Annular furnace and annealing cooling method of oriented silicon steel

Abstract

The invention discloses an annular furnace and an annealing and cooling method of oriented silicon steel, 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), and the annular furnace can more quickly and accurately control the cooling temperature and the cooling speed in the four cooling sections.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment equipment, in particular to a ring furnace, and also to an annealing cooling method for oriented silicon steel. Background Art

[0002] Grain-oriented silicon steel is a core material specially used for manufacturing transformers, and the high-temperature annealing ring furnace is an indispensable key equipment for producing grain-oriented silicon steel in the metallurgical industry. The ring furnace has a complex structure and high technical content, and is known as the jewel in the crown of metallurgical industrial furnaces. The ring furnace contains loading and unloading sections 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 Each section includes a plurality of material levels 94, and each material level 94 includes an inner material level and an outer material level arranged inside and outside.

[0003] In the ring furnace, the steel coil will undergo a series of complex heating and insulation processes, including primary heating, primary insulation, secondary heating, secondary insulation, primary cooling, secondary cooling, tertiary cooling and fourth cooling, and finally complete the high-temperature annealing process of oriented silicon steel.

[0004] During the high-temperature annealing and cooling process of the oriented silicon steel coil in the high-temperature annealing ring furnace, in order to prevent high-temperature oxidation, an inner cover must be used to cover the coil, and different protective gases are introduced at different temperature stages, so that the coil completes the heating, high-temperature annealing and cooling process under the protective atmosphere. The protective atmosphere uses N2, H2 or N2+H2 mixed gas.

[0005] In the above four cooling sections:

[0006] The steel coil is slowly cooled from the process annealing temperature to ~1080°C in the first cooling section 916. The cooling rate cannot be too fast and is usually controlled within 10-15°C / h. Otherwise, the cooling temperature difference between the hot spot and the cold spot of the steel coil is large, which increases the thermal stress and thus destroys the magnetic properties and plate shape of the steel strip.

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

[0008] The steel coil is forced to cool from 700°C to ~450°C in the third cooling section 918. Since it is in a low temperature stage, the cooling rate can be appropriately increased and is usually controlled below 30°C / h.

[0009] The steel coil is forcedly cooled and naturally cooled in the inner cover after it is taken out of the furnace in the fourth cooling section 919, so that the steel coil is cooled to below 300° C. when the cover is opened.

[0010] Rapidly and accurately controlling the cooling temperature and cooling rate in the above cooling section is the key to obtaining high-quality oriented silicon steel coils. Summary of the invention

[0011] In order to more quickly and accurately control the cooling temperature and cooling rate in the above-mentioned four cooling sections, the present invention provides a ring-shaped furnace and an annealing cooling method for oriented silicon steel. The ring-shaped furnace includes a first cooling section heat supplement 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.

[0012] The technical solution adopted by the embodiment of the present invention to solve the technical problem is:

[0013] A ring-shaped furnace comprises a furnace body, the furnace body comprises a fixed shell and a rotating furnace bottom, the furnace body also comprises a first cooling section, a second cooling section, a third cooling section and a fourth cooling section arranged in sequence, the ring-shaped furnace also comprises a first cooling section heat supplement 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 supplement 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 to the protective cover on the fourth cooling section.

[0014] The first cooling section heat supplement device comprises a burner and a fuel supply pipeline connected in sequence, the burner is located between two circumferentially adjacent material levels on the first cooling section, and the burner is located on the inner circumferential side wall and the outer circumferential side wall of the fixed shell, and the burner can spray flame into the first cooling section.

[0015] The second cooling section cooling device corresponds to the material level on the second cooling section of the annular furnace one by one. The second cooling section cooling device includes a second section air supply main pipe, a second section furnace top air supply main pipe, a second section furnace side air supply main pipe, a second section furnace top indirect radiation cooling pipe, a second section furnace inner peripheral side cooling blowing pipe, a second section furnace outer peripheral side cooling blowing pipe and a second section exhaust main pipe. The inlet end of the second section furnace top air supply main pipe and the inlet end of the second section furnace side air supply main pipe are both connected to the second section air supply main pipe. The inlet end of the second section furnace top indirect radiation cooling pipe is connected to the The second section furnace top air supply main is connected, the outlet end of the second section furnace top indirect radiation cooling pipe is connected to the second section exhaust main, a part of the second section furnace top indirect radiation cooling pipe is located at the upper part of the furnace chamber of the annular furnace, the inlet end of the second section furnace inner peripheral side cooling blowing pipe and the inlet end of the second section furnace outer peripheral side cooling blowing pipe are both connected to the second section furnace side air supply main, the outlet end of the second section furnace inner peripheral side cooling blowing pipe is connected to the inner peripheral side wall of the annular furnace, and the outlet end of the second section furnace outer peripheral side cooling blowing pipe is connected to the outer peripheral side wall of the annular furnace.

[0016] A second-section first regulating valve is arranged on the second-section furnace top air supply main pipe, and a plurality of second-section furnace top indirect radiation cooling pipes are arranged at intervals along the diameter direction of the annular furnace. From the inlet end of the second-section furnace top indirect radiation cooling pipe to the outlet end of the second-section furnace top indirect radiation cooling pipe, the second-section furnace top indirect radiation cooling pipe contains an air supply duct section, an in-furnace radiation cooling duct section and an exhaust duct section which are connected in sequence. The in-furnace radiation cooling duct section is located at the upper part of the furnace chamber of the annular furnace, and the in-furnace radiation cooling duct section extends along the circumference of the annular furnace. The in-furnace radiation cooling duct section is vertically opposite to the material level on the second cooling section of the annular furnace, and a second-section second regulating valve is arranged on the air supply duct section.

