On-line ash removal device of boiler air pre-heater

Abstract

The invention relates to a boiler air pre-heater on-line ash removal device, and belongs to the field of air pre-heater cleaning, the boiler air pre-heater on-line ash removal device comprises a support rail, a support seat, a plurality of scrapers, a driving part and a vibration mechanism, the support rail is arranged on an air pre-heater along a pipeline direction of the air pre-heater, the support seat is slidably arranged on the support rail, the scrapers are movably arranged on the support seat, and the driving part is arranged on the support seat. The multiple scrapers extend between the adjacent pipelines of the air pre-heater correspondingly, the driving piece is arranged on the supporting rail and used for driving the supporting base to slide, and the vibration mechanism is arranged on the supporting base and used for driving the scrapers to vibrate. The ash removal device has the advantages that the amount of ash accumulated on the air pre-heater to the two ends of the air pre-heater is reduced, and the ash removal effect and convenience of the boiler air pre-heater are effectively improved.

Description

Technical Field

[0001] This application relates to the field of air preheater cleaning, and in particular to an online ash removal device for boiler air preheaters. Background Technology

[0002] An air preheater, or simply air preheater, is a heat exchange surface in the boiler's tail flue gas duct that preheats the air entering the boiler to a certain temperature through internal heat exchange fins. It is a device used to improve the boiler's heat exchange performance and reduce energy consumption. The gas discharged from the boiler tail flue gas contains a large amount of fly ash, which easily accumulates and adheres to the air preheater, forming ash deposits. This reduces the heat exchange efficiency of the air preheater and can cause corrosion.

[0003] Currently, the commonly used methods for cleaning air preheaters are mainly divided into manual cleaning and comb plate cleaning. Manual cleaning requires a long shutdown time and involves manual entry into the air preheater, which is time-consuming, labor-intensive, and poses safety hazards. Comb plate cleaning uses a method of driving the comb plates to move back and forth. Although it can push the ash on the air preheater away, some of the ash will be pushed to both ends. With the increase of cleaning times, the ash at both ends will accumulate more and more, affecting the movement of the comb plates. It is still necessary to manually remove the ash accumulated in both sections. As a result, the convenience and effectiveness of cleaning boiler air preheaters urgently need to be improved. Summary of the Invention

[0004] To improve the efficiency and convenience of cleaning the air preheater, this application provides an online cleaning device for the air preheater.

[0005] The online ash removal device for a boiler air preheater provided in this application adopts the following technical solution: An online ash removal device for a boiler air preheater includes a support rail, a support base, scrapers, a drive component, and a vibration mechanism. The support rail is disposed on the air preheater along the pipeline direction of the air preheater. The support base is slidably disposed on the support rail. Multiple scrapers are movably disposed on the support base, and the multiple scrapers extend between adjacent pipelines of the air preheater. The drive component is disposed on the support rail and is used to drive the support base to slide. The vibration mechanism is disposed on the support base and is used to drive the scrapers to vibrate.

[0006] By adopting the above technical solution, when it is necessary to clean the boiler air preheater, the drive component drives the support base to slide along the support rail. The support base drives multiple scrapers to move between adjacent pipes of the air preheater. During the movement, the vibration mechanism drives the scrapers to vibrate. The scrapers can shake and clean the ash on the air preheater through movement and vibration, reducing the amount of ash accumulated at both ends of the air preheater, and effectively improving the cleaning effect and convenience of the boiler air preheater.

[0007] Optionally, the vibration mechanism includes a support sleeve, a connecting rod, and a vibration motor. The support sleeve is mounted on a support base, is hollow inside and open at the bottom, and has an internal dimension larger than its opening dimension. The scraper is movably inserted into the support sleeve, and the dimension of the end of the scraper inserted into the support sleeve is larger than its opening dimension. The connecting rod is mounted on multiple scrapers, and the vibration motor is mounted on the connecting rod.

