Device for improving stability of stator cooling water system
By adding a new water tank and automatic water replenishment system in parallel to the generator fixed-cooling water system, the water level instability and cavitation problems caused by the small volume of the high-cooling water tank is solved, and the stability of the system and the reliability of the flow are achieved.
Patent Information
- Application Number
- CN202421768489.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The volume of the high-position fixed-cooling water tank in the existing generator fixed-cooling water system is small, which leads to unstable water level when the system leaks, insufficient pump inlet pressure, and easy cavitation, resulting in insufficient fixed-cooling water flow.
A new water tank connected in parallel is added to the existing fixed-cooling water system, and a capacity-enlarging and automatic water replenishment system is formed by adding components such as bottom and top communication pipes, isolation valves, water replenishment lines and bypass lines to maintain water level stability and prevent cavitation.
By adding water tanks and automatic water replenishment systems, the volume and stability of the system are effectively expanded, the water level is prevented from sharp drop, cavitation caused by insufficient pump inlet pressure, and the stability of the fixed cold water flow is ensured.
Smart Images
Figure CN222827102U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of generator cooling water, and more specifically, particularly to a device for increasing the stability of a cooling water system. Background Art
[0002] The generator cooling water system is a very important system in the power plant. It is responsible for providing uninterrupted cooling water to the generator stator windings and is usually equipped with generator water cut-off protection: when the cooling water flow is normal, the unit works normally. When the flow is lower than the design threshold, the unit trips after a short delay. Therefore, it is important to maintain the stability of the cooling water system. However, when the inlet pressure of the cooling water pump is insufficient, cavitation is prone to occur, resulting in insufficient cooling water flow. The pump inlet pressure is mainly determined by the water level of the high-level cooling water tank. Therefore, it becomes necessary to control the stability of the water level of the high-level cooling water tank. However, the volume of the high-level cooling water tank in the existing cooling water system is usually small. When a leak occurs in the system, the water level of the high-level cooling water tank will drop rapidly, resulting in unstable water level in the high-level cooling water tank. Utility Model Content
[0003] The utility model aims to overcome the problem that the volume of the high-level water tank of the existing generator cooling water system is small, the water level of the high-level water tank is unstable when the system leaks, and cavitation is likely to occur when the inlet pressure of the cooling water pump is insufficient, resulting in insufficient cooling water flow. The utility model aims to provide a device that is modified on the basis of the existing generator cooling water system to prevent cavitation from occurring in the pump and increase the stability of the cooling water system.
[0004] A device for increasing the stability of a cooling water system, comprising a newly added water tank, a newly added bottom connecting pipe, a newly added bottom isolating valve, a newly added top connecting pipe and a newly added top isolating valve. The newly added water tank is arranged at the side of an original high-position cooling water tank and is connected in parallel with the original high-position cooling water tank, and the installation position is at the same height as the installation position of the original high-position cooling water tank. The newly added bottom connecting pipe connects the newly added water tank with the bottom of the original high-position cooling water tank; the newly added bottom isolating valve is arranged on the newly added bottom connecting pipe. The newly added top connecting pipe connects the newly added water tank with the top of the original high-position cooling water tank, and the newly added top isolating valve is arranged on the newly added top connecting pipe.
[0005] Furthermore, it also includes a newly added water supply pipeline, which is connected to the newly added water tank and is used to replenish water for the newly added water tank. The newly added water supply pipeline is provided with a newly added water supply solenoid valve.
[0006] Furthermore, a newly added water replenishment front manual valve and a newly added water replenishment rear manual valve are also provided on the newly added water replenishment pipeline, and the newly added water replenishment front manual valve and the newly added water replenishment rear manual valve are arranged on the front and rear sides of the newly added water replenishment solenoid valve.
[0007] Furthermore, a first newly added bypass pipeline is also provided on the newly added water supply pipeline, and the first newly added bypass pipeline is provided with a newly added bypass manual valve.
[0008] Furthermore, it also includes a second newly added bypass pipeline, which is arranged at the manual door of the downcomer of the original high-position fixed cold water tank, and a newly added bypass solenoid valve is arranged on the second newly added bypass pipeline.
[0009] Furthermore, a newly added bypass front manual valve and a newly added bypass rear manual valve are also provided on the second newly added bypass pipeline, and the newly added bypass front manual valve and the newly added bypass rear manual valve are arranged on the front and rear sides of the newly added bypass solenoid valve.
[0010] Furthermore, the newly added bottom isolation valve is a manual valve.
[0011] Furthermore, the newly added top isolation valve is a manual valve.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] The capacity of the original high-position cooling water tank in the original cooling water system is relatively small. When the system leaks, the water level in the original high-position cooling water tank will drop rapidly. The device for increasing the stability of the cooling water system in the utility model is connected to a new water tank in parallel with the original high-position cooling water tank to increase stability after capacity expansion.
