Air pre-heater dynamic thermal compensation sealing device based on dual drive

Abstract

The utility model discloses a dual-drive-based dynamic thermal compensation sealing device for an air pre-heater. A driving plate and a sealing piece are jointly mounted on a radial partition plate at the hot end of a rotor of the air pre-heater through clamping bolts. The whole body is divided into a fixed section and a driving section, the clamping bolt located on the fixed section is completely fixed, and the clamping bolt located on the driving section is provided with movement allowance. The sealing base plate comprises an attaching section and a bending section, and the attaching section is arranged between the driving plate and the air pre-heater rotor hot end radial partition plate and arranged on the top of the air pre-heater rotor hot end radial partition plate in a tightly attached mode. And the wedge-shaped driving mechanism and the L-shaped driving amplifying mechanism are respectively arranged in the middle and at the tail end of the driving section. The wedge-shaped driving mechanism comprises a first wedge-shaped block and a second wedge-shaped block which are arranged on the driving plate and the sealing piece respectively. The L-shaped driving amplifying mechanism comprises a fixing plate and an L-shaped driving arm, wherein the two ends of the L-shaped driving arm are connected with the driving plate and the sealing piece respectively. The compensation amount and the triangular air leakage area are effectively complemented, effective dynamic compensation is achieved, operation is stable, and the air leakage rate is remarkably reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of rotary air preheater sealing, and in particular relates to a dynamic thermal compensation sealing device for an air preheater based on dual driving. Background Art

[0002] A rotary air preheater is a heat exchange device used in large coal-fired power plant boilers. It uses the heat from the boiler flue gas to heat the air required for combustion, thereby improving the boiler's efficiency. When the air preheater rotor goes from cold to hot, it deforms into a "mushroom-shaped" shape due to the different temperatures of the upper and lower end surfaces and the weakening of the steel's rigidity after being heated. Traditional rigid sealing plates are fixed to the rotor baffles in sections with bolts. As the rotor baffles deform, the air leakage gap also changes. Based on the mechanism of the rotor's "mushroom-shaped" deformation, appropriate cold-state clearances are reserved at the axial and cold-end radial positions, so that the dynamic and static clearances approach zero when hot. Although the reserved cold-state clearance at the hot-end radial position is very small, a larger triangular air leakage area will form when hot.

[0003] To reduce the triangular air leakage area and lower the air preheater leakage rate, two technical approaches are currently commonly adopted: the automatic sector plate tracking system (LCS), used by the three major domestic power plant manufacturers (Dongfang Boiler, Harbin Boiler, and Shanghai Boiler); and the recently developed flexible sealing technology. This, understandably, represents two aspects of a single issue: the air preheater sealing problem hinges on the fit between the sealing plate and the sector plate. Both automatic sealing plate contact with the sector plate and automatic sector plate tracking can reduce air leakage. However, both approaches face challenges in practical application. Due to factors such as harsh operating conditions (high temperatures, dust, etc.), maintenance quality, and management level, most power plants fail to operate LCS systems properly or experience suboptimal operational results. Howard, a leading global supplier of rotary air preheaters, has not yet implemented LCS systems on its air preheaters, highlighting the need for further improvement in this technology. Traditional flexible sealing technology, however, suffers from issues such as rapid wear, structural unreliability, and insufficient gap compensation, making it fundamentally unsuitable for project requirements.

[0004] The air leakage problem in the hot-end radial triangular leakage area has not been well solved. Moreover, as the units develop towards larger capacity, the diameter of the air preheater rotor continues to increase. If no measures are taken, the leakage share of the hot-end radial triangular leakage area will become larger and larger. If a traditional rigid sealing plate is used and the hot-end fan-shaped plate is not adjustable, the radial outermost edge gap of the hot end of the 300MW unit exceeds 10mm, the 600MW unit exceeds 25mm, and the 1000MW unit has a gap of about 50mm. The radial triangular leakage of the hot end of the air preheater equipped with units of 600MW and above accounts for more than 50% of the total air leakage, and the absolute air leakage to the flue gas side also exceeds 3%, and the primary air leakage rate may exceed 30%. For this reason, the present application proposes a dynamic thermal compensation sealing device for an air preheater based on dual drive to effectively solve the problem of radial triangular leakage at the hot end of the air preheater caused by heating. Utility Model Content

[0005] The technical purpose of the utility model is to provide a dynamic heat compensation sealing device for an air preheater based on dual drive, so as to solve the problem of radial triangular air leakage at the hot end of the air preheater caused by heating.