[0008] By adopting the above technical solution, after the scraper is installed by inserting it into the support sleeve, the support base moves the support sleeve, which in turn moves the scraper and connecting rod. During the movement, the vibration motor drives the connecting rod to vibrate, which in turn drives the scraper to vibrate. During the vibration of the scraper, it can move within the internal opening of the support sleeve, reducing the impact of vibration on the support sleeve and support base, ensuring the stable sliding of the support base on the support rail. At the same time, the inner wall and the side wall of the opening of the support sleeve limit the vibration amplitude of the scraper, reducing the possibility of the scraper vibrating too much and hitting the air preheater, thus damaging the air preheater.

[0009] Optionally, the scraper includes a connecting part, an unfolding assembly, and a comb plate. The connecting part is slidably disposed on the support sleeve. The unfolding assembly is disposed on the connecting part and is used to unfold as the connecting part is inserted into the support sleeve. The comb plate is disposed on the connecting rod and is detachably connected to the connecting part.

[0010] By adopting the above technical solution, after inserting the connecting part into the support sleeve, the unfolding component unfolds inside the support sleeve, which allows the connecting part to be easily installed into the support sleeve, thereby facilitating the installation of the comb plate.

[0011] Optionally, the unfolding assembly includes a control sleeve, an unfolding plate, a drive screw, a bevel gear set, and a positioning component. The control sleeve is rotatably mounted on the connecting part, the unfolding plate is slidably mounted on one end of the control sleeve that extends into the support sleeve, the drive screw is rotatably mounted on the connecting part and threadedly connected to the unfolding plate, the bevel gear set is mounted on the control sleeve and is used to drive the drive screw to rotate when the control sleeve rotates, and the positioning component is mounted on the control sleeve and is used to limit the rotation of the control sleeve on the connecting part.

[0012] By adopting the above technical solution, after the control sleeve and the display panel enter the support sleeve along with the connecting part, the control sleeve is rotated, causing the connecting part to rotate relative to the control sleeve. When the connecting part rotates, the bevel gear set drives the drive screw to rotate, and the drive screw can drive the display panel to move away from the control sleeve and be displayed on the control sleeve. Then, the rotation of the control sleeve relative to the connecting part is limited by the positioning component, and the displayed display panel is positioned, thereby preventing the control sleeve and the connecting part from detaching from the support sleeve.

[0013] Optionally, the positioning element includes a positioning pin, which is slidably inserted into the control sleeve, and the connecting portion is provided with a plurality of positioning holes spaced apart circumferentially for the insertion of the positioning pin.

[0014] By adopting the above technical solution, after the connecting part rotates relative to the control sleeve by twisting the control sleeve, the positioning pin is inserted into the corresponding positioning hole at this time, which can easily lock the relative rotation of the control sleeve and the connecting part.

[0015] Optionally, the support sleeve is provided with a support assembly for supporting the display board. The support assembly includes support springs and support pads. Multiple support springs are provided on the inner wall of the support sleeve, and multiple support pads are provided on the multiple support springs. The multiple support pads are used to abut against the display board.

[0016] By adopting the above technical solution, when the display board and control sleeve are displaced inside the support sleeve, multiple support springs drive the support pads to abut against the display board and control sleeve in all directions, thereby buffering the displacement of the display board and control sleeve. This ensures that the display board can move within the support sleeve while reducing the possibility of damage caused by the comb plate causing the control sleeve and display board to vibrate within the support sleeve, thus improving the stability of the display board and control sleeve within the support sleeve.

[0017] Optionally, the connecting rod is provided with a positioning component for positioning the comb plate. The positioning component includes a positioning clamp, a positioning bolt and a positioning nut. The positioning clamp is disposed on the connecting rod, the positioning bolt is slidably disposed on the positioning clamp, the comb plate is provided with a plurality of through holes spaced apart for the positioning bolt to pass through, and the positioning nut is threaded onto the positioning bolt.

[0018] By adopting the above technical solution, after the positioning clip is installed on the connecting rod, the comb plate is moved so that the through hole on the comb plate is aligned with the positioning bolt. Then, the positioning bolt is passed through the through hole and the positioning nut is tightened. This makes it easy to position and install the comb plate on the connecting rod. Furthermore, the installation position of the comb plate can be adjusted by inserting the positioning bolt into different through holes.

