Self-adjusting sealing device for air preheater of boiler

Abstract

The present application relates to rotary air preheater sealing device technical field, specifically to a kind of self-adjusting boiler air preheater sealing device, including fixed component, first elastic support component, self-rotating sealing component and second elastic support component, fixed component is fixedly connected with radial bulkhead and both form a cavity, first elastic support component is located in the cavity;Self-rotating sealing component is rotatably arranged on first elastic support component by limiting component, second elastic support component is fixed on the side of first elastic support component, and the upper end of second elastic support component is fixedly abutted to the side of self-rotating sealing component.The present application is combined by using self-rotating sealing component and two groups of elastic support components, two groups of elastic support components are used according to sealing stress condition, and self-rotating sealing component and fan-shaped plate of air preheater are well sealed by using elasticity, effectively reduce the air leakage rate of rotary air preheater, reduce operating power consumption, improve boiler thermal efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to rotary air preheater sealing device technical field, specifically relates to a self-adjusting boiler air preheater sealing device. BACKGROUND

[0002] The sealing technology of the rotary air preheater of the thermal power boiler is endless, and its main purpose is to reduce the air leakage rate of the air preheater: one is to reduce the leakage flow contact between the internal heat exchange medium and the atmosphere outside the body, and the other is to reduce the leakage flow between the internal heat exchange gas. At present, the sealing methods of the rotary air preheater of the thermal power boiler mainly include hard contact mechanical seal, brush seal, and hinge type spring flexible seal. Among them, the mechanical seal is severely worn and has a short service life and needs to be replaced frequently; the brush seal has a short service life and the steel wire is easy to change, which is damaged quickly; the hinge type spring flexible seal occupies a large area of the rotor, which affects the heat exchange efficiency, and the hinge is easy to damage the spring with a limited service life. Other similar spring leaf type flexible seals derived from the hinge type spring flexible seal also have the same defects. SUMMARY

[0003] The purpose of the present application is to solve the above problems, and provide a self-adjusting boiler air preheater sealing device. The sealing device is combined with a self-rotating sealing assembly and two sets of elastic support assemblies. The two sets of elastic support assemblies are used in combination according to the sealing stress condition, and the self-rotating sealing assembly is well sealed with the fan-shaped plate of the air preheater by using elasticity, which effectively reduces the air leakage rate of the rotary air preheater, reduces the operation power consumption, and improves the thermal efficiency of the boiler.

[0004] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0005] A self-adjusting boiler air preheater sealing device is applied to a boiler air preheater, wherein the boiler air preheater has a radial partition plate, and the sealing device comprises

[0006] A fixed component is fixedly connected with the radial partition plate and forms a cavity with the radial partition plate;

[0007] A first elastic support assembly is arranged on the cavity;

[0008] A self-rotating sealing assembly comprises a self-rotating part and a sealing assembly fixedly arranged on the self-rotating part, the self-rotating part is rotatably arranged on the first elastic support assembly through a limiting component, one end of the limiting component penetrates through the self-rotating part and is fixedly arranged in the first elastic support assembly, and the gap between the self-rotating part and the first elastic support assembly can be adjusted through the limiting component; the sealing assembly is used for contacting with the fan-shaped sealing plate of the air preheater; and

[0009] A second elastic support assembly is fixed to one side of the first elastic support assembly, and an upper end of the second elastic support assembly is fixed to abut against one side of the self-rotating member.

[0010] Further, the fixing assembly comprises a bottom sealing plate and a fixing plate, one side of the bottom sealing plate is fixedly connected with a bottom end of the radial partition plate, and one end of the fixing plate is fixed to one end of the bottom sealing plate, so that the radial partition plate, the bottom sealing plate and the fixing plate form a fixed structure with a cavity.

[0011] Further, the fixing assembly comprises a bottom sealing plate and a fixing plate, one side of the bottom sealing plate is fixedly connected with a bottom end of the radial partition plate, and one end of the fixing plate is fixed to one end of the bottom sealing plate, so that the radial partition plate, the bottom sealing plate and the fixing plate form a fixed structure with a cavity.

[0012] Further, the first elastic support assembly comprises a support rod, a second vertical support plate, a cylinder and a second spring, the support rod is arranged in the cavity, and one end of the support rod is fixedly connected with the second vertical support plate, the second vertical support plate extends out of the cavity from an end away from the support rod and is fixedly connected with the cylinder, and the support rod extends through the bottom sealing plate from an end away from the second vertical support plate and is threadedly connected with a gasket and a nut for limiting.

