Wrapping-free tundish collector nozzle heat preservation structure and application method thereof

Abstract

The invention discloses a package-free tundish collector nozzle heat preservation structure and an application method thereof.The package-free tundish collector nozzle heat preservation structure comprises a tundish, a first streamer cavity, a second streamer cavity and a third streamer cavity are formed in the tundish, and the first streamer cavity, the second streamer cavity and the third streamer cavity are communicated; the first streamer cavity, the second streamer cavity and the third streamer cavity are separated through isolation structures, the bottoms of the second streamer cavity and the third streamer cavity on the two sides of the tundish are fixedly provided with submersed water outlets, the submersed water outlets are connected with a heat preservation structure, and plugging bodies are arranged in the submersed water outlets. The plugging body penetrates through the submersed drain hole and extends downwards to the position of the heat preservation structure, and a plasma gun is arranged above the second streamer cavity and the third streamer cavity.

Description

Technical Field

[0001] This invention belongs to the technical field of metallurgical continuous casting equipment, specifically relating to a non-wrapped tundish outlet insulation structure and its application method. Background Technology

[0002] In continuous casting production, it is necessary to ensure the insulation of the tundish. Currently, the most common method is asbestos felt wrapping, which has the following drawbacks: Significant material waste: Each baking requires a large amount of asbestos felt, with a wrapping thickness of 3-5 cm, and it cannot be recycled after use. Health and safety hazards: Operators are prone to inhaling asbestos dust (the International Agency for Research on Cancer (IARC) classifies asbestos as a Group 1 carcinogen) during manual wrapping, and long-term exposure can easily induce pneumoconiosis. High labor costs: Each wrapping takes approximately 8-10 minutes per tundish nozzle and requires skilled workers, affecting production line preparation efficiency. Poor insulation stability: The tightness of the wrapping depends on the worker's experience, easily leading to uneven baking temperatures.

[0003] In view of the above factors, a non-wrapping insulation structure for the intermediate tundish drain outlet and its application method are provided to achieve integral insulation from the intermediate tundish to the drain outlet. This structure is reusable, eliminates asbestos contact, and improves operational efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a non-wrapped intermediate-insulation structure for the drain outlet and its application method, so as to solve the problems mentioned in the background art.

[0005] The objective of this invention is achieved through the following technical solution: a non-wrapped intermediate package drain inlet insulation structure, comprising an intermediate package, wherein three flow chambers are formed within the intermediate package: a first flow chamber, a second flow chamber, and a third flow chamber. The first flow chamber, the second flow chamber, and the third flow chamber are interconnected and separated by an isolation structure. Immersion drain inlets are fixedly provided at the bottom of the second flow chamber and the third flow chamber on both sides of the intermediate package, and the immersion drain inlets are connected to the insulation structure.

[0006] A sealing body is provided inside the immersion drain, and the sealing body extends downward through the immersion drain to the position of the heat preservation structure;

[0007] Plasma guns are mounted above the second and third flow chambers.

[0008] Furthermore, the isolation structure includes a first barrier wall fixed to the upper end face of the tundish and a second barrier wall fixed to the lower end face of the tundish, the first barrier wall and the second barrier wall are spaced apart, and the first barrier wall does not contact the tundish;

[0009] A flow channel is formed between the first retaining wall and the second retaining wall, and the upper and lower ends of the first retaining wall and the second retaining wall are flush, or the upper end of the second retaining wall is higher than the lower end of the first retaining wall.

[0010] Furthermore, the insulation structure is a barrel structure, including an outer steel shell layer, which forms the support and casting cavity shape, and a 50±2mm thick high-alumina castable is formed inside the outer steel shell layer.

[0011] The insulation structure is provided with an air duct, which is connected to the insulation structure. The bottom of the insulation structure is a blind plate structure, and a flow channel is opened on the blind plate structure.

[0012] Furthermore, the exhaust pipe is a φ20mm heat-resistant stainless steel pipe, embedded in the barrel wall at a 45° angle. It is connected to an external air duct to draw the baking flame away from the blind plate area of ​​the drain outlet. A φ50mm × 45° angled stainless steel pipe is welded to the side wall of the barrel structure.

