Drainage device for shaft seal steam return pipeline
By installing a drain pipe and a condensate collection system at the bottom of the U-tube of the shaft seal return steam pipeline, the problem of poor steam return caused by water accumulation in the shaft seal return steam pipeline was solved, and the pipeline was unobstructed and efficiency was improved.
Patent Information
- Application Number
- CN202422973956.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-04
AI Technical Summary
In the steam turbine's shaft seal return steam pipe, water easily accumulates at the lowest point of the U-tube, leading to poor steam return.
Drain pipes are set at the bottom of the U-tube structure of the high-pressure, medium-pressure and low-pressure return steam pipes, and are equipped with a condensate collection system, including a condensate collection pump, a regulating valve and a water level detector. The accumulated water is discharged through the drain pipes, and the condensate collection pump is used to maintain water level balance to avoid steam loss.
Effectively evacuate the water accumulated in the U-tube, ensure smooth return steam flow, avoid steam loss, and improve the operating efficiency and safety of the shaft sealing system.
Smart Images
Figure CN223482726U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drainage technology for shaft seal return steam pipelines, specifically a drainage device for shaft seal return steam pipelines. Background Technology
[0002] The shaft seal return steam pipeline is part of the turbine shaft seal system, and its main function is to recover the mixture of steam and air leaking from the shaft seal. In the high-pressure section of the turbine, the main function of the shaft seal is to prevent steam leakage to ensure high turbine efficiency; while in the low-pressure section, the shaft seal prevents outside air from entering the turbine, ensuring the highest possible vacuum. The shaft seal return steam pipeline guides this mixture of gases to the shaft seal cooler (also known as the shaft seal heater or shaft heater), where the steam condenses into water, while the non-condensable gases are discharged outside the plant by a fan or to a designated location through a dedicated pipeline.
[0003] During operation, the maintenance of the shaft seal return steam pipeline is particularly important to ensure the normal operation of the shaft seal system and the high efficiency and safety of the steam turbine. However, since the high-pressure, medium-pressure, and low-pressure shaft seal return steam pipelines are U-shaped pipes, water accumulation is likely to occur at the lowest point of the U-shaped pipe, resulting in poor steam return.
[0004] To address the aforementioned issues, we propose a shaft seal return steam pipeline drainage device. Utility Model Content
[0005] To address the problems in the background art, this utility model provides a shaft seal return steam pipeline drainage device.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0007] A shaft seal return steam pipeline drainage device includes a high-pressure return steam pipeline, a medium-pressure return steam pipeline, and a low-pressure return steam pipeline. The high-pressure return steam pipeline, the medium-pressure return steam pipeline, and the low-pressure return steam pipeline are all configured as U-shaped pipe structures, and drainage pipes are connected to the bottom of the U-shaped pipe structures. Condensate collection pipes are connected to the bottom ends of the three sets of drainage pipes. A first regulating valve and a condensate collection tank are provided at the outlet end of the condensate collection pipe.
[0008] Preferably, the top of the condensate collection tank is provided with a water replenishment component, which includes a condensate collection pump. The output end of the condensate collection pump is connected to a water delivery pipe, and the water delivery pipe is connected to the condensate collection pipe.
[0009] Preferably, a water level detector is provided on the bottom inner side of each of the drainage pipes.
[0010] Preferably, a second regulating valve is provided in the middle of the water supply pipe.
[0011] Preferably, a condensate extraction pipe is provided in the middle of the inner side of the condensate collection tank, and the outlet end of the condensate extraction pipe is connected to the condensate collection pump.
[0012] Preferably, the inlet end of the condensate pump pipe is close to the inner bottom of the condensate collection tank.
[0013] Preferably, the outlet end of the water supply pipe is located to the left of the first regulating valve.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] In this solution, condensate drain pipes are installed at the bottom of the U-shaped pipe structures of the high-pressure return steam pipeline, medium-pressure return steam pipeline, and low-pressure return steam pipeline to disperse accumulated water inside the U-shaped pipes, thereby effectively preventing water accumulation inside the U-shaped pipes and causing poor steam return. At the same time, by installing a water replenishment component, the water inside the condensate drain pipes is kept at the same level as the bottom of the inner side of the U-shaped pipe structure, preventing steam from entering the condensate drain pipes during flow and causing losses. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of this utility model.
[0017] In the diagram: 1. High-pressure return steam pipeline; 2. Medium-pressure return steam pipeline; 3. Low-pressure return steam pipeline; 4. Drain pipe; 5. Water level detector; 6. Condensate collection pipe; 7. First regulating valve; 8. Condensate collection tank; 9. Condensate extraction pipe; 10. Condensate collection pump; 11. Water delivery pipe; 12. Second regulating valve. Detailed Implementation
[0018] The technical solution in this application embodiment is to solve the problems mentioned in the background art, and the overall idea is as follows:
[0019] Example: Refer to Figure 1 As shown, a shaft seal return steam pipeline drainage device of this embodiment includes a high-pressure return steam pipeline 1, a medium-pressure return steam pipeline 2, and a low-pressure return steam pipeline 3. The high-pressure return steam pipeline 1, the medium-pressure return steam pipeline 2, and the low-pressure return steam pipeline 3 are all configured as U-shaped pipe structures, and drainage pipes 4 are connected to the bottom of the U-shaped pipe structures. The bottom ends of the three sets of drainage pipes 4 are connected to condensate collection pipes 6. The outlet end of the condensate collection pipe 6 is equipped with a first regulating valve 7 and a condensate collection tank 8. The drainage pipes 4 are mainly used to disperse and guide the water accumulated at the bottom of the U-shaped pipe structure, so as to avoid water accumulation inside the U-shaped pipe structure and causing blockage of steam flow.