[0013] Further, the sealing assembly comprises a vertical sealing plate and an inclined sealing gasket arranged on the vertical sealing plate, a lower end of the vertical sealing plate is fixedly arranged on the self-rotating member, and the inclined sealing gasket is used to contact a fan-shaped sealing plate of the air preheater.

[0014] Further, the second elastic support assembly comprises a horizontal support plate arranged on one side of the cylinder, the horizontal support plate is provided with a third spring, and an end of the third spring away from the horizontal support plate abuts against the self-rotating member.

[0015] Further, a strip-shaped hole is arranged on the self-rotating member, the limiting assembly comprises a limiting screw and a first limiting nut, the self-rotating member is connected with the cylinder through the limiting screw arranged in the strip-shaped hole, and the first limiting nut is rotatably arranged on an end of the limiting screw exposed from the self-rotating member, and the size of the gap between the self-rotating member and the cylinder can be adjusted by rotating the first limiting nut.

[0016] Further, a groove is further formed below the strip-shaped hole on the cylinder, the length of the groove is less than the length of the strip-shaped hole, and a scraper plate is further arranged on the bottom end of the self-rotating part and extends into the groove.

[0017] Further, a containing groove is further formed on one side of the self-rotating part for containing the third spring, the containing groove is formed on the side of the self-rotating part close to the cylinder, and a positioning groove is further formed on the top of the containing groove on the transverse support plate and the self-rotating part to fix the end of the third spring in the positioning groove.

[0018] Further, the length of the vertical sealing plate is the same as the length of the self-rotating part.

[0019] By adopting the above technical scheme, the present application has the following beneficial effects:

[0020] The first elastic support assembly and the second elastic support assembly are sequentially pressed by the friction force and the pressure, the self-rotating sealing assembly is rotated counterclockwise to recover after the rotary air preheater runs away from the fan-shaped sealing plate, and one-time sealing is finally completed. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of a self-adjusting boiler air preheater sealing device according to Embodiment 1 of the present application.

[0022] Figure 2 It is a side view of a first elastic support assembly in a self-adjusting boiler air preheater sealing device according to Embodiment 1 of the present application.

[0023] Figure 3 It is a front view of a self-adjusting boiler air preheater sealing device according to Embodiment 2 of the present application.

[0024] Figure 4It is a side view of the first elastic support assembly in the self-adjusting boiler air preheater sealing device of the embodiment 2 of the present application.

[0025] Figure 5 It is a front view of the self-rotating sealing assembly in the self-adjusting boiler air preheater sealing device of the present application.

[0026] Figure 6 It is a top view of the self-rotating sealing assembly in the self-adjusting boiler air preheater sealing device of the present application.

[0027] Figure 7 It is a front view of the cylinder in the self-adjusting boiler air preheater sealing device of the present application.

[0028] Figure 8 It is a top view of the cylinder in the self-adjusting boiler air preheater sealing device of the present application.

[0029] The reference signs in the drawings are as follows: 1-radial partition, 2-fixed assembly, 21-bottom sealing plate, 22-fixed plate, 23-fixed bolt, 3-first elastic support assembly, 31-first spring, 32-first vertical support plate, 321-bar-shaped hole, 33-cylinder, 331-groove, 34-supporting rod, 35-second vertical support plate, 36-second spring, 37-gasket, 38-nut, 4-self-rotating sealing assembly, 41-self-rotating part, 411-bar-shaped hole, 412-limiting screw, 413-first limiting nut, 414-housing groove, 42-vertical sealing plate, 43-inclined sealing gasket, 44-scraping plate, 5-second elastic support assembly, 51-horizontal support plate, 52-third spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] It should be noted that when a component is referred to as being “fixed to” another component, it can be directly on the other component or there can be a middle component. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there can be a middle component. When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there can be a middle component. The terms “vertical”, “horizontal”, “left”, “right” and similar expressions used herein are for illustrative purposes only.

[0032] EMBODIMENT

[0033] See Figure 1 , Figure 2 , Figures 5 to 8 The utility model provides a self -adjusting boiler air preheater sealing device for boiler air preheater, boiler air preheater has radial baffle 1, the sealing device includes fixed assembly 2, first elastic support assembly 3, self -rotating sealing assembly 4 and second elastic support assembly 5.

