A pumped storage power station water supply system adapted to a multi-silt condition

Abstract

The application discloses a water supply system of a pumped storage power station suitable for a multi-silt condition, and relates to the technical field of water conservancy and hydropower engineering, which comprises a pipeline assembly, a water pump assembly, a water filter, a valve assembly, a measurement control assembly, a flow channel cooler and a pressure equalization water supplement tank; wherein the normal working condition water pump water supply cooling branch is formed by the pipeline assembly, the valve assembly, the water filter, the water pump assembly and the measurement control assembly; the multi-silt working condition internal circulation water supply cooling branch is formed by the pipeline assembly, the valve assembly, the water pump assembly, the measurement control assembly, the flow channel cooler and the pressure equalization water supplement tank; and the normal working condition water pump water supply cooling branch and the multi-silt working condition internal circulation water supply cooling branch are arranged in parallel. Through real-time silt monitoring of the water delivery system of the pumped storage power station, the application realizes automatic control switching of the two working modes of normal and multi-silt, and is convenient, fast, safe and reliable to use.

Description

Technical Field

[0001] This invention relates to the field of hydropower and water conservancy engineering technology, specifically to a pumped storage power station water supply system adapted to conditions with high sediment content. Background Technology

[0002] The technical water supply system of a hydroelectric power station primarily provides cooling water for generator air coolers, unit bearing coolers, and water-cooled transformer coolers. Pumped storage power stations generally use pumps for their technical water supply, drawing water from the tailrace system, i.e., a single water source in the lower reservoir. During non-flood seasons, the units and their auxiliary systems operate safely and stably. However, during the flood season, for power stations with dammed reservoirs on natural rivers, the water quality in the flow channels deteriorates rapidly within a short period. When the units are operating under pumping conditions, the sediment content of the entire water conveyance system increases, leading to significant sediment accumulation in the unit's cooling water filters and pipes. This disrupts the safe operation of the technical water supply, ultimately forcing the units to shut down. Furthermore, after encountering conditions with high sediment levels, lengthy equipment dismantling, pipeline cleaning, and replacement of damaged components are required before the units can be put back into operation. Therefore, as the most important part of the safe and stable operation of the unit, the technical water supply system is currently not equipped with an automatic controllable emergency technical water supply system that is not affected by siltation in pumped storage power stations at home and abroad, nor is it equipped with a flow channel cooler as an internal circulation water supply system. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by providing a pumped storage power station water supply system adapted to conditions with high sediment content.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A pumped-storage power station water supply system adapted to conditions with high sediment load includes a pipeline assembly, a pump assembly, a filter, a valve assembly, a measurement and control assembly, a flow channel cooler, and a pressure equalization water supply tank. The pipeline assembly, valve assembly, filter, pump assembly, and measurement and control assembly constitute a normal operating condition pump water supply and cooling branch; the pipeline assembly, valve assembly, pump assembly, measurement and control assembly, flow channel cooler, and pressure equalization water supply tank constitute a high sediment load internal circulation water supply and cooling branch; and the normal operating condition pump water supply and cooling branch and the high sediment load internal circulation water supply and cooling branch are connected in parallel.

[0006] Based on the above technical solution, the valve assembly further includes a main water intake pipe maintenance valve, a water pump inlet working valve, a water pump outlet check valve, a water pump outlet working valve, a unit drain pipe check valve, a water pump supply and drainage pipe electric valve, a water pump supply and drainage pipe maintenance valve, an internal circulation water supply and drainage electric valve, a water replenishment electric valve, a water replenishment manual valve, and an isolation valve.

[0007] Based on the above technical solution, the water pump assembly further includes a water pump for supplying cooling water and an internal circulation water pump for supplying cooling water.

[0008] Based on the above technical solution, the measurement and control components further include a unit inlet water pipe thermometer, a unit outlet water pipe flow meter, a differential pressure signal device, a pressure gauge, a level transmitter, a level switch, and an online sediment monitoring instrument.

[0009] Based on the above technical solution, the pipeline assembly further includes a water pump supply and intake main pipe, a water pump supply and drainage pipe, an internal circulation water supply pipe, a water replenishment branch pipe, and a water tank replenishment pipe; wherein, the water pump supply and intake main pipe is equipped with a water intake main pipe maintenance valve, a water pump inlet working valve, a water filter, a water pump supply cooling water pump, a water pump outlet check valve, and a water pump outlet working valve.

