Flue gas dedusting device for thermal power plant

Abstract

The application relates to the field of flue gas dust removal, and provides a flue gas dust removal device for thermal power plants, which comprises a bag dust removal assembly, a bag turning assembly and a cleaning assembly. The bag dust removal assembly comprises a dust removal chamber, a bag and a support framework, the bag and the support framework are arranged in the dust removal chamber, the support framework is used for supporting the bag, and the bottom of the bag is connected with the support framework. The bag turning assembly is used for turning the bag to enable the bag to be sleeved outside the cleaning assembly. The cleaning assembly is used for cleaning the bag. The application solves the problem of poor effect of the conventional bag dredging mode.

Description

Technical Field

[0001] This application relates to the field of flue gas dust removal, and more particularly to a flue gas dust removal device for thermal power plants. Background Technology

[0002] With rapid industrial development, thermal power generation plays a vital role in energy supply. Thermal power plants generate large amounts of flue gas during power generation, which contains various pollutants, especially particulate matter. Direct emission into the atmosphere would cause serious environmental pollution and harm human health. Therefore, effective dust removal from thermal power plant flue gas has become a crucial step in ensuring environmental quality and human health. At the same time, efficient flue gas dust removal technology also helps improve the service life and operating efficiency of power plant equipment, reducing equipment failures and maintenance costs caused by dust accumulation, which is of great significance to the sustainable development of the entire power industry.

[0003] Among existing flue gas dust removal technologies in thermal power plants, traditional baghouse dust collectors are widely favored due to their relatively low cost. Baghouse dust collectors work by passing dust-laden flue gas through filter bags; the dust is trapped on the bag surface, while clean gas is discharged through the bags. This method offers good dust removal efficiency and effectively removes fine dust particles. However, after a period of use, a large amount of dust accumulates on the surface of the filter bags, causing blockages and affecting the dust removal efficiency and normal operation of the equipment. To address the cleaning issue of the filter bags, some manufacturers currently use a method of tapping the bags to unclog them.

[0004] However, cloth bags rely on a support frame to keep them upright during use. This support frame can interfere with the process of tapping the bag, causing interference and reducing the bag's vibration, thus decreasing its effectiveness. Removing the bag from the support frame, cleaning it, and then reattaching it is cumbersome, and the bag, now without support, is difficult to tap with a conventional bag-tapping device. Manual cleaning is not only labor-intensive but can also be harmful to the user.

[0005] Based on the above problems, some manufacturers use blowing air instead of patting to unclog the cloth bag. However, the effective coverage of the airflow is limited, the cleaning efficiency and effect are limited, and the cloth bag will deform to a certain extent under the action of airflow, which will change the distance between the cloth bag and the air outlet. The attenuation of airflow will also affect the unclogging effect. Summary of the Invention

[0006] To address the problem of poor performance of traditional baghouse dust removal methods, this application provides a flue gas dust removal device for thermal power plants.

[0007] The technical solution of the flue gas dust removal device for thermal power plants provided in this application is as follows: A flue gas dust removal device for thermal power plants, comprising: A bag filter assembly includes a dust collection chamber, a filter bag, and a support frame. The filter bag and the support frame are both disposed in the dust collection chamber. The support frame is used to support the filter bag, and the bottom of the filter bag is connected to the support frame. A bag-turning assembly is used to turn the bag inside out so that the bag is fitted over the outside of the cleaning assembly; A cleaning component for cleaning the cloth bag.

[0008] By adopting the above technical solutions, the support frame can support the filter bag, keep the filter bag in shape, and facilitate dust removal from flue gas; the bag flipping component can flip the filter bag over and put it on the outside of the cleaning component, making it convenient for the cleaning component to clean the filter bag, improving the cleaning effect and service life of the filter bag, thereby ensuring the dust removal efficiency of the flue gas dust removal device in thermal power plants.