[0017] A portion of the cooling blowing pipe on the inner circumference side of the second-section furnace is located on the inner circumference side of the furnace body of the annular furnace, and a portion of the cooling blowing pipe on the outer circumference side of the second-section furnace is located on the outer circumference side of the furnace body of the annular furnace. A second-section third regulating valve is arranged on a portion of the cooling blowing pipe on the inner circumference side of the second-section furnace, and a second-section fourth regulating valve is arranged on a portion of the cooling blowing pipe on the outer circumference side of the second-section furnace; along the up and down directions, the outlet end of the cooling blowing pipe on the inner circumference side of the second-section furnace and the outlet end of the cooling blowing pipe on the outer circumference side of the second-section furnace are both located in the middle of the protective cover in the annular furnace; along the circumference of the annular furnace, the outlet end of the cooling blowing pipe on the inner circumference side of the second-section furnace and the outlet end of the cooling blowing pipe on the outer circumference side of the second-section furnace are both located between two adjacent material levels on the second cooling section, the outlet end of the cooling blowing pipe on the inner circumference side of the second-section furnace faces the outer circumference side wall, and the outlet end of the cooling blowing pipe on the outer circumference side of the second-section furnace faces the inner circumference side wall.

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

[0019] A third-section first regulating valve is provided on the third-section furnace top air supply main pipe, a plurality of third-section furnace top cooling blowing pipes are arranged at intervals along the diameter direction of the annular furnace, the third-section furnace top cooling blowing pipe is in an upright state, the outlet end of the third-section furnace top cooling blowing pipe faces downward, the third-section furnace top cooling blowing pipe is vertically aligned with the material level on the second cooling section of the annular furnace, and a third-section second regulating valve is provided on the third-section furnace top cooling blowing pipe.

[0020] A portion of the cooling blowing pipe on the inner circumference side of the third section furnace is located on the inner circumference side of the furnace body of the annular furnace, and a portion of the cooling blowing pipe on the outer circumference side of the third section furnace is located on the outer circumference side of the furnace body of the annular furnace, a portion of the cooling blowing pipe on the inner circumference side of the third section furnace is provided with a third section third regulating valve, and a portion of the cooling blowing pipe on the outer circumference side of the third section furnace is provided with a third section fourth regulating valve; along the up and down directions, the outlet end of the cooling blowing pipe on the inner circumference side of the third section furnace and the outlet end of the cooling blowing pipe on the outer circumference side of the third section furnace are both located in the middle of the protective cover in the annular furnace; along the circumference of the annular furnace, the outlet end of the cooling blowing pipe on the inner circumference side of the third section furnace and the outlet end of the cooling blowing pipe on the outer circumference side of the third section furnace are both located between two adjacent material levels on the third cooling section, the outlet end of the cooling blowing pipe on the inner circumference side of the third section furnace faces the outer circumference side wall, and the outlet end of the cooling blowing pipe on the outer circumference side of the third section furnace faces the inner circumference side wall.

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

[0022] The fourth section of the air supply main pipe includes an upper section of the main pipe and a lower section of the main pipe connected in sequence, the upper section of the main pipe and the lower section of the main pipe are arranged at an upper and lower interval, the upper section of the main pipe is provided with a fourth section flow detection device and a fourth section flow adjustment device, the fourth section top cooling blowing pipe, the fourth section inner circumference cooling blowing pipe and the fourth section outer circumference cooling blowing pipe are all connected to the lower section of the main pipe, and the lower section of the main pipe is located above the fourth section top cooling blowing pipe, the fourth section inner circumference cooling blowing pipe and the fourth section outer circumference cooling blowing pipe.

[0023] A plurality of fourth-section top cooling blowing pipes are arranged at intervals along the diameter direction of the annular furnace. From the inlet end of the fourth-section top cooling blowing pipe to the direction of the outlet end of the fourth-section top cooling blowing pipe, the fourth-section top cooling blowing pipe comprises an upper vertical section and a lower horizontal section connected in sequence; the upper vertical section extends in the up-down direction, and a fourth-section first regulating valve is arranged on the upper vertical section; the lower horizontal section extends along the circumference of the annular furnace, and the lower end of the upper vertical section is connected to the lower horizontal section; a plurality of lower blowing branch pipes are connected below the lower horizontal section, and the plurality of lower blowing branch pipes are arranged at intervals along the circumference of the annular furnace, and the lower blowing branch pipes are in an upright state, and the outlet end of the lower blowing branch pipe faces downward; the inlet end of the fourth-section inner circumference side cooling blowing pipe is connected to the inner end of the lower section of the main pipe, and a fourth-section second regulating valve is arranged on the fourth-section inner circumference side cooling blowing pipe; the inlet end of the fourth-section outer circumference side cooling blowing pipe is connected to the outer end of the lower section of the main pipe, and a fourth-section third regulating valve is arranged on the fourth-section outer circumference side cooling blowing pipe.

[0024] An annealing and cooling method for oriented silicon steel, the annealing and cooling method for oriented silicon steel adopts the above-mentioned annular furnace, and the annealing and cooling method for oriented silicon steel comprises the following steps:

[0025] The first cooling section heat supplement device provides heat to the first cooling section, the second cooling section cooling device reduces the heat in the second cooling section, the third cooling section cooling device reduces the heat in the third cooling section, and the fourth cooling section cooling device sprays cooling gas to the protective cover on the fourth cooling section.

[0026] The beneficial effect of the embodiment of the present invention is that the annular furnace includes a first cooling section heat supplement 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 speed in the four cooling sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification, which constitute a 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 improper limitations on the present invention.

[0028] Figure 1 This is a top view of the annular furnace.

[0029] Figure 2 It is an enlarged schematic diagram of the second cooling section and the third cooling section.

[0030] Figure 3 It is a schematic diagram of the first cooling section heat supplement device in an embodiment of the present invention.

[0031] Figure 4 It is a connection diagram of the second section air supply main pipe, the second section furnace top air supply main pipe and the second section furnace side air supply main pipe in an embodiment of the present invention.

[0032] Figure 5 It is a connection diagram of the second section of the exhaust main pipe in the embodiment of the present invention.

[0033] Figure 6 It is a schematic diagram of the second section of the furnace top indirect radiation cooling tube.

[0034] Figure 7 It is a connection diagram of the third section air supply main pipe, the third section furnace top air supply main pipe and the third section furnace side air supply main pipe in an embodiment of the present invention.