[0006] In order to solve the above problems, the technical solution of the utility model is:

[0007] A dual-drive-based dynamic thermal compensation sealing device for an air preheater, comprising:

[0008] A driving plate, a sealing sheet, a sealing pad, a wedge-shaped driving mechanism and an L-shaped driving amplification mechanism;

[0009] The adjacent end surfaces of the drive plate and the sealing plate are connected to each other and are installed together on the radial partition plate at the hot end of the air preheater rotor by a number of clamping bolts, and the drive plate is arranged close to the radial partition plate at the hot end of the air preheater rotor; the length direction of the drive plate and the sealing plate are consistent with the radial direction of the air preheater rotor; in the width direction of the drive plate, the top of the sealing plate is higher than the drive plate;

[0010] Along the length direction of the drive plate and the sealing piece, the whole is divided into a fixed section and a drive section; the fixed section is close to the center of the air preheater rotor, and the clamping bolts in the fixed section are completely fixed; the driving section is far away from the center of the air preheater rotor, and there is a movable margin between the clamping bolts in the driving section and the drive plate and the sealing piece;

[0011] The sealing gasket includes a fitting section and a bending section. The fitting section is tightly arranged between the driving plate and the radial partition plate at the hot end of the air preheater rotor. The bending section is connected to the top of the fitting section and is bent to fit the top of the radial partition plate at the hot end of the air preheater rotor.

[0012] The wedge-shaped driving mechanism is arranged in the middle position of the driving section and is located between the driving plate and the sealing plate. The wedge-shaped driving mechanism includes a first wedge block and a second wedge block that cooperate with each other. The first wedge block is connected to the driving plate, and the second wedge block is connected to the sealing plate. The first wedge block and the second wedge block cooperate with each other to slide.

[0013] The L-shaped drive amplification mechanism is arranged at the end of the drive section. The L-shaped drive amplification mechanism includes a fixed plate and an L-shaped drive arm. The fixed plate is connected to the radial partition on the hot end of the air preheater rotor. The corner of the L-shaped drive arm is rotatably connected to the fixed plate through a rotating shaft. The two ends of the L-shaped drive arm are respectively connected to the drive plate and the sealing plate.

[0014] The driving plate and the sealing plate are both in the shape of long strips, are both made of metal materials, and the linear expansion coefficient of the driving plate is greater than the linear expansion coefficient of the sealing plate.

[0015] Specifically, the first wedge block is fixedly connected to the top of the end surface of the driving plate, and the second wedge block is fixedly connected to the top of the end surface of the sealing plate; in the width direction of the driving plate, the first wedge block and the second wedge block are both lower than the top of the sealing plate.

[0016] There are two second wedge blocks, which are respectively located on both sides of the first wedge block and are slidably matched with both sides of the first wedge block.

[0017] Specifically, the shape of the first wedge block is a parallelogram structure with parallel upper and lower sides and parallel left and right hypotenuses, and the angle between its hypotenuse and the vertical direction is 30° to 60°. The side of the second wedge block adjacent to the first wedge block is parallel to the first wedge block and can be movably engaged with it.

[0018] Among them, a straight through hole is provided on the sealing plate, an arc-shaped groove with an upward opening is provided on the top of the driving plate, and the two ends of the L-shaped driving arm slide in cooperation with the straight through hole and the arc-shaped groove respectively.

