Cooling system outside annular furnace and annular furnace

Abstract

The utility model discloses a cooling system outside an annular furnace and the annular furnace, belongs to the technical field of heat treatment equipment, and aims to more quickly and accurately control the cooling temperature and the cooling speed in a fourth cooling section. The cooling system outside the annular furnace comprises an air supply main pipe (1), a top cooling blowpipe (2), an inner peripheral side cooling blowpipe (3) and an outer peripheral side cooling blowpipe (4), and the inlet end of the top cooling blowpipe (2), the inlet end of the inner peripheral side cooling blowpipe (3) and the inlet end of the outer peripheral side cooling blowpipe (4) are all connected with the air supply main pipe (1). When the external cooling system of the annular furnace is used in the fourth cooling section of the annular furnace, the cooling temperature and the cooling speed in the fourth cooling section can be more quickly and accurately controlled.

Description

Technical Field

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

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

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

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

[0005] Of the four cooling sections mentioned above:

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

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

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

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

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

[0011] To more quickly and accurately control the cooling temperature and cooling rate in the fourth cooling section, this invention provides an external cooling system for an annular furnace and an annular furnace. The external cooling system includes a top cooling air pipe, an inner circumferential cooling air pipe, and an outer circumferential cooling air pipe. When used in the fourth cooling section of the annular furnace, the external cooling system can more quickly and accurately control the cooling temperature and cooling rate in the fourth cooling section.

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

[0013] An external cooling system for an annular furnace includes a main air supply pipe, a top cooling air blower, an inner circumferential cooling air blower, and an outer circumferential cooling air blower. The inlet ends of the top, inner, and outer circumferential cooling air blowers are all connected to the main air supply pipe. The top cooling air blower is located above the protective cover of a fourth cooling section and can spray cooling gas onto the top wall of the protective cover on the fourth cooling section. The 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 protective cover on the inner side of the fourth cooling section. The 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 protective cover on the outer side of the fourth cooling section.

[0014] The external cooling system of the annular furnace corresponds one-to-one with the material level on the fourth cooling section of the annular furnace. The main air supply pipe, the top cooling air blower, the inner circumferential cooling air blower, and the outer circumferential cooling air blower are all located outside the furnace body of the annular furnace, and the main air supply pipe extends along the diameter of the annular furnace.

[0015] The main air supply pipe consists of an upper section and a lower section connected in sequence. The upper and lower sections are spaced apart and extend along the diameter of the annular furnace. One end of the upper section is connected to the middle of the lower section.

[0016] The upper section of the main pipe is equipped with a flow detection device and a flow regulation device. The top cooling air blower, the inner circumferential cooling air blower, and the outer circumferential cooling air blower 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 blower, the inner circumferential cooling air blower, and the outer circumferential cooling air blower.

[0017] Multiple top cooling air ducts are arranged at intervals along the diameter of the annular furnace. From the inlet end to the outlet end of the top cooling air duct, the top cooling air duct contains an upper vertical section and a lower horizontal section connected in sequence.

[0018] The upper vertical section extends in the vertical direction and is equipped with a first regulating valve. The lower horizontal section extends in the circumference of the annular furnace, and the lower end of the upper vertical section is connected to the lower horizontal section.

[0019] Multiple downward blowing branch pipes are connected to the lower horizontal section. These multiple downward blowing branch pipes extend and are arranged at intervals along the circumference of the annular furnace. The downward blowing branch pipes are in an upright state, with their outlet ends facing downwards.

[0020] The inlet end of the inner circumferential cooling air blower is connected to the inner end of the lower section of the main pipe, and a second regulating valve is installed on the inner circumferential cooling air blower.

[0021] The inlet end of the outer peripheral cooling air blower is connected to the outer end of the lower section of the main pipe, and a third regulating valve is installed on the outer peripheral cooling air blower.

[0022] An annular furnace includes a furnace body and the aforementioned annular furnace external cooling system. The furnace body contains a first cooling section, a second cooling section, a third cooling section, and a fourth cooling section arranged sequentially. The annular furnace external cooling system is capable of cooling a protective cover on the fourth cooling section.