[0019] Optionally, the positioning clamp includes a left clamping plate, a right clamping plate, and a clamping bolt. The right clamping plate is slidably disposed on the left clamping plate in a direction toward the left clamping plate. The connecting rod is located between the left clamping plate and the right clamping plate. The clamping bolt is rotatably disposed on the left clamping plate and threadedly connected to the right clamping plate.

[0020] By adopting the above technical solution, the positioning clamp is moved so that the left clamp and the right clamp are located on both sides of the connecting rod. Then, the left clamp and the right clamp are rotated to move closer to each other, and the clamping bolt is tightened onto the right clamp. The positioning clamp can then be easily installed at the required position on the connecting rod.

[0021] Optionally, the comb plate is provided with a soot blowing mechanism for blowing away the ash accumulated on the air preheater pipe. The soot blowing mechanism includes a water gun and an air gun. The water gun is installed on the comb plate and is connected to a water source through a pipe. The air gun is installed on the comb plate and is connected to a high-pressure air source through a pipe.

[0022] By adopting the above technical solution, during the dust removal process of the comb plate movement and vibration, water is supplied to the water gun and high-pressure air is supplied to the air gun. Water can be sprayed from the water gun to clean the dust accumulated on the air preheater. During the dust removal process of the air preheater, the air gun can also blow away the residual water stains, thereby improving the cleaning effect of the air preheater.

[0023] Optionally, the comb plate is provided with a flow cavity, which is connected to both the water gun and the air gun, and is also connected to both the water source and the high-pressure air source. A valve is provided at each connection point between the flow cavity and the water source and the high-pressure air source.

[0024] By adopting the above technical solution, a flow chamber is set inside the comb plate to facilitate the flow of water and high-pressure air, eliminating the need to supply water to the water gun and air to the air gun through pipes. By controlling the valve at the connection between the flow chamber and the water and high-pressure air, water can enter the flow chamber and be ejected from the water gun, or high-pressure air can enter the flow chamber and be ejected from the air gun, thus conveniently controlling the water gun and air gun.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The scraper can shake and clean the ash on the air preheater by moving and vibrating, reducing the amount of ash accumulating at both ends of the air preheater, and effectively improving the cleaning effect and convenience of the boiler air preheater. 2. During the vibration of the comb plate, it can move within the internal opening of the support sleeve, reducing the impact of vibration on the support sleeve and support base, ensuring the stable sliding of the support base on the support rail. At the same time, the inner wall and the side wall of the opening of the support sleeve limit the vibration amplitude of the comb plate, reducing the possibility of the comb plate vibrating too much and hitting the air preheater, which could damage the air preheater. 3. Water can be sprayed from the water gun to clean the dust accumulated on the air preheater. During the cleaning process of the air preheater, the air gun can also blow away the residual water stains, improving the cleaning effect of the air preheater. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the online ash removal device for the boiler air preheater according to an embodiment of this application.

[0027] Figure 2 This is a structural schematic diagram from another perspective of an embodiment of this application.

[0028] Figure 3This is a schematic cross-sectional view of the scraper according to an embodiment of this application.

[0029] Reference numerals: 1. Support rail; 2. Support base; 3. Scraper; 31. Connecting part; 32. Unfolding assembly; 321. Control sleeve; 322. Unfolding plate; 323. Drive screw; 324. Bevel gear set; 352. Positioning component; 3251. Positioning pin; 33. Comb plate; 4. Drive component; 5. Vibration mechanism; 51. Support sleeve; 52. Connecting rod; 53. Vibration motor; 6. Support assembly; 61. Support spring; 62. Support pad; 7. Positioning assembly; 71. Positioning clamp; 711. Left clamping plate; 712. Right clamping plate; 713. Clamping bolt; 72. Positioning bolt; 73. Positioning nut; 8. Soot blowing mechanism; 81. Water gun; 82. Air gun. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses an online ash removal device for a boiler air preheater.

[0032] Reference Figure 1 , Figure 2 The online ash removal device for boiler air preheater includes a support rail 1, a support base 2, a scraper 3, a drive component 4, a vibration mechanism 5, a support assembly 6, a positioning assembly 7, and an ash blowing mechanism 8.

