Two-way sealing and cooling device for corner of rectangular furnace wall

Abstract

The application provides a rectangular furnace wall corner two-way sealing and cooling device, which comprises a side wall cooling plate, an end wall cooling plate and a corner cooling plate. The side wall cooling plate is tightly attached to the side wall of the furnace at the corner. The end wall cooling plate is tightly attached to the end wall of the furnace at the corner. The corner gap is formed between the end wall cooling plate and the side wall cooling plate. The corner cooling plate is inserted into the corner gap and tightly attached to the side wall cooling plate and the end wall cooling plate. The corner cooling plate has a first extension section extending along the length direction of the side wall cooling plate and a second extension section extending along the length direction of the end wall cooling plate. The first extension section and the second extension section are perpendicular to each other, forming an L-shaped structure. The application can cool the corner of the furnace, rapidly solidify the leakage melt through the strong cooling effect, and reduce the leakage risk from the source. By arranging the corner cooling plate, the through gap at the corner of the furnace can be avoided, and the sealing performance is improved.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a bidirectional sealing cooling device for the corner of a rectangular furnace wall. Background Technology

[0002] In modern metallurgical industry, rectangular metallurgical furnaces are widely used in various furnace types such as side-blown furnaces, top-blown furnaces, and electric furnaces due to their advantages of compact structure, convenient operation, and high thermal efficiency. As the metallurgical field continues to develop towards higher smelting intensity, the supporting furnaces are also moving towards ultra-high temperature and large scale, with operating temperatures generally reaching over 1400℃ and furnace lengths increasing to tens of meters. However, the furnace width is usually limited by factors such as smelting processes and operating space, typically only a dozen meters wide, forming the typical rectangular structural feature of being "long and narrow".

[0003] Because furnace lining materials undergo thermal expansion at high temperatures, and under the same temperature change conditions, the expansion along the length of the furnace body is much greater than that along its width, this significant difference in expansion creates complex stress concentrations at the four corners of the rectangular furnace body. This disrupts the stress balance of the furnace structure, leading to unavoidable relative displacement of the refractory material at the corners and the appearance of gaps. These gaps cause leakage of high-temperature molten materials, flue gas, and other media inside the furnace, severely affecting the normal and continuous operation of the furnace and reducing production efficiency. They can also burn and corrode the furnace steel structure, damage surrounding equipment, and even trigger safety accidents such as high-temperature splashing. Furthermore, they cause energy waste and environmental pollution, becoming a major bottleneck restricting the high-quality development of the metallurgical industry. Existing conventional protective measures are insufficient to fundamentally solve this problem.

[0004] In actual production, companies often resort to passive repair methods. This typically involves filling the cracks at the four corners of the furnace body with monolithic refractory or covering the cracks with steel plates to temporarily block molten metal penetration and leakage. Essentially, this is a temporary on-site remedial measure and a passive response strategy. While this repair method can temporarily seal the cracks and stop molten metal penetration, it fails to address the root cause of the problem. Under high-temperature alternating loads, the existing cracks easily widen again due to the thermal expansion and contraction of the furnace body, leading to the detachment of repair materials or deformation of the steel plates. Frequent maintenance is required, increasing production costs and failing to fundamentally eliminate the risk of leakage; it only maintains short-term stability. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art. To this end, embodiments of the present invention provide a bidirectional sealing cooling device for the corner of a rectangular furnace wall, which can cool the corner of the furnace and prevent through gaps from forming at the corner.

[0006] This invention provides a bidirectional sealing cooling device for the corner of a rectangular furnace wall, comprising a cooling plate, which includes a side wall cooling plate, an end wall cooling plate, and a corner cooling plate. The side wall cooling plate is tightly fitted to the outer wall of the furnace side wall at the corner and is fixedly connected to the furnace side wall. The end wall cooling plate is tightly fitted to the outer wall of the furnace end wall at the corner and is fixedly connected to the furnace end wall. A corner notch with an included angle of 90° is formed between the end wall cooling plate and the adjacent side wall cooling plate. The corner cooling plate is inserted into the corner notch and is tightly fitted to the end face of the side wall cooling plate and the end face of the end wall cooling plate, respectively. The corner cooling plate has a first contact surface that abuts against the side wall cooling plate and a second contact surface that abuts against the end wall cooling plate. The length of the first contact surface is greater than the width of the side wall cooling plate, and the length of the second contact surface is greater than the width of the end wall cooling plate.

