As shown, the upper vertical section 421 and the lower horizontal section 422 are connected in an L-shape. The upper vertical section 421 extends in the vertical direction and is equipped with a fourth-section first regulating valve 423. The lower horizontal section 422 extends circumferentially along the annular furnace 9, and the lower end of the upper vertical section 421 is connected to the lower horizontal section 422. The fourth-section first regulating valve 423 can be an existing man-made valve, an electric valve, a pneumatic valve, or a hydraulic valve.

[0087] Multiple downward blowing branch pipes 424 are connected below the lower horizontal section 422. These branch pipes 424 extend circumferentially along the annular furnace 9 and are arranged at intervals. The branch pipes 424 are upright, with their outlet ends facing downwards. The branch pipes 424 are connected to the steel structure 99 of the furnace top 97 by bolts. If there is no steel structure, they are directly suspended from the top of the inner shroud.

[0088] The inlet end of the fourth section inner circumferential cooling air blower 43 is connected to the inner end of the lower section 412 of the main pipe, and the fourth section inner circumferential cooling air blower 43 is equipped with a fourth section second regulating valve 431. The outlet end of the fourth section inner circumferential cooling air blower 43 faces the peripheral wall 962 of the protective cover 96 inside the fourth cooling section 919, and the fourth section inner circumferential cooling air blower 43 is connected to the side steel structure 99 by bolts.

[0089] The inlet end of the fourth peripheral cooling air blower 44 is connected to the outer end of the lower section 412 of the main pipe, and the fourth peripheral cooling air blower 44 is equipped with a fourth third regulating valve 441. The outlet end of the fourth peripheral cooling air blower 44 faces the peripheral wall 962 of the protective cover 96 outside the fourth cooling section 919, and the fourth peripheral cooling air blower 44 is connected to the side steel structure 99 by bolts.

[0090] The furnace body 95 includes a furnace chamber 91, a fixed shell 910, a rotating furnace bottom 98, and a material level 94. The fourth cooling section 919 is located outside the furnace chamber 91. The fixed shell 910 includes an inner peripheral sidewall 92, an outer peripheral sidewall 93, and a furnace top 97. The annular furnace also includes a main air supply pipe and a main exhaust pipe. Each main air supply pipe is connected to the main air supply pipe, and each main exhaust pipe is connected to the main exhaust pipe.

[0091] An annealing and cooling method for grain-oriented silicon steel, wherein the annealing and cooling method for grain-oriented silicon steel employs the aforementioned annular furnace, and the annealing and cooling method for grain-oriented silicon steel includes the following steps:

[0092] The first cooling section heating device 1 provides heat to the first cooling section 916, the second cooling section cooling device 2 reduces the heat in the second cooling section 917, the third cooling section cooling device 3 reduces the heat in the third cooling section 918, and the fourth cooling section cooling device 4 sprays cooling gas onto the protective cover 96 on the fourth cooling section 919.

[0093] In the first cooling section 916 of the ring furnace 9, the burner 11 injects flames into the first cooling section 916 as needed. The fuel supply pipeline 12 is equipped with a regulating valve, which can adjust the amount of heat provided to the first cooling section 916 by the first cooling section heat replenishment device 1.

[0094] In the second cooling section 917 of the annular furnace 9, a portion of the cooling air from the second section air supply main 21 enters the second section furnace top air supply main 22, and another portion enters the second section furnace side air supply main 23. The cooling air from the second section furnace top air supply main 22 passes through the second section furnace top indirect radiant cooling pipe 24 and enters the second section exhaust main 27. The second section furnace top indirect radiant cooling pipe 24 cools the upper part of the furnace 91 through indirect cooling. The second section furnace top indirect radiant cooling pipe 24 uses centralized exhaust, which is collected and enters the main exhaust pipe and is discharged outside the plant. The cooling air from the second section furnace side air supply main 23 is blown into the furnace 91 through the second section furnace inner peripheral cooling blower 25 and the second section furnace outer peripheral cooling blower 26, cooling the furnace 91 through direct cooling. The gas inside the furnace 91 can be discharged through the second section furnace top exhaust pipe 28, that is, the cooling air inside the furnace is discharged outside the furnace and directly discharged into the plant.

[0095] In the third cooling section 918 of the annular furnace 9, a portion of the cooling air in the third section air supply pipe 31 enters the third section furnace top air supply pipe 32, and another portion of the cooling air in the third section air supply pipe 31 enters the third section furnace side air supply pipe 33. The cooling air in the third section furnace top air supply pipe 32 enters the upper part of the cooling furnace 91 through the third section furnace top cooling blower 34, directly cooling the upper part of the furnace 91. The cooling air in the third section furnace side air supply pipe 33 is blown into the furnace 91 through the third section furnace inner peripheral cooling blower 35 and the third section furnace outer peripheral cooling blower 36, directly cooling the furnace 91. The gas in the furnace 91 can be discharged through the second section exhaust pipe 27, which is connected to the furnace body 95 and communicates with the furnace 91.

