Supporting device for sealing operation of heat exchange tube at cold end of tubular air pre-heater

Abstract

The invention discloses a tubular air pre-heater cold end heat exchange tube sealing operation supporting device which comprises a base unit, a moving assembly and a supporting assembly arranged on the upper portion of the moving assembly. The adjusting unit comprises a telescopic assembly and a rotating assembly arranged on the upper portion of the telescopic assembly. Wherein the rotating assembly comprises a rotating frame, a to-be-replaced pipe of the air pre-heater or a sealing rubber pipe can be placed on the rotating frame, and the positions of the to-be-replaced pipe of the air pre-heater and the sealing rubber pipe can be adjusted by rotating the rotating frame to achieve rapid sealing operation. Sealant is adopted for pipe replacement operation of the air pre-heater, gluing and pipe replacement operation are assisted through the supporting device, the overhaul period can be shortened, the invested material cost and labor cost can be reduced, constructors can be prevented from working in a high-risk operation environment for a long time, the safety of the constructors is guaranteed, and the working efficiency is improved. And the problem of air leakage of the pipeline in the air pre-heater is solved through the sealant, and the stability of the air pre-heater is improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline replacement, in particular to a sealing operation support device for a cold end heat exchange tube of a tubular air preheater. Background Art

[0002] Low-temperature corrosion and sulfuric acid and sulfurous acid deposition in air preheaters are common problems in thermal power plants, which leads to large-scale tube replacement in tubular air preheaters when dealing with low-temperature corrosion and leakage. The low-temperature end tubes of the first return layer of the air preheater are seriously corroded and leaked. A large number of tube replacements (about 1,000 tubes) are carried out during each minor repair. The labor and material costs are high. In order to reduce the cost of air preheater tube replacement and shorten the maintenance period, it is planned to use high-temperature resistant sealant to replace the welding and grinding between the tube body and the tube sheet.

[0003] For circulating fluidized bed boilers, the boiler air preheater adopts a horizontal, in-line, four-pass arrangement, with air flowing inside the tube and flue gas flowing outside the tube, located in the double flue below the tail shaft. Due to the low inlet air temperature, there is severe low-temperature corrosion on the tube body at the low-temperature end of the first pass. At present, the boiler air preheater has serious air leakage during operation, which brings the following problems:

[0004] 1. Air leakage causes leakage and damage to the air preheater tube, resulting in serious air leakage and deterioration of the combustion conditions. In severe cases, the heating surface has to be replaced frequently, which not only increases the maintenance workload and material loss, but also affects the normal operation of the boiler.

[0005] 2. Air leakage in the air preheater causes cold air to enter the flue gas side, lowering the flue gas temperature, accelerating low-temperature corrosion and ash blockage, and affecting the safe operation of the boiler. Currently, the air preheater of boiler No. 1 is leaking seriously, and the exhaust gas temperature deviation on the AB side of the outlet is around 60°C.

[0006] 3. The tube replacement work at the cold end of the air preheater takes a long time and the installation process has problems such as the tube body is too long to penetrate into the tube sheet, the welding process takes a long time and the sealing is poor. Summary of the invention

[0007] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0008] Therefore, the object of the present invention is to provide a sealing operation support device for the cold end heat exchange tube of a tubular air preheater, which can prevent air leakage of the air preheater, improve the efficiency of replacement and installation operations and achieve the effect of reducing costs.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions: a tubular air preheater cold end heat exchange tube sealing operation support device, which includes a base unit, a moving assembly, and a support assembly arranged on the upper part of the moving assembly;

[0010] The adjusting unit comprises a telescopic assembly and a rotating assembly arranged on the upper part of the telescopic assembly;

[0011] Among them, the rotating component includes a rotating frame, which can place the air preheater pipe to be replaced or the sealing hose, and the position of the air preheater pipe to be replaced and the sealing hose can be adjusted by rotating the rotating frame to achieve rapid sealing operation.

[0012] As a preferred solution of the sealing operation support device of the cold end heat exchange tube of the tubular air preheater of the present invention, the rotating assembly also includes a supporting column rotatably connected to the rotating frame, a one-way wheel arranged on both sides of the supporting column, a telescopic spring tooth arranged on one side of the one-way wheel, a locking tooth arranged on one side of the one-way wheel, and a trigger rod fixedly connected to one side of the one-way wheel.