[0007] In some embodiments, the corner cooling plate has a first extension extending along the length direction of the sidewall cooling plate and a second extension extending along the length direction of the endwall cooling plate, the first extension and the second extension being perpendicular to each other to form an L-shaped structure.

[0008] In some embodiments, the height of the cooling plate is greater than or equal to the height of the molten pool inside the furnace, and the heights of the side wall cooling plate, end wall cooling plate, and corner cooling plate are equal.

[0009] In some embodiments, the side wall cooling plate, end wall cooling plate, and corner cooling plate each have a cooling cavity inside, the cooling cavity is filled with a cooling medium, and the cooling cavity has a medium inlet and a medium outlet, which are respectively connected to flow control valves.

[0010] In some embodiments, the cooling medium is water, inert gas, or mineral cooling oil.

[0011] In some embodiments, the side wall cooling plate, end wall cooling plate, and corner cooling plate are made of copper, steel, or copper-steel composite material.

[0012] In some embodiments, the sidewall cooling plate is fixedly connected to the furnace body sidewall by bolts, and the endwall cooling plate is fixedly connected to the furnace body endwall by bolts.

[0013] In some embodiments, the side wall cooling plate is inserted into the furnace body side wall and then fixedly connected by bolts, and the end wall cooling plate is inserted into the furnace body end wall and then fixedly connected by bolts.

[0014] In some embodiments, the rectangular furnace wall corner bidirectional sealing cooling device further includes a temperature monitoring device to monitor the outer surface temperature of the side wall cooling plate, end wall cooling plate, and corner cooling plate or the temperature of the cooling medium. The temperature monitoring device is electrically connected to a temperature alarm.

[0015] In some embodiments, a displacement monitoring device is provided on the corner cooling plate to monitor the displacement of the side wall cooling plate and the end wall cooling plate relative to the corner cooling plate. The displacement monitoring device is electrically connected to a displacement alarm. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings. Figure 1 This is a schematic diagram illustrating the use of the bidirectional sealing and cooling device at the corner of the rectangular furnace wall according to an embodiment of the present invention. Figure 2 A schematic diagram of a cooling device without corner cooling plates; Figure 3 A schematic diagram showing a through-type gap that occurs when a cooling device without corner cooling plates is in use; Figure label: 1. Side wall cooling plate; 2. End wall cooling plate; 3. Corner cooling plate; 31. First extension section; 32. Second extension section. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] The following describes an embodiment of the rectangular furnace wall corner bidirectional sealing cooling device with reference to the accompanying drawings.

[0019] like Figure 1 As shown in the figure, an embodiment of the present invention proposes a bidirectional sealing cooling device for the corner of a rectangular furnace wall, including a cooling plate. The cooling plate includes a side wall cooling plate 1, an end wall cooling plate 2, and a corner cooling plate 3. The side wall cooling plate 1 is tightly fitted to the outer wall of the furnace side wall at the corner and is fixedly connected to the furnace side wall. The end wall cooling plate 2 is tightly fitted to the outer wall of the furnace end wall at the corner and is fixedly connected to the furnace end wall. A corner notch with an included angle of 90° is formed between the end wall cooling plate 2 and the adjacent side wall cooling plate 1. The corner cooling plate 3 is inserted into the corner notch and is tightly fitted to the end face of the side wall cooling plate 1 and the end face of the end wall cooling plate 2, respectively. The corner cooling plate 3 has a first contact surface that abuts against the side wall cooling plate 1 and a second contact surface that abuts against the end wall cooling plate 2. The length of the first contact surface is greater than the width of the side wall cooling plate 1, and the length of the second contact surface is greater than the width of the end wall cooling plate 2.

