Flexible contact sealing method and sealing device for air preheater of power plant boiler

Abstract

The application discloses a flexible contact sealing method and sealing device for an air preheater of a power station boiler and belongs to the field of flexible contact sealing of air preheaters. The flexible contact sealing method and sealing device for the air preheater of the power station boiler comprises a mounting plate, a rotating plate is rotationally connected to the upper end of the mounting plate, a lower sliding block is arranged on the upper side of the rotating plate, an upper sliding block is fixedly connected to the lower sliding block through screws, a rotating shaft is arranged in the top end of the upper sliding block, a group of arc-shaped sleeves are fixedly connected to the inner side wall of the mounting plate, and a group of arc-shaped rods matched with the arc-shaped sleeves are fixedly connected to the inner side wall of the rotating plate. The arc-shaped sleeves, the arc-shaped rods, the extruding blocks and the elastic membranes are used to make the rotating plate rotate and rebound by extruding air, springs are not needed, the phenomenon of spring fatigue failure and breakage is avoided, the failure rate is reduced, and the working efficiency of the air preheater is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of flexible contact sealing technology for air preheaters, and more particularly to a flexible contact sealing method and sealing device for air preheaters in power plant boilers. Background Technology

[0002] An air preheater is a device that uses the heat from the flue gas at the boiler's tail end to heat the air, thereby reducing the exhaust gas temperature and minimizing boiler exhaust losses. Furthermore, the heated air, when introduced into the furnace, ensures rapid and complete ignition of the fuel, reducing mechanical and chemical combustion losses and improving boiler efficiency. The air, after passing through the air preheater, is then fed into the furnace. The increased temperature of the incoming air correspondingly raises the furnace temperature, facilitating rapid fuel ignition, improving or enhancing combustion, and ensuring stable ignition under low loads. The radiative heat transfer within the furnace is proportional to the fourth power of the average flame temperature. The increased temperature of the hot air entering the furnace raises the average flame temperature, thus enhancing radiative heat transfer within the furnace. Under the same evaporative heat absorption conditions, this also reduces the heating surface area of ​​the water-cooled wall tubes, saving metal consumption. Additionally, it improves the operating conditions of the induced draft fan and reduces its power consumption.

[0003] Air preheaters are commonly used in coal-fired power plant boilers and can be divided into tube-and-box type and rotary type. During operation, when the rotor rotates, a gap inevitably exists between it and the stationary outer casing. Due to the high air pressure and low flue gas pressure, a pressure difference exists between the two, causing air from the inlet channel to enter the flue gas channel, resulting in air leakage. Excessive air leakage can lead to adverse effects such as reduced preheater inlet air pressure, increased fan current, increased excess air coefficient after preheating, decreased flue gas temperature, reduced boiler thermal efficiency, increased coal consumption, and the boiler failing to reach its rated load.

[0004] To address the air leakage problem, Chinese Patent Publication No. CN205979856U discloses a flexible contact sealing device for a rotary air preheater. The flexible contact sealing slider is mounted on a hinged spring and is installed on the radial rotor grid plate of the air preheater. When not entering the fan-shaped plate, the flexible contact sealing slider protrudes 5mm-8mm above the fan-shaped plate. The flexible contact sealing slider is a self-lubricating alloy slider. This method can reduce the air leakage rate of the air preheater and improve the efficiency of the power plant boiler, but it has the following problems:

[0005] 1. In the existing technology, springs are used for elastic support to achieve flexible sealing. However, springs are prone to losing elasticity and breaking at high temperatures, which can easily lead to malfunctions.

[0006] 2. Existing technology only uses springs for elastic support. If the springs break, the effect of flexible sealing will be reduced, and the machine will need to be shut down for maintenance. The maintenance time is short, which reduces the service life.