[0009] Optionally, the bag filter assembly further includes a partition plate, which is slidably connected to the inner wall of the dust collection chamber and divides the dust collection chamber into an upper chamber and a lower chamber. The partition plate is provided with perforations. The bag opening of the filter bag is connected to the partition plate and aligned with the perforations one by one. The perforations are used for the flue gas and the support frame to pass through. The cleaning component is at least partially disposed within the upper cavity and located above the supporting frame; The bag-flipping assembly is connected to the partition and is used to drive the partition to rise and fall so that the cloth bag switches between a first state and a second state; In the first state, both the cloth bag and the support frame are located in the upper cavity, the cloth bag is sleeved on the support frame and the opening of the cloth bag faces the lower cavity; In the second state, both the cloth bag and the support frame are located in the lower chamber, the cloth bag is sleeved on the outside of the cleaning component and the opening of the cloth bag faces the upper chamber; The cleaning component is used to clean the cloth bag in the second state.

[0010] By adopting the above technical solution, the partition divides the dust removal chamber into an upper chamber and a lower chamber. The bag opening is connected to the partition and aligned with the perforation to facilitate the passage of flue gas and the support frame, and to guide the flue gas flow in an orderly manner. The bag flipping assembly drives the partition to rise and fall, allowing the bag to switch between a first state and a second state. In the first state, the bag is placed on the support frame for normal dust removal. In the second state, the bag is placed outside the cleaning assembly, which facilitates the cleaning assembly to clean the bag, improving the cleaning effect and service life of the bag, and ensuring the continuous and effective operation of the dust removal device.

[0011] Optionally, the cleaning assembly includes a bag-tapping unit and an air-blowing unit; the bag-tapping unit is used to tap the cloth bag; and the air-blowing unit is used to blow air onto the cloth bag.

[0012] By adopting the above technical solution, setting up a bag-beating unit to beat the cloth bag and an air-blowing unit to blow air onto the cloth bag, the cloth bag can be cleaned from both mechanical beating and airflow impact. This can more effectively remove the dust attached to the cloth bag, improve the cleaning effect of the cloth bag, and ensure the dust removal efficiency and service life of the flue gas dust removal device in thermal power plants.

[0013] Optionally, the bag-beating unit includes a drive module, a first pipe, a bag-beating head, a connecting rod, and a spring; The first pipe is rotatably connected to the dust removal chamber; the drive module is connected to the first pipe and is used to drive the first pipe to rotate. One end of the connecting rod is inserted into the first pipe, and the connecting rod is slidably connected to the first pipe; a limiting part is provided at the end of the connecting rod inside the first pipe; the spring is located inside the first pipe and sleeved on the connecting rod; the opposite ends of the spring abut against the inner wall of the first pipe and the limiting part, respectively; the end of the connecting rod outside the first pipe is connected to the bag head.

[0014] By adopting the above technical solution, the drive module drives the first pipe to rotate, which in turn drives the bag-beating head to rotate and beat the cloth bag, thereby cleaning the cloth bag by beating it; the connecting rod is slidably connected to the first pipe and cooperates with the limiting part through a spring, so that the bag-beating head can adaptively adjust its position according to the condition of the cloth bag during the beating process, ensuring the beating effect.

[0015] Optionally, the bag-beating head is provided with a rotating module, the rotating module including a rotating cylinder and a rotating shaft, the rotating cylinder being sleeved on the rotating shaft and rotatably connected to the bag-beating head through the rotating shaft; the rotating cylinder is configured to contact the cloth bag and rotate around the rotating shaft.

[0016] By adopting the above technical solution, a rotating module is set in the bag-patting head, and the rotating cylinder is sleeved on the rotating shaft and can rotate around the rotating shaft, so that the rotating cylinder can rotate flexibly when it comes into contact with the cloth bag, reducing wear on the cloth bag.

[0017] Optionally, the number of rotating modules on the bag head is two sets; The rotating shaft is offset from the center of the corresponding rotating cylinder, and the two rotating cylinders are configured such that when the distal point of one rotating cylinder contacts the cloth bag, the proximal point of the other rotating cylinder contacts the cloth bag.