[0010] Based on the above technical solution, it further includes a cooling water unit and a tailrace pipe. In normal operating mode, that is, when the water pump supply cooling branch is running under normal operating conditions, water is drawn from the water intake port of the water intake branch in front of the tailrace gate of the unit through the water pump supply intake main pipe. The water pump supply intake main pipe is equipped with a water intake main pipe maintenance valve, a water pump inlet working valve, a water filter, a water pump supply cooling water pump, a water pump outlet check valve, and a water pump outlet working valve. The drawn water flows sequentially through the water intake main pipe maintenance valve, the water pump inlet working valve, the water filter, the water pump supply cooling water pump, the water pump outlet check valve, and the water pump outlet working valve. After being supplied to the cooling water unit of the unit, the water is discharged back to the tailrace pipe of the unit through the unit drain pipe flow meter, the unit drain pipe check valve, the water pump supply drain pipe electric valve, the water pump supply drain pipe maintenance valve, and the water pump supply drain pipe.

[0011] Based on the above technical solution, further, in the multi-sediment working mode, that is, when the internal circulation water supply cooling branch is running under multi-sediment working conditions, it is a closed internal circulation branch. Each piece of equipment is connected through the internal circulation water supply pipe. The water taken out flows sequentially through the water pump inlet working valve, the internal circulation water supply cooling water pump, the water pump outlet check valve, and the water pump outlet working valve. After being supplied to the cooling water unit of the unit, it passes through the unit drain pipe flow meter, the unit drain pipe check valve, the internal circulation water supply drain electric valve, and the internal circulation water supply pipe to the flow channel cooler placed in the tailrace branch tunnel. After heat exchange, it re-enters the internal circulation water supply pipe.

[0012] Based on the above technical solution, the water pump supply and drainage pipe and the internal circulation water supply pipe are further equipped with electric valves to automatically control and switch between normal working mode and multi-mud working mode.

[0013] Based on the above technical solution, both the water pump supply cooling water pump and the internal circulation water supply cooling water pump are centrifugal pumps, and the centrifugal pumps are horizontal or vertical.

[0014] Based on the above technical solution, furthermore, when the pumped storage power station water supply system has multiple units, interconnecting water pipes and isolation valves are installed between the unit and adjacent units.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention presents a pumped-storage power station water supply system adapted to conditions with high sediment content. This system addresses the issue of rapidly increasing sediment concentration in the channel during the flood season, which could affect the cooling water supply to the generating units and force them to shut down. Furthermore, by monitoring the sediment content of the pumped-storage power station's water conveyance system in real time, it enables automatic switching between normal and high-sediment operating modes, offering convenient, fast, safe, and reliable operation. This significantly extends the effective service life of the power station units, reduces the frequency and duration of downtime for maintenance, plays a crucial role in safe production, and brings substantial economic benefits to the power station. It has broad guiding and promotional significance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system of the present invention;

[0018] Figure label:

[0019] 1. Main water supply and intake pipe for water pump; 2. Water supply and drainage pipe for water pump; 3. Internal circulation water supply pipe; 4. Makeup branch pipe; 5. Water tank makeup pipe; 6. Flow channel cooler; 7. Pressure equalization makeup tank; 8. Tailwater gate; 9. Cooling water unit; 10. Tailwater pipe; 11. Water intake port of intake branch pipe; 12. Water outlet port of outlet branch pipe; 13. Connecting water pipe; 14. Water filter; 15. Water supply cooling water pump for water pump; 16. Internal circulation water supply cooling water pump; 17. Makeup manual valve; 18. Isolation valve; 19. Water supply electric valve; 20. Internal circulation water supply and drainage electric valve; 21. Main water intake pipe maintenance valve; 22. Water pump inlet working valve; 23. Water pump outlet check valve; 24. Water pump outlet working valve; 25. Unit drain pipe check valve; 26. Water pump water supply and drainage pipe electric valve; 27. Water pump water supply and drainage pipe maintenance valve; 28. Unit inlet pipe thermometer; 29. ​​Unit drain pipe flow meter; 30. Differential pressure signal device; 31. Pressure gauge; 32. Level transmitter; 33. Level switch; 34. Sediment online monitoring instrument. Detailed Implementation

[0020] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. Technical features in the various embodiments of the present invention can be combined accordingly without mutual conflict.

[0022] In the description of this invention, it should be understood that when an element is considered to be "connected" to another element, it can be a direct connection to the other element or an indirect connection, i.e., there is an intermediate element. Conversely, when an element is said to be "directly" connected to another element, there is no intermediate element.

