A furnace nozzle skirt inner slag blowing device

Abstract

The utility model discloses a kind of furnace nose skirt edge internal slag blowing devices, including external connection air inlet, skirt edge outside's slag blowing pipe, skirt edge body, aluminium pot body and aluminium pot working liquid level;Aluminium pot body is basic container, and high-temperature aluminium liquid is contained, is the core area of strip steel hot-dip aluminizing, pool-shaped, opening upward;Skirt edge body belongs to the component part of furnace nose equipment, located in aluminium pot body top, and there is gap with aluminium pot body opening edge;Aluminium pot working liquid level is the upper surface of aluminium liquid in aluminium pot body, further include the slag blowing pipe and the end of the elbow's slag blowing outlet connected to skirt edge outside. The stability and production efficiency of strip steel hot-dip aluminizing process are effectively improved, and strip steel surface quality and yield are greatly improved. Device overall structure is light and compact, without large-scale modification to furnace nose skirt edge can be realized installation, without affecting normal production process, for hot-dip aluminizing and other high-temperature metallurgical process continuous, high-quality production provides reliable guarantee.

Description

Technical Field

[0001] This utility model relates to the field of continuous production technology of galvanized (aluminum) sheet metal, specifically to a slag blowing device inside the skirt of a furnace nose. Background Technology

[0002] In the field of continuous production line technology for galvanized (aluminum) sheet metal, the continuous galvanizing (aluminum) furnace faces the challenge of cleaning aluminum dross from the surface of the strip steel inside the furnace nose skirt during production. Specifically, aluminum dross forms due to the oxidation reaction caused by the contact of molten aluminum with air. The pumps equipped on the furnace nose skirt can only effectively remove aluminum dross from the vicinity of its side, while dross in the middle of the skirt and on the other side of the pump cannot be removed. This unremoved aluminum dross adheres to the surface of the strip steel, directly leading to a decline in the surface quality. If this dross is present in the strip steel operating area, it can cause defects such as slag adhesion 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, aluminum dross residue also causes low yield, resulting in a significant increase in production costs.

[0003] In existing hot-dip galvanizing technologies, the first method does not have a pump at the furnace nose skirt, relying on the vibration of the strip during operation to disperse aluminum dross and reduce dross in the strip's running area, thus ensuring strip surface quality. The second method has a pump at the furnace nose skirt, using both the vibration of the strip during operation and the pump's combined action to reduce dross in the running area and maintain strip surface quality. Neither method fundamentally solves the aluminum dross problem.

[0004] With the increasing demands for product surface quality and production efficiency in the hot-dip aluminizing industry, developing a slag-blowing device that can operate stably in high-temperature environments, has a precise slag-blowing path, and a compact structure has become an urgent technical problem to be solved. Existing technologies lack dedicated slag-blowing solutions designed for the internal cavity structure of the skirt, and especially lack technical means to insert from below the liquid surface and use bends to achieve precise airflow direction control. Therefore, structural innovation is urgently needed to resolve the core contradiction between efficient aluminum slag removal and device reliability in high-temperature environments.

[0005] Therefore, based on its many years of experience in design, development and actual production in the relevant industry, the applicant has studied and improved the existing structure and its shortcomings, and provided a slag blowing device inside the skirt of the furnace nose, in order to achieve a more practical purpose. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this utility model provides a slag blowing device inside the furnace nose skirt, which solves the problem that aluminum slag inside the furnace nose skirt affects the strip running area and that traditional devices cannot effectively remove aluminum slag inside the furnace nose skirt and in the strip running area, ensuring that the device can operate safely and reliably at high temperatures without affecting production.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: 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 surface; the aluminum pot body is the basic container, holding high-temperature molten aluminum, and is the core area for hot-dip galvanizing of steel strips, shaped like a pool with its opening facing upwards; the skirt body is a component of the furnace nose device, located above the aluminum pot body, with a gap between it and the edge of the opening of the aluminum pot body; the aluminum pot working liquid surface is the upper surface of the molten aluminum inside the aluminum pot body, and also includes a slag blowing pipe connected to the outside of the skirt and a slag blowing outlet with a bend at the end; the bottom of the skirt body is open, facilitating the insertion of the slag blowing device below the working liquid surface of the aluminum pot, causing the bend-headed slag blowing outlet to turn and extend into the interior of the skirt, forming a cavity between the interior of the skirt body and the working liquid surface of the aluminum pot, with the top connected to the furnace nose and the bottom connected to the molten aluminum, which is the area where the slag blowing airflow acts; the slag blowing pipe is made of high-temperature resistant stainless steel.

