Steam turbine condensed water temperature reducing device

Abstract

The utility model provides a steam turbine condensed water temperature reducing device, which relates to the field of steam turbines and comprises a heat exchange copper pipe and a pipe plate, two ends of the heat exchange copper pipe penetrate through the pipe plate and are flush with the pipe plate, and a spiral link with the outer diameter smaller than the inner diameter of the heat exchange copper pipe is arranged in the heat exchange copper pipe. The heat exchange copper pipe further comprises a rotary connecting piece for maintaining stable rotation of the spiral link in the heat exchange copper pipe, the edges of the two sides of the spiral link are overlapped with two circles of different sizes in the axial projection direction of the heat exchange copper pipe, and the spiral link is prevented from generating a laminar boundary layer by changing the structure of a traditional spiral link. Therefore, the service life of the spiral link can be guaranteed, the spiral link can normally break a laminar flow boundary layer in the heat exchange copper pipe, the heat conversion efficiency is improved, and the temperature of condensed water is reduced.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a steam turbine condensate desuperheating device. Background Technology

[0002] A steam turbine, also known as a steam engine, is a rotary steam power unit. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with rows of blades, to rotate and perform work. The steam discharged from the turbine undergoes heat exchange in the condenser, forming condensate. The temperature of the condensate reflects the efficiency of heat exchange. If the condensate temperature is too high, the heat conversion efficiency is low, resulting in energy waste.

[0003] When water flows inside heat exchange copper tubes, a laminar boundary layer forms. This layer adheres tightly to the tube wall, exhibiting slow flow velocity and an orderly stratified state. This region has high thermal resistance, leading to reduced heat transfer efficiency and making it easy for scale to accumulate on the tube wall, thus hindering heat exchange. A common solution is to install a spiral ribbon inside the heat exchange copper tubes. The spiral ribbon rotates under the influence of flowing water, altering the water's flow pattern and reducing or eliminating the laminar boundary layer. This also prevents scale buildup. However, because traditional spiral ribbons have a uniform spiral structure, the water flow creates stable eddies. These eddies cause the spiral ribbon itself to also develop a laminar boundary layer, reducing its lifespan. When the spiral ribbon is damaged, it becomes difficult to break the laminar boundary layer inside the heat exchange copper tube, resulting in reduced heat conversion efficiency and consequently, an increase in condensate temperature. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a turbine condensate desuperheating device. By changing the structure of the traditional spiral ribbon, it avoids the formation of a laminar boundary layer within the spiral ribbon itself. This ensures the service life of the spiral ribbon and enables it to properly break the laminar boundary layer within the heat exchange copper tube, thereby improving heat conversion efficiency and resulting in a decrease in condensate temperature. This solves the problems mentioned in the background technology.

[0005] Technical solution

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a steam turbine condensate desuperheating device, comprising a heat exchange copper tube and a tube sheet, the two ends of the heat exchange copper tube penetrating the tube sheet and being flush with the tube sheet, the interior of the heat exchange copper tube being provided with a spiral ribbon with an outer diameter smaller than the inner diameter of the heat exchange copper tube, and also including a rotating connector for maintaining the stable rotation of the spiral ribbon inside the heat exchange copper tube, the two sides of the spiral ribbon overlapping with two circles of different sizes respectively in the axial projection direction of the heat exchange copper tube.

[0007] Furthermore, rotating connectors are provided at both ends of the spiral ribbon.

[0008] Furthermore, the rotating connector includes a bearing housing and a rotating bearing, with the inner ring of the bearing housing fixed to the outer ring of the rotating bearing, and the bearing housing fixed relative to the tube sheet.

[0009] Furthermore, the outer ring of the rotating bearing matches the inner ring of the heat exchange copper tube, and a portion of the rotating bearing is located inside the heat exchange copper tube.

[0010] Furthermore, a straight connecting support plate is fixedly connected to the end of the spiral ribbon. An expansion groove is provided on the connecting support plate, and a positioning rod passes through the expansion groove. The positioning rod is fixed relative to the inner ring of the rotating bearing.

