Dust removal device for continuous charging arc furnace

Abstract

The purpose of this invention is to provide a dust removal device for a continuously fed electric arc furnace, relating to the field of flue gas purification equipment technology. This device can adaptively adjust the scraping thickness to ensure that softened dust is thoroughly removed. A fixed ring is coaxially arranged with the filter cartridge, and a lifting drive mechanism is connected to the fixed ring via a connecting plate. Multiple arc-shaped scrapers are hinged to the fixed ring via hinge shafts, forming a dust removal structure around the outer circumference of the filter cartridge. A radial floating gap is left between adjacent arc-shaped scrapers. A water spray assembly is fixed relative to the fixed ring and located above the arc-shaped scrapers. Each arc-shaped scraper is equipped with at least one elastic element. Guide rollers are correspondingly arranged with the arc-shaped scrapers and located between the arc-shaped scrapers and the water spray assembly. Each arc-shaped scraper is fixed with an upwardly extending mounting rod, and the guide rollers are rotatably mounted on the mounting rods. The guide rollers can roll up and down along the dust layer around the outer circumference of the filter cartridge. The distance between the arc-shaped scraper and the filter cartridge axis is less than the distance between the guide roller and the filter cartridge axis.

Description

Technical Field

[0001] This invention relates to the technical field of flue gas purification equipment in the metallurgical industry, specifically to a dust removal device for a continuous feeding electric arc furnace. Background Technology

[0002] With increasingly stringent requirements for green and low-carbon production in the global steel industry, electric arc furnace (EAF) steelmaking has become the mainstream process for short-process steelmaking due to its advantages such as low energy consumption, low carbon emissions, and strong raw material adaptability. In particular, continuous feeding EAF technology significantly improves production efficiency by integrating scrap preheating, continuous conveying, and the smelting process. However, while the continuous feeding process brings high output, it also generates flue gas with complex composition, drastic temperature fluctuations (200℃-1200℃), and extremely high dust concentrations.

[0003] Currently, most mainstream electric arc furnace dust removal systems employ pulse-jet bag filters or cartridge filters. During long-term operation, the core filtration elements (filter bags or cartridges) gradually accumulate a layer of dust on their outer surface, forming a "dust layer" or "ash cake." This ash cake initially helps filter fine dust, but as its thickness increases, especially when the flue gas contains a high proportion of low-melting-point metal oxides such as FeO, CaO, and ZnO, it easily cakings under high temperature and chemical action.

[0004] The hardened dust layer has extremely poor air permeability, which will lead to: A surge in filter resistance: Fan energy consumption increases, and system pressure differential may spike from the normal 1000Pa to over 3000Pa.

[0005] Filter media clogging: Fine dust particles become embedded in the pores of the filter media, causing the filter cartridge to fail permanently and requiring expensive replacement.

[0006] Dust removal is difficult: Traditional pulse backflushing can only remove loose dust through airflow vibration, and is often helpless against hardened and compacted dust.

[0007] In the prior art, patent CN119075523B discloses a dust removal device for electric arc furnaces. This device uses nozzles to spray water onto the caked dust layer to soften it, and then a scraper is used to scrape away the softened dust. The scraper in this device uses a fixed-diameter, one-piece structure. In actual dust removal, the depth to which water penetrates the caked dust layer varies significantly due to factors such as water pressure, the degree of dust cakeing, and the uniformity of dust distribution. This results in varying thicknesses of softened dust in different areas.

[0008] A fixed-diameter scraper cannot adaptively adjust its scraping depth according to the softened thickness of the dust. It can only scrape away softened dust within a fixed thickness range, which can result in some water-penetrated and softened dust not being effectively removed. This residual water-soaked and softened dust will further clump together and clog the filter media pores, significantly reducing the air permeability of the dust layer, continuously increasing filtration resistance, leading to incomplete dust removal, decreased dust collection efficiency, and making it difficult to ensure the long-term stable operation of the dust collection equipment. Summary of the Invention

[0009] The purpose of this invention is to provide a dust removal device for a continuously feeding electric arc furnace that can adaptively adjust the scraping thickness and ensure that the water-soaked softened dust is completely scraped off, so as to solve the problem of poor air permeability and increased filtration resistance caused by incomplete dust removal.