[0010] Preferably, the external air inlet is equipped with an airflow regulating valve, which includes a high-temperature resistant valve body, a plunger-type valve core, a pressure gauge, an adjusting knob, a pipe interface one, and a pipe interface two. The pipe interface two is connected to the external air inlet, and the pipe interface one is connected to nitrogen. The airflow pressure can be adjusted to 0.1~0.5MPa, and the air pressure can be 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 circular 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 pressure loss when the airflow passes through.

[0012] Preferably, the slag blowing outlet section with elbow adopts a tapered pipe diameter design, with the outlet pipe diameter being smaller than the slag blowing pipe diameter. This increases the airflow velocity through the Venturi effect, enhances the slag blowing kinetic energy, blows the aluminum slag away from the strip running area, and then extracts the aluminum slag from inside the skirt using a liquid pump.

[0013] The further pumping pump adopts a high-temperature resistant ceramic pump (temperature resistance ≥800℃), and a coarse filter screen (pore size 2~5mm) is installed at the inlet of the slag extraction pipe to prevent large pieces of aluminum slag from clogging.

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

[0015] The slag blowing pipe can be further divided into an external straight pipe section and an internal bend section, connected by flanges or quick couplings. When the internal bend wears down due to long-term scouring, it can be disassembled and replaced individually without the need for complete scrapping, reducing maintenance costs. The bend of the slag blowing pipe is secured to the side wall of the skirt, eliminating the need for welding or cutting modifications to the skirt during installation.

[0016] (III) Beneficial Effects

[0017] This invention provides a slag blowing device inside the furnace nose skirt, which, compared with existing technologies, has the following advantages: it effectively improves the stability and production efficiency of the hot-dip aluminizing process for strip steel, and enhances the surface quality and yield of the strip steel. The device has a lightweight and compact overall structure, requiring no large-scale modification of the furnace nose skirt for installation, and does not affect normal production processes. It combines ease of operation with economic practicality, providing a reliable guarantee for the continuous and high-quality production of high-temperature metallurgical processes such as hot-dip aluminizing.

[0018] 1. The slag blowing pipe is made of high-temperature resistant stainless steel, specifically 310S stainless steel, which has an oxidation resistance temperature of up to 1100℃. It has excellent high-temperature oxidation resistance and corrosion resistance, effectively ensuring long-term stable operation of the equipment in a high-temperature environment of 650℃. This avoids the failure problems caused by high-temperature deformation and aluminum corrosion of traditional materials, greatly extending the service life of the slag blowing device, reducing equipment replacement and maintenance costs, and improving the continuity of production.

[0019] 2. The slag blowing outlet with an elbow can turn from below the aluminum pot liquid surface and extend into the interior of the skirt body, forming a cavity between the top of the outlet and the working liquid surface of the aluminum pot, which is connected to the furnace nose and the bottom of the aluminum liquid. The cavity structure serves as the action area of ​​the slag blowing airflow, which allows the airflow to act more concentratedly on the vicinity of the working liquid surface of the aluminum pot in a relatively enclosed space, accurately removing aluminum slag from the strip running area inside the skirt, avoiding 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 galvanizing of the strip, improving the coating quality, increasing the yield, and solving the problem of surface quality defects caused by aluminum slag adhering to the strip.

[0020] 3. The airflow regulating valve installed at the external air inlet achieves a balance between slag blowing efficiency and safety. It can ensure sufficient airflow energy for effective slag blowing, while avoiding safety hazards or incomplete slag blowing caused by excessively high or low air pressure, thus improving the adaptability and reliability of the device.

[0021] 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, and a smooth inner wall. This significantly reduces pressure loss during airflow, allowing the airflow to reach the slag blowing area with higher pressure and velocity, thus enhancing the slag blowing effect. Simultaneously, the slag blowing outlet section with the elbow features a tapered pipe diameter design, utilizing the Venturi effect to increase airflow velocity, further enhancing slag blowing kinetic energy and improving slag blowing efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the slag blowing device of this utility model;

[0023] Figure 2 This is an assembly perspective view of the slag blowing device of this utility model;

[0024] Figure 3 This is an assembly appearance drawing of the slag blowing device of this utility model;

[0025] Figure 4 This is a front view of the airflow regulating valve of this utility model;

[0026] Figure 5 This is a side view of the airflow regulating valve of this utility model;