[0096] In the fourth cooling section 919 of the annular furnace 9, the cooling air in the fourth section air supply pipe 41 enters the fourth section top cooling blower 42, the fourth section inner peripheral cooling blower 43, and the fourth section outer peripheral cooling blower 44. The fourth section top cooling blower 42 sprays cooling gas onto the top wall 961 of the protective cover 96 on the fourth cooling section 919. The fourth section inner peripheral cooling blower 43 sprays cooling gas onto the peripheral wall 962 of the protective cover 96 on the inner side of the fourth cooling section 919. The fourth section outer peripheral cooling blower 44 sprays cooling gas onto the peripheral wall 962 of the protective cover 96 on the outer side of the fourth cooling section 919.

[0097] The aforementioned annular furnace and annealing cooling method for grain-oriented silicon steel can help achieve large-scale continuous production of high-temperature annealing of grain-oriented silicon steel coils. It enables 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.

[0098] The described annular furnace and annealing cooling method for grain-oriented silicon steel offer excellent adaptability and flexibility, capable of meeting the production needs of different specifications and types of grain-oriented silicon steel coils. Precise control of furnace temperature and cooling rate ensures that each batch of steel coils meets consistent high-quality standards. Furthermore, the high degree of automation significantly reduces the workload of operators and correspondingly minimizes safety hazards during production.

[0099] The described ring furnace and annealing cooling method for grain-oriented silicon steel not only improves the production efficiency of high-temperature annealing of grain-oriented silicon steel, but also automatically and precisely controls the cooling rate by adjusting the cooling airflow, thereby rapidly cooling the silicon steel coils after they exit the furnace, significantly improving product quality and the safety of the production process.

[0100] 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.

[0101] 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.

[0102] 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, thereby rapidly cooling the silicon steel coils after they exit the furnace, significantly improving product quality and the safety of the production process.

[0103] 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 ring furnace, the ring furnace (9) comprising a furnace body (95), the furnace body (95) including a fixed shell (910) and a rotating furnace bottom (98), the furnace body (95) further comprising a first cooling section (916), a second cooling section (917), a third cooling section (918) and a fourth cooling section (919) arranged sequentially, characterized in that, The ring furnace (9) also includes a first cooling section heat replenishment device (1), a second cooling section cooling device (2), a third cooling section cooling device (3), and a fourth cooling section cooling device (4). The first cooling section heat replenishment device (1) can provide heat to the first cooling section (916), the second cooling section cooling device (2) can reduce the heat in the second cooling section (917), the third cooling section cooling device (3) can reduce the heat in the third cooling section (918), and the fourth cooling section cooling device (4) can spray cooling gas onto the protective cover (96) on the fourth cooling section (919).

2. The annular furnace according to claim 1, characterized in that, The first cooling section heating device (1) includes a burner (11) and a fuel supply line (12) connected in sequence. The burner (11) is located between two circumferentially adjacent material levels (94) in the first cooling section (916), and the burner (11) is located on the inner circumferential sidewall (92) and outer circumferential sidewall (93) of the fixed housing (910). The burner (11) is capable of injecting flames into the first cooling section (916).

3. The annular furnace according to claim 1, characterized in that, The second cooling section cooling device (2) corresponds one-to-one with the material level (94) on the second cooling section (917) of the ring furnace (9). The second cooling section cooling device (2) includes a second section air supply main pipe (21), a second section furnace top air supply main pipe (22), a second section furnace side air supply main pipe (23), a second section furnace top indirect radiation cooling pipe (24), a second section furnace inner peripheral cooling blower pipe (25), a second section furnace outer peripheral cooling blower pipe (26), and a second section exhaust main pipe (27). The inlet end of the second section furnace top air supply main pipe (22) and the inlet end of the second section furnace side air supply main pipe (23) are both connected to the second section air supply main pipe (21). The inlet end of the second section furnace top indirect radiation cooling pipe (24) is connected to the second section air supply main pipe (21). The outlet end of the second section furnace top air supply pipe (22) is connected to the outlet end of the second section furnace top indirect radiation cooling pipe (24) and the second section exhaust pipe (27). A part of the second section furnace top indirect radiation cooling pipe (24) is located in the upper part of the furnace chamber (91) of the ring furnace (9). The inlet end of the second section furnace inner peripheral cooling blow pipe (25) and the inlet end of the second section furnace outer peripheral cooling blow pipe (26) are both connected to the second section furnace side air supply pipe (23). The outlet end of the second section furnace inner peripheral cooling blow pipe (25) is connected to the inner peripheral side wall (92) of the ring furnace (9). The outlet end of the second section furnace outer peripheral cooling blow pipe (26) is connected to the outer peripheral side wall (93) of the ring furnace (9).