[0013] As a preferred solution of the sealing operation support device of the cold end heat exchange tube of the tubular air preheater of the present invention, the rotating frame includes a rotating shaft, a rotating rod fixedly connected to one side of the rotating shaft, four groups of fixed brackets fixedly connected to one side of the rotating shaft, a pipe body bracket fixedly connected to one side of the fixed bracket, a hose connecting seat fixedly connected to one side of the fixed bracket, and a hose bracket rotatably connected to the hose connecting seat.

[0014] As a preferred solution of the sealing operation support device for the cold end heat exchange tube of the tubular air preheater of the present invention, the moving component includes a universal wheel.

[0015] As a preferred solution of the sealing operation support device of the cold end heat exchange tube of the tubular air preheater of the present invention, the support assembly includes a support base and a support round seat arranged on the upper part of the support base.

[0016] As a preferred solution of the sealing operation support device of the cold end heat exchange tube of the tubular air preheater of the present invention, the telescopic assembly includes a telescopic sleeve, a rack fixedly connected to the upper part of the support round seat, a sliding column symmetrically arranged with the rack relative to the support round seat, a gear rotatably connected to the telescopic sleeve, a driving shaft fixedly connected to the gear, driving wheels symmetrically arranged on both sides of the gear, a telescopic clamping column arranged at the lower part of the driving wheel, a pawl arranged on one side of the driving wheel, a connecting plate rotatably connected to the pawl, a connecting rod fixedly connected to the upper part of the connecting plate, an arc-shaped trigger strip fixedly connected to one side of the connecting rod, and a reset spring connected to the telescopic sleeve at one end and the connecting plate at the other end.

[0017] As a preferred solution of the sealing operation support device for the heat exchange tube at the cold end of the tubular air preheater of the present invention, wherein: the one-way wheel is rotatably connected to the support column, the telescopic spring tooth is adapted to the latch tooth, and the telescopic spring tooth is fixedly connected to one side of the rotating shaft;

[0018] The upper part of the universal wheel is fixedly connected to the lower part of the supporting base, and the driving shaft is fixedly connected to the driving wheel.

[0019] Beneficial effects of the present invention: The present invention adopts sealant to replace the pipes of the air preheater, and uses a supporting device to assist in the gluing and pipe replacement operations, which can shorten the maintenance period, reduce the material cost and labor cost, and also avoid construction workers working in a high-risk working environment for a long time, thereby ensuring the safety of the workers. The sealant solves the problem of air leakage in the pipes of the air preheater and improves the stability of the air preheater. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of the sealing support device for the cold end heat exchange tube of the tubular air preheater.

[0022] Figure 2 This is a schematic diagram of the overall structure of one side of the rotating frame of the sealing support device for the cold end heat exchange tube of the tubular air preheater.

[0023] Figure 3 This is a schematic diagram of the internal structure of the telescopic component of the sealing support device for the cold end heat exchange tube of the tubular air preheater.

[0024] Figure 4 This is a schematic diagram of the rotating component structure of the sealing support device for the cold end heat exchange tube of the tubular air preheater.

[0025] Figure 5 This is a schematic diagram of the internal structure of the rotating assembly of the sealing support device for the cold end heat exchange tube of the tubular air preheater.

[0026] In the figure: 100, base unit; 101, moving assembly; 102, supporting assembly; 200, adjusting unit; 201, telescopic assembly; 202, rotating assembly; 101a, universal wheel; 102a, supporting base; 102b, supporting round seat; 201a, telescopic sleeve; 201b, rack; 201c, sliding column; 201d, gear; 201e, driving shaft; 201f, driving wheel; 201g, telescopic clamping column; 201h, ratchet; 201i , connecting plate; 201j, connecting rod; 201k, arc-shaped trigger strip; 201l, reset spring; 202a, rotating frame; 202b, supporting column; 202c, one-way wheel; 202d, telescopic spring tooth; 202e, latch tooth; 202f, trigger rod; 202a-1, rotating shaft; 202a-2, rotating rod; 202a-3, fixed bracket; 202a-4, tube body bracket; 202a-5, hose connecting seat; 202a-6, hose bracket. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figure 1 to Figure 5 , which is the first embodiment of the present invention, provides a tubular air preheater cold end heat exchange tube sealing operation support device, which includes a base unit 100 and an adjustment unit 200, which can prevent air leakage in the air preheater, improve the replacement and installation efficiency and achieve the effect of reducing costs.

