Arrangement structure of water delivery system of pumped storage power station

Abstract

The utility model belongs to the technical field of pumped storage power stations, and particularly relates to a water delivery system arrangement structure of a pumped storage power station. The device comprises an upper reservoir water inlet / outlet, a water diversion system, a generator set, a tail water system and a lower reservoir water inlet / outlet which are sequentially connected, the water diversion system comprises a water diversion main hole, the upstream end of the water diversion main hole is connected with the upper reservoir water inlet / outlet, and an impedance type surge chamber is arranged at the downstream end of the water diversion main hole and comprises a surge well and an impedance hole. A bottom plate of the surge shaft is connected with a top arch of the water diversion main hole through an impedance hole, a diversion guide wall is arranged at the position, on the downstream side of the impedance hole, of the middle of the water diversion main hole in the width direction, a hole A and a hole B which are independently formed are formed in the two sides of the diversion guide wall, the hole A is provided with a bulkhead gate A, and the hole B is provided with a bulkhead gate B; and the bulkhead gate A and the bulkhead gate B are provided with independently controlled hoists. According to the utility model, the flexibility of operation and maintenance can be maintained while investment is saved.

Description

Technical Field

[0001] This utility model belongs to the technical field of pumped storage power stations, specifically relating to a water conveyance system layout structure for a pumped storage power station. Background Technology

[0002] In its design, a pumped-storage power station typically includes, in sequence, an upper reservoir inlet and outlet, a water diversion system, generator units, a tailrace system, and a lower reservoir inlet and outlet. The generator units are housed in an underground powerhouse. When water is released from the upper reservoir to the lower reservoir, the turbines generate electricity, and simultaneously pump water from the lower reservoir back to the upper reservoir for energy storage. Multiple generator units are usually housed in the same underground powerhouse; for example, three generator units are commonly arranged in parallel. The corresponding water conveyance system has two typical arrangements:

[0003] The first type adopts a one-tunnel-one-machine layout, where each generator unit is directly connected to the inlet and outlet of the upper reservoir through an independently set water diversion tunnel. This eliminates the need for branch pipes, resulting in higher investment costs, but also greater flexibility in operation and maintenance.

[0004] The second approach employs a "one tunnel, three generators" layout. A main water intake tunnel draws water from the upper reservoir or surge chamber, and near the power plant, it branches into three branch pipes, each connecting to one of the three generator units. For high-head pumped storage power stations, to meet HD (high head) requirements, a first-stage bifurcated pipe can be installed in the middle horizontal section of the two-stage inclined (or vertical) shafts, dividing into two first-stage branch pipes. One of these first-stage branch pipes then branches into two second-stage branch pipes in the lower horizontal section, supplying water to the three generator units respectively. While this scheme saves investment, if the main water intake tunnel or the bifurcated pipe fails, all three generator units must shut down, reducing the power station's availability and flexibility (the water intake system can only have a single emergency gate, leading to a "one-stop-shop" situation). Utility Model Content

[0005] The purpose of this utility model is to provide a water conveyance system layout structure for a pumped storage power station that can save investment while maintaining the flexibility of operation and maintenance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pumped storage power station water conveyance system layout structure, including an upper reservoir inlet / outlet, a water diversion system, a generator set, a tailrace system, and a lower reservoir inlet / outlet connected in sequence. The water diversion system includes a main water diversion tunnel, the upstream end of which is connected to the upper reservoir inlet / outlet. An impedance-type surge tank is installed at the downstream end of the main water diversion tunnel. The impedance-type surge tank includes a surge well and an impedance orifice. The bottom plate of the surge well is connected to the top arch of the main water diversion tunnel through the impedance orifice. A diversion guide wall is installed at the midpoint of the width direction of the main water diversion tunnel, downstream of the impedance orifice. Independently set A-holes and B-holes are formed on both sides of the diversion guide wall. All tunnels are connected to the downstream end of the main water diversion tunnel. The downstream end of tunnel A is connected to the first pressure branch pipe, and the downstream end of tunnel B is connected to the second and third pressure branch pipes through the first Y-shaped branch pipe. The downstream ends of the first, second, and third pressure branch pipes are respectively connected to the generator sets. The impedance-type surge tank has a gate well A at the upstream end of tunnel A and a gate well B at the upstream end of tunnel B. A maintenance gate A is installed in gate well A to control the opening and closing of the flow channel of tunnel A, and a maintenance gate B is installed in gate well B to control the opening and closing of the flow channel of tunnel B. Maintenance gates A and B are equipped with independently controlled hoists.

[0007] A further preferred option is that one side of gate well A and the diversion guide wall are set as an integral structure, and one side of gate well B and the diversion guide wall are set as an integral structure.

[0008] A further preferred embodiment is: gate well A has a gate slot A that is compatible with maintenance gate A, gate well B has a gate slot B that is compatible with maintenance gate B, and stainless steel plates are fixedly attached to the inner walls of gate slot A and gate slot B respectively.

