Super-thick-wall large-diameter header structure of power station boiler

Abstract

The utility model discloses a super-thick-wall large-diameter header structure of a power station boiler, and relates to the field of power station boiler equipment. The header comprises a large header body, a small header body and a connecting pipe, butt joints are rotatably matched with the two ends of the connecting pipe respectively, connectors are arranged on the side faces of the large header body and the small header body respectively, the connectors are matched with the butt joints, and connecting fixing plates are arranged in the connectors. According to the utility model, the connector and the butt joint adopt a multi-sealing design, and the mounting shell is matched with the threads on the outer side of the connecting shell for further fastening, so that the problem of medium leakage can be effectively reduced, the stable operation of a header system under a severe working condition is ensured, energy waste, equipment damage and safety accidents caused by leakage are reduced, and the service life of the header system is prolonged. And compared with a welding connection mode, the operation difficulty is small, and the problem that the header or the connecting pipe is scrapped due to misoperation in the installation and maintenance process can be solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power station boiler equipment technical field, specifically, relate to a power station boiler super thick wall large diameter header structure. BACKGROUND

[0002] In the power station boiler operation process, super thick wall large diameter header plays a key role for collecting and distributing high temperature and high pressure steam or flue gas, however, the existing header structure has some problems in actual use, on the one hand, under the long-term high temperature and high pressure harsh environment, the connecting place of large specification pipeline base material can appear organization aging, hardness drop, and the welding seam can also appear crack and other defects, on the other hand, in the installation and maintenance process of header, the operation difficulty of welding is big, once the welding seam appears deviation, can lead to header or connecting pipe scrap, causes huge economic loss.

[0003] Therefore we make improvement to this, propose a kind of power station boiler super thick wall large diameter header structure. UTILITY MODEL CONTENT

[0004] The utility model aims at: solve the problem of current header structure not resistant to high temperature and not easy to install.

[0005] In order to realize the above-mentioned invention purpose, the utility model provides the following technical scheme:

[0006] A kind of power station boiler super thick wall large diameter header structure to improve the above-mentioned problem.

[0007] The application is as follows:

[0008] Including: large header, small header and connecting pipe, both ends of the connecting pipe are rotatably matched with butt joint, the side of the large header and small header is equipped with connecting head, the connecting head and butt joint are matched, the connecting head is equipped with connecting fixed plate inside, the inner side of the connecting fixed plate is equipped with connecting plugging piece, the inner side of the butt joint is equipped with butt fixed plate, the inner side of the butt fixed plate is equipped with butt plugging piece, the butt fixed plate and butt plugging piece are matched, the large header and small header are multilayer composite structure, and from inside to outside, it is high temperature resistant and corrosion resistant inner layer, high strength support layer and heat insulation outer layer in sequence.

[0009] Connecting head and butt joint adopt multiple sealing design, and the thread cooperation of installation shell and connecting shell outer side further fastens, this design can effectively reduce the problem of medium leakage, ensure that header system operates stably under harsh working conditions, reduce energy waste, equipment damage and safety accidents caused by leakage, reduce maintenance cost and downtime, and compared with the connection mode of welding, the operation difficulty is smaller, can reduce the problem that header or connecting pipe is scrapped due to improper operation in installation and maintenance process.

[0010] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, the connecting head comprises connecting shells arranged on the side faces of the large header and the small header respectively, one end of the connecting shell is provided with a butt joint cavity, and the other end is provided with a mounting cavity.

[0011] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, one end of the connecting shell is provided with a sealing ring, the sealing ring is matched with the butt joint, a through hole is arranged between the butt joint cavity and the mounting cavity, a first sealing groove is arranged on one side of the inner wall of the butt joint cavity, the first sealing groove is matched with the butt joint, the connecting fixed plate is arranged on the side of the inner wall of the mounting cavity, and the connecting plugging piece is matched with the through hole.

[0012] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, the butt joint comprises a butt joint shell rotatably matched with the connecting pipe, the outer side of the butt joint shell is provided with a mounting shell, and one side of the inner wall of the mounting shell is provided with a second sealing groove matched with the sealing ring.

