Furnace nose skirt inside slag blowing device and using method thereof

Abstract

The invention discloses a furnace nose skirt inside slag blowing device and a using method thereof. The furnace nose skirt inside slag blowing device comprises an external air inlet, a skirt outside slag blowing pipe, a skirt body, an aluminum pot body and an aluminum pot working liquid level. The aluminum pot body is a basic container, is used for containing high-temperature molten aluminum, is a core area for hot-dip aluminum plating of strip steel, is pool-shaped and is provided with an upward opening; the skirt body belongs to a constituent part of furnace nose equipment and is positioned above the aluminum pot body, and a gap is reserved between the skirt body and the edge of an opening of the aluminum pot body; the aluminum pot working liquid level is the upper surface of aluminum liquid in the aluminum pot body, and the slag blowing pipe is connected to the outer portion of the skirt edge, and the slag blowing outlet is arranged at the tail end and provided with an elbow. And the stability and the production efficiency of the strip steel hot-dip aluminum plating process are effectively improved, and the surface quality and the yield of the strip steel are greatly improved. The whole structure of the device is light and compact, installation can be achieved without large-scale transformation of the furnace nose skirt edge, the normal production process is not affected, and reliable guarantee is provided for continuous and high-quality production of high-temperature metallurgy processes such as hot dip aluminum plating.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous production of galvanized (aluminum) thin plates, and in particular to a slag blowing device inside a furnace nose skirt and a method for using the device. Background Art

[0002] In the field of continuous galvanizing (aluminum) thin sheet production lines, continuous galvanizing (aluminum) boilers face the challenge of cleaning aluminum slag from the surface of the strip steel inside the furnace nose skirt during production. Specifically, the aluminum slag forms due to the oxidation reaction between molten aluminum and air. The suction pumps installed on the furnace nose skirt can only effectively remove the aluminum slag near its side, while the aluminum slag in the middle of the skirt and on the other side of the pump cannot be removed by the pump. This uncleaned aluminum slag adheres to the surface of the strip steel, directly degrading its surface quality. If this slag remains in the strip operating area, it can cause defects such as slag sticking and scratches on the coating surface, affecting product quality. In severe cases, the steel coils cannot meet customer requirements, leading to numerous quality complaints. Furthermore, residual aluminum slag can lead to low yields, significantly increasing production costs.

[0003] Among existing hot-dip aluminum coating technologies, the first is to not install a liquid extraction pump on the furnace nose skirt, relying on the vibration of the strip to dissipate the aluminum slag, thereby reducing the aluminum slag in the strip running area and ensuring the strip surface quality. The second is to install a liquid extraction pump on the furnace nose skirt. This dual action of strip vibration to dissipate the aluminum slag and the liquid extraction pump reduces the aluminum slag in the strip running area and ensures the strip surface quality. Neither method can fundamentally solve the aluminum slag problem.

[0004] With the hot-dip aluminum industry's increasing demands for product surface quality and production efficiency, the development of a compact slag blowing device capable of stable operation in high-temperature environments, precise slag blowing paths, and a compact structure has become a pressing technical challenge. The existing technology lacks a dedicated slag blowing solution specifically designed for the internal cavity structure of the skirt, particularly lacking a technical means to insert the device from below the liquid surface and precisely control the airflow direction using an elbow. Therefore, structural innovation is urgently needed to resolve the core contradiction between efficient aluminum slag removal in high-temperature environments and device reliability.

[0005] Therefore, the applicant, based on many years of rich experience in design, development and actual production in the relevant industry, has conducted research and improvements on the existing structure and deficiencies, and provided a slag blowing device inside the furnace nose skirt and its use method, in order to achieve a more practical purpose. Summary of the Invention

[0006] (1) Technical problems solved

[0007] In response to the shortcomings of the existing technology, the present invention provides a slag blowing device inside the furnace nose skirt and a method for using the device, which solves the problem that the aluminum slag inside the furnace nose skirt affects the strip running area and the traditional device cannot effectively clear the aluminum slag inside the furnace nose skirt and the strip running area, ensuring that the device operates safely and reliably at high temperatures without affecting production.