[0023] The beneficial effects of this utility model embodiment are: the external cooling system of the annular furnace includes a top cooling air pipe, an inner circumferential cooling air pipe and an outer circumferential cooling air pipe. When the external cooling system of the annular furnace is used in the fourth cooling section of the annular furnace, the cooling temperature and cooling rate in the fourth cooling section can be controlled more quickly and accurately. Attached Figure Description

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

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

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

[0027] Figure 3 This is a schematic diagram showing the connection of the main air supply pipe, the top cooling air pipe, the inner circumferential cooling air pipe, and the outer circumferential cooling air pipe in the external cooling system of the annular furnace according to an embodiment of this utility model.

[0028] Figure 4This is a schematic diagram of the top cooling air blower pipe described in an embodiment of this utility model.

[0029] The following are the descriptions of the reference numerals:

[0030] 1. Main air supply pipe; 2. Top cooling air blower; 3. Inner circumferential cooling air blower; 4. Outer circumferential cooling air blower;

[0031] 11. Upper section of main pipe; 12. Lower section of main pipe; 13. Flow detection device; 14. Flow regulation device;

[0032] 21. Upper vertical section; 22. Lower horizontal section; 23. First regulating valve; 24. Lower blowing branch pipe;

[0033] 31. Second regulating valve;

[0034] 41. Third regulating valve;

[0035] 91. Furnace chamber; 92. Inner peripheral sidewall; 93. Outer peripheral sidewall; 94. Material level; 95. Furnace body; 96. Protective cover; 97. Furnace top; 98. Rotating furnace bottom; 99. Steel structure; 911. Loading and unloading section; 912. Preheating section; 913. First homogenization section; 914. Heating section; 915. Second homogenization section; 916. First cooling section; 917. Second cooling section; 918. Third cooling section; 919. Fourth cooling section;

[0036] 961. Top wall; 962. Peripheral wall. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] like Figures 3 to 4 As shown in the embodiment of this utility model, an external cooling system for an annular furnace includes a main air supply pipe 1, a top cooling air blower 2, an inner circumferential cooling air blower 3, and an outer circumferential cooling air blower 4. The inlet ends of the top cooling air blower 2, the inner circumferential cooling air blower 3, and the outer circumferential cooling air blower 4 are all connected to the main air supply pipe 1. The top cooling air blower 2 is located above the protective cover 96 of the fourth cooling section 919 of the annular furnace, and the top cooling air blower 2 can supply air to the fourth cooling section 919. Cooling gas is sprayed onto the top wall 961 of the protective cover 96 on the cooling section 919. The inner peripheral cooling air blower 3 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 outer peripheral cooling air blower 4 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.

[0040] The external cooling system of the annular furnace corresponds one-to-one with the material level 94 on the fourth cooling section 919 of the annular furnace 9. The external cooling system can cool the protective cover 96 on the material level 94 on the fourth cooling section 919 of the annular furnace 9. The main air supply pipe 1, the top cooling air blower 2, the inner peripheral cooling air blower 3, and the outer peripheral cooling air blower 4 are all located outside the furnace body 95 of the annular furnace 9. The main air supply pipe 1 extends along the diameter direction of the annular furnace 9.

[0041] The main air supply pipe 1 includes an upper section 11 and a lower section 12 connected in sequence. The upper section 11 and the lower section 12 are spaced apart vertically. Both the upper section 11 and the lower section 12 extend along the diameter direction of the annular furnace 9. One end of the upper section 11 is connected to the middle of the lower section 12 (along the diameter direction of the annular furnace 9).

[0042] The upper section 11 of the main pipe is equipped with a flow detection device 13 and a flow regulation device 14. The top cooling air pipe 2, the inner circumferential cooling air pipe 3 and the outer circumferential cooling air pipe 4 are all connected to the lower section 12 of the main pipe. The lower section 12 of the main pipe is located above the top cooling air pipe 2, the inner circumferential cooling air pipe 3 and the outer circumferential cooling air pipe 4. Along the diameter direction of the annular furnace 9, the top cooling air pipe 2 is located in the middle of the lower section 12 of the main pipe.

