A new type of gripper air curtain sealing structure of an electric arc furnace
By employing an air curtain sealing structure at the electrode position of the electric arc furnace and using a fan to deliver spiral airflow to prevent flue gas leakage, the problems of easy wear and smoke leakage of the sealing structure are solved, achieving a more stable sealing effect and a longer service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN JUNCHI METALLURGICAL COMPLETE EQUIP MFG CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-16
AI Technical Summary
The sealing structure at the electrode position of existing electric arc furnaces is prone to wear, has a short service life, poses a risk of smoke leakage, and requires frequent replacement, which affects production safety and efficiency.
An air curtain sealing structure is adopted. By forming a sealing gap between the holder and the electrode, airflow is introduced by the fan to form a spiral airflow, which prevents high-temperature flue gas from leaking. A spiral guide plate and a multi-fan design are used to enhance the sealing effect.
This achieves stable and reliable sealing of the electrode positions in the electric arc furnace, extends the service life of the sealing structure, reduces maintenance frequency and resource consumption, and improves production safety.
Smart Images
Figure CN224365311U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric arc furnace structure technology, specifically to a novel gas curtain sealing structure for the holder of an electric arc furnace. Background Technology
[0002] In the smelting process of an electric arc furnace, the lower electrode is continuously consumed. It needs to be continuously pressed downwards to compensate for the wear, maintain a reasonable distance between the electrode tip and the furnace charge, adapt to changes in the charge, and maintain the optimal arc length. Most existing semi-enclosed electric arc furnaces and all large industrial silicon electric arc furnaces use a sealing structure for their electrode holder systems, employing refractory bricks and refractory fiber felt, which is a hard contact seal. This has the following drawbacks:
[0003] 1. During the pressing and releasing process, the electrode will continuously rub against the seal, causing the seal to wear out. This results in a short service life for the seal, requiring frequent inspection and replacement, and thus a high maintenance frequency.
[0004] 2. As the gap between the seal and the electrode increases, smoke leakage occurs. When the amount of smoke leakage is large, the high-temperature smoke will damage the pipelines and equipment on the sealing device, posing a safety hazard and causing additional economic losses.
[0005] 3. Industrial silicon uses multi-section graphite electrodes screwed together to form an electrode column. These graphite electrodes may break near the sealing device. When replacing the electrode, the original sealing structure will fail, requiring the seals to be replaced and adjusted. This results in a large workload, a harsh operating environment, and significant impact on production due to furnace shutdowns for maintenance.
[0006] 4. It is necessary to keep spare refractory fiber felt on hand for replacement at any time, which will have a certain impact on warehousing funds, space and other resources.
[0007] It is evident that the sealing structure at the electrode location of current submerged arc furnaces still has room for improvement and should be optimized to enhance sealing performance and prevent excessive resource consumption during operation. Therefore, a more reasonable technical solution is needed to address the technical problems existing in the current technology. Utility Model Content
[0008] To overcome at least one of the aforementioned defects, this utility model proposes a novel gas curtain sealing structure for the holder of a submerged arc furnace. The aim is to ensure the airtightness of the gap between the holder and the electrode by generating a gas curtain structure for sealing, thereby preventing the leakage of high-temperature flue gas from the furnace to the outside, making the sealing structure stable and reliable, and effectively improving its service life.
[0009] To achieve the above objectives, the gripper air curtain sealing structure disclosed in this utility model can adopt the following technical solution:
[0010] A novel gas curtain sealing structure for a submerged arc furnace includes an electrode, a holding cylinder sleeved on the outside of the electrode, and a sealing gap formed between the holding cylinder and the electrode. A fan is provided on the outer wall of the holding cylinder, and the air outlet of the fan is connected to the sealing gap and used to send airflow into the sealing gap. The air outlet of the fan sends airflow tangentially into the sealing gap so that the airflow forms a spiral airflow flowing along the sealing gap. The spiral airflow flows toward the interior of the submerged arc furnace to prevent gas from leaking out of the submerged arc furnace.
