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

Abstract

The invention 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 at the middle position and 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 invention 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 drive. Background Art

[0002] The rotary air preheater is a heat exchange device used in large coal-fired power plant boilers. It uses the heat of boiler flue gas to heat the air required for combustion, thereby improving the efficiency of the boiler. When the air preheater rotor changes 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 rigidity of the steel after being heated. The traditional rigid sealing plate is fixed to the rotor partition in sections by bolts. As the rotor partition deforms, the air leakage gap also changes. Based on the mechanism of the "mushroom-shaped" deformation of the rotor, appropriate cold clearances are reserved at the axial and cold end radial positions, and the dynamic and static clearances tend to zero in the hot state; although the cold clearance reserved at the hot end radial position is very small, a larger triangular air leakage area will be formed in the hot state.

[0003] In order to reduce the area of ​​the above-mentioned triangular air leakage area and reduce the air leakage rate of the air preheater, two technical routes are generally adopted in the current engineering: one is the fan plate automatic tracking system (LCS for short) equipped by the three major domestic main engine manufacturers (Dongguo, Harbin and Shangguo); the other is the flexible sealing technology developed in recent years. It is not difficult to understand that this actually reflects two aspects of a problem: the air preheater sealing problem is the problem of matching the sealing sheet with the fan plate. The sealing sheet automatically sticks to the fan plate and the fan plate automatically tracks the sealing sheet to achieve the purpose of reducing air leakage. However, both solutions have the following problems in engineering applications: Affected by various factors such as harsh working conditions (high temperature, dust, etc.), maintenance quality, and management level, most power plant LCS systems cannot be put into operation normally or the operation effect is not ideal. HOWDEN, the world's leading supplier of rotary air preheaters, has not equipped LCS on the air preheater, which also shows from the side that this technology needs to be further improved. The traditional flexible sealing technology has exposed problems such as excessive wear, unreliable structure, and insufficient gap compensation, which cannot meet the engineering requirements at all.

[0004] The air leakage problem in the radial triangular air leakage area at the hot end has not been well solved. Moreover, as the unit develops towards large capacity, the diameter of the air preheater rotor continues to increase. If no measures are taken, the air leakage share in the radial triangular air leakage area at the hot end will become larger and larger. If a traditional rigid sealing plate is used and the hot end fan plate is not adjustable, the radial outermost gap at the hot end of a 300MW unit exceeds 10mm, the 600MW unit exceeds 25mm, and the 1000MW unit has a gap of about 50mm. The radial triangular air leakage at 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%. To this end, 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 air leakage at the hot end of the air preheater caused by heating. Summary of the invention

[0005] The technical purpose of the present invention is to provide a dual-drive-based dynamic thermal compensation sealing device for an air preheater to solve the problem of radial triangular air leakage at the hot end of the air preheater caused by heating.

[0006] To solve the above problems, the technical solution of the present invention is:

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

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

[0009] The adjacent end faces 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 number 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;

[0010] 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 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 margin of movement between the clamping bolts in the driving section and the driving plate and the sealing sheet;

[0011] 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;

[0012] 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.

[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 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. 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 sheet 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 sheet.

[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 first wedge block is in the shape of 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.

[0018] 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.

[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 penetrate the rotating through hole;

[0021] The L-shaped driving arm comprises a transverse driving arm and a longitudinal driving arm which are vertically connected to each other, a rotating 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 rotating hole;

[0022] The end of the transverse driving arm is slidably matched with the straight 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 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 disposed at the end of the transverse driving arm and is vertically disposed therewith. The columnar slide is disposed in the straight-line through hole and can slide along the length direction of the straight-line through hole.

[0025] The sealing pad is arranged continuously or discontinuously 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 invention is based on a dual-drive dynamic thermal compensation sealing device for an air preheater. By arranging a wedge-shaped driving mechanism at the middle position of a driving section and arranging an L-shaped driving amplifying mechanism at the end of the driving section, the compensation amount and the triangular air leakage area can be effectively complemented. The compensation amount is increased as the triangular air leakage area increases, and the compensation amount is reduced as the triangular air leakage area decreases, thereby realizing effective dynamic compensation. There is no need to arrange an LCS, the cost is low, and the operation is stable. The wedge-shaped driving mechanism and the L-shaped driving amplifying mechanism cooperate with each other, which can effectively ensure the required compensation amount and significantly reduce the air leakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