[0013] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, the inner side of the mounting shell is threadedly matched with the outer side of the connecting shell, one end of the butt joint shell is provided with a sealing ring matched with the first sealing groove, one end of the butt joint shell is provided with a mounting groove, one end of the mounting groove is provided with a circular through groove, the butt joint fixed plate is arranged on the inner side of the mounting groove, and the butt joint plugging piece is matched with the circular through groove.

[0014] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, the connecting plugging piece comprises a plurality of first fixed blocks fixedly connected with the connecting fixed plate, and a first plugging shell is arranged between the plurality of first fixed blocks.

[0015] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, one end of the first plugging shell is provided with a first movable hole, a first sliding rod is slidably matched in the first movable hole, one end of the first sliding rod is provided with a first limiting block, the other end of the first sliding rod is provided with a first plugging block, a first buffer block is arranged on the first plugging block, a first spring is arranged between the first plugging block and the first plugging shell, and the first plugging block is matched with the through hole.

[0016] As a preferred implementation form of the power station boiler super-thick wall large-diameter header structure provided by the utility model, the butt joint plugging piece comprises a plurality of second fixed blocks fixedly connected with the butt joint fixed plate, a second plugging shell is arranged between the plurality of second fixed blocks, a second movable hole is formed in one end of the second plugging shell, a second sliding rod is slidably arranged in the second movable hole, a second limiting block is arranged at one end of the second sliding rod, a second plugging block is arranged at the other end of the second sliding rod, a second buffer block is arranged on the second plugging block, a second spring is arranged between the second plugging block and the second plugging shell, and the second plugging block is matched with the circular through groove.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] 1、The utility model discloses a connecting head and butt joint are adopted multiple sealing design, and the further fastening of the thread cooperation of the installation shell and the connecting shell outside, this design can effectively reduce the medium leakage problem, ensure that the header system is stable under the bad working condition Run, reduce the energy waste, equipment damage and safety accident caused by leakage, reduce maintenance cost and downtime, and compared with the welding connection mode, the operation difficulty is smaller, can reduce the problem that the header or connecting pipe is scrapped due to improper operation in the installation and maintenance process.

[0019] 2、The multilayer composite structure of big header and small header plays different advantages, the high temperature resistant and corrosion resistant inner layer adopts the special alloy material containing chromium, nickel and other elements, the compact oxide film formed by chromium element can effectively resist medium corrosion, and the nickel element enhances the high temperature stability of the alloy, so that the inside of the header is not quickly corroded under the bad working condition, the high-strength supporting layer is made of high-strength alloy steel material, has high yield strength and tensile strength, can bear the internal medium pressure and external mechanical stress, and guarantees the integrity of the header structure, and the heat insulation outer layer selects ceramic fiber heat insulation material, which effectively blocks heat transfer with very low thermal conductivity, reduces heat loss, improves energy utilization efficiency, reduces the external temperature of the header, and guarantees the safety of surrounding equipment and personnel. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The utility model provides a three-dimensional structure schematic diagram of power station boiler super-thick wall large-diameter header structure for the utility model;

[0021] Figure 2 The utility model provides a connecting structure section schematic diagram of power station boiler super-thick wall large-diameter header structure for the utility model;

[0022] Figure 3 The utility model provides a connecting head section structure schematic diagram of power station boiler super-thick wall large-diameter header structure for the utility model;

[0023] Figure 4The butt joint cross section structure schematic diagram of the super-thick wall and large-diameter header structure of the power plant boiler is provided for the present application.

[0024] Figure 5 The connection plugging piece structure schematic diagram of the super-thick wall and large-diameter header structure of the power plant boiler is provided for the present application.

[0025] Figure 6 The butt joint plugging piece structure schematic diagram of the super-thick wall and large-diameter header structure of the power plant boiler is provided for the present application.

[0026] Figure 7 The large header and small header cross section structure schematic diagram of the super-thick wall and large-diameter header structure of the power plant boiler is provided for the present application.

