Hydropower station / pumped storage power station water supply system using existing branch hole sand sinking

Abstract

This invention provides a water supply system for a hydropower station / pumped storage power station that utilizes existing branch tunnel sedimentation, including a first water conveyance pipeline, a second water conveyance pipeline, a water intake channel, and a clear water well. The water intake channel has a first water intake pipe inlet and a second water intake pipe inlet symmetrically arranged on both sides near the water inlet end. By symmetrically arranging the water intake pipe inlets on both sides of the water intake end of the water intake channel, and with the two inlets facing each other, the relative water flow at the inlets is used to counteract and dissipate energy, thereby reducing the water flow velocity in the water intake channel from the tailrace diffuser section and improving the sedimentation effect of the water intake channel. Combined with the design of trash racks and the slope of the water intake channel, the sediment content of the water entering the clear water well can be effectively reduced, thus ensuring a safe and reliable water supply to the hydropower units and pumped storage power station units through the clear water well, guaranteeing the safe and reliable operation of the hydropower units and pumped storage power station units.

Description

Technical Field

[0001] This utility model relates to the field of water supply technology for hydropower stations and pumped storage power stations, specifically to a water supply system for hydropower stations / pumped storage power stations that utilizes existing branch tunnels for sediment deposition. Background Technology

[0002] With the booming development of new energy sources such as wind power and photovoltaics, and the integration of a large number of power electronic products, the volatility of new power systems has intensified. There is an urgent need for corresponding power sources to provide peak-shaving, frequency regulation, and phase regulation capabilities to ensure the safety and reliability of the entire power system. Hydropower units and pumped storage units, with their rapid response, flexible operation, and economic reliability, can provide regulation support for new power systems.

[0003] To ensure the normal operation of hydroelectric generating units and pumped storage units, a safe and reliable water supply system is required. Currently, the most common method for water supply systems of hydroelectric generating units and pumped storage power stations is to draw water from the tailrace and supply it to the generating units and transformers, as well as other equipment requiring cooling, through water supply pipelines.

[0004] The water source of the above-mentioned water supply system is a reservoir. Under normal circumstances, after sedimentation in the reservoir, the water supply requirements of hydropower units and pumped storage power station units can be met. However, if a large amount of sediment enters the reservoir during the flood season, the sedimentation effect of the reservoir is limited, and the sediment content of the water is high, which cannot meet the water supply requirements of hydropower units and pumped storage power station units, thus causing the units to be unable to operate.

[0005] Therefore, how to solve the problem of high sediment content in water bodies during flood season is a current challenge that needs to be addressed. Utility Model Content

[0006] In view of the shortcomings of the existing technology, this utility model provides a water supply system for hydropower stations / pumped storage power stations that utilizes existing adit sedimentation, which can effectively solve the above problems.

[0007] The technical solution adopted in this utility model is as follows:

[0008] This utility model provides a water supply system for a hydropower station / pumped storage power station that utilizes existing branch tunnel sedimentation, including a first water conveyance pipeline (2), a second water conveyance pipeline (3), a water intake channel (4), and a clear water well (5);

[0009] In the tailrace diffusion section (1) near the hydropower station / pumped storage power station, the water intake channel (4) is arranged. On both sides of the water intake channel (4) near the water inlet, a first water intake pipe inlet (4-1) and a second water intake pipe inlet (4-2) are symmetrically arranged. Upstream and downstream of the tailrace diffusion section (1), a first water intake (1-1) and a second water intake (1-2) are respectively set.

[0010] The inlet of the first water supply pipe (2) is connected to the first water intake (1-1), and the outlet is connected to the inlet of the first water intake pipe (4-1); the first water supply pipe (2) is equipped with a first working valve (2-1); the inlet of the second water supply pipe (3) is connected to the second water intake (1-2), and the outlet is connected to the inlet of the second water intake pipe (4-2); the second water supply pipe (3) is equipped with a second working valve (3-1);

[0011] The water intake channel (4) is equipped with the clean water well (5) at its outlet.

