Warm pipe steam recovery assembly for steam turbine

Abstract

The utility model relates to the technical field of steam recovery, in particular to a warm pipe steam recovery assembly for a steam turbine, which comprises a warm pipe steam recovery assembly body, the warm pipe steam recovery assembly body comprises a steam heat energy recovery tank, the steam heat energy recovery tank comprises a cylinder wall, and the cylinder wall forms a main body structure of the assembly. Heat exchange pipes are arranged in the cylinder wall, are uniformly distributed along the inner circumference of the cylinder wall and are used for realizing heat exchange between steam and a medium; sealing heads are arranged at the two ends of the cylinder wall respectively and are connected with the cylinder wall in a welding manner to form a closed recovery chamber; according to the steam heat energy recovery tank, the structural design of the steam heat energy recovery tank is optimized, and the structures such as the pull rod, the baffle plate and the expansion joint and the structures such as the filter screen layer, the air outlet reinforcing ring and the sealing washer are arranged, so that the heat exchange efficiency, the equipment stability and the filtering efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of steam recovery technology, and in particular to a steam recovery assembly for a steam turbine. Background Technology

[0002] With the rapid development of industrial production, efficient energy utilization has become an important goal for enterprises. During steam turbine operation, the recovery and utilization of warm-up steam is crucial for improving energy efficiency and reducing energy waste. Traditional steam recovery methods often suffer from large heat losses and low recovery efficiency, failing to meet the requirements of modern industrial production for high efficiency, energy saving, and environmental protection.

[0003] In the current industrial field, some steam recovery technologies for steam turbines with warm-up pipes already exist, but these technologies still have some shortcomings in practical applications. For example, the structural design of some recovery components is not reasonable enough, resulting in low heat exchange efficiency between steam and the medium and significant heat loss. At the same time, during steam flow, the heat exchange tubes of some components are easily damaged by vibration or impact, affecting the stability and service life of the recovery components. Furthermore, the impact of temperature changes on the cylinder wall is also one of the problems that needs to be addressed in existing technologies. When temperature changes occur, the cylinder wall of some recovery components is prone to thermal deformation, leading to decreased sealing performance and even safety accidents. Utility Model Content

[0004] To address some of the problems existing in the prior art, this utility model provides a steam recovery assembly for steam turbine warm-up pipes, which solves the problems of low steam recovery efficiency, large heat loss, and poor equipment stability in the prior art.

[0005] To achieve the above objectives, this utility model provides a warm-up steam recovery assembly for a steam turbine, comprising a warm-up steam recovery assembly body, wherein the warm-up steam recovery assembly body includes a steam heat energy recovery tank, the steam heat energy recovery tank includes a cylindrical wall, the cylindrical wall constitutes the main structure of the assembly, and heat exchange tubes are arranged inside, which are evenly distributed along the inner circumference of the cylindrical wall to realize heat exchange between steam and medium; end caps are respectively provided at both ends of the cylindrical wall, and the end caps are welded to the cylindrical wall to form a closed recovery chamber; an air inlet flange is provided on the cylindrical wall for connecting the steam inlet pipe.

[0006] As a further improvement of this utility model, in order to ensure the stability of the heat exchange tube during the steam flow process and avoid damage caused by vibration or impact, the heat exchange tube is equipped with a tie rod and a baffle plate, and is fixed inside the cylinder wall by the tie rod and the baffle plate to ensure that the heat exchange tube remains stable during the steam flow process; the baffle plate is arranged at equal intervals along the axial direction of the cylinder wall, and a heat-conducting medium is filled between adjacent heat exchange tubes.

[0007] As a further improvement of this utility model, in order to compensate for the thermal deformation of the cylinder wall caused by temperature changes and ensure the safety of the equipment during long-term use, an expansion joint is provided on the cylinder wall to compensate for the thermal deformation of the cylinder wall caused by temperature changes. The cylinder wall is provided with lifting lugs and lifting holes. The material of the expansion joint is the same as that of the cylinder wall. The inner surface of the cylinder wall is coated with a heat-reflective coating.

[0008] As a further improvement of this utility model, in order to ensure that the recovered steam can be discharged smoothly and avoid the accumulation and waste of steam in the recovery tank, the end cap is provided with an outlet pipe and an outlet flange. The outlet pipe is connected to the outlet flange and is used to discharge the recovered steam from the assembly. An outlet reinforcing ring is provided around the outlet pipe.