[0013] Furthermore, the diameter of the immersion drain is larger than the diameter of the sealing body, the sealing body is a cylindrical structure, a plug hole is fixedly opened on the intermediate package, the sealing body is movably connected to the inner wall of the plug hole, and the sealing body extends downward to cooperate with the flow channel;

[0014] The diameter of the flow channel is smaller than the diameter of the end of the sealing body.

[0015] Furthermore, the diameter of the channel formed by the insulation structure is larger than the diameter of the sealing body.

[0016] Furthermore, the bottom surface of the first flow chamber is higher than the height of the second and third flow chambers;

[0017] The transition area between the first flow chamber and the second and third flow chambers is inclined.

[0018] Furthermore, the first flow cavity is fixedly provided with an impact zone, which adopts a concave groove structure formed by mullite castable.

[0019] Furthermore, the intermediate liner includes an outer wall layer, and the inner side of the outer wall layer is provided with two layers of materials, including a nanoplate heat insulation layer and a lightweight brick layer. The inner side of the lightweight brick layer is formed by semi-lightweight mullite castable or high-alumina castable.

[0020] The lightweight brick layer is 30mm thick, and the nano-board thermal insulation layer is 5-10mm thick.

[0021] An application method for a wrap-free intermediate-insulation structure for drain outlets includes the following steps;

[0022] The ladle nozzle is connected to the tundish inlet, and the ladle nozzle extends into the inlet. The first, second, and third flow chambers of the tundish are interconnected. Molten steel flows from the first flow chamber to the second and third flow chambers through the isolation structure and enters the insulation structure of the outlet.

[0023] A sealing body is installed inside the submersible drain outlet. The sealing body extends downward through the submersible drain outlet to the insulation structure. The diameter of the submersible drain outlet is larger than the diameter of the sealing body. The sealing body is a cylindrical structure. A plug hole is fixedly opened on the middle package. The sealing body is movably connected to the inner wall of the plug hole. The sealing body extends downward to cooperate with the flow channel.

[0024] A plasma gun is installed above the second and third flow chambers to heat the liquid surface of the second and third flow chambers.

[0025] A φ20mm heat-resistant stainless steel pipe is welded to the insulation structure and runs through it, embedded in the cylinder wall at a 45° angle. It is also connected to an external air duct to divert the baking flame away from the blind plate area of ​​the drain outlet. The insulation structure is formed using a mixed high-alumina castable. The high-alumina castable has the following proportions: 70% aggregate, 25% fine powder, and 5% binder. It is injected into the inner cavity of the steel shell of the insulation structure and compacted by vibration. After standing for 24 hours, it is demolded and baked at 300℃ for 24 hours to form a stable insulation layer.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The outer steel shell of this invention is made of Q235B heat-resistant steel plate, which provides structural support and the shape of the refractory mortar casting cavity. The height of the barrel is 1250mm. The insulation structure uses refractory mortar insulation layer material. After precasting and casting with high alumina castable (Al2O3≥75%), it is baked and cured at 300℃×24h. A φ20mm heat-resistant stainless steel pipe is fixedly welded to the insulation structure and embedded into the barrel wall at a 45° angle. It is connected to an external air duct to lead the baking flame away from the blind plate area of ​​the drain outlet.

[0028] This invention uses a plasma gun in conjunction with an insulation structure to insulate the tundish and the outlet. The plasma gun ionizes the gas (N2, Ar, or a mixture thereof) through electrode discharge, generating a high-energy electric arc. The core temperature can reach up to 10,000 K. Through the convection generated by the combination of electron radiation and the movement of ionized gas, heat is transferred to the molten steel in the tundish to increase the temperature of the molten steel in the tundish.