[0043] Multiple top cooling air pipes 2 are arranged at intervals along the diameter of the annular furnace 9. Along the direction from the inlet end of the top cooling air pipe 2 to the outlet end of the top cooling air pipe 2, the top cooling air pipe 2 contains an upper vertical section 21 and a lower horizontal section 22 connected in sequence.

[0044] like Figure 4As shown, the upper vertical section 21 and the lower horizontal section 22 are connected in an L-shape. The upper vertical section 21 extends in the vertical direction and is equipped with a first regulating valve 23. The lower horizontal section 22 extends circumferentially along the annular furnace 9, and the lower end of the upper vertical section 21 is connected to the lower horizontal section 22. The first regulating valve 23 can be an existing man-made valve, an electric valve, a pneumatic valve, or a hydraulic valve.

[0045] Multiple downward blowing branch pipes 24 are connected below the lower horizontal section 22. These branch pipes 24 extend circumferentially along the ring furnace 9 and are arranged at intervals. The branch pipes 24 are upright with their outlet ends facing downwards. The branch pipes 24 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 cover.

[0046] The inlet end of the inner peripheral cooling air blower 3 is connected to the inner end of the lower section 12 of the main pipe, and a second regulating valve 31 is provided on the inner peripheral cooling air blower 3. The outlet end of the inner peripheral cooling air blower 3 faces the peripheral wall 962 of the protective cover 96 inside the fourth cooling section 919, and the inner peripheral cooling air blower 3 is connected to the side steel structure 99 by bolts.

[0047] The inlet end of the outer peripheral cooling air blower 4 is connected to the outer end of the lower section 12 of the main pipe, and a third regulating valve 41 is provided on the outer peripheral cooling air blower 4. The outlet end of the outer peripheral cooling air blower 4 faces the peripheral wall 962 of the protective cover 96 outside the fourth cooling section 919, and the outer peripheral cooling air blower 4 is connected to the side steel structure 99 by bolts.

[0048] An annular furnace includes a furnace body 95 and the aforementioned annular furnace external cooling system. The furnace body 95 contains a first cooling section 916, a second cooling section 917, a third cooling section 918, and a fourth cooling section 919 arranged sequentially. The annular furnace external cooling system corresponds one-to-one with the material level 94 on the fourth cooling section 919 of the annular furnace. The annular furnace external cooling system is capable of cooling the protective cover 96 on the fourth cooling section 919.

[0049] like Figures 3 to 4 As shown, the furnace body 95 also includes a furnace chamber 91, an inner peripheral side wall 92, an outer peripheral side wall 93, a material level 94, a furnace top 97, and a rotating furnace bottom 98. The annular furnace also includes a main air supply pipe, with the main air supply pipe 1 connected to the main air supply pipe. The fourth cooling section 919 is located outside the furnace chamber 91.

[0050] The following describes the external cooling system of the annular furnace and the working process of the annular furnace.

[0051] In the fourth cooling section 919 of the annular furnace 9, the cooling air in the air supply pipe 1 enters the top cooling air blower 2, the inner peripheral cooling air blower 3, and the outer peripheral cooling air blower 4. The top cooling air blower 2 sprays cooling gas onto the top wall 961 of the protective cover 96 on the fourth cooling section 919, the inner peripheral cooling air blower 3 sprays cooling gas onto the peripheral wall 962 of the protective cover 96 on the inner side of the fourth cooling section 919, and the outer peripheral cooling air blower 4 sprays cooling gas onto the peripheral wall 962 of the protective cover 96 on the outer side of the fourth cooling section 919.

[0052] The external cooling system of the ring furnace and the ring furnace can help realize the large-scale continuous production of high-temperature annealing of 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 oriented silicon steel.

[0053] The external cooling system of the annular furnace and the annular furnace itself possess excellent adaptability and flexibility, capable of meeting the production needs of oriented silicon steel coils of different specifications and types. By precisely controlling the furnace temperature and cooling rate, it ensures 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.

[0054] The external cooling system of the annular furnace and the annular furnace 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.