[0010] The technical solution of the present invention is as follows: The dust removal device for a continuous feeding electric arc furnace includes: Filter cartridge; The fixing ring is coaxially arranged with the filter cartridge, and the fixing ring is connected to a lifting drive mechanism through a connecting plate; Multiple arc-shaped scrapers are respectively hinged to the fixed ring via hinge shafts. The multiple arc-shaped scrapers are spliced ​​together circumferentially to form a dust scraping structure around the outer periphery of the filter cartridge, and a radial floating gap is left between adjacent arc-shaped scrapers. The water spray assembly, fixed relative to the retaining ring and located above the arc-shaped scraper, is used to spray water onto the dust layer on the outer circumference of the filter cartridge; Each arc-shaped scraper is provided with at least one elastic element to provide an elastic force that causes the arc-shaped scraper to deflect about the hinge axis in the direction of the filter cartridge. The guide rollers are set one-to-one with the arc-shaped scrapers and are located between the arc-shaped scrapers and the water spray assembly. The arc-shaped scrapers are fixed with an upwardly extending mounting rod. The guide rollers are rotatably mounted on the mounting rods. The guide rollers can roll up and down along the dust layer on the outer periphery of the filter cartridge. The distance between the arc-shaped scraper and the axis of the filter cartridge is smaller than the distance between the guide rollers and the axis of the filter cartridge. During the dust removal operation, the guide rollers abut against the surface of the dust layer softened by water spraying, and the arc-shaped scraper moves radially according to the depth of water penetration and softening of the dust layer, so as to scrape off the softened dust at the corresponding depth.

[0011] The beneficial effects of this technical solution are as follows: When the dust removal device for a continuously fed electric arc furnace is in use, the device uses a filter cartridge as the core dust removal component. The filter cartridge is used to intercept dust from the dust-laden flue gas generated during the operation of the continuously fed electric arc furnace. Over time, dust adheres to the outer circumference of the filter cartridge, forming a caked dust layer. This leads to decreased air permeability and increased filtration resistance, requiring regular cleaning. The core logic of the cleaning process is as follows: first, water is sprayed onto the caked dust layer through a water spray assembly, using the moisture to penetrate and soften the caked dust. Then, an adaptively floating arc-shaped scraper thoroughly removes the softened dust, preventing residual water-soaked dust from affecting the air permeability of the filter cartridge.

[0012] The arc-shaped scraper is hinged to a fixed ring coaxial with the filter cartridge via a hinge shaft. An elastic element continuously provides a deflecting force to the arc-shaped scraper towards the filter cartridge, ensuring the scraper always maintains a tendency to conform to the outer circumference of the filter cartridge. A guide roller is mounted on an upward-extending mounting rod of the arc-shaped scraper, with the distance between the guide roller and the filter cartridge axis greater than the distance between the arc-shaped scraper and the filter cartridge axis. This ensures the arc-shaped scraper can remove a dust layer of appropriate thickness. The guide roller primarily functions as a "detection component" to sense changes in the dust layer thickness. A lifting drive mechanism, via a connecting plate, moves the fixed ring and the entire dust scraping and water spraying assembly up and down along the filter cartridge axis, achieving full-height dust layer coverage on the outer circumference of the filter cartridge.

[0013] After the dust layer is softened by water spray, the depth of water penetration varies in different areas due to differences in water spray pressure and degree of agglomeration, resulting in different thicknesses of softened dust. As the guide roller rolls along the dust layer, under the elastic force of the elastic element, it adaptively adjusts the distance between itself and the filter cartridge axis according to the thickness of the dust layer and the depth of softening caused by water penetration. This causes the arc-shaped scraper to float radially around the hinge axis. In areas with deep water penetration and thicker softened dust, the guide roller penetrates deeper into the dust layer due to pressure, the arc-shaped scraper deflects at a larger angle towards the filter cartridge, and a greater thickness of softened dust is scraped off. In areas with shallow water penetration and thinner softened dust, the guide roller penetrates less deeply into the dust layer due to pressure, the arc-shaped scraper deflects at a smaller angle, and a smaller thickness of dust layer is scraped off. Ultimately, all softened dust is thoroughly removed while avoiding hard scraping of the filter cartridge.