[0032] Specifically, the base unit 100 includes a moving component 101 and a supporting component 102 disposed on the upper portion of the moving component 101;

[0033] The adjustment unit 200 includes a telescopic component 201 and a rotating component 202 disposed on the upper portion of the telescopic component 201;

[0034] The rotating assembly 202 includes a rotating frame 202a, on which the air preheater tubes to be replaced or the sealing hoses can be placed. The positions of the air preheater tubes to be replaced and the sealing hoses can be adjusted by rotating the rotating frame 202a to achieve rapid sealing operations.

[0035] Furthermore, the rotating assembly 202 also includes a supporting column 202b rotatably connected to the rotating frame 202a, a one-way wheel 202c arranged on both sides of the supporting column 202b, a telescopic spring tooth 202d arranged on one side of the one-way wheel 202c, a latch tooth 202e arranged on one side of the one-way wheel 202c, and a trigger rod 202f fixedly connected to one side of the one-way wheel 202c, the bottom of the supporting column 202b is fixedly connected to the top of the telescopic sleeve 201a, the bottom of the supporting column 202b and the telescopic sleeve 201a are fixedly connected at two groups of rod bodies, the top of the supporting column 202b is a circle that can be rotatably connected to the rotating frame 202a, the telescopic spring tooth 202d is a telescopic rod with a return spring arranged inside and the end is an inclined surface adapted to the angle of the latch tooth 202e, and the latch tooth 202e is evenly distributed in a ring shape. The one-way wheels 202c are arranged on the inner wall of the one-way wheel 202c, the one-way wheel 202c is rotatably connected with the supporting column 202b and a circular through hole is arranged at the center of the circle. The two groups of one-way wheels 202c are provided with a plurality of groups of latch teeth 202e. When the telescopic elastic teeth 202d are driven by the rotating rod 202a-2 and rotate inside the one-way wheel 202c, the telescopic elastic teeth 202d touch the latch teeth 202e through the end inclined surface, and under the telescopic effect of the telescopic elastic teeth 202d, the telescopic elastic teeth 202d drive the one-way wheel 202c to rotate only when the end inclined surface and the latch teeth 202e are mutually limited. The two groups of one-way wheels 202c can rotate in opposite directions. The two groups of trigger rods 202f are respectively located in a plane parallel to the one-way wheel 202c with a group of arc-shaped trigger bars 201k, so that the trigger rod 202f can touch the arc-shaped trigger bar 201k when it rotates to the bottom.

[0036] A damper is provided at the connection between the one-way wheel 202c and the support column 202b. The damper can prevent the one-way wheel 202c from rotating due to friction when the telescopic spring tooth 202d is not limited by the locking tooth 202e. A built-in spring is provided inside the telescopic spring tooth 202d.

[0037] Furthermore, the rotating frame 202a includes a rotating shaft 202a-1, a rotating rod 202a-2 fixedly connected to one side of the rotating shaft 202a-1, four groups of fixed brackets 202a-3 fixedly connected to one side of the rotating shaft 202a-1, a tube body bracket 202a-4 fixedly connected to one side of the fixed bracket 202a-3, a hose connecting seat 202a-5 fixedly connected to one side of the fixed bracket 202a-3, and a hose bracket 202a-6 rotatably connected to the hose connecting seat 202a-5, the rotating shaft 202a-1 is rotatably connected to the supporting column 202b, each group of fixed brackets 202a-3 are parallel to each other and symmetrically distributed at both ends of the rotating shaft 202a-1, and the tube body bracket 202a-4 is a circular sleeve that can place the tube to be connected on the tube body On the bracket 202a-4, during operation and installation, adjust the pipe body bracket 202a-4 to the fixed bracket 202a-3 perpendicular to the ground so that the pipe body bracket 202a-4 is parallel to the ground to assist in installation. The hose bracket 202a-6 is also a hollow cylinder, and the glue hose can be placed at the center of the hose bracket 202a-6. The hose connecting seat 202a-5 consists of an arc base fixedly connected to the fixed bracket 202a-3 and a connecting shaft rotatably connected to the arc base on one side. When gluing, the staff can use manpower to rotate the hose bracket 202a-6 with the connecting shaft in the hose connecting seat 202a-5 as the axis. The staff aligns the hose connecting seat 202a-5 with the center of the pipe hole at the tube plate to be glued, and simultaneously pushes the sealing hose to glue the connection with the pipe wall while rotating.