[0011] The aforementioned holder air curtain sealing structure forms a sealing gap by cooperating with the electrode. A fan delivers sufficient airflow into the sealing gap to form an air curtain, thus forming an air curtain sealing structure that prevents high-temperature flue gas from escaping outward from the sealing gap. This non-contact sealing structure not only ensures the stability and reliability of the sealing structure at the holder of the electric arc furnace electrode, but also extends the effective life of the sealing structure.
[0012] Furthermore, to ensure the airflow travels in a predetermined direction within the sealed gap and forms a stable air curtain seal, the structure within the sealed gap is adjusted. Here, optimization is proposed, and one feasible option is: a spiral guide plate is installed within the sealed gap, with the inner side of the spiral guide plate facing the electrode surface and the outer side of the spiral guide plate conforming to the inner wall of the holding cylinder, thus forming a spiral guide channel within the sealed gap. When using the above scheme, the contact surface between the spiral guide plate and the electrode is smooth, and the connection between the spiral guide plate and the holding cylinder can be fixed by welding.
[0013] Furthermore, when guiding airflow, the spiral guide plate can be constructed in various forms, and its structure is not limited to a single one. Here, we optimize and propose one feasible option: the spiral guide plate forms an inclined guiding surface, with an obtuse angle between the guiding surface and the holding cylinder and an acute angle between the guiding surface and the electrode. When adopting the above scheme, the guiding surface can be a flat surface or a curved surface, with the aim of providing a better guiding effect.
[0014] Furthermore, when the blower delivers airflow into the holding cylinder, the higher the airflow velocity, the better the sealing effect of the formed air curtain. The blower can be configured in various ways; here, we optimize and propose one feasible option: Several blowers are spaced apart on the outer wall of the holding cylinder. The blower outlets connect to a spiral guide channel and deliver airflow into the spiral guide channel. The airflow flows along the spiral guide channel and into the electric arc furnace. Using this scheme, two blowers can be used, positioned one after the other along the airflow path to enhance the airflow along that path.
[0015] Furthermore, the outlet angle of the fan affects the effectiveness of the airflow in forming an air curtain. To enhance the sealing of the air curtain, an optimization is proposed, and one feasible option is suggested: the outlet diameter of the fan is smaller than the height of the spiral guide channel, and the wall of the outlet is tangent to the outer wall of the holding cylinder. With this solution, the fan outlet can be a straight channel, and the airflow forms a smooth vortex after entering the spiral guide channel.
[0016] Furthermore, the air outlet structure of the fan directly affects the delivered airflow. Here, optimization is proposed, and one feasible option is suggested: the fan's outlet end forms a conical air outlet channel, and the outlet is connected to the end port of the air outlet channel. With this scheme, the front end of the conical air outlet channel is connected to the fan, and the diameter of its end port is smaller than the diameter of the front end.
[0017] Furthermore, when setting up the fan, it can be connected to the outside of the holding cylinder in various ways, and its structure is not limited to one specific method. Here, we optimize and propose one feasible option: the outer wall of the holding cylinder is provided with a bracket, and the fan cooperates with the bracket. When adopting the above solution, each fan can be provided with a separate bracket, or a single bracket can be set up to support multiple fans.
[0018] Furthermore, besides directly mounting the fan onto the bracket, other connection methods can be used. Here, we optimize and propose one feasible option: the bracket is equipped with a mounting plate, and the fan is fixed to the mounting plate. In this solution, the mounting plate is connected and fixed to the bracket using fasteners, and the fan is connected to the mounting plate using fasteners.
[0019] Compared with the prior art, some of the beneficial effects of the technical solution disclosed in this utility model include:
[0020] By setting an air curtain sealing structure between the holding cylinder and the electrode, the airflow entering the sealing gap is guided by the air curtain sealing structure to form a spiral airflow and to form a positive pressure airflow. This creates pressure on the high-temperature flue gas in the electric arc furnace to prevent it from escaping from the sealing gap. This non-contact sealing structure is not only more stable and reliable, but also provides a more stable sealing effect and a longer effective service life. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the overall assembly of the holding cylinder and the electrode.
[0023] Figure 2 This is a schematic diagram of the interior of the holding cylinder after it is engaged with the electrode.
[0024] Figure 3 This is a schematic diagram of the internal structure after the holding cylinder is rotated 90° and engaged with the electrode.
