Electrode and furnace cover sealing structure of electric arc furnace

Abstract

This application discloses a sealing structure between the electrode and the furnace cover of a submerged arc furnace, relating to the field of smelting equipment technology. Its key technical features include: a lower mounting base, which is an annular structure with an inner diameter larger than the diameter of the electrode hole on the furnace cover; the lower mounting base is fixedly mounted on the upper side of the furnace cover and the two are coaxially arranged; an upper mounting base is parallel to the upper side of the lower mounting base and is fixedly mounted on the outside of the electrode module; a retractable sealing element is provided between the lower and upper mounting bases, which can adapt to changes in the distance between them in real time during relative movement; a heat insulation module is provided between the retractable sealing element and the electrode module. The retractable sealing element of this application can form a dynamically variable sealed space outside the electrode module, improving the sealing performance between the electrode and the furnace cover during the use of the submerged arc furnace.

Description

Technical Field

[0001] This application relates to the field of metallurgical equipment technology, and in particular to a sealing structure for an electrode and furnace cover of a submerged arc furnace. Background Technology

[0002] The electric arc furnace is a type of high-temperature furnace commonly used in the smelting industry. The electrode sealing device of the electric arc furnace is an important component of the furnace. It is installed on the furnace cover because the furnace cover has electrode holes for placing electrodes. There is inevitably a gap between the electrode and the furnace cover. The main function of the electric arc furnace electrode sealing device is to seal this gap, prevent the leakage of flue gas in the electric arc furnace, which would cause environmental pollution, and prevent air from entering the furnace, which could cause CO combustion, increase the furnace temperature, or even cause explosions and other safety accidents.

[0003] However, the electrodes of an electric arc furnace often need to be moved up and down during use because the portion of the electrode's working end embedded in the furnace charge must be strictly controlled within a certain parameter range. If the portion of the electrode inserted into the furnace charge is too long, it will lead to a decrease in resistance, electrode lifting, and a shift in the high-temperature zone. The surface of the furnace charge is prone to sintering into a hard shell, reducing permeability and causing slag overturning and sparking. If the portion of the electrode inserted into the furnace charge is too short, conductivity will be weakened, making it difficult to insert the electrode downwards, resulting in poor electrode firing, easy leakage of paste, or even breakage. In addition, during the operation of the electric arc furnace, the position of the electrodes needs to be adjusted in real time according to the furnace conditions.

[0004] Existing electric arc furnace sealing devices typically use pressure plates to fix high-temperature resistant materials to the furnace cover. The high-temperature resistant material (such as refractory fiber needle-punched felt) is responsible for sealing the gap between the electrode and the furnace cover. There is no substantial connection between the high-temperature resistant material and the electrode; they are simply tightly bonded together. During the up-and-down movement of the electrode, the refractory material is easily subject to uneven wear or deformation at the contact point with the electrode due to mutual friction. All of these factors reduce the sealing effect between the two, affecting the safe and stable operation of the electric arc furnace. Utility Model Content

[0005] This application provides a sealing structure between the electrode and the furnace cover of a submerged arc furnace, which can improve the sealing performance between the electrode and the furnace cover during the use of the submerged arc furnace.

[0006] The above-mentioned objective of this application is achieved through the following technical solution:

[0007] A sealing structure for an electrode and a furnace cover in a submerged arc furnace includes a lower mounting base. The lower mounting base is an annular structure, and its inner diameter is larger than the diameter of the electrode hole on the furnace cover. The lower mounting base is fixedly installed on the upper side of the furnace cover, and the two are coaxially arranged.

[0008] An upper mounting base is provided parallel to the upper side of the lower mounting base, and the upper mounting base is fixedly installed on the outside of the electrode module;

[0009] A retractable closure is provided between the lower mounting base and the upper mounting base. The retractable closure can adapt to the change in distance between the lower mounting base and the upper mounting base in real time when they move relative to each other.

[0010] A heat insulation module is provided between the retractable closure and the electrode module.

[0011] Furthermore, the retractable closure is a corrugated cylindrical sleeve structure; specifically, the material of the retractable closure is high-temperature resistant synthetic rubber.

[0012] Furthermore, each of the lower mounting base and the upper mounting base has a mounting groove on its adjacent side. The upper and lower ends of the retractable closure are respectively embedded in the mounting grooves of the upper mounting base and the lower mounting base. Each of the two mounting grooves has a pressure ring for fixing the retractable closure.