[0018] By adopting the above technical solution, two sets of rotating modules are set on the bag-beating head, with the rotating shaft offset from the center of the rotating cylinder. The two rotating cylinders alternately contact the cloth bag, which can beat the cloth bag more comprehensively and efficiently, enhance the cleaning effect on the cloth bag, and improve the overall cleaning efficiency and performance of the dust removal device.

[0019] Optionally, the two shafts are connected by a transmission module, which includes a chain and two gears. The two gears are fitted onto the two shafts in a one-to-one correspondence, and the two gears are connected by the chain drive.

[0020] By adopting the above technical solution, a transmission module consisting of a chain and two gears is used to connect two rotating shafts, realizing synchronous transmission of the two rotating shafts and ensuring that the two rotating drums can work in coordination. When the distal point of one rotating drum contacts the cloth bag, the proximal point of the other rotating drum contacts the cloth bag, making the beating and cleaning operation of the cloth bag more stable and efficient.

[0021] Optionally, the bag head is provided with an air blowing hole, and the inside of the connecting rod is provided with an air supply channel for connecting the air blowing hole and the inside of the first pipe; One end of the first pipe is closed, and the other end is connected to the air blowing unit.

[0022] By adopting the above technical solution, the bag-beating head is provided with an air blowing hole, and the connecting rod has an air supply channel inside that connects the air blowing hole and the inside of the first pipe. One end of the first pipe is closed and the other end is connected to the air blowing unit, which can realize the beating and air blowing cleaning of the cloth bag. Moreover, the gas of the air blowing unit can be blown out from the air blowing hole through the air supply channel, which enhances the cleaning effect on the cloth bag.

[0023] Optionally, the air inlet is located between the two rotating drums.

[0024] By adopting the above technical solution, when the two rotating drums come into contact with the cloth bag, they can open the corresponding parts of the cloth bag. On this basis, by setting the air blowing hole between the two rotating drums, the air blowing can be better applied to the cloth bag, thereby improving the cleaning effect on the cloth bag.

[0025] Optionally, the bag head is provided with a V-shaped groove, and the air blowing hole is located in the V-shaped groove.

[0026] By adopting the above technical solution, the bag head is provided with a V-shaped groove and the air blowing hole is located in the V-shaped groove, which can ensure that the air blowing hole always maintains a suitable distance from the cloth bag. The V-shaped groove will not cause the airflow to be too dispersed, so that the blown gas acts more concentratedly on the cloth bag, enhancing the cleaning effect and removing dust from the cloth bag more effectively.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. The bag-flipping assembly drives the partition to rise and fall, allowing the filter bag to switch between a first state and a second state. In the first state, the filter bag is placed on the support frame for normal dust removal. In the second state, the filter bag is placed on the outside of the cleaning assembly, avoiding interference from the support frame. The bag opening and bottom are fixed to the partition and support frame respectively, maintaining the basic shape of the filter bag and facilitating cleaning by the cleaning assembly. This improves the cleaning effect and service life of the filter bag, ensuring the continuous and effective operation of the dust removal device. 2. By setting a drive module to drive the first pipe and the bag-beating head to rotate, the bag-beating head can move under the action of centrifugal force to adapt to different sizes of cloth bags, and can also produce different beating effects on the cloth bags. The two rotating drums can beat the cloth bags alternately, thereby improving the cleaning effect. 3. The air blowing hole is located in the V-shaped groove on the bag head and between the two rotating cylinders, which can greatly improve the air blowing and unblocking effect. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the flue gas dust removal device for thermal power plants provided in this application; Figure 2 This is a partial structural schematic diagram of the flue gas dust removal device for thermal power plants when the filter bag is in the first state, as provided in this application. Figure 3 This is a partial structural schematic diagram of the flue gas dust removal device for thermal power plants when the filter bag is in the second state, as provided in this application. Figure 4 This is a partial top view of the bag-beating unit provided in this application; Figure 5 This application provides Figure 4 Enlarged diagram of point A in the middle.