[0020] A water replenishment assembly is installed on the top of the condensate collection tank 8. The water replenishment assembly includes a condensate collection pump 10. The output end of the condensate collection pump 10 is connected to a water delivery pipe 11, which is connected to the condensate collection pipe 6. The condensate collected in the condensate collection tank 8 can be pumped out by the condensate collection pump 10 and then transported to the condensate collection pipe 6 through the water delivery pipe 11. This replenishes the condensate in the drain pipe 4, raising the water level to the same level as the bottom of the inner side of the U-shaped pipe structure. This prevents gas from entering the drain pipe 4 during flow and causing losses.
[0021] Water level detectors 5 are installed on the bottom inner side of each drainage pipe 4. The water level detectors 5 are mainly used to accurately detect the water level of the water stored in the drainage pipe 4.
[0022] In some examples, a second regulating valve 12 is provided in the middle of the water supply pipe 11.
[0023] In some examples, a condensate extraction pipe 9 is provided in the middle of the inner side of the condensate collection tank 8, and the outlet end of the condensate extraction pipe 9 is connected to the condensate collection pump 10.
[0024] In some examples, the inlet end of the condensate pump 9 is close to the inner bottom of the condensate collection tank 8.
[0025] In some examples, the outlet of the water supply pipe 11 is located to the left of the first regulating valve 7.
[0026] The working principle of this utility model is as follows:
[0027] A drain pipe 4 is installed at the bottom of the U-shaped pipe structure of the high-pressure return steam pipe 1, the medium-pressure return steam pipe 2, and the low-pressure return steam pipe 3. The drain pipe 4 can collect the water accumulated in the U-shaped pipe. The water level detector 5 can detect the water level of the water collected in the drain pipe 4. When the water level is higher than the threshold set by the water level detector 5 and fills the U-shaped pipe, the first regulating valve 7 opens. The water collected in the drain pipe 4 will be discharged into the condensate collection tank 8 through the condensate collection pipe 6 until the water level drops to the bottom of the U-shaped pipe and is level with the bottom of the inner side of the U-shaped pipe. At this time, the inside of the U-shaped pipe is in a smooth state, thereby maintaining the smooth return of steam in the high-pressure return steam pipe 1, the medium-pressure return steam pipe 2, and the low-pressure return steam pipe 3.
[0028] In addition, when the water level in the drain pipe 4 drops to the threshold set by the water level detector 5, in order to prevent gas from entering the drain pipe 4 and causing losses, the condensate collection pump 10 is started to extract condensate from the condensate collection tank 8 through the condensate extraction pipe 9, and then transported to the condensate collection pipe 6 through the water delivery pipe 11 until the water level in the drain pipe 4 rises to the threshold set by the water level detector 5. Then the condensate collection pump 10 and the second regulating valve 12 are closed to maintain the balance of the water level in the drain pipe 4 so that the gas can flow smoothly in the high-pressure return steam pipe 1, the medium-pressure return steam pipe 2 and the low-pressure return steam pipe 3.
[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A shaft seal return steam pipeline drain device, characterized in that, It includes a high-pressure return steam pipeline (1), a medium-pressure return steam pipeline (2) and a low-pressure return steam pipeline (3). The high-pressure return steam pipeline (1), the medium-pressure return steam pipeline (2) and the low-pressure return steam pipeline (3) are all set as U-shaped pipe structures, and a drain pipe (4) is connected to the bottom of the U-shaped pipe structure. The bottom ends of the three sets of drain pipes (4) are connected to condensate collection pipes (6). The outlet end of the condensate collection pipe (6) is equipped with a first regulating valve (7) and a condensate collection tank (8). The top of the condensate collection tank (8) is provided with a water replenishment component, which includes a condensate collection pump (10). The output end of the condensate collection pump (10) is connected to a water delivery pipe (11), which is connected to the condensate collection pipe (6).
2. The shaft seal return steam pipeline drain device according to claim 1, characterized in that, Water level detectors (5) are installed on the bottom inner side of each drainage pipe (4).
3. A shaft seal return steam pipeline drain device according to claim 2, characterized in that, A second regulating valve (12) is provided in the middle of the water supply pipe (11).
4. A shaft seal return steam pipeline drain device according to claim 3, characterized in that, A condensate pumping pipe (9) is provided in the middle of the inner side of the condensate collection tank (8), and the outlet end of the condensate pumping pipe (9) is connected to the condensate collection pump (10).
5. A shaft seal return steam pipeline drain device according to claim 4, characterized in that, The inlet end of the condensate pump (9) is close to the bottom of the inner side of the condensate collection tank (8).
6. A shaft seal return steam pipeline drain device according to claim 5, characterized in that, The outlet of the water supply pipe (11) is located to the left of the first regulating valve (7).