Arc furnace cover structure

Abstract

This utility model discloses an electric arc furnace cover structure, which includes a cover body, a plurality of electrode holes on the top of the cover body, mounting components on the inner circumference of each electrode hole, a smoke exhaust component in the middle of the top of the cover body, a water inlet pipe on the top of the cover body, and a water outlet pipe at the bottom of the outer circumference of the cover body. This electric arc furnace cover structure allows for easy individual disassembly and assembly via modular bushings, avoiding the need to replace the entire cover in case of damage. A shape memory alloy ring, when heated and deformed during electric arc furnace operation, compresses and seals the electrode rods, preventing high-temperature flue gas leakage and avoiding excessive compression that could damage the electrode surface. The shape memory alloy ring returns to its original shape after cooling, facilitating electrode removal. Furthermore, a dust collection bag tied to one end of the smoke exhaust pipe effectively captures particulate matter and purifies the flue gas, facilitating compliance with emission standards and environmentally friendly production. Cooling water is supplied via a water pipe to cool the high-temperature flue gas, preventing damage to the ventilation equipment.

Description

Technical Field

[0001] This utility model relates to the field of electric arc furnace technology, specifically to an electric arc furnace cover structure. Background Technology

[0002] An electric arc furnace is an electric furnace that uses the high temperature generated by an electric arc on electrodes to melt ores and metals. When the gas discharge forms an electric arc, the energy is highly concentrated, and the arc temperature is above 3000℃. For melting metals, electric arc furnaces offer greater process flexibility than other steelmaking furnaces, can effectively remove impurities such as sulfur and phosphorus, have easy temperature control, and require less floor space, making them suitable for melting high-quality alloy steels.

[0003] The prior art patent document CN221840143U provides a furnace cover structure for an electric arc furnace, including a cover body and a moving assembly. The cover body has electrode holes located at the top of the cover body. The moving assembly includes a connecting seat, a turntable, a lifting part, a connecting rod, and a rotating part. In use, the connecting seat is fixed to the side wall of the electric arc furnace body. The rotating part drives the turntable to rotate, causing the cover body to rotate above the electric arc furnace. Then, the lifting part drives the cover body to move down to the upper surface of the electric arc furnace and fit against it, thus completing the installation of the cover body. When it is necessary to disassemble the cover body, the lifting part first drives the cover body to move up away from the electric arc furnace, and then the rotating part drives the turntable to rotate, causing the cover body to be misaligned with the electric arc furnace, thereby completing the disassembly of the electric arc furnace. This application facilitates the installation and disassembly of the cover body for maintenance of the inside of the electric arc furnace.

[0004] Although the existing technology has many beneficial effects, the following problems still exist: During the use of this device, the rigid clamping and threaded locking are easy to damage the electrode surface, and it is troublesome to loosen the screw on the high-temperature furnace cover when removing the electrode; secondly, during the use of this device, the high-temperature flue gas is directly discharged into the central hole, which is easy to pollute the environment due to unorganized dispersion and needs to be improved. In view of this, we propose an electric arc furnace cover structure. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0006] 1. Technical problems to be solved: To address the issues raised above, such as the potential damage to the electrode surface caused by rigid clamping and threaded locking, the inconvenience of loosening the screws on the high-temperature furnace cover when removing the electrode, and the environmental pollution caused by the direct, unorganized emission of high-temperature flue gas through the central hole, this utility model is proposed.

[0007] Therefore, the purpose of this utility model is to provide an electric arc furnace cover structure. The modular bushing facilitates disassembly and assembly, avoiding the need to replace the entire furnace cover when damaged. It also avoids damage to the electrode surface, prevents high-temperature flue gas leakage, makes electrode removal more convenient, facilitates the purification of flue gas, effectively captures particulate matter, achieves emission standards and environmentally friendly production, and facilitates cooling to avoid damage to the ventilation equipment.

[0008] 2. Technical Solution: To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: An electric arc furnace cover structure includes a cover body with multiple electrode holes at its top. Each electrode hole has an mounting assembly on its inner circumference. Each mounting assembly includes a bushing, mounting blocks on both sides of the bushing's outer circumference, an annular groove on the bushing's inner circumference, a shape memory alloy ring on the outer circumference of the annular groove, and a sealing ring on the inner circumference of the annular groove. Slots are formed on both sides of the top of each electrode hole's inner circumference, along with two receiving grooves and retaining grooves at both ends. A smoke exhaust assembly is located in the center of the top of the cover body, a water inlet pipe is located at the top of the cover body, and a water outlet pipe is located at the bottom of the outer circumference of the cover body. The sealing ring has a T-shaped cross-section to prevent the shape memory alloy ring from being compressed and causing the sealing ring to detach.