[0033] Reference Figure 1 , Figure 2 The support rail 1 is installed above the air preheater. The support seat 2 is slidably installed on the support rail 1 along the length of the air preheater's pipe. The drive component 4 is installed on the support rail 1 and is used to drive the support seat 2 to slide. The drive component 4 can be a linear drive such as a cylinder or a motor screw. In this embodiment, the drive component 4 is a cylinder, which is installed on the support rail 1. The piston rod of the cylinder is connected to the support seat 2. By controlling the extension and retraction of the piston rod of the cylinder, the support seat 2 can be driven to slide on the support rail 1.

[0034] Reference Figure 1 , Figure 2Multiple scraper blades 3 are movably installed on the support base 2. The multiple scraper blades 3 extend vertically into the adjacent pipes of the air preheater in a one-to-one correspondence. The multiple scraper blades 3 are distributed in two rows at intervals along the sliding direction of the support base 2. The vibration mechanism 5 is installed on the support base 2. The vibration mechanism 5 is used to drive the scraper blades 3 to vibrate. The vibration mechanism 5 includes a support sleeve 51, a connecting rod and a vibration motor 53. In this embodiment, the support sleeve 51 is positioned on the support base 2 by a clamp, so that the operator can adjust the installation position of the support sleeve 51 after loosening the clamp. The support sleeve 51 is hollow inside and open at the lower end. The internal size of the support sleeve 51 is larger than the opening size of the support sleeve 51. The scraper blades 3 are slidably inserted into the support sleeve 51. The size of the end of the scraper blade 3 inserted into the support sleeve 51 is larger than the opening size of the support sleeve 51. The connecting rod 52 is horizontally connected to the multiple scraper blades 3. The vibration motor 53 is installed on the connecting rod 52.

[0035] The staff installs the support sleeve 51 to the designated position on the support base 2 using clamps, and then installs the scraper 3 inside the support sleeve 51. When the support base 2 moves, the vibration motor 53 is started, and the support base 2 drives the support sleeve 51 to move. The support sleeve 51 can then drive the scraper 3 to move between adjacent pipes of the air preheater. At the same time, the vibration motor 53 drives the scraper 3 to vibrate through the connecting rod 52. Through movement and vibration, the scraper 3 can shake and clean the accumulated ash on the air preheater, reducing the amount of ash accumulating at both ends of the air preheater. Furthermore, the scraper 3 can move within the internal opening of the support sleeve 51 during vibration, reducing the impact of vibration on the support sleeve 51 and the support base 2, ensuring the stable sliding of the support base 2 on the support rail 1. At the same time, the inner wall and the opening side wall of the support sleeve 51 limit the vibration amplitude of the scraper 3, reducing the possibility of the scraper 3 vibrating too much and hitting the air preheater, thus causing damage to the air preheater.

[0036] Reference Figure 2 , Figure 3The scraper 3 includes a connecting part 31, an unfolding component 32, and a comb plate 33. The connecting part 31 is slidably inserted into the support sleeve 51, and the unfolding component 32 is installed on the connecting part 31. The unfolding component 32 is used to unfold after the connecting part 31 is inserted into the support sleeve 51. The unfolding component 32 includes a control sleeve 321, an unfolding plate 322, a drive screw 323, a bevel gear set 324, and a positioning element 352. The control sleeve 321 is rotatably sleeved on one end of the connecting part 31 inserted into the support sleeve 51. The unfolding plate 322 is slidably inserted into the outer wall of the end of the control sleeve 321 that extends into the support sleeve 51, and the unfolding plate 322 can rotate relative to the control sleeve 321. That is, the control sleeve 321 has a horizontally open annular notch for the unfolding plate 322 to pass through and slide horizontally. The drive screw 323 is rotatably installed on the connecting part 31 and is threadedly connected to the unfolding plate 322. In this embodiment, two unfolding plates 322 are symmetrically slidably inserted into the control sleeve 321. The moving screw 323 is a bidirectional screw. Both ends of the driving screw 323 are threadedly connected to a display plate 322. The threads at both ends of the driving screw 323 are in opposite directions. The bevel gear set 324 is mounted on the control sleeve 321. The bevel gear set 324 is used to drive the driving screw 323 to rotate when the control sleeve 321 rotates. That is, one bevel gear of the bevel gear set 324 is coaxially mounted on the control sleeve 321, and the other bevel gear of the bevel gear set 324 is coaxially mounted on the driving screw 323. The two bevel gears mesh with each other. The positioning member 352 is mounted on the control sleeve 321. The positioning member 352 is used to restrict the rotation of the control sleeve 321 on the connecting part 31. The positioning member 352 includes a positioning pin 3251, which slides through the control sleeve 321. The connecting part 31 has multiple positioning holes spaced apart circumferentially for the insertion of the positioning pin 3251. The comb plate 33 is mounted on the connecting rod 52 and is connected to the flange of the connecting part 31.

