Self-adaptive radial sealing device of air pre-heater

Abstract

The utility model provides a self-adaptive radial sealing device for an air pre-heater. The self-adaptive radial sealing device comprises a sealing strip, a rotor follow-up adjusting plate and a pressing mechanism, wherein one end of the sealing strip is connected to the side wall of a center cylinder of the air pre-heater; the rotor follow-up adjusting plate is connected to the other end of the sealing strip; the sealing strip is connected with the side wall of the central cylinder through a hinge; one end of the rotor follow-up adjusting plate is connected with the sealing strip through a pin shaft, and the other end of the rotor follow-up adjusting plate is fixedly connected to the radial partition plate. According to the self-adaptive radial sealing device of the air pre-heater, the rotor follow-up adjusting plate and the sealing strip are connected through the pin shaft, so that the rotor follow-up adjusting plate can adjust the position of the sealing strip in a self-adaptive mode according to the deformation sinking degree of the rotor, and the sealing strip is fixed to the proper position all the time; therefore, the radial air leakage area of the hot end of the air pre-heater is kept at a low level, and the air leakage rate of the air pre-heater of a unit under the full-load working condition is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of air preheaters, and particularly to an air preheater self - adaptive radial sealing device. Background Art

[0002] A rotary air preheater is a heat exchange device that uses the hot flue gas discharged from the tail of a coal - fired boiler in a thermal power plant to heat cold air through a metal heating surface and then inputs the heated cold air into the boiler for combustion support.

[0003] Due to the different temperatures at the hot and cold ends during the operation of the rotary air preheater, the thermal expansion amounts of the metal heating surfaces in the preheater structure are also different, which in turn causes the rotor to undergo a mushroom - shaped deformation, increasing the radial sealing gap between the sector plate and the rotor, resulting in a relatively high air leakage rate of the rotary air preheater and a low thermal efficiency of the boiler.

[0004] Currently, the compensation methods for the radial sealing gap between the sector plate and the rotor include a fixed sealing method and a flexible sealing method. However, the fixed sealing method cannot effectively control the air leakage rate of the rotary air preheater under the condition of deep peak shaving of the unit, and the flexible sealing method needs to be in contact with the sealing surface of the sector plate, which easily causes serious wear of the sector plate and has low practicability. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide an air preheater self - adaptive radial sealing device, which can keep the radial air leakage area at the hot end of the air preheater at a relatively low level and effectively reduce the air leakage rate of the air preheater under the condition of deep peak shaving of the unit.

[0006] This application is achieved through the following technical solutions, specifically:

[0007] An air preheater self - adaptive radial sealing device includes: a sealing strip with one end connected to the side wall of the central cylinder of the air preheater, a rotor follower adjustment plate connected to the other end of the sealing strip, and a pressing mechanism connecting the sealing strip and the radial partition plate of the air preheater; the sealing strip is hinged to the side wall of the central cylinder; one end of the rotor follower adjustment plate is connected to the sealing strip through a pin shaft, and the other end is fixedly connected to the radial partition plate.

[0008] In this solution, by installing a sealing strip connected to the side wall of the central cylinder by a hinge in the radial partition bin at the hot end of the air preheater, the sealing strip can move up and down along the radial partition plate while maintaining a fixed connection. And by setting a rotor follower adjustment plate with one end welded and fixed to the radial partition plate and the other end connected to the sealing strip through a pin shaft, the rotor follower adjustment plate can adjust its position accordingly as the rotor is heated and deformed. When the rotor undergoes a mushroom-shaped deformation, one end of the rotor follower adjustment plate connected to the radial partition bin deforms downward with the rotor bin, while the other end connected to the sealing strip raises the sealing strip through the pin shaft, thereby keeping the relative position of the sealing strip and the sector plate stable, effectively preventing the increase in the air leakage rate caused by the increase in the sealing gap between the rotor and the sector plate due to rotor deformation.

[0009] As an improvement to the sealing strip in this application, in order to enable the sealing strip to move up and down along the radial partition plate, a plurality of waist-shaped holes are evenly arranged on the sealing strip, and the pressing mechanism passes through the waist-shaped holes and is connected to the radial partition plate, and the number of the pressing mechanisms corresponds to the number of the waist-shaped holes.

[0010] As an improvement to the pressing mechanism in this application, in order to ensure the pressing effect of the sealing strip, the pressing mechanism includes a bolt, a spring sleeved on the bolt, and a gasket connected to the lower part of the bolt.

[0011] As an improvement to the solution of this application, the rotor follower adjustment plate is connected to one end of the radial partition plate far from the central cylinder through a fixing member.

[0012] Further, on the basis of the above improvement, the fixing member connects the rotor follower adjustment plate and the radial partition plate by means of bolt connection, welding or riveting.

[0013] As an improvement to the solution of this application, the air preheater self-adaptive radial sealing device further includes a sealing strip fixing plate fixedly connected to the side wall of the central cylinder, and the hinge is installed on the plate surface of the sealing strip fixing plate.

