High-pressure expansion coordination structure

Abstract

The invention discloses a high-pressure expansion coordination structure, which belongs to the field of power plant heaters and comprises a shell, a header is welded on one side of the shell, one end of the header is communicated with a connecting pipe welded on the shell, and the other end of the header extends to the outside of the shell through the expansion coordination structure. A manhole is formed in the end, extending out of the shell, of the collecting box, the expansion coordination structure can achieve sealing between the collecting box and the shell and enable the collecting box to expand freely, the expansion coordination structure comprises a sliding guide pipe base arranged on the shell, and the collecting box penetrates through the shell through the sliding guide pipe base. An expansion joint is further arranged between the collecting box and the sliding guide pipe seat, the expansion joint is an omega-shaped expansion joint, and the expansion difference between the collecting box and the sliding guide pipe seat can be absorbed through the expansion joint. The high-pressure expansion coordination structure has the advantages of being simple and convenient in structure, low in cost, good in economical efficiency and excellent in quality, and the requirements for coordinating expansion and reducing cost are met.

Description

Technical Field

[0001] This invention relates to the field of power plant heater technology, and more particularly to a high-pressure expansion coordination structure. Background Technology

[0002] The header-type high-pressure heater is one of the key pieces of equipment in the regenerative system of thermal power plants, and it belongs to the category of surface heat exchangers. Currently, the header arrangement of the header-type high-pressure heater is achieved in the following way: one unit contains two headers. One end of the header is welded to the shell and the tee pipe seat. The tee is equipped with a maintenance manhole and a feedwater connection. The other end extends cantilevered to the other side of the shell. The two headers are connected by heat exchange tubes.

[0003] However, the header arrangement has a problem: during heater operation, internally, the heat exchange tubes expand due to heat, pushing the cantilever header. The cantilever header acts as a lever, transmitting the force to the weld connecting the header and the shell. Externally, the large thrust from the water supply pipe acts on the manhole tee, which also acts as a lever, transmitting the force to the weld connecting the header and the shell. The combined force of these two forces is large, which can easily lead to cracking of the weld connecting the header and the shell, causing an accident. Summary of the Invention

[0004] The purpose of this invention is to address the problem that in existing header-type high-pressure heaters, the weld connecting the header and the shell is subjected to a large resultant force, which can easily lead to cracking of the weld and cause accidents. Therefore, this invention proposes a high-pressure expansion coordination structure.

[0005] To achieve the above objectives, the present invention employs the following technology: a high-pressure expansion coordination structure, comprising a housing, a header welded to one side of the housing, one end of the header being connected to a pipe welded to the housing, and the other end of the header extending to the outside of the housing through the expansion coordination structure, wherein a manhole is provided at the end of the header extending to the outside of the housing, and the expansion coordination structure can achieve a seal between the header and the housing, and can allow the header to expand freely.

[0006] As a further description of the above technical solution: the expansion coordination structure includes a sliding guide seat disposed on the shell, the header passes through the shell through the sliding guide seat, and an expansion joint is also disposed between the header and the sliding guide seat.

[0007] As a further description of the above technical solution: the expansion joint is an Ω-shaped expansion joint, which can absorb the expansion difference between the header and the sliding guide seat.

[0008] As a further description of the above technical solution: there is a gap between the header and the sliding guide seat to accommodate the expansion displacement of the header due to temperature changes.

[0009] As a further description of the above technical solution: the connecting pipe is welded to one end of the header welded to the shell to form a second welded section, and the manhole is welded to one end of the header extending to the outside of the shell to form a second welded section.

[0010] As a further description of the above technical solution: the opening of the manhole is provided with a cover plate that can be opened and closed, and the cover plate is provided with a handle.

[0011] As a further description of the above technical solution: the shell is formed by welding high-strength carbon steel or low-alloy steel.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. Eliminating the external tee that causes large lever thrust in the traditional structure reduces external thrust, saves the cost of high-value tee, and improves production efficiency; 2. The unsupported cantilever structure was changed to a supported sliding structure, which eliminated the internal cantilever lever thrust and improved safety. 3. The placement of manholes at the sliding end improves maintenance reliability; 4. By setting an external Ω expansion joint, expansion is coordinated, and the sealing is simple, convenient, and easy to install, which greatly improves the quality of operation and maintenance. In summary, this high-pressure expansion coordination structure is characterized by its simple structure, low cost, good economy, and excellent quality, which not only coordinates expansion but also reduces costs. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure provided according to an embodiment of the present invention is shown; Figure 2 A schematic diagram of the existing container structure is shown.