[0034] Fixed assembly 2 is fixedly connected with radial baffle 1 and forms a cavity with radial baffle 1, and first elastic support assembly 3 is arranged on the cavity;Self-rotating sealing assembly 4 includes self-rotating part 41 and sealing assembly fixed on self-rotating part 41, self-rotating part 41 is rotatably arranged on first elastic support assembly 3 through limiting assembly, one end of limiting assembly passes through self-rotating part 41 and is fixed in first elastic support assembly 3, and the gap between self-rotating part 41 and first elastic support assembly 3 can be adjusted through limiting assembly;The utility model combines the actual situation, considers that the radial baffle 1 of air preheater will be heat expanded and deformed, therefore sets up limiting assembly to adjust the gap between self-rotating part 41 and support assembly 3, so that the spacing between self-rotating sealing assembly 4 and air preheater sector plate is adjustable, prevents the heat expansion deformation of radial baffle 1 after self-rotating sealing assembly 4 and air preheater sector plate interference contact, causes air preheater sector plate and sealing assembly to be easily damaged, air preheater rotates and is jammed, abnormal sound, operating current rises.Sealing assembly is used to contact with the sector sealing plate of air preheater.Second elastic support assembly 5 is fixed on one side of first elastic support assembly 3, and the upper end of second elastic support assembly 5 is fixedly abutted on one side of self-rotating part 41.

[0035] In the embodiment, the fixed assembly 2 specifically includes a bottom sealing plate 21 and a fixed plate 22, one side of the bottom sealing plate 21 is fixedly connected with the radial baffle 1, the bottom end of the fixed plate 22 is fixed on one end of the bottom sealing plate 21, and the fixed plate 22 and the radial baffle 1 are further fixedly connected through a fixed bolt 23, so that the radial baffle 1, the bottom sealing plate 21, the fixed plate 22 and the fixed bolt 23 form a fixed structure with a cavity. This fixed assembly 2 not only can be used for fixedly connecting with the radial baffle 1 of the air preheater, but also provides a stable installation cavity for the installation of the first elastic support assembly 3, so that the structure of the present application is stable and the installation is convenient.

[0036] The first elastic support assembly 3 includes a first spring 31, a first vertical support plate 32 and a cylinder 33, the first spring 31 is arranged in the cavity, one end of the first spring 31 is fixed on the bottom sealing plate 21, one end of the first vertical support plate 32 is fixedly supported on the end of the first spring 31 away from the bottom sealing plate 21, the end of the first vertical support plate 32 away from the first spring 31 extends out of the cavity and is fixedly connected with the cylinder 33, and the self-rotating part 41 is rotatably arranged on the cylinder 33 through the limiting assembly.

[0037] More specifically, in this embodiment, such as Figure 2 As shown, the side of the first vertical support plate 32 has two rows of strip holes 321 arranged from top to bottom. Each row of strip holes includes three spaced-apart strip holes 321. The strip holes 321 not only allow the fixing bolts 23 to pass through, but also facilitate the vertical movement of the first vertical support plate 32, so that the first vertical support plate 32 and the cylinder 33 can move downwards to compress the first spring 31. Specifically, the cylinder 33 is cylindrical in shape, and the length of the first vertical support plate 32 is the same as the length of the cylinder 33. Correspondingly, in order to provide better elastic support, multiple first springs 31 are provided. In this embodiment, three are provided. The three first springs 31 are spaced apart at the bottom of the first vertical support plate 32, and the fixing bolts 23 in the bottom row are fixedly inserted between two pairs of first springs 31.

[0038] The first elastic support component 3 is used to elastically support the self-rotating sealing component 4, and a second elastic support component 5 is provided on one side of it, which can be connected to the self-rotating sealing component 4. This allows the self-rotating sealing component 4 to elastically contact the fan-shaped sealing plate of the air preheater under the combined action of the first elastic support component 3 and the second elastic support component 5, thereby achieving an elastic seal. Accordingly, the self-rotating component 41 used in this embodiment is a semi-circular plate, which allows the self-rotating component 41 to be better supported and fixed on the cylinder 33 and to rotate smoothly.

[0039] As a further specific technical solution, the sealing assembly includes a vertical sealing plate 42 and an inclined sealing gasket 43 disposed on the vertical sealing plate 42. The lower end of the vertical sealing plate 42 is fixed to the self-rotating component 41, and the inclined sealing gasket 43 is used to contact the sector-shaped sealing plate of the air preheater. In use, when the inclined sealing gasket 43 makes interference contact with the sector-shaped sealing plate of the air preheater, it is subjected to friction and pressure. The friction and pressure then drive the self-rotating component 41 to rotate to the right through the vertical sealing plate 42. Therefore, the vertical sealing plate 42 plays a role in force transmission during the sealing process.