[0009] A further preferred embodiment is as follows: the tailrace system includes a tailrace main tunnel and three tailrace branch pipes. The tailrace branch pipes are connected to the downstream end of the generator set and correspond one-to-one with the first pressure branch pipe, the second pressure branch pipe and the third pressure branch pipe. Two adjacent tailrace branch pipes are connected to the tailrace main pipe at their downstream ends through a second Y-shaped branch pipe. The downstream end of the other tailrace branch pipe and the downstream end of the tailrace main pipe are connected to the upstream end of the tailrace main tunnel through a third Y-shaped branch pipe. The downstream end of the tailrace main tunnel is connected to the inlet and outlet of the lower reservoir.

[0010] Compared with existing technologies, the beneficial effects of this utility model are as follows: A main water diversion tunnel connects to the upper reservoir. An impedance-type surge tank is installed at the end of the main water diversion tunnel. The surge tank integrates a tunnel diversion structure and two independently installed emergency gate structures, forming independently controllable tunnels A and B. Tunnels A and B, as well as their corresponding generator sets, can be maintained independently. This utility model saves investment while maintaining operational and maintenance flexibility, and improves generator set utilization. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall plan layout of this utility model;

[0012] Figure 2 This is a schematic diagram of the plan layout of the impedance-type voltage regulating chamber area of ​​this utility model;

[0013] Figure 3 for Figure 2 DD facade structural diagram;

[0014] Figure 4 for Figure 2 Schematic diagram of the EE facade structure.

[0015] The components in the diagram are marked as follows: 1-Upper Reservoir; 2-Upper Reservoir Inlet / Outlet; 3-Main Water Diversion Tunnel; 4-Impedance-type Surge Chamber; 41-Surge Well; 42-Impedance Hole; 43-Diversion Guide Wall; 5-Gate Well A; 6-A Tunnel; 7-First Pressure Branch Pipe; 8-Gate Well B; 9-B Tunnel; 10-First Y-type Branch Pipe; 11-Second Pressure Branch Pipe; 12-Third Pressure Branch Pipe; 13-Generator Set; 14-Tailwater Main Tunnel; 15-Lower Reservoir Inlet / Outlet; 16-Lower Reservoir; 17-Tailwater Branch Pipe; 18-Second Y-type Branch Pipe; 19-Third Y-type Branch Pipe. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1 to 4This utility model includes, in sequence, an upper reservoir inlet / outlet 2, a water diversion system, a generator set 13, a tailrace system, and a lower reservoir inlet / outlet 15. The water diversion system includes a main water diversion tunnel 3, the upstream end of which is connected to the upper reservoir inlet / outlet 2. An impedance-type surge chamber 4 is installed at the downstream end of the main water diversion tunnel 3. The impedance-type surge chamber 4 includes a surge well 41 and an impedance hole 42. The bottom plate of the surge well 41 is connected to the top arch of the main water diversion tunnel 3 through the impedance hole 42. A diversion guide wall 43 (preferably with a V-shaped diversion structure with rounded corners) is installed at the middle position of the main water diversion tunnel 3 in the width direction, downstream of the impedance hole 42. Independently arranged A-hole 6 and B-hole 9 are formed on both sides of the diversion guide wall 43. Both A-hole 6 and B-hole 9 are connected to the downstream end of the main water diversion tunnel 3. A-hole 6... The downstream end is connected to the first pressure branch pipe 7. The downstream end of tunnel B 9 is connected to the second pressure branch pipe 11 and the third pressure branch pipe 12 through the first Y-shaped branch pipe 10. The downstream ends of the first pressure branch pipe 7, the second pressure branch pipe 11, and the third pressure branch pipe 12 are respectively connected to the generator set 13. The impedance-type voltage regulating chamber 4 is provided with a gate well A5 at the upstream end of tunnel A 6 and a gate well B8 at the upstream end of tunnel B 9. The gate well A5 is provided with a maintenance gate A for controlling the opening and closing of the flow channel of tunnel A 6. The gate well B8 is provided with a maintenance gate B for controlling the opening and closing of the flow channel of tunnel B 9. The maintenance gate A and the maintenance gate B are equipped with independently controlled hoists (that is, the maintenance gate A and the maintenance gate B can be independently controlled to open and close). The hoists can generally be hydraulic hoists.

[0018] The three generator units are numbered 1#, 2#, and 3# respectively. During operation of the hydropower station, the main operating conditions include the following:

[0019] Normal operating conditions: Maintenance gates A and B are fully open, and all three generating units are operating at full load;

[0020] Maintenance conditions: When maintenance is being carried out in tunnel A6, maintenance gate A is closed (cutting off tunnel A6), and tunnel B9 supplies generator sets #2 and #3;

[0021] During maintenance of tunnel B9, maintenance gate B is closed (cutting off tunnel B9), and tunnel A6 supplies generator set #1.

[0022] When the No. 1 generator unit is under maintenance, the maintenance gate A is closed (cutting off tunnel A 6), and tunnel B 9 supplies power to the No. 2 / 3 generator units; or the maintenance gates A and B are kept fully open, and isolation is achieved by closing the ball valve in front of the turbine casing.