[0023] In the description of this invention, it should be understood that the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include at least one of those features.

[0024] Example

[0025] Combination Figure 1 As shown, this embodiment provides a pumped-storage power station water supply system adapted to conditions with high sediment loads. It includes two parallel power branches: the first is a normal operating water pump supply and cooling branch, and the second is a high sediment load internal circulation water supply and cooling branch. Specifically, the system includes piping components, pump components, a water filter 14, valve components, a measurement and control component, a flow channel cooler 6, a pressure equalization water supply tank 7, a tailrace gate 8, a cooling water unit 9, a tailrace pipe 10, a water intake 11, a water outlet 12, and connecting water pipes 13. The normal operating water pump supply and cooling branch consists of the piping components, valve components, water filter 14, pump components, and measurement and control component; the high sediment load internal circulation water supply and cooling branch consists of the piping components, valve components, pump components, measurement and control component, flow channel cooler 6, and pressure equalization water supply tank 7. This system has two parallel power branches that automatically switch according to the sediment content of the water conveyance system. When the online sediment monitoring instrument 34 detects a sediment content exceeding 0.5 kg / m³, the switching will occur. 3When the system is activated, an alarm signal will be issued, and the system will automatically enter a high-sedimentation operating mode. Each power branch's water pump assembly has two identical circuits connected in parallel, serving as backups for each other, ensuring the reliability of the cooling water supply system configuration. It should be noted that in this embodiment, "normal operating condition" refers to the working state of the equipment or system within its design range. Specifically, normal operating condition refers to the operating state of the equipment under conditions directly related to its operation. These conditions typically include parameters such as sediment content, pressure, temperature, and flow rate. These parameters need to be within the equipment's design range to ensure normal operation and efficient functioning. Furthermore, it should be noted that... Figure 1 The arrow in the image points in the direction of the water flow.

[0026] In some embodiments, the piping assembly includes a main water supply and intake pipe 1 for the water pump, a water supply and drainage pipe 2 for the water pump, an internal circulation water supply pipe 3, a water replenishment branch pipe 4, and a water tank replenishment pipe 5. The valve assembly includes a main water intake pipe maintenance valve 21, a water pump inlet working valve 22, a water pump outlet check valve 23, a water pump outlet working valve 24, a unit drainage pipe check valve 25, a water pump supply and drainage pipe electric valve 26, a water pump supply and drainage pipe maintenance valve 27, an internal circulation water supply and drainage electric valve 20, a water replenishment electric valve 19, a water replenishment manual valve 17, and an isolation valve 18. The water pump assembly includes a water pump supply cooling water pump 15 and an internal circulation water supply cooling water pump 16. In this system, both the water pump supply cooling water pump and the internal circulation water supply cooling water pump are centrifugal pumps, and at least four centrifugal pumps are installed. These centrifugal pumps can be horizontal or vertical. The measurement and control components include a unit inlet water pipe thermometer 28, a unit outlet water pipe flow meter 29, a differential pressure signal device 30, a pressure gauge 31, a level transmitter 32, a level switch 33, and an online sediment monitor 34. The water filter 14 in this system is an automatic backwash filter, with at least two units installed, and the number can be adjusted according to actual needs.

[0027] Specifically, when the water pump cooling branch is running under normal operating conditions, water is drawn from the intake port 11 of the intake branch pipe in front of the tailrace gate 8 of the unit through the water pump water supply intake main pipe 1. An online sediment monitoring instrument 34 is installed in front of the tailrace gate 8 to monitor the sediment content in the flow channel in real time. If the sediment content exceeds the set value, an alarm is automatically triggered and the system switches to a high sediment operating mode. The intake port 11 of the water pump water supply branch system is also located in front of the tailrace gate 8, and the outlet port 12 of the outlet branch pipe is located in the tailrace pipe 10 of the unit. The water pump water supply intake main pipe 1 is equipped with a main pipe maintenance valve 21 and a water pump... The system includes an inlet valve 22, a water filter 14, a water supply cooling water pump 15, a water pump outlet check valve 23, and a water pump outlet working valve 24. The extracted water flows sequentially through the main water intake pipe maintenance valve 21, the water pump inlet valve 22, the water filter 14, the water pump supply cooling water pump 15, the water pump outlet check valve 23, and the water pump outlet working valve 24, supplying water to the cooling water unit 9 of the unit. Afterward, the water is discharged back to the unit's tailwater pipe 10 through the unit's drain pipe flow meter 29, the unit's drain pipe check valve 25, the water pump supply drain pipe electric valve 26, the water pump supply drain pipe maintenance valve 27, and the water pump supply drain pipe 2. It should be noted that the number of the main water intake pipe maintenance valve 21, the water pump inlet valve 22, the water pump supply cooling water pump 15, the water pump outlet check valve 23, and the water pump outlet working valve 24 can be set according to actual needs. Specifically, under normal operating conditions, during the non-flood season of the pumped storage power station, the normal operating condition water pump supply cooling branch is used, the water pump supply cooling water pump 15 is turned on, the unit's technical water supply is drawn from the tailrace tunnel of the unit and enters the water filter 14, after filtration, it is pressurized and supplied to the unit's cooling water unit 9, and then discharged into the unit's tailrace pipe 10.