[0019] Specifically, the fixing plate is connected to the radial partition plate at the hot end of the air preheater rotor by clamping bolts, the top of the fixing plate extends out of the radial partition plate at the hot end of the air preheater rotor and is provided with a rotation through hole;

[0020] A rotating shaft is provided to pass through the rotating through hole;

[0021] The L-shaped driving arm includes a transverse driving arm and a longitudinal driving arm connected perpendicularly to each other, and a rotation hole is provided at the connection between the transverse driving arm and the longitudinal driving arm, and the L-shaped driving arm is rotatably sleeved on the rotating shaft through the rotation hole;

[0022] The end of the transverse driving arm is slidably matched with the straight through hole, and the end of the longitudinal driving arm is slidably matched with the arc groove. The length of the transverse driving arm is greater than that of the longitudinal driving arm.

[0023] The end of the longitudinal driving arm is arc-shaped, and the end of the longitudinal driving arm is located in the arc-shaped groove and can slide along the arc-shaped groove.

[0024] Specifically, a columnar slide is provided at the end of the transverse driving arm and is arranged perpendicularly thereto. The columnar slide is arranged in the straight through hole and can slide along the length direction of the straight through hole.

[0025] The sealing pad is continuously or discontinuously arranged along the length direction of the driving plate.

[0026] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0027] The utility model discloses a dynamic thermal compensation sealing device for an air preheater based on dual drive. By arranging a wedge-shaped drive mechanism in the middle position of the drive section and an L-shaped drive amplifying mechanism at the end of the drive section, the compensation amount and the triangular air leakage area can be effectively complemented. The compensation amount increases with the increase of the triangular air leakage area and decreases with the decrease of the triangular air leakage area, thereby realizing effective dynamic compensation without the need to arrange an LCS, having low cost and stable operation. The wedge-shaped drive mechanism and the L-shaped drive amplifying mechanism cooperate with each other to effectively ensure the required compensation amount and significantly reduce the air leakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0029] Figure 1 This is a front view of a dual-drive-based air preheater dynamic thermal compensation sealing device according to the present invention;

[0030] Figure 2 For the utility model Figure 1 Cross-section view from the left side at AA in the middle;

[0031] Figure 3 For the utility model Figure 1 Cross-section view from the right side at the middle BB;

[0032] Figure 4 A perspective view of the L-shaped drive amplification mechanism and the wedge-shaped drive mechanism of the present invention;

[0033] Figure 5 This is a diagram showing the change from cold state to hot state of the air preheater dynamic thermal compensation sealing device based on dual drive of the utility model;

[0034] Figure 6 For the utility model Figure 5 The enlarged schematic diagram of c1-c2 in the middle;

[0035] Figure 7 For the utility model Figure 5 The enlarged schematic diagram of d1-d2 in the middle;

[0036] Figure 8 This is a front view of the L-shaped drive amplification mechanism of the present utility model;

[0037] Figure 9 It is a three-dimensional diagram of the L-shaped drive amplification mechanism of the present utility model.

[0038] Description of Reference Numerals

[0039] 1: Drive plate; 11: Arc groove; 2: Sealing plate; 21: I-shaped through hole; 3: L-shaped drive amplification mechanism; 31: L-shaped drive arm; 311: Horizontal drive arm; 312: Longitudinal drive arm; 313: Columnar slide; 32: Fixed plate; 33: Rotating shaft; 4: Wedge-shaped drive mechanism; 41: First wedge block; 42: Second wedge block; 5: Sealing pad; M: Expansion starting end; N: Rotor outer edge angle steel side; m: Fully fixed clamping bolt; n: Partially fixed clamping bolt. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0041] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0042] The following is a detailed description of a dual-drive air preheater dynamic thermal compensation sealing device proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims.

[0043] Example 1

[0044] See Figures 1 to 9A dual-drive-based dynamic thermal compensation sealing device for an air preheater mainly comprises: a driving plate 1, a sealing sheet 2, a sealing pad 5, a wedge-shaped driving mechanism 4 and an L-shaped driving amplification mechanism 3.