[0013] Furthermore, the heat insulation module includes a limiting block, which is integrally formed with the upper end of the lower mounting base near the electrode module. A first mounting bracket is fixedly installed on the side of the limiting block near the mounting groove, and there is a gap between the two. A first refractory material is arranged between the limiting block and the first mounting bracket, and the first refractory material is fixedly installed on the first mounting bracket.

[0014] A second mounting bracket is fixedly installed on the mounting groove of the upper mounting base near the electrode module. The second mounting bracket is coaxially located outside the first mounting bracket, and a portion of the second mounting bracket overlaps with a portion of the first mounting bracket. A second refractory material is fixedly installed on the side of the second mounting bracket near the first mounting bracket, and the side of the second refractory material away from the second mounting bracket is in contact with the first mounting bracket.

[0015] Furthermore, both the first refractory material and the second refractory material are refractory fiber felts.

[0016] Furthermore, a pressing component is provided on the upper and lower sides of the upper mounting base respectively;

[0017] The extrusion assembly includes two identical arc-shaped clamps. Each arc-shaped clamp has an ear plate at both ends of its open side. After the two arc-shaped clamps are fitted onto the outside of the electrode module, the ear plates between them are fixed together by bolts and nuts. Each of the two arc-shaped clamps has an enlarged base on its adjacent side.

[0018] Furthermore, the enlarged bases in both extrusion assemblies are in contact with the upper mounting base, and a high-temperature resistant sealing ring is provided between the end of the enlarged base near the electrode module and the corresponding side of the upper mounting base.

[0019] Furthermore, a pressure plate is fixedly installed on the upper and lower sides of the electrode hole, and a third refractory material is provided between the two pressure plates, and the third refractory material is located in the gap between the electrode module and the electrode hole.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This application incorporates a retractable sealing component with an adjustable height between the electrode module and the furnace cover. The upper and lower ends of the retractable sealing component are stably connected to the electrode module and furnace cover via upper and lower mounting bases, respectively. When the electrode module moves up and down, the retractable sealing component adapts to the changing relative positions between the electrode module and the furnace cover through its deformation. This ensures that the gap between the electrode module and the furnace cover remains isolated from the external environment, and the electrode module does not rub against the retractable sealing component during movement. This effectively improves the sealing effect of the electrode module during the use of the submerged arc furnace, preventing flue gas from escaping or excessive air from entering. Furthermore, this application includes a heat insulation module between the retractable sealing component and the electrode module, providing some protection for the flexible, high-temperature resistant module during use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 This is a cross-sectional view of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a single arc-shaped clamp in the extrusion assembly of this application.

[0026] Reference numerals: 1. Lower mounting base; 2. Furnace cover; 3. Electrode hole; 4. Upper mounting base; 5. Electrode module; 6. Telescopic closure; 7. Insulation module; 71. Limiting block; 72. First mounting bracket; 73. First refractory material; 74. Second mounting bracket; 75. Second refractory material; 8. Mounting groove; 9. Pressure ring; 10. Extrusion assembly; 101. Arc-shaped clamp; 102. Ear plate; 103. Enlarged base; 11. High-temperature resistant sealing ring; 12. Pressure plate; 13. Third refractory material. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0028] like Figure 1 and Figure 2 As shown, this application discloses a sealing structure for an electrode and a furnace cover of a submerged arc furnace, including a lower mounting base 1. The lower mounting base 1 is a circular ring structure. The inner diameter of the lower mounting base 1 is larger than the diameter of the electrode hole 3 on the furnace cover 2. The lower mounting base 1 is fixedly installed on the upper side of the furnace cover 2 and the two are coaxially arranged.

[0029] The upper mounting base 4 is provided parallel to the upper side of the lower mounting base 1, and the upper mounting base 4 is fixedly installed on the outside of the electrode module 5.

[0030] A retractable closure 6 is provided between the lower mounting base 1 and the upper mounting base 4. The retractable closure 6 can adapt to the change in distance between the lower mounting base 1 and the upper mounting base 4 in real time when they move relative to each other.

[0031] A heat insulation module 7 is provided between the retractable closure 6 and the electrode module 5.

[0032] In the above embodiments, the lower mounting base 1 of this application is fixedly mounted on the furnace cover 2 by bolts and nuts. The main purpose of the lower mounting base 1 having an inner diameter larger than the electrode hole 3 is to avoid contact with the electrode module 5. The electrode module 5 is not only the electrode itself, but also includes structures such as the holding system installed on it. This part belongs to the prior art, and this application has not improved it, so the specific details will not be elaborated here.