[0028] Furthermore, when the internal circulation cooling water supply branch is operating under conditions of high sediment content, it is a closed-loop internal circulation branch. All equipment is connected via the internal circulation water supply pipe 3. The extracted water flows sequentially through the water pump inlet valve 22, the internal circulation cooling water pump 16, the water pump outlet check valve 23, and the water pump outlet working valve 24, supplying water to the cooling water unit 9 of the unit. Afterward, it passes through the unit drain pipe flow meter 29, the unit drain pipe check valve 25, the internal circulation water supply drain electric valve 20, and the internal circulation water supply pipe 3, connecting to the flow channel cooler 6 located in the tailrace branch tunnel. After heat exchange, the water re-enters the internal circulation water supply pipe 3. This flow channel cooler 6 is a maintenance-free type and is integrated with the tailrace steel lining. This branch also has a parallel water supply branch pipe 4, which automatically replenishes water through the equalizing water supply tank 7. The replenishment volume is the amount of water lost within the system. The equalizing water supply tank 7 draws water from the power station's domestic water system. The water supply pipe 5 is equipped with an electric water supply valve 19 and a manual water supply valve 17. Specifically, in the multi-sediment operation mode, during the flood season of the pumped storage power station, sediment enters the reservoir, increasing the sediment concentration in the lower reservoir. When the online sediment monitoring instrument 34 issues an alarm signal, the emergency state is automatically activated. The internal circulation water supply cooling branch for multi-sediment operation is used, and the internal circulation water supply cooling water pump 16 is turned on to pressurize and supply the cooling water to the unit's cooling water unit 9. The water then enters the flow channel cooler 6 located in the tailrace tunnel, and after heat exchange in the cooler, it flows back to the internal circulation water supply pipe 3.

[0029] In this embodiment, an online sediment monitoring instrument 34 is installed in front of the tailrace gate 8 to monitor the sediment content in the flow channel in real time. An automatic alarm is triggered when the sediment content exceeds a set value. Electric valves are installed on the water pump supply and drainage pipe 2 and the internal circulation water supply pipe 3, allowing for automatic switching between normal operation mode and high sediment content operation mode. When the pumped storage power station's water supply system has multiple units, interconnecting water pipes 13 and isolation valves 18 are installed between the current unit and adjacent units, and interconnecting water pipes 13 and isolation valves 18 are installed between the current unit and the public water supply system to facilitate unit thermal efficiency testing and increase the reliability of the technical water supply system.

[0030] For example, the following description uses a large-scale pumped storage power station project that employs the present invention as an example for further illustration.

[0031] A large pumped-storage power station has floodwaters entering its lower reservoir. It has four generating units. Based on the water supply system structure, each unit has two parallel power branches, which can be automatically switched between normal operation and high sediment load operation. Taking Unit 1 as an example:

[0032] One of the branches is a normal operating water pump cooling branch, consisting of a water pump supply and intake main pipe 1, a water pump supply and drainage pipe 2, an intake main pipe maintenance valve 21, a water pump inlet working valve 22, a water pump outlet check valve 23, a water pump outlet working valve 24, a unit drainage pipe check valve 25, a water pump supply and drainage pipe electric valve 26, a water pump supply and drainage pipe maintenance valve 27, an isolation valve 18, a water filter 14, a water pump supply and cooling water pump 15, a unit inlet water pipe thermometer 28, a unit drainage pipe flow meter 29, a differential pressure signal device 30, and a pressure gauge 31. The extracted water flows within the water pump supply and intake main pipe 1, and the intake main pipe maintenance valve 21, water filter 14, water pump supply and cooling water pump 15, water pump outlet check valve 23, and water pump outlet working valve 24 are located on the water pump supply and intake main pipe 1.