[0011] Furthermore, a spring is installed on the inner side of the expansion groove to apply pressure to the positioning rod inside the heat exchange copper tube.

[0012] Furthermore, the two ends of the positioning rod are symmetrically provided with threads in opposite directions, and the threaded parts at both ends of the positioning rod are respectively threadedly connected to snap-fit ​​supports, and the snap-fit ​​supports are provided with snap-fit ​​grooves that cooperate with the inner ring of the rotating bearing.

[0013] The beneficial effects of this utility model are as follows:

[0014] The spiral ribbon design alters the water's operating state within the heat exchange copper tubes, reducing or eliminating the laminar boundary layer and preventing scale buildup on the tube walls, thus improving the heat transfer efficiency. Furthermore, by modifying the traditional uniform spiral structure, the spiral ribbon itself avoids generating a laminar boundary layer, ensuring its lifespan and enabling it to effectively break down the laminar boundary layer within the heat exchange copper tubes, thereby increasing heat conversion efficiency and resulting in lower condensate temperature. Compared to the traditional method of using a single-end rotating connector, the two rotating connectors enhance the spiral ribbon's rotational stability. The connecting support plate, expansion groove, positioning rod, spring, snap-fit ​​support, and snap-fit ​​groove ensure a better connection between the spiral ribbon and the rotating connectors, facilitating installation while maintaining connection stability. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the present invention;

[0016] Figure 2 The structure of this utility model Figure 1 A magnified view of a portion of the image;

[0017] Figure 3 The structure of this utility model Figure 2 Exploded view;

[0018] Figure 4 The structure of this utility model Figure 3 Enlarged view of point A;

[0019] Figure 5 The structure of this utility model Figure 3 A schematic diagram of the structure at the junction of the positioning rod and the snap-fit ​​support;

[0020] Figure 6 This is a schematic diagram of the overall structure of the spiral link;

[0021] Among them, 1. heat exchange copper tube; 2. tube sheet; 3. spiral ribbon; 4. rotating connector; 401. bearing seat; 402. rotating bearing; 5. connecting support plate; 6. expansion groove; 7. positioning rod; 8. spring piece; 9. snap-fit ​​support; 10. snap-fit ​​groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] See Figures 1-6 A steam turbine condensate desuperheating device includes a heat exchange copper tube 1 and a tube sheet 2. Both ends of the heat exchange copper tube 1 pass through the tube sheet 2 and are flush with the tube sheet 2. The heat exchange copper tube 1 is provided with a spiral ribbon 3 with an outer diameter smaller than the inner diameter of the heat exchange copper tube 1. It also includes a rotating connector 4 to maintain the stable rotation of the spiral ribbon 3 inside the heat exchange copper tube 1. The two sides of the spiral ribbon 3 overlap with two circles of different sizes in the axial projection direction of the heat exchange copper tube 1.

[0024] In this scheme: Cooling water in the inlet chamber of the condenser enters from one end of the heat exchange copper tube 1, exchanges heat with the steam, and then flows out from the other end of the heat exchange copper tube 1 and enters the outlet chamber for circulation. After heat exchange, the steam forms condensate. The spiral ribbon 3 is installed inside the heat exchange copper tube 1 through the rotating connector 4. When the cooling water flows inside the heat exchange copper tube 1, the spiral ribbon 3 can rotate under the action of the water flow. The rotating spiral ribbon 3 changes the operating state of the cooling water inside the heat exchange copper tube 1, which can reduce or eliminate the laminar boundary layer on the inner wall of the heat exchange copper tube 1 and make it difficult for dirt to remain inside the tube wall of the heat exchange copper tube 1 and form scale. However, due to the viscosity of the fluid, the fluid velocity will gradually decrease near the surface of the spiral ribbon 3, and gradually increase from zero at the surface of the spiral ribbon 3 outwards. This will form a laminar boundary layer on the surface of the spiral ribbon 3. By changing the uniform spiral structure of the traditional spiral ribbon 3, the formation of a laminar boundary layer on the spiral ribbon 3 itself can be avoided, preventing corrosion and damage to the spiral ribbon 3 itself. This will ensure the service life of the spiral ribbon 3, allowing the spiral ribbon 3 to break the laminar boundary layer inside the heat exchange copper tube 1 normally, thereby improving the heat conversion efficiency, which is manifested as a decrease in condensate temperature. The two sides of the spiral ribbon 3 overlap with two circles of different sizes in the axial projection direction of the heat exchange copper tube 1, which is non-uniform compared to the uniform spiral structure of the traditional spiral ribbon 3. This avoids the formation of a stable vortex under the rotation of the traditional spiral ribbon 3, thus breaking the stable vortex and preventing the formation of a laminar boundary layer on the traditional spiral ribbon 3 itself.