[0029] Explanation of reference numerals in the attached figures: 1. Electrostatic dust removal components; 2. Baghouse dust collector assembly; 21. Dust collection chamber; 211. Upper chamber; 212. Lower chamber; 213. Air inlet; 214. Air outlet; 215. Dust hopper; 22. Partition plate; 221. Perforation; 23. Filter bag; 24. Support frame; 3. Bag-turning assembly; 4. Cleaning components; 41. Bag-tapping unit; 411. Drive module; 412. First pipe; 413. Bag-tapping head; 4131. Protrusion; 4132. V-groove; 4133. Air blowing hole; 414. Connecting rod; 4141. Limiting part; 415. Spring; 416. Rotating module; 4161. Rotating drum; 4162. Rotating shaft; 417. Transmission module; 4171. Chain; 4172. Gear; 42. Air blowing unit; 421. Rotary joint. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 5 This application will be described in further detail.

[0031] like Figures 1 to 3 As shown in the figure, this application discloses a flue gas dust removal device for thermal power plants, including an electrostatic dust removal component 1, a bag filter component 2, a bag turning component 3, and a cleaning component 4.

[0032] The bag filter assembly 2 includes a dust collection chamber 21, a partition 22, filter bags 23, and a support frame 24. The partition 22 is slidably connected to the inner wall of the dust collection chamber 21, dividing the interior of the dust collection chamber 21 into an upper chamber 211 and a lower chamber 212. The lower chamber 212 has an air inlet 213, and the upper chamber 211 has an air outlet 214. The electrostatic precipitator assembly 1 is connected to the air inlet 213. During dust collection, flue gas is drawn into the electrostatic precipitator assembly 1 by a fan. After electrostatic precipitation, the flue gas enters the lower chamber 212 from the air inlet 213 for further dust collection using the filter bags 23. The electrostatic precipitator assembly 1 is existing technology.

[0033] like Figures 2 to 3 As shown, both the filter bag 23 and the support frame 24 are located within the dust collection chamber 21. The support frame 24 supports the filter bag 23, and the bottom of the filter bag 23 (here, "bottom" refers to the bottom of the filter bag 23, a part name relative to the bag opening, not the bottom in terms of physical height; for example, when the filter bag 23 is inverted, the physical height of the bottom of the filter bag 23 is higher than the physical height of the bag opening) is connected to the top of the support frame 24. The connection method is not strictly limited and can be adhesive. The partition 22 has perforations 221 for the flue gas and the support frame 24 to pass through. The bag opening of the filter bag 23 faces the partition 22 and is connected to the partition 22, and the connection method can be adhesive. The bag opening of the filter bag 23 communicates with the perforations 221 one by one. The cleaning component 4 is at least partially located within the upper chamber 211 and above the support frame 24. The bag-turning assembly 3 is used to turn the cloth bag 23 over so that the cloth bag 23 is placed on the outside of the cleaning assembly 4 so that the cleaning assembly 4 can clean the cloth bag 23.

[0034] like Figures 2 to 3 As shown, specifically, the bag-flipping assembly 3 can be a vertically arranged cylinder. The bag-flipping assembly 3 is connected to the partition 22 and is used to drive the partition 22 to rise and fall so that the cloth bag 23 switches between the first state and the second state.

[0035] In the first state, both the filter bag 23 and the support frame 24 are located within the upper chamber 211, with the filter bag 23 fitted onto the support frame 24 and its opening facing the lower chamber 212. In this state, the filter bag 23 can be used for dust removal. Specifically, the flue gas in the lower chamber 212 can pass through the perforations 221 on the partition 22 and the filter bag 23, reaching the upper chamber 211 and exiting through the outlet 214, while the dust in the flue gas is blocked by the filter bag 23. Since the opening of the filter bag 23 faces downwards at this time, the blocked dust can fall directly under the action of gravity. A dust hopper 215 is provided at the bottom of the lower chamber 212 to collect the falling dust.