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

[0030] Figure 2 For the present invention Figure 1 Cross-sectional view from the left side at the middle AA;

[0031] Figure 3 For the present invention Figure 1 Cross-sectional view from the right side of the middle BB;

[0032] Figure 4 A three-dimensional diagram of the arrangement of the L-shaped drive amplifying mechanism and the wedge-shaped drive mechanism of the present invention;

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

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

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

[0036] Figure 8 It is a front view of the L-shaped driving and amplifying mechanism of the present invention;

[0037] Fig. 9 It is a three-dimensional diagram of the L-shaped driving and amplifying mechanism of the present invention.

[0038] Description of Reference Numerals

[0039] 1: driving plate; 11: arc groove; 2: sealing plate; 21: straight through hole; 3: L-shaped driving amplification mechanism; 31: L-shaped driving arm; 311: horizontal driving arm; 312: longitudinal driving arm; 313: columnar slide; 32: fixing plate; 33: rotating shaft; 4: wedge-shaped driving 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: non-fully 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 accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0041] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0042] The following is a further detailed description of a dual-drive air preheater dynamic heat 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

[0044] See also Figures 1 to 9 A 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 also 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 faces of the drive plate 1 and the sealing plate 2 are connected to each other, that is, the two 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 arranged near the radial partition of the hot end of the air preheater rotor. It can be understood that after the fixing is completed, the drive plate 1 is located between the sealing plate 2 and the radial partition of the hot end of the air preheater rotor. The length direction of the drive plate 1 and the sealing plate 2 are consistent 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 partition of the hot end. One end of the drive plate 1 and the sealing plate 2 is close to the rotor center tube, that is, the expansion starting section M in the figure, and the other end is close to the angle steel side N of the outer edge of the rotor. Along the length direction of the drive plate 1 or the sealing plate 2, it is divided into a fixed section and a driving section as a whole. Among them, 2 to 5 (based on the total number of clamping bolts, preferably, 3 are used in this embodiment) fully fixed clamping bolts m at one end of the drive plate 1 and the sealing plate 2 close to the center of the air preheater rotor are defined as the fixed section (it can also be understood that the length of the drive plate 1 and the sealing plate 2 completely fixed by the clamping bolts is defined as the fixed section, and the drive plate 1 and the sealing plate 2 located in the fixed section cannot move relative to each other in the height direction). The remaining clamping bolts n that are not completely fixed have a margin of movement when connected to the drive plate 1 and the sealing plate 2, 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 to pass through the mounting holes on the hot end radial partition, the drive plate 1 and the sealing plate 2 at the same time, and are relatively fixed by nuts, some nuts are tightened, and some nuts are not completely 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 incomplete tightening of the 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 also 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 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 at the hot end of the air preheater rotor. The material used for the sealing gasket 5 is consistent with 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 at the hot end of the air preheater rotor to ensure the smooth expansion of the driving plate 1. And if a certain mounting hole on the radial partition at 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 also Figure 4 In this embodiment, the wedge-shaped driving mechanism 4 is arranged in the middle of the driving section and between the driving plate 1 and the sealing sheet 2. The wedge-shaped driving mechanism 4 includes 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 driving plate 1, and the second wedge block 42 is connected to the sealing sheet 2. The first wedge block 41 and the second wedge block 42 cooperate with each other to slide. The top of the wedge-shaped driving mechanism 4 is lower than the top of the sealing sheet 2.

[0048] See also 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, and the L-shaped drive amplification mechanism 3 is farther 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 plate at the hot end of the air preheater rotor. The corner of the L-shaped drive arm 31 is rotatably connected to the fixed plate 32 through 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 also Figures 5 to 7 , the principle of this embodiment is now explained: since the linear expansion coefficient of the driving plate 1 is greater than the linear expansion coefficient of the sealing plate 2, when heated, under the force of the expansion difference, the driving plate 1 and the sealing plate 2 will be misaligned, thereby compensating the hot end radial gap. The wedge-shaped driving mechanism 4 and the L-shaped driving amplification mechanism 3 are respectively arranged at the middle and end of the driving 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 driving plate 1 are displaced according to the set path, which can not only ensure the stability of operation, but also accurately control the displacement amount, thereby accurately controlling the compensation amount, effectively reducing the air leakage rate of the air preheater, and ensuring the safe and stable operation of the air preheater.