[0009] In a preferred embodiment of the electric arc furnace cover structure of this utility model, the exhaust assembly includes an exhaust pipe. The inner circumference of the exhaust pipe is lined with refractory bricks, the outer circumference of the exhaust pipe is lined with a water supply pipe, and the top outer circumference of the exhaust pipe is lined with an exhaust pipe. A dust collection bag is located at the other end of the outer circumference of the exhaust pipe, and a frame is provided on the inner circumference of the dust collection bag. The frame facilitates support of the dust collection bag and prevents the dust collection bag from shrinking and folding, thus affecting exhaust.

[0010] In a preferred embodiment of the electric arc furnace cover structure of this utility model, the bushing is made of chromium zirconium copper, the shape memory alloy ring is made of nickel-titanium alloy, and the sealing ring is made of ceramic fiber.

[0011] In a preferred embodiment of the electric arc furnace cover structure of this utility model, the inner diameter of the electrode hole matches the diameter of the bushing, and the size and position of the receiving groove match the size and position of the mounting block.

[0012] In a preferred embodiment of the electric arc furnace cover structure of this utility model, the refractory brick is made of chrome corundum brick, and the dust collection bag is made of polyimide.

[0013] In a preferred embodiment of the electric arc furnace cover structure of this utility model, the inner diameter of the exhaust pipe is larger than the diameter of the flue pipe, and a flange ring is provided at the other end of the outer circumference of the flue pipe.

[0014] As a preferred embodiment of the electric arc furnace cover structure of this utility model, the cooling water channel in the inner cavity of the cover body is a serpentine spiral flow channel, the cover body is arched, and the top of the cover body is provided with multiple hook cylinders.

[0015] 3. Beneficial effects: Compared with the prior art, the beneficial effects of this utility model are: This type of electric arc furnace cover structure uses modular bushings for easy individual disassembly and assembly, avoiding the need to replace the entire cover when damaged. The shape memory alloy ring deforms and compresses the sealing ring to seal the electrode rod during the operation of the electric arc furnace, preventing high-temperature flue gas leakage and avoiding excessive compression that could damage the electrode surface. The shape memory alloy ring returns to its original shape after the temperature drops, making it easy to remove the electrode. This type of electric arc furnace cover structure allows for effective capture of particulate matter and purification of flue gas via a dust collection bag tied to one end of the flue pipe, facilitating compliance with emission standards and environmentally friendly production. Cooling water is supplied through a water pipe to cool the high-temperature flue gas and prevent damage to the ventilation equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is a schematic diagram of the overall structure of an electric arc furnace cover according to the present invention; Figure 2 This is a schematic diagram of the furnace cover body structure of an electric arc furnace according to the present invention; Figure 3 This is a schematic diagram of the installation component structure of an electric arc furnace cover structure according to the present invention; Figure 4 This is a cross-sectional schematic diagram of the installation component structure of an electric arc furnace cover according to the present invention; Figure 5 This is a cross-sectional schematic diagram of the smoke exhaust component structure of an electric arc furnace cover according to this utility model.

[0017] The following are the labeling instructions in the diagram: 1. Furnace cover body; 2. Electrode hole; 3. Mounting assembly; 4. Smoke exhaust assembly; 5. Water inlet pipe; 6. Water outlet pipe; 7. Hook; 301. Bushing; 302. Mounting block; 303. Ring groove; 304. Shape memory alloy ring; 305. Sealing ring; 306. Slot; 307. Receiving groove; 308. Slot; 401. Smoke exhaust pipe; 402. Refractory brick; 403. Water supply pipe; 404. Exhaust pipe; 405. Dust collection bag; 406. Frame; 407. Flange ring. Detailed Implementation

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0019] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0020] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0023] This utility model provides an overall structural schematic diagram of one embodiment of an electric arc furnace cover structure, including: Please see Figures 1-5This embodiment of an electric arc furnace cover structure includes a cover body 1. Multiple electrode holes 2 are formed at the top of the cover body 1. Mounting components 3 are snapped onto the inner circumference of each electrode hole 2. Each mounting component 3 includes a bushing 301. Mounting blocks 302 are welded to both sides of the outer circumference of the bushing 301. The bushing 301 is designed to prevent damage to the electrode surface. An annular groove 303 is formed on the inner circumference of the bushing 301. A shape memory alloy ring 304 is welded to the outer circumference of the annular groove 303. A sealing ring 305 is threaded onto the inner circumference of the annular groove 303. The shape memory alloy ring 304 automatically deforms and compresses the sealing ring 305 as the temperature rises during electric arc furnace operation, causing the sealing ring 305 to press tightly against the electrode rod inserted inside the bushing 301, preventing flue gas from flowing through the gaps. To prevent pollution, slots 306 are provided on both sides of the top of the inner circumference of electrode hole 2. Slots 306 are for easy insertion of mounting block 302 into mounting bushing 301. Two receiving grooves 307 are provided on the inner circumference of electrode hole 2. Receiving grooves 307 are for easy rotation of bushing 301. Slots 308 are provided at both ends of the inner circumference of electrode hole 2. Slots 308 are for locking and cooperating with mounting block 302 to stably install bushing 301. A smoke exhaust component 4 is welded to the middle of the top of furnace cover body 1. A water inlet pipe 5 is welded to the top of furnace cover body 1. The water inlet pipe 5 is for inputting cooling water into the flow channel inside the furnace cover body 1 for cooling. A water outlet pipe 6 is welded to the bottom of the outer circumference of furnace cover body 1. The water outlet pipe 6 is for discharging the cooled water after heating.