[0025] Rotary connectors 4 are provided at both ends of the spiral ribbon 3.

[0026] In this embodiment, rotating connectors 4 are provided at both ends of the spiral ribbon 3. Compared with the traditional method of providing a rotating connector 4 at only one end, the rotational stability of the spiral ribbon 3 can be improved. This is because after the spiral ribbon 3 with the traditional uniform spiral structure is changed, the spiral ribbon 3 will swing. If a rotating connector 4 is only provided at one end of the spiral ribbon 3, the rotation of the spiral ribbon 3 will not be stable enough, and it may even cause the spiral ribbon 3 to collide with the inner wall of the heat exchange copper tube 1.

[0027] The rotating connector 4 includes a bearing housing 401 and a rotating bearing 402. The inner ring of the bearing housing 401 is fixed to the outer ring of the rotating bearing 402, and the bearing housing 401 is fixed relative to the tube sheet 2.

[0028] In this embodiment: the bearing seat 401 can be fixed to the tube sheet 2 by bolts or adhesive. After the cooling water enters the heat exchange copper tube 1 and acts on the spiral belt 3, the spiral belt 3 will rotate under the action of the water flow. The spiral belt 3 is provided with a rotation base by the rotating bearing 402.

[0029] The outer ring of the rotating bearing 402 matches the inner ring of the heat exchange copper tube 1, and a portion of the rotating bearing 402 is located inside the heat exchange copper tube 1.

[0030] In this embodiment, a portion of the rotating bearing 402 is located inside the heat exchange copper tube 1, which can increase the installation stability between the rotating connector 4 and the heat exchange copper tube 1.

[0031] The end of the spiral ribbon 3 is fixedly connected to a straight connecting support plate 5. An expansion groove 6 is provided on the connecting support plate 5. A positioning rod 7 passes through the expansion groove 6. The positioning rod 7 is fixed relative to the inner ring of the rotating bearing 402.

[0032] In this embodiment: during installation, the spiral ribbon 3 is fixed to the inner ring of the rotating bearing 402 by passing the positioning rod 7 through the expansion groove 6 opened on the connecting support plate 5. The positioning rod 7 can be fixed to the inner ring of the rotating bearing 402 by welding or other methods.

[0033] The inner side of the expansion groove 6 is equipped with a spring 8 that applies pressure to the positioning rod 7 into the heat exchange copper tube 1.

[0034] In this embodiment: the expansion groove 6 not only allows the positioning rod 7 to pass through, but also provides deformation space for the spiral ribbon 3 when it undergoes slight deformation due to thermal expansion and cooling. The spring piece 8 can use its own elasticity to press the positioning rod 7 into the heat exchange copper tube 1, thereby improving the installation stability of the rotating connector 4. Furthermore, it can counteract the slight deformation of the spiral ribbon 3 when it undergoes slight deformation due to thermal expansion and cooling. The positioning rod 7 has a positioning groove, and one end of the spring piece 8 can be embedded in the positioning groove to improve the connection stability between the positioning rod 7 and the spring piece 8. Figure 4 As shown, the spring piece 8 is provided with a folded edge, and the folded edge structure is engaged with the connecting support plate 5, thereby realizing a stable connection between the spring piece 8 and the connecting support plate 5.