[0008] (2) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a slag blowing device inside the skirt of a furnace nose, comprising an external air inlet, a slag blowing pipe outside the skirt, a skirt body, an aluminum pot body and an aluminum pot working liquid level; the aluminum pot body is a basic container, which holds high-temperature aluminum liquid and is the core area of ​​hot-dip aluminum plating of strip steel. It is pool-shaped and opens upward; the skirt body is a component of the furnace nose equipment, is located above the aluminum pot body, and has a gap with the opening edge of the aluminum pot body; the aluminum pot working liquid level is the upper surface of the aluminum liquid in the aluminum pot body, and also includes a slag blowing pipe connected to the outside of the skirt and a slag blowing outlet with an elbow at the end; the bottom of the skirt body is open, which is convenient for the slag blowing device to be inserted below the working liquid level of the aluminum pot, so that the slag blowing outlet with the elbow is turned and extends into the inside of the skirt, and a cavity is formed between the inside of the skirt body and the working liquid level of the aluminum pot, which is connected to the furnace nose at the top and the aluminum liquid at the bottom. The cavity is the action area of ​​the slag blowing airflow; the slag blowing pipe is made of high-temperature resistant stainless steel.

[0010] Preferably, an airflow regulating valve is provided at the external air inlet, and the regulating valve includes a high-temperature resistant valve body, a plunger valve core, a pressure gauge, an adjusting knob, a pipe interface 1 and a pipe interface 2. The pipe interface 2 is connected to the external air inlet, and the pipe interface 1 is connected to nitrogen. The airflow pressure can be adjusted to 0.1~0.5MPa, and the air pressure is dynamically adjusted according to the real-time working conditions to ensure a balance between slag blowing efficiency and safety.

[0011] Preferably, the elbow is a large curvature arc elbow, the radius of curvature is 2 to 3 times the diameter of the slag blowing pipe, and the inner wall of the elbow is a smooth surface to reduce pressure loss when airflow passes through.

[0012] Preferably, the slag blowing outlet section of the slag blowing outlet with an elbow adopts a tapered pipe diameter design, and the outlet pipe diameter is smaller than the slag blowing pipe diameter. The air flow velocity is increased through the Venturi effect, the kinetic energy of the slag blowing is enhanced, the aluminum slag is blown away from the strip running area, and then the aluminum slag is pumped out of the skirt through the liquid pump.

[0013] Furthermore, a high-temperature resistant ceramic pump (temperature resistance ≥ 800°C) is used as the liquid extraction pump, and a coarse filter (pore size 2~5mm) is set at the inlet of the slag extraction pipe to prevent blockage by large pieces of aluminum slag.

[0014] Preferably, the high-temperature resistant stainless steel is 310S stainless steel (06Cr25Ni20), which has an oxidation resistance temperature of up to 1100° C., meeting the requirements of long-term oxidation resistance and corrosion resistance.

[0015] The slag blowing pipe can be further divided into an external straight section and an internal curved section, connected via flanges or quick-connect connectors. If the internal curved section becomes worn due to long-term erosion, it can be removed and replaced individually, eliminating the need to scrap the entire section, thus reducing maintenance costs. The curved section of the slag blowing pipe is anchored to the sidewall of the skirt, eliminating the need for welding or cutting the skirt during installation.

[0016] A method for using a slag blowing device inside a furnace nose skirt, using the slag blowing device inside a furnace nose skirt, comprising the following steps:

[0017] S1: Preparation work, perform equipment inspection before startup, and carefully check whether all parts of the slag blowing device are in good condition;

[0018] S2: Install the slag blowing pipe. Insert the slag blowing pipe with a large curvature arc elbow through the opening at the bottom of the skirt body below the working liquid level of the aluminum pot. Make sure that the slag blowing outlet with the elbow is extended into the interior of the skirt through bending and turning. Ensure that the slag blowing outlet is above the working liquid level of the aluminum pot, and form a cavity between the interior of the skirt body and the working liquid level of the aluminum pot, with the top connected to the furnace nose and the bottom connected to the aluminum liquid. This cavity serves as the action area of ​​the slag blowing airflow;

[0019] S3: Ventilation and slag blowing. Open the air flow regulating valve and slowly adjust the regulating knob initially to gradually increase the air flow pressure. Observe the pressure gauge at the same time and adjust the air pressure to 0.1-0.5MPa. Dynamically adjust the air pressure according to the real-time working conditions, such as the amount of aluminum slag and the running speed of the strip, to ensure a balance between slag blowing efficiency and safety.