[0014] By employing multiple arc-shaped scrapers hinged to a fixed ring, along with elastic components and guide rollers, the dust removal device can adaptively adjust the radial scraping position based on the actual water penetration and softening depth of the dust layer around the filter cartridge after water spraying. The guide rollers roll along the dust layer, ensuring that the scraper always adheres to the softened dust layer for scraping. This avoids the residue of some water-soaked dust due to uneven water penetration depth, thus preventing the residual water-soaked dust from caking and clogging the filter cartridge, reducing air permeability, increasing filtration resistance, and ensuring thorough dust removal and long-term stable operation of the dust removal device.

[0015] Meanwhile, the multi-piece arc-shaped scraper splicing structure can achieve radial floating, which will not hard scrape the filter cartridge and protect the filter cartridge from damage.

[0016] Based on the above solution, further improvements are made as follows: the elastic element is a tension spring, with its upper end connected to the side of the arc-shaped scraper near the filter cartridge, and its lower end connected to the fixing ring. By limiting the elastic element to a tension spring, and specifying that its upper end connects to the arc-shaped scraper and its lower end to the fixing ring, the structure is simple and reliable to install. It can stably provide deflection force towards the filter cartridge, ensuring that the guide roller is always pressed against the dust layer surface, thus improving adaptive following accuracy. The tension spring arrangement provides reasonable stress distribution, reducing the likelihood of failure and improving the operational reliability and service life of the device.

[0017] Based on the above solution, further improvements are made as follows: the lower end of the arc-shaped scraper is hinged to the fixed ring only at the hinge shaft, while the remaining part has a gap between itself and the fixed ring to allow for radial deflection of the arc-shaped scraper. By limiting the arc-shaped scraper to only connect to the fixed ring at the hinge shaft, and leaving a radial deflection gap in the remaining part, the radial swing of the arc-shaped scraper under the action of the elastic element becomes more flexible and interference-free, enabling it to more sensitively follow changes in dust layer thickness for floating dust scraping; at the same time, it avoids friction and jamming between the scraper and the fixed ring, improving the smoothness of adaptive adjustment and the stability of the dust cleaning action.

[0018] Based on the above solution, further improvements are made as follows: the curved scraper has beveled sides on both circumferentially, and secondary blades are provided on the beveled sides. By providing secondary blades on the beveled sides of the curved scraper, while the main scraper body removes softened dust, residual dust in the gap area between adjacent scrapers can be removed, avoiding cleaning dead zones; the secondary blades can further improve the uniformity and thoroughness of cleaning, reducing localized clogging of the filter cartridge caused by residual dust.