[0012] Preferably, the first water supply pipeline (2) is equipped with a first maintenance valve (2-2); the first maintenance valve (2-2) is located downstream of the first working valve (2-1); the second water supply pipeline (3) is equipped with a second maintenance valve (3-2); the second maintenance valve (3-2) is located downstream of the second working valve (3-1).

[0013] Preferably, the first water intake (1-1), the first water intake pipe inlet (4-1), the second water intake (1-2), the second water intake pipe inlet (4-2), and the water outlet of the water intake channel (4) are all equipped with a trash rack (6).

[0014] Preferably, the water intake channel (4) is located in the construction adit near the tailrace diffusion section (1) of the hydropower station / pumped storage power station.

[0015] Preferably, the water intake channel (4) is an open channel and winds around the construction adit.

[0016] Preferably, multiple first water intake pipe inlets (4-1) are arranged; multiple second water intake pipe inlets (4-2) are arranged symmetrically.

[0017] Preferably, the water intake channel (4) is equipped with a sand discharge device (7) and a sediment monitoring device (8).

[0018] Preferably, the clear water well (5) is equipped with lifting equipment, a first water level measuring device (9), a second water level measuring device (10), and a water level alarm device.

[0019] The water supply system for a hydroelectric power station / pumped storage power station that utilizes existing adit sedimentation tunnels provided by this utility model has the following advantages:

[0020] This utility model provides a water supply system for hydropower stations / pumped storage power stations that utilizes existing branch tunnels for sediment settling. Symmetrical water intake pipe inlets are set on both sides of the water intake channel, with the two inlets facing each other. The opposing water flow at the intake pipe inlets helps to dissipate energy, thereby reducing the water flow velocity in the tailrace diffuser section of the water intake channel and improving the sediment settling effect. Combined with the design of trash racks and the slope of the water intake channel, the sediment content of the water entering the clear water well can be effectively reduced, ensuring a safe and reliable water supply to the hydropower units and pumped storage power station units, thus guaranteeing their safe and reliable operation. Attached Figure Description

[0021] Figure 1 This utility model provides a structural diagram of a water supply system for a hydroelectric power station / pumped storage power station that utilizes existing branch tunnel sedimentation. Detailed Implementation

[0022] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0023] This utility model provides a water supply system for hydropower stations / pumped storage power stations that utilizes existing branch tunnels for sediment settling. Symmetrical water intake pipe inlets are set on both sides of the water intake channel, with the two inlets facing each other. The opposing water flow at the intake pipe inlets helps to dissipate energy, thereby reducing the water flow velocity in the tailrace diffuser section of the water intake channel and improving the sediment settling effect. Combined with the design of trash racks and the slope of the water intake channel, the sediment content of the water entering the clear water well can be effectively reduced, ensuring a safe and reliable water supply to the hydropower units and pumped storage power station units, thus guaranteeing their safe and reliable operation.

[0024] See Figure 1 This utility model provides a water supply system for a hydropower station / pumped storage power station that utilizes existing tributary sedimentation, including a first water transmission pipeline 2, a second water transmission pipeline 3, a water intake channel 4, and a clear water well 5;

[0025] In the tailrace diffusion section 1 near the hydropower station / pumped storage power station, the water intake channel 4 is arranged. On both sides of the water intake channel 4 near the water inlet, a first water intake pipe inlet 4-1 and a second water intake pipe inlet 4-2 are symmetrically arranged. Upstream and downstream of the tailrace diffusion section 1, a first water intake 1-1 and a second water intake 1-2 are respectively set.