[0033] The upper mounting base 4 of this application is located above the lower mounting base 1 and is fixedly installed on the outer side of the portion of the electrode module 5 located above the furnace cover 2. A retractable closure 6 is provided between the upper mounting base 4 and the lower mounting base 1 and sleeved on the outer side of the electrode module 5.

[0034] After the two ends of the retractable sealing member 6 form a stable and tight connection with the upper mounting base 4 and the lower mounting base 1, the retractable sealing member 6, together with the lower mounting base 1 and the upper mounting base 4, can form a closed space above the gap between the electrode hole 3 and the electrode module 5. Since the retractable sealing member 6 of this application has the ability to expand and contract, that is, when the upper mounting base 4 moves up and down with the electrode module 5, the overall height of the retractable sealing member 6 will also change, so that the retractable sealing member 6 itself can adapt to the change of the relative position between the electrode module 5 and the furnace cover 2 in real time.

[0035] The connection between the two ends of the retractable closure 6 and the upper mounting base 4 and lower mounting base 1 remains unchanged throughout the process, thus maintaining the same sealing effect at their connection points. The change in the overall height of the retractable closure 6 stems from its telescopic capacity. Therefore, the space formed by the retractable closure 6, the lower mounting base 1, and the upper mounting base 4 consistently isolates the gap between the electrode module 5 and the electrode hole 3 from the external environment. Furthermore, the electrode module 5 does not rub against the retractable closure 6 during movement, effectively improving the sealing effect of the electrode module 5 during the use of the electric arc furnace, preventing flue gas from overflowing from the furnace or excessive air from entering. This application also includes a heat insulation module 7 between the retractable closure 6 and the electrode module 5, providing some protection for the flexible high-temperature resistant module during use.

[0036] Furthermore, such as Figure 1 and Figure 2 As shown, the retractable closure 6 is a corrugated cylindrical sleeve structure; the material of the retractable closure 6 is specifically high-temperature resistant synthetic rubber.

[0037] In the above embodiments, the corrugated cylindrical sleeve can not only adapt to changes in the relative position between the upper mounting base 4 and the lower mounting base 1 in real time, but also has a sufficiently large deformation range in the vertical direction. During deformation, the sidewalls will not easily collapse inwards, ensuring stable expansion and contraction. Although the temperature of the electrode outside the submerged arc furnace is far lower than that below the sintering zone inside the furnace, it can still reach several hundred degrees Celsius. For example, the temperature of the electrode at the top of the raw material in an ironmaking submerged arc furnace is approximately 300°C. If the expandable seal 6 of this application uses ordinary rubber material, although it will not directly contact the electrode module 5, the heat from the electrode module 5 may still affect its service life. Using high-temperature resistant synthetic rubber (such as phenyl silicone rubber, silicone rubber, and fluororubber) to manufacture the corrugated cylindrical expandable seal 6 of this application can effectively reduce the impact of high temperatures on the expandable seal 6.

[0038] Furthermore, such as Figure 2 As shown, both the lower mounting base 1 and the upper mounting base 4 have a mounting groove 8 on their adjacent sides. The upper and lower ends of the retractable closure 6 are respectively embedded in the mounting grooves 8 of the upper mounting base 4 and the lower mounting base 1. Each of the two mounting grooves 8 has a pressure ring 9 for fixing the retractable closure 6.

[0039] In the above embodiments, when installing the retractable closure 6, its upper and lower ends can be inserted into the mounting grooves 8 of the upper mounting base 4 and the lower mounting base 1, respectively. Then, a pressure ring 9 is placed in the upper mounting groove 8 and the lower mounting groove 8, respectively. After the pressure ring 9 presses the ends of the retractable closure 6 tightly, the pressure ring 9 and the upper mounting base 4 or the lower mounting base 1 are fixed together by bolts, nuts or adhesive. In this way, the two ends of the retractable closure 6 can always maintain a tight fit with the upper mounting base 4 and the lower mounting base 1 during use, so as to maintain the airtightness of the internal space of the retractable closure 6.

[0040] Furthermore, such as Figure 2 As shown, the heat insulation module 7 includes a limiting block 71, which is integrally formed with the upper end of the lower mounting base 1 near the electrode module 5. A first mounting bracket 72 is fixedly installed on the side of the limiting block 71 near the mounting groove 8, and there is a gap between the two. A first refractory material 73 is arranged between the limiting block 71 and the first mounting bracket 72, and the first refractory material 73 is fixedly installed on the first mounting bracket 72.