[0029] This invention provides a special insulation barrel structure that replaces the traditional asbestos wrapping process, achieving integrated insulation from the intermediate bag to the drain outlet. It is reusable, eliminates asbestos contact, and improves work efficiency. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the connection between the intermediate tundish and the insulation device of the present invention;

[0031] Figure 2 This is a schematic diagram of the cross-section of the intermediate tundish of the present invention;

[0032] Figure 3 This is a schematic diagram of the combination of the sealing body and the thermal insulation structure of the present invention;

[0033] Figure 4 This is a schematic diagram of the cross-section of the thermal insulation structure of the present invention;

[0034] Figure 5 This is the present invention. Figure 2 A magnified view of a portion of the image;

[0035] Figure 6 This is a partially enlarged schematic diagram of the impact zone of the present invention. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] like Figure 1-6As shown, a non-wrapped intermediate package drain outlet insulation structure includes an intermediate package 1, which contains three flow chambers: a first flow chamber 2, a second flow chamber 3, and a third flow chamber 4. The first flow chambers 2, 3, and 4 are interconnected and separated by an isolation structure 5. Immersion drain outlets 6 are fixedly provided at the bottom of the second flow chambers 3 and 4 on both sides of the intermediate package 1 and are connected to the insulation structure 7.

[0040] A sealing body 8 is provided inside the immersion drain 6, and the sealing body 8 extends downward through the immersion drain 6 to the position of the heat insulation structure 7.

[0041] Plasma guns 9 are installed above the second and third flow chambers 3 and 4. The plasma guns ionize the gas (N2, Ar, or a mixture thereof) through electrode discharge, generating a high-energy electric arc. The core temperature can reach up to 10,000 K. Through the convection generated by the combination of electron radiation and the movement of ionized gas, heat is transferred to the molten steel in the tundish to increase the temperature of the molten steel in the tundish.

[0042] In order to facilitate the use of the molten steel, the isolation structure 5 includes a first baffle 10 fixed to the upper end face of the tundish 1 and a second baffle 11 fixed to the lower end face of the tundish 1. The first baffle 10 and the second baffle 11 are spaced apart, and the first baffle 10 does not contact the tundish 1.

[0043] A flow channel is formed between the first barrier wall 10 and the second barrier wall 11, and the upper and lower ends of the first barrier wall 10 and the second barrier wall 11 are flush, or the upper end of the second barrier wall 11 is higher than the bottom end of the first barrier wall 10.

[0044] In order to facilitate reusability, eliminate asbestos contact, and improve work efficiency during use, the insulation structure 7 is a barrel structure, including an outer steel shell layer 12. The outer steel shell layer 12 forms the support and casting cavity shape, and a 50±2mm thick high-alumina castable is formed inside the outer steel shell layer 12.

[0045] The insulation structure 7 is provided with an air duct 13, which is connected to the insulation structure 7. The bottom of the insulation structure 7 is a blind plate structure, and a flow channel 14 is provided on the blind plate structure.

[0046] To facilitate baking during use, a stainless steel pipe is embedded in the barrel wall at a 45° angle and connected to an external air duct to draw the baking flame away from the blind plate area of ​​the drain outlet. The exhaust pipe creates a negative pressure zone of 0.5-1.0 kPa inside the barrel. The exhaust pipe 13 is a φ20mm heat-resistant stainless steel pipe embedded in the barrel wall at a 45° angle and connected to an external air duct to draw the baking flame away from the blind plate area of ​​the drain outlet. A φ50mm × 45° angled stainless steel pipe is welded to the side wall of the barrel structure.

[0047] In order to facilitate the blocking and sealing of the flow channel by the sealing body 8 during use, the diameter of the immersion drain 6 is larger than the diameter of the sealing body 8. The sealing body 8 is a cylindrical structure. A plug hole 15 is fixedly opened on the intermediate package 1. The sealing body 8 is movably connected to the inner wall of the plug hole 15. The sealing body 8 extends downward to cooperate with the flow channel 14.

[0048] The diameter of the flow channel 14 is smaller than the diameter of the end of the sealing body 8.

[0049] The diameter of the channel formed by the thermal insulation structure 7 is larger than the diameter of the sealing body 8.

[0050] To facilitate backflow from the first flow chamber 2 to the second flow chamber 3 and the third flow chamber 4 during use, the bottom surface of the first flow chamber 2 is higher than the height of the second flow chamber 3 and the third flow chamber 4.

[0051] The transition area between the first flow chamber 2 and the second flow chamber 3 and the third flow chamber 4 is inclined.