[0040] The second elastic support component 5 includes a transverse support plate 51 disposed on one side of the cylinder 33. A third spring 52 is provided on the transverse support plate 51, and the end of the third spring 52 away from the transverse support plate 51 abuts against the self-rotating component 41. In this embodiment, the transverse support plate 51 is triangular in shape, and one side of the transverse support plate 51 is fixedly connected to the cylinder 33. By setting the second elastic support component 5, the self-rotating component 41 of the self-rotating sealing component 4 can return to its original position under the elastic force of the third spring 52 after rotation, thus ensuring the elastic seal. Moreover, the second elastic support component 5 occupies little space, making the structure of the present invention reasonable and the installation and operation convenient.

[0041] When the inclined sealing gasket 43 contacts the sector sealing plate of the air preheater, the inclined sealing gasket 43 is subjected to the friction force to the right and the pressure downward, and the inclined sealing gasket 43 further transmits the force to the self-rotating part 41 through the vertical sealing plate 42, the self-rotating part 41 rotates to the direction of the third spring 52 and exerts force to the third spring 52, so that the third spring 52 is compressed to the limit, and the force on the self-rotating part 41 continues to be transmitted downward to the cylinder 33 and the first vertical support plate 32, so that the cylinder 33 and the first vertical support plate 32 move downward, at this time the first spring 31 is compressed, and when the rotating air preheater runs away from the sector sealing plate, the third spring 52 resets, the first spring 31 resets, the cylinder 33 and the first vertical support plate 32 move upward, and one sealing is completed.

[0042] As a further specific technical solution, the material of the vertical sealing plate 42 and the inclined sealing gasket 43 is carbon steel or molybdenum disulfide composite material. Both carbon steel and molybdenum disulfide composite material are high-temperature-resistant and less-deformable materials, so that the vertical sealing plate 42 and the inclined sealing gasket 43 have good sealing effect and long service life.

[0043] As a further specific technical solution, a strip-shaped hole 411 is formed on the self-rotating part 41, so that the self-rotating part 41 can rotate along the outer surface of the cylinder 33 to adjust the sealing angle and the contact area. The limiting assembly includes a limiting screw 412 and a first limiting nut 413, the self-rotating part 41 is connected with the cylinder 33 through the limiting screw 412 penetrating the strip-shaped hole 411, and the first limiting nut 413 is rotatably arranged at one end of the limiting screw 412 exposed from the self-rotating part 41. By rotating the first limiting nut 413, the gap between the self-rotating part 41 and the cylinder 33 can be adjusted, and then the distance between the inclined sealing gasket 43 and the sector plate of the air preheater is adjusted. The limiting pin 412 protects the self-rotating part 41 from rotating off. Through the adjustment of the limiting assembly, the present application can fully cope with the thermal expansion deformation of the radial partition plate 1 of the air preheater, and the influence of the deformation on the sealing effect and the service life is avoided.

[0044] As a further specific technical solution, the cylinder 33 is further provided with a groove 331 below the strip-shaped hole 411, the length of the groove 331 is less than the length of the strip-shaped hole 411, so that the ash in the air preheater can fall into the groove 331, preventing the ash from accumulating in the strip-shaped hole 411 and affecting the rotation of the self-rotating part 41. Since hot air flows in the air preheater, the ash falling into the groove 331 can be blown away by the hot air in the air preheater. Further, in order to prevent the hot air in the air preheater from not being able to completely blow out the ash in the groove 331, causing dust to accumulate in the groove 331 after a long time, the bottom end of the self-rotating part 41 is further provided with a scraper 44 that can extend into the groove 331 on the side away from the limit pin 412 of the strip-shaped hole 411. Through the arrangement of the scraper 44, the scraper 44 also moves during the rotation of the self-rotating part 41, thereby loosening the ash accumulated in the groove 331, facilitating the hot air in the air preheater to blow it out, and preventing the ash from accumulating in the groove 331 and affecting the smooth rotation of the self-rotating part 41.

[0045] Of course, in other embodiments, a sealing cover can also be provided on the strip-shaped hole 411 to prevent ash from entering the strip-shaped hole 411.