[0045] See Figures 1 to 4 In this embodiment, the drive plate 1 and the sealing plate 2 are both in the shape of long strips, and the adjacent end surfaces of the drive plate 1 and the sealing plate 2 are connected to each other, that is, they are overlapped in the thickness direction. The overlapped whole is mounted to the radial partition plate ( Figure 1 (not fully shown). Figure 1 As shown, the drive plate 1 is positioned near the radial baffle at the hot end of the air preheater rotor. This means that after securing, the drive plate 1 is positioned between the sealing plate 2 and the radial baffle at the hot end of the air preheater rotor. The lengths of the drive plate 1 and sealing plate 2 align with the radial direction of the air preheater rotor. In the width direction of the drive plate 1, the top of the sealing plate 2 is higher than the drive plate 1 and the radial baffle at the hot end. One end of the drive plate 1 and sealing plate 2 is located near the rotor center tube, i.e., the expansion start section M in the figure, while the other end is located near the angle steel side N at the outer edge of the rotor. Along the length of the drive plate 1 or sealing plate 2, the entire structure is divided into a fixed section and a driven section. The fixed section is defined as the length where the drive plate 1 and sealing plate 2 are completely secured by the clamping bolts (two to five (depending on the total number of clamping bolts, preferably three in this embodiment) clamping bolts m) at one end of the drive plate 1 and sealing plate 2 near the center of the air preheater rotor. (This section can also be understood as the length where the drive plate 1 and sealing plate 2 are completely secured by the clamping bolts. The drive plate 1 and sealing plate 2 within the fixed section cannot move relative to each other in the height direction.) The remaining non-fully fixed clamping bolts n are connected to the drive plate 1 and the sealing plate 2 with a margin of movement, and are defined as the drive section (it can also be understood that the length of the margin of movement between the drive plate 1 and the sealing plate 2 and the clamping bolts is defined as the drive section, and the drive plate 1 and the sealing plate 2 of the drive section can move relative to each other in the height direction, thereby compensating for the triangular air leakage area). That is, during installation, each clamping bolt is installed through the mounting holes on the hot end radial partition, the drive plate 1 and the sealing plate 2 at the same time, and is relatively fixed by nuts, some nuts are tightened, and some nuts are not fully tightened, so as to facilitate the relative expansion and dislocation of the drive plate 1 and the sealing plate 2 to compensate for the gap. The mounting holes on the drive plate 1 and the sealing plate 2 corresponding to the non-fully tightened clamping bolts (leaving a margin of movement) are all waist-shaped holes, among which the waist-shaped holes on the drive plate 1 are arranged horizontally, and the waist-shaped holes on the sealing plate 2 are arranged longitudinally.

[0046] See Figure 2 and Figure 3In this embodiment, the sealing gasket 5 includes a fitting section and a bending section. The fitting section is tightly arranged between the driving plate 1 and the radial partition of the hot end of the air preheater rotor. The bending section is connected to the top of the fitting section and is bent to fit the top of the radial partition of the hot end of the air preheater rotor. The material used for the sealing gasket 5 is the same as the material used for the hot end radial partition. The driving plate 1 and the sealing plate 2 are both made of metal material, and the linear expansion coefficient of the driving plate 1 is greater than the linear expansion coefficient of the sealing plate 2. The setting of the above-mentioned sealing gasket 5 can make up for the uneven defects on the radial partition of the hot end of the air preheater rotor to ensure the smooth expansion of the driving plate 1. And if a mounting hole on the radial partition of the hot end of the air preheater rotor is too large, a standard hole can be opened at the same position on the sealing gasket 5 to ensure the stability of the device.

[0047] See Figure 4 In this embodiment, the wedge-shaped drive mechanism 4 is positioned in the middle of the drive section, between the drive plate 1 and the sealing plate 2. The wedge-shaped drive mechanism 4 comprises a first wedge block 41 and a second wedge block 42 that cooperate with each other. The first wedge block 41 is connected to the drive plate 1, and the second wedge block 42 is connected to the sealing plate 2. The first wedge block 41 and the second wedge block 42 cooperate and slide with each other. The top of the wedge-shaped drive mechanism 4 is lower than the top of the sealing plate 2.