[0007] 3. In the existing technology, the slider and the sector plate generate static friction, which is prone to wear after long-term use, reducing the effect of flexible sealing. At the same time, it is inconvenient to replace the worn slider parts, requiring the replacement of the entire part, which easily leads to waste of resources. Summary of the Invention

[0008] The purpose of this invention is to solve the problems of easy damage, high failure rate of single support, and inconvenience in replacing worn parts in the flexible sealing device using springs in the prior art. Therefore, this invention proposes a flexible contact sealing method and sealing device for air preheaters of power plant boilers.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A flexible contact sealing device for an air preheater in a power plant boiler includes a mounting plate. A rotating plate is rotatably connected to the upper end of the mounting plate. A lower slider is provided on the upper side of the rotating plate. An upper slider is fixedly connected to the lower slider by screws. A rotating shaft is provided at the top of the upper slider. A set of arc-shaped sleeves is fixedly connected to the inner wall of the mounting plate. A set of arc-shaped rods matching the arc-shaped sleeves is fixedly connected to the inner wall of the rotating plate. The end of the arc-shaped rod away from the rotating plate extends into the interior of the arc-shaped sleeve and is fixedly connected to a pressing block. A groove is formed in the pressing block, and an elastic membrane is fixedly connected to the outer end of the groove. The inner wall of the mounting plate is fixedly connected to... The device includes a support plate, an air cylinder on its upper surface, a partition plate fixedly connected to the center of the air cylinder, guide frames at both ends of the air cylinder, and a movable rod slidably connected within each guide frame. A piston is fixedly connected to one end of each movable rod inside the air cylinder, and a first movable seat is fixedly connected to the outer end of each movable rod. A movable rod is rotatably connected within the first movable seat, and a second movable seat is rotatably connected to the end of the movable rod away from the first movable seat. A connecting block is fixedly connected to the upper surface of the second movable seat, and a third movable seat is rotatably connected to the outside of the connecting block. The upper surface of the third movable seat is fixedly connected to the side wall of the rotating plate.

[0011] As a preferred technical solution of this application, both ends of the rotating shaft are rotatably connected to rotating sleeves, and a fixing rod is fixedly connected to the outer wall of the bottom end of the rotating sleeve. The fixing rod is fixedly connected to the upper slider by screws.

[0012] As a preferred technical solution of this application, the upper slider is provided with a placement groove that matches the rotating shaft, and the inclined surface of the upper slider and the outer surface of the rotating shaft are both provided with a metal-ceramic coating.

[0013] As a preferred technical solution of this application, a slot is provided in the upper end face of the lower slider, and a block is provided in the slot. The upper end face of the block is fixedly connected to the lower end face of the upper slider.

[0014] As a preferred technical solution of this application, a limiting frame is provided on the outer side of the lower slider, and the limiting frame is fixedly connected to the outer peripheral sidewall of the rotating plate. The limiting frame is fixedly connected to the lower slider by screws.

[0015] As a preferred technical solution of this application, the air cylinder is provided with two clamps symmetrically, and the two clamps are respectively fixedly connected to the bearing plate by bolts.

[0016] As a preferred technical solution of this application, a baffle is provided on the outer side of the rotating part of the mounting plate and the rotating plate, and the baffle is fixedly connected to the mounting plate by screws.

[0017] As a preferred technical solution of this application, a set of mounting holes are evenly provided at the bottom end of the mounting plate, and each mounting hole is provided with a mounting bolt, and each mounting bolt is threaded with a nut.

[0018] As a preferred technical solution of this application, the mounting plate is installed on the radial rotor grid plate of the air preheater.

[0019] The present invention also provides a sealing method for a flexible contact sealing device for an air preheater in a power plant boiler, comprising the following steps:

[0020] S1: First, install the mounting plate onto the radial rotor grid plate using mounting bolts and nuts;

[0021] S2: As the mounting plate rotates with the partition plate, the upper slider first contacts the sector plate, causing the rotating plate to rotate, thereby causing the rotating shaft to abut against the sector plate. As the rotating plate rotates, the arc rod rotates, and the arc rod drives the extrusion block to move inside the arc sleeve, thereby compressing the air inside the arc sleeve. During the air compression process, the elastic membrane deforms.

[0022] S3: While the rotating plate is rotating, the third movable seat rotates together with the rotating plate, thereby driving the movable rod to rotate, which in turn causes the moving rod to move inward at the same time. As the moving rod moves inward, the piston moves inward at the same time, thereby compressing the air in the air cylinder.

[0023] S4: When the sector plate rotates and does not collide with the rotating shaft, the rotating plate is not subjected to external force. The compressed gas inside the arc sleeve pushes the extrusion block to reset, the elastic membrane recovers, and the arc rod resets and moves. At the same time, the compressed gas inside the air cylinder pushes the piston outward to move, which in turn moves the moving rod outward, thus resetting the rotating plate and facilitating subsequent flexible sealing.