[0046] As a further specific technical solution, the self-rotating part 41 is further provided with a containing groove 414 for containing the third spring 52, the containing groove 414 is provided on the side of the self-rotating part 41 abutting the cylinder 33, and the transverse support plate 51 and the self-rotating part 41 are both provided with a positioning groove (not shown) on the top of the containing groove 414, so as to fix the end of the third spring 52 in the positioning groove.

[0047] In this embodiment, the length of the vertical sealing plate 42 is the same as the length of the self-rotating part 41. Since the vertical sealing plate 42 plays a role in force transmission, the same length makes the contact area between the vertical sealing plate 42 and the self-rotating part 41 larger, and the force transmission effect better, thereby enabling the vertical sealing plate 42 to drive the self-rotating part 41 to rotate faster and better.

[0048] Embodiment 2

[0049] In this embodiment, the structure of the first elastic support assembly 3 is different from that of embodiment 1, and the other parts are the same as those of embodiment 1.

[0050] In this embodiment, please refer to Figure 3 and Figure 4The first elastic support assembly 3 comprises a support rod 34, a second vertical support plate 35, a cylinder 33 and a second spring 36. The support rod 34 is arranged in the cavity and one end of the support rod 34 is fixedly connected with the second vertical support plate 35. The second vertical support plate 35 extends out of the cavity from the end away from the support rod 34 and is fixedly connected with the cylinder 33. The support rod 34 penetrates through the bottom sealing plate 21 from the end away from the second vertical support plate 35 and further threadedly connects with a gasket 37 and a nut 38 for limiting. The second spring 36 is sleeved on the support rod 34 and one end of the second spring 36 is fixed on the bottom sealing plate 21 and the other end abuts against the bottom of the second vertical support plate 35. The self-rotating part 41 is rotatably arranged on the cylinder 33 through the limiting assembly. Specifically, the side surface of the second vertical support plate 35 is also provided with a strip-shaped hole for the fixing bolt 23 to penetrate through and facilitate the second vertical support plate 35 to move up and down. In order to realize the stability of support, the support rod 34 for supporting the second vertical support plate 35 is provided with a plurality of support rods, three support rods in this embodiment. The three support rods 34 are arranged side by side and spaced apart at the bottom of the second vertical support plate 35. The second spring 36 is sleeved on each support rod 34 and the fixing bolt 23 is fixedly arranged between two support rods 34.

[0051] When the inclined sealing gasket 43 contacts the fan-shaped sealing plate of the air preheater, the inclined sealing gasket 43 is subjected to the friction force to the right and the pressure downward. The inclined sealing gasket 43 further transmits the force to the self-rotating part 41 through the vertical sealing plate 42. The self-rotating part 41 rotates to the direction of the third spring 52 and exerts force to the third spring 52 so that the third spring 52 is compressed to the limit. The force on the self-rotating part 41 is continuously transmitted downward to the cylinder 33, the second vertical support plate 35 and the support rod 34 so that the cylinder 33, the second vertical support plate 35 and the support rod 34 move downward as a whole. At this time, the second spring 36 is compressed. When the rotating air preheater runs away from the fan-shaped sealing plate, the third spring 52 is reset, the second spring 36 is reset, the cylinder 33, the second vertical support plate 35 and the support rod 34 move upward as a whole, and one-time sealing is completed.

[0052] The working principle of the present application is as follows: firstly, adjustment is carried out in the cold state when the furnace is not started, the first limiting nut 413 is rotated to move the self-rotating part 41 downward, that is, the gap between the self-rotating part 41 and the cylinder 33 is reduced, and then the distance between the inclined sealing gasket 43 and the air preheater sector plate is increased, so that the distance between the inclined sealing gasket 43 and the air preheater sector plate reaches a certain distance (the distance is obtained by combining the metal characteristics with the experience prediction, and the mushroom top deformation formed by the stress generated after the radial baffle is heated is also considered), which is generally about 1 cm. Since the sealing device of the present application is fixedly connected with the radial baffle 1 of the air preheater, when the radial baffle 1 is heated and deformed during normal operation, the radial baffle 1 will expand into an arch shape and will extend upward and outward, so that the sealing device of the present application is raised as a whole, and then the inclined sealing gasket 43 contacts the sector sealing plate of the air preheater. After the contact, the inclined sealing gasket 43 is subjected to a friction force to the right and a pressure downward, and the inclined sealing gasket 43 transmits the force to the self-rotating part 41 through the vertical sealing plate 42 to drive the self-rotating part 41 to rotate in the direction of the third spring 52 and apply a force to the third spring 52. When the third spring 52 is compressed to the limit, the force received by the self-rotating part 41 is continuously transmitted to the first spring 31 or the second spring 36 through the cylinder 33 and the vertical support plate, and the first spring 31 or the second spring 36 is compressed. When the rotary air preheater runs away from the sector sealing plate, the third spring 52 resets, the first spring 31 or the second spring 36 resets, and one sealing is completed. This process uses the elasticity of the first elastic support assembly 2 and the second elastic support assembly 5 to make the inclined sealing gasket 43 and the sector plate of the air preheater well sealed, avoids direct hard contact type mechanical sealing of the sealing plate and the sector plate of the air preheater, effectively reduces the air leakage rate of the rotary air preheater, reduces the operating power consumption, improves the thermal efficiency of the boiler, thereby reducing the coal consumption, saving the cost, improving the reliability and service life of the rotary air preheater.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