[0014] The newly added water supply pipeline for replenishing water in the new water tank is equipped with a newly added water supply solenoid valve, a newly added water supply front manual valve, a newly added water supply rear manual valve, and a first newly added bypass pipeline and a newly added bypass manual valve. When the water level in the newly added water tank is low, the newly added water supply solenoid valve automatically opens to replenish water, maintains the water level stable, and prevents cavitation of the water pump.
[0015] A second bypass pipeline is added at the manual door of the original high-position cooling water tank downcomer, and a new bypass solenoid valve, a new bypass front manual valve, and a new bypass back manual valve are installed. When the pump outlet flow rate decreases or the generator inlet pressure decreases, the new bypass solenoid valve will be automatically opened to increase the pump inlet pressure and prevent cavitation from occurring in the pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:
[0017] Figure 1 This is a schematic diagram of the structure of the original chilled water system.
[0018] Figure 2 It is a structural schematic diagram of an original cooling water system with a device for increasing the stability of the cooling water system in the utility model.
[0019] Figure 3 yes Figure 2 Schematic diagram of part of the structure.
[0020] In the figure: 1. Added water tank; 2. Original high-position cooling water tank; 3. Added bottom connecting pipe; 4. Added bottom isolating valve; 5. Added top connecting pipe; 6. Added top isolating valve; 7. Added water supply pipeline; 8. Added water supply solenoid valve; 9. Added manual valve before water supply; 10. Added manual valve after water supply; 11. First added bypass pipeline; 12. Added bypass manual valve; 13. Second added bypass pipeline; 14. Downcomer manual door; 15. Added bypass solenoid valve; 16. Added manual valve before bypass; 17. Added manual valve after bypass. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] A power generation company has a set of cooling water system for each generator set, such as Figure 1 As shown, the cooling water system is equipped with 2 100% capacity water pumps, 1 working and 1 standby, 2 100% capacity cooling water coolers, 1 original high-level cooling water tank 2, with a capacity of 300L. The volume of the entire cooling water system is about 4m 3 , the volume of the original high-level cooling water tank 2 is too small. It is equipped with generator water cut-off protection: the normal flow of cooling water is 120t / h. When the flow is lower than 96t / h, the unit will trip after a delay of 30s. The cooling water system uses condensed water and demineralized water for replenishment. The diameter of the replenishment pipe is DN25. It is equipped with a manual replenishment door and a flow meter. When the system consumes water normally and the water level in the water tank is low, the manual door is opened for replenishment. Due to the small designed pipe diameter, it is impossible to replenish water in time, which may cause the low flow of cooling water due to the low water level, causing the generator to trip. Therefore, it is very important to maintain the stability of the cooling water system. However, when the inlet pressure of the cooling water pump is insufficient, cavitation is prone to occur, resulting in insufficient cooling water flow. The pump inlet pressure is mainly determined by the water level of the high-level water tank. Therefore, it becomes necessary to control the stability of the water level of the high-level water tank and expand the volume of the water tank.
[0023] like Figure 2 and Figure 3As shown, the device for increasing the stability of the cold water system in this embodiment is applied to the above-mentioned original cold water system, including a newly added water tank 1, a newly added bottom connecting pipe 3, a newly added bottom isolating valve 4, a newly added top connecting pipe 5 and a newly added top isolating valve 6. The newly added water tank 1 is arranged on the side of the original high-position cold water tank 2 and is connected in parallel with the original high-position cold water tank 2. The installation position of the newly added water tank 1 is at the same height as the installation position of the original high-position cold water tank 2. The newly added bottom connecting pipe 3 connects the newly added water tank 1 with the bottom of the original high-position cold water tank 2; the newly added bottom isolating valve 4 is arranged on the newly added bottom connecting pipe 3. The newly added top connecting pipe 5 connects the newly added water tank 1 with the top of the original high-position cold water tank 2, and the newly added top isolating valve 6 is arranged on the newly added top connecting pipe 5.
[0024] Specifically, the capacity of the newly added water tank 1 is 1m 3 The newly added bottom connecting pipe 3 uses a DN65 pipe, the newly added top connecting pipe 5 uses a DN50 pipe, and the newly added bottom isolation valve 4 and the newly added top isolation valve 6 are both manual isolation valves. The newly added water tank 1 is at the same elevation as the original high-level cooling water tank 2. The total capacity of the two water tanks reaches 1 / 4 of the capacity of the cooling water system, which effectively solves the problem of small capacity and increases stability after expansion.