[0052] To reduce the impact of molten steel on the tundish during use, the first pouring cavity 2 is fixedly provided with an impact zone 16. The impact zone 16 is a concave groove structure formed by mullite castable. By setting the impact zone, the weak point of the tundish impact zone is solved, providing a reliable guarantee for increasing the number of tundish casting heats and eliminating the safety risk of steel leakage in the tundish impact zone. The impact zone 16 is formed by lightweight mullite castable or high-alumina castable. At the bottom of the impact zone 16, a wave-shaped structure or an intermittent convex circular structure is set to reduce the turbulent flow of molten steel during use.

[0053] To facilitate increased insulation and durability of the tundish during use, the tundish 1 includes an outer wall layer 17. The inner side of the outer wall layer 17 is provided with two layers of materials, including a nano-plate heat insulation layer 18 and a lightweight brick layer 19. The inner side of the lightweight brick layer 19 is formed by semi-lightweight mullite castable or high-alumina castable.

[0054] The lightweight brick layer is 30mm thick, and the nano-board thermal insulation layer is 5-10mm thick.

[0055] An application method of a wrap-around inlet water outlet insulation structure specifically includes the following steps;

[0056] The ladle nozzle is connected to the upper nozzle of the tundish 1, and the ladle nozzle extends into the upper nozzle. The first flow chamber 2, the second flow chamber 3, and the third flow chamber 4 of the tundish are connected. The molten steel flows from the first flow chamber 2 to the second flow chamber 3 and the third flow chamber 4 through the isolation structure 5 and enters the insulation structure 7 of the lower nozzle.

[0057] A sealing body 8 is provided inside the submersible drain outlet 6. The sealing body 8 extends downward through the submersible drain outlet 6 to the position of the heat insulation structure 7. The diameter of the submersible drain outlet 6 is larger than the diameter of the sealing body 8. The sealing body 8 is a cylindrical structure. A plug hole 15 is fixedly opened on the intermediate package 1. The sealing body 8 is movably connected to the inner wall of the plug hole 15. The sealing body 8 extends downward to cooperate with the flow channel 14.

[0058] A plasma gun 9 is installed above the second flow chamber 3 and the third flow chamber 4 to heat the liquid surface of the second flow chamber 3 and the third flow chamber 4.

[0059] A φ20mm heat-resistant stainless steel pipe is welded to the insulation structure 7 and runs through it. It is embedded into the cylinder wall at a 45° angle and connected to an external air duct to guide the baking flame away from the blind plate area of ​​the drain outlet. The insulation structure 7 is formed by mixing high-alumina castable. The high-alumina castable ratio is: 70% aggregate, 25% fine powder, and 5% binder. It is injected into the inner cavity of the steel shell of the insulation structure 7 and vibrated to make it dense. After standing for 24 hours, it is demolded and baked at 300℃ for 24 hours to form a stable insulation layer.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A non-wrapped, insulated drain outlet structure, characterized in that: The intermediate package includes an intermediate package (1), which contains three flow chambers: a first flow chamber (2), a second flow chamber (3), and a third flow chamber (4). The first flow chamber (2), the second flow chamber (3), and the third flow chamber (4) are connected to each other. The first flow chamber (2), the second flow chamber (3), and the third flow chamber (4) are separated by an isolation structure (5). The bottom of the second flow chamber (3) and the third flow chamber (4) on both sides of the intermediate package (1) is fixedly provided with an immersion drain (6), which is connected to an insulation structure (7). A sealing body (8) is provided inside the immersion drain (6), and the sealing body (8) extends downward through the immersion drain (6) to the position of the heat insulation structure (7); A plasma gun (9) is provided above the second flow chamber (3) and the third flow chamber (4).

2. The insulation structure for the drain outlet without wrapping as described in claim 1, characterized in that: The isolation structure (5) includes a first baffle (10) fixed to the upper end face of the intermediate package (1) and a second baffle (11) fixed to the lower end face of the intermediate package (1). The first baffle (10) and the second baffle (11) are spaced apart, and the first baffle (10) does not contact the intermediate package (1). A flow channel is formed between the first barrier wall (10) and the second barrier wall (11), and the upper and lower ends of the first barrier wall (10) and the second barrier wall (11) are flush or the upper end of the second barrier wall (11) is higher than the bottom end of the first barrier wall (10).