[0041] A second mounting bracket 74 is fixedly mounted on the mounting groove 8 on the upper mounting base 4 near the electrode module 5. The second mounting bracket 74 is coaxially disposed on the outside of the first mounting bracket 72, and a portion of the second mounting bracket 74 overlaps with a portion of the first mounting bracket 72. A second refractory material 75 is fixedly mounted on the side of the second mounting bracket 74 near the first mounting bracket 72, and the side of the second refractory material 75 away from the second mounting bracket 74 is in contact with the first mounting bracket 72.

[0042] In the above embodiments, a first refractory material 73 is provided along the circumference of the electrode module 5 between the limiting block 71 and the first mounting bracket 72 of this application, and a second refractory material 75 is installed below the upper mounting base 4 through the second mounting bracket 74. Furthermore, portions of the second refractory material 75 and the second mounting bracket 74 overlap with portions of the first refractory material 73 and the first mounting bracket 72. Thus, the first refractory material 73 and the second refractory material 75 can form a partition wall between the retractable closure 6 and the electrode module 5. The refractory material not only has the characteristic of stable use in high-temperature environments, but also has a certain heat insulation effect, which can, to a certain extent, improve the influence of the temperature on the electrode module 5 on the retractable closure 6. Simultaneously, the heat insulation module 7 can also play a limiting role inside the retractable closure 6, preventing the retractable closure 6 and the electrode module 5 from contacting each other.

[0043] Furthermore, both the first refractory material 73 and the second refractory material 75 are refractory fiber felts.

[0044] In the above embodiments, refractory fiber felt is a commonly used refractory material in smelting enterprises. This material is readily available, and its thermal conductivity is typically between 0.03 and 0.06 W / m·K, only 1 / 20 to 1 / 10 that of refractory clay bricks and 1 / 3 that of lightweight refractory bricks. This low thermal conductivity allows it to significantly reduce heat transfer in high-temperature environments, resulting in excellent insulation.

[0045] Furthermore, such as Figure 2 and Figure 3 As shown, a pressing component 10 is provided on the upper and lower sides of the upper mounting base 4 respectively;

[0046] The extrusion assembly 10 includes two identical arc-shaped clamps 101. Each of the two ends of the arc-shaped clamps 101 on the open side is provided with an ear plate 102. After the two arc-shaped clamps 101 are sleeved on the outside of the electrode module 5, the ear plates 102 between them are fixed together by bolts and nuts. An enlarged base 103 is provided on the side of the two arc-shaped clamps 101 that are close to each other.

[0047] In the above embodiments, both extrusion assemblies 10 of this application are fixedly mounted on the electrode module 5 by their respective arc-shaped clamps 101. After installation, the enlarged bases 103 of the two extrusion assemblies 10 are located on their mutually close sides, and the upper mounting seat 4 is located between the enlarged bases 103 of the two extrusion assemblies 10. In this way, the two extrusion assemblies 10 can fix the upper mounting seat 4 on the electrode module 5, achieving the effect of fixing the upper mounting seat 4 on the electrode module 5 at a specified position. Because the two arc-shaped clamps 101 in the extrusion assembly 10 are installed on the electrode module 5 by clamping action, this can avoid the extrusion assembly 10 installation process from affecting the structure of the electrode module 5 itself.

[0048] Furthermore, such as Figure 1 and Figure 2 As shown, the enlarged base 103 in both extrusion assemblies 10 is in contact with the upper mounting base 4, and a high-temperature resistant sealing ring 11 is provided between the end of the enlarged base 103 near the electrode module 5 and the corresponding side of the upper mounting base 4.

[0049] In the above embodiments, each of the enlarged bases 103 has a slot on the side facing the electrode module 5, and the upper mounting base 4 also has a similar slot on the corresponding position on the upper and lower sides. When the upper mounting base 4 is fixed by the extrusion assembly 10, a high-temperature resistant sealing ring 11 can be placed between the slot of the enlarged base 103 and the slot of the upper mounting base 4. In this way, after the upper mounting base 4 is installed by the extrusion assembly 10, the high-temperature resistant sealing ring 11 can seal the gap between the electrode module 5 and the upper mounting base 4 through extrusion deformation, thereby reducing the risk of air from the external environment entering the furnace through the gap between the electrode module 5 and the upper mounting base 4.