[0027] Indicated in the figure:

[0028] 1, large header; 2, small header; 3, connecting head; 301, connecting shell; 302, butt joint cavity; 303, first sealing groove; 304, sealing ring; 305, mounting cavity; 306, through hole; 4, butt joint; 401, mounting shell; 402, second sealing groove; 403, butt joint shell; 404, sealing ring; 405, mounting groove; 406, circular through groove; 5, connecting pipe; 6, connecting fixed plate; 7, connecting plugging piece; 701, first fixed block; 702, first plugging shell; 703, first movable hole; 704, first sliding rod; 705, first limiting block; 706, first plugging block; 707, first buffer block; 708, first spring; 8, butt joint fixed plate; 9, butt joint plugging piece; 901, second fixed block; 902, second plugging shell; 903, second movable hole; 904, second sliding rod; 905, second limiting block; 906, second plugging block; 907, second buffer block; 908, second spring; 10, high-temperature-resistant and corrosion-resistant inner layer; 11, high-strength support layer; 12, heat-insulating outer layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments.

[0030] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but only represents some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0031] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0032] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and thus, once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings.

[0033] In the description of the utility model, it should be noted that the position or location relationship indicated by the terms such as 'upper', 'lower' is based on the position or location relationship shown in the drawings, or the position or location relationship commonly placed when the product is used, or the position or location relationship commonly understood by the person skilled in the art, and such terms are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the indicated device or element must have a specific position, be constructed and operated in a specific position, and thus cannot be understood as limiting the utility model. In addition, the terms 'first','second', etc. are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0034] As described in the background, in the operation process of the power station boiler, the super-thick wall large-diameter header plays a key role for collecting and distributing high-temperature and high-pressure steam or flue gas, however, the existing header structure has some problems in actual use, on the one hand, the material of the header is easy to age and damage in the long-term harsh environment of high temperature and high pressure, affecting the service life and safety, for example, the parent material of the large-specification pipeline may appear organizational aging and hardness drop, and cracks may also appear in the weld, etc. Excessive defects, on the other hand, the welding operation is difficult in the installation and maintenance process of the header, and once the weld deviates, the header or the connecting pipe may be scrapped, causing huge economic losses.

[0035] In order to solve this technical problem, the utility model provides a kind of super-thick wall large-diameter header structure of power station boiler.

[0036] Specifically, please refer to Figures 1-7 The super-thick wall large-diameter header structure of power station boiler specifically includes: a large header 1, a small header 2 and a connecting pipe 5, both ends of the connecting pipe 5 are rotatably matched with a butt joint 4, the side surface of the large header 1 and the small header 2 is equipped with a connecting joint 3, the connecting joint 3 and the butt joint 4 are matched, the connecting joint 3 is equipped with a connecting fixed plate 6 inside, the inner side of the connecting fixed plate 6 is equipped with a connecting plugging piece 7, the inner side of the butt joint 4 is equipped with a butt joint fixed plate 8, the inner side of the butt joint fixed plate 8 is equipped with a butt joint plugging piece 9, the butt joint fixed plate 8 and the butt joint plugging piece 9 are matched, the large header 1 and the small header 2 are a multi-layer composite structure, from inside to outside, it is high-temperature-resistant and corrosion-resistant inner layer 10, high-strength support layer 11 and heat-insulating outer layer 12 in turn.

[0037] The connecting head 3 and the counter connecting head 4 adopt a multiple sealing design, and the threaded cooperation of the mounting shell 401 and the outer side of the connecting shell 301 is further fastened, which can effectively reduce the medium leakage problem, ensure the stable operation of the header system under harsh working conditions, reduce the energy waste, equipment damage and safety accidents caused by leakage, reduce the maintenance cost and downtime, and compared with the welding connection mode, the operation difficulty is smaller, and the problems of the header or the connecting pipe being scrapped due to improper operation in the installation and maintenance process can be reduced.

[0038] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings.