[0023] During the maintenance of generator sets #2 / #3, the maintenance gate B is closed (cutting off tunnel B 9), and tunnel A 6 supplies power to generator set #1. Alternatively, maintenance gates A and B can be kept fully open, and isolation can be achieved by closing the ball valve in front of the turbine casing.

[0024] This invention can save investment while maintaining the flexibility of operation and maintenance, and improve the utilization rate of generator sets.

[0025] To further reduce investment in civil engineering, one side of gate well A5 and one side of gate well B8 are integrated with the diversion guide wall 43. This means that a portion of the gate slots corresponding to maintenance gates A and B can be directly arranged on the side of the diversion guide wall 43.

[0026] To improve structural reliability, gate well A5 has a gate slot A that is compatible with maintenance gate A, and gate well B8 has a gate slot B that is compatible with maintenance gate B. Stainless steel plates are fixedly attached to the inner walls of gate slot A and gate slot B respectively to resist cavitation.

[0027] To simplify the tunnel structure of the tailrace system and further save on engineering investment, in a preferred embodiment, the tailrace system includes a tailrace main tunnel 14 and three tailrace branch pipes 17. The tailrace branch pipes are connected to the downstream end of the generator set 13 and correspond one-to-one with the first pressure branch pipe 7, the second pressure branch pipe 11 and the third pressure branch pipe 12. Two adjacent tailrace branch pipes 17 are connected to the tailrace main pipe at their downstream ends through a second Y-shaped branch pipe 18. The downstream end of the other tailrace branch pipe 17 and the downstream end of the tailrace main pipe are connected to the upstream end of the tailrace main tunnel 14 through a third Y-shaped branch pipe 19. The downstream end of the tailrace main tunnel 14 is connected to the inlet and outlet of the lower reservoir 15.

Claims

1. A pumped storage power station water conveyance system layout structure, comprising, in sequence, an upper reservoir inlet / outlet (2), a water diversion system, a generator set (13), a tailrace system, and a lower reservoir inlet / outlet (15), wherein the water diversion system comprises a main water diversion tunnel (3), the upstream end of which is connected to the upper reservoir inlet / outlet (2), characterized in that: A pressure regulating chamber (4) is provided at the downstream end of the main water diversion tunnel (3). The pressure regulating chamber (4) includes a pressure regulating well (41) and an impedance hole (42). The bottom plate of the pressure regulating well (41) is connected to the top arch of the main water diversion tunnel (3) through the impedance hole (42). A diversion guide wall (43) is provided at the middle position of the main water diversion tunnel (3) in the width direction, downstream of the impedance hole (42). Independent A holes (6) and B holes (9) are formed on both sides of the diversion guide wall (43). Both A holes (6) and B holes (9) are connected to the downstream end of the main water diversion tunnel (3). The downstream end of A hole (6) is connected to a first pressure branch pipe (7). The downstream end of B hole (9) is connected to a first Y-shaped branch pipe (7). 10) Connected to the second pressure branch pipe (11) and the third pressure branch pipe (12), the downstream end of the first pressure branch pipe (7), the downstream end of the second pressure branch pipe (11) and the downstream end of the third pressure branch pipe (12) are respectively connected to the generator set (13); the impedance type voltage regulating chamber (4) is provided with a gate well A (5) at the upstream end of tunnel A (6) and a gate well B (8) at the upstream end of tunnel B (9). A maintenance gate A for controlling the opening and closing of the flow channel of tunnel A (6) is provided in gate well A (5), and a maintenance gate B for controlling the opening and closing of the flow channel of tunnel B (9) is provided in gate well B (8). The maintenance gate A and the maintenance gate B are equipped with independently controlled hoists.

2. The pumped storage power plant water delivery system arrangement of claim 1, wherein: One side of gate well A (5) and the diversion guide wall (43) are set as an integral structure, and one side of gate well B (8) and the diversion guide wall (43) are set as an integral structure.

3. The pumped storage power plant water delivery system arrangement of claim 1, wherein: Gate well A (5) has a gate slot A that is compatible with maintenance gate A, and gate well B (8) has a gate slot B that is compatible with maintenance gate B. The inner walls of gate slot A and gate slot B are respectively fixedly fitted with stainless steel plates.

4. Pumped storage power plant water conveyance system arrangement according to any one of claims 1 to 3, characterized in that: The tailrace system includes a tailrace main tunnel (14) and three tailrace branch pipes (17). The tailrace branch pipes are connected to the downstream end of the generator set (13) and correspond one-to-one with the first pressure branch pipe (7), the second pressure branch pipe (11) and the third pressure branch pipe (12). Two of the adjacent tailrace branch pipes (17) are connected to the tailrace main pipe through a second Y-shaped branch pipe (18) at their downstream ends. The downstream end of the other tailrace branch pipe (17) and the downstream end of the tailrace main pipe are connected to the upstream end of the tailrace main tunnel (14) through a third Y-shaped branch pipe (19). The downstream end of the tailrace main tunnel (14) is connected to the inlet and outlet of the lower reservoir (15).

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