[0037] When installing the scraper 3, the movable connecting part 31 causes the control sleeve 321 to insert into the support sleeve 51. The control sleeve 321 moves the display plate 322 into the support sleeve 51. Then, the control sleeve 321 is turned, causing it to rotate relative to the connecting part 31. The control sleeve 321 drives the drive screw 323 to rotate via the bevel gear set 324. The drive screw 323 drives the two display plates 322 to move away from the center of the control sleeve 321, thus allowing the two display plates 322 to extend out of the control sleeve 321. Then, the positioning pin 3251 passes through the control sleeve 321 and is inserted into the support sleeve 51. The relative rotation of the control sleeve 321 and the connecting part 31 can be easily locked in the corresponding positioning hole, thereby locking the control sleeve 321 and keeping the display plate 322 stably in the display state. When the control sleeve 321 is separated from the support sleeve 51, the display plate 322 abuts against the opening of the support sleeve 51, thereby restricting the control sleeve 321 from being separated from the support sleeve 51. This allows for a convenient and quick connection between the comb plate 33 and the support sleeve 51. Furthermore, the control sleeve 321 can be twisted in the opposite direction to retract the display plate 322 and the control sleeve 321, thus removing the control sleeve 321 from the support sleeve 51.

[0038] Reference Figure 2 , Figure 3 The positioning component 7 is installed on the connecting rod 52. The positioning component 7 is used to position the comb plate 33. The positioning component 7 includes a positioning clamp 71, a positioning bolt 72 and a positioning nut 73. The positioning clamp 71 is installed on the connecting rod 52. The positioning clamp 71 includes a left clamping plate 711, a right clamping plate 712 and a clamping bolt 713. The right clamping plate 712 is slidably installed on the left clamping plate 711 in the direction toward the left clamping plate 711. The right clamping plate 712 and the left clamping plate 711 are located on both sides of the connecting rod 52 respectively. The clamping bolt 713 is rotatably installed on the left clamping plate 711 and is threadedly connected to the right clamping plate 712. The positioning bolt 72 is slidably inserted on the left clamping plate 711. The positioning nut 73 is threadedly installed on the positioning bolt 72. The comb plate 33 has a plurality of vertically spaced through holes for the positioning bolt 72 to pass through.

[0039] When installing the comb plate 33 onto the connecting rod 52, first move the positioning clamp 71 so that the left clamp 711 and the right clamp 712 are located on both sides of the connecting rod 52. Then, tighten the clamping bolt 713 so that the left clamp 711 and the right clamp 712 move closer to each other and clamp onto the connecting rod 52. Position the positioning clamp 71 on the connecting rod 52. Next, move the comb plate 33 so that the positioning bolt 72 is aligned with one of the through holes on the comb plate 33. Pass the positioning bolt 72 through the through hole and then tighten the positioning nut 73. The comb plate 33 can be quickly and easily positioned and installed on the connecting rod 52. By adjusting the position of the positioning clamp 71 and the position of the positioning bolt 72 through different holes, the horizontal and vertical positions of the comb plate 33 can also be adjusted, improving the applicability of the comb plate 33 to different installation positions. Furthermore, the staff can easily remove the comb plate 33 for maintenance and replacement by unscrewing the positioning nut 73, pulling the positioning bolt 72 out of the hole, and disconnecting the flange connection between the comb plate 33 and the connecting part 31.