[0039] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0040] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0041] Please refer to Figures 1-7The utility model provides a kind of power station boiler super-thick wall large-diameter header structure, comprising: big header 1, small header 2 and connecting pipe 5, both ends of connecting pipe 5 are rotatably matched with butt joint 4, the side of big header 1 and small header 2 is equipped with connecting head 3, connecting head 3 and butt joint 4 are matched, connecting fixed plate 6 is equipped in connecting head 3, the inner side of connecting fixed plate 6 is equipped with connecting plugging 7, the inner side of butt joint 4 is equipped with butt fixed plate 8, the inner side of butt fixed plate 8 is equipped with butt plugging 9, butt fixed plate 8 and butt plugging 9 are matched, big header 1 and small header 2 are multilayer composite structure, from inside to outside in turn are high temperature resistant corrosion resistant inner layer 10, high-strength support layer 11 and heat-insulating outer layer 12;Wherein, high temperature resistant corrosion resistant inner layer 10 is made of special alloy material containing chromium, nickel and other elements, high-strength support layer 11 is high-strength alloy steel material, heat-insulating outer layer 12 uses ceramic fiber heat-insulating material.Connecting head 3 includes the connecting shell 301 equipped in the side of big header 1 and small header 2 respectively, one end of connecting shell 301 is provided with butt cavity 302, the other end is provided with installation cavity 305.One end of connecting shell 301 is equipped with sealing ring 304, sealing ring 304 is matched with butt joint 4, through hole 306 is opened between butt cavity 302 and installation cavity 305, first sealing groove 303 is opened on the side of butt cavity 302 inner wall, first sealing groove 303 is matched with butt joint 4, connecting fixed plate 6 is equipped in the side of installation cavity 305 inner wall, connecting plugging 7 is matched with through hole 306.Butt joint 4 includes the butt shell 403 rotatably matched with connecting pipe 5, the outer side of butt shell 403 is equipped with installation shell 401, the inner wall of installation shell 401 is equipped with second sealing groove 402 matched with sealing ring 304.The inner side of installation shell 401 is threadedly matched with the outer side of connecting shell 301, the one end of butt shell 403 is equipped with sealing ring 404 matched with first sealing groove 303, the one end of butt shell 403 is equipped with installation groove 405, the one end of installation groove 405 is equipped with circular through slot 406, butt fixed plate 8 is equipped in the inner side of installation groove 405, butt plugging 9 is matched with circular through slot 406.Connecting plugging 7 includes a plurality of first fixed blocks 701 fixedly connected with connecting fixed plate 6, a plurality of first fixed blocks 701 are equipped with first plugging shell 702 between them.The one end of first plugging shell 702 is equipped with first movable hole 703, first movable hole 703 is slidably matched with first sliding rod 704, the one end of first sliding rod 704 is equipped with first limiting block 705, the other end is equipped with first plugging block 706, first plugging block 706 is equipped with first buffer block 707, first plugging block 706 and first plugging shell 702 are equipped with first spring 708 between them, first plugging block 706 is matched with through hole 306.The docking plugging piece 9 comprises a plurality of second fixing blocks 901 fixedly connected with the docking fixing plate 8, a second plugging shell 902 arranged between the plurality of second fixing blocks 901, a second movable hole 903 formed at one end of the second plugging shell 902, a second sliding rod 904 slidably fitted in the second movable hole 903, a second limiting block 905 arranged at one end of the second sliding rod 904, a second plugging block 906 arranged at the other end of the second sliding rod 904, a second buffer block 907 arranged on the second plugging block 906, a second spring 908 arranged between the second plugging block 906 and the second plugging shell 902, and the second plugging block 906 is matched with the circular through slot 406.