[0048] See Figure 4 In this embodiment, the L-shaped drive amplification mechanism 3 is arranged at the end of the drive section (the end away from the center of the air preheater rotor is the end of the drive section. The L-shaped drive amplification mechanism 3 is farther away from the center of the air preheater rotor than the wedge-shaped drive mechanism 4). The L-shaped drive amplification mechanism 3 includes a fixed plate 32 and an L-shaped drive arm 31. The fixed plate 32 is connected to the radial partition at the hot end of the air preheater rotor. The corners of the L-shaped drive arm 31 are rotatably connected to the fixed plate 32 via a rotating shaft 33. The two ends of the L-shaped drive arm 31 are respectively connected to the drive plate 1 and the sealing plate 2. The top of the L-shaped drive amplification mechanism 3 is lower than the top of the sealing plate 2.

[0049] See Figures 5 to 7 The principle of this embodiment is now explained: Because the linear expansion coefficient of the drive plate 1 is greater than that of the sealing plate 2, when heated, the differential expansion force causes the drive plate 1 and sealing plate 2 to become misaligned, thereby compensating for the radial clearance at the hot end. The wedge-shaped drive mechanism 4 and the L-shaped drive amplification mechanism 3 are respectively arranged at the middle and end of the drive section, which can effectively ensure the compensation amount at each radial position and effectively complement the triangular air leakage area. When expanding or contracting, the sealing plate 2 and the drive plate 1 move along the set path, which can not only ensure the stability of operation, but also accurately control the displacement amount, and thus accurately control the compensation amount. While effectively reducing the air preheater leakage rate, it ensures the safe and stable operation of the air preheater.

[0050] Example 2

[0051] See Figure 4 , based on Example 1, the wedge drive mechanism 4 can be improved as follows: In order to improve the operating stability of the entire device, the first wedge block 41 is welded and fixed to the top of the end face of the drive plate 1, and the second wedge block 42 is welded and fixed to the top of the end face of the sealing plate 2. In the width direction of the drive plate 1, the first wedge block 41 and the second wedge block 42 are both lower than the top of the sealing plate 2. In order to further improve the compensation effect, two second wedge blocks 42 are provided, and are respectively arranged on both sides of the first wedge block 41 and slide with both sides of the first wedge block 41. Specifically, the first wedge block 41 is a parallelogram structure with parallel upper and lower sides and two parallel hypotenuses. The angle between the hypotenuse and the vertical direction is 30° to 60°, preferably 45°. The two second wedge blocks 42 are parallel to each other on the side adjacent to the first wedge block 41 and are movably engaged with the first wedge block 41.

[0052] Example 3

[0053] See Figure 4 、 Figure 8 and Figure 9 , based on Example 2, the following improvements were made:

[0054] For ease of installation, the fixing plate 32 of the L-shaped drive amplification mechanism 3 is connected to the radial partition at the hot end of the air preheater rotor via clamping bolts. The fixing plate 32 can be installed in the desired position using the clamping bolts when the drive plate 1 and sealing plate 2 are installed. The top of the fixing plate 32 extends beyond the radial partition at the hot end of the air preheater rotor and is provided with a rotational through-hole through which a rotating shaft 33 extends.

[0055] Preferably, a straight through hole 21 is formed on the sealing plate 2, and an upwardly opening arcuate slot 11 is formed on the top of the driving plate 1. The two ends of the L-shaped driving arm 31 slide in cooperation with the straight through hole 21 and the arcuate slot 11 respectively.

