Flue gas dedusting device

Abstract

The utility model discloses a flue gas dust removal device. The flue gas dust removal device according to the utility model comprises a gas flow pipe, a base part and a scraping part, a variable diameter section is formed in the gas flow pipe, the diameter of the variable diameter section gradually decreases in the direction away from the gas inlet of the gas flow pipe, the base part is movably arranged in the variable diameter section, the scraping part is arranged on the inner wall of the base part and / or the variable diameter section, and the scraping part is suitable for scraping the smoke dust on the inner wall of the variable diameter section and the at least partial outer surface of the base part. The flue gas dust removal device according to the utility model is provided with the scraping part on the inner wall of the base part and / or the variable diameter section, the self-cleaning of the flue gas dust removal device is realized through the scraping part, the cleaning effect is good, manual operation is not needed, and the efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of flue gas dust removal, and in particular to a flue gas dust removal device. Background Technology

[0002] Annular slotted venturi structures are widely used in flue gas dust removal systems. The Annular slotted venturi structure is usually equipped with a counterweight to regulate the gas flow rate. In actual application, dust easily adheres to the surface of the counterweight and the inner shell of the venturi. Therefore, the Annular slotted venturi structure needs to be cleaned regularly. However, the current cleaning method mainly relies on manual cleaning with a high-pressure water gun, which is complicated, time-consuming and labor-intensive. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this utility model is to provide a flue gas dust removal device. According to this utility model, a scraping component is provided on the inner wall of the base and / or the variable diameter section. The scraping component enables the flue gas dust removal device to self-clean, resulting in good cleaning effect, no need for manual operation, and high efficiency.

[0004] The flue gas dust removal device according to this utility model includes a gas flow pipe, a base portion, and a scraper. A variable diameter section is formed inside the gas flow pipe, and the diameter of the variable diameter section gradually decreases in the direction away from the gas inlet of the gas flow pipe. The base portion is movably disposed inside the variable diameter section. The scraper is disposed on the inner wall of the base portion and / or the variable diameter section, and the scraper is adapted to scrape off the dust from the inner wall of the variable diameter section and at least part of the outer surface of the base portion.

[0005] According to this utility model, the flue gas dust removal device has a base part in the variable diameter section. The base part can move in the variable diameter section. When the flue gas dust removal device is working, the effective flow area of ​​the gas in the variable diameter section can be changed by moving the position of the base part, thereby adjusting the gas flow rate. This allows the flue gas dust removal device to control the flow rate of the flue gas, so as to achieve the best smoke exhaust effect under various working conditions. When flue gas passes through the variable diameter section, dust adheres to the inner wall of the variable diameter section and the base. To address this, the flue gas dust removal system can be equipped with scraping components on both the base and the inner wall of the variable diameter section. As the base moves, the scraping components effectively remove dust from the inner wall of the variable diameter section and the outer surface of the base, achieving self-cleaning of the flue gas dust removal device. This prevents dust from accumulating over a long period and clogging the gas flow pipe. Furthermore, the scraping components allow the flue gas dust removal device to achieve self-cleaning through the movement of its own base, eliminating the need for complex operations of traditional cleaning methods (such as manual cleaning with high-pressure water guns). This achieves automatic dust removal inside the device, significantly improving dust removal efficiency and ease of cleaning, and helping to maintain the long-term stable and efficient operation of the flue gas dust removal device.

[0006] According to one embodiment of the present invention, the base portion moves axially along the variable diameter section and / or the base portion rotates about the axis of the variable diameter section.

[0007] According to one embodiment of the present invention, the base portion has a cleaning position, and the base portion is adapted to move along the axial direction of the variable diameter section to the cleaning position and then rotate about the axis of the variable diameter section; the scraper is adapted to contact the inner wall of the variable diameter section and / or at least a portion of the outer surface of the base portion when the base portion moves to the cleaning position.

[0008] According to one embodiment of the present invention, the flue gas dust removal device further includes: a driving device and a connecting rod, one end of the connecting rod being connected to the driving device and the other end of the connecting rod being connected to the base portion; wherein, the driving device is adapted to drive the base portion to move and / or rotate via the connecting rod.