[0040] Reference Figure 3 The support assembly 6 is installed on the support sleeve 51. The support assembly 6 is used to support the display board 322. The support assembly 6 includes support springs 61 and support pads 62. Multiple support springs 61 are installed circumferentially on the inner wall of the support sleeve 51. One support pad 62 is provided on each of the multiple support springs 61 on the inner wall of each side of the support sleeve 51. The multiple support pads 62 abut against different sides of the display board 322 and the support sleeve 51 respectively.

[0041] The connecting part 31 drives the display plate 322 and the control sleeve 321 to extend into the support sleeve 51. After the display plate 322 is displayed, multiple support springs 61 drive multiple support pads 62 to abut against different sides of the display plate 322 and the control sleeve 321, thereby supporting different sides of the display plate 322 and the control sleeve 321. This ensures that the display plate 322 can move within the support sleeve 51, while buffering the displacement of the display plate 322 and the control sleeve 321. This reduces the possibility of damage caused by the comb plate 33 causing the control sleeve 321 and the display plate 322 to vibrate within the support sleeve 51, and improves the stability of the display plate 322 and the control sleeve 321 within the support sleeve 51.

[0042] Reference Figure 2 , Figure 3 The soot blowing mechanism 8 is installed on the comb plate 33. The soot blowing mechanism 8 is used to blow away the accumulated ash on the air preheater pipe. The soot blowing mechanism 8 includes a water gun 81 and an air gun 82. The comb plate 33 is hollow to form a flow cavity. Multiple water guns 81 and air guns 82 are installed on the comb plate 33. Both water guns 81 and air guns 82 are connected to the flow cavity. The flow cavity is connected to an external water source and a high-pressure air source through pipes. Valves are installed on the pipes connecting the flow cavity to the water source and the pipes connecting the flow cavity to the high-pressure air source.

[0043] During the movement of the comb plate 33, the valve connecting the flow chamber to the water source is first opened, allowing water to enter the flow chamber and then be ejected from the water gun 81. As the comb plate 33 moves, it sprays water onto the accumulated ash on the air preheater, washing away the ash. When the comb plate 33 moves along the air preheater for one stroke and then returns, the valve connecting the flow chamber to the water source is closed, and the valve connecting the connecting chamber to the high-pressure air source is opened. The high-pressure air source enters the connecting chamber and is then ejected from the air gun 82. The high-pressure gas blows away the residual ash and water stains on the air preheater. Furthermore, the water ejected from the water gun 81 and the high-pressure gas ejected from the air gun 82 can also clean the ash accumulated between the transverse pipes of the air preheater, effectively improving the cleaning effect on the air preheater.

[0044] The implementation principle of the online ash removal device for boiler air preheater in this application embodiment is as follows: the driving component 4 drives the support base 2 to slide along the support rail 1, and the support base 2 drives the comb plate 33 to move between adjacent pipes of the air preheater along the pipe direction of the air preheater. During the process, the vibration motor 53 drives the comb plate 33 to vibrate, and the water gun 81 sprays water to shake and flush away the ash on the air preheater for cleaning. In addition, the water gun 81 and the air gun 82 can also clean the ash between adjacent pipes in the transverse direction of the air preheater, reducing the amount of ash accumulated at both ends of the air preheater, effectively improving the ash removal effect and convenience of the boiler air preheater.

[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. An online ash removal device for a boiler air preheater, characterized in that: The device includes a support rail (1), a support base (2), a scraper (3), a drive component (4), and a vibration mechanism (5). The support rail (1) is arranged on the air preheater along the pipeline direction of the air preheater. The support base (2) is slidably arranged on the support rail (1). Multiple scrapers (3) are movably arranged on the support base (2). The multiple scrapers (3) extend between adjacent pipelines of the air preheater. The drive component (4) is arranged on the support rail (1) and is used to drive the support base (2) to slide. The vibration mechanism (5) is arranged on the support base (2) and is used to drive the scrapers (3) to vibrate.