[0019] Based on the above solution, further improvements are made as follows: there are six arc-shaped scrapers, all of which have the same shape and size. Using six arc-shaped scrapers of identical shape and size ensures uniform circumferential arrangement, balanced force distribution, and complete dust coverage, enabling comprehensive cleaning of the dust layer around the filter cartridge. The identical structure facilitates manufacturing, assembly, and replacement, reducing manufacturing costs, while ensuring consistent floating of each scraper and improving the overall cleaning effect. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the structural principle of the dust removal device for a continuously feeding electric arc furnace according to the present invention. Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a top view of the curved scraper. In the diagram: 1-Filter cartridge, 11-Dust layer, 2-Fixing ring, 3-Connecting plate, 4-Arc scraper, 41-Hinge shaft, 42-Radial floating gap, 5-Water spray assembly, 6-Tension spring, 7-Guide roller, 8-Mounting rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0024] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0025] A specific embodiment of the dust removal device for a continuously fed electric arc furnace according to the present invention: Adaptive dust removal implementation under standard operating conditions: The fixing ring 2 is coaxially arranged with the filter cartridge 1. The fixing ring 2 is connected to a lifting drive mechanism through the connecting plate 3. The arc-shaped scrapers 4 are respectively hinged to the fixing ring 2 through the hinge shaft 41. Multiple arc-shaped scrapers 4 are spliced ​​together circumferentially to form a dust scraping structure around the outer periphery of the filter cartridge 1. A radial floating gap is left between adjacent arc-shaped scrapers 4. The water spraying assembly 5 is fixed relative to the fixing ring 2 and located above the arc-shaped scrapers 4, and is used to spray water onto the dust layer 11 on the outer periphery of the filter cartridge 1. Each arc-shaped scraper 4 is provided with at least one elastic element to provide an elastic force that causes the arc-shaped scraper 4 to deflect around the hinge shaft 41 towards the filter cartridge 1. Guide rollers 7 and arc-shaped scrapers 4 are arranged in a one-to-one correspondence and located between the arc-shaped scrapers 4 and the water spray assembly 5. The arc-shaped scrapers 4 are fixed with upwardly extending mounting rods 8. The guide rollers 7 are rotatably mounted on the mounting rods 8. The guide rollers 7 can roll up and down along the dust layer 11 on the outer periphery of the filter cartridge 1. The distance between the arc-shaped scraper 4 and the axis of the filter cartridge 1 is less than the distance between the guide rollers 7 and the axis of the filter cartridge 1. During dust removal, the guide rollers 7 abut against the surface of the softened dust layer 11. The arc-shaped scrapers 4 adaptively float radially according to the water penetration and softening depth of the dust layer 11, scraping away the softened dust at the corresponding depth.

[0026] This embodiment describes in detail the application of the present invention in a typical continuous-feed electric arc furnace dust removal system. The system handles a flue gas volume of approximately 500,000 Nm³ / h, and the filter cartridge is a composite glass fiber filter cartridge with a diameter of 325 mm and a length of 6 m.

[0027] like Figure 1 and Figure 2 As shown, the device of the present invention includes a filter cylinder 1, a fixing ring 2, a connecting plate 3, an arc-shaped scraper 4, a water spray assembly 5, a tension spring 6, a guide roller 7, and a mounting rod 8.

[0028] The fixing ring 2 is made of 304 stainless steel, with an inner diameter slightly larger than the outer diameter of the filter cartridge, and is connected to the lifting drive mechanism (such as a hydraulic cylinder or servo electric cylinder) through the connecting plate 3.

[0029] The curved scraper 4 has a total of six blades (such as...) Figure 3 (As shown). The six scrapers are identical in shape and size, arranged in a regular hexagonal pattern. The central angle of each scraper is 55° (with a 5° gap). The scraper body is laser-cut from wear-resistant and high-temperature-resistant NM400 steel plate, and the cutting edge is hardened.

[0030] Hinged structure: The lower end of the arc-shaped scraper 4 is connected to the retaining ring 2 via a hinge shaft 41. Specifically, except for the pin hole position of the hinge shaft 41, there is sufficient floating clearance between the rest of the arc-shaped scraper 4 and the upper surface of the retaining ring 2. This design ensures that the scraper can freely swing radially around the hinge point as a fulcrum when subjected to an upward reaction force, without being jammed by the retaining ring.

[0031] Elastic reset mechanism: A tension spring 6 is selected as the elastic element. The upper end of the tension spring 6 is hooked onto a pre-set lug on the inner side of the arc-shaped scraper 4 (near the filter cartridge side), and the lower end is hooked onto the corresponding lug on the fixing ring 2. In the free state, the tension spring 6 is in a slightly stretched state, always providing a downward pulling force, forcing the outer side (mounting rod end) of the arc-shaped scraper 4 to tilt up, and the inner side (blade end) to be in close contact with the outer wall of the filter cartridge 1.

[0032] Assume that a 20mm thick slab of dust layer 11 has been formed on the outer surface of filter cartridge 1, and that the upper dust layer has a higher hardness than the lower layer due to its proximity to the flue gas inlet.