[0027] In the diagram: 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. Working liquid level in the aluminum pot; 7. High-temperature resistant valve body; 8. Pressure gauge; 9. Adjustment knob; 101. Pipe interface one; 102. Pipe interface two. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 , Figure 2As shown, this utility model provides a technical solution: a slag blowing device inside the skirt of a furnace nose, including 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 surface 6; the aluminum pot body 5 is the basic container, holding high-temperature aluminum liquid, and is the core area of ​​hot-dip galvanizing of steel strip, shaped like a pool with its opening facing upward; the skirt body 4 is a component of the furnace nose device, 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 surface 6 is the upper surface of the aluminum liquid inside 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 a bend at the end; the bottom of the skirt body 4 is open, making it easy for the slag blowing device to be inserted under the aluminum pot working liquid surface 6, so that the slag blowing outlet 3 with the bend turns and extends into the inside of the skirt, and a cavity is formed between the inside of the skirt body 4 and the aluminum pot working liquid surface 6, with the top communicating with the furnace nose and the bottom communicating with the aluminum liquid, and this cavity is the area where the slag blowing airflow acts; the slag blowing pipe is made of high-temperature resistant stainless steel.

[0030] like Figure 4 , Figure 5 As shown, an airflow regulating valve is provided at the external air inlet 1. The regulating valve includes a high-temperature resistant valve body 7, a plunger-type valve core, a pressure gauge 8, an adjusting knob 9, a pipe interface 101 and a pipe interface 102. The pipe interface 102 is connected to the external air inlet 1, and the pipe interface 101 is connected to nitrogen. The airflow 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.

[0031] The elbow is a large-curvature circular 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 pressure loss when the airflow passes through.

[0032] The slag outlet section of the slag outlet 3 with elbow adopts a tapered pipe diameter design, with the outlet pipe diameter being smaller than the slag blowing pipe diameter. By using the Venturi effect, the airflow velocity is increased, enhancing the slag blowing kinetic energy and blowing the aluminum slag away from the strip running area. Then, the aluminum slag is extracted from the skirt by the liquid pump.

[0033] The further pumping pump adopts a high-temperature resistant ceramic pump (temperature resistance ≥800℃), and a coarse filter screen (pore size 2~5mm) is installed at the inlet of the slag extraction pipe to prevent large pieces of aluminum slag from clogging.

[0034] The high-temperature resistant stainless steel is 310S stainless steel 06Cr25Ni20, which has an oxidation resistance temperature of up to 1100℃, meeting the requirements for long-term oxidation resistance and corrosion resistance.

[0035] The slag blowing pipe can be further divided into an external straight pipe section and an internal bend section, connected by flanges or quick couplings. When the internal bend wears down due to long-term scouring, it can be disassembled and replaced individually without the need for complete scrapping, reducing maintenance costs. The bend of the slag blowing pipe is secured to the side wall of the skirt, eliminating the need for welding or cutting modifications to the skirt during installation.

[0036] In the first embodiment, during operation, the slag blowing pipe with a large curvature arc bend is inserted into the working liquid surface 6 of the aluminum pot through the opening at the bottom of the skirt body 4. The slag blowing outlet 3 with the bend can be extended into the skirt by bending and turning, ensuring that the slag blowing outlet is above the working liquid surface 6 of the aluminum pot. A cavity is formed between the inside of the skirt body 4 and the working liquid surface 6 of the aluminum pot, with the top communicating with the furnace nose and the bottom communicating with the aluminum liquid. This cavity serves as the area where the slag blowing airflow acts.

[0037] Open the airflow regulating valve and initially adjust the regulating knob 9 slowly to gradually increase the airflow pressure while observing the pressure gauge 8. Adjust the air pressure to 0.1-0.5 MPa. Dynamically adjust the air pressure according to real-time operating conditions, such as the amount of aluminum slag and the strip running speed, to ensure a balance between slag blowing efficiency and safety. The airflow passes through the slag blowing pipe, enters the cavity inside the skirt via the bend, and is ejected from the slag blowing outlet 3 with the bend. Due to the tapered pipe diameter design at the slag blowing outlet section, the airflow velocity is increased, generating strong slag blowing kinetic energy that blows the aluminum slag away from the strip running area.

[0038] After the slag blowing is completed, first close the airflow regulating valve to stop the air supply and prevent the airflow from continuing to spray out and causing unnecessary damage. Then clean the aluminum slag by using a liquid pump to extract the blown-off aluminum slag from inside the skirt, keeping the work area clean.

[0039] In summary, this method effectively improves the stability and production efficiency of the hot-dip aluminizing process for strip steel, and enhances the surface quality and yield of the strip steel. The overall structure of the device is lightweight and compact, requiring no large-scale modifications to the furnace nose skirt for installation, without affecting normal production processes. It combines ease of operation with economic practicality, providing a reliable guarantee for the continuous and high-quality production of high-temperature metallurgical processes such as hot-dip aluminizing.