[0014] As an improvement to the solution of this application, the air preheater self-adaptive radial sealing device further includes a sector plate connected to the central cylinder, the sector plate is located above the sealing strip and there is a gap between the sector plate and the sealing strip.

[0015] The beneficial effects of this application are as follows:

[0016] The solution of this application installs a sealing strip connected to the side wall of the central cylinder by a hinge in the hot-end radial compartment of the air preheater, enabling the sealing strip to have the ability to move up and down along the radial compartment plate while maintaining a fixed connection. By setting a rotor follower adjustment plate with one end welded and fixed to the radial compartment plate and the other end connected to the sealing strip through a pin shaft, the rotor follower adjustment plate can adjust its position accordingly as the rotor is heated and deformed. When the rotor undergoes a mushroom-shaped deformation, one end of the rotor follower adjustment plate connected to the radial compartment plate deforms downward with the rotor compartment, while the other end connected to the sealing strip raises the sealing strip through the pin shaft, thereby maintaining the relative stability of the position between the sealing strip and the sector plate, effectively preventing the increase in the air leakage rate caused by the increase in the sealing gap between the rotor and the sector plate due to rotor deformation.

[0017] In addition to the technical problems solved by the present utility model, the technical features constituting the technical solution, and the advantages brought by these technical features of the technical solution described above, other technical problems that the present utility model can solve, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of an air preheater adaptive radial sealing device in an embodiment of this application.

[0019] Description of the reference numerals:

[0020] 1. Central cylinder; 2. Sealing strip; 3. Rotor follower adjustment plate; 4. Radial compartment plate; 5. Compression mechanism; 6. Hinge; 7. Pin shaft; 8. Fixing piece; 9. Sealing strip fixing plate; 10. Sector plate. Detailed Embodiment

[0021] The following will be combined with the attached Figure 1 The embodiments of the technical solution of this application will be described in detail. The following embodiments are only used to illustrate the technical solution of this application more clearly, so they are only examples and cannot be used to limit the protection scope of this application. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] In response to the problems existing in the prior art in the background art, the embodiment of this application provides an air preheater adaptive radial sealing device, such as Figure 1Schematically shows a structural schematic diagram of the air preheater adaptive radial seal device of the present application. The air preheater adaptive radial seal device includes: a sealing strip 2 with one end connected to the side wall of the central cylinder 1 of the air preheater, a rotor follower adjusting plate 3 connected to the other end of the sealing strip 2, and a pressing mechanism 5 connecting the sealing strip 2 and the radial partition plate 4 of the air preheater; the sealing strip 2 is connected to the side wall of the central cylinder 1 through a hinge 6; one end of the rotor follower adjusting plate 3 is connected to the sealing strip 2 through a pin shaft 7, and the other end is fixedly connected to the radial partition plate 4.

[0023] Specifically, in this embodiment, one end of the sealing strip 2 is flexibly connected to the side wall of the central cylinder 1 of the air preheater through a hinge 6. This connection method allows the sealing strip 2 to move up and down along a certain trajectory while maintaining the connection with the side wall of the central cylinder 1. The pressing mechanism 5 firmly presses the sealing strip 2 on the radial partition plate 4 through a segmented pressing method, thereby ensuring the reliability of the seal. The other end of the rotor follower adjusting plate 3 can be firmly connected to the radial partition plate 4 by welding or other fixing methods to ensure that it can move together with the radial partition plate 4 when the rotor deforms. During the operation of the air preheater, when the rotor of the air preheater is heated and undergoes a mushroom-shaped deformation, the radial partition plate 4 will deform downward accordingly. At this time, one end of the rotor follower adjusting plate 3 will move downward together with the radial partition plate 4, and the other end of the rotor follower adjusting plate 3 will lift the sealing strip 2 upward through the pin shaft 7. Since the sealing strip 2 is connected to the side wall of the central cylinder 1 through a hinge 6, the sealing strip 2 can move up and down along the trajectory of the hinge 6 while maintaining a certain tension. In this way, even if the rotor deforms, the sealing strip 2 can always closely adhere to the radial partition plate 4, so as to keep the radial air leakage area constant within a fixed numerical range, effectively reducing the air leakage rate of the air preheater. Exemplarily, the length range of the rotor follower adjusting plate 3 is between 1 and 1.5 meters, and the length of the connection between one end of the rotor follower adjusting plate 3 and the radial partition plate 4 is between 100 and 150 millimeters.

[0024] In one implementation, the air preheater adaptive radial seal device further includes a sector plate 10 connected to the central cylinder 1, the sector plate 10 is located above the sealing strip 2 and there is a gap between the sector plate 10 and the sealing strip 2.

[0025] Specifically, leaving a minimum reasonable gap between the sector plate 10 and the sealing strip 2 can not only ensure that the sealing strip 2 has enough space for adaptive adjustment when subjected to rotor deformation or thermal expansion, but also avoid direct contact between the sector plate 10 and the sealing strip 2, thereby reducing friction and wear and extending the service life of the air preheater.