[0020] S4: The airflow passes through the slag blowing pipe, enters the cavity inside the skirt through the elbow, and is ejected from the slag blowing outlet with an elbow. Since the slag blowing outlet section adopts a tapered pipe diameter design, the airflow speed is increased, generating strong slag blowing kinetic energy, blowing the aluminum slag away from the strip running area.

[0021] S5: After the slag blowing is completed, close the air flow regulating valve and stop the air supply to avoid unnecessary impact caused by continued air flow.

[0022] S6: Check the slag blowing device to see if the slag blowing pipe is damaged or deformed, and whether the air flow regulating valve is reset normally;

[0023] S7: Clean the aluminum slag and use the liquid pump to extract the blown aluminum slag out of the skirt to keep the working area clean;

[0024] S8: Regularly maintain the slag blowing device, especially the slag blowing pipe made of high-temperature resistant stainless steel, and check its oxidation resistance and corrosion resistance to ensure long-term and stable operation of the equipment.

[0025] (3) Beneficial effects

[0026] This invention provides a slag blowing device for the furnace nose skirt and its use method. Compared with existing technologies, it has the following advantages: it effectively improves the stability and production efficiency of the hot-dip aluminizing process for steel strips, and enhances the surface quality and yield rate of the steel strips. The device's overall structure is lightweight and compact, allowing installation without requiring major modifications to the furnace nose skirt, without disrupting normal production processes. It combines ease of operation with cost-effectiveness and practicality, providing reliable assurance for continuous, high-quality production in high-temperature metallurgical processes such as hot-dip aluminizing.

[0027] 1. The slag blowing pipe is made of high-temperature resistant stainless steel. Made of 310S stainless steel, its oxidation resistance temperature can reach 1100°C. It has excellent high-temperature oxidation resistance and corrosion resistance, effectively ensuring the long-term stable operation of the device in a high-temperature environment of 650°C. It avoids the failure problems of traditional materials caused by high-temperature deformation and aluminum liquid corrosion, greatly extending the service life of the slag blowing device, reducing equipment replacement and maintenance costs, and improving production continuity.

[0028] 2. The slag blowing outlet with an elbow can be turned from below the aluminum pot liquid level and then extend into the interior of the skirt body, forming a cavity with the top connected to the furnace nose and the bottom connected to the aluminum liquid. The cavity structure serves as the action area of ​​the slag blowing airflow, which can make the airflow act more concentratedly near the working liquid level of the aluminum pot in a relatively closed space, accurately remove the aluminum slag in the strip running area inside the skirt, and avoid the accumulation of aluminum slag inside the skirt, thereby ensuring the purity of the aluminum liquid in the aluminum pot body, providing a good environment for hot-dip aluminum plating of the strip, improving the coating quality, and increasing the yield rate, and solving the problem of surface quality defects caused by aluminum slag adhering to the strip;

[0029] 3. The air flow regulating valve installed at the external air inlet achieves a balance between slag blowing efficiency and safety. It can ensure sufficient air flow energy for effective slag blowing while avoiding safety hazards or incomplete slag blowing caused by excessively high or low air pressure, thereby improving the adaptability and reliability of the device.

[0030] 4. The elbow adopts a large curvature arc design with a curvature radius of 2 to 3 times the diameter of the slag blowing pipe. The smooth inner wall can significantly reduce the pressure loss of airflow during passage, allowing the airflow to reach the slag blowing area at higher pressure and speed, enhancing the slag blowing effect. At the same time, the slag blowing outlet section of the elbow adopts a tapered pipe diameter design, utilizing the Venturi effect to increase the airflow velocity, further enhancing the kinetic energy of slag blowing and improving slag blowing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of a slag blowing device of the present invention;

[0032] Figure 2 It is an assembly perspective view of the slag blowing device of the present invention;