[0035] Figure 8 It is a schematic diagram of the connection of the third section of the exhaust duct in the embodiment of the present invention.

[0036] Fig. 9 It is a connection diagram of the fourth section of the air supply main pipe, the fourth section of the top cooling blowing pipe, the fourth section of the inner peripheral cooling blowing pipe and the fourth section of the outer peripheral cooling blowing pipe in an embodiment of the present invention.

[0037] Fig.10 Schematic diagram of the fourth section of the top cooling air blowing pipe in an embodiment of the present invention.

[0038] The following are the descriptions of the reference numerals:

[0039] 1. First cooling section heat supplement device; 2. Second cooling section cooling device; 3. Third cooling section cooling device; 4. Fourth cooling section cooling device; 9. Ring furnace;

[0040] 11. Burner; 12. Fuel supply pipeline;

[0041] 21. Second section air supply main; 22. Second section furnace top air supply main; 23. Second section furnace side air supply main; 24. Second section furnace top indirect radiation cooling pipe; 25. Second section furnace inner peripheral cooling air blowing pipe; 26. Second section furnace outer peripheral cooling air blowing pipe; 27. Second section exhaust main; 28. Second section furnace top exhaust pipe;

[0042] 211, second section first flow detection device; 212, second section first flow adjustment device;

[0043] 221, the first regulating valve of the second section;

[0044] 231, second section second flow detection device; 232, second section second flow adjustment device;

[0045] 241, air supply duct section; 242, furnace radiation cooling duct section; 243, exhaust duct section; 244, second regulating valve of the second section; 245, first expansion joint of the second section;

[0046] 251, the third regulating valve of the second section; 261, the fourth regulating valve of the second section;

[0047] 271, the second expansion joint of the second section; 281, the fifth regulating valve of the second section;

[0048] 31. The third section of air supply pipe; 32. The third section of furnace top air supply pipe; 33. The third section of furnace side air supply pipe; 34. The third section of furnace top cooling air blowing pipe; 35. The third section of furnace inner peripheral cooling air blowing pipe; 36. The third section of furnace outer peripheral cooling air blowing pipe; 37. The third section of exhaust pipe;

[0049] 311, the first flow detection device of the third section; 312, the first flow adjustment device of the third section;

[0050] 321, first regulating valve of the third section;

[0051] 331, the second flow detection device of the third section; 332, the second flow regulating device of the third section;

[0052] 341, the second regulating valve of the third section; 342, the first expansion joint of the third section;

[0053] 351, the third regulating valve of the third section; 361, the fourth regulating valve of the third section;

[0054] 371, the second expansion joint of the third section;

[0055] 41. The fourth section of air supply pipe; 42. The fourth section of top cooling air blowing pipe; 43. The fourth section of inner peripheral cooling air blowing pipe; 44. The fourth section of outer peripheral cooling air blowing pipe;

[0056] 411, upper section of main pipe; 412, lower section of main pipe; 413, fourth section flow detection device; 414, fourth section flow adjustment device;

[0057] 421, upper vertical section; 422, lower horizontal section; 423, first regulating valve of the fourth section; 424, lower blowing branch pipe;

[0058] 431, the second regulating valve of the fourth section; 441, the third regulating valve of the fourth section;

[0059] 91. furnace chamber; 92. inner side wall; 93. outer side wall; 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 soaking section; 914. heating section; 915. second soaking section; 916. first cooling section; 917. second cooling section; 918. third cooling section; 919. fourth cooling section;

[0060] 961. Top wall; 962. Peripheral wall. DETAILED DESCRIPTION

[0061] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0062] For the convenience of understanding and description, the following description of the present invention adopts an absolute positional relationship. Unless otherwise specified, the orientation word "upper" in it represents Figure 3 the upper side direction in Figure 3 the lower side direction in Figure 3 the left side direction in Figure 3 the right side direction in Figure 3 the direction perpendicular to Figure 3 the paper surface of

[0063] A ring furnace according to an embodiment of the present invention, the ring furnace includes a furnace body 95, the furnace body 95 includes a fixed housing 910 and a rotating furnace bottom 98, the furnace body 95 further includes a first cooling section 916, a second cooling section 917, a third cooling section 918 and a fourth cooling section 919 arranged in sequence, and the ring furnace 9 further includes a first cooling section heat supplementing 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 supplementing device 1 can supply 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.

[0064] As Figure 3 shown, the first cooling section heat supplementing device 1 includes a burner 11 and a fuel supply pipeline 12 connected in sequence. The burner 11 is located between two adjacent material levels 94 in the circumferential direction (along the furnace body 95) of the first cooling section 916, and the burner 11 is located on the inner peripheral side wall 92 and the outer peripheral side wall 93 of the fixed housing 910. The burner 11 can spray flames into the first cooling section 916.

[0065] The first stage (i.e., the first cooling section 916) is a high-temperature slow cooling stage, with a cooling rate of 10°C / h to 15°C / h. The oriented silicon steel coil is slowly cooled from the process annealing temperature to ~1080°C, using a natural cooling method in the furnace, and a protective atmosphere is passed through the inner cover of the steel coil. In this stage, the high-temperature steel coil transfers heat to the inner cover through radiation heat exchange, the inner cover transfers heat to the furnace lining through radiation heat exchange, and the furnace lining transfers heat to the surrounding environment through radiation and convection natural heat dissipation. In order to facilitate the control of the cooling rate and prevent the small-sized steel coil from cooling too quickly, a burner 11 for supplementary heat needs to be installed.