[0033] The lifting drive mechanism is activated, lowering the entire device to below the filter cartridge 1. The water spray assembly 5 (using high-pressure atomizing nozzles) begins operation, spraying atomized water onto the outer surface of the filter cartridge 1. The water quickly penetrates into the caked dust layer 11. Due to gravity and the difference in density of the upper dust, it is assumed that the water penetration depth in the upper part of the filter cartridge is approximately 5 mm, while the penetration depth in the relatively loose lower part can reach 15 mm.

[0034] After spraying for 3-5 seconds, the lifting drive mechanism begins to pull the fixed ring 2 upward at a constant speed (e.g., 0.5 m / min).

[0035] When the guide roller 7 rolls to the lower part of the filter cartridge, the dust layer 11 there is fully permeated by water and has a soft structure. Under the tension of the tension spring 6, the guide roller 7 sinks deeply into the soft mud. Since the radial position of the guide roller 7 is greater than that of the arc-shaped scraper 4, according to the lever principle, when the guide roller 7 sinks 10mm, the arc-shaped scraper 4 will deflect at a greater angle (about 15°) towards the filter cartridge 1 with the hinge shaft 41 as the fulcrum. At this time, the blade of the arc-shaped scraper 4 cuts deeply into the softened mud layer, completely removing the deep-seated water-soaked dust until a clean filter cartridge substrate is exposed.

[0036] When the device moves upward to the upper part of the filter cartridge, the surface is only moistened by moisture due to the hardened surface. The guide roller 7 contacts the hard dust layer and cannot sink down. At this time, the guide roller 7 is subjected to an upward reaction force, which is transmitted to the outer end of the arc-shaped scraper 4 through the mounting rod 8. This forces the arc-shaped scraper 4 to overcome the tension of the tension spring 6 and deflect slightly outward (away from the filter cartridge) around the hinge shaft 41. At this time, the blade of the arc-shaped scraper 4 only lightly scrapes the softened thin layer on the surface, without forcibly scraping the hard shell below, thus avoiding scratching the filter cartridge 1.

[0037] During the scraping process, a small amount of residue may remain due to the radial floating gap 42 between the six arc-shaped scrapers 4. However, because the two sides of the arc-shaped scrapers 4 are designed as bevels, and secondary cutting edges are machined on these bevels (such as... Figure 3As shown in the figure, when the scraper rotates downward with the fixed ring 2, the secondary blade will perform lateral cutting on the residual dust in the gap area to ensure that there are no dead corners for dust removal.

[0038] After one downward stroke, the lifting drive mechanism reverses, driving the device upward. During this process, water spraying stops, and the scraper returns to its original position under the action of tension spring 6, ready for the next downward scraping stroke. Usually, 2-3 reciprocating strokes are sufficient to thoroughly clean the entire surface of the filter cartridge.

[0039] Example 2: Implementation of anti-adhesion measures under high-viscosity dust conditions Under certain special smelting conditions (such as smelting galvanized automotive steel scrap), the flue gas contains a high concentration of zinc vapor, which condenses and forms a highly adhesive layer of zinc oxide dust on the surface of the filter cartridge. This dust not only clumps when it comes into contact with water, but also has a glue-like stickiness, making it very easy to adhere to ordinary scrapers, resulting in "scraping the scraper".

[0040] To address this operating condition, the device has been optimized in the following ways in this embodiment: Scraper surface treatment: The working surface of the arc-shaped scraper 4 is treated with Teflon (PTFE) spraying or hard chrome plating and polishing, which significantly reduces surface energy and prevents sticky dirt from adhering.

[0041] Water spray component optimization: Water spray component 5 not only sprays clean water, but can also spray a certain amount of alkaline cleaning agent droplets according to the program to neutralize the acidic colloids in the dust and further reduce stickiness.

[0042] Vibration assistance: A small pneumatic vibrator is added to the fixed ring 2. Whenever the device rises to the top, the vibrator starts for 0.5 seconds, using high-frequency micro-vibration to dislodge the stubborn mud adhering to the back of the scraper and let it fall into the ash hopper below.

[0043] Example 3: Low-temperature start-up implementation in extremely cold regions In winter in high-latitude regions of northern China, after dust removal equipment is shut down, residual moisture on the surface of the filter cartridge may freeze, causing the dust layer to freeze into an ice shell with extremely high hardness.