[0038] Furthermore, the moving assembly 101 includes a universal wheel 101a.

[0039] Furthermore, the support assembly 102 includes a support base 102a and a support round seat 102b disposed on the upper portion of the support base 102a.

[0040] Furthermore, the telescopic assembly 201 includes a telescopic sleeve 201a, a rack 201b fixedly connected to the upper part of the supporting circular seat 102b, a sliding column 201c symmetrically arranged with the rack 201b relative to the center of the supporting circular seat 102b, a gear 201d rotatably connected to the telescopic sleeve 201a, a driving shaft 201e fixedly connected to the gear 201d, driving wheels 201f symmetrically arranged on both sides of the gear 201d, a telescopic clamping column 201g arranged at the lower part of the driving wheel 201f, a pawl 201h arranged on one side of the driving wheel 201f, a connecting plate 201i rotatably connected to the pawl 201h, a connecting rod 201j fixedly connected to the upper part of the connecting plate 201i, an arc-shaped trigger strip 201k fixedly connected to one side of the connecting rod 201j, and a reset spring having one end connected to the telescopic sleeve 201a and the other end connected to the connecting plate 201i. Spring 201l, telescopic sleeve 201a is slidably connected with sliding column 201c, and the rotation angle of pawl 201h can only rotate clockwise along the connection with connecting plate 201i, that is, it rotates downward along the end of pawl 201h. When pawl 201h is pushed downward by the action of connecting rod 201j, it will push the driving wheel 201f to rotate counterclockwise under the action of limit, that is, it rotates along the downward force of the end of pawl 201h on the corresponding side. The driving wheel 201f only rotates in the pushing direction of the pawl 201h, and there is a clockwise rotation limit, that is, there is a limit in the upward direction along the end of the pawl 201h on the corresponding side. The driving wheels 201f on both sides rotate in opposite directions and have opposite limit directions. When the driving wheel 201f on either side rotates, it will drive the gear 201d fixedly connected to the driving shaft 201e through the driving shaft 201e fixedly connected to the driving wheel 201f to rotate in the same direction.

[0041] A torsion spring is connected between the pawl 201h and the connecting plate 201i, the pawl 201h is adapted to the driving wheel 201f, a built-in spring is arranged inside the telescopic clamping column 201g, the gear 201d is meshed and connected with the rack 201b, a damper is connected between the driving shaft 201e and the telescopic sleeve 201a, and a cavity adapted to the sliding column 201c, the rack 201b, the gear 201d, the driving wheel 201f, the pawl 201h, the connecting plate 201i, the connecting rod 201j and the reset spring 201l is arranged inside the telescopic sleeve 201a.

[0042] Furthermore, the one-way wheel 202c is rotatably connected to the support column 202b, the telescopic spring tooth 202d is adapted to the latch tooth 202e, and the telescopic spring tooth 202d is fixedly connected to one side of the rotating shaft 202a-1;

[0043] The upper portion of the universal wheel 101a is fixedly connected to the lower portion of the support base 102a, and the driving shaft 201e is fixedly connected to the driving wheel 201f.

[0044] It should be noted that the dust, rust, oil and water stains on the ends of the tube body and the tube sheet should be cleaned (to facilitate the bonding of the sealant). When applying the first layer of sealant, the gap between the tube body and the tube sheet should be filled. The total thickness of the sealant should not be less than 10mm and the width should not be less than 30mm. The sealant should have high sealing performance, strong plasticity, high temperature resistance, and will not dissolve when used in a high temperature environment of about 200°C. The maintenance time should not be less than 48 hours. The size of the drive wheel 201f is larger than the size of the gear 201d.