[0066] like Figures 4 to 6 As shown, the second cooling section cooling device 2 corresponds to the material level 94 on the second cooling section 917 of the annular furnace 9 one by one, and 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 side cooling blowing pipe 25, a second section furnace outer peripheral side cooling blowing pipe 26, and a second section exhaust 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, and the inlet end of the second section furnace top indirect radiation cooling pipe 24 is connected to the inlet end of the second section furnace top indirect radiation cooling pipe 24. The opening end is connected to the second-section furnace top air supply main pipe 22, the outlet end of the second-section furnace top indirect radiation cooling pipe 24 is connected to the second-section exhaust air main pipe 27, a part of the second-section furnace top indirect radiation cooling pipe 24 is located at the upper part of the furnace chamber 91 of the annular furnace 9, the inlet end of the second-section furnace inner peripheral side cooling blowing pipe 25 and the inlet end of the second-section furnace outer peripheral side cooling blowing pipe 26 are both connected to the second-section furnace side air supply main pipe 23, the outlet end of the second-section furnace inner peripheral side cooling blowing pipe 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 side cooling blowing pipe 26 is connected to the outer peripheral side wall 93 of the annular furnace 9.

[0067] The second stage (i.e., the second cooling section 917) is a high-temperature rapid cooling stage, with a cooling rate of 15-25°C / h. The oriented silicon steel coil is cooled from ~1080°C to ~700°C, and a forced cooling method of top radiant tube radiation heat exchange + cold air blowing convection heat exchange is adopted, and the inner cover of the steel coil is connected to a protective atmosphere. In this stage, the high-temperature steel coil transfers heat to the inner cover through radiation heat exchange, and the inner cover transfers heat to the top radiation tube, the furnace lining and the cold air blown in through radiation heat exchange and convection heat exchange. The radiation tube is cooled by cold air, the furnace lining dissipates heat by self-heating, and the hot air is discharged out of the furnace.

[0068] 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 side cooling blowing pipe 25, the second section furnace outer peripheral side cooling blowing pipe 26 and the second section exhaust main pipe 27 are all located outside the furnace body 95 of the annular furnace 9, and 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.

[0069] like Figures 4 to 6 As shown, the second section air supply main pipe 21 is provided with a second section first flow detection device 211 and a second section first flow regulating device 212, and the second section top air supply main pipe 22 is provided with a second section first regulating valve 221, and the regulating valve can be an existing manual regulating valve, electric regulating valve or pneumatic regulating valve. The second section furnace side air supply main pipe 23 is provided with a second section second flow detection device 231 and a second section second flow regulating device 232.

[0070] A plurality of second-section furnace top indirect radiation cooling pipes 24 are arranged at intervals along the diameter direction of the annular furnace 9. From the inlet end of the second-section furnace top indirect radiation cooling pipe 24 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 duct section 241, an in-furnace radiation cooling duct section 242 and an exhaust duct section 243 connected in sequence. The in-furnace radiation cooling duct section 242 is located in the furnace chamber 91 of the annular furnace 9. The in-furnace radiation cooling duct section 242 is located in the upper part of the furnace chamber 91 of the annular furnace 9.

[0071] The inlet end of the furnace radiation cooling duct section 242 is connected to the second section furnace top air supply main 22 through the air supply duct section 241, and the outlet end of the furnace radiation cooling duct section 242 is connected to the second section exhaust main 27 through the exhaust duct section 243. The furnace radiation cooling duct section 242 is located directly above the protective cover 96, and the furnace radiation cooling duct section 242 extends along the circumference of the annular furnace 9. The furnace radiation cooling duct section 242 is vertically opposite to the material level 94 on the second cooling section 917 of the annular furnace 9. The air supply duct section 241 is fixed to the steel structure 99 of the furnace top 97 by bolt connection, and the exhaust duct section 243 is placed on the steel structure 99 of the furnace top 97.

[0072] like Figures 4 to 6As shown, the air supply duct section 241 and the exhaust duct section 243 are both in an upright state, and both pass through the furnace roof 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 provided with a second-section second regulating valve 244 and a second-section first expansion joint 245, and the exhaust duct section 243 is provided with a second-section first expansion joint 245.

[0073] The second-section furnace inner peripheral side cooling blowing pipe 25 and the second-section furnace outer peripheral side cooling blowing pipe 26 are both located outside the furnace body 95, and are both bolted to the steel structure 99 of the furnace body 95. A portion of the second-section furnace inner peripheral side cooling blowing pipe 25 is located on the inner peripheral side of the furnace body 95 of the annular furnace 9, and a portion of the second-section furnace outer peripheral side cooling blowing pipe 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 furnace inner peripheral side cooling blowing pipe 25, and a second-section fourth regulating valve 261 is provided on a portion of the second-section furnace outer peripheral side cooling blowing pipe 26.

[0074] like Figures 4 to 6 As shown, along the up and down directions, the outlet end of the second-section furnace inner peripheral side cooling blow pipe 25 and the outlet end of the second-section furnace outer peripheral side cooling blow pipe 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 furnace inner peripheral side cooling blow pipe 25 and the outlet end of the second-section furnace outer peripheral side cooling blow pipe 26 are both located between two adjacent material levels 94 on the second cooling section 917, the outlet end of the second-section furnace inner peripheral side cooling blow pipe 25 faces the outer peripheral side wall 93, and the outlet end of the second-section furnace outer peripheral side cooling blow pipe 26 faces the inner peripheral side wall 92.

[0075] The second section of the exhaust main pipe 27 is provided with a second section of the second expansion joint 271, and the second section of the exhaust main pipe 27 extends along the diameter direction of the annular furnace 9. At the same time, in order to discharge the cooling air sprayed into the furnace by the side cooling air duct, the annular furnace cooling system also includes a second section of the furnace top exhaust pipe 28, which is located outside the furnace body 95, along the diameter direction of the annular furnace 9, and the second section of the furnace top exhaust pipe 28 is located at both ends of the furnace top 97 of the annular furnace 9. The gas in the furnace 91 can be discharged through the second section of the furnace top exhaust pipe 28, and the second section of the furnace top exhaust pipe 28 can discharge a small amount of hot air into the factory to maintain the pressure balance in the furnace. The second section of the furnace top exhaust pipe 28 is provided with a second section of the fifth regulating valve 281.