[0056] Specifically, the L-shaped driving arm 31 comprises a transverse driving arm 311 and a longitudinal driving arm 312, which are perpendicularly connected to each other. A rotation hole is provided at the connection between the transverse and longitudinal driving arms 311, 312, through which the L-shaped driving arm 31 is rotatably mounted on the rotating shaft 33. The end of the transverse driving arm 311 slides in the I-shaped through-hole 21, while the end of the longitudinal driving arm 312 slides in the arcuate slot 11. The length of the transverse driving arm 311 is greater than that of the longitudinal driving arm 312. This maximizes the amount of end clearance compensation. The specific length of the active arm is determined based on the amount of compensation required in practice. When thermally expanded, the differential expansion drives the L-shaped driving arm 31 to rotate about the rotating shaft 33 (the end of the transverse driving arm 311 slides within the I-shaped through-hole 21, and the longitudinal driving arm 312 slides along the arcuate slot 11). This causes the driving plate 1 and the sealing plate 2 to shift along a specific path, compensating for the radial clearance at the hot end. During cooling, the L-shaped driving arm 311 contracts in the opposite direction along the specific path, restoring the misalignment.

[0057] Example 4

[0058] See Figure 8 and Figure 9 Based on Example 3, the following improvements are made: the bottom of the longitudinal drive arm 312 is arcuate and located within the arcuate groove 11, allowing it to slide along the arcuate groove 11. A vertical columnar slide 313 is provided at the end of the transverse drive arm 311. The columnar slide 313 is located within the straight-line through hole 21 and allows it to slide along the length of the straight-line through hole 21. The sealing plate 5 is continuously arranged along the length of the drive plate 1.

[0059] When the wedge-shaped drive mechanism 4 is heated and expanded or cooled, the first wedge block 41 moves relative to the horizontal direction, and the two second wedge blocks 42 on the sealing plate 2 convert their horizontal displacement into vertical upward and downward movement, respectively. When the L-shaped drive amplification mechanism 3 is heated and expanded or cooled, the radial relative displacement is converted into vertical axial upward displacement, and at the same time, the sealing plate 2 moves upward to form a misaligned displacement with the drive plate 1, which can effectively compensate for the triangular air leakage area at the hot end of the air preheater. The deformation of the above-mentioned sealing device and the mushroom-shaped deformation of the air preheater are both driven by heat, and the deformation directions of the two are opposite and synchronized, thereby keeping the radial gap at the hot end of the air preheater always maintained at a small level. By installing the two in a specific position, they can effectively complement the triangular air leakage area, effectively solving the problem of radial triangular air leakage at the hot end of the air preheater caused by heat.

[0060] In summary, the above examples are based on the dual-drive dynamic thermal compensation sealing device of the air preheater. By setting a wedge-shaped driving mechanism 4 in the middle position of the driving section and an L-shaped driving amplifying mechanism 3 at the end of the driving section, the compensation amount can be effectively complementary to the triangular air leakage area. The compensation amount increases with the increase of the triangular air leakage area, and decreases with the decrease of the triangular air leakage area, thereby achieving effective dynamic compensation. There is no need to set up LCS, the cost is low, and the operation is stable. The wedge-shaped driving mechanism 4 and the L-shaped driving amplifying mechanism 3 work together to effectively ensure the required compensation amount and significantly reduce the air leakage rate.

[0061] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they will still fall within the scope of protection of the present invention.