[0025] Figure 4 This is a schematic diagram of the overall structure of the spiral guide plate.
[0026] Figure 5 This is a schematic cross-sectional view of section AA.
[0027] In the above attached figures, the meanings of each label are as follows:
[0028] 1. Electrode; 2. Holding cylinder; 3. Sealing gap; 4. Fan; 401. Air outlet channel; 402. Air outlet; 5. Mounting plate; 6. Spiral guide plate; 7. Bracket. Detailed Implementation
[0029] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this embodiment.
[0030] In view of the fact that the sealing structure of the existing electric arc furnace is easily damaged in high-temperature environment, resulting in poor sealing effect and leakage of high-temperature flue gas, the following embodiments are optimized and overcome the defects of the existing technology.
[0031] Example
[0032] like Figures 1-4 As shown, this embodiment provides a novel gas curtain sealing structure for a holder of a submerged arc furnace, including an electrode 1, a holder cylinder 2 sleeved on the outside of the electrode 1, and a sealing gap 3 formed between the holder cylinder 2 and the electrode 1; a fan 4 is provided on the outer wall of the holder cylinder 2, and the air outlet 402 of the fan 4 is connected to the sealing gap 3 and used to send airflow into the sealing gap 3. The air outlet 402 of the fan 4 sends airflow tangentially into the sealing gap 3 so that the airflow forms a spiral airflow flowing along the sealing gap 3. The spiral airflow flows toward the interior of the submerged arc furnace to prevent gas inside the submerged arc furnace from leaking outward.
[0033] The holder air curtain sealing structure disclosed in this embodiment forms a sealing gap 3 by cooperating with the holder and the electrode 1. The fan 4 delivers sufficient airflow into the sealing gap 3 to form an air curtain, thus forming an air curtain sealing structure that prevents high-temperature flue gas from escaping outward from the sealing gap. This non-contact sealing structure not only ensures the stability and reliability of the sealing structure at the holder of the electric arc furnace electrode 1, but also extends the effective life of the sealing structure.
[0034] To ensure that the airflow travels in a predetermined direction within the sealing gap 3, forming a stable air curtain seal, the structure within the sealing gap 3 is adjusted. This embodiment optimizes the design and adopts one feasible option: a spiral guide plate 6 is provided within the sealing gap 3, with the inner side of the spiral guide plate 6 facing the surface of the electrode 1, and the outer side of the spiral guide plate 6 adhering to the inner wall surface of the holding cylinder 2, thus forming a spiral guide channel within the sealing gap 3. When using the above scheme, the contact surface between the spiral guide plate 6 and the electrode 1 is smooth, and the connection between the spiral guide plate 6 and the holding cylinder 2 can be fixed by welding.
[0035] When guiding airflow, the spiral guide plate 6 can be constructed in various forms, and its structure is not limited to a single one. This embodiment optimizes and adopts one feasible option: the spiral guide plate 6 forms an inclined guiding surface, with an obtuse angle between the guiding surface and the holding cylinder 2 and an acute angle between the guiding surface and the electrode 1. When adopting the above scheme, the guiding surface can be a flat surface or a curved surface, with the aim of providing a better guiding effect.
[0036] When the blower 4 delivers airflow into the holding cylinder 2, the higher the airflow velocity, the better the sealing effect of the formed air curtain. The blower 4 can be arranged in various ways; this embodiment optimizes and adopts one feasible option: several blowers 4 are spaced apart on the outer wall of the holding cylinder 2. The air outlet 402 of the blower 4 connects to the spiral guide channel and sends airflow into the spiral guide channel. The airflow flows along the spiral guide channel and into the electric arc furnace. Using the above scheme, two blowers 4 can be set up and positioned one after the other along the airflow path to strengthen the airflow along the path.
[0037] When the fan 4 discharges air, its outlet angle affects the effectiveness of the airflow in forming an air curtain. To enhance the sealing of the air curtain, this embodiment optimizes the process by employing one feasible option: the diameter of the outlet 402 of the fan 4 is smaller than the height of the spiral guide channel, and the wall of the outlet 402 is tangent to the outer wall of the holding cylinder 2. With this design, the outlet 402 of the fan 4 can be a straight channel for airflow, allowing the airflow to form a smooth vortex after entering the spiral guide channel.