[0033] Figure 3 This is an assembly appearance diagram of the slag blowing device of the present invention;

[0034] Figure 4 This is a front view of the airflow regulating valve of the present invention;

[0035] Figure 5 A side view of the air flow regulating valve of the present invention;

[0036] In the figure: 1. External air inlet, 2. Slag blowing pipe outside the skirt, 3. Slag blowing outlet with elbow, 4. Skirt body, 5. Aluminum pot body, 6. Aluminum pot working liquid level, 7. High temperature resistant valve body, 8. Pressure gauge, 9. Adjustment knob, 101. Pipe interface 1, 102. Pipe interface 2, DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1 、 Figure 2 As shown, the present invention provides a technical solution: a slag blowing device inside the skirt of a furnace nose, comprising an external air inlet 1, a slag blowing pipe 2 outside the skirt, a skirt body 4, an aluminum pot body 5 and an aluminum pot working liquid level 6; the aluminum pot body 5 is a basic container, which holds high-temperature aluminum liquid and is the core area of ​​hot-dip aluminum plating of strip steel. It is pool-shaped and opens upward; the skirt body 4 is a component of the furnace nose equipment, located above the aluminum pot body 5, with a gap between it and the edge of the opening of the aluminum pot body 5; the aluminum pot working liquid level 6 is the upper surface of the aluminum liquid in the aluminum pot body 5, and also includes a slag blowing pipe 2 connected to the outside of the skirt and a slag blowing outlet 3 with an elbow at the end; the bottom of the skirt body 4 is open, which is convenient for the slag blowing device to be inserted under the working liquid level 6 of the aluminum pot, so that the slag blowing outlet 3 with an elbow is turned and extended into the inside of the skirt, and a cavity is formed between the inside of the skirt body 4 and the working liquid level 6 of the aluminum pot, which is connected to the furnace nose at the top and the aluminum liquid at the bottom. The cavity is the action area of ​​the slag blowing airflow; the slag blowing pipe is made of high-temperature resistant stainless steel.

[0039] like Figure 4 、 Figure 5As shown, an air flow regulating valve is provided at the external air inlet 1, and the regulating valve includes a high temperature resistant valve body 7, a plunger valve core, a pressure gauge 8, an adjusting knob 9, a pipe interface 101 and a pipe interface 2 102. The pipe interface 2 102 is connected to the external air inlet 1, and the pipe interface 101 is connected to nitrogen. The air flow pressure can be adjusted to 0.1~0.5MPa. The air pressure is dynamically adjusted according to the real-time working conditions to ensure a balance between slag blowing efficiency and safety.

[0040] The elbow is a large curvature arc elbow with a curvature radius of 2 to 3 times the diameter of the slag blowing pipe, and the inner wall of the elbow is a smooth surface to reduce the pressure loss when the airflow passes through.

[0041] The slag blowing outlet section of the slag blowing outlet 3 with an elbow adopts a tapered pipe diameter design. The outlet pipe diameter is smaller than the slag blowing pipe diameter. The Venturi effect is used to increase the air flow velocity, enhance the kinetic energy of the slag blowing, blow the aluminum slag away from the strip running area, and then the aluminum slag is pumped out of the skirt through the liquid pump.

[0042] Furthermore, a high-temperature resistant ceramic pump (temperature resistance ≥ 800°C) is used as the liquid extraction pump, and a coarse filter (pore size 2~5mm) is set at the inlet of the slag extraction pipe to prevent blockage by large pieces of aluminum slag.

[0043] The high temperature resistant stainless steel is 310S stainless steel 06Cr25Ni20, and its oxidation resistance temperature can reach 1100℃, meeting the requirements of long-term oxidation resistance and corrosion resistance.

[0044] The slag blowing pipe can be further divided into an external straight section and an internal curved section, connected via flanges or quick-connect connectors. If the internal curved section becomes worn due to long-term erosion, it can be removed and replaced individually, eliminating the need to scrap the entire section, thus reducing maintenance costs. The curved section of the slag blowing pipe is anchored to the sidewall of the skirt, eliminating the need for welding or cutting the skirt during installation.