[0050] Example 2

[0051] See also Figure 4 , based on Example 1, the wedge-shaped driving mechanism 4 can be improved as follows: in order to improve the running stability of the overall device, the first wedge block 41 is welded and fixed to the top of the end surface of the driving plate 1, and the second wedge block 42 is welded and fixed to the top of the end surface of the sealing plate 2. In the width direction of the driving 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 are slidably matched 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, and the angle between the hypotenuse and the vertical direction is 30° to 60°, preferably 45°. The two second wedge blocks 42 are parallel to the first wedge block 41 on one side adjacent to the first wedge block 41, and are movably close to each other.

[0052] Example 3

[0053] See also Figure 4 , Figure 8 and Fig. 9 , based on Example 2, the following improvements are further made:

[0054] For easy installation, the fixing plate 32 of the L-shaped drive amplification mechanism 3 is connected to the radial partition plate at the hot end of the air preheater rotor by clamping bolts. When installing the drive plate 1 and the sealing plate 2, the fixing plate 32 can be installed together at the designed position by using the clamping bolts. The top of the fixing plate 32 extends out of the radial partition plate at the hot end of the air preheater rotor, and is provided with a rotating through hole, and a rotating shaft 33 is provided to penetrate the rotating through hole.

[0055] Preferably, a straight through hole 21 is provided on the sealing plate 2, and an arc-shaped groove 11 with an upward opening is provided on the top of the driving plate 1. The two ends of the L-shaped driving arm 31 are respectively slidably matched with the straight through hole 21 and the arc-shaped groove 11.

[0056] Specifically, the L-shaped driving arm 31 includes a transverse driving arm 311 and a longitudinal driving arm 312 which are vertically connected to each other. A rotating hole is provided at the connection between the transverse driving arm 311 and the longitudinal driving arm 312. The L-shaped driving arm 31 is rotatably sleeved on the rotating shaft 33 through the rotating hole. The end of the transverse driving arm 311 is slidably matched with the straight through hole 21, and the end of the longitudinal driving arm 312 is slidably matched with the arc groove 11. The length of the transverse driving arm 311 is greater than the length of the longitudinal driving arm 312. In this way, the end gap compensation amount can be enlarged. The specific length of the active arm is determined according to the amount of compensation required in practice. When heated and expanded, under the action of the expansion difference, the L-shaped driving arm 31 will be driven to rotate around the rotating shaft 33 (the end of the transverse driving arm 311 slides in the straight through hole 21, and the longitudinal driving arm 312 slides along the arc groove 11), thereby causing the driving plate 1 and the sealing plate 2 to be dislocated along a specific path to compensate for the hot end radial gap. When cooled, it will shrink in the opposite direction along the specific path to restore the dislocation.

[0057] Example 4

[0058] See also Figure 8 and Fig. 9 On the basis of Example 3, the following improvements are further made: the bottom of the longitudinal driving arm 312 is arc-shaped, the bottom of the longitudinal driving arm 312 is located in the arc groove 11, and can slide along the arc groove 11. The end of the transverse driving arm 311 is provided with a vertically arranged columnar slide 313, the columnar slide 313 is located in the straight-line through hole 21, and can slide along the length direction of the straight-line through hole 21. The sealing pad 5 is continuously arranged along the length direction of the driving plate 1.

[0059] When the wedge-shaped driving mechanism 4 is heated and expanded or cooled, the first wedge block 41 moves relatively in the horizontal direction, and the two second wedge blocks 42 on the sealing plate 2 convert its horizontal displacement into vertical warping and sinking respectively. When the L-shaped driving 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 driving 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 synchronous, so as to keep the radial clearance of 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, and effectively solve the problem of radial triangular air leakage at the hot end of the air preheater caused by heating.

[0060] In summary, the above examples are based on the dual-drive dynamic thermal compensation sealing device for air preheater. By arranging 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 and the triangular air leakage area can be effectively complemented. The compensation amount increases with the increase of the triangular air leakage area, and the compensation amount decreases with the decrease of the triangular air leakage area, thereby realizing 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 in conjunction with 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 still fall within the protection scope 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 1 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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