[0020] This invention, through the installation of side wall cooling plates 1, end wall cooling plates 2, and corner cooling plates 3, can cool the corners of the furnace, rapidly solidifying the leaking melt through a strong cooling effect, thus reducing the risk of leakage at the source. The corner cooling plates 3 effectively adapt to the thermal expansion and displacement characteristics of the furnace, preventing through-holes at the corners and improving sealing.

[0021] The application scope of this invention is not limited. It can be applied not only to common metallurgical furnaces such as side-blown furnaces, top-blown furnaces, and electric furnaces, but also to the corner parts of other types of rectangular furnaces.

[0022] like Figure 1 As shown, the length direction along the side wall cooling plate 1 is defined as the X direction, and the length direction along the end wall cooling plate 2 is defined as the Y direction. When the furnace body is subjected to thermal expansion force, if the side wall cooling plate 1 is displaced along the X direction or the end wall cooling plate 2 is displaced along the Y direction, the displacement amount is always within the contact surface range of the corner cooling plate 3. This effectively avoids the formation of through gaps at the corners, ensuring the integrity of the sealing structure. Furthermore, it significantly expands the cooling and heat exchange area, increases the heat flux, and accelerates the cooling and solidification of the melt.

[0023] When high-temperature molten material leaks from the brick joints, the rectangular kiln wall corner bidirectional sealing cooling device (hereinafter referred to as the cooling device) at the four corners of the kiln can quickly remove the heat of the molten material, causing the leaking high-temperature molten material to cool and solidify rapidly, forming a dense solidified layer, thereby blocking further penetration of the molten material, reducing the risk of molten material leaking from the four corners of the kiln, and ensuring the long-term safe and stable operation of the kiln.

[0024] It is understandable that if the corner cooling plate 3 is not installed, and only the overlapping side wall cooling plate 1 and end wall cooling plate 2 are installed, such as Figure 2 As shown, in actual operation, the refractory bricks in the furnace will undergo significant thermal expansion due to high temperatures, generating enormous expansion force. This force continuously acts on the cooling devices installed at the four corners of the furnace. Under this outward expansion force, the cooling devices will shift, forming through-type gaps, such as... Figure 3 As shown, this disrupts the overall sealing structure. Furthermore, once a gap forms, the cooling effect decreases significantly.

[0025] In some embodiments, such as Figure 1 As shown, the corner cooling plate 3 has a first extension section 31 extending along the length direction (i.e., the X direction) of the side wall cooling plate 1 and a second extension section 32 extending along the length direction (i.e., the Y direction) of the end wall cooling plate 2. The first extension section 31 and the second extension section 32 are perpendicular to each other, forming an L-shaped structure. The first contact surface is located on the second extension section 32, and the second contact surface is located on the first extension section 31.

[0026] By designing the corner cooling plate 3 into an L-shaped structure, it can accurately adapt to the bidirectional thermal expansion displacement requirements of the furnace body. This ensures that when the furnace body undergoes thermal displacement along the X and Y directions, the bidirectional sealing cooling device at the corner of the rectangular furnace wall in this embodiment of the invention always maintains a tight wrapping shape over the corner area of ​​the furnace, continuously achieving bidirectional sealing and effectively avoiding the generation of through gaps.

[0027] Furthermore, the length of the first extension section 31 can be less than, equal to or greater than the length of the second extension section 32, and the specific length is designed according to the actual furnace size.

[0028] Furthermore, when the length of the furnace sidewall is greater than the length of the furnace endwall, the length of the first extension section 31 is greater than the length of the second extension section 32; when the length of the furnace sidewall is less than the length of the furnace endwall, the length of the first extension section 31 is less than the length of the second extension section 32. The specific dimensions are designed based on the amount of thermal expansion.

[0029] In some embodiments, the height of the cooling plate is greater than or equal to the height of the molten pool inside the furnace, and the heights of the side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 are equal. This ensures the sealing and cooling effect at the four corners of the furnace body in the height direction.