[0038] The air outlet structure of the fan 4 directly affects the delivered airflow. This embodiment optimizes the design and adopts one feasible option: the air outlet end of the fan 4 forms a conical air outlet channel 401, and the air outlet 402 is connected to the end port of the air outlet channel 401. With this design, the front end of the conical air outlet channel is connected to the fan 4, and the diameter of its end port is smaller than the diameter of the front end.
[0039] When setting up the fan 4, it can be connected to the outside of the holding cylinder 2 in various ways, and its structure is not limited to one specific method. This embodiment optimizes and adopts one feasible option: the outer wall of the holding cylinder 2 is provided with a bracket 7, and the fan 4 cooperates with the bracket 7. When adopting the above solution, a separate bracket 7 can be set for each fan 4, or a single bracket 7 can be set up to install and support multiple fans 4.
[0040] Besides directly mounting the fan 4 onto the bracket 7, other connection methods can also be used. This embodiment optimizes and adopts one feasible option: the bracket 7 is provided with a mounting plate 5, and the fan 4 is fixed to the mounting plate 5. In this scheme, the mounting plate 5 is connected and fixed to the bracket 7 by fasteners, and the fan 4 is connected to the mounting plate 5 by fasteners.
[0041] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments under the guidance of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be defined in the claims.
Claims
1. A novel gas curtain sealing structure for the holder of a submerged arc furnace, characterized in that: The device includes an electrode (1), a holding cylinder (2) is sleeved on the outside of the electrode (1), and a sealing gap (3) is formed between the holding cylinder (2) and the electrode (1); a fan (4) is provided on the outer wall of the holding cylinder (2), and the air outlet (402) of the fan (4) is connected to the sealing gap (3) and used to send airflow into the sealing gap (3). The air outlet (402) of the fan (4) sends airflow along the tangential direction of the sealing gap (3) so that the airflow forms a spiral airflow flowing along the sealing gap (3). The spiral airflow flows toward the interior of the electric arc furnace to prevent the gas inside the electric arc furnace from leaking outward.
2. The novel gas curtain sealing structure for the holder of the submerged arc furnace according to claim 1, characterized in that: A spiral guide plate (6) is provided inside the sealing gap (3). The inner side of the spiral guide plate (6) faces the surface of the electrode (1), and the outer side of the spiral guide plate (6) is attached to the inner wall of the holding cylinder (2), so that the sealing gap (3) forms a spiral guide channel.
3. The novel gas curtain sealing structure for the holder of the submerged arc furnace according to claim 2, characterized in that: The spiral guide plate (6) forms an inclined guide surface, which forms an obtuse angle with the holding cylinder (2) and an acute angle with the electrode (1).
4. The novel holder gas curtain sealing structure for a submerged arc furnace according to claim 2 or 3, characterized in that: The number of fans (4) is several, and they are spaced apart on the outer wall of the holding cylinder (2). The air outlet (402) of the fan (4) is connected to the spiral guide channel and sends airflow into the spiral guide channel. The airflow flows along the spiral guide channel and flows into the electric arc furnace.
5. The novel gas curtain sealing structure for the holder of the submerged arc furnace according to claim 4, characterized in that: The diameter of the air outlet (402) of the fan (4) is smaller than the height of the spiral guide channel, and the pipe wall of the air outlet (402) is tangent to the outer wall of the holding cylinder (2).
6. The novel gas curtain sealing structure for the holder of the submerged arc furnace according to claim 1, characterized in that: The air outlet of the fan (4) forms a conical air outlet channel (401), and the air outlet (402) is connected to the port at the end of the air outlet channel (401).
7. The novel gas curtain sealing structure for the holder of the submerged arc furnace according to claim 1, characterized in that: The outer wall of the holding cylinder (2) is provided with a bracket (7), and the fan (4) cooperates with the bracket (7).
8. The novel holder gas curtain sealing structure for a submerged arc furnace according to claim 7, characterized in that: The bracket (7) is provided with a mounting plate (5), and the fan (4) is fixed on the mounting plate (5).