[0009] According to one embodiment of the present invention, the scraping member includes: a first scraper and a second scraper, the first scraper being disposed on the base portion and protruding toward the inner wall of the variable diameter section, the first scraper being adapted to scrape off the dust on the inner wall of the variable diameter section when the base portion rotates in the cleaning position; the second scraper being disposed on the inner wall of the variable diameter section and protruding toward the base portion, the second scraper being adapted to scrape off the dust on the base portion when the base portion rotates in the cleaning position.

[0010] According to one embodiment of the present invention, a tapered surface corresponding to the inner wall of the variable diameter section is formed on the base portion, and the first scraper is disposed on the tapered surface.

[0011] According to one embodiment of the present invention, the first scraper is configured as a plurality of scrapers arranged around the outer periphery of the conical surface and spaced apart from each other, and a second scraper is arranged in two adjacent first scrapers.

[0012] According to one embodiment of the present invention, a plurality of first scrapers and a plurality of second scrapers are arranged at intervals in the circumferential direction, and the interval angle between two adjacent first scrapers is the same as the interval angle between two adjacent second scrapers.

[0013] According to one embodiment of the present invention, the number of the first scraper and the second scraper are both n, and satisfy: 3≤n≤6, where n is a positive integer.

[0014] According to one embodiment of the present invention, the scraping component is constructed of a wear-resistant and corrosion-resistant material.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a simplified structural diagram of a flue gas dust removal device according to an embodiment of the present invention; Figure 2 This is a simplified schematic diagram of the layout of the scraping component according to an embodiment of the present utility model.

[0017] Figure label: Flue gas dust removal device 1; Gas flow pipe 11, reducing section 111; 12-base portion and 121-conical surface; Scraping component 13, first scraper 131, second scraper 132; Drive unit 141, connecting rod 142. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] Annular slotted venturi structures are widely used in flue gas dust removal systems. The Annular slotted venturi structure is usually equipped with a counterweight to regulate the gas flow rate. In actual application, dust easily adheres to the surface of the counterweight and the inner shell of the venturi. Therefore, the Annular slotted venturi structure needs to be cleaned regularly. However, the current cleaning method mainly relies on manual cleaning with a high-pressure water gun, which is complicated, time-consuming and labor-intensive.

[0020] The following is for reference. Figures 1-2 This invention describes a flue gas dust removal device according to an embodiment of the present invention.

[0021] The flue gas dust removal device 1 according to the present invention includes a gas flow pipe 11, a base portion 12, and a scraper 13. A variable diameter section 111 is formed inside the gas flow pipe 11, and the diameter of the variable diameter section 111 gradually decreases in the direction away from the gas inlet of the gas flow pipe 11. The base portion 12 is movably disposed inside the variable diameter section 111. The scraper 13 is disposed on the inner wall of the base portion 12 and / or the variable diameter section 111, and the scraper 13 is adapted to scrape off the dust on the inner wall of the variable diameter section 111 and at least part of the outer surface of the base portion 12.

[0022] The flue gas dust removal device 1 of this utility model is equipped with a gas flow pipe 11, which can be simply understood as a Venturi structure in the prior art. A variable diameter section 111 is formed inside the gas flow pipe 11. The diameter of the variable diameter section 111 gradually decreases in the direction away from the gas inlet of the gas flow pipe 11. After the gas enters from the inlet, it flows along the variable diameter section 111. Since the diameter of the variable diameter section 111 gradually decreases in the direction of gas flow, the gas velocity will increase, thereby improving the efficiency of the entire flue gas dust removal system. A base part 12 is provided inside the variable diameter section 111. The base part 12 can move within the variable diameter section 111. When the flue gas dust removal device 1 is working, the effective flow area of ​​the gas in the variable diameter section 111 can be changed by moving the position of the base part 12, thereby adjusting the gas velocity. This allows the flue gas dust removal device 1 to control the flue gas velocity so as to achieve the best smoke exhaust effect under various working conditions. When flue gas passes through the variable diameter section 111, dust will adhere to the inner wall of the variable diameter section 111 and the base part 12. To address this, the flue gas dust removal system can be equipped with scraping elements 13 on the base part 12 and the inner wall of the variable diameter section 111. When the base part 12 moves, the scraping elements 13 can effectively scrape off the dust from the inner wall of the variable diameter section 111 and the outer surface of the base part 12, achieving self-cleaning of the flue gas dust removal device 1. This avoids the accumulation of dust over a long period of time, which can block the gas flow pipe 11. Moreover, the scraping elements 13 allow the flue gas dust removal device 1 to achieve self-cleaning through the movement of its own base part 12, eliminating the need for complex operations of traditional cleaning methods (such as manual cleaning with a high-pressure water gun). This achieves automatic dust removal inside the device, significantly improving dust removal efficiency and ease of cleaning, and helping to maintain the long-term stable and efficient operation of the flue gas dust removal device 1.