[0024] It is worth noting that, in order to capture particulate matter and purify flue gas, the flue gas exhaust assembly 4 specifically includes an exhaust pipe 401. Refractory bricks 402 are snapped onto the inner circumference of the exhaust pipe 401. The refractory bricks 402 are designed to withstand the long-term impact and radiation of the 1200℃ high-temperature flue gas. A water supply pipe 403 is welded to the outer circumference of the exhaust pipe 401. The water supply pipe 403 is used to input cooling water to cool the high-temperature flue gas above 1000℃. If the temperature is too high, the cooling water will evaporate quickly and will not fall into the electric arc furnace and cause any impact. An exhaust pipe 404 is welded to the outer circumference of the top of the exhaust pipe 401. The exhaust pipe 404 is used to connect to external exhaust equipment to extract and discharge gas. A dust collection bag 405 is tied to the other end of the outer circumference of the exhaust pipe 401. The dust collection bag 405 is used to collect particulate matter in the flue gas. A frame 406 is snapped onto the inner circumference of the dust collection bag 405. The frame 406 is used to support the dust collection bag 405 and maintain its open shape to enhance its collection capacity.

[0025] Next, to adapt to the different temperatures at different locations during the operation of the electric arc furnace, specifically, the bushing 301 is made of chromium zirconium copper, the shape memory alloy ring 304 is made of nickel-titanium alloy, and the sealing ring 305 is made of ceramic fiber. The high thermal conductivity of the chromium zirconium copper bushing 301 rapidly transfers the heat of the electric arc to the water cooling system, thereby significantly reducing the operating temperature of the bushing 301 itself. The shape memory alloy ring 304 made of nickel-titanium alloy facilitates deformation at around 120°C. The outer circumference of the bushing 301 is close to the internal water cooling structure of the furnace cover body 1, which allows the shape memory alloy ring 304 to be heated to above 120°C during the operation of the electric arc furnace. The ceramic fiber material is for high-temperature resistance.

[0026] Meanwhile, to facilitate electrode installation, specifically, the inner diameter of electrode hole 2 matches the diameter of bushing 301, and the size and position of receiving groove 307 match the size and position of mounting block 302. By using electrode hole 2 whose inner diameter matches the diameter of bushing 301, it avoids excessively large inner diameter leading to flue gas leakage and excessively small inner diameter leading to electrode rod jamming. By using receiving groove 307 whose size and position match the mounting block 302, it facilitates more stable installation and avoids shaking.

[0027] Furthermore, to avoid damage caused by excessively high flue gas temperatures, specifically, the refractory brick 402 is made of chrome corundum brick, and the dust collection bag 405 is made of polyimide. Chrome corundum brick has extremely high refractoriness and can easily withstand flue gas at 1600℃, which facilitates the improvement of strength and hardness, enhances wear resistance and erosion resistance, and facilitates resistance to alkali metal oxides and dust erosion. The dust collection bag 405 made of polyimide material is suitable for long-term use in flue gas at 240℃.

[0028] It is worth noting that, in order to facilitate the extraction of the flue gas after dust removal by the external exhaust equipment, specifically, the inner diameter of the exhaust pipe 404 is larger than the diameter of the smoke exhaust pipe 401, and a flange ring 407 is welded to the other end of the outer circumference of the smoke exhaust pipe 401. The exhaust pipe 404, with an inner diameter larger than that of the smoke exhaust pipe 401, facilitates the provision of installation space for the dust collection bag 405, and the flange ring 407 facilitates the disassembly and assembly of the exhaust pipe 404 and the external exhaust equipment.