[0014] Legend: 1. Shell; 2. Sliding guide seat; 3. Header; 4. Expansion joint; 5. Manhole; 6. Connecting pipe; 7. First welded section; 8. Second welded section. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] Reference Figures 1-2This embodiment provides a high-pressure expansion coordination structure, including a shell 1. The shell 1 is welded from high-strength carbon steel or low-alloy steel. A header 3 is welded to one side of the shell 1. One end of the header 3 is connected to a pipe 6 welded to the shell 1. The other end of the header 3 extends to the outside of the shell 1 through the expansion coordination structure. A manhole 5 is provided at the end of the header 3 extending to the outside of the shell 1. The pipe 6 is welded to one end of the header 3 through a second welding section 8. The manhole 5 is welded to one end of the header 3 through a first welding section 7. The expansion coordination structure can achieve a seal between the header 3 and the shell 1 and can allow the header 3 to expand freely. The expansion coordination structure includes a sliding guide seat 2 provided on the shell 1. The header 3 passes through the shell 1 through the sliding guide seat 2. An expansion joint 4 is also provided between the header 3 and the sliding guide seat 2.

[0017] In this invention, the header 3 extends towards the cantilever end and out of the housing 1. One end of the header 3 extending out of the housing 1 serves as a manhole 5. After the pipe bundle is assembled with the header 3 and fitted into the housing 1, the header 3 is welded to the manhole 5 to form a first welded section 7. A sliding guide seat 2 is installed on the side of the housing 1 away from the welded end of the header 3. The header 3 passes through the housing 1 through the sliding guide seat 2, which provides stable support for the header 3. A connecting pipe 6 for connection with the water supply pipe is welded to one end of the header 3. The weld between the connecting pipe 6 and the header 3 forms a second welded section 8. The connecting pipe 6 is welded to the housing 1, and the weld between the connecting pipe 6 and the housing 1 forms a third welded section. An expansion joint 4 is welded onto the sliding guide seat 2 and the manhole 5. The expansion joint 4 achieves a seal between the manhole 5 and the sliding guide seat 2 through its own structure, preventing leakage of the medium inside the equipment. It can also absorb the expansion difference between the header 3 and the housing 1 caused by the temperature difference by utilizing the deformation capacity of the expansion joint 4, ensuring that the sealing performance and the surrounding connection structure are not damaged when the header 3 expands freely.

[0018] It should be noted that the expansion joint 4 is an Ω-type expansion joint, which can absorb the expansion difference between the manhole 5 and the sliding guide seat 2. The Ω-type expansion joint also has a sealing function. While absorbing the expansion difference, it can tightly connect the header 3 and the sliding guide seat 2, blocking the leakage path of the medium inside the high-pressure heater.

[0019] In addition, there is a gap between the header 3 and the sliding guide seat 2 to accommodate the expansion displacement of the header 3 due to temperature changes. The gap design allows the header 3 to expand freely axially with temperature changes, avoiding the extrusion stress caused by rigid contact between the header 3 and the sliding guide seat 2, reducing the stress on the weld, and ensuring the safe operation of the structure.

[0020] In this invention, the opening of the manhole 5 is provided with an openable cover plate, and the cover plate is provided with a handle. The design of the cover plate and the handle facilitates personnel to enter and exit or tools to be inserted, thereby facilitating the maintenance of the heater's interior.

[0021] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high pressure expansion accommodating structure characterized by, The application relates to a shell (1) which is welded on one side with a header (3), one end of the header (3) is communicated with a connecting pipe (6) welded on the shell (1), the other end of the header (3) extends to the outside of the shell (1) through an expansion coordination structure, wherein the end of the header (3) extending to the outside of the shell (1) is provided with a manhole (5), the expansion coordination structure can realize the sealing between the header (3) and the shell (1) and can make the header (3) freely expand.

2. A high-pressure expansion coordination structure according to claim 1, characterized by The expansion coordination structure comprises a sliding guide pipe base (2) arranged on the shell (1), the header (3) penetrates the shell (1) through the sliding guide pipe base (2), and an expansion joint (4) is further arranged between the header (3) and the sliding guide pipe base (2).

3. A high pressure expansion accommodation structure according to claim 2, wherein The expansion joint (4) is an omega-shaped expansion joint, and the expansion joint (4) can absorb the expansion difference between the header (3) and the sliding guide pipe base (2).

4. A high-pressure expansion coordination structure according to claim 3, wherein The header (3) and the sliding guide pipe base (2) have a gap to adapt to the expansion displacement of the header (3) caused by temperature change.

5. A high pressure expansion accommodating structure according to claim 1, wherein The connecting pipe (6) is welded with one end of the header (3) welded on the shell (1) and forms a second welding section (8), and the manhole (5) is welded with the end of the header (3) extending to the outside of the shell (1) and forms a second welding section (7).

6. A high pressure expansion accommodating structure according to claim 1, wherein An openable cover plate is arranged at the opening position of the manhole (5), and a handle is arranged on the cover plate.

7. A high pressure expansion accommodating structure according to claim 1, wherein The shell (1) is welded by high-strength carbon steel or low-alloy steel.

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