[0023] In some embodiments, the scraper 13 can be arranged reasonably according to actual needs. For example, the scraper 13 can be provided only on the inner wall of the diameter-changing section 111; the scraper 13 can be provided only on the base part 12; or the scraper 13 can be arranged in both positions, or even in other positions.

[0024] According to one embodiment of the present invention, the base portion 12 moves axially along the variable diameter section 111 and / or rotates around the axis of the variable diameter section 111. The base portion 12 can move axially along the variable diameter section 111 to change the gas flow area, adjust the gas flow rate within the variable diameter section 111, and thus adjust the exhaust dust removal efficiency of the flue gas dust removal device 1. Similarly, when the flue gas dust removal device 1 needs to be cleaned, the base portion 12 moves axially along the variable diameter section 111. At this time, the scraper 13 can be configured to surround the outer periphery of the base portion 12 or surround the inner wall of the variable diameter section 111. When the base portion 12 moves axially, the scraper 13 can effectively scrape off the dust on the base portion 12 and the inner wall of the variable diameter section 111, thereby achieving self-cleaning of the flue gas dust removal device 1. Furthermore, the base portion 12 can rotate around the axis of the variable diameter section 111. In this case, the scraping member 13 can be configured to extend axially along the variable diameter section 111 and be arranged on the outer periphery of the base portion 12 and / or the inner wall of the variable diameter section 111. The rotation of the base portion 12 causes the scraping member 13 to scrape away the dust on the inner wall of the variable diameter section 111 and the base portion 12, thereby achieving self-cleaning of the flue gas dust removal device 1. This flexible movement mode gives the flue gas dust removal device 1 stronger adaptability and flexibility. Under different operating conditions, such as changes in flue gas flow rate and dust concentration, the operating state of the device can be adjusted by controlling the movement mode of the base portion 12 to meet diverse flue gas treatment needs.

[0025] According to one embodiment of the present invention, the base portion 12 has a cleaning position. The base portion 12 is adapted to move along the axial direction of the variable diameter section 111 to the cleaning position and then rotate around the axis of the variable diameter section 111. The scraper 13 is adapted to contact the inner wall of the variable diameter section 111 and / or at least a portion of the outer surface of the base portion 12 when the base portion 12 moves to the cleaning position. The base portion 12 has a cleaning position within the variable diameter section 111. When the base portion 12 moves along the axial direction of the variable diameter section 111 to the cleaning position, the scraper 13 can contact the outer surface of the base portion 12 and / or the inner wall of the variable diameter section 111. At this time, the base portion 12 can rotate around the axis of the variable diameter section 111, and the scraper 13 can rotate relative to the base portion 12 or relative to the inner wall of the variable diameter section 111, thereby scraping off the adhering dust and achieving self-cleaning.

[0026] The cleaning position can be simply understood as the position of the base part 12 when it moves to the point where the scraper 13 contacts the outer surface of the base part 12 and / or the base part 12 contacts the inner wall of the variable diameter section 111.