[0045] When in use, the leaking tube body needs to be polished and the tube mouth removed. After replacing the new tube body, the tube body and the tube sheet are spot welded to fix them. During the spot welding process, a gap of about 2 mm should be left between the tube body and the tube sheet as much as possible to facilitate the sealing of the glue.

[0046] When in use, place the sealing hose on the hose holder 202a-6, and then shake the rotating rod 202a-2 to rotate the rotating shaft 202a-1. At this time, the hose holder 202a-6 fixedly connected to one side of the rotating shaft 202a-1 will rotate at the same time. Adjust it to the working height and turn the hose holder 202a-6 to simultaneously achieve gluing around the tube plate. At the same time, when the rotating rod 202a-2 rotates, the two sets of telescopic spring teeth 202d will drive the two sets of latch teeth 202e to rotate when they are rotated clockwise and counterclockwise respectively. When rotating in the opposite direction, the one-way wheel 202c will not rotate through the arc surface on the telescopic spring teeth 202d and the latch teeth 202e, which means that One set of one-way wheels 202c will not move only when the rotating rod 202a-2 and the rotating shaft 202a-1 rotate clockwise and counterclockwise. The other set of one-way wheels 202c is the opposite. When one set of one-way wheels 202c is rotated to a certain angle, the trigger rod 202f fixedly connected to one side of the one-way wheel 202c will squeeze the arc-shaped trigger bar 201k and drive the pawl 201h to descend through the connecting rod 201j and the connecting rod 201j. When descending, the pawl 201h will touch the driving wheel 201f and make the driving wheel 201f rotate a certain distance. When the driving wheel 201f rotates, the driving shaft 201e will drive the gear 201d to rotate, and the telescopic sleeve 201a will be driven to rise or fall through the meshing connection between the gear 201d and the rack 201b.

[0047] By repeatedly shaking the rotating rod 202a-2, the telescopic component 201 can be quickly raised or lowered to achieve a quick positioning effect. By placing the pipe body on the middle tube sheet of the pipe body support 202a-4, due to the long distance between the tube sheets and the long length of the pipe body itself, the pipe body support 202a-4 is used to assist in positioning and support the pipe body to improve the efficiency of pipe threading and welding. The pipe body is connected by welding, and the stability of the pipeline after connection is improved by colloid. The pipe body is repeatedly alternated from top to bottom and then from bottom to top in a serpentine sequence to achieve quick pipe threading and welding.

[0048] By rotating the hose bracket 202a-6 with the connecting axis in the hose connecting seat 202a-5 as the axis, the staff can quickly locate and facilitate circular gluing to prevent incorrect or uneven coating. The area to be glued is repeatedly alternated from top to bottom and then from bottom to top in a serpentine sequence to achieve rapid gluing.

[0049] It should be noted that the initial positions of the two groups of trigger rods 202f are staggered with the positions of the fixed brackets 202a-3, that is, the initial positions of the trigger rods 202f and the fixed brackets 202a-3 are not parallel. When in use, the rotating rod 202a-2 needs to be shaken 360° each time and the fixed brackets 202a-3 are perpendicular to the ground and the hose bracket 202a-6 is close to the side of the air preheater tube replacement glue area, and when the rotating rod 202a-2 is shaken 360°, only one side of the one-way wheel 202c will rotate 360° and the trigger rod 202f fixedly connected to the one-way wheel 202c will touch the arc-shaped trigger strip 201k once, and the ratchet 201h will be touched once. When the driving wheel 201f is driven to rotate and the gear 201d is driven to rotate, the gear 201d drives the driving shaft 201e to move a distance that is the same as the distance between the tube sheet and the pipe connection port, and the driving wheel 201f will simultaneously touch the upper end of the telescopic clamping column 201g when it is touched and rotated, causing the upper end of the telescopic clamping column 201g to shrink and pop out when the driving wheel 201f rotates to the next set of inter-tooth gaps to achieve the function of positioning the rotation angle of the driving wheel 201f to prevent the rotation angle from deviating. The driving wheel 201f can be adjusted to set five or six groups of teeth according to the actual rotation angle and can simultaneously adapt to adjusting the height of the ratchet 201h and the arc-shaped trigger bar 201k.