[0076] like Figures 7 and 8As shown, the third cooling section cooling device 3 corresponds to the material level 94 on the third cooling section 918 of the annular furnace 9 one by one, and 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 blowing pipe 34, a third section furnace inner peripheral side cooling blowing pipe 35, a third section furnace outer peripheral side cooling blowing pipe 36 and a third section exhaust pipe 37, and 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 connected to the third section air supply main pipe 31. 1, the inlet end of the third-stage furnace top cooling blowing pipe 34 is connected to the third-stage furnace top air supply pipe 32, the outlet end of the third-stage furnace top cooling blowing pipe 34 is connected to the furnace top 97, the inlet end of the third-stage furnace inner peripheral side cooling blowing pipe 35 and the inlet end of the third-stage furnace outer peripheral side cooling blowing pipe 36 are both connected to the third-stage furnace side air supply pipe 33, the outlet end of the third-stage furnace inner peripheral side cooling blowing pipe 35 is connected to the inner peripheral side wall 92 of the annular furnace 9, and the outlet end of the third-stage furnace outer peripheral side cooling blowing pipe 36 is connected to the outer peripheral side wall 93 of the annular furnace 9.

[0077] The third stage (i.e., the third cooling section 918) is a medium temperature fast cooling stage, with a cooling rate of 20-30°C / h. The oriented silicon steel coil is cooled from ~700°C to ~450°C, mainly using a forced cooling method of spray convection heat exchange, and a protective atmosphere is passed through the inner cover of the steel coil. In this stage, the high-temperature steel coil transfers heat to the inner cover through radiation heat exchange, and the inner cover transfers heat to the furnace lining and the blown cold air through radiation and convection heat exchange. The furnace lining dissipates heat by self-heating, and the hot air is discharged out of the furnace.

[0078] like Figures 7 and 8 As shown, the third section air supply main pipe 31 is provided 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 provided with a third section first regulating valve 321, the third section furnace side air supply main pipe 33 is provided with a third section second flow detection device 331 and a third section second flow regulation device 332, a plurality of third section furnace top cooling blowing pipes 34 are arranged at intervals along the diameter direction of the annular furnace 9, the third section furnace top cooling blowing pipes 34 are in an upright state, the outlet end of the third section furnace top cooling blowing pipe 34 faces downward, the third section furnace top cooling blowing pipe 34 is vertically opposite to the material level 94 on the second cooling section 917 of the annular furnace 9, and the third section furnace top cooling blowing pipe 34 is provided with a third section second regulating valve 341 and a third section first expansion joint 342.

[0079] A portion of the third-section furnace inner peripheral side cooling blow pipe 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 furnace outer peripheral side cooling blow pipe 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 furnace inner peripheral side cooling blow pipe 35, and a third-section fourth regulating valve 361 is provided on a portion of the third-section furnace outer peripheral side cooling blow pipe 36; a third-section second expansion joint 371 is provided on the third-section exhaust pipe 37.

[0080] Along the up and down directions, the outlet end of the third-section furnace inner side cooling blow pipe 35 and the outlet end of the third-section furnace outer side cooling blow pipe 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 side cooling blow pipe 35 and the outlet end of the third-section furnace outer side cooling blow pipe 36 are both located between two adjacent material levels 94 on the third cooling section 918, the outlet end of the third-section furnace inner side cooling blow pipe 35 faces the outer side wall 93, and the outlet end of the third-section furnace outer side cooling blow pipe 36 faces the inner side wall 92.

[0081] In order to make the temperature transition between the second cooling section 917 and the third cooling section 918 smoother, the first material level 94 of the third cooling section 918 is provided with the second cooling section cooling device 2 along the direction from the inlet end of the third cooling section 918 to the outlet end of the third cooling section 918, and the third cooling section cooling device 3 is provided from the second material level 94 to the last material level 94 of the third cooling section 918. For example, the 48# material level 94 is provided with the second cooling section cooling device 2, the 49# material level 94, the 50# material level 94, the 51# material level 94 and the 52# material level 94 are all provided with the third cooling section cooling device 3, and the 49# material level 94, the 50# material level 94, the 51# material level 94 and the 52# material level 94 are all in one-to-one correspondence with the third cooling section cooling device 3.

[0082] like Figures 9 and 10As shown, the fourth cooling section cooling device 4 corresponds to the material level 94 on the fourth cooling section 919 of the annular furnace 9 one by one, and the fourth cooling section cooling device 4 includes a fourth section air supply main pipe 41, a fourth section top cooling blowing pipe 42, a fourth section inner circumference cooling blowing pipe 43 and a fourth section outer circumference cooling blowing pipe 44, the inlet end of the fourth section top cooling blowing pipe 42, the inlet end of the fourth section inner circumference cooling blowing pipe 43 and the inlet end of the fourth section outer circumference cooling blowing pipe 44 are all connected to the fourth section air supply main pipe 41, and the fourth section top cooling blowing pipe 42 is located at the protective cover 96 of the fourth cooling section 919. Above the fourth cooling section 919, the top cooling blow pipe 42 of the fourth section can spray cooling gas toward the top wall 961 of the protective cover 96 on the fourth cooling section 919, the inner peripheral side cooling blow pipe 43 of the fourth section is located on the inner peripheral side of the fourth cooling section 919, and the inner peripheral side cooling blow pipe 43 of the fourth section can spray cooling gas toward the peripheral wall 962 of the inner side of the protective cover 96 of the fourth cooling section 919, and the outer peripheral side cooling blow pipe 44 of the fourth section is located on the outer peripheral side of the fourth cooling section 919, and the outer peripheral side cooling blow pipe 44 of the fourth section can spray cooling gas toward the peripheral wall 962 of the outer side of the protective cover 96 of the fourth cooling section 919.

[0083] like Figures 9 and 10 As shown, the fourth stage (i.e., the fourth cooling section 919) is a low-temperature cooling stage, in which the oriented silicon steel coil is cooled from 450°C to below 300°C, using a heat cooling method of convection heat exchange and natural heat dissipation. At this stage, the steel coil has been taken out of the furnace. When it is just taken out of the furnace, it is cooled by spraying cold air on the inner cover of the steel coil. Nitrogen protective gas is passed through the inner cover, and the heat is naturally dissipated after the protective gas is stopped and the cover is opened.