[0026] The inlet of the first water supply pipe 2 is connected to the first water intake 1-1, and the outlet is connected to the inlet of the first water intake pipe 4-1; the first water supply pipe 2 is equipped with a first working valve 2-1; the inlet of the second water supply pipe 3 is connected to the second water intake 1-2, and the outlet is connected to the inlet of the second water intake pipe 4-2; the second water supply pipe 3 is equipped with a second working valve 3-1;

[0027] The water intake channel 4 has a clear water well 5 installed at its outlet. The clear water well 5 is equipped with lifting equipment, a first water level measuring device 9, a second water level measuring device 10, and a water level alarm device. The lifting equipment, such as a water pump, is used to pump water from the clear water well 5 to the water-using parts of the electromechanical equipment.

[0028] For ease of maintenance, the first water supply pipeline 2 is equipped with a first maintenance valve 2-2; the first maintenance valve 2-2 is located downstream of the first working valve 2-1; the second water supply pipeline 3 is equipped with a second maintenance valve 3-2; the second maintenance valve 3-2 is located downstream of the second working valve 3-1.

[0029] To further reduce the sediment content of the water, a debris barrier 6 is installed at the first water intake 1-1, the first water intake pipe inlet 4-1, the second water intake 1-2, the second water intake pipe inlet 4-2, and the outlet of the water intake channel 4.

[0030] Based on actual engineering needs and the layout characteristics of water intake channel 4, multiple first water intake pipe inlets 4-1 can be arranged; multiple second water intake pipe inlets 4-2 can be arranged symmetrically. Each first water intake pipe inlet 4-1 is connected to the tailwater diffusion section 1 through an independent first water supply pipe 2; similarly, each second water intake pipe inlet 4-2 is connected to the tailwater diffusion section 1 through an independent second water supply pipe 3.

[0031] This utility model provides a water supply system for a hydropower station / pumped storage power station that utilizes existing branch tunnel sedimentation for water supply. It is applied to a hydropower station / pumped storage power station where sediment-laden floodwaters may enter the reservoir. One method of use is as follows:

[0032] When a large amount of silt passes through the machine or flood carrying a large amount of silt enters the reservoir, there may be silt in the tailwater pipe. Using the device of this application, the upper layer of clear water in the tailwater pipe diffusion section 1 is filtered by the trash rack 6 and then flows into the water intake channel 4 through the first water supply pipe 2 and the second water supply pipe 3. After sedimentation in the water intake channel 4, it is filtered again by the trash rack 6 at the outlet of the water intake channel 4 and finally enters the clear water well 5. The water pump supplies the silt-free water in the clear water well 5 to the coolers of the mechanical and electrical equipment that need to be cooled.

[0033] Since the first water intake pipe inlet 4-1 and the second water intake pipe inlet 4-2 are symmetrically arranged on both sides of the water intake channel 4, when the first working valve 2-1 and the second working valve 3-1 are opened to take water, the two streams of water entering the water intake channel 4 collide with each other, which basically eliminates the kinetic energy of the water body caused by the potential energy of the lower reservoir water level, thereby reducing the water flow velocity in the water intake channel 4 and improving the sedimentation effect.

[0034] When either the first water intake pipe inlet 4-1 or the second water intake pipe inlet 4-2 becomes clogged, for example, if the first water intake pipe inlet 4-1 is clogged, the second working valve 3-1 on the other side is opened to flush the debris barrier 6 installed at the clogged side of the first water intake pipe inlet 4-1, thus maintaining the unobstructed flow of the water intake pipe inlet. Therefore, it has the advantage of easy cleaning of the water intake pipe inlet.

[0035] Each side of the water supply pipeline is equipped with a working valve and a maintenance valve. The working valve and maintenance valve are arranged according to the water flow direction. During normal operation, the working valve is used to control the water flow in the pipeline. However, if the working valve malfunctions or gets stuck, the maintenance valve on the same side can be closed in time for maintenance.

[0036] Furthermore, the opening and closing signals of the working valves originate from the water level measuring device within the clear water well 5. When the water level in the clear water well 5 is lower than a certain set value, each working valve is opened to supply water to the clear water well 5; when the water level in the clear water well 5 is higher than a certain set value, each working valve is closed. In this application, the working valves and maintenance valves can be operated hydraulically or electrically. For the safety of the valve operation signals, two water level measuring devices based on different principles can be installed within the clear water well 5, namely, the first water level measuring device 9 and the second water level measuring device 10.