[0027] The flue gas dust removal device 1 establishes a specific cleaning position for the base portion 12 and stipulates that the base portion 12 first moves axially along the variable diameter section 111 to that position before rotating around the axis. This creates an orderly operating procedure, allowing the scraper 13 to clean the inner wall of the variable diameter section 111 and the outer surface of the base portion 12 in the appropriate position and state. Compared to disordered or random movements, precise positioning to the cleaning position ensures that the scraper 13 contacts the dust-accumulated areas more effectively, thereby scraping away dust more thoroughly and greatly improving cleaning efficiency. Moreover, the scraper 13 only contacts the relevant surfaces for cleaning when the base portion 12 moves to the cleaning position, avoiding continuous friction between the scraper 13 and the base portion 12 and the inner wall of the variable diameter section 111 when unnecessary. This reduces wear on the scraper 13, the inner wall of the variable diameter section 111, and the outer surface of the base portion 12, thus extending the service life of the flue gas dust removal device 1, reducing the risk of malfunction, and improving the overall reliability of the flue gas dust removal device 1.

[0028] According to one embodiment of the present invention, the flue gas dust removal device 1 further includes: a driving device 141 and a connecting rod 142, one end of the connecting rod 142 being connected to the driving device 141, and the other end of the connecting rod 142 being connected to the base portion 12; wherein, the driving device 141 is adapted to drive the base portion 12 to move and / or rotate via the connecting rod 142. Figure 1 As shown, the flue gas dust removal device 1, by setting a drive device 141 and a connecting rod 142, and connecting the drive device 141 and the base part 12 with the connecting rod 142, can automatically drive the base part 12 to move in a predetermined manner (first move, then rotate) using the power generated by the drive device 141. This automates the dust removal process of the flue gas dust removal device 1, eliminating the need for manual operation of the base part 12, greatly improving the convenience and efficiency of operation, and reducing manual intervention and labor intensity. Moreover, the drive device 141 can precisely control parameters such as the movement speed, direction, and stroke of the base part 12. For example, it can precisely control the distance the base part 12 moves axially along the variable diameter section 111 to the cleaning position, as well as the angle and speed of rotation around the axis of the variable diameter section 111, ensuring the accuracy and stability of the dust removal process, allowing the scraper 13 to clean the accumulated dust in the optimal position and state, thus improving the dust removal effect.

[0029] According to one embodiment of the present invention, the scraping member 13 includes: a first scraper 131 and a second scraper 132. The first scraper 131 is disposed on the base portion 12 and protrudes toward the inner wall of the diameter-changing section 111. The first scraper 131 is adapted to scrape off the dust on the inner wall of the diameter-changing section 111 when the base portion 12 rotates in the cleaning position. The second scraper 132 is disposed on the inner wall of the diameter-changing section 111 and protrudes toward the base portion 12. The second scraper 132 is adapted to scrape off the dust on the base portion 12 when the base portion 12 rotates in the cleaning position.

[0030] like Figure 1 As shown, a first scraper 131 protruding toward the inner wall of the variable diameter section 111 is provided on the base part 12, and a second scraper 132 protruding toward the base part 12 is provided on the inner wall of the variable diameter section 111. When the base part 12 moves to the cleaning position, the first scraper 131 can contact the inner wall of the variable diameter section 111, and the second scraper 132 can contact the outer surface of the base part 12. At this time, the base part 12 rotates, the first scraper 131 rotates relative to the inner wall of the variable diameter section 111 and scrapes off the dust adhering to the inner wall of the variable diameter section 111, and the second scraper 132 rotates relative to the outer surface of the base part 12 and scrapes off the dust adhering to the outer surface of the base part 12, thereby realizing the self-cleaning of the entire flue gas dust removal device 1. The design of the first scraper 131 and the second scraper 132 working together internally and externally enables all-round cleaning of the inner wall of the variable diameter section 111 and the outer surface of the base 12, which greatly improves the thoroughness and efficiency of cleaning and ensures that the dust removal performance of the flue gas dust removal device 1 will not be affected by the accumulation of dust.

[0031] According to one embodiment of the present invention, a conical surface 121 corresponding to the inner wall of the variable diameter section 111 is formed on the base portion 12, and a first scraper 131 is provided on the conical surface 121. The conical surface 121 formed on the base portion 12 corresponds to the inner wall of the variable diameter section 111. The design of the conical surface 121 makes the shape of the base portion 12 and the inner wall of the variable diameter section 111 fit more closely. Based on this, the first scraper 131 can be provided to fit more closely to the inner wall of the variable diameter section 111 during the dust removal process, thereby more effectively scraping off the dust on the inner wall. In particular, for areas with different curvatures and angles that may exist on the inner wall of the variable diameter section 111, the design of the conical surface 121 enables the first scraper 131 to better perform its dust removal function, improving the adaptability and effectiveness of dust removal.