[0030] It is understood that the furnace body mainly comprises a lower molten pool region and an upper gas phase region in the height direction. The height of the cooling plate can be equal to or unequal to the height of the furnace body, and can be flexibly adjusted according to project needs, but it must be at least higher than the molten pool region. This is because: the cooling device in this embodiment of the invention mainly prevents the melt in the molten pool region from leaking outwards, but it can also prevent the flue gas in the gas phase region from escaping outwards. When it is necessary to prevent the flue gas in the gas phase region from escaping outwards, the height of the cooling plate can be designed to be equal to the height of the furnace body. Since the escape of flue gas in the gas phase region usually does not cause major safety accidents, if it is desired to reduce investment costs, the height of the cooling plate can also be designed to be equal to the height of the molten pool region, and flexible sealing can be achieved at the corners of the gas phase region using materials such as fire clay or fiberboard.

[0031] In some embodiments, the side wall cooling plate 1, the end wall cooling plate 2, and the corner cooling plate 3 each have a cooling cavity inside, the cooling cavity is filled with a cooling medium, and the cooling cavity has a medium inlet and a medium outlet, which are respectively connected to flow control valves.

[0032] In some embodiments, the cooling medium may be water, inert gas, or mineral cooling oil, preferably water.

[0033] Furthermore, when the cooling medium is water, the medium inlet is the water inlet, which is connected to the water inlet pipe, and the medium outlet is the water outlet, which is connected to the water outlet pipe. Typically, the water inlet is located at the bottom of the cooling chamber, and the water outlet is located at the top of the cooling chamber. The water inlet pipe is connected to the water source, and the water outlet pipe is connected to the circulating water tank. The circulating water tank is connected to the water inlet pipe through the circulating water pipe, allowing the discharged high-temperature water to be cooled and reused.

[0034] Furthermore, the cooling medium can be selected from various forms such as softened water and deionized water, which can be adapted to the cooling needs of different smelting scenarios.

[0035] In some embodiments, the side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 are made of copper, steel, copper-steel composite materials, or other alloys.

[0036] Preferably, the side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 are made of copper. Copper has a high thermal conductivity, which allows for rapid heat transfer; moreover, copper has a high thermal conductivity and strong temperature uniformity, allowing heat to spread rapidly on the copper cooling plate, avoiding the formation of localized hot spots and making the temperature of the entire cooling plate more uniform.

[0037] Furthermore, depending on the actual working conditions, the side wall cooling plate 1, the end wall cooling plate 2, and the corner cooling plate 3 can be manufactured using different materials and processes, such as steel plate water jackets, cast copper water jackets, or rolled copper water jackets.

[0038] In some embodiments, the side wall cooling plate 1 is fixedly connected to the side wall of the furnace body by bolts, and the end wall cooling plate 2 is fixedly connected to the end wall of the furnace body by bolts.

[0039] In some embodiments, the side wall cooling plate 1 is inserted into the furnace body side wall and then fixedly connected by bolts, and the end wall cooling plate 2 is inserted into the furnace body end wall and then fixedly connected by bolts.

[0040] Understandably, the outer walls of the furnace sidewalls and endwalls can be vertical planes, inclined planes, or planes with protrusions or grooves (such as E-shaped surfaces, toothed surfaces, etc.). To ensure a tight fit between the sidewall cooling plate 1 and the outer wall of the furnace sidewall, and between the endwall cooling plate 2 and the outer wall of the furnace endwall, the contact surfaces of the sidewall cooling plate 1 and the endwall cooling plate 2 need to be designed to conform to the shapes of the outer walls of the furnace sidewall and the furnace endwall. When the outer walls of the furnace sidewall and the furnace endwall have protrusions or grooves, the sidewall cooling plate 1 needs to be inserted into the furnace sidewall before being bolted in place. Similarly, the endwall cooling plate 2 needs to be inserted into the furnace endwall before being bolted in place.

[0041] In some embodiments, the rectangular furnace wall corner bidirectional sealing cooling device further includes a temperature monitoring device to monitor the outer surface temperature of the side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 or the temperature of the cooling medium in real time. The temperature monitoring device is electrically connected to a temperature alarm. When the temperature monitoring device detects that the temperature exceeds the set value, the temperature alarm will sound an alarm.