[0050] In summary, the present invention adopts sealant to replace the pipes of the air preheater, and uses a supporting device to assist in the gluing and pipe replacement operations, which can shorten the maintenance period, reduce the material cost and labor cost, and avoid construction workers working in a high-risk working environment for a long time, thereby ensuring the safety of the workers. The sealant solves the problem of air leakage in the pipes of the air preheater and improves the stability of the air preheater.

[0051] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0052] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0053] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A sealing support device for the cold end heat exchange tube of a tubular air preheater, characterized in that: include, A base unit (100) comprises a moving component (101) and a supporting component (102) arranged on the upper part of the moving component (101); The adjustment unit (200) comprises a telescopic component (201) and a rotating component (202) arranged on the upper part of the telescopic component (201); The rotating assembly (202) comprises a rotating frame (202a), a supporting column (202b) rotatably connected to the rotating frame (202a), a one-way wheel (202c) arranged on both sides of the supporting column (202b), a telescopic spring tooth (202d) arranged in the inner cavity of the one-way wheel (202c), a latch tooth (202e) arranged in the inner cavity of the one-way wheel (202c) and adapted to the telescopic spring tooth (202d), and a trigger rod (202f) fixedly connected to the circular outer wall of the one-way wheel (202c); The rotating frame (202a) comprises a rotating shaft (202a-1), a rotating rod (202a-2) fixedly connected to one end of the rotating shaft (202a-1), four groups of fixed brackets (202a-3) fixedly connected to the other end of the rotating shaft (202a-1), a tube bracket (202a-4) fixedly connected to the fixed bracket (202a-3), a hose connecting seat (202a-5) fixedly connected to the fixed bracket (202a-3), and a hose bracket (202a-6) rotatably connected to the hose connecting seat (202a-5); The tube body support (202a-4) is used to place the air preheater tube to be replaced, and the hose support (202a-6) is used to place the sealing hose.

2. The sealing support device for the cold end heat exchange tube of a tubular air preheater according to claim 1, characterized in that: The moving component (101) comprises a universal wheel (101a).

3. The sealing support device for the cold end heat exchange tube of a tubular air preheater according to claim 2, characterized in that: The support assembly (102) comprises a support base (102a) and a support round seat (102b) arranged on the upper part of the support base (102a).

4. The sealing support device for the cold end heat exchange tube of a tubular air preheater according to claim 3, characterized in that: The telescopic assembly (201) comprises a telescopic sleeve (201a), a rack (201b) fixedly connected to the upper part of the supporting round seat (102b), a sliding column (201c) symmetrically arranged with the rack (201b) relative to the supporting round seat (102b), a gear (201d) rotatably connected to the telescopic sleeve (201a), a driving shaft (201e) fixedly connected to the gear (201d), driving wheels (201f) symmetrically arranged on both sides of the gear (201d), and a gear (201c) arranged on the supporting round seat (102b). A telescopic clamping column (201g) at the lower part of the driving wheel (201f), a ratchet (201h) arranged on one side of the driving wheel (201f), a connecting plate (201i) rotatably connected to the ratchet (201h), a connecting rod (201j) fixedly connected to the upper part of the connecting plate (201i), an arc-shaped triggering strip (201k) fixedly connected to one side of the connecting rod (201j), and a return spring (201l) having one end connected to the telescopic sleeve (201a) and the other end connected to the connecting plate (201i).

5. The sealing operation support device for the cold end heat exchange tube of a tubular air preheater according to claim 4: the ratchet (201h) is adapted to the driving wheel (201f), and the gear (201d) is meshingly connected to the rack (201b).

6. The sealing support device for the cold end heat exchange tube of a tubular air preheater according to claim 5, characterized in that: The one-way wheel (202c) is rotationally connected to the supporting column (202b), the telescopic spring tooth (202d) is adapted to the latch tooth (202e), and the telescopic spring tooth (202d) is fixedly connected to one side of the rotating shaft (202a-1).

7. The sealing support device for the cold end heat exchange tube of a tubular air preheater according to claim 6, characterized in that: The upper portion of the universal wheel (101a) is fixedly connected to the lower portion of the support base (102a), and the drive shaft (201e) is fixedly connected to the drive wheel (201f).

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