[0036] By raising the partition 22, the cloth bag 23 can be gradually flipped over, switching from the first state to the second state. In the second state, both the cloth bag 23 and the support frame 24 are located within the lower chamber 212, with the cloth bag 23 fitted over the outside of the cleaning assembly 4 and its opening facing the upper chamber 211. In this state, the cleaning assembly 4 can clean the cloth bag 23 without interference from the support frame 24, and any dust falling off the cloth bag 23 remains within the lower chamber 212. Furthermore, the bottom of the cloth bag 23 is fixed to the support frame 24, while the opening is fixed to the partition 22, thus allowing the cloth bag 23 to maintain a basically upright position for cleaning by the cleaning assembly 4.

[0037] The cleaning component 4 includes a bag-tapping unit 41 and an air-blowing unit 42. The bag-tapping unit 41 is used to tap the cloth bag 23, and the air-blowing unit 42 is used to blow air onto the cloth bag 23.

[0038] like Figures 2 to 4 As shown, specifically, the bag-tapping unit 41 includes a drive module 411, a first pipe 412, a bag-tapping head 413, a connecting rod 414, and a spring 415. The first pipe 412 is vertically arranged and rotatably connected to the top wall of the dust removal chamber 21. The drive module 411 is connected to the upper end of the first pipe 412 and is used to drive the first pipe 412 to rotate. The number of first pipes 412 can be one or more, and all one or more first pipes 412 are driven by the drive module 411. Figure 2 As shown, in this embodiment, there are multiple first pipes 412.

[0039] The drive module 411 may include a motor, a belt, and pulleys. The first pipe 412 is connected to the other first pipes 412 via belts and pulleys. The motor is connected to one of the first pipes 412, enabling the motor to drive the rotation of multiple first pipes 412. The specific connection method is conventional and will not be described in detail. When there is only one first pipe 412, the drive module 411 may only include the motor connected to the first pipe 412, thus saving costs.

[0040] One end of the connecting rod 414 is inserted into the first pipe 412 and is slidably connected to the first pipe 412. A limiting part 4141 is provided at the end of the connecting rod 414 inside the first pipe 412. A spring 415 is located inside the first pipe 412 and sleeved on the connecting rod 414. The opposite ends of the spring 415 abut against the inner wall of the first pipe 412 and the limiting part 4141, respectively. The end of the connecting rod 414 outside the first pipe 412 is connected to the bag-beating head 413. This arrangement ensures that when the first pipe 412 is not rotating, the gap between the bag-beating head 413 and the first pipe 412 is not particularly large, guaranteeing that the cloth bag 23 can be smoothly sleeved onto the outside of the bag-beating unit 41 during the bag-turning process. When the first pipe 412 rotates, the connecting rod 414 slides under the action of centrifugal force, the spring 415 is gradually compressed, and the distance between the bag-beating head 413 and the first pipe 412 gradually increases, ensuring that the bag-beating head 413 can smoothly beat the cloth bag 23. Furthermore, the different distances between the bag-beating head 413 and the first pipe 412 can also change the beating effect on the cloth bag 23, providing better flexibility.

[0041] like Figures 2 to 5 As shown, the bag-beating head 413 has two protrusions 4131, each of which has a set of rotating modules 416. The rotating module 416 includes a rotating cylinder 4161 and a rotating shaft 4162. The rotating cylinder 4161 is sleeved on the rotating shaft 4162 and is rotatably connected to the bag-beating head 413 through the rotating shaft 4162. When the first pipe 412 rotates, the rotating cylinder 4161 can contact the cloth bag 23, and the friction force makes the rotating cylinder 4161 rotate around the rotating shaft 4162, thereby reducing the damage to the cloth bag 23 during bag beating.