4. The annular furnace according to claim 3, characterized in that, The second section of the furnace top air supply main pipe (22) is equipped with a second section first regulating valve (221). Multiple second section furnace top indirect radiation cooling pipes (24) are arranged at intervals along the diameter direction of the ring furnace (9). The second section furnace top indirect radiation cooling pipe (24) is arranged from the inlet end to the outlet end of the second section furnace top indirect radiation cooling pipe (24). The second section furnace top indirect radiation cooling pipe (24) contains an air supply pipe section (241), a furnace indirect radiation cooling pipe section (242), and an exhaust pipe section (243) connected in sequence. The furnace indirect radiation cooling pipe section (242) is located in the upper part of the furnace chamber (91) of the ring furnace (9). The furnace indirect radiation cooling pipe section (242) extends along the circumference of the ring furnace (9). The furnace indirect radiation cooling pipe section (242) is directly opposite the material level (94) on the second cooling section (917) of the ring furnace (9). The air supply pipe section (241) is equipped with a second section second regulating valve (244).

5. The annular furnace according to claim 3, characterized in that, A portion of the second section of the furnace inner peripheral cooling air blower (25) is located on the inner peripheral side of the furnace body (95) of the annular furnace (9), a portion of the second section of the furnace outer peripheral cooling air blower (26) is located on the outer peripheral side of the furnace body (95) of the annular furnace (9), a second section third regulating valve (251) is provided on a portion of the second section of the furnace inner peripheral cooling air blower (25), and a second section fourth regulating valve (261) is provided on a portion of the second section of the furnace outer peripheral cooling air blower (26); Along the vertical direction, the outlet end of the second section of the furnace inner peripheral cooling blower (25) and the outlet end of the second section of the furnace outer peripheral cooling blower (26) 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 second section of the furnace inner peripheral cooling blower (25) and the outlet end of the second section of the furnace outer peripheral cooling blower (26) are both located between two adjacent material positions (94) on the second cooling section (917), the outlet end of the second section of the furnace inner peripheral cooling blower (25) faces the outer peripheral sidewall (93), and the outlet end of the second section of the furnace outer peripheral cooling blower (26) faces the inner peripheral sidewall (92).

6. The annular furnace according to claim 1, characterized in that, The third cooling section cooling device (3) corresponds one-to-one with the material level (94) on the third cooling section (918) of the ring furnace (9). The third cooling section cooling device (3) includes the third section air supply main pipe (31), the third section furnace top air supply main pipe (32), the third section furnace side air supply main pipe (33), the third section furnace top cooling blower pipe (34), the third section furnace inner peripheral cooling blower pipe (35), the third section furnace outer peripheral cooling blower pipe (36), and the third section exhaust pipe (37). The inlet end of the third section furnace top air supply main pipe (32) and the inlet end of the third section furnace side air supply main pipe (33) are both connected to the third section air supply main pipe (31). The inlet end of the third section furnace top cooling blower (34) is connected to the third section furnace top air supply main pipe (32), the outlet end of the third section furnace top cooling blower (34) is connected to the furnace top (97), the inlet end of the third section furnace inner peripheral cooling blower (35) and the inlet end of the third section furnace outer peripheral cooling blower (36) are both connected to the third section furnace side air supply main pipe (33), the outlet end of the third section furnace inner peripheral cooling blower (35) is connected to the inner peripheral side wall (92) of the ring furnace (9), and the outlet end of the third section furnace outer peripheral cooling blower (36) is connected to the outer peripheral side wall (93) of the ring furnace (9).

7. The annular furnace according to claim 6, characterized in that, The third section of the furnace top air supply main pipe (32) is equipped with a third section first regulating valve (321). Multiple third section furnace top cooling air pipes (34) are arranged at intervals along the diameter direction of the ring furnace (9). The third section furnace top cooling air pipes (34) are in an upright state. The outlet end of the third section furnace top cooling air pipes (34) faces downward. The third section furnace top cooling air pipes (34) and the material level (94) on the third cooling section (918) of the ring furnace (9) are directly opposite each other. The third section furnace top cooling air pipes (34) are equipped with a third section second regulating valve (341).