[0084] The fourth cooling section cooling device 4 corresponds to the material level 94 on the fourth cooling section 919 of the annular furnace 9 one by one, and 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 one by one. The fourth section air supply main pipe 41, the fourth section top cooling blowing pipe 42, the fourth section inner circumference cooling blowing pipe 43 and the fourth section outer circumference cooling blowing pipe 44 are all located outside the furnace body 95 of the annular furnace 9, and the fourth section air supply main pipe 41 extends along the diameter direction of the annular furnace 9.

[0085] The fourth section of the air supply main pipe 41 includes an upper main pipe section 411 and a lower main pipe section 412 which are connected in sequence. The upper main pipe section 411 and the lower main pipe section 412 are arranged at an interval up and down. Both the upper main pipe section 411 and the lower main pipe section 412 extend along the diameter direction of the annular furnace 9. One end of the upper main pipe section 411 is connected to the middle of the lower main pipe section 412 (along the diameter direction of the annular furnace 9).

[0086] A fourth-section flow detection device 413 and a fourth-section flow adjustment device 414 are provided on the upper section 411 of the main pipe. The fourth-section top cooling blowing pipe 42, the fourth-section inner circumferential cooling blowing pipe 43 and the fourth-section outer circumferential cooling blowing 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 blowing pipe 42, the fourth-section inner circumferential cooling blowing pipe 43 and the fourth-section outer circumferential cooling blowing pipe 44. Along the diameter direction of the annular furnace 9, the fourth-section top cooling blowing pipe 42 is located in the middle of the lower section 412 of the main pipe.

[0087] A plurality of fourth-section top cooling blowing pipes 42 are arranged at intervals along the diameter direction of the annular furnace 9. From the inlet end of the fourth-section top cooling blowing pipe 42 to the outlet end of the fourth-section top cooling blowing pipe 42, the fourth-section top cooling blowing pipe 42 includes an upper vertical section 421 and a lower horizontal section 422 which are connected in sequence.

[0088] like Fig.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 up-down direction, the upper vertical section 421 is provided with a fourth section first regulating valve 423, the lower horizontal section 422 extends along the circumference of 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 mechanical valve, electric valve, pneumatic valve or hydraulic valve.

[0089] A plurality of lower air blowing branch pipes 424 are connected to the lower horizontal section 422, and the plurality of lower air blowing branch pipes 424 are arranged at intervals along the circumferential extension of the annular furnace 9, and the lower air blowing branch pipes 424 are in an upright state, and the outlet ends of the lower air blowing branch pipes 424 face downward. The lower air blowing branch pipes 424 are connected to the steel structure 99 of the furnace top 97 by bolts, and are directly hung on the top of the inner cover if there is no steel structure.

[0090] The inlet end of the fourth section inner circumferential cooling blowing pipe 43 is connected to the inner end of the main pipe lower section 412, and a fourth section second regulating valve 431 is provided on the fourth section inner circumferential cooling blowing pipe 43. The outlet end of the fourth section inner circumferential cooling blowing pipe 43 faces the peripheral wall 962 of the protective cover 96 on the inner side of the fourth cooling section 919, and the fourth section inner circumferential cooling blowing pipe 43 is connected to the steel structure 99 on the side by bolts.

[0091] The inlet end of the fourth section outer peripheral cooling blowing pipe 44 is connected to the outer end of the main pipe lower section 412, and the fourth section third regulating valve 441 is provided on the fourth section outer peripheral cooling blowing pipe 44. The outlet end of the fourth section outer peripheral cooling blowing pipe 44 faces the peripheral wall 962 of the protective cover 96 outside the fourth cooling section 919, and the fourth section outer peripheral cooling blowing pipe 44 is connected to the steel structure 99 on the side by bolts.

[0092] The furnace body 95 includes a furnace 91, a fixed shell 910, a rotating furnace bottom 98 and a material level 94, and the fourth cooling section 919 is located outside the furnace 91. The fixed shell 910 includes an inner peripheral side wall 92, an outer peripheral side wall 93 and a furnace top 97. The annular furnace also includes an air supply main pipe and an exhaust main pipe, each air supply main pipe is connected to the air supply main pipe, and each exhaust main pipe is connected to the exhaust main pipe.

[0093] An annealing and cooling method for oriented silicon steel, the annealing and cooling method for oriented silicon steel adopts the above-mentioned annular furnace, and the annealing and cooling method for oriented silicon steel comprises the following steps:

[0094] The first cooling section heat supplement 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 to the protective cover 96 on the fourth cooling section 919.

[0095] In the first cooling section 916 of the annular furnace 9, the burner 11 sprays flame into the first cooling section 916 as needed, and a regulating valve is provided on the fuel supply pipeline 12 to adjust the amount of heat provided to the first cooling section 916 by the first cooling section heat supplement device 1.

[0096] In the second cooling section 917 of the annular furnace 9, a part of the cooling air in the second section air supply main pipe 21 enters the second section furnace top air supply main pipe 22, and another part of the cooling air in the second section air supply main pipe 21 enters the second section furnace side air supply main pipe 23. The cooling air in the second section furnace top air supply main pipe 22 enters the second section exhaust main pipe 27 through the second section furnace top indirect radiation cooling pipe 24. The second section furnace top indirect radiation cooling pipe 24 cools the upper part of the furnace 91 by indirect cooling. The second section furnace top indirect radiation cooling pipe 24 adopts centralized exhaust, which is collected into the exhaust main pipe and discharged outside the factory. The cooling air in the second section furnace side air supply main pipe 23 is blown into the furnace 91 through the second section furnace inner peripheral cooling blowing pipe 25 and the second section furnace outer peripheral cooling blowing pipe 26, and the furnace 91 is cooled by direct cooling. The gas in the furnace 91 can be discharged through the second section furnace top exhaust pipe 28, that is, the cooling air in the furnace is discharged outside the furnace and directly discharged into the factory.