[0045] A method for using a slag blowing device inside a furnace nose skirt, comprising the following steps:

[0046] S1: Preparation work, perform equipment inspection before startup, and carefully check whether all parts of the slag blowing device are in good condition;

[0047] S2: Install the slag blowing pipe. Insert the slag blowing pipe with a large curvature arc elbow through the opening at the bottom of the skirt body 4 below the working liquid level 6 of the aluminum pot, so that the slag blowing outlet 3 with the elbow can be bent and turned to extend into the interior of the skirt. Ensure that the slag blowing outlet is above the working liquid level 6 of the aluminum pot, and form a cavity between the interior of the skirt body 4 and the working liquid level 6 of the aluminum pot, with the top connected to the furnace nose and the bottom connected to the aluminum liquid. This cavity serves as the action area of ​​the slag blowing airflow;

[0048] S3: Ventilation and slag blowing. Open the air flow regulating valve and initially slowly adjust the regulating knob 9 to gradually increase the air flow pressure. At the same time, observe the pressure gauge 8 and adjust the air pressure to 0.1-0.5MPa. Dynamically adjust the air pressure according to the real-time working conditions, such as the amount of aluminum slag and the running speed of the strip, to ensure a balance between slag blowing efficiency and safety.

[0049] S4: The airflow passes through the slag blowing pipe, enters the cavity inside the skirt through the elbow, and is ejected from the slag blowing outlet 3 with an elbow. Since the slag blowing outlet section adopts a tapered pipe diameter design, the airflow velocity is increased, generating strong slag blowing kinetic energy, blowing the aluminum slag away from the strip running area.

[0050] S5: After the slag blowing is completed, close the air flow regulating valve and stop the air supply to avoid unnecessary impact caused by continued air flow.

[0051] S6: Check the slag blowing device to see if the slag blowing pipe is damaged or deformed, and whether the air flow regulating valve is reset normally;

[0052] S7: Clean the aluminum slag and use the liquid pump to extract the blown aluminum slag out of the skirt to keep the working area clean;

[0053] S8: Regularly maintain the slag blowing device, especially the slag blowing pipe made of high-temperature resistant stainless steel, and check its oxidation resistance and corrosion resistance to ensure long-term and stable operation of the equipment.

[0054] Example 1: During operation, slag blowing is applied under high load conditions.

[0055] When the speed of the strip hot-dip aluminum coating production line is increased to 150m / min, the oxidation of the aluminum liquid is intensified, and the amount of aluminum slag accumulated inside the skirt will increase compared with the normal working conditions. The specific operation steps are as follows:

[0056] The slag blowing pipe material is replaced with 310S stainless steel (06Cr25Ni20) to meet the high temperature resistance requirements of high load conditions.

[0057] Check that the curvature radius of the elbow is 2.5 times the diameter of the slag blowing pipe (pipe diameter 20mm, curvature radius 50mm), and the inner wall roughness Ra ≤ 0.8μm to reduce the pressure loss when the airflow passes through.

[0058] Start the air flow regulating valve and slowly increase the nitrogen pressure to 0.3 MPa initially. After observing that the pressure gauge is stable, dynamically adjust it to 0.4 MPa according to the real-time aluminum slag amount.

[0059] Since the slag blowing outlet section adopts a tapered pipe diameter design (inlet pipe diameter 20mm, outlet pipe diameter 15mm), the Venturi effect is used to increase the air flow velocity.

[0060] During the slag blowing process, a high-temperature resistant ceramic liquid pump (temperature resistant to 850°C) is started simultaneously, and a coarse filter (pore size 3mm) at the inlet of the slag extraction pipe intercepts large pieces of aluminum slag to ensure that the blown aluminum slag is discharged in time.

[0061] In Example 2, after the slag blowing device has been running continuously for several days, the internal curved pipe section has been slightly worn due to long-term erosion and needs to be partially replaced.

[0062] First, quickly disassemble and disconnect the flange connection (PN16, DN25) between the external straight pipe section and the internal curved pipe section of the slag blowing pipe. It only takes 15 minutes to complete the separate disassembly of the curved pipe section without disassembling the skirt body.