[0042] Furthermore, the rotating shaft 4162 is offset from the center of the corresponding rotating cylinder 4161, and the two rotating shafts 4162 are connected by a transmission module 417. The transmission module 417 includes a chain 4171 and two gears 4172, which are fitted one-to-one on the two rotating shafts 4162 and are connected by the chain 4171. The maximum distance between the two rotating cylinders 4161 and the first pipe 412 is different. For example, the two rotating cylinders 4161 are configured such that when the distal point (the point on the circumference of the cross-section of the rotating cylinder 4161 that is farthest from the rotating shaft 4162) of one rotating cylinder 4161 contacts the bag 23, the proximal point (the point on the circumference of the cross-section of the rotating cylinder 4161 that is closest to the rotating shaft 4162) of the other rotating cylinder 4161 contacts the bag 23. Because the rotating shaft 4162 is offset from the center of the rotating drum 4161, the maximum distance between the rotating drum 4161 and the first pipe 412 changes continuously as the rotating drum 4161 rotates. When the maximum distance between the rotating drum 4161 and the first pipe 412 increases, the rotating drum 4161 pushes the cloth bag 23 outward; when the maximum distance between the rotating drum 4161 and the first pipe 412 decreases, the cloth bag 23 gradually returns to its original position. Therefore, through the above arrangement, the two rotating drums 4161 can alternately beat the cloth bag 23, increasing the beating amplitude of the cloth bag 23, thereby enhancing the cleaning effect.

[0043] A V-shaped groove 4132 is formed between the two protrusions 4131, and an air blowing hole 4133 is provided in the V-shaped groove 4132. The connecting rod 414 has an air supply channel inside for connecting the air blowing hole 4133 and the inside of the first pipe 412. The lower end of the first pipe 412 is closed, and the upper end is connected to the air blowing unit 42. The air blowing unit 42 can introduce gas into the first pipe 412, and the gas can be blown out from the air blowing hole 4133 to unclog the cloth bag 23. The air blowing unit 42 may include an air pump, an air pipe, and a rotating joint 421. One end of the air pipe is connected to the air pump, and the other end is connected to the top of the first pipe 412 through the rotating joint 421.

[0044] Since the protrusion 4131 (the upper rotating cylinder 4161) is always in contact with the cloth bag 23, by forming a V-shaped groove 4132 between the two protrusions 4131 and placing the air blowing hole 4133 within the V-shaped groove 4132, the air blowing hole 4133 can be positioned between the two rotating cylinders 4161. This ensures that the air blowing hole 4133 is not tightly pressed against the cloth bag 23, and that the distance between the air blowing hole 4133 and the cloth bag 23 remains within a suitable range. This avoids the problem of insufficient airflow coverage due to a small distance, and also avoids the problem of severe airflow attenuation due to a large distance. Simultaneously, the V-shaped groove 4132 itself can also prevent the airflow from diverging too quickly.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flue gas dust removal device for thermal power plants, characterized in that, include: The bag filter assembly (2) includes a dust collection chamber (21), a filter bag (23) and a support frame (24). The filter bag (23) and the support frame (24) are both located in the dust collection chamber (21). The support frame (24) is used to support the filter bag (23), and the bottom of the filter bag (23) is connected to the support frame (24). A cleaning component (4) is at least partially located in the dust removal chamber (21) and is used to clean the cloth bag (23). The bag-turning assembly (3) is used to turn the cloth bag (23) over so that the cloth bag (23) is fitted over the outside of the cleaning assembly (4).