[0042] Implementation process: when the large header 1 and small header 2 need to be connected, the two end rotating fit butt joint 4 of the connecting pipe 5 is respectively butt joint with the connecting head 3 of the side of the large header 1 and the small header 2, the sealing ring 304 of the one end of the connecting shell 301 of the connecting head 3 is matched with the second sealing groove 402 of the inner wall of the installation shell 401 of the butt joint 4, at the same time, the sealing ring 404 of the one end of the butt joint shell 403 of the butt joint 4 is embedded into the first sealing groove 303 of the inner wall of the butt joint cavity 302 of the connecting head 3, the preliminary sealing is realized, then, the installation shell 401 is rotated to be matched with the outer side thread of the connecting shell 301, the further fastening connection and the sealing effect are enhanced, when the butt joint 4 and the connecting head 3 are butt joint, the second buffer block 907 of the butt joint sealing block 9 and the first buffer block 707 of the connecting sealing block 7 are extruded mutually, the extrusion force makes the second sliding rod 904 slide in the second movable hole 903, the elastic force of the second spring 908 is overcome, the second sealing block 906 is driven to leave the circular through slot 406;Meanwhile, the first sliding rod 704 slides in the first movable hole 703 against the elastic force of the first spring 708, and drives the first blocking block 706 to move away from the through hole 306. At this time, the medium channel between the large header 1, the small header 2 and the connecting pipe 5 is opened, and the medium can flow smoothly between the three. When it is needed to stop the medium flow, the extrusion force between the joint 4 and the connecting head 3 is released, and under the elastic force of the first spring 708 and the second spring 908, the first blocking block 706 re-blocks the through hole 306, and the second blocking block 906 re-blocks the circular through slot 406, preventing the medium from continuing to flow. During the docking and separation of the joint 4 and the connecting head 3, the first buffer block 707 on the first blocking block 706 and the second buffer block 907 on the second blocking block 906 play a buffering role, which can reduce the impact between the first blocking block 706 and the connecting fixed plate 6, and the second blocking block 906 and the docking fixed plate 8, thereby protecting the related components and prolonging the overall service life of the header structure. The multi-layer composite structure adopted by the large header 1 and the small header 2 has different functions for each layer. The high-temperature and corrosion-resistant inner layer 10 is made of special alloy material containing chromium, nickel and other elements. When the power station boiler is running, the inside of the header is full of high-temperature and high-pressure medium with corrosion. The chromium element can form a dense oxide film on the surface of the alloy, which acts as a shield to prevent the internal metal from further contacting the external corrosive medium, thereby greatly slowing down the corrosion rate. The nickel element improves the high-temperature resistance of the alloy and enhances the stability of the alloy in a high-temperature environment, making the crystal structure more stable and not easily deformed or damaged by high temperature. This ensures that the header inside will not be rapidly corroded under long-term high-temperature and high-pressure conditions with corrosion, prolonging the service life of the header. The high-strength support layer 11 is made of high-strength alloy steel. During the operation of the power station boiler, the header needs to withstand the huge pressure from the internal medium and the external mechanical stress, such as the force during installation and the stress caused by pipe vibration. High-strength alloy steel has excellent strength and toughness, which can effectively withstand these pressures and stresses. The alloy composition and organizational structure inside the material give it high yield strength and tensile strength, so that the header will not easily deform or break under high pressure, ensuring the structural integrity of the header and providing reliable structural support for the entire header. The heat-insulating outer layer 12 is made of ceramic fiber heat-insulating material. Ceramic fiber has very low thermal conductivity, making it an excellent heat-insulating material. When the header is working, the internal medium temperature is very high. If the heat is lost in large quantities, it will not only reduce energy utilization efficiency, but also may affect surrounding equipment and personnel. The ceramic fiber heat-insulating material effectively blocks the transfer of heat through its complex internal fiber structure. When heat passes through the ceramic fiber layer, it needs to be reflected and refracted multiple times, greatly increasing the path and resistance of heat transfer, thereby reducing the loss of heat from the header interior to the external environment, and playing a good heat-insulating and heat-preserving role, improving energy utilization efficiency.

[0043] The above embodiments are only used to illustrate the technical solutions described in the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, the present application is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present application is allowed. All technical solutions and improvements that do not deviate from the spirit and scope of the application are included in the scope of the claims of the present application.