[0097] In the third cooling section 918 of the annular furnace 9, a part of the cooling air in the third section air supply main pipe 31 enters the third section furnace top air supply main pipe 32, and another part of the cooling air in the third section air supply main pipe 31 enters the third section furnace side air supply main pipe 33. The cooling air in the third section furnace top air supply main pipe 32 enters the upper part of the cooling furnace 91 through the third section furnace top cooling blowing pipe 34, and cools the upper part of the furnace 91 by direct cooling. The cooling air in the third section furnace side air supply main pipe 33 is blown into the furnace 91 through the third section furnace inner peripheral cooling blowing pipe 35 and the third section furnace outer peripheral cooling blowing pipe 36, and cools the furnace 91 by direct cooling. The gas in the furnace 91 can be discharged through the second section exhaust main pipe 27, and the second section exhaust main pipe 27 is connected to the furnace body 95, and the second section exhaust main pipe 27 is connected to the furnace 91.

[0098] In the fourth cooling section 919 of the annular furnace 9, the cooling air in the fourth-section air supply main pipe 41 enters the fourth-section top cooling blowing pipe 42, the fourth-section inner side cooling blowing pipe 43 and the fourth-section outer side cooling blowing pipe 44. The fourth-section top cooling blowing pipe 42 blows cooling gas toward the top wall 961 of the protective cover 96 on the fourth cooling section 919, the fourth-section inner side cooling blowing pipe 43 blows cooling gas toward the peripheral wall 962 of the protective cover 96 on the inner side of the fourth cooling section 919, and the fourth-section outer side cooling blowing pipe 44 blows cooling gas toward the peripheral wall 962 of the protective cover 96 on the outer side of the fourth cooling section 919.

[0099] The annular furnace and the annealing cooling method of oriented silicon steel can help realize large-scale continuous production of high-temperature annealing of oriented silicon steel coils, and can enable the steel coils to automatically complete the cooling heat treatment process in the furnace, thereby meeting the strict process requirements for temperature control during the high-temperature annealing of oriented silicon steel.

[0100] The annular furnace and the annealing cooling method of oriented silicon steel have good adaptability and flexibility, and can meet the production requirements of oriented silicon steel coils of different specifications and types. By accurately controlling the temperature and cooling speed in the furnace, it can ensure that each batch of steel coils can meet consistent high quality standards. At the same time, due to the realization of high degree of automation, the work intensity of operators is greatly reduced, and the safety hazards in the production process are also reduced accordingly.

[0101] The annular furnace and the annealing cooling method for oriented silicon steel not only improve the production efficiency of high-temperature annealing of oriented silicon steel, but also can automatically and accurately control the cooling rate by adjusting the cooling air flow rate, so as to quickly cool the silicon steel coil after being taken out of the furnace, thereby significantly improving product quality and the safety of the production process.

[0102] The annular furnace cooling system and the annular furnace can help realize large-scale continuous production of high-temperature annealing of oriented silicon steel coils, and can enable the steel coils to automatically complete the cooling heat treatment process in the furnace, thereby meeting the strict process requirements for temperature control during the high-temperature annealing of oriented silicon steel.

[0103] The annular furnace cooling system and the annular furnace have good adaptability and flexibility, and can meet the production requirements of oriented silicon steel coils of different specifications and types. By accurately controlling the temperature and cooling speed in the furnace, it can ensure that each batch of steel coils can meet consistent high quality standards. At the same time, due to the high degree of automation, the workload of operators is greatly reduced, and the potential safety hazards in the production process are also reduced accordingly.

[0104] The annular furnace in-furnace cooling system and the annular furnace not only improve the production efficiency of high-temperature annealing of oriented silicon steel, but also can automatically and accurately control the cooling rate by adjusting the cooling air flow rate, so as to quickly cool the silicon steel coil after being taken out of the furnace, thereby significantly improving product quality and the safety of the production process.

[0105] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention should still fall within the scope of the present invention. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, with technical solutions and embodiments.

Claims

1. A ring furnace, the ring furnace (9) comprising a furnace body (95), the furnace body (95) comprising 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 in sequence, characterized in that: The annular furnace (9) further comprises a first cooling section heat supplement 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 supplement device (1) is capable of providing heat to the first cooling section (916); the second cooling section cooling device (2) is capable of reducing the heat in the second cooling section (917); the third cooling section cooling device (3) is capable of reducing the heat in the third cooling section (918); and the fourth cooling section cooling device (4) is capable of spraying 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 reheating device (1) comprises a burner (11) and a fuel supply pipeline (12) connected in sequence, the burner (11) being located between two circumferentially adjacent material levels (94) on the first cooling section (916), and the burner (11) being located on the inner circumferential side wall (92) and the outer circumferential side wall (93) of the fixed shell (910), and the burner (11) being capable of spraying flame 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 to the material level (94) on the second cooling section (917) of the annular furnace (9). The second cooling section cooling device (2) comprises 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 side cooling air blowing pipe (25), a second section furnace outer peripheral side cooling air blowing pipe (26) and a second section exhaust air 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 inlet end of the second section furnace top indirect radiation cooling pipe (24). The inlet end is connected to the second section furnace top air supply pipe (22), the outlet end of the second section furnace top indirect radiation cooling pipe (24) is connected to the second section exhaust pipe (27), a part of the second section furnace top indirect radiation cooling pipe (24) is located at the upper part of the furnace chamber (91) of the annular furnace (9), the inlet end of the second section furnace inner peripheral side cooling blowing pipe (25) and the inlet end of the second section furnace outer peripheral side cooling blowing 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 side cooling blowing pipe (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 side cooling blowing pipe (26) is connected to the outer peripheral side wall (93) of the annular furnace (9).