[0035] The positioning rod 7 has symmetrical threads in opposite directions at both ends. The threaded parts at both ends of the positioning rod 7 are respectively threaded to snap-fit ​​supports 9. The snap-fit ​​supports 9 are provided with snap-fit ​​grooves 10 that cooperate with the inner ring of the rotating bearing 402.

[0036] In this embodiment: When the spiral ribbon 3 is installed into the heat exchange copper tube 1, a rotating connector 4 can be installed at one end of the spiral ribbon 3 first, and then inserted into the heat exchange copper tube 1. After that, another rotating connector 4 is installed at the other end of the spiral ribbon 3. When the rotating connector 4 is installed with the end of the spiral ribbon 3, the positioning rod 7 is first passed through the expansion groove 6 opened on the connecting support plate 5, and one end of the spring piece 8 is embedded in the positioning groove opened on the positioning rod 7. Then, the two snap-fit ​​supports 9 are threadedly connected to the positioning rod 7 through the threaded parts at both ends of the positioning rod 7. Then, the snap-fit ​​groove 10 is aligned with the position of the inner ring of the rotating bearing 402. The positioning rod 7 is rotated. The rotation of the positioning rod 7 will drive the two snap-fit ​​supports 9 away from each other through the threads at both ends in opposite directions, until the snap-fit ​​groove 10 on the snap-fit ​​support 9 is engaged on the inner ring of the rotating bearing 402.

[0037] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0038] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A steam turbine condensate desuperheating device, comprising a heat exchange copper tube (1) and a tube sheet (2), wherein both ends of the heat exchange copper tube (1) penetrate the tube sheet (2) and are flush with the tube sheet (2), and the heat exchange copper tube (1) is provided with a spiral ribbon (3) with an outer diameter smaller than the inner diameter of the heat exchange copper tube (1), and further comprising a rotating connector (4) for maintaining the stable rotation of the spiral ribbon (3) within the heat exchange copper tube (1), characterized in that: The two sides of the spiral ribbon (3) overlap with two circles of different sizes in the axial projection direction of the heat exchange copper tube (1).

2. The turbine condensate desuperheating device according to claim 1, characterized in that: Rotary connectors (4) are provided at both ends of the spiral ribbon (3).

3. A turbine condensate desuperheating device according to claim 1 or 2, characterized in that: The rotating connector (4) includes a bearing housing (401) and a rotating bearing (402). The inner ring of the bearing housing (401) is fixed to the outer ring of the rotating bearing (402), and the bearing housing (401) is fixed relative to the tube sheet (2).

4. The turbine condensate desuperheating device according to claim 3, characterized in that: The outer ring of the rotating bearing (402) matches the inner ring of the heat exchange copper tube (1) in size, and a portion of the rotating bearing (402) is located inside the heat exchange copper tube (1).

5. The turbine condensate desuperheating device according to claim 3, characterized in that: The end of the spiral ribbon (3) is fixedly connected to a straight connecting support plate (5). An expansion groove (6) is provided on the connecting support plate (5). A positioning rod (7) passes through the expansion groove (6). The positioning rod (7) is fixed relative to the inner ring of the rotating bearing (402).

6. The turbine condensate desuperheating device according to claim 5, characterized in that: The inner side of the expansion groove (6) is equipped with a spring (8) that applies pressure to the positioning rod (7) into the heat exchange copper tube (1).

7. A turbine condensate desuperheating device according to claim 5, characterized in that: The positioning rod (7) has symmetrical threads in opposite directions at both ends. The threaded parts at both ends of the positioning rod (7) are respectively threaded to snap-fit ​​supports (9). The snap-fit ​​supports (9) are provided with snap-fit ​​grooves (10) that cooperate with the inner ring of the rotating bearing (402).

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