[0042] By installing temperature monitoring devices, the working environment at the corners of the furnace can be accurately determined, leakage risks can be predicted, production operations can be arranged in advance, and the safe and stable operation of the furnace can be ensured.

[0043] Furthermore, the temperature monitoring device can be connected to the outer surface of the side wall cooling plate 1, the end wall cooling plate 2, or the corner cooling plate 3, or inside the cooling cavity, or at the medium inlet and medium outlet.

[0044] Furthermore, the temperature monitoring device is electrically connected to the flow control valve. When the temperature monitoring device detects that the temperature exceeds the set value, the flow control valve can automatically adjust the valve opening to regulate the flow.

[0045] In some embodiments, the corner cooling plate 3 is equipped with a displacement monitoring device to monitor the displacement of the side wall cooling plate 1 and the end wall cooling plate 2 relative to the corner cooling plate 3. This allows for a direct understanding of the displacement of the furnace side wall and furnace end wall relative to the corner cooling plate 3, and helps to predict potential leakage risks. The displacement monitoring device is electrically connected to a displacement alarm. When the displacement monitoring device detects a relative displacement or a relative displacement exceeding a set value, the displacement alarm sounds an alarm.

[0046] Furthermore, the displacement monitoring device can be a mechanical displacement monitoring device or an electronic displacement monitoring device.

[0047] The present invention will be further illustrated by specific embodiments below.

[0048] Example 1 In the pyrometallurgical process of processing laterite nickel ore, the typical RKEF (rotary kiln-electric furnace) process usually uses an electric arc furnace (electric furnace) for ferronickel smelting. In this embodiment, a rectangular electric furnace is selected, with the following key dimensions: furnace length 32m, furnace width 8.5m; during production, the slag discharge temperature is controlled at 1600–1650℃, and the ferronickel discharge temperature is controlled at 1500–1550℃. To adapt to the high-temperature smelting conditions, the furnace lining is constructed of magnesia bricks, which can effectively resist high-temperature erosion and scouring.

[0049] Because electric furnaces expand due to high temperatures during operation, and the expansion along the length of the furnace is 2 to 3 times that along the width, stress concentration and through-holes can easily occur at the four corners of the furnace, leading to the risk of molten metal leakage. Therefore, cooling devices according to this invention are installed at the four corners of the furnace.

[0050] like Figure 1 As shown, the cooling device includes a side wall cooling plate 1, an end wall cooling plate 2, and a corner cooling plate 3. The side wall cooling plate 1 is tightly fitted and fixedly connected to the outer wall of the furnace body's side wall, and the end wall cooling plate 2 is tightly fitted and fixedly connected to the outer wall of the furnace body's end wall. Both the side wall cooling plate 1 and the end wall cooling plate 2 are approximately 1.5m long. A 90° angled corner notch is formed between the end wall cooling plate 2 and the adjacent side wall cooling plate 1. The corner cooling plate 3 is located within the corner notch and is tightly fitted to the end faces of both the side wall cooling plate 1 and the end face of the end wall cooling plate 2. The side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 are all at the same height as the furnace body.

[0051] The corner cooling plate 3 has a first extension 31 and a second extension 32 that are perpendicular to each other, forming an L-shaped structure. The first extension 31 is arranged along the length direction of the side wall cooling plate 1, and the second extension 32 is arranged along the length direction of the end wall cooling plate 2. The length of the first extension 31 is approximately 350 mm, and the length of the second extension 32 is approximately 150 mm. The first extension 31 abuts against the end face of the furnace body end wall, and the second extension 32 abuts against the end face of the furnace body side wall. The first extension 31 has a second contact surface that abuts against the end wall cooling plate 2, and the length of the second contact surface is greater than the width of the end wall cooling plate 2. The second extension 32 has a first contact surface that abuts against the side wall cooling plate 1, and the length of the first contact surface is greater than the width of the side wall cooling plate 1. By setting up the cooling device of this embodiment, the bidirectional thermal expansion of the furnace body can be effectively compensated, and through gaps at the four corners of the furnace body can be avoided.