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

5. The annular furnace according to claim 3, characterized in that: A portion of the second-stage furnace inner peripheral side cooling blast pipe (25) is located on the inner peripheral side of a furnace body (95) of the annular furnace (9), and a portion of the second-stage furnace outer peripheral side cooling blast pipe (26) is located on the outer peripheral side of the furnace body (95) of the annular furnace (9). A second-stage third regulating valve (251) is provided on a portion of the second-stage furnace inner peripheral side cooling blast pipe (25), and a second-stage fourth regulating valve (261) is provided on a portion of the second-stage furnace outer peripheral side cooling blast pipe (26); Along the up-down direction, the outlet end of the cooling blast pipe (25) on the inner circumferential side of the second section furnace and the outlet end of the cooling blast pipe (26) on the outer circumferential side of the second section furnace 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 cooling blast pipe (25) on the inner circumferential side of the second section furnace and the outlet end of the cooling blast pipe (26) on the outer circumferential side of the second section furnace are both located between two adjacent material levels (94) on the second cooling section (917), the outlet end of the cooling blast pipe (25) on the inner circumferential side of the second section furnace faces the outer circumferential side wall (93), and the outlet end of the cooling blast pipe (26) on the outer circumferential side of the second section furnace faces the inner circumferential side wall (92).

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

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

8. The annular furnace according to claim 6, characterized in that A portion of the third-stage furnace inner peripheral side cooling blast pipe (35) is located on the inner peripheral side of a furnace body (95) of the annular furnace (9), and a portion of the third-stage furnace outer peripheral side cooling blast pipe (36) is located on the outer peripheral side of the furnace body (95) of the annular furnace (9). A third-stage third regulating valve (351) is provided on a portion of the third-stage furnace inner peripheral side cooling blast pipe (35), and a third-stage fourth regulating valve (361) is provided on a portion of the third-stage furnace outer peripheral side cooling blast pipe (36); In the up-down direction, the outlet end of the cooling blast pipe (35) on the inner circumferential side of the third section furnace and the outlet end of the cooling blast pipe (36) on the outer circumferential side of the third section furnace 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 cooling blast pipe (35) on the inner circumferential side of the third section furnace and the outlet end of the cooling blast pipe (36) on the outer circumferential side of the third section furnace are both located between two adjacent material levels (94) on the third cooling section (918), the outlet end of the cooling blast pipe (35) on the inner circumferential side of the third section furnace faces the outer circumferential side wall (93), and the outlet end of the cooling blast pipe (36) on the outer circumferential side of the third section furnace faces the inner circumferential side wall (92).

9. The annular furnace according to claim 1, characterized in that: The fourth cooling section cooling device (4) corresponds one-to-one to the material level (94) on the fourth cooling section (919) of the annular furnace (9). The fourth cooling section cooling device (4) comprises a fourth section air supply main pipe (41), a fourth section top cooling blowing pipe (42), a fourth section inner circumference cooling blowing pipe (43) and a fourth section outer circumference cooling blowing pipe (44). The inlet end of the fourth section top cooling blowing pipe (42), the inlet end of the fourth section inner circumference cooling blowing pipe (43) and the inlet end of the fourth section outer circumference cooling blowing pipe (44) are all connected to the fourth section air supply main pipe (41). The fourth section top cooling blowing pipe (42) is located at the protective cover (96) of the fourth cooling section (919). At the top, the fourth section top cooling blowing pipe (42) can spray cooling gas toward the top wall (961) of the protective cover (96) on the fourth cooling section (919), the fourth section inner side cooling blowing pipe (43) is located on the inner side of the fourth cooling section (919), and the fourth section inner side cooling blowing pipe (43) can spray cooling gas toward the peripheral wall (962) of the protective cover (96) on the inner side of the fourth cooling section (919), and the fourth section outer side cooling blowing pipe (44) is located on the outer side of the fourth cooling section (919), and the fourth section outer side cooling blowing pipe (44) can spray cooling gas toward 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) comprises an upper section (411) and a lower section (412) of the main pipe connected in sequence. The upper section (411) and the lower section (412) of the main pipe are arranged with an interval up and down. The upper section (411) of the main pipe is provided with a fourth section flow detection device (413) and a fourth section flow adjustment device (414). The fourth section top cooling blowing pipe (42), the fourth section inner circumference cooling blowing pipe (43) and the fourth section outer circumference cooling blowing pipe (44) are all connected to the lower section (412). The lower section (412) of the main pipe is located above the fourth section top cooling blowing pipe (42), the fourth section inner circumference cooling blowing pipe (43) and the fourth section outer circumference cooling blowing pipe (44).

11. The annular furnace according to claim 9, characterized in that A plurality of fourth-stage top cooling blowing pipes (42) are arranged at intervals along the diameter direction of the annular furnace (9); along the direction from the inlet end of the fourth-stage top cooling blowing pipe (42) to the outlet end of the fourth-stage top cooling blowing pipe (42), the fourth-stage top cooling blowing pipe (42) comprises an upper vertical section (421) and a lower horizontal section (422) connected in sequence; The upper vertical section (421) extends in the up-down direction, and a fourth-section first regulating valve (423) is arranged on the upper vertical section (421). The lower horizontal section (422) extends along the circumference of the annular furnace (9), and the lower end of the upper vertical section (421) is connected to the lower horizontal section (422); A plurality of lower air blowing branch pipes (424) are connected below the lower horizontal section (422). The plurality of lower air blowing branch pipes (424) are arranged at intervals along the circumferential extension of the annular furnace (9). The lower air blowing branch pipes (424) are in an upright state, and the outlet ends of the lower air blowing branch pipes (424) face downward. The inlet end of the fourth section inner circumferential side cooling blowing pipe (43) is connected to the inner end of the lower section (412) of the main pipe, and a fourth section second regulating valve (431) is provided on the fourth section inner circumferential side cooling blowing pipe (43); the inlet end of the fourth section outer circumferential side cooling blowing pipe (44) is connected to the outer end of the lower section (412) of the main pipe, and a fourth section third regulating valve (441) is provided on the fourth section outer circumferential side cooling blowing pipe (44).

12. An annealing cooling method for oriented silicon steel, characterized in that: The annealing and cooling method of the oriented silicon steel adopts the annular furnace according to claim 1, and the annealing and cooling method of the oriented silicon steel comprises the following steps: The first cooling section heat supplement 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 to the protective cover (96) on the fourth cooling section (919).

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