[0024] Compared with the prior art, the present invention provides a flexible contact sealing method and sealing device for air preheaters of power plant boilers, which has the following beneficial effects:

[0025] 1. The flexible contact sealing method and sealing device for the air preheater of the power plant boiler uses an arc-shaped sleeve, an arc-shaped rod, a compression block and an elastic membrane to compress air and cause the rotating plate to rotate and rebound. This eliminates the need for springs, avoids spring fatigue failure and breakage, reduces the failure rate and significantly improves the working efficiency of the air preheater.

[0026] 2. The flexible contact sealing method and sealing device for the air preheater of the power plant boiler, through the air cylinder, guide frame, moving rod, piston, first movable seat, moving rod, second movable seat, connecting block and third movable seat, can cooperate with the extrusion block to perform double flexible sealing on the arc plate, improve the sealing effect, achieve good sealing effect and ensure long-term safe operation, with a very low probability of maintenance, significantly improve the maintenance time limit and extend the service life.

[0027] 3. The flexible contact sealing method and sealing device for the air preheater of the power plant boiler changes the static friction with the arc plate to dynamic friction through the upper slider and rotating shaft, reducing the wear between the slider and the arc plate. The rotating sleeve and fixed rod also facilitate the replacement of worn slider parts without replacing the entire sealing device, thus avoiding the waste of resources. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the sealing device proposed in this invention;

[0029] Figure 2 This is a side view of the sealing device proposed in this invention.

[0030] Figure 3 This invention proposes Figure 2 Enlarged structural diagram at point A;

[0031] Figure 4 This is a front view schematic diagram of the sealing device proposed in this invention;

[0032] Figure 5 This invention proposes Figure 4 Cross-sectional view along the BB direction;

[0033] Figure 6 This is a schematic diagram of the structure of the air cylinder and its connecting components proposed in this invention;

[0034] Figure 7 This is a three-dimensional structural diagram of the sealing device proposed in this invention;

[0035] Figure 8This is a schematic diagram of the structure proposed in this invention, which separates the baffle from the mounting plate.

[0036] In the diagram: 1. Mounting plate; 2. Rotating plate; 3. Lower slider; 4. Upper slider; 5. Rotating shaft; 6. Arc sleeve; 7. Arc rod; 8. Extrusion block; 9. Elastic membrane; 10. Bearing plate; 11. Air cylinder; 12. Divider plate; 13. Guide frame; 14. Moving rod; 15. Piston; 16. First movable seat; 17. Movable rod; 18. Second movable seat; 19. Connecting block; 20. Third movable seat; 21. Rotating sleeve; 22. Fixed rod; 23. Clamping block; 24. Limiting frame; 25. Clamp; 26. Baffle; 27. Mounting bolt; 28. Nut. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0040] Reference Figure 1-8A flexible contact sealing device for an air preheater in a power plant boiler includes a mounting plate 1. A rotating plate 2 is rotatably connected to the upper end of the mounting plate 1. A lower slider 3 is provided on the upper side of the rotating plate 2. An upper slider 4 is fixedly connected to the lower slider 3 by screws. A rotating shaft 5 is provided at the top of the upper slider 4. A set of arc-shaped sleeves 6 are fixedly connected to the inner wall of the mounting plate 1. A set of arc-shaped rods 7 matching the arc-shaped sleeves 6 are fixedly connected to the inner wall of the rotating plate 2. The end of the arc-shaped rods 7 away from the rotating plate 2 extends into the interior of the arc-shaped sleeves 6 and is fixedly connected to a pressing block 8. A groove is provided in the pressing block 8, and an elastic membrane 9 is fixedly connected to the outer end of the groove. The inner side of the mounting plate 1... A bearing plate 10 is fixedly connected to the side wall. An air cylinder 11 is provided on the upper end face of the bearing plate 10. A partition plate 12 is fixedly connected to the center of the air cylinder 11. Guide frames 13 are provided at both ends of the air cylinder 11. A moving rod 14 is slidably connected in each guide frame 13. A piston 15 is fixedly connected to one end of the moving rod 14 inside the air cylinder 11. A first movable seat 16 is fixedly connected to the outer end of the moving rod 14. A movable rod 17 is rotatably connected in the first movable seat 16. A second movable seat 18 is rotatably connected to the end of the movable rod 17 away from the first movable seat 16. A connecting block 19 is fixedly connected to the upper end face of the second movable seat 18. A third movable seat 20 is rotatably connected to the outer side of the 19th component, and the upper end face of the third movable seat 20 is fixedly connected to the side wall of the rotating plate 2. The rotating plate 2 allows for easy rotation, thereby driving the upper slider 4 to rotate, which in turn allows the rotating shaft 5 to abut against the arc-shaped plate. The upper slider 4, fixed to the lower slider 3 by screws, is easy to replace after wear. Compared with existing technology, this avoids the waste of resources caused by replacing the entire component. The arc-shaped sleeve 6 rotates with the rotating plate 2, thereby driving the arc-shaped rod 7 to move within the arc-shaped sleeve 6, which in turn allows the extrusion block 8 to move, thereby compressing the air within the arc-shaped sleeve 6. The elastic membrane 9 can increase the air compression effect and improve the rebound effect of the rotating plate 2, thereby enabling flexible contact sealing. The rotation of the rotating plate 2 can cause the connecting block 19 to rotate, thereby causing the movable rod 17 to move. The movement of the movable rod 17 can cause the moving rod 14 to move, thereby enabling the piston 15 to compress the air in the air cylinder 11, facilitating the rotation of the rotating plate 2 and also enabling the rotating plate 2 to reset. It can provide double support for the rotating plate 2, which has a multi-support effect compared with the existing technology, reduces the failure rate, improves the effect of flexible contact sealing, and ensures long-term safe operation.