[0063] Then the components were inspected and replaced. The removed elbow section was tested for flaws and the inner wall was found to be worn. To ensure the slag blowing effect, a new 310S stainless steel elbow section was replaced. The sealing surface of the plunger valve core of the air flow control valve was checked and found to have no signs of high temperature oxidation. No replacement was required.

[0064] Then reset and debug, install the new elbow section, and then conduct an air tightness test (0.6MPa nitrogen pressure for 5 minutes, pressure drop ≤0.02MPa).

[0065] Finally, the airflow uniformity of the slag blowing outlet was debugged. After the replacement, the slag blowing efficiency of the device was restored to the initial state, ensuring the continuous operation stability of the production line.

[0066] In summary, the stability and production efficiency of the hot-dip aluminum coating process for steel strip have been effectively improved, along with the surface quality and yield rate of the strip. The device's overall structure is lightweight and compact, allowing installation without requiring major modifications to the furnace nose skirt, thus maintaining normal production flow. It combines ease of operation with cost-effectiveness, providing reliable support for continuous, high-quality production in high-temperature metallurgical processes such as hot-dip aluminum coating.

[0067] The slag blowing pipe is made of high-temperature resistant stainless steel, and is made of 310S stainless steel. Its oxidation resistance temperature can reach 1100°C, and it has excellent high-temperature oxidation resistance and corrosion resistance. This effectively ensures the long-term stable operation of the device in a high-temperature environment of 650°C, avoiding the failure problems of traditional materials caused by high-temperature deformation and aluminum liquid corrosion, greatly extending the service life of the slag blowing device, reducing equipment replacement and maintenance costs, and improving production continuity.

[0068] The slag blowing outlet with an elbow can be turned from below the aluminum pot liquid level and then extend into the interior of the skirt body, forming a cavity with the top connected to the furnace nose and the bottom connected to the aluminum liquid. The cavity structure serves as the action area of ​​the slag blowing airflow, which can make the airflow act more concentratedly near the working liquid level of the aluminum pot in a relatively closed space, accurately remove the aluminum slag in the strip running area inside the skirt, and avoid the accumulation of aluminum slag inside the skirt, thereby ensuring the purity of the aluminum liquid in the aluminum pot body, providing a good environment for hot-dip aluminum plating of the strip, improving the coating quality, and increasing the yield rate, and solving the problem of surface quality defects caused by aluminum slag adhering to the strip.

[0069] The air flow regulating valve installed at the external air inlet achieves a balance between slag blowing efficiency and safety. It can ensure sufficient air flow energy for effective slag blowing, while avoiding safety hazards or incomplete slag blowing caused by excessively high or low air pressure, thereby improving the adaptability and reliability of the device.

[0070] The elbow features a large arc curvature, with a radius of curvature 2-3 times the diameter of the slag blowing pipe. Its smooth inner wall significantly reduces pressure loss during airflow, allowing the airflow to reach the slag blowing area at higher pressure and velocity, enhancing the slag blowing effect. Furthermore, the slag blowing outlet section of the elbow features a tapered diameter design, leveraging the Venturi effect to increase airflow velocity, further enhancing kinetic energy and improving slag blowing efficiency.

[0071] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A slag blowing device inside a furnace nose skirt, comprising an external air inlet (1), a slag blowing pipe (2) outside the skirt, a skirt body (4), an aluminum pot body (5) and an aluminum pot working liquid level (6); the aluminum pot body (5) is a basic container for holding high-temperature aluminum liquid, is the core area of ​​hot-dip aluminum plating of steel strips, is pool-shaped, and has an upward opening; the skirt body (4) is a component of the furnace nose equipment, is located above the aluminum pot body (5), and has a gap with the opening edge of the aluminum pot body (5); the aluminum pot working liquid level (6) is the upper surface of the aluminum liquid in the aluminum pot body (5), and is characterized in that: The invention also includes a slag blowing pipe (2) connected to the outside of the skirt and a slag blowing outlet (3) with an elbow at the end; the bottom of the skirt body (4) is open, so that the slag blowing device is inserted below the working liquid level (6) of the aluminum pot, so that the slag blowing outlet (3) with the elbow is turned and extends into the inside of the skirt, and a cavity is formed between the inside of the skirt body (4) and the working liquid level (6) of the aluminum pot, the top of which is connected to the furnace nose and the bottom is connected to the aluminum liquid, and the cavity is the action area of ​​the slag blowing airflow; the slag blowing pipe is made of high-temperature resistant stainless steel.