[0025] The device for increasing the stability of the constant cooling water system in this embodiment also includes a newly added water supply pipeline 7, which is connected to the newly added water tank 1 and is used to supply water to the newly added water tank 1. The water source is desalted water, which is taken from the desalted jellyfish pipe at the 0-meter layer of the machine room. The diameter of the newly added water supply pipeline 7 is DN32, and a newly added water supply solenoid valve 8 is provided on the newly added water supply pipeline 7. A newly added water supply front manual valve 9 and a newly added water supply rear manual valve 10 are also provided on the newly added water supply pipeline 7. The newly added water supply front manual valve 9 and the newly added water supply rear manual valve 10 are arranged on the front and rear sides of the newly added water supply solenoid valve 8.
[0026] The newly added water replenishment pipeline 7 for replenishing water in the newly added water tank 1 is equipped with a newly added water replenishment solenoid valve 8, a newly added water replenishment front manual valve 9, a newly added water replenishment rear manual valve 10, and a first newly added bypass pipeline 11 and a newly added bypass manual valve 12. When the water level in the newly added water tank 1 is low, the newly added water replenishment solenoid valve 8 automatically opens to replenish water, which is used for emergency water replenishment in case of system leakage, maintains a stable water level, and prevents water pump cavitation.
[0027] The device for increasing the stability of the cooling water system in this embodiment also includes a second newly added bypass pipeline 13, which is arranged at the manual door 14 of the downcomer of the original high-position cooling water tank 2, and a newly added bypass solenoid valve 15 is arranged on the second newly added bypass pipeline 13. The second newly added bypass pipeline 13 is DN25.
[0028] A second additional bypass pipeline 13 is added at the manual door 14 of the downcomer of the original high-position fixed cooling water tank 2, and a new bypass solenoid valve 15, a new bypass front manual valve 16, and a new bypass rear manual valve 17 are provided. When the pump outlet flow rate decreases or the generator inlet pressure decreases, the new bypass solenoid valve 15 will be automatically opened to increase the pump inlet pressure to prevent cavitation of the pump.
[0029] The device for increasing the stability of a cooling water system in this embodiment is suitable for modifying an existing cooling water system. Compared with replacing equipment on a large scale, it not only saves resources but also reduces costs, and is suitable for promotion.
[0030] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A device for increasing the stability of a constant cooling water system, characterized in that: include: A newly added water tank (1) is arranged on the side of the original high-position fixed cooling water tank (2) and is connected in parallel with the original high-position fixed cooling water tank (2), and its installation position is at the same height as that of the original high-position fixed cooling water tank (2); A new bottom connecting pipe (3) is added to connect the newly added water tank (1) with the bottom of the original high-position cooling water tank (2); A newly added bottom isolation valve (4) is arranged on the newly added bottom connecting pipe (3); A newly added top connecting pipe (5) is provided to connect the newly added water tank (1) with the top of the original high-position fixed cooling water tank (2); as well as A newly added top isolation valve (6) is arranged on the newly added top connecting pipe (5).
2. The device for increasing the stability of a cooling water system according to claim 1, characterized in that: It also comprises a newly added water replenishment pipeline (7), wherein the newly added water replenishment pipeline (7) is connected to the newly added water tank (1) and is used to replenish water for the newly added water tank (1), and a newly added water replenishment solenoid valve (8) is arranged on the newly added water replenishment pipeline (7).
3. The device for increasing the stability of a cooling water system according to claim 2, characterized in that: The newly added water supply pipeline (7) is also provided with a newly added water supply front manual valve (9) and a newly added water supply rear manual valve (10), and the newly added water supply front manual valve (9) and the newly added water supply rear manual valve (10) are arranged on the front and rear sides of the newly added water supply solenoid valve (8).
4. The device for increasing the stability of a cooling water system according to claim 3, characterized in that: The newly added water supply pipeline (7) is also provided with a first newly added bypass pipeline (11), and the first newly added bypass pipeline (11) is provided with a newly added bypass manual valve (12).
5. The device for increasing the stability of a cooling water system according to claim 4, characterized in that: It also includes a second newly added bypass pipeline (13), which is arranged at the manual door (14) of the downcomer of the original high-position fixed cold water tank (2), and a newly added bypass solenoid valve (15) is arranged on the second newly added bypass pipeline (13).
6. The device for increasing the stability of a cooling water system according to claim 5, characterized in that: The second newly added bypass pipeline (13) is also provided with a newly added bypass front manual valve (16) and a newly added bypass rear manual valve (17), and the newly added bypass front manual valve (16) and the newly added bypass rear manual valve (17) are arranged on the front and rear sides of the newly added bypass solenoid valve (15).
7. The device for increasing the stability of a cooling water system according to claim 1, characterized in that: The newly added bottom isolation valve (4) is a manual valve.
8. The device for increasing the stability of a cooling water system according to claim 1, characterized in that: The newly added top isolation valve (6) is a manual valve.