2. The online ash removal device for boiler air preheater according to claim 1, characterized in that: The vibration mechanism (5) includes a support sleeve (51), a connecting rod (52), and a vibration motor (53). The support sleeve (51) is mounted on the support base (2). The support sleeve (51) is hollow inside and open at the bottom. The internal size of the support sleeve (51) is larger than the opening size of the support sleeve (51). The scraper (3) is movably inserted into the support sleeve (51). The size of the end of the scraper (3) inserted into the support sleeve (51) is larger than the opening size of the support sleeve (51). The connecting rod (52) is mounted on multiple scrapers (3). The vibration motor (53) is mounted on the connecting rod (52).

3. The online ash removal device for boiler air preheater according to claim 2, characterized in that: The scraper (3) includes a connecting part (31), an unfolding component (32), and a comb plate (33). The connecting part (31) is slidably disposed on the support sleeve (51). The unfolding component (32) is disposed on the connecting part (31) and is used to unfold as the connecting part (31) is inserted into the support sleeve (51). The comb plate (33) is disposed on the connecting rod (52) and is detachably connected to the connecting part (31).

4. The online ash removal device for boiler air preheater according to claim 3, characterized in that: The unfolding assembly (32) includes a control sleeve (321), an unfolding plate (322), a drive screw (323), a bevel gear set (324), and a positioning element (352). The control sleeve (321) is rotatably mounted on the connecting part (31). The unfolding plate (322) is slidably mounted on one end of the control sleeve (321) that extends into the support sleeve (51). The drive screw (323) is rotatably mounted on the connecting part (31) and threadedly connected to the unfolding plate (322). The bevel gear set (324) is mounted on the control sleeve (321) and is used to drive the drive screw (323) to rotate when the control sleeve (321) rotates. The positioning element (352) is mounted on the control sleeve (321) and is used to limit the rotation of the control sleeve (321) on the connecting part (31).

5. The online ash removal device for boiler air preheater according to claim 4, characterized in that: The positioning component (352) includes a positioning pin (3251), which is slidably inserted into the control sleeve (321). The connecting part (31) has a plurality of positioning holes spaced apart circumferentially for the insertion of the positioning pin (3251).

6. The online ash removal device for boiler air preheater according to claim 4, characterized in that: The support sleeve (51) is provided with a support component (6) for supporting the display board (322). The support component (6) includes a support spring (61) and a support pad (62). Multiple support springs (61) are provided on the inner wall of the support sleeve (51). Multiple support pads (62) are provided on the multiple support springs (61). The multiple support pads (62) are used to abut against the display board (322).

7. The online ash removal device for boiler air preheater according to claim 3, characterized in that: The connecting rod (52) is provided with a positioning component (7) for positioning the comb plate (33). The positioning component (7) includes a positioning clamp (71), a positioning bolt (72) and a positioning nut (73). The positioning clamp (71) is provided on the connecting rod (52). The positioning bolt (72) is slidably inserted on the positioning clamp (71). The comb plate (33) is provided with a plurality of through holes spaced apart for the positioning bolt (72) to pass through. The positioning nut (73) is threaded onto the positioning bolt (72).

8. The online ash removal device for boiler air preheater according to claim 7, characterized in that: The positioning clamp (71) includes a left clamping plate (711), a right clamping plate (712), and a clamping bolt (713). The right clamping plate (712) is slidably disposed on the left clamping plate (711) in the direction toward the left clamping plate (711). The connecting rod (52) is located between the left clamping plate (711) and the right clamping plate (712). The clamping bolt (713) is rotatably disposed on the left clamping plate (711) and threadedly connected to the right clamping plate (712).

9. The online ash removal device for boiler air preheater according to claim 3, characterized in that: The comb plate (33) is provided with a dust blowing mechanism (8) for blowing away the ash accumulated on the air preheater pipe. The dust blowing mechanism (8) includes a water gun (81) and an air gun (82). The water gun (81) is provided on the comb plate (33) and is connected to a water source through a pipe. The air gun (82) is provided on the comb plate (33) and is connected to a high-pressure air source through a pipe.

10. The online ash removal device for boiler air preheater according to claim 9, characterized in that: The comb plate (33) is provided with a flow chamber, which is connected to both the water gun (81) and the air gun (82). The flow chamber is also connected to both the water source and the high-pressure air source. A valve is provided at each connection point between the flow chamber and the water source and the high-pressure air source.

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