[0009] As a further improvement of this utility model, in order to filter out impurities and particulate matter in the steam and avoid damage to heat exchange tubes and other equipment caused by impurities and particulate matter, the inlet pipe flange connection is provided with an inlet pipe for introducing the steam to be recovered; the inlet pipe is provided with a filter layer inside, and the filter layer adopts a multi-stage stacked structure design.

[0010] As a further improvement to this utility model, in order to facilitate connection with other pipelines and ensure the airtightness of the recovery tank to prevent steam leakage, pipe welds are provided on both sides of the end caps of the steam heat energy recovery tank, and sealing gaskets are also provided inside the end caps. An inlet tube sheet and tube sheet flange are provided on the end cap of the steam heat energy recovery tank near the air inlet.

[0011] The workflow of this utility model is as follows:

[0012] Steam is introduced into the steam heat recovery tank via an inlet flange connected to an inlet pipe. The inlet pipe contains a multi-stage stacked filter layer designed to remove impurities and particulate matter from the steam, ensuring that the steam entering the recovery tank is pure and free of impurities, thus preventing blockage or wear on the heat exchange tubes.

[0013] After steam enters the heat exchange tubes, it begins to exchange heat with the medium outside the tubes. The heat exchange tubes are evenly distributed along the inner circumference of the tube wall. This arrangement ensures sufficient contact between the steam and the medium, thereby maximizing heat exchange efficiency. The steam flowing inside the heat exchange tubes releases heat to the external medium, which absorbs the heat and its temperature rises, achieving the purpose of preheating or heating. At the same time, the steam cools down due to the release of heat, and some of the steam may condense into water, realizing the recovery of the steam's thermal energy.

[0014] The heat exchange tubes are fixed within the cylinder wall by tie rods and baffles, ensuring stability during steam flow. The baffles are evenly spaced along the cylinder wall's axial direction, enhancing not only the stability of the heat exchange tubes but also promoting uniform steam distribution among them. A heat-conducting medium is filled between adjacent heat exchange tubes, further improving heat exchange efficiency and ensuring that the steam's thermal energy is fully transferred to the medium.

[0015] As heat exchange occurs between steam and the medium, the cylinder wall undergoes thermal deformation due to temperature changes. To compensate for this deformation, expansion joints are installed on the cylinder wall. These expansion joints can freely expand and contract with the thermal expansion and contraction of the cylinder wall, thus preventing damage to the cylinder wall due to excessive stress.

[0016] The inner surface of the cylinder wall is coated with a heat-reflective coating, which reflects some of the heat back to the medium, further improving heat exchange efficiency. At the same time, the heat-reflective coating also protects the cylinder wall from direct erosion by high-temperature steam, extending its service life.

[0017] After heat exchange, most of the heat energy in the steam is absorbed by the medium, and the remaining steam and condensate are discharged from the steam heat recovery tank through the outlet pipe. The outlet pipe is connected to the outlet flange to ensure smooth steam discharge from the assembly. An outlet reinforcement ring is installed around the outlet pipe to enhance the strength of the pipe area and prevent damage due to excessive steam pressure. Simultaneously, a sealing gasket is installed inside the end cap to ensure the airtightness of the steam heat recovery tank and prevent steam leakage.

[0018] The beneficial effects of this utility model are as follows:

[0019] I. High-efficiency heat energy recovery

[0020] The heat exchange tubes installed inside the steam heat recovery tank achieve highly efficient heat exchange between steam and the medium. The heat exchange tubes are evenly distributed along the inner circumference of the tank wall, maximizing the heat exchange area and improving heat exchange efficiency. Simultaneously, the heat exchange tubes are fixed in conjunction with tie rods and baffles, ensuring stability during steam flow and further enhancing the heat exchange effect. This design allows for the full recovery of thermal energy from the steam, converting it into usable energy and thus improving energy utilization.

[0021] II. Stable and reliable structure

[0022] The steam heat recovery tank has end caps at both ends of its cylindrical wall, which are welded to the wall to form a sealed recovery chamber, ensuring the safety and stability of the steam during the recovery process. Furthermore, expansion joints on the cylindrical wall compensate for thermal deformation caused by temperature changes, preventing structural damage due to thermal deformation. Lifting lugs and holes on the exterior of the cylindrical wall facilitate the hoisting and transportation of the components, improving installation convenience.