[0032] According to one embodiment of the present invention, a plurality of first scrapers 131 are configured to surround the outer periphery of the conical surface 121 and spaced apart from each other, and a second scraper 132 is disposed within two adjacent first scrapers 131. By configuring the first scrapers 131 to surround the outer periphery of the conical surface 121 and spaced apart from each other, the first scrapers 131 can cover a larger area of ​​the conical surface 121. During the rotation of the base portion 12, the inner wall of the variable diameter section 111 can be cleaned from multiple angles and positions, effectively reducing cleaning dead zones and ensuring that dust from all parts of the inner wall can be scraped off, greatly improving the comprehensiveness and thoroughness of the cleaning. A second scraper 132 is arranged within two adjacent first scrapers 131. This spaced and coordinated arrangement allows the first scrapers 131 and the second scrapers 132 to cooperate with each other during the dust removal process. When the base part 12 rotates, the first scrapers 131 and the second scrapers 132 scrape away the dust from the inner wall of the variable diameter section 111 and the outer surface of the base part 12, respectively, forming a continuous and efficient dust removal sequence. This avoids the inefficiency that may occur when using a single scraper for dust removal and significantly improves the overall dust removal efficiency.

[0033] However, it should be noted that since the first scraper 131 and the second scraper 132 are arranged in an alternating manner, the rotation angle of the base portion 12 needs to be reasonably designed according to the interval between the first scraper 131 and the second scraper 132 to avoid collision between the first scraper 131 and the second scraper 132 when the base portion 12 rotates. For example, when the base portion 12 moves to the cleaning position, the drive device 141 can control the base portion 12 to reciprocate within a designed angle through the connecting rod 142, so that the first scraper 131 and the second scraper 132 can better scrape off the dust in the corresponding position and improve the self-cleaning effect.

[0034] According to one embodiment of the present invention, a plurality of first scrapers 131 and a plurality of second scrapers 132 are arranged at intervals in the circumferential direction, and the interval angle between two adjacent first scrapers 131 is the same as the interval angle between two adjacent second scrapers 132. Because the first scrapers 131 and second scrapers 132 are evenly spaced, when the base portion 12 rotates, the contact between the scraper 13 and the inner wall of the variable diameter section 111 and the outer surface of the base portion 12 is more stable and orderly. This uniform arrangement reduces the problem of excessive local resistance caused by uneven scraper distribution, reduces the energy consumption of the flue gas dust removal device 1 during the self-cleaning process, improves energy utilization efficiency, and also reduces the impact of resistance fluctuations on the operational stability of the flue gas dust removal device 1. The uniform spacing ensures that the load borne by each scraper during the dust removal process is relatively balanced, avoiding premature damage to some scrapers due to excessive wear. At the same time, this uniform force distribution also reduces local impact and wear on the inner wall of the variable diameter section 111 and the outer surface of the base 12, extending the service life of the flue gas dust removal device 1 and reducing maintenance costs.

[0035] According to one embodiment of this utility model, the number of the first scraper 131 and the second scraper 132 is both n, and satisfies: 3≤n≤6, where n is a positive integer. Limiting the number of the first scraper 131 and the second scraper 132 to between 3 and 6 can effectively control the manufacturing cost of the scraping component 13 while ensuring the dust removal effect. If the number of scrapers is too small, it may not be able to fully cover the inner wall of the variable diameter section 111 and the outer surface of the base part 12, resulting in incomplete dust removal; while too many scrapers will increase the complexity and manufacturing cost of the scraping component 13, and may also affect the dust removal efficiency due to mutual interference between the scrapers.