[0041] Reference Figure 3 In some embodiments, rotating sleeves 21 are rotatably connected to both ends of the rotating shaft 5. A fixing rod 22 is fixedly connected to the outer wall of the bottom end of the rotating sleeve 21. The fixing rod 22 is fixedly connected to the upper slider 4 by screws. The rotating sleeve 21 facilitates the rotation of the rotating shaft 5, and the fixing rod 22 facilitates the limitation of the position of the rotating shaft 5, making it convenient to replace the rotating shaft 5 and the upper slider 4.

[0042] Reference Figure 3 In some embodiments, the upper slider 4 has a placement groove that matches the rotating shaft 5. The inclined surface of the upper slider 4 and the outer surface of the rotating shaft 5 are both coated with a metal ceramic coating. The placement groove facilitates the rotation of the rotating shaft 5, and the metal ceramic coating can increase the friction between the inclined surface of the upper slider 4 and the rotating shaft 5, thereby improving the service life.

[0043] Reference Figure 3 In some embodiments, a slot is provided in the upper end face of the lower slider 3, and a locking block 23 is provided in the slot. The upper end face of the locking block 23 is fixedly connected to the lower end face of the upper slider 4. The locking block 23 can improve the stability of the upper slider 4, facilitate assembly, and increase the strength to withstand force.

[0044] Reference Figure 1 In some embodiments, a limiting frame 24 is provided on the outer side of the lower slider 3, and the limiting frame 24 is fixedly connected to the outer peripheral side wall of the rotating plate 2. The limiting frame 24 is fixedly connected to the lower slider 3 by screws. The limiting frame 24 facilitates the limiting of the lower slider 3, facilitates the disassembly and assembly of the lower slider 3, and facilitates later maintenance and replacement.

[0045] Reference Figure 6 In some embodiments, two clamps 25 are symmetrically provided on the air cylinder 11. The two clamps 25 are fixedly connected to the bearing plate 10 by bolts. The clamps 25 can conveniently limit the position of the air cylinder 11, ensuring the stability of the air cylinder 11. The setup is simple and convenient to use.

[0046] Reference Figure 8 In some embodiments, a baffle 26 is provided on the outer side of the rotating part of the mounting plate 1 and the rotating plate 2. The baffle 26 is fixedly connected to the mounting plate 1 by screws. The baffle 26 can conveniently cover the gap at the bottom of the mounting plate 1 and the rotating plate 2, thereby improving the sealing effect.