[0037] In practical applications, the water intake channel 4 is located in the construction adit near the tailrace diffusion section 1 of the hydropower station / pumped storage power station. The water intake channel 4 is an open channel that winds within the construction adit. A sand removal device 7 and a sediment monitoring device 8 are installed in the water intake channel 4. The water intake channel 4 is used for water conveyance and slow sediment settling; therefore, the cross-sectional shape, size, and slope of the water intake channel 4 can be designed to allow the energy-dissipated water to flow slowly within it, achieving the purpose of sediment settling. The length of the water intake channel 4 can be adjusted within the construction adit depending on the sediment settling conditions of the water body, and the cross-sectional size can be enlarged at certain locations. Sand removal devices 7 and sediment monitoring devices 8 are installed at certain locations to monitor the sediment content in the water or remove accumulated sand from the channel.

[0038] The following is an example:

[0039] This utility model embodiment provides a water supply system for a hydropower station / pumped storage power station that utilizes existing branch tunnel sedimentation, mainly including: a water intake pipe inlet for flushing and dissipating energy and preventing siltation; a water intake channel in which silt can slowly settle, along with a silt monitoring device and a silt discharge device; a clear water well for unit cooling and related lifting equipment; and a working valve for the water delivery pipeline linked to the water level of the clear water well.

[0040] For the intake pipe inlet used for flushing and energy dissipation and preventing siltation, it is located in the tailrace diffusion section. A water delivery pipe extends from the upper side of the tailrace pipe cross-section, leading to a nearby construction adit. An open intake channel is set up within the adit, with two or more intake pipe inlets symmetrically arranged on both sides, directly flushing each other. Robust trash racks are installed at both the intake pipe inlets and the intake points in the tailrace diffusion section. In practical applications, several circular holes are made in the concrete wall of the tailrace diffusion section; short, straight water delivery pipes are connected behind these holes, leading directly to the intake channel within the construction adit. Trash racks or filters are installed at the circular holes in the tailrace diffusion section to initially filter larger impurities in the tailrace pipe. The water delivery pipes are symmetrically arranged on both sides of the intake channel, and a remotely controllable working valve is installed before the water delivery pipes enter the intake channel. Trash racks or filters are also installed at the intake pipe inlets within the intake channel.

[0041] For water intake channels, sediment monitoring devices, and sediment discharge devices, the construction adits located near the tailwater pipe of the plant are designed to make full use of the length of existing adits to reduce flow velocity and settle sediment. The cross-sectional dimensions of the water intake channels and the selection of installation locations for sediment monitoring devices and sediment discharge devices are determined based on the most favorable conditions for settlement and sediment discharge.

[0042] The layout of the clear water wells and related lifting equipment is determined based on the location of the construction adit and the water pressure and volume requirements of the water supply and usage equipment. Specifically, the effective volume of the clear water wells and the capacity of the lifting equipment should be sufficient to meet the water supply needs of the relevant units, and they should be located as close as possible to the main plant or near the water intake (or they can be located inside the construction adit) to save unnecessary excavation and energy consumption during operation.

[0043] The working valves of the water supply pipeline, linked to the water level of the clear water well, can automatically control their opening and closing based on the water level, ensuring that the cooling water drawn from the tailpipe meets the needs of the relevant water-using components. A maintenance and emergency backup valve is installed upstream of this valve. Specifically, the water supply pipeline can automatically open / close based on the water level of the clear water well, ensuring the safety of the plant and units. Working valves are installed on the water supply pipeline, allowing independent control of the water output from each side. The clear water well has at least two water level alarm devices to control the opening and closing of the working valves, and these valves can reliably close under various operating conditions.