[0033] The other branch is an internal circulation water supply cooling branch for multi-mud and sand conditions, consisting of an internal circulation water supply pipe 3, a water supply branch pipe 4, a water tank water supply pipe 5, a unit drain pipe check valve 25, an internal circulation water supply and drain electric valve 20, a water supply electric valve 19, a water supply manual valve 17, an internal circulation water supply cooling water pump 16, a unit inlet pipe thermometer 28, a unit drain pipe flow meter 29, a differential pressure signal device 30, a pressure gauge 31, a level transmitter 32 and a level switch 33, a flow channel cooler 6, and a pressure equalization water supply tank 7.

[0034] This system has two parallel power branches that automatically switch according to the sediment content of the water supply system. Each power branch is equipped with two identical circuits and four horizontal centrifugal pumps, which serve as backups for each other, ensuring the reliability of the cooling water supply system.

[0035] Under normal operating conditions, the water intake of the pump cooling branch line draws water from the tailrace gate 8 of Unit 1 through the main water intake pipe 1. The water flows sequentially through the maintenance valve 21 of the main water intake pipe, and then through the inlet valve 22 of pump #1 in the first branch line, the filter 14, the cooling water pump 15, the outlet check valve 23, and the outlet valve 24 of pump #1, or through the inlet valve 22 of pump #2 in the second branch line. Water is supplied to the cooling water unit 9 of Unit 1 via the No. 2 water filter 14, the No. 2 water pump cooling water pump 15, the No. 2 water pump outlet check valve 23, and the No. 2 water pump outlet working valve 24. After the water is supplied, it is discharged back to the tailwater pipe 10 of Unit 1 through the outlet branch pipe drain port 12 via the unit drain pipe flow meter 29, the unit drain pipe check valve 25, the water pump water supply and drain pipe electric valve 26, the water pump water supply and drain pipe maintenance valve 27, and the water pump water supply and drain pipe 2.

[0036] The internal circulation cooling water supply branch for the sediment-prone working conditions is a closed internal circulation branch. All equipment is connected through the internal circulation water supply pipe 3. Water is supplied from the first branch through the inlet working valve 22 of the No. 3 water pump, the No. 3 internal circulation cooling water pump 16, the No. 3 water pump outlet check valve 23, and the No. 3 water pump outlet working valve 24, or from the second branch through the inlet working valve 22 of the No. 4 water pump, the No. 4 internal circulation cooling water pump 16, the No. 4 water pump outlet check valve 23, and the No. 4 water pump outlet working valve 24, to the cooling water unit 9 of Unit 1. After that, the water is connected to the flow channel cooler 6 placed in the tailrace branch tunnel through the unit drain pipe flow meter 29, the unit drain pipe check valve 25, the internal circulation water supply drain electric valve 20, and the internal circulation water supply pipe 3. After heat exchange, the water re-enters the internal circulation water supply pipe 3. This branch line is also connected in parallel to a water supply branch pipe 4, which is automatically replenished by a pressure equalization water supply tank. The replenishment volume is the amount of water lost within the system. The pressure equalization water supply tank 7 draws water from the power station's domestic water system. The water supply pipe 5 of the tank is equipped with a water supply electric valve 19 and a water supply manual valve 17.

[0037] This water supply system has two operating modes: During the non-flood season, the pumped storage power station operates under normal long-term conditions. The cooling water supply branch is used by starting either pump #1 or pump #2. Technical water supply to the unit is drawn from the tailrace tunnel of Unit 1 and enters either filter #1 or filter #2. Filter #14 is an automatic backwash filter with a filtration accuracy of 0.5mm. After filtration, the water is pressurized and supplied to the cooling water unit 9 of Unit 1, and then discharged into the tailrace pipe 10 of Unit 1.

[0038] During the flood season, pumped-storage power stations experience increased sediment inflow into the reservoir, leading to a rise in sediment levels in the lower reservoir. When the online sediment monitoring instrument (34) detects a sediment content exceeding 0.5 kg / m³ in the waterway system... 3 When the alarm signal is triggered, the emergency state is automatically activated. Using the internal circulation cooling water supply branch, either pump #3 or pump #4 is turned on to pressurize and supply water to the cooling water unit 9 of Unit 1. The water then enters the flow channel cooler 6 located in the tailrace tunnel, and after heat exchange in the cooler, flows back to the internal circulation supply pipe 3. The cooler is a maintenance-free type and is integrated with the tailrace steel lining.