[0047] Reference Figure 7 In some embodiments, a set of mounting holes are evenly provided at the bottom end of the mounting plate 1, and each mounting hole is provided with a mounting bolt 27, and each mounting bolt 27 is threaded with a nut 28; this facilitates the installation of the mounting plate 1 with the grid plate of the air preheater, and makes assembly and disassembly convenient.

[0048] Reference Figure 1 In some embodiments, the mounting plate 1 is mounted on the radial rotor grid plate of the air preheater; this facilitates the installation and use of the mounting plate 1. It is worth noting that the rotor grid plate is provided with mounting holes that match the mounting bolts 27.

[0049] The present invention also provides a sealing method for a flexible contact sealing device for an air preheater in a power plant boiler, comprising the following steps:

[0050] S1: First, install the mounting plate 1 onto the radial rotor grid plate using the mounting bolt 27 and nut 28;

[0051] S2: As the mounting plate 1 rotates with the partition plate, the upper slider 4 first contacts the sector plate, causing the rotating plate 2 to rotate, thereby causing the rotating shaft 5 to abut against the sector plate. As the rotating plate 2 rotates, the arc rod 7 rotates. The arc rod 7 drives the extrusion block 8 to move inside the arc sleeve 6, thereby compressing the air inside the arc sleeve 6. During the air compression process, the elastic membrane 9 deforms.

[0052] S3: While the rotating plate 2 is rotating, the third movable seat 20 rotates together with the rotating plate 2, thereby driving the movable rod 17 to rotate, which in turn causes the moving rod 14 to move inward at the same time. While the moving rod 14 moves inward, the piston 15 moves inward at the same time, thereby compressing the air in the air cylinder 11.

[0053] S4: When the sector plate rotates and does not collide with the rotating shaft 5, the rotating plate 2 is not subjected to external force. The compressed gas in the arc sleeve 6 pushes the extrusion block 8 to reset, the elastic membrane 9 recovers, and the arc rod 7 resets and moves. At the same time, the compressed gas in the air cylinder 11 pushes the piston 15 outward to move, and the moving rod 14 moves outward at the same time, thereby resetting the rotating plate 2, which facilitates subsequent flexible sealing.

[0054] Specifically, in use, the flexible contact sealing method and sealing device of the boiler air preheater of this power plant are as follows: First, the mounting plate 1 is installed on the radial rotor grid plate using the mounting bolt 27 and nut 28. Then, as the mounting plate 1 rotates with the grid plate, the upper slider 4 contacts the sector plate, causing the rotating plate 2 to rotate. This causes the rotating shaft 5 to abut against the sector plate. As the rotating plate 2 rotates, the arc rod 7 rotates, and the arc rod 7 drives the extrusion block 8 to move within the arc sleeve 6, thereby compressing the air within the arc sleeve 6. During the air compression process, the elastic membrane 9 deforms. As the rotating plate 2 rotates, the third movable seat 20 follows the rotating plate. 2 rotate together, thereby driving the movable rod 17 to rotate, which in turn causes the moving rod 14 to move inward. As the moving rod 14 moves inward, the piston 15 moves inward at the same time, thereby compressing the air in the air cylinder 11. When the sector plate rotates past and no longer contacts the rotating shaft 5, the rotating plate 2 is not subjected to external force. The compressed gas in the arc sleeve 6 pushes the extrusion block 8 to reset, the elastic membrane 9 recovers, and the arc rod 7 resets and moves. At the same time, the compressed gas in the air cylinder 11 pushes the piston 15 outward, which in turn causes the moving rod 14 to move outward, thereby resetting the rotating plate 2, which facilitates subsequent flexible sealing.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flexible contact sealing device for an air preheater in a power plant boiler, comprising a mounting plate (1), characterized in that, A rotating plate (2) is rotatably connected to the upper end of the mounting plate (1). A lower slider (3) is provided on the upper side of the rotating plate (2). An upper slider (4) is fixedly connected to the lower slider (3) by screws. A rotating shaft (5) is provided at the top of the upper slider (4). A set of arc sleeves (6) is fixedly connected to the inner side wall of the mounting plate (1). A set of arc rods (7) matching the arc sleeves (6) is fixedly connected to the inner side wall of the rotating plate (2). The arc rods (7) extend from the rotating plate (2) into the interior of the arc sleeves (6) and are fixedly connected to a pressing block (8). A groove is provided in the pressing block (8), and an elastic membrane (9) is fixedly connected to the outer end of the groove. A bearing plate (10) is fixedly connected to the inner side wall of the mounting plate (1). An air cylinder (11) is provided on the upper surface of the bearing plate (10). A partition plate (12) is fixedly connected to the center of the air cylinder (11). Guide frames (13) are provided at both ends of the air cylinder (11). A moving rod (14) is slidably connected inside the guide frame (13). A piston (15) is fixedly connected to one end of the moving rod (14) inside the air cylinder (11). A first movable seat (16) is fixedly connected to the outer end of the moving rod (14). A movable rod (17) is rotatably connected inside the first movable seat (16). A second movable seat (18) is rotatably connected to the end of the movable rod (17) away from the first movable seat (16). A connecting block (19) is fixedly connected to the upper surface of the second movable seat (18). A third movable seat (20) is rotatably connected to the outside of the connecting block (19). The upper surface of the third movable seat (20) is fixedly connected to the side wall of the rotating plate (2).