[0050] Furthermore, such as Figure 2 As shown, a pressure plate 12 is fixedly installed on the upper and lower sides of the electrode hole 3, and a third refractory material 13 is provided between the two pressure plates 12, and the third refractory material 13 is located in the gap between the electrode module 5 and the electrode hole 3.

[0051] In the above embodiments, the third refractory material 13 (the third refractory material 13 can also be refractory fiber felt) provided in the gap between the electrode module 5 and the electrode hole 3 can block the temperature inside the furnace and reduce the interference of the high temperature inside the furnace on the space composed of the retractable sealing part 6, the upper mounting seat 4 and the lower mounting seat 1 above the furnace cover 2.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A seal structure for a smelting furnace electrode and a furnace cover, characterized by: Includes a lower mounting base (1), which is a circular structure. The inner diameter of the lower mounting base (1) is larger than the diameter of the electrode hole (3) on the furnace cover (2). The lower mounting base (1) is fixedly installed on the upper side of the furnace cover (2) and the two are coaxially arranged. The lower mounting base (1) is provided with an upper mounting base (4) on its upper side, and the upper mounting base (4) is fixedly installed on the outside of the electrode module (5); A retractable closure (6) is provided between the lower mounting base (1) and the upper mounting base (4). The retractable closure (6) can adapt to the change in distance between the lower mounting base (1) and the upper mounting base (4) in real time when they move relative to each other. A heat insulation module (7) is provided between the retractable closure (6) and the electrode module (5).

2. The seal between the electrode and the roof of an arc furnace as claimed in claim 1, characterized in that: The retractable closure (6) is a corrugated cylindrical sleeve structure; the material of the retractable closure (6) is high-temperature resistant synthetic rubber.

3. The submerged-arc furnace electrode-to-lid seal structure of claim 2, wherein: The lower mounting base (1) and the upper mounting base (4) are each provided with a mounting groove (8) on their adjacent sides. The upper and lower ends of the retractable closure (6) are respectively embedded in the mounting grooves (8) of the upper mounting base (4) and the lower mounting base (1). Each of the two mounting grooves (8) is provided with a pressure ring (9) for fixing the retractable closure (6).

4. The submerged-arc furnace electrode-to-crown seal structure of claim 3, wherein: The heat insulation module (7) includes a limiting block (71), which is integrally formed with the upper end of the lower mounting base (1) near the electrode module (5). A first mounting bracket (72) is fixedly installed on the side of the limiting block (71) near the mounting groove (8) and there is a gap between the two. A first refractory material (73) is arranged between the limiting block (71) and the first mounting bracket (72), and the first refractory material (73) is fixedly installed on the first mounting bracket (72). A second mounting bracket (74) is fixedly mounted on the mounting groove (8) on the upper mounting base (4) near the electrode module (5). The second mounting bracket (74) is coaxially disposed on the outside of the first mounting bracket (72), and a portion of the second mounting bracket (74) overlaps with a portion of the first mounting bracket (72). A second refractory material (75) is fixedly mounted on the side of the second mounting bracket (74) near the first mounting bracket (72), and the side of the second refractory material (75) away from the second mounting bracket (74) is in contact with the first mounting bracket (72).

5. The submerged-arc furnace electrode-to-lid seal structure of claim 4, wherein: Both the first refractory material (73) and the second refractory material (75) are refractory fiber felt.

6. The submerged-arc furnace electrode-to-crown seal structure of claim 2, wherein: An extrusion assembly (10) is provided on the upper and lower sides of the upper mounting base (4). The extrusion assembly (10) includes two identical arc-shaped clamps (101). Each of the two ends of the arc-shaped clamps (101) on the open side is provided with an ear plate (102). After the two arc-shaped clamps (101) are sleeved on the outside of the electrode module (5), the ear plates (102) between them are fixed together by bolts and nuts. Each of the two arc-shaped clamps (101) on the side close to each other is provided with an enlarged base (103).

7. The submerged-arc furnace electrode-to-crown seal structure of claim 6, wherein: The enlarged base (103) in both extrusion assemblies (10) is in contact with the upper mounting base (4), and a high-temperature resistant sealing ring (11) is provided between the end of the enlarged base (103) near the electrode module (5) and the corresponding side of the upper mounting base (4).

8. The submerged-arc furnace electrode-to-crown seal structure of claim 1, wherein: A pressure plate (12) is fixedly installed on the upper and lower sides of the electrode hole (3). A third refractory material (13) is provided between the two pressure plates (12), and the third refractory material (13) is located in the gap between the electrode module (5) and the electrode hole (3).

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