8. The annular furnace according to claim 6, characterized in that, A portion of the third section of the furnace inner peripheral cooling air blower (35) is located on the inner peripheral side of the furnace body (95) of the annular furnace (9), and a portion of the third section of the furnace outer peripheral cooling air blower (36) is located on the outer peripheral side of the furnace body (95) of the annular furnace (9). A third section third regulating valve (351) is provided on a portion of the third section of the furnace inner peripheral cooling air blower (35), and a third section fourth regulating valve (361) is provided on a portion of the third section of the furnace outer peripheral cooling air blower (36). Along the vertical direction, the outlet end of the third section furnace inner peripheral cooling blower (35) and the outlet end of the third section furnace outer peripheral cooling blower (36) 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 third section furnace inner peripheral cooling blower (35) and the outlet end of the third section furnace outer peripheral cooling blower (36) are both located between two adjacent material positions (94) on the third cooling section (918), the outlet end of the third section furnace inner peripheral cooling blower (35) faces the outer peripheral sidewall (93), and the outlet end of the third section furnace outer peripheral cooling blower (36) faces the inner peripheral sidewall (92).

9. The annular furnace according to claim 1, characterized in that, The fourth cooling section cooling device (4) corresponds one-to-one with the material level (94) on the fourth cooling section (919) of the ring furnace (9). The fourth cooling section cooling device (4) includes the fourth section air supply main pipe (41), the fourth section top cooling air blower (42), the fourth section inner circumferential cooling air blower (43), and the fourth section outer circumferential cooling air blower (44). The inlet end of the fourth section top cooling air blower (42), the inlet end of the fourth section inner circumferential cooling air blower (43), and the inlet end of the fourth section outer circumferential cooling air blower (44) are all connected to the fourth section air supply main pipe (41). The fourth section top cooling air blower (42) is located on the protective cover (96) of the fourth cooling section (919). Above, the top cooling blower (42) of the fourth section can spray cooling gas onto the top wall (961) of the protective cover (96) on the fourth cooling section (919). The inner peripheral cooling blower (43) of the fourth section is located on the inner peripheral side of the fourth cooling section (919). The inner peripheral cooling blower (43) of the fourth section can spray cooling gas onto the peripheral wall (962) of the protective cover (96) on the inner side of the fourth cooling section (919). The outer peripheral cooling blower (44) of the fourth section is located on the outer peripheral side of the fourth cooling section (919). The outer peripheral cooling blower (44) of the fourth section can spray cooling gas onto the peripheral wall (962) of the protective cover (96) on the outer side of the fourth cooling section (919).

10. The annular furnace according to claim 9, characterized in that, The fourth section air supply main pipe (41) includes an upper section (411) and a lower section (412) connected in sequence. The upper section (411) and the lower section (412) are arranged vertically and vertically. The upper section (411) is equipped with a fourth section flow detection device (413) and a fourth section flow regulation device (414). The fourth section top cooling air blower (42), the fourth section inner peripheral cooling air blower (43), and the fourth section outer peripheral cooling air blower (44) are all connected to the lower section (412). The lower section (412) is located above the fourth section top cooling air blower (42), the fourth section inner peripheral cooling air blower (43), and the fourth section outer peripheral cooling air blower (44).

11. The annular furnace according to claim 9, characterized in that, Multiple fourth-section top cooling air blowers (42) are arranged at intervals along the diameter direction of the ring furnace (9). Along the direction from the inlet end of the fourth-section top cooling air blower (42) to the outlet end of the fourth-section top cooling air blower (42), the fourth-section top cooling air blower (42) contains an upper vertical section (421) and a lower horizontal section (422) connected in sequence. The upper vertical section (421) extends in the vertical direction, and the upper vertical section (421) is equipped with the fourth section first regulating valve (423). The lower horizontal section (422) extends in the circumference of the ring furnace (9), and the lower end of the upper vertical section (421) is connected to the lower horizontal section (422). Multiple downblown branch pipes (424) are connected below the lower horizontal section (422). The multiple downblown branch pipes (424) are arranged at intervals along the circumference of the ring furnace (9). The downblown branch pipes (424) are in an upright state, and the outlet end of the downblown branch pipes (424) faces downward. The inlet end of the fourth section inner peripheral cooling air blower (43) is connected to the inner end of the lower section of the main pipe (412), and the fourth section inner peripheral cooling air blower (43) is provided with the fourth section second regulating valve (431); the inlet end of the fourth section outer peripheral cooling air blower (44) is connected to the outer end of the lower section of the main pipe (412), and the fourth section outer peripheral cooling air blower (44) is provided with the fourth section third regulating valve (441).

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