2. The flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, The two ends of the rotating shaft (5) are rotatably connected to rotating sleeves (21), and a fixing rod (22) is fixedly connected to the outer wall of the bottom end of the rotating sleeve (21). The fixing rod (22) is fixedly connected to the upper slider (4) by screws.

3. The flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, The upper slider (4) has a placement groove that matches the rotating shaft (5), and the inclined surface of the upper slider (4) and the outer surface of the rotating shaft (5) are both coated with a metal ceramic coating.

4. The flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, The upper end face of the lower slider (3) is provided with a slot, and a block (23) is provided in the slot. The upper end face of the block (23) is fixedly connected to the lower end face of the upper slider (4).

5. A flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, The lower slider (3) is provided with a limiting frame (24) on its outer side, and the limiting frame (24) is fixedly connected to the outer peripheral side wall of the rotating plate (2). The limiting frame (24) is fixedly connected to the lower slider (3) by screws.

6. A flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, Two clamps (25) are symmetrically provided on the air cylinder (11), and the two clamps (25) are fixedly connected to the bearing plate (10) by bolts respectively.

7. A flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, A baffle (26) is provided on the outer side of the rotating part of the mounting plate (1) and the rotating plate (2), and the baffle (26) is fixedly connected to the mounting plate (1) by screws.

8. A flexible contact sealing device for a power plant boiler air preheater according to claim 1, characterized in that, The mounting plate (1) has a set of mounting holes evenly distributed at the bottom end, and each mounting hole is provided with a mounting bolt (27), and each mounting bolt (27) is threaded with a nut (28).

9. A flexible contact sealing device for an air preheater in a power plant boiler according to claim 1, characterized in that, The mounting plate (1) is mounted on the radial rotor grid plate of the air preheater.

10. A sealing method for a flexible contact sealing device for an air preheater in a power plant boiler according to any one of claims 1-9, characterized in that, Includes the following steps: S1: First, install the mounting plate (1) on the radial rotor grid plate using the mounting bolt (27) and nut (28); S2: As the mounting plate (1) rotates with the partition plate, the upper slider (4) first contacts the sector plate, causing the rotating plate (2) to rotate, so that the rotating shaft (5) abuts against the sector plate. As the rotating plate (2) rotates, the arc rod (7) rotates. The arc rod (7) drives the extrusion block (8) to move inside the arc sleeve (6), thereby extruding the air inside the arc sleeve (6). During the process of compressing the air, the elastic membrane (9) deforms. S3: While the rotating plate (2) is rotating, the third movable seat (20) rotates together with the rotating plate (2), thereby driving the movable rod (17) to rotate, and then causing the moving rod (14) to move inward at the same time. While the moving rod (14) moves inward, the piston (15) moves inward at the same time, thereby compressing the air in the air cylinder (11). S4: When the sector plate rotates and does not collide with the rotating shaft (5), the rotating plate (2) is not subjected to external force. The compressed gas in the arc sleeve (6) pushes the extrusion block (8) to reset, the elastic membrane (9) recovers, and the arc rod (7) resets and moves. At the same time, the compressed gas in the air cylinder (11) pushes the piston (15) to move outward, and the moving rod (14) moves outward at the same time, so that the rotating plate (2) is reset, which facilitates subsequent flexible sealing.

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