Claims

1. A self-adjusting boiler air preheater sealing device applied to a boiler air preheater, the boiler air preheater having a radial baffle plate therein, characterized in that: The sealing device comprises a fixing assembly fixedly connected with the radial partition plate and forming a cavity with the radial partition plate; a first elastic support assembly arranged on the cavity; a self-rotating sealing assembly comprising a self-rotating member and a sealing assembly fixedly arranged on the self-rotating member, the self-rotating member being rotatably arranged on the first elastic support assembly through a limiting assembly, one end of the limiting assembly penetrating through the self-rotating member and being fixedly arranged in the first elastic support assembly, the gap between the self-rotating member and the first elastic support assembly being adjustable through the limiting assembly, and the sealing assembly being used for contacting the fan-shaped sealing plate of the air preheater; and a second elastic support assembly fixedly arranged on one side of the first elastic support assembly and having an upper end fixedly abutting against one side of the self-rotating member; the first elastic support assembly comprising a first spring, a first vertical support plate and a cylinder, the first spring being arranged in the cavity and having one end fixedly arranged on the bottom sealing plate, one end of the first vertical support plate being fixedly supported on the end of the first spring away from the bottom sealing plate, the first vertical support plate extending out of the cavity at the end away from the first spring and being fixedly connected with the cylinder, and the self-rotating member being rotatably arranged on the cylinder through the limiting assembly; the sealing assembly comprising a vertical sealing plate and an inclined sealing gasket arranged on the vertical sealing plate, the lower end of the vertical sealing plate being fixedly arranged on the self-rotating member, and the inclined sealing gasket being used for contacting the fan-shaped sealing plate of the air preheater; the second elastic support assembly comprising a horizontal support plate arranged on one side of the cylinder, the horizontal support plate being provided with a third spring, and the third spring having an end away from the horizontal support plate abutting against the self-rotating member; the self-rotating member being provided with a strip-shaped hole, the limiting assembly comprising a limiting screw and a first limiting nut, the self-rotating member being connected with the cylinder through the limiting screw penetrating through the strip-shaped hole, the first limiting nut being rotatably arranged on the end of the limiting screw exposed from the self-rotating member, and the gap between the self-rotating member and the cylinder being adjustable by rotating the first limiting nut; the cylinder being further provided with a groove below the strip-shaped hole, the length of the groove being smaller than the length of the strip-shaped hole, and the bottom end of the self-rotating member being further provided with a scraper plate capable of extending into the groove on the side away from the limiting pin; 2. A self-adjusting seal for a boiler air preheater as claimed in claim 1, wherein: the fixing assembly comprising a bottom sealing plate and a fixing plate, one side of the bottom sealing plate being fixedly connected with the bottom end of the radial partition plate, and one end of the fixing plate being fixedly arranged on one end of the bottom sealing plate, so that the radial partition plate, the bottom sealing plate and the fixing plate form a fixing structure with the cavity.

3. A self-adjusting seal for a boiler air preheater as defined in claim 1, wherein: one side of the self-rotating member being further provided with a containing groove for containing the third spring, the containing groove being arranged on the side of the self-rotating member abutting against the cylinder, and the horizontal support plate and the self-rotating member being both provided with a positioning groove on the top of the containing groove, so that the end of the third spring is fixedly arranged in the positioning groove.

4. A self-adjusting seal for a boiler air preheater as defined in claim 1, wherein: the length of the vertical sealing plate being the same as the length of the self-rotating member.

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