[0023] III. Enhancing heat exchange efficiency

[0024] The spaces between adjacent heat exchange tubes are filled with a heat-conducting medium, which further enhances heat exchange efficiency and ensures that the heat energy in the steam is fully absorbed. Simultaneously, baffles are evenly spaced along the axial direction of the cylinder wall, guiding the steam to form vortices inside the recovery tank, increasing the contact area and time between the steam and the heat exchange tubes, thereby improving heat exchange efficiency. This design not only improves heat recovery efficiency but also makes the components more stable and reliable during operation. Attached Figure Description

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a structural diagram of the present invention.

[0027] Figure 2 This is a diagram showing the arrangement of the heat exchange tubes.

[0028] The components include: 1. Steam heat recovery tank; 2. Cylinder wall; 3. Heat exchange tube; 4. End cap; 5. Inlet flange; 6. Tie rod; 7. Baffle plate; 8. Heat transfer medium; 9. Expansion joint; 10. Lifting lug; 11. Lifting hole; 12. Heat reflective coating; 13. Outlet pipe; 14. Outlet flange; 15. Outlet reinforcing ring; 16. Inlet pipe; 17. Filter layer; 18. Pipe weld; 19. Sealing gasket; 20. Inlet tube sheet; 21. Tube sheet flange. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions in this application, the following description is provided in conjunction with the appendix. Figure 1-2 The present invention will be further described below. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and should not be used to limit the protection scope of the present invention.

[0030] like Figure 1-2 The diagram shows a steam recovery assembly for a steam turbine, comprising a steam recovery assembly body, which includes a steam heat recovery tank 1, and a cylindrical wall 2. The cylindrical wall 2 forms the main structure of the assembly, and heat exchange tubes 3 are installed inside the cylindrical wall 2. The heat exchange tubes 3 are evenly distributed along the inner circumference of the cylindrical wall 2 to realize heat exchange between steam and the medium. End caps 4 are respectively provided at both ends of the cylindrical wall 2, and the end caps 4 are welded to the cylindrical wall 2 to form a closed recovery chamber. An air inlet flange 5 is provided on the cylindrical wall 2 for connecting the steam inlet pipe.

[0031] The heat exchange tube 3 is equipped with a tie rod 6 and a baffle plate 7, and is fixed inside the cylinder wall 2 by the tie rod 6 and the baffle plate 7 to ensure that the heat exchange tube 3 remains stable during the steam flow process; the baffle plate 7 is arranged at equal intervals along the axial direction of the cylinder wall 2, and the space between adjacent heat exchange tubes 3 is filled with a heat-conducting medium 8.

[0032] An expansion joint 9 is provided on the cylinder wall 2 to compensate for thermal deformation of the cylinder wall 2 caused by temperature changes. The cylinder wall 2 is provided with a lifting lug 10 and a lifting hole 11. The expansion joint 9 is made of the same material as the cylinder wall 2. The inner surface of the cylinder wall 2 is coated with a heat-reflective coating 12.

[0033] The end cap 4 is provided with an outlet pipe 13 and an outlet flange 14. The outlet pipe 13 is connected to the outlet flange 14 and is used to discharge the recovered steam from the assembly. An outlet reinforcing ring 15 is provided around the outlet pipe 13.

[0034] The inlet flange 5 is connected to an inlet pipe 16 for introducing the steam to be recovered; the inlet pipe 16 is provided with a filter layer 17, which adopts a multi-stage stacked structure design.

[0035] Both sides of the end cap 4 of the steam heat recovery tank 1 are provided with pipe welds 18, and the inside of the end cap 4 is also provided with sealing gaskets 19. The end cap 4 of the steam heat recovery tank 1 near the air inlet is provided with an air inlet tube sheet 20 and a tube sheet flange 21.

[0036] In operation, steam is introduced into the steam heat recovery tank 1 through the inlet flange 5 and the inlet pipe 16. The inlet pipe 16 is equipped with a multi-stage stacked filter layer 17. This design aims to filter out impurities and particulate matter in the steam, ensuring that the steam entering the recovery tank is pure and free of impurities, and avoiding blockage or wear on the heat exchange tube 3.

[0037] After steam enters the heat exchange tube 3, it begins to exchange heat with the medium outside the tube. The heat exchange tubes 3 are evenly distributed along the inner circumference of the cylinder wall 2. This arrangement ensures sufficient contact between the steam and the medium, thereby maximizing heat exchange efficiency. The steam flowing inside the heat exchange tube 3 releases heat to the external medium, which absorbs the heat and its temperature rises, achieving the purpose of preheating or heating. At the same time, the steam cools down due to the release of heat, and some of the steam may condense into water, realizing the recovery of the steam's thermal energy.