[0055] 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. An external cooling system for an annular furnace, characterized in that, The external cooling system of the annular furnace includes a main air supply pipe (1), a top cooling air blower (2), an inner peripheral cooling air blower (3), and an outer peripheral cooling air blower (4). The inlet ends of the top cooling air blower (2), the inner peripheral cooling air blower (3), and the outer peripheral cooling air blower (4) are all connected to the main air supply pipe (1). The top cooling air blower (2) is located above the protective cover (96) of the fourth cooling section (919). The top cooling air blower (2) can provide air to the protective cover (96) of the fourth cooling section (919). Cooling gas is sprayed onto the top wall (961) of the cover (96). The inner peripheral cooling blower (3) is located on the inner peripheral side of the fourth cooling section (919). The inner peripheral cooling blower (3) can spray cooling gas onto the peripheral wall (962) of the protective cover (96) inside the fourth cooling section (919). The outer peripheral cooling blower (4) is located on the outer peripheral side of the fourth cooling section (919). The outer peripheral cooling blower (4) can spray cooling gas onto the peripheral wall (962) of the protective cover (96) outside the fourth cooling section (919).

2. The external cooling system for the annular furnace according to claim 1, characterized in that, The external cooling system of the annular furnace corresponds one-to-one with the material level (94) on the fourth cooling section (919) of the annular furnace (9). The main air supply pipe (1), the top cooling air blower (2), the inner peripheral cooling air blower (3) and the outer peripheral cooling air blower (4) are all located outside the furnace body (95) of the annular furnace (9). The main air supply pipe (1) extends along the diameter direction of the annular furnace (9).

3. The external cooling system for the annular furnace according to claim 1, characterized in that, The main air supply pipe (1) includes an upper section (11) and a lower section (12) connected in sequence. The upper section (11) and the lower section (12) are arranged at intervals. Both the upper section (11) and the lower section (12) extend along the diameter of the annular furnace (9). One end of the upper section (11) is connected to the middle of the lower section (12).

4. The external cooling system for the annular furnace according to claim 3, characterized in that, The upper section (11) of the main pipe is equipped with a flow detection device (13) and a flow regulation device (14). The top cooling air blower (2), the inner peripheral cooling air blower (3) and the outer peripheral cooling air blower (4) are all connected to the lower section (12) of the main pipe. The lower section (12) of the main pipe is located above the top cooling air blower (2), the inner peripheral cooling air blower (3) and the outer peripheral cooling air blower (4).

5. The external cooling system for the annular furnace according to claim 1, characterized in that, Multiple top cooling air pipes (2) are arranged at intervals along the diameter of the ring furnace (9). Along the direction from the inlet end of the top cooling air pipe (2) to the outlet end of the top cooling air pipe (2), the top cooling air pipe (2) contains an upper vertical section (21) and a lower horizontal section (22) connected in sequence.

6. The external cooling system for the annular furnace according to claim 5, characterized in that, The upper vertical section (21) extends in the vertical direction and is equipped with a first regulating valve (23). The lower horizontal section (22) extends in the circumference of the ring furnace (9) and the lower end of the upper vertical section (21) is connected to the lower horizontal section (22).

7. The external cooling system for the annular furnace according to claim 5, characterized in that, Multiple downblown branch pipes (24) are connected below the lower horizontal section (22). The multiple downblown branch pipes (24) are arranged at intervals along the circumference of the ring furnace (9). The downblown branch pipes (24) are in an upright state, and the outlet end of the downblown branch pipes (24) faces downward.

8. The external cooling system for the annular furnace according to claim 4, characterized in that, The inlet end of the inner peripheral cooling blower (3) is connected to the inner end of the lower section (12) of the main pipe, and a second regulating valve (31) is provided on the inner peripheral cooling blower (3).

9. The external cooling system for the annular furnace according to claim 4, characterized in that, The inlet end of the outer peripheral cooling blower (4) is connected to the outer end of the lower section (12) of the main pipe, and a third regulating valve (41) is provided on the outer peripheral cooling blower (4).

10. A ring furnace, characterized in that, The annular furnace includes a furnace body (95) and an external cooling system for the annular furnace as described in claim 1. The furnace body (95) contains a first cooling section (916), a second cooling section (917), a third cooling section (918), and a fourth cooling section (919) arranged sequentially. The external cooling system for the annular furnace is capable of cooling the protective cover (96) on the fourth cooling section (919).

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