2. The flue gas dust removal device for thermal power plants according to claim 1, characterized in that: The bag filter assembly (2) further includes a partition (22), which is slidably connected to the inner wall of the dust collection chamber (21) and divides the interior of the dust collection chamber (21) into an upper chamber (211) and a lower chamber (212). The partition (22) is provided with perforations (221). The opening of the bag (23) is connected to the partition (22) and aligned with the perforations (221) one by one. The perforations (221) are used for the flue gas and the support frame (24) to pass through. The cleaning component (4) is at least partially disposed within the upper chamber (211) and located above the support frame (24); The bag-turning assembly (3) is connected to the partition (22) and is used to drive the partition (22) to rise and fall so that the cloth bag (23) switches between a first state and a second state; In the first state, the cloth bag (23) and the support frame (24) are both located in the upper chamber (211), the cloth bag (23) is sleeved on the support frame (24) and the opening of the cloth bag (23) faces the lower chamber (212). In the second state, the cloth bag (23) and the support frame (24) are both located in the lower chamber (212), the cloth bag (23) is sleeved on the outside of the cleaning component (4) and the opening of the cloth bag (23) faces the upper chamber (211). The cleaning component (4) is used to clean the cloth bag (23) in the second state.

3. The flue gas dust removal device for thermal power plants according to claim 2, characterized in that: The cleaning component (4) includes a bag-tapping unit (41) and an air-blowing unit (42); the bag-tapping unit (41) is used to tap the cloth bag (23); the air-blowing unit (42) is used to blow air onto the cloth bag (23).

4. The flue gas dust removal device for thermal power plants according to claim 3, characterized in that: The bag-beating unit (41) includes a drive module (411), a first pipe (412), a bag-beating head (413), a connecting rod (414), and a spring (415). The first pipe (412) is rotatably connected to the dust removal chamber (21); the drive module (411) is connected to the first pipe (412) and is used to drive the first pipe (412) to rotate; One end of the connecting rod (414) is inserted into the first pipe (412), and the connecting rod (414) is slidably connected to the first pipe (412); the end of the connecting rod (414) inside the first pipe (412) is provided with a limiting part (4141); the spring (415) is provided inside the first pipe (412) and sleeved on the connecting rod (414); the opposite ends of the spring (415) respectively abut against the inner wall of the first pipe (412) and the limiting part (4141); the end of the connecting rod (414) outside the first pipe (412) is connected to the bag head (413).

5. The flue gas dust removal device for thermal power plants according to claim 4, characterized in that: The bag-beating unit (41) further includes a rotating module (416), which is disposed on the bag-beating head (413). The rotating module (416) includes a rotating cylinder (4161) and a rotating shaft (4162). The rotating cylinder (4161) is sleeved on the rotating shaft (4162) and is rotatably connected to the bag-beating head (413) through the rotating shaft (4162). The rotating cylinder (4161) is configured to contact the cloth bag (23) and rotate around the rotating shaft (4162).

6. The flue gas dust removal device for thermal power plants according to claim 5, characterized in that: The number of rotating modules (416) on the bag head (413) is two sets; The rotating shaft (4162) is offset from the center of the corresponding rotating cylinder (4161), and the two rotating cylinders (4161) are configured such that when the distal point of one of the rotating cylinders (4161) contacts the cloth bag (23), the proximal point of the other rotating cylinder (4161) contacts the cloth bag (23).

7. The flue gas dust removal device for thermal power plants according to claim 6, characterized in that: The bag-patting unit (41) also includes a transmission module (417). The two shafts (4162) are connected by the transmission module (417), which includes a chain (4171) and two gears (4172). The two gears (4172) are fitted onto the two shafts (4162) in a one-to-one correspondence and are connected by the chain (4171).

8. The flue gas dust removal device for thermal power plants according to claim 6, characterized in that: The bag head (413) is provided with an air blowing hole (4133), and the inside of the connecting rod (414) is provided with an air supply channel for connecting the air blowing hole (4133) and the inside of the first pipe (412). One end of the first pipe (412) is closed, and the other end is connected to the air blowing unit (42).

9. The flue gas dust removal device for thermal power plants according to claim 8, characterized in that: The air inlet (4133) is located between the two rotating cylinders (4161).

10. The flue gas dust removal device for thermal power plants according to claim 8, characterized in that: The bag head (413) is provided with a V-shaped groove (4132), and the air blowing hole (4133) is provided in the V-shaped groove (4132).

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