[0029] Finally, to facilitate the use of the electric arc furnace cover, specifically, the cooling water channel inside the furnace cover body 1 is a serpentine spiral flow channel, the furnace cover body 1 is arched, and multiple hooks 7 are welded to the top of the furnace cover body 1. The cooling water channel through the serpentine spiral flow channel facilitates the extension of the cooling water residence time and improves the cooling effect of the electric arc furnace cover. The hooks 7 facilitate the external hoisting equipment to move the furnace cover body 1 to the top of the electric arc furnace.

[0030] Combination Figures 1-5 The specific usage process of the electric arc furnace cover structure of this embodiment is as follows: 1. When this device is needed for use in the structure of an electric arc furnace cover, the electrode rod is inserted through the bushing 301. When the electric arc furnace is working, the temperature rises, causing the shape memory alloy ring 304 to automatically deform and squeeze the sealing ring 305. The sealing ring 305 presses the electrode rod inserted inside the bushing 301. At the same time, cooling water is introduced into the inner cavity of the furnace cover body 1 through the water inlet pipe 5 for cooling, and then discharged from the water outlet pipe 6. If damage occurs after long-term use, the electric arc furnace is stopped, the cooling water input speed is increased to cool the shape memory alloy ring 304 and restore its shape, the electrode rod is removed, and the external equipment lifts the bushing 301 to disengage the mounting block 302 from the slot 308 and rotates to pull out the bushing 301 from the slot 306 for replacement. 2: The high-temperature flue gas first enters the exhaust pipe 401. A cylindrical refractory brick 402 is clamped and installed on the inner wall of the exhaust pipe 401. Cooling water is introduced into the inner wall of the exhaust pipe 401 from the water supply pipe 403. The flue gas is rapidly cooled by evaporation and heat absorption. The cooled flue gas is extracted and discharged by the external air extraction equipment through the exhaust pipe 404 at the top. The flue gas enters the dust collection bag 405 tied to the end of the exhaust pipe 401. After long-term use, the external air extraction equipment is disassembled from the exhaust pipe 404 through the flange ring 407, and the dust collection bag 405 is removed and replaced.

[0031] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A furnace cover structure for an electric arc furnace, characterized in that, The furnace includes a furnace cover body (1), the top of which is provided with multiple electrode holes (2). Each electrode hole (2) has an inner circumferential mounting assembly (3). The mounting assembly (3) includes a bushing (301). The bushing (301) has mounting blocks (302) on both sides of its outer circumferential wall. The bushing (301) has an inner circumferential groove (303). The outer circumferential wall of the groove (303) has a shape memory alloy ring (304). A sealing ring (305) is provided on the inner wall of the circumference. Slots (306) are provided on both sides of the top of the inner wall of the electrode hole (2). Two receiving grooves (307) are provided on the inner wall of the circumference of the electrode hole (2). Slots (308) are provided at both ends of the inner wall of the circumference of the electrode hole (2). A smoke exhaust assembly (4) is provided in the middle of the top of the furnace cover body (1). A water inlet pipe (5) is provided on the top of the furnace cover body (1). A water outlet pipe (6) is provided at the bottom of the outer wall of the circumference of the furnace cover body (1).

2. The electric arc furnace cover structure according to claim 1, characterized in that, The smoke exhaust assembly (4) includes a smoke exhaust pipe (401), the inner circumference of the smoke exhaust pipe (401) is provided with refractory bricks (402), the outer circumference of the smoke exhaust pipe (401) is provided with a water supply pipe (403), the top outer circumference of the smoke exhaust pipe (401) is provided with an exhaust pipe (404), the other end of the outer circumference of the smoke exhaust pipe (401) is provided with a dust collection bag (405), and the inner circumference of the dust collection bag (405) is provided with a skeleton (406).

3. The electric arc furnace cover structure according to claim 2, characterized in that, The bushing (301) is made of chromium zirconium copper, the shape memory alloy ring (304) is made of nickel titanate, and the sealing ring (305) is made of ceramic fiber.

4. The electric arc furnace cover structure according to claim 3, characterized in that, The inner diameter of the electrode hole (2) matches the diameter of the bushing (301), and the size and position of the receiving groove (307) match the size and position of the mounting block (302).

5. The electric arc furnace cover structure according to claim 4, characterized in that, The refractory brick (402) is made of chrome corundum brick, and the dust collection bag (405) is made of polyimide.

6. The electric arc furnace cover structure according to claim 5, characterized in that, The inner diameter of the exhaust pipe (404) is larger than the diameter of the smoke exhaust pipe (401), and a flange ring (407) is provided at the other end of the outer circumference of the smoke exhaust pipe (401).

7. The electric arc furnace cover structure according to claim 6, characterized in that, The cooling water channel inside the furnace cover body (1) is a serpentine spiral flow channel. The furnace cover body (1) is arched. The top of the furnace cover body (1) is provided with multiple hooks (7).

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