2. The internal slag blowing device of the furnace nose skirt according to claim 1, characterized in that: An air flow regulating valve is provided at the external air inlet (1), and the regulating valve comprises a high temperature resistant valve body (7), a plunger valve core, a pressure gauge (8), an adjusting knob (9), a pipe interface 1 (101) and a pipe interface 2 (102). The pipe interface 2 (102) is connected to the external air inlet (1), and the pipe interface 1 (101) is connected to nitrogen. The air flow pressure can be adjusted to 0.1-0.5 MPa, and the air pressure is dynamically adjusted according to the real-time working conditions to ensure a balance between slag blowing efficiency and safety.

3. The internal slag blowing device of the furnace nose skirt according to claim 2, characterized in that: The elbow is a large curvature arc elbow, the curvature radius of which is 2 to 3 times the diameter of the slag blowing pipe, and the inner wall of the elbow is a smooth surface to reduce pressure loss when air flows through.

4. The slag blowing device inside the furnace nose skirt according to claim 3, characterized in that: The slag blowing outlet section of the elbowed slag blowing outlet (3) adopts a tapered pipe diameter design, and the outlet pipe diameter is smaller than the slag blowing pipe diameter. The air flow velocity is increased through the Venturi effect, the slag blowing kinetic energy is enhanced, the aluminum slag is blown away from the strip running area, and then the aluminum slag is pumped out of the skirt through the liquid pump.

5. The slag blowing device inside the furnace nose skirt according to claim 4, characterized in that: The high-temperature resistant stainless steel is 310S stainless steel (06Cr25Ni20), which has an oxidation resistance temperature of up to 1100°C and meets the requirements of long-term oxidation resistance and corrosion resistance.

6. A method for using a slag blowing device inside a furnace nose skirt, characterized in that: The slag blowing device inside the furnace nose skirt described in any one of 1-5 is used, comprising the following steps: S1: Preparation work, perform equipment inspection before startup, and carefully check whether all parts of the slag blowing device are in good condition; S2: Install the slag blowing pipe. Insert the slag blowing pipe with a large curvature arc elbow through the opening at the bottom of the skirt body (4) below the working liquid level (6) of the aluminum pot, so that the slag blowing outlet (3) with the elbow can be extended into the interior of the skirt by bending and turning, ensuring that the slag blowing outlet is located above the working liquid level (6) of the aluminum pot, and a cavity is formed between the interior of the skirt body (4) and the working liquid level (6) of the aluminum pot, with the top connected to the furnace nose and the bottom connected to the aluminum liquid, and the cavity serves as the action area of ​​the slag blowing airflow; S3: Ventilation and slag blowing. Open the air flow regulating valve and slowly adjust the regulating knob (9) initially to gradually increase the air flow pressure. Observe the pressure gauge (8) at the same time and adjust the air pressure to 0.1-0.5 MPa. Dynamically adjust the air pressure according to the real-time working conditions, such as the amount of aluminum slag and the running speed of the strip, to ensure a balance between slag blowing efficiency and safety. S4: The airflow passes through the slag blowing pipe, enters the cavity inside the skirt through the elbow, and is ejected from the slag blowing outlet (3) with an elbow. Since the slag blowing outlet section adopts a tapered pipe diameter design, the airflow speed is increased, forming a strong slag blowing kinetic energy, blowing the aluminum slag away from the strip running area. S5: After the slag blowing is completed, close the air flow regulating valve and stop the air supply to avoid unnecessary impact caused by continued air flow. S6: Check the slag blowing device to see if the slag blowing pipe is damaged or deformed, and whether the air flow regulating valve is reset normally; S7: Clean the aluminum slag and use the liquid pump to extract the blown aluminum slag out of the skirt to keep the working area clean; S8: Regularly maintain the slag blowing device, especially the slag blowing pipe made of high-temperature resistant stainless steel, and check its oxidation resistance and corrosion resistance to ensure long-term and stable operation of the equipment.

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