[0040] The slag blowing pipe is made of high-temperature resistant stainless steel, specifically 310S stainless steel, which has an oxidation resistance temperature of up to 1100℃. It has excellent high-temperature oxidation resistance and corrosion resistance, effectively ensuring long-term stable operation of the equipment in a high-temperature environment of 650℃. This avoids the failure problems caused by high-temperature deformation and aluminum corrosion of traditional materials, greatly extending the service life of the slag blowing device, reducing equipment replacement and maintenance costs, and improving the continuity of production.

[0041] The slag blowing outlet with an elbow can turn from below the aluminum pot liquid surface and extend into the interior of the skirt body, forming a cavity between the top of the outlet and the working liquid surface of the aluminum pot, which is connected to the furnace nose and the bottom of the aluminum liquid. The cavity structure serves as the action area for the slag blowing airflow, which allows the airflow to act more concentratedly on the vicinity of the working liquid surface of the aluminum pot in a relatively enclosed space. This accurately removes aluminum slag from the strip running area inside the skirt, preventing aluminum slag from accumulating inside the skirt. This ensures the purity of the aluminum liquid inside the aluminum pot body, provides a good environment for hot-dip aluminum galvanizing of the strip, improves the coating quality, increases the yield, and solves the problem of surface quality defects caused by aluminum slag adhering to the strip.

[0042] The airflow regulating valve installed at the external air inlet achieves a balance between slag blowing efficiency and safety. It ensures sufficient airflow energy for effective slag blowing while avoiding safety hazards or incomplete slag blowing caused by excessively high or low air pressure, thus improving the adaptability and reliability of the device.

[0043] The elbow features a large-curvature arc design with a radius of curvature 2-3 times the diameter of the slag blowing pipe and a smooth inner wall. This significantly reduces pressure loss during airflow, allowing the airflow to reach the slag blowing area at higher pressure and velocity, thus enhancing the slag blowing effect. Simultaneously, the slag blowing outlet section with the elbow employs a tapered pipe diameter design, utilizing the Venturi effect to increase airflow velocity, further enhancing slag blowing kinetic energy and improving slag blowing efficiency.

[0044] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A furnace nose skirt internal slag blowing device, 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 surface (6); the aluminum pot body (5) is a basic container, holding high-temperature aluminum liquid, and is the core area of ​​hot-dip aluminizing of strip steel, in the shape of a pool with an upward opening; the skirt body (4) is a component of the furnace nose device, located above the aluminum pot body (5), with a gap between it and the opening edge of the aluminum pot body (5); the aluminum pot working liquid surface (6) is the upper surface of the aluminum liquid inside the aluminum pot body (5), characterized in that: It also includes a slag blowing pipe (2) connected to the outside of the skirt and a slag blowing outlet (3) with a bend at the end; the bottom of the skirt body (4) is open, so that the slag blowing device can be inserted into the working liquid surface (6) of the aluminum pot, so that the slag blowing outlet (3) with the bend can be turned and extended into the inside of the skirt. A cavity is formed between the inside of the skirt body (4) and the working liquid surface (6) of the aluminum pot, with the top connected to the furnace nose and the bottom connected to the aluminum liquid. This cavity is the area where the slag blowing airflow acts; the slag blowing pipe is made of high temperature resistant stainless steel.

2. The slag blowing device inside the skirt of a furnace nose according to claim 1, characterized in that: An airflow regulating valve is provided at the external air inlet (1). 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 one (101), and a pipe interface two (102). The pipe interface two (102) is connected to the external air inlet (1), and the pipe interface one (101) is connected to nitrogen. The airflow 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.

3. The slag blowing device inside the skirt of a furnace nose according to claim 2, characterized in that: The elbow is a large-curvature circular 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 pressure loss when the airflow passes through.

4. The slag blowing device inside the skirt of a furnace nose according to claim 3, characterized in that: The slag outlet section of the slag outlet (3) with elbow adopts a tapered pipe diameter design. The outlet pipe diameter is smaller than the slag blowing pipe diameter. The airflow speed is increased by the Venturi effect, which enhances the slag blowing kinetic energy and blows the aluminum slag away from the strip steel running area. Then, the aluminum slag is extracted from the skirt by the liquid pump.

5. A slag blowing device inside the skirt of a furnace nose 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℃, meeting the requirements for long-term oxidation resistance and corrosion resistance.

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