[0036] In actual processing, n is preferably 3, such as Figure 2 As shown, there are three of each of the first scraper 131 and the second scraper 132. In this case, the interval between two adjacent first scrapers 131 is 120°, the interval between two adjacent second scrapers 132 is 120°, and the interval between two adjacent first scrapers 131 and second scrapers 132 is 60°. Figure 2 The arrow in the figure represents the direction of rotation of the base part 12.

[0037] According to one embodiment of this utility model, the scraper 13 is constructed of a wear-resistant and corrosion-resistant material. Flue gas typically contains various corrosive components, and the scraper 13 frequently rubs against the dust and components of the flue gas dust removal device 1 during the cleaning process. Constructing the scraper 13 of a wear-resistant and corrosion-resistant material effectively resists the corrosive effects of flue gas and the wear caused by friction, reducing the wear of the scraper 13 itself, thereby extending its service life and reducing the frequency of maintenance and replacement costs due to damage to the scraper 13. Similarly, the gas flow pipe 11 can also be made of a corrosion-resistant and wear-resistant material.

[0038] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are 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 this utility model.

[0039] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0040] In the description of this utility model, "multiple" means two or more.

[0041] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0042] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flue gas dust removal device, characterized in that, include: A gas flow pipe (11) has a variable diameter section (111) formed inside the gas flow pipe (11), the diameter of the variable diameter section (111) gradually decreases in the direction away from the gas inlet of the gas flow pipe (11); The base portion (12) is movably disposed within the variable diameter section (111); A scraper (13) is disposed on the inner wall of the base portion (12) and / or the variable diameter section (111), and the scraper (13) is adapted to scrape off dust from the inner wall of the variable diameter section (111) and at least part of the outer surface of the base portion (12).

2. The flue gas dust removal device according to claim 1, characterized in that, The base portion (12) moves axially along the variable diameter section (111) and / or the base portion (12) rotates about the axis of the variable diameter section (111).

3. The flue gas dust removal device according to claim 2, characterized in that, The base portion (12) has a cleaning position, and the base portion (12) is adapted to move to the cleaning position along the axial direction of the variable diameter section (111) and then rotate about the axis of the variable diameter section (111); the scraper (13) is adapted to contact the inner wall of the variable diameter section (111) and / or at least a portion of the outer surface of the base portion (12) when the base portion (12) moves to the cleaning position.

4. The flue gas dust removal device according to claim 3, characterized in that, Also includes: Drive unit (141). A connecting rod (142) is provided, one end of which is connected to the driving device (141), and the other end of which is connected to the base part (12); wherein The drive device (141) is adapted to drive the base part (12) to move and / or rotate via the connecting rod (142).

5. The flue gas dust removal device according to claim 4, characterized in that, The scraping element (13) includes: A first scraper (131) is disposed on the base portion (12) and protrudes toward the inner wall of the variable diameter section (111). The first scraper (131) is adapted to scrape off the dust from the inner wall of the variable diameter section (111) when the base portion (12) rotates in the cleaning position. The second scraper (132) is disposed on the inner wall of the variable diameter section (111) and protrudes toward the base part (12). The second scraper (132) is adapted to scrape off the dust from the base part (12) when the base part (12) rotates in the cleaning position.

6. The flue gas dust removal device according to claim 5, characterized in that, A tapered surface (121) corresponding to the inner wall of the variable diameter section (111) is formed on the base part (12), and the first scraper (131) is provided on the tapered surface (121).

7. The flue gas dust removal device according to claim 6, characterized in that, The first scraper (131) is constructed as a plurality of scrapers arranged around the outer periphery of the conical surface (121) and spaced apart from each other, and a second scraper (132) is arranged in two adjacent first scrapers (131).

8. The flue gas dust removal device according to claim 7, characterized in that, Multiple first scrapers (131) and multiple second scrapers (132) are arranged at intervals in the circumferential direction, and the interval angle between two adjacent first scrapers (131) is the same as the interval angle between two adjacent second scrapers (132).

9. The flue gas dust removal device according to claim 8, characterized in that, The number of the first scraper (131) and the second scraper (132) is n, and satisfies: 3≤n≤6, where n is a positive integer.

10. The flue gas dust removal device according to claim 1, characterized in that, The scraper (13) is made of a wear-resistant and corrosion-resistant material.

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