3. The insulation structure for the drain outlet without wrapping as described in claim 2, characterized in that: The insulation structure (7) is a barrel structure, including an outer steel shell layer (12). The outer steel shell layer (12) forms the support and casting cavity shape, and a 50±2mm thick high-alumina castable is formed inside the outer steel shell layer (12). The insulation structure (7) is provided with an air duct (13), which is connected to the insulation structure (7). The bottom of the insulation structure (7) is a blind plate structure, and a flow channel (14) is provided on the blind plate structure.

4. The insulation structure for the drain outlet without wrapping as described in claim 3, characterized in that: The exhaust pipe (13) is a φ20mm heat-resistant stainless steel pipe, which is embedded in the barrel wall at a 45° angle. It is connected to an external air pipe to draw the baking flame away from the blind plate area of ​​the drain outlet. The side wall of the barrel structure is opened and welded with a φ50mm×45° angled stainless steel pipe.

5. The insulation structure for the drain outlet without wrapping as described in claim 4, characterized in that: The diameter of the immersion drain (6) is larger than the diameter of the sealing body (8). The sealing body (8) is a cylindrical structure. A plug hole (15) is fixedly opened on the intermediate package (1). The sealing body (8) is movably connected to the inner wall of the plug hole (15). The sealing body (8) extends downward to cooperate with the flow channel (14). The diameter of the flow channel (14) is smaller than the diameter of the end of the sealing body (8).

6. The insulation structure for the drain outlet without wrapping as described in claim 5, characterized in that: The diameter of the channel formed by the insulation structure (7) is larger than the diameter of the sealing body (8).

7. The insulation structure for the drain outlet without wrapping as described in claim 6, characterized in that: The bottom surface of the first flow chamber (2) is higher than the height of the second flow chamber (3) and the third flow chamber (4); The transition area between the first flow chamber (2) and the second flow chamber (3) and the third flow chamber (4) is inclined.

8. The insulation structure for the drain outlet without wrapping as described in claim 7, characterized in that: The first flow chamber (2) is fixedly provided with an impact zone (16), which is a groove structure formed by mullite castable.

9. The insulation structure for the drain outlet without wrapping as described in claim 7, characterized in that: The intermediate package (1) includes an outer wall layer (17), and the inner side of the outer wall layer (17) is provided with two layers of materials including a nanoplate heat insulation layer (18) and a lightweight brick layer (19). The inner side of the lightweight brick layer (19) is formed by semi-lightweight mullite castable or high-alumina castable. The lightweight brick layer is 30mm thick, and the nano-board thermal insulation layer is 5-10mm thick.

10. A method for applying the wrap-free intermediate-type drain outlet insulation structure according to any one of claims 1-9, characterized in that: Specifically, the steps are as follows; The ladle nozzle is connected to the upper nozzle of the tundish (1), and the ladle nozzle extends into the upper nozzle. The first flow chamber (2), the second flow chamber (3), and the third flow chamber (4) of the tundish are connected. The molten steel flows from the first flow chamber (2) to the second flow chamber (3) and the third flow chamber (4) through the isolation structure (5) and enters the insulation structure (7) of the lower nozzle. A sealing body (8) is provided inside the submersible drain (6). The sealing body (8) extends downward through the submersible drain (6) to the position of the heat insulation structure (7). The diameter of the submersible drain (6) is larger than the diameter of the sealing body (8). The sealing body (8) is a cylindrical structure. A plug hole (15) is fixedly opened on the intermediate package (1). The sealing body (8) is movably connected to the inner wall of the plug hole (15). The sealing body (8) extends downward to cooperate with the flow channel (14). A plasma gun (9) is installed above the second flow chamber (3) and the third flow chamber (4) to heat the liquid surface of the second flow chamber (3) and the third flow chamber (4). A φ20mm heat-resistant stainless steel pipe is welded to the insulation structure (7) and penetrates the insulation structure (7). It is embedded into the cylinder wall at a 45° angle and connected to an external air duct to draw the baking flame away from the blind plate area of ​​the drain outlet. The insulation structure (7) is formed by mixing high-alumina castable. The high-alumina castable ratio is: 70% aggregate, 25% fine powder, and 5% binder. It is injected into the inner cavity of the steel shell of the insulation structure (7) and vibrated to compact it. After standing for 24 hours, it is demolded and baked at 300℃ for 24 hours to form a stable insulation layer.

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