[0026] It should be understood that the sealing strip 2 can move up and down around the hinge 6. Therefore, directly connecting the gasket 2 to the hinge 6 may cause severe wear of the gasket 2 during the movement. To ensure the reliability of the gasket 2, in one implementation, the air preheater adaptive radial sealing device further includes a sealing strip fixing plate 9 fixedly connected to the side wall of the central cylinder 1, and the hinge 6 is installed on the plate surface of the sealing strip fixing plate 9. In this embodiment, the reliable connection among the central cylinder 1, the hinge 6, and the gasket 2 is realized through the sealing strip fixing plate 9.

[0027] Based on the previous embodiment, to realize segmentally pressing the sealing strip 2 against the radial partition plate 4, in one implementation, a plurality of kidney-shaped holes are uniformly arranged on the sealing strip 2, and the pressing mechanism 5 passes through the kidney-shaped holes and is connected to the radial partition plate 4. The number of the pressing mechanisms 5 corresponds to the number of the kidney-shaped holes.

[0028] Specifically, the kidney-shaped holes are arranged at equal intervals along the length direction of the sealing strip 2 to ensure that the sealing strip 2 can be uniformly stressed in the length direction, so as to achieve the best sealing performance. The design of the kidney-shaped holes allows the pressing mechanism 5 to keep pressing the sealing strip 2 while allowing the sealing strip 2 to be finely adjusted along the length direction of the kidney-shaped holes when affected by the deformation of the rotor.

[0029] Based on the previous embodiment, to ensure the sealing effect of the sealing strip 2 on the radial partition plate 4, in one implementation, the pressing mechanism 5 includes a bolt, a spring sleeved on the bolt, and a gasket connected to the lower part of the bolt. Specifically, by rotating the bolt of the pressing mechanism 5 to compress the spring, the pressing mechanism 5 applies a certain pressing force to the sealing strip 2 to achieve the effect of close fitting.

[0030] In one implementation, the rotor follower adjusting plate 3 is connected to one end of the radial partition plate 4 away from the central cylinder 1 through a fixing member 8.

[0031] Specifically, in a rotary air preheater, the outer peripheral part of the rotor will bear a higher temperature, while the part near the axis has a lower temperature. This temperature difference causes non-uniform thermal expansion in different regions of the rotor, resulting in greater thermal stress in the outer peripheral part. And during the rotation of the rotor, the outer peripheral part far from the axis is subjected to a greater centrifugal force, which exacerbates the deformation of the outer peripheral part. Therefore, fixedly connecting the rotor follower adjusting plate 3 to one end of the radial partition plate 4 away from the central cylinder 1 can more accurately sense the deformation of the rotor.

[0032] Further, on the basis of the previous embodiment, the fixing member 8 connects the rotor follower adjusting plate 3 and the radial partition plate 4 by means of bolts, welding or riveting. Specifically, the above connection method can be comprehensively considered according to various factors such as the actual working environment and working conditions requirements, as well as material characteristics and cost considerations. This embodiment does not make any restrictions.

[0033] In the description of the embodiments of the present application, unless otherwise clearly specified and defined, technical terms such as "arranged", "provided with", "connected", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air preheater adaptive radial sealing device, characterized in that: include: A sealing strip (2) having one end connected to the side wall of a central tube (1) of an air preheater, a rotor follower adjustment plate (3) connected to the other end of the sealing strip (2), and a pressing mechanism (5) connecting the sealing strip (2) and a radial partition plate (4) of the air preheater; The sealing strip (2) is connected to the side wall of the central tube (1) via a hinge (6); One end of the rotor follower adjustment plate (3) is connected to the sealing strip (2) via a pin shaft (7), and the other end is fixedly connected to the radial partition plate (4).

2. The adaptive radial sealing device according to claim 1, characterized in that: The sealing strip (2) is evenly provided with a plurality of waist-shaped holes, and the clamping mechanism (5) passes through the waist-shaped holes and is connected to the radial partition plate (4), and the number of the clamping mechanism (5) corresponds to the number of the waist-shaped holes.

3. The adaptive radial sealing device according to claim 1 or 2, characterized in that: The clamping mechanism (5) comprises a bolt, a spring sleeved on the bolt, and a gasket connected to the lower part of the bolt.

4. The air preheater adaptive radial sealing device according to claim 1, characterized in that: The rotor follower adjustment plate (3) is connected to an end of the radial partition plate (4) away from the central tube (1) via a fixing member (8).

5. The air preheater adaptive radial sealing device according to claim 4, characterized in that: The fixing member (8) is connected to the rotor follower adjustment plate (3) and the radial partition plate (4) by means of bolts, welding or riveting.

6. The air preheater adaptive radial sealing device according to claim 1, characterized in that: It also includes a sealing strip fixing plate (9) fixedly connected to the side wall of the central tube (1), and the hinge (6) is installed on the plate surface of the sealing strip fixing plate (9).

7. The air preheater adaptive radial sealing device according to claim 1, characterized in that: Also includes: A fan-shaped plate (10) is connected to the central tube (1), wherein the fan-shaped plate (10) is located above the sealing strip (2) and a gap is provided between the fan-shaped plate (10) and the sealing strip (2).

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