[0038] The heat exchange tubes 3 are fixed inside the cylinder wall 2 by tie rods 6 and baffles 7, ensuring stability during steam flow. The baffles 7 are evenly spaced along the axial direction of the cylinder wall 2, enhancing not only the stability of the heat exchange tubes 3 but also promoting uniform steam distribution among them. A heat-conducting medium 8 is filled between adjacent heat exchange tubes 3, further improving heat exchange efficiency and ensuring that the steam's thermal energy is fully transferred to the medium.

[0039] As heat exchange occurs between steam and the medium, the cylinder wall 2 will undergo thermal deformation due to temperature changes. To compensate for this deformation, an expansion joint 9 is installed on the cylinder wall 2. The expansion joint 9 can freely expand and contract with the thermal expansion and contraction of the cylinder wall 2, thereby preventing damage to the cylinder wall 2 due to excessive stress.

[0040] The inner surface of the cylinder wall 2 is coated with a heat-reflective coating 12. This coating can reflect some of the heat back to the medium, further improving the heat exchange efficiency. At the same time, the heat-reflective coating 12 can also protect the cylinder wall 2 from direct corrosion by high-temperature steam, extending the service life of the cylinder wall 2.

[0041] After heat exchange, most of the heat energy in the steam is absorbed by the medium, and the remaining steam and condensate are discharged from the steam heat recovery tank 1 through the outlet pipe 13. The outlet pipe 13 is connected to the outlet flange 14 to ensure that the steam can be smoothly discharged from the assembly. An outlet reinforcing ring 15 is installed around the outlet pipe 13 to enhance the strength of the pipe area and prevent damage due to excessive steam pressure. At the same time, a sealing gasket 19 is also installed inside the end cap 4 to ensure the airtightness of the steam heat recovery tank 1 and prevent steam leakage.

[0042] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A warm-up steam recovery assembly for a steam turbine comprising a warm-up steam recovery assembly body, characterised in that, The warm pipe steam recovery assembly body comprises a steam heat energy recovery tank (1), the steam heat energy recovery tank (1) comprises a cylinder wall (2), the cylinder wall (2) constitutes the main structure of the assembly, and a heat exchange pipe (3) is arranged in the cylinder wall (2) and is uniformly distributed along the inner periphery of the cylinder wall (2) and is used for realizing heat exchange between steam and medium;The cylinder wall (2) is provided with a head (4) at both ends, the head (4) is welded with the cylinder wall (2), and a closed recovery chamber is formed;The cylinder wall (2) is provided with an air inlet pipe flange (5) for connecting the steam inlet pipe.

2. A warm-up steam recovery assembly for a steam turbine as claimed in claim 1, wherein The heat exchange pipe (3) is matched with a pull rod (6) and a baffle (7), and is fixed in the cylinder wall (2) through the pull rod (6) and the baffle (7), so that the heat exchange pipe (3) can keep stable during steam flow;The baffle (7) is arranged at equal intervals along the axial direction of the cylinder wall (2), and a heat conducting medium (8) is arranged between adjacent heat exchange pipes (3).

3. A warm-up steam recovery assembly for a steam turbine as set forth in claim 1, characterized by The cylinder wall (2) is provided with an expansion joint (9) for compensating thermal deformation of the cylinder wall (2) caused by temperature change, the cylinder wall (2) is provided with a lifting lug (10) and a lifting hole (11) outside, the expansion joint (9) is made of the same material as the cylinder wall (2), and the inner surface of the cylinder wall (2) is coated with a heat reflecting coating (12).

4. A warm-up steam recovery assembly for a steam turbine as set forth in Claim 1, characterized by The head (4) is provided with an air outlet pipe (13) and an air outlet flange (14), the air outlet pipe (13) is connected with the air outlet flange (14), and the recovered steam is discharged from the assembly;The air outlet pipe (13) is provided with an air outlet reinforcing ring (15) around.

5. A warm-up steam recovery assembly for a steam turbine as defined in claim 1, wherein The air inlet pipe flange (5) is connected with an air inlet pipe (16) for introducing the steam to be recovered;The air inlet pipe (16) is provided with a filter screen layer (17) inside, and the filter screen layer (17) adopts a multi-stage stacking structure.

6. A warm-up steam recovery assembly for a steam turbine as set forth in Claim 1, characterized by The head (4) on both sides of the steam heat energy recovery tank (1) is provided with a pipe welding seam (18), the inside of the head (4) is further provided with a sealing gasket (19), and the head (4) on the side close to the air inlet of the steam heat energy recovery tank (1) is provided with an air inlet pipe plate (20) and a pipe plate flange (21).

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