[0052] The side wall cooling plate 1, end wall cooling plate 2, and corner cooling plate 3 all adopt a cast copper water jacket structure. Copper has excellent thermal conductivity, which can quickly transfer heat and ensure cooling efficiency. Softened water is selected as the cooling medium. The temperature monitoring device monitors the inlet and outlet temperatures of the cooling water in real time. When the temperature difference between the inlet and outlet water exceeds 20°C, the temperature alarm issues a warning signal and automatically adjusts the flow control valve to increase the cooling water volume and cooling intensity, thus promptly curbing abnormal temperature rises, avoiding leakage risks at the source, and ensuring the continuous, stable, and safe operation of the electric furnace.

[0053] A displacement monitoring device is installed on the corner cooling plate 3 to monitor the displacement of the side wall cooling plate 1 and the end wall cooling plate 2 relative to the corner cooling plate 3. This allows for a direct understanding of the displacement of the furnace side walls and end walls relative to the corner cooling plate 3, and helps to predict potential leakage risks. The displacement monitoring device is electrically connected to a displacement alarm. When the displacement monitoring device detects relative displacement or when the relative displacement exceeds a set value, the displacement alarm issues a warning signal.

[0054] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or plate 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.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two plates or the interaction between two plates, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bidirectional sealing and cooling device for the corner of a rectangular furnace wall, characterized in that, Includes a cooling plate, the cooling plate comprising: Side wall cooling plate, which is tightly attached to the outer wall of the furnace body side wall at the corner of the furnace and is fixedly connected to the furnace body side wall; The end wall cooling plate is tightly fitted to the outer wall of the furnace body end wall at the corner of the furnace and is fixedly connected to the furnace body end wall. The end wall cooling plate and the adjacent side wall cooling plate form a corner notch with an included angle of 90°. A corner cooling plate is inserted into the corner notch and is in close contact with the end face of the side wall cooling plate and the end face of the end wall cooling plate, respectively. The corner cooling plate has a first contact surface that abuts against the side wall cooling plate and a second contact surface that abuts against the end wall cooling plate. The length of the first contact surface is greater than the width of the side wall cooling plate, and the length of the second contact surface is greater than the width of the end wall cooling plate.

2. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The corner cooling plate has a first extension section extending along the length direction of the side wall cooling plate and a second extension section extending along the length direction of the end wall cooling plate. The first extension section and the second extension section are perpendicular to each other, forming an L-shaped structure.

3. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The height of the cooling plate is greater than or equal to the height of the molten pool inside the furnace, and the heights of the side wall cooling plate, the end wall cooling plate, and the corner cooling plate are equal.

4. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The side wall cooling plate, the end wall cooling plate, and the corner cooling plate each have a cooling cavity inside. The cooling cavity is filled with a cooling medium and has a medium inlet and a medium outlet. The medium inlet and the medium outlet are respectively connected to flow control valves.

5. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 4, characterized in that, The cooling medium is water, inert gas, or mineral cooling oil.

6. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The side wall cooling plate, the end wall cooling plate, and the corner cooling plate are made of copper, steel, or copper-steel composite materials.

7. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The side wall cooling plate is fixedly connected to the side wall of the furnace body by bolts, and the end wall cooling plate is fixedly connected to the end wall of the furnace body by bolts.

8. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 7, characterized in that, The side wall cooling plate is inserted into the furnace body side wall and then fixedly connected by bolts. The end wall cooling plate is inserted into the furnace body end wall and then fixedly connected by bolts.

9. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, It also includes a temperature monitoring device to monitor the outer surface temperature or the temperature of the cooling medium of the side wall cooling plate, the end wall cooling plate, and the corner cooling plate, and the temperature monitoring device is electrically connected to a temperature alarm.

10. The bidirectional sealing and cooling device for the corner of a rectangular furnace wall according to claim 1, characterized in that, The corner cooling plate is equipped with a displacement monitoring device to monitor the displacement of the side wall cooling plate and the end wall cooling plate relative to the corner cooling plate. The displacement monitoring device is electrically connected to a displacement alarm.

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