[0044] The response strategy in this embodiment is as follows: Preheating procedure: Before starting the dust removal system, first turn on the residual heat of the preheating section of the electric arc furnace and introduce low-temperature flue gas of about 200°C into the dust removal pipeline to preheat and dry the filter cartridge 1.

[0045] Low-pressure test: During the initial cut, the lifting drive mechanism uses a low-pressure mode. If the guide roller 7 encounters ice and cannot sink, and an abnormal increase in the drive motor current is detected (indicating a hard resistance), the system immediately stops descending and switches to a rotating idling heating mode, waiting for the ice to melt before scraping.

[0046] Material cold resistance: The elastic element is made of 65Mn spring steel and coated with antifreeze silicone grease to ensure that it will not break at -40℃.

[0047] Example 4: Emergency Protection Implementation for Filter Cartridge Damage During long-term operation, the filter cartridge may develop localized damage (holes) due to aging. If the scraper is used to forcibly scrape the hole, it may cause the hole to tear and enlarge.

[0048] The protection logic of this device is as follows: Thanks to its multi-lobed independent floating structure, when one of the arc-shaped scrapers 4 reaches the hole in the filter cartridge, the negative pressure of the airflow at that location will suddenly change, or the dust layer may be missing, causing the guide roller 7 to lose support momentarily. In this situation, the arc-shaped scraper 4 will instantly spring inward under the action of the tension spring 6, retracting its blade to avoid the hole area. Meanwhile, the other intact scrapers continue to operate normally. This "zoned independent response" characteristic greatly protects the structural integrity of the filter cartridge.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A dust removal device for a continuously feeding electric arc furnace, characterized in that, include: Filter cartridge; The fixing ring is coaxially arranged with the filter cartridge, and the fixing ring is connected to a lifting drive mechanism through a connecting plate; Multiple arc-shaped scrapers are respectively hinged to the fixed ring via hinge shafts. The multiple arc-shaped scrapers are spliced ​​together circumferentially to form a dust scraping structure around the outer periphery of the filter cartridge, and a radial floating gap is left between adjacent arc-shaped scrapers. The water spray assembly, fixed relative to the retaining ring and located above the arc-shaped scraper, is used to spray water onto the dust layer on the outer circumference of the filter cartridge; Each arc-shaped scraper is provided with at least one elastic element to provide an elastic force that causes the arc-shaped scraper to deflect about the hinge axis in the direction of the filter cartridge. The guide rollers are set one-to-one with the arc-shaped scrapers and are located between the arc-shaped scrapers and the water spray assembly. The arc-shaped scrapers are fixed with an upwardly extending mounting rod. The guide rollers are rotatably mounted on the mounting rods. The guide rollers can roll up and down along the dust layer on the outer periphery of the filter cartridge. The distance between the arc-shaped scraper and the axis of the filter cartridge is smaller than the distance between the guide rollers and the axis of the filter cartridge. During the dust removal operation, the guide rollers abut against the surface of the dust layer softened by water spraying, and the arc-shaped scraper moves radially according to the depth of water penetration and softening of the dust layer, so as to scrape off the softened dust at the corresponding depth.

2. The dust removal device for a continuous feeding electric arc furnace according to claim 1, characterized in that, The elastic element is a tension spring, with its upper end connected to the side of the arc-shaped scraper near the filter cylinder and its lower end connected to a retaining ring.

3. The dust removal device for a continuous feeding electric arc furnace according to claim 1, characterized in that, The lower end of the arc-shaped scraper is hinged to the fixed ring only at the hinge shaft, and the rest of the part has a gap between it and the fixed ring to allow the arc-shaped scraper to deflect radially.

4. The dust removal device for a continuous feeding electric arc furnace according to claim 1, characterized in that, The curved scraper has beveled sides on both sides along the circumference, and a secondary blade is provided on the beveled sides.

5. The dust removal device for a continuous feeding electric arc furnace according to claim 1, characterized in that, There are six curved scrapers, and all six curved scrapers are the same shape and size.

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