Claims

1. A dual-drive air preheater dynamic thermal compensation sealing device, characterized in that: include: A driving plate, a sealing sheet, a sealing pad, a wedge-shaped driving mechanism and an L-shaped driving amplifying mechanism; The adjacent end surfaces of the driving plate and the sealing plate are connected to each other and are installed on the radial partition plate at the hot end of the air preheater rotor through a plurality of clamping bolts, and the driving plate is arranged close to the radial partition plate at the hot end of the air preheater rotor; the length directions of the driving plate and the sealing plate are consistent with the radial direction of the air preheater rotor; in the width direction of the driving plate, the top of the sealing plate is higher than the driving plate; Along the length direction of the driving plate and the sealing sheet, the whole is divided into a fixed section and a driving section; the fixed section is close to the center of the air preheater rotor, and the clamping bolts located in the fixed section are completely fixed; the driving section is far away from the center of the air preheater rotor, and there is a movable margin between the clamping bolts located in the driving section and the driving plate and the sealing sheet; The sealing gasket includes a fitting section and a bending section, wherein the fitting section is tightly arranged between the driving plate and the radial partition plate at the hot end of the air preheater rotor, and the bending section is connected to the top of the fitting section and is bent to fit the top of the radial partition plate at the hot end of the air preheater rotor; The wedge-shaped driving mechanism is arranged at the middle position of the driving section and is located between the driving plate and the sealing sheet. The wedge-shaped driving mechanism comprises a first wedge block and a second wedge block which cooperate with each other. The first wedge block is connected to the driving plate, and the second wedge block is connected to the sealing sheet. The first wedge block and the second wedge block cooperate with each other to slide. The L-shaped drive amplification mechanism is arranged at the end of the drive section, and the L-shaped drive amplification mechanism includes a fixed plate and an L-shaped drive arm. The fixed plate is connected to the radial partition plate at the hot end of the air preheater rotor. The corner of the L-shaped drive arm is rotatably connected to the fixed plate through a rotating shaft, and the two ends of the L-shaped drive arm are respectively connected to the drive plate and the sealing plate.

2. The dual-drive air preheater dynamic thermal compensation sealing device according to claim 1 is characterized in that: The driving plate and the sealing sheet are both in the shape of long strips, and are both made of metal materials, and the linear expansion coefficient of the driving plate is greater than the linear expansion coefficient of the sealing sheet.

3. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 1 is characterized in that: The first wedge block is fixedly connected to the top of the end surface of the driving plate, and the second wedge block is fixedly connected to the top of the end surface of the sealing plate; in the width direction of the driving plate, the first wedge block and the second wedge block are both lower than the top of the sealing plate.

4. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 3 is characterized in that: Two second wedge blocks are provided. The second wedge blocks are respectively located on both sides of the first wedge block and are respectively slidably matched with both sides of the first wedge block.

5. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 3 or 4, characterized in that: The shape of the first wedge block is a parallelogram structure with parallel upper and lower sides and parallel left and right hypotenuses, and the angle between the hypotenuse and the vertical direction is 30° to 60°. The side of the second wedge block adjacent to the first wedge block is parallel to the first wedge block and can be movably engaged with it.

6. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 1 is characterized in that: The sealing sheet is provided with a straight through hole, the top of the driving plate is provided with an arc-shaped groove with an opening facing upward, and the two ends of the L-shaped driving arm are respectively slidably matched with the straight through hole and the arc-shaped groove.

7. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 6 is characterized in that: The fixing plate is connected to the radial partition plate at the hot end of the air preheater rotor by clamping bolts, the top of the fixing plate extends out of the radial partition plate at the hot end of the air preheater rotor and is provided with a rotation through hole; A rotating shaft is provided to penetrate the rotating through hole; The L-shaped driving arm comprises a transverse driving arm and a longitudinal driving arm vertically connected to each other, a rotation hole is provided at the connection between the transverse driving arm and the longitudinal driving arm, and the L-shaped driving arm is rotatably sleeved on the rotating shaft through the rotation hole; The end of the transverse driving arm is slidably matched with the I-shaped through hole, the end of the longitudinal driving arm is slidably matched with the arc groove, and the length of the transverse driving arm is greater than the length of the longitudinal driving arm.

8. The dual-drive air preheater dynamic thermal compensation sealing device according to claim 7 is characterized in that: The end of the longitudinal driving arm is arc-shaped, and the end of the longitudinal driving arm is located in the arc-shaped groove and can slide along the arc-shaped groove.

9. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 7 is characterized in that: The end of the lateral driving arm is provided with a columnar slide which is arranged perpendicularly thereto. The columnar slide is arranged in the I-shaped through hole and can slide along the length direction of the I-shaped through hole.

10. The air preheater dynamic thermal compensation sealing device based on dual drive according to claim 1, characterized in that: The sealing pad is continuously or discontinuously arranged along the length direction of the driving plate.

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