[0044] This invention provides a water supply system for a hydroelectric / pumped storage power station that utilizes existing adits for sediment settling. Water intake channels for sediment settling are arranged in the construction adits near the powerhouse. Cooling water from various units flows slowly through these channels, allowing sediment to settle before being collected in clear water wells and pumped to the supply system. This application includes a safe and reliable control valve at the outlet location, linked to the clear water well level. The valve can be opened / closed as needed for unit operation, ensuring water safety for the units and the powerhouse. This application utilizes the relative water flow at the outlet for flushing and energy dissipation, combined with sediment settling in the construction adits and the valve at the outlet, to control the water supply.

[0045] This utility model, by changing the water supply and intake method of hydropower stations / pumped storage power stations, can maximize the savings in project investment and operating costs for hydropower stations / pumped storage power stations in rivers with high sediment loads or after flood peaks carry sediment into the reservoir, while ensuring the safety of cooling water supply for turbine generator units / pumped storage units, and making the most of idle construction adits to ensure the normal operation of the units.

[0046] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A water supply system for a hydroelectric power station / pumped storage power station utilizing existing adit sedimentation, characterized in that, It includes a first water transmission pipeline (2), a second water transmission pipeline (3), a water intake channel (4), and a clean water well (5); In the tailrace diffusion section (1) near the hydropower station / pumped storage power station, the water intake channel (4) is arranged. The water intake channel (4) is symmetrically arranged with a first water intake pipe inlet (4-1) and a second water intake pipe inlet (4-2) on both sides near the water inlet end. A first water intake (1-1) and a second water intake (1-2) are set up upstream and downstream of the tailrace diffusion section (1). The inlet end of the first water supply pipe (2) is connected to the first water intake (1-1), and the outlet end is connected to the inlet of the first water intake pipe (4-1); the first water supply pipe (2) is equipped with a first working valve (2-1); the inlet end of the second water supply pipe (3) is connected to the second water intake (1-2), and the outlet end is connected to the inlet of the second water intake pipe (4-2); the second water supply pipe (3) is equipped with a second working valve (3-1); The water intake channel (4) is equipped with the clean water well (5) at its outlet.

2. The water supply system for a hydroelectric power station / pumped storage power station utilizing existing adit sedimentation as described in claim 1, characterized in that, The first water supply pipeline (2) is equipped with a first maintenance valve (2-2); the first maintenance valve (2-2) is located downstream of the first working valve (2-1); the second water supply pipeline (3) is equipped with a second maintenance valve (3-2); the second maintenance valve (3-2) is located downstream of the second working valve (3-1).

3. A water supply system for a hydropower station / pumped storage power station utilizing existing adit sedimentation as described in claim 1, characterized in that, The first water intake (1-1), the first water intake pipe inlet (4-1), the second water intake (1-2), the second water intake pipe inlet (4-2), and the outlet of the water intake channel (4) are all equipped with trash racks (6).

4. A water supply system for a hydroelectric power station / pumped storage power station utilizing existing adit sedimentation as described in claim 1, characterized in that, The water intake channel (4) is located in the construction adit near the tailrace diffusion section (1) of the hydropower station / pumped storage power station.

5. A water supply system for a hydropower station / pumped storage power station utilizing sedimentation in an existing branch tunnel, as described in claim 4, is characterized in that... The water intake channel (4) is an open channel and winds around the construction adit.

6. A water supply system for a hydroelectric power station / pumped storage power station utilizing existing adit sedimentation as described in claim 1, characterized in that, Multiple first water intake pipe inlets (4-1) are arranged; multiple second water intake pipe inlets (4-2) are arranged symmetrically.

7. A water supply system for a hydroelectric power station / pumped storage power station utilizing existing adit sedimentation as described in claim 1, characterized in that, The water intake channel (4) is equipped with a sand discharge device (7) and a sediment monitoring device (8).

8. A water supply system for a hydroelectric power station / pumped storage power station utilizing sedimentation in an existing branch tunnel as described in claim 1, characterized in that, The well (5) is equipped with lifting equipment, a first water level measuring device (9), a second water level measuring device (10), and a water level alarm device.

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