[0039] A connecting water pipe 13 and an isolation valve 18 are installed between Unit 1 and Unit 2 for mutual drainage, and a connecting water pipe 13 and an isolation valve 18 are installed between Unit 1 and the public water supply system for mutual access, in order to facilitate unit thermal efficiency tests and increase the reliability of the technical water supply system.

[0040] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A pumped storage power plant water supply system adapted to a multi-silt condition, characterized by, The pipeline assembly, the water pump assembly, the water filter, the valve assembly, the measurement control assembly, the flow channel cooler and the equalizing water supplement tank are included. The normal working condition water pump water supply cooling branch circuit is formed by the pipeline assembly, the valve assembly, the water filter, the water pump assembly and the measurement control assembly. The multi-silt working condition internal circulation water supply cooling branch circuit is formed by the pipeline assembly, the valve assembly, the water pump assembly, the measurement control assembly, the flow channel cooler and the equalizing water supplement tank. The normal working condition water pump water supply cooling branch circuit and the multi-silt working condition internal circulation water supply cooling branch circuit are connected in parallel. The measurement control assembly includes the unit inlet pipe thermometer, the unit outlet pipe flowmeter, the pressure difference signaler, the pressure gauge, the liquid level transmitter, the liquid level switch and the silt online monitor.

2. The pumped storage power plant water supply system adapted to a multi-silt condition according to claim 1, characterized in that, The valve assembly includes the water intake main pipe maintenance valve, the water pump inlet working valve, the water pump outlet check valve, the water pump outlet working valve, the unit outlet pipe check valve, the water pump water supply and drainage pipe electric valve, the water pump water supply and drainage pipe maintenance valve, the internal circulation water supply and drainage electric valve, the water supplement electric valve, the water supplement manual valve and the isolation valve.

3. The water supply system for pumped storage power station adapted to multi-sediment conditions according to claim 2, characterized in that, The water pump assembly includes the water pump water supply cooling water pump and the internal circulation water supply cooling water pump.

4. The pumped storage power plant water supply system adapted to a multi-silt condition according to claim 3, characterized in that, The pipeline assembly includes the water pump water supply water intake main pipe, the water pump water supply and drainage pipe, the internal circulation water supply pipe, the water supplement branch pipe and the water tank water supplement pipe.

5. The pumped storage power plant water supply system adapted to a multi-sediment condition according to claim 4, characterized in that, The cooling water unit and the tail water pipe are further included. In the normal working mode, that is, when the normal working condition water pump water supply cooling branch circuit is running, water is taken from the water intake branch pipe in front of the tail water gate of the unit through the water pump water supply water intake main pipe, wherein the water pump water supply water intake main pipe is provided with the water intake main pipe maintenance valve, the water pump inlet working valve, the water filter, the water pump water supply cooling water pump, the water pump outlet check valve and the water pump outlet working valve. The taken water flows through the water intake main pipe maintenance valve, the water pump inlet working valve, the water filter, the water pump water supply cooling water pump, the water pump outlet check valve and the water pump outlet working valve in sequence, is supplied to the cooling water unit of the unit, and is discharged to the tail water pipe of the unit through the unit outlet pipe flowmeter, the unit outlet pipe check valve, the water pump water supply and drainage pipe electric valve, the water pump water supply and drainage pipe maintenance valve and the water pump water supply and drainage pipe.

6. The pumped storage power plant water supply system adapted to a multi-silt condition according to claim 5, wherein In the multi-silt working mode, that is, when the multi-silt working condition internal circulation water supply cooling branch is running, it is a closed internal circulation branch, each device is connected through the internal circulation water supply pipe, the water taken out flows through the water pump inlet working valve, the internal circulation water supply cooling water pump, the water pump outlet check valve and the water pump outlet working valve in turn, is supplied to the cooling water unit of the machine set, and then flows through the machine set drainage pipe flow meter, the machine set drainage pipe check valve, the internal circulation water supply drainage electric valve and the flow channel cooler placed in the tail water branch hole through the internal circulation water supply pipe, and enters the internal circulation water supply pipe again after heat exchange.

7. The water supply system for pumped storage power station adapted to multi-sediment conditions according to claim 3, wherein, The water pump water supply cooling water pump and the internal circulation water supply cooling water pump are both centrifugal pumps, and the centrifugal pumps are horizontal or vertical.

8. The pumped storage power plant water supply system adapted to multiple sediment conditions according to claim 2, wherein, When the water supply system of the pumped storage power station is provided with multiple machine sets, a mutual drainage connecting water pipe and an isolation valve are arranged between the machine set and the adjacent machine set.

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