Claims

1. A super-thick-walled and large-diameter header structure for a power station boiler, characterized in that: include: A large collecting box (1), a small collecting box (2) and a connecting pipe (5), both ends of the connecting pipe (5) are rotatably matched with a docking joint (4), the sides of the large collecting box (1) and the small collecting box (2) are both equipped with a connecting head (3), the connecting head (3) and the docking joint (4) are matched, a connecting fixing plate (6) is installed in the connecting head (3), the inner side of the connecting fixing plate (6) is equipped with a connecting sealing piece (7), the inner side of the docking joint (4) is equipped with a docking fixing plate (8), the inner side of the docking fixing plate (8) is equipped with a docking sealing piece (9), the docking fixing plate (8) and the docking sealing piece (9) are matched, the large collecting box (1) and the small collecting box (2) are a multi-layer composite structure, which comprises, from the inside to the outside, a high-temperature and corrosion-resistant inner layer (10), a high-strength support layer (11) and a heat-insulating outer layer (12).

2. The ultra-thick-walled, large-diameter header structure for a power station boiler according to claim 1, characterized in that: The connector (3) comprises a connection shell (301) mounted on the side of the large header (1) and the small header (2), respectively; one end of the connection shell (301) is provided with a docking cavity (302), and the other end is provided with a mounting cavity (305).

3. The ultra-thick-walled and large-diameter header structure for a power station boiler according to claim 2, characterized in that: A sealing ring (304) is installed at one end of the connecting shell (301), and the sealing ring (304) cooperates with the docking joint (4). A through hole (306) is provided between the docking cavity (302) and the installation cavity (305). A first sealing groove (303) is provided on one side of the inner wall of the docking cavity (302), and the first sealing groove (303) cooperates with the docking joint (4). The connecting fixing plate (6) is installed on the side of the inner wall of the installation cavity (305), and the connecting blocking member (7) cooperates with the through hole (306).

4. The ultra-thick-walled and large-diameter header structure for a power station boiler according to claim 3, characterized in that: The docking joint (4) comprises a docking shell (403) rotatably engaged with the connecting pipe (5), a mounting shell (401) is mounted on the outside of the docking shell (403), and a second sealing groove (402) engaging with the sealing ring (304) is provided on one side of the inner wall of the mounting shell (401).

5. The ultra-thick-walled and large-diameter header structure for a power station boiler according to claim 4, characterized in that: The inner side of the mounting shell (401) is threadedly engaged with the outer side of the connecting shell (301); one end of the docking shell (403) is provided with a sealing ring (404) that engages with the first sealing groove (303); one end of the docking shell (403) is provided with a mounting groove (405); one end of the mounting groove (405) is provided with a circular through groove (406); the docking fixing plate (8) is mounted on the inner side of the mounting groove (405); and the docking sealing member (9) engages with the circular through groove (406).

6. The ultra-thick-walled and large-diameter header structure for a power station boiler according to claim 3, characterized in that: The connection blocking member (7) comprises a plurality of first fixing blocks (701) fixedly connected to the connection fixing plate (6), and a first blocking shell (702) is installed between the plurality of first fixing blocks (701).

7. The ultra-thick-walled and large-diameter header structure for a power station boiler according to claim 6, characterized in that: A first movable hole (703) is provided at one end of the first blocking shell (702), a first sliding rod (704) is slidably engaged in the first movable hole (703), a first limiting block (705) is installed at one end of the first sliding rod (704), and a first blocking block (706) is installed at the other end, a first buffer block (707) is installed on the first blocking block (706), a first spring (708) is installed between the first blocking block (706) and the first blocking shell (702), and the first blocking block (706) is engaged with the through hole (306).

8. The ultra-thick-walled, large-diameter header structure for a power station boiler according to claim 5, characterized in that: The docking sealing member (9) includes a plurality of second fixed blocks (901) fixedly connected to the docking fixing plate (8), a second sealing shell (902) is installed between the plurality of second fixed blocks (901), a second movable hole (903) is opened at one end of the second sealing shell (902), a second sliding rod (904) is slidably engaged in the second movable hole (903), a second limiting block (905) is installed at one end of the second sliding rod (904), and a second blocking block (906) is installed at the other end, a second buffer block (907) is installed on the second blocking block (906), a second spring (908) is installed between the second blocking block (906) and the second blocking shell (902